1 /* Xtensa-specific support for 32-bit ELF.
2 Copyright 2003, 2004, 2005, 2006, 2007 Free Software Foundation, Inc.
4 This file is part of BFD, the Binary File Descriptor library.
6 This program is free software; you can redistribute it and/or
7 modify it under the terms of the GNU General Public License as
8 published by the Free Software Foundation; either version 3 of the
9 License, or (at your option) any later version.
11 This program is distributed in the hope that it will be useful, but
12 WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with this program; if not, write to the Free Software
18 Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, MA
30 #include "elf/xtensa.h"
31 #include "xtensa-isa.h"
32 #include "xtensa-config.h"
34 #define XTENSA_NO_NOP_REMOVAL 0
36 /* Local helper functions. */
38 static bfd_boolean
add_extra_plt_sections (struct bfd_link_info
*, int);
39 static char *vsprint_msg (const char *, const char *, int, ...) ATTRIBUTE_PRINTF(2,4);
40 static bfd_reloc_status_type bfd_elf_xtensa_reloc
41 (bfd
*, arelent
*, asymbol
*, void *, asection
*, bfd
*, char **);
42 static bfd_boolean do_fix_for_relocatable_link
43 (Elf_Internal_Rela
*, bfd
*, asection
*, bfd_byte
*);
44 static void do_fix_for_final_link
45 (Elf_Internal_Rela
*, bfd
*, asection
*, bfd_byte
*, bfd_vma
*);
47 /* Local functions to handle Xtensa configurability. */
49 static bfd_boolean
is_indirect_call_opcode (xtensa_opcode
);
50 static bfd_boolean
is_direct_call_opcode (xtensa_opcode
);
51 static bfd_boolean
is_windowed_call_opcode (xtensa_opcode
);
52 static xtensa_opcode
get_const16_opcode (void);
53 static xtensa_opcode
get_l32r_opcode (void);
54 static bfd_vma
l32r_offset (bfd_vma
, bfd_vma
);
55 static int get_relocation_opnd (xtensa_opcode
, int);
56 static int get_relocation_slot (int);
57 static xtensa_opcode get_relocation_opcode
58 (bfd
*, asection
*, bfd_byte
*, Elf_Internal_Rela
*);
59 static bfd_boolean is_l32r_relocation
60 (bfd
*, asection
*, bfd_byte
*, Elf_Internal_Rela
*);
61 static bfd_boolean
is_alt_relocation (int);
62 static bfd_boolean
is_operand_relocation (int);
63 static bfd_size_type insn_decode_len
64 (bfd_byte
*, bfd_size_type
, bfd_size_type
);
65 static xtensa_opcode insn_decode_opcode
66 (bfd_byte
*, bfd_size_type
, bfd_size_type
, int);
67 static bfd_boolean check_branch_target_aligned
68 (bfd_byte
*, bfd_size_type
, bfd_vma
, bfd_vma
);
69 static bfd_boolean check_loop_aligned
70 (bfd_byte
*, bfd_size_type
, bfd_vma
, bfd_vma
);
71 static bfd_boolean
check_branch_target_aligned_address (bfd_vma
, int);
72 static bfd_size_type get_asm_simplify_size
73 (bfd_byte
*, bfd_size_type
, bfd_size_type
);
75 /* Functions for link-time code simplifications. */
77 static bfd_reloc_status_type elf_xtensa_do_asm_simplify
78 (bfd_byte
*, bfd_vma
, bfd_vma
, char **);
79 static bfd_reloc_status_type contract_asm_expansion
80 (bfd_byte
*, bfd_vma
, Elf_Internal_Rela
*, char **);
81 static xtensa_opcode
swap_callx_for_call_opcode (xtensa_opcode
);
82 static xtensa_opcode
get_expanded_call_opcode (bfd_byte
*, int, bfd_boolean
*);
84 /* Access to internal relocations, section contents and symbols. */
86 static Elf_Internal_Rela
*retrieve_internal_relocs
87 (bfd
*, asection
*, bfd_boolean
);
88 static void pin_internal_relocs (asection
*, Elf_Internal_Rela
*);
89 static void release_internal_relocs (asection
*, Elf_Internal_Rela
*);
90 static bfd_byte
*retrieve_contents (bfd
*, asection
*, bfd_boolean
);
91 static void pin_contents (asection
*, bfd_byte
*);
92 static void release_contents (asection
*, bfd_byte
*);
93 static Elf_Internal_Sym
*retrieve_local_syms (bfd
*);
95 /* Miscellaneous utility functions. */
97 static asection
*elf_xtensa_get_plt_section (struct bfd_link_info
*, int);
98 static asection
*elf_xtensa_get_gotplt_section (struct bfd_link_info
*, int);
99 static asection
*get_elf_r_symndx_section (bfd
*, unsigned long);
100 static struct elf_link_hash_entry
*get_elf_r_symndx_hash_entry
101 (bfd
*, unsigned long);
102 static bfd_vma
get_elf_r_symndx_offset (bfd
*, unsigned long);
103 static bfd_boolean
is_reloc_sym_weak (bfd
*, Elf_Internal_Rela
*);
104 static bfd_boolean
pcrel_reloc_fits (xtensa_opcode
, int, bfd_vma
, bfd_vma
);
105 static bfd_boolean
xtensa_is_property_section (asection
*);
106 static bfd_boolean
xtensa_is_insntable_section (asection
*);
107 static bfd_boolean
xtensa_is_littable_section (asection
*);
108 static bfd_boolean
xtensa_is_proptable_section (asection
*);
109 static int internal_reloc_compare (const void *, const void *);
110 static int internal_reloc_matches (const void *, const void *);
111 extern asection
*xtensa_get_property_section (asection
*, const char *);
112 static flagword
xtensa_get_property_predef_flags (asection
*);
114 /* Other functions called directly by the linker. */
116 typedef void (*deps_callback_t
)
117 (asection
*, bfd_vma
, asection
*, bfd_vma
, void *);
118 extern bfd_boolean xtensa_callback_required_dependence
119 (bfd
*, asection
*, struct bfd_link_info
*, deps_callback_t
, void *);
122 /* Globally visible flag for choosing size optimization of NOP removal
123 instead of branch-target-aware minimization for NOP removal.
124 When nonzero, narrow all instructions and remove all NOPs possible
125 around longcall expansions. */
127 int elf32xtensa_size_opt
;
130 /* The "new_section_hook" is used to set up a per-section
131 "xtensa_relax_info" data structure with additional information used
132 during relaxation. */
134 typedef struct xtensa_relax_info_struct xtensa_relax_info
;
137 /* The GNU tools do not easily allow extending interfaces to pass around
138 the pointer to the Xtensa ISA information, so instead we add a global
139 variable here (in BFD) that can be used by any of the tools that need
142 xtensa_isa xtensa_default_isa
;
145 /* When this is true, relocations may have been modified to refer to
146 symbols from other input files. The per-section list of "fix"
147 records needs to be checked when resolving relocations. */
149 static bfd_boolean relaxing_section
= FALSE
;
151 /* When this is true, during final links, literals that cannot be
152 coalesced and their relocations may be moved to other sections. */
154 int elf32xtensa_no_literal_movement
= 1;
157 static reloc_howto_type elf_howto_table
[] =
159 HOWTO (R_XTENSA_NONE
, 0, 0, 0, FALSE
, 0, complain_overflow_dont
,
160 bfd_elf_xtensa_reloc
, "R_XTENSA_NONE",
162 HOWTO (R_XTENSA_32
, 0, 2, 32, FALSE
, 0, complain_overflow_bitfield
,
163 bfd_elf_xtensa_reloc
, "R_XTENSA_32",
164 TRUE
, 0xffffffff, 0xffffffff, FALSE
),
166 /* Replace a 32-bit value with a value from the runtime linker (only
167 used by linker-generated stub functions). The r_addend value is
168 special: 1 means to substitute a pointer to the runtime linker's
169 dynamic resolver function; 2 means to substitute the link map for
170 the shared object. */
171 HOWTO (R_XTENSA_RTLD
, 0, 2, 32, FALSE
, 0, complain_overflow_dont
,
172 NULL
, "R_XTENSA_RTLD", FALSE
, 0, 0, FALSE
),
174 HOWTO (R_XTENSA_GLOB_DAT
, 0, 2, 32, FALSE
, 0, complain_overflow_bitfield
,
175 bfd_elf_generic_reloc
, "R_XTENSA_GLOB_DAT",
176 FALSE
, 0, 0xffffffff, FALSE
),
177 HOWTO (R_XTENSA_JMP_SLOT
, 0, 2, 32, FALSE
, 0, complain_overflow_bitfield
,
178 bfd_elf_generic_reloc
, "R_XTENSA_JMP_SLOT",
179 FALSE
, 0, 0xffffffff, FALSE
),
180 HOWTO (R_XTENSA_RELATIVE
, 0, 2, 32, FALSE
, 0, complain_overflow_bitfield
,
181 bfd_elf_generic_reloc
, "R_XTENSA_RELATIVE",
182 FALSE
, 0, 0xffffffff, FALSE
),
183 HOWTO (R_XTENSA_PLT
, 0, 2, 32, FALSE
, 0, complain_overflow_bitfield
,
184 bfd_elf_xtensa_reloc
, "R_XTENSA_PLT",
185 FALSE
, 0, 0xffffffff, FALSE
),
189 /* Old relocations for backward compatibility. */
190 HOWTO (R_XTENSA_OP0
, 0, 0, 0, TRUE
, 0, complain_overflow_dont
,
191 bfd_elf_xtensa_reloc
, "R_XTENSA_OP0", FALSE
, 0, 0, TRUE
),
192 HOWTO (R_XTENSA_OP1
, 0, 0, 0, TRUE
, 0, complain_overflow_dont
,
193 bfd_elf_xtensa_reloc
, "R_XTENSA_OP1", FALSE
, 0, 0, TRUE
),
194 HOWTO (R_XTENSA_OP2
, 0, 0, 0, TRUE
, 0, complain_overflow_dont
,
195 bfd_elf_xtensa_reloc
, "R_XTENSA_OP2", FALSE
, 0, 0, TRUE
),
197 /* Assembly auto-expansion. */
198 HOWTO (R_XTENSA_ASM_EXPAND
, 0, 0, 0, TRUE
, 0, complain_overflow_dont
,
199 bfd_elf_xtensa_reloc
, "R_XTENSA_ASM_EXPAND", FALSE
, 0, 0, TRUE
),
200 /* Relax assembly auto-expansion. */
201 HOWTO (R_XTENSA_ASM_SIMPLIFY
, 0, 0, 0, TRUE
, 0, complain_overflow_dont
,
202 bfd_elf_xtensa_reloc
, "R_XTENSA_ASM_SIMPLIFY", FALSE
, 0, 0, TRUE
),
207 /* GNU extension to record C++ vtable hierarchy. */
208 HOWTO (R_XTENSA_GNU_VTINHERIT
, 0, 2, 0, FALSE
, 0, complain_overflow_dont
,
209 NULL
, "R_XTENSA_GNU_VTINHERIT",
211 /* GNU extension to record C++ vtable member usage. */
212 HOWTO (R_XTENSA_GNU_VTENTRY
, 0, 2, 0, FALSE
, 0, complain_overflow_dont
,
213 _bfd_elf_rel_vtable_reloc_fn
, "R_XTENSA_GNU_VTENTRY",
216 /* Relocations for supporting difference of symbols. */
217 HOWTO (R_XTENSA_DIFF8
, 0, 0, 8, FALSE
, 0, complain_overflow_bitfield
,
218 bfd_elf_xtensa_reloc
, "R_XTENSA_DIFF8", FALSE
, 0, 0xff, FALSE
),
219 HOWTO (R_XTENSA_DIFF16
, 0, 1, 16, FALSE
, 0, complain_overflow_bitfield
,
220 bfd_elf_xtensa_reloc
, "R_XTENSA_DIFF16", FALSE
, 0, 0xffff, FALSE
),
221 HOWTO (R_XTENSA_DIFF32
, 0, 2, 32, FALSE
, 0, complain_overflow_bitfield
,
222 bfd_elf_xtensa_reloc
, "R_XTENSA_DIFF32", FALSE
, 0, 0xffffffff, FALSE
),
224 /* General immediate operand relocations. */
225 HOWTO (R_XTENSA_SLOT0_OP
, 0, 0, 0, TRUE
, 0, complain_overflow_dont
,
226 bfd_elf_xtensa_reloc
, "R_XTENSA_SLOT0_OP", FALSE
, 0, 0, TRUE
),
227 HOWTO (R_XTENSA_SLOT1_OP
, 0, 0, 0, TRUE
, 0, complain_overflow_dont
,
228 bfd_elf_xtensa_reloc
, "R_XTENSA_SLOT1_OP", FALSE
, 0, 0, TRUE
),
229 HOWTO (R_XTENSA_SLOT2_OP
, 0, 0, 0, TRUE
, 0, complain_overflow_dont
,
230 bfd_elf_xtensa_reloc
, "R_XTENSA_SLOT2_OP", FALSE
, 0, 0, TRUE
),
231 HOWTO (R_XTENSA_SLOT3_OP
, 0, 0, 0, TRUE
, 0, complain_overflow_dont
,
232 bfd_elf_xtensa_reloc
, "R_XTENSA_SLOT3_OP", FALSE
, 0, 0, TRUE
),
233 HOWTO (R_XTENSA_SLOT4_OP
, 0, 0, 0, TRUE
, 0, complain_overflow_dont
,
234 bfd_elf_xtensa_reloc
, "R_XTENSA_SLOT4_OP", FALSE
, 0, 0, TRUE
),
235 HOWTO (R_XTENSA_SLOT5_OP
, 0, 0, 0, TRUE
, 0, complain_overflow_dont
,
236 bfd_elf_xtensa_reloc
, "R_XTENSA_SLOT5_OP", FALSE
, 0, 0, TRUE
),
237 HOWTO (R_XTENSA_SLOT6_OP
, 0, 0, 0, TRUE
, 0, complain_overflow_dont
,
238 bfd_elf_xtensa_reloc
, "R_XTENSA_SLOT6_OP", FALSE
, 0, 0, TRUE
),
239 HOWTO (R_XTENSA_SLOT7_OP
, 0, 0, 0, TRUE
, 0, complain_overflow_dont
,
240 bfd_elf_xtensa_reloc
, "R_XTENSA_SLOT7_OP", FALSE
, 0, 0, TRUE
),
241 HOWTO (R_XTENSA_SLOT8_OP
, 0, 0, 0, TRUE
, 0, complain_overflow_dont
,
242 bfd_elf_xtensa_reloc
, "R_XTENSA_SLOT8_OP", FALSE
, 0, 0, TRUE
),
243 HOWTO (R_XTENSA_SLOT9_OP
, 0, 0, 0, TRUE
, 0, complain_overflow_dont
,
244 bfd_elf_xtensa_reloc
, "R_XTENSA_SLOT9_OP", FALSE
, 0, 0, TRUE
),
245 HOWTO (R_XTENSA_SLOT10_OP
, 0, 0, 0, TRUE
, 0, complain_overflow_dont
,
246 bfd_elf_xtensa_reloc
, "R_XTENSA_SLOT10_OP", FALSE
, 0, 0, TRUE
),
247 HOWTO (R_XTENSA_SLOT11_OP
, 0, 0, 0, TRUE
, 0, complain_overflow_dont
,
248 bfd_elf_xtensa_reloc
, "R_XTENSA_SLOT11_OP", FALSE
, 0, 0, TRUE
),
249 HOWTO (R_XTENSA_SLOT12_OP
, 0, 0, 0, TRUE
, 0, complain_overflow_dont
,
250 bfd_elf_xtensa_reloc
, "R_XTENSA_SLOT12_OP", FALSE
, 0, 0, TRUE
),
251 HOWTO (R_XTENSA_SLOT13_OP
, 0, 0, 0, TRUE
, 0, complain_overflow_dont
,
252 bfd_elf_xtensa_reloc
, "R_XTENSA_SLOT13_OP", FALSE
, 0, 0, TRUE
),
253 HOWTO (R_XTENSA_SLOT14_OP
, 0, 0, 0, TRUE
, 0, complain_overflow_dont
,
254 bfd_elf_xtensa_reloc
, "R_XTENSA_SLOT14_OP", FALSE
, 0, 0, TRUE
),
256 /* "Alternate" relocations. The meaning of these is opcode-specific. */
257 HOWTO (R_XTENSA_SLOT0_ALT
, 0, 0, 0, TRUE
, 0, complain_overflow_dont
,
258 bfd_elf_xtensa_reloc
, "R_XTENSA_SLOT0_ALT", FALSE
, 0, 0, TRUE
),
259 HOWTO (R_XTENSA_SLOT1_ALT
, 0, 0, 0, TRUE
, 0, complain_overflow_dont
,
260 bfd_elf_xtensa_reloc
, "R_XTENSA_SLOT1_ALT", FALSE
, 0, 0, TRUE
),
261 HOWTO (R_XTENSA_SLOT2_ALT
, 0, 0, 0, TRUE
, 0, complain_overflow_dont
,
262 bfd_elf_xtensa_reloc
, "R_XTENSA_SLOT2_ALT", FALSE
, 0, 0, TRUE
),
263 HOWTO (R_XTENSA_SLOT3_ALT
, 0, 0, 0, TRUE
, 0, complain_overflow_dont
,
264 bfd_elf_xtensa_reloc
, "R_XTENSA_SLOT3_ALT", FALSE
, 0, 0, TRUE
),
265 HOWTO (R_XTENSA_SLOT4_ALT
, 0, 0, 0, TRUE
, 0, complain_overflow_dont
,
266 bfd_elf_xtensa_reloc
, "R_XTENSA_SLOT4_ALT", FALSE
, 0, 0, TRUE
),
267 HOWTO (R_XTENSA_SLOT5_ALT
, 0, 0, 0, TRUE
, 0, complain_overflow_dont
,
268 bfd_elf_xtensa_reloc
, "R_XTENSA_SLOT5_ALT", FALSE
, 0, 0, TRUE
),
269 HOWTO (R_XTENSA_SLOT6_ALT
, 0, 0, 0, TRUE
, 0, complain_overflow_dont
,
270 bfd_elf_xtensa_reloc
, "R_XTENSA_SLOT6_ALT", FALSE
, 0, 0, TRUE
),
271 HOWTO (R_XTENSA_SLOT7_ALT
, 0, 0, 0, TRUE
, 0, complain_overflow_dont
,
272 bfd_elf_xtensa_reloc
, "R_XTENSA_SLOT7_ALT", FALSE
, 0, 0, TRUE
),
273 HOWTO (R_XTENSA_SLOT8_ALT
, 0, 0, 0, TRUE
, 0, complain_overflow_dont
,
274 bfd_elf_xtensa_reloc
, "R_XTENSA_SLOT8_ALT", FALSE
, 0, 0, TRUE
),
275 HOWTO (R_XTENSA_SLOT9_ALT
, 0, 0, 0, TRUE
, 0, complain_overflow_dont
,
276 bfd_elf_xtensa_reloc
, "R_XTENSA_SLOT9_ALT", FALSE
, 0, 0, TRUE
),
277 HOWTO (R_XTENSA_SLOT10_ALT
, 0, 0, 0, TRUE
, 0, complain_overflow_dont
,
278 bfd_elf_xtensa_reloc
, "R_XTENSA_SLOT10_ALT", FALSE
, 0, 0, TRUE
),
279 HOWTO (R_XTENSA_SLOT11_ALT
, 0, 0, 0, TRUE
, 0, complain_overflow_dont
,
280 bfd_elf_xtensa_reloc
, "R_XTENSA_SLOT11_ALT", FALSE
, 0, 0, TRUE
),
281 HOWTO (R_XTENSA_SLOT12_ALT
, 0, 0, 0, TRUE
, 0, complain_overflow_dont
,
282 bfd_elf_xtensa_reloc
, "R_XTENSA_SLOT12_ALT", FALSE
, 0, 0, TRUE
),
283 HOWTO (R_XTENSA_SLOT13_ALT
, 0, 0, 0, TRUE
, 0, complain_overflow_dont
,
284 bfd_elf_xtensa_reloc
, "R_XTENSA_SLOT13_ALT", FALSE
, 0, 0, TRUE
),
285 HOWTO (R_XTENSA_SLOT14_ALT
, 0, 0, 0, TRUE
, 0, complain_overflow_dont
,
286 bfd_elf_xtensa_reloc
, "R_XTENSA_SLOT14_ALT", FALSE
, 0, 0, TRUE
),
291 fprintf (stderr, "Xtensa bfd reloc lookup %d (%s)\n", code, str)
296 static reloc_howto_type
*
297 elf_xtensa_reloc_type_lookup (bfd
*abfd ATTRIBUTE_UNUSED
,
298 bfd_reloc_code_real_type code
)
303 TRACE ("BFD_RELOC_NONE");
304 return &elf_howto_table
[(unsigned) R_XTENSA_NONE
];
307 TRACE ("BFD_RELOC_32");
308 return &elf_howto_table
[(unsigned) R_XTENSA_32
];
310 case BFD_RELOC_XTENSA_DIFF8
:
311 TRACE ("BFD_RELOC_XTENSA_DIFF8");
312 return &elf_howto_table
[(unsigned) R_XTENSA_DIFF8
];
314 case BFD_RELOC_XTENSA_DIFF16
:
315 TRACE ("BFD_RELOC_XTENSA_DIFF16");
316 return &elf_howto_table
[(unsigned) R_XTENSA_DIFF16
];
318 case BFD_RELOC_XTENSA_DIFF32
:
319 TRACE ("BFD_RELOC_XTENSA_DIFF32");
320 return &elf_howto_table
[(unsigned) R_XTENSA_DIFF32
];
322 case BFD_RELOC_XTENSA_RTLD
:
323 TRACE ("BFD_RELOC_XTENSA_RTLD");
324 return &elf_howto_table
[(unsigned) R_XTENSA_RTLD
];
326 case BFD_RELOC_XTENSA_GLOB_DAT
:
327 TRACE ("BFD_RELOC_XTENSA_GLOB_DAT");
328 return &elf_howto_table
[(unsigned) R_XTENSA_GLOB_DAT
];
330 case BFD_RELOC_XTENSA_JMP_SLOT
:
331 TRACE ("BFD_RELOC_XTENSA_JMP_SLOT");
332 return &elf_howto_table
[(unsigned) R_XTENSA_JMP_SLOT
];
334 case BFD_RELOC_XTENSA_RELATIVE
:
335 TRACE ("BFD_RELOC_XTENSA_RELATIVE");
336 return &elf_howto_table
[(unsigned) R_XTENSA_RELATIVE
];
338 case BFD_RELOC_XTENSA_PLT
:
339 TRACE ("BFD_RELOC_XTENSA_PLT");
340 return &elf_howto_table
[(unsigned) R_XTENSA_PLT
];
342 case BFD_RELOC_XTENSA_OP0
:
343 TRACE ("BFD_RELOC_XTENSA_OP0");
344 return &elf_howto_table
[(unsigned) R_XTENSA_OP0
];
346 case BFD_RELOC_XTENSA_OP1
:
347 TRACE ("BFD_RELOC_XTENSA_OP1");
348 return &elf_howto_table
[(unsigned) R_XTENSA_OP1
];
350 case BFD_RELOC_XTENSA_OP2
:
351 TRACE ("BFD_RELOC_XTENSA_OP2");
352 return &elf_howto_table
[(unsigned) R_XTENSA_OP2
];
354 case BFD_RELOC_XTENSA_ASM_EXPAND
:
355 TRACE ("BFD_RELOC_XTENSA_ASM_EXPAND");
356 return &elf_howto_table
[(unsigned) R_XTENSA_ASM_EXPAND
];
358 case BFD_RELOC_XTENSA_ASM_SIMPLIFY
:
359 TRACE ("BFD_RELOC_XTENSA_ASM_SIMPLIFY");
360 return &elf_howto_table
[(unsigned) R_XTENSA_ASM_SIMPLIFY
];
362 case BFD_RELOC_VTABLE_INHERIT
:
363 TRACE ("BFD_RELOC_VTABLE_INHERIT");
364 return &elf_howto_table
[(unsigned) R_XTENSA_GNU_VTINHERIT
];
366 case BFD_RELOC_VTABLE_ENTRY
:
367 TRACE ("BFD_RELOC_VTABLE_ENTRY");
368 return &elf_howto_table
[(unsigned) R_XTENSA_GNU_VTENTRY
];
371 if (code
>= BFD_RELOC_XTENSA_SLOT0_OP
372 && code
<= BFD_RELOC_XTENSA_SLOT14_OP
)
374 unsigned n
= (R_XTENSA_SLOT0_OP
+
375 (code
- BFD_RELOC_XTENSA_SLOT0_OP
));
376 return &elf_howto_table
[n
];
379 if (code
>= BFD_RELOC_XTENSA_SLOT0_ALT
380 && code
<= BFD_RELOC_XTENSA_SLOT14_ALT
)
382 unsigned n
= (R_XTENSA_SLOT0_ALT
+
383 (code
- BFD_RELOC_XTENSA_SLOT0_ALT
));
384 return &elf_howto_table
[n
];
394 static reloc_howto_type
*
395 elf_xtensa_reloc_name_lookup (bfd
*abfd ATTRIBUTE_UNUSED
,
400 for (i
= 0; i
< sizeof (elf_howto_table
) / sizeof (elf_howto_table
[0]); i
++)
401 if (elf_howto_table
[i
].name
!= NULL
402 && strcasecmp (elf_howto_table
[i
].name
, r_name
) == 0)
403 return &elf_howto_table
[i
];
409 /* Given an ELF "rela" relocation, find the corresponding howto and record
410 it in the BFD internal arelent representation of the relocation. */
413 elf_xtensa_info_to_howto_rela (bfd
*abfd ATTRIBUTE_UNUSED
,
415 Elf_Internal_Rela
*dst
)
417 unsigned int r_type
= ELF32_R_TYPE (dst
->r_info
);
419 BFD_ASSERT (r_type
< (unsigned int) R_XTENSA_max
);
420 cache_ptr
->howto
= &elf_howto_table
[r_type
];
424 /* Functions for the Xtensa ELF linker. */
426 /* The name of the dynamic interpreter. This is put in the .interp
429 #define ELF_DYNAMIC_INTERPRETER "/lib/ld.so"
431 /* The size in bytes of an entry in the procedure linkage table.
432 (This does _not_ include the space for the literals associated with
435 #define PLT_ENTRY_SIZE 16
437 /* For _really_ large PLTs, we may need to alternate between literals
438 and code to keep the literals within the 256K range of the L32R
439 instructions in the code. It's unlikely that anyone would ever need
440 such a big PLT, but an arbitrary limit on the PLT size would be bad.
441 Thus, we split the PLT into chunks. Since there's very little
442 overhead (2 extra literals) for each chunk, the chunk size is kept
443 small so that the code for handling multiple chunks get used and
444 tested regularly. With 254 entries, there are 1K of literals for
445 each chunk, and that seems like a nice round number. */
447 #define PLT_ENTRIES_PER_CHUNK 254
449 /* PLT entries are actually used as stub functions for lazy symbol
450 resolution. Once the symbol is resolved, the stub function is never
451 invoked. Note: the 32-byte frame size used here cannot be changed
452 without a corresponding change in the runtime linker. */
454 static const bfd_byte elf_xtensa_be_plt_entry
[PLT_ENTRY_SIZE
] =
456 0x6c, 0x10, 0x04, /* entry sp, 32 */
457 0x18, 0x00, 0x00, /* l32r a8, [got entry for rtld's resolver] */
458 0x1a, 0x00, 0x00, /* l32r a10, [got entry for rtld's link map] */
459 0x1b, 0x00, 0x00, /* l32r a11, [literal for reloc index] */
460 0x0a, 0x80, 0x00, /* jx a8 */
464 static const bfd_byte elf_xtensa_le_plt_entry
[PLT_ENTRY_SIZE
] =
466 0x36, 0x41, 0x00, /* entry sp, 32 */
467 0x81, 0x00, 0x00, /* l32r a8, [got entry for rtld's resolver] */
468 0xa1, 0x00, 0x00, /* l32r a10, [got entry for rtld's link map] */
469 0xb1, 0x00, 0x00, /* l32r a11, [literal for reloc index] */
470 0xa0, 0x08, 0x00, /* jx a8 */
474 /* Xtensa ELF linker hash table. */
476 struct elf_xtensa_link_hash_table
478 struct elf_link_hash_table elf
;
480 /* Short-cuts to get to dynamic linker sections. */
487 asection
*spltlittbl
;
489 /* Total count of PLT relocations seen during check_relocs.
490 The actual PLT code must be split into multiple sections and all
491 the sections have to be created before size_dynamic_sections,
492 where we figure out the exact number of PLT entries that will be
493 needed. It is OK if this count is an overestimate, e.g., some
494 relocations may be removed by GC. */
498 /* Get the Xtensa ELF linker hash table from a link_info structure. */
500 #define elf_xtensa_hash_table(p) \
501 ((struct elf_xtensa_link_hash_table *) ((p)->hash))
503 /* Create an Xtensa ELF linker hash table. */
505 static struct bfd_link_hash_table
*
506 elf_xtensa_link_hash_table_create (bfd
*abfd
)
508 struct elf_xtensa_link_hash_table
*ret
;
509 bfd_size_type amt
= sizeof (struct elf_xtensa_link_hash_table
);
511 ret
= bfd_malloc (amt
);
515 if (!_bfd_elf_link_hash_table_init (&ret
->elf
, abfd
,
516 _bfd_elf_link_hash_newfunc
,
517 sizeof (struct elf_link_hash_entry
)))
529 ret
->spltlittbl
= NULL
;
531 ret
->plt_reloc_count
= 0;
533 return &ret
->elf
.root
;
536 static inline bfd_boolean
537 elf_xtensa_dynamic_symbol_p (struct elf_link_hash_entry
*h
,
538 struct bfd_link_info
*info
)
540 /* Check if we should do dynamic things to this symbol. The
541 "ignore_protected" argument need not be set, because Xtensa code
542 does not require special handling of STV_PROTECTED to make function
543 pointer comparisons work properly. The PLT addresses are never
544 used for function pointers. */
546 return _bfd_elf_dynamic_symbol_p (h
, info
, 0);
551 property_table_compare (const void *ap
, const void *bp
)
553 const property_table_entry
*a
= (const property_table_entry
*) ap
;
554 const property_table_entry
*b
= (const property_table_entry
*) bp
;
556 if (a
->address
== b
->address
)
558 if (a
->size
!= b
->size
)
559 return (a
->size
- b
->size
);
561 if ((a
->flags
& XTENSA_PROP_ALIGN
) != (b
->flags
& XTENSA_PROP_ALIGN
))
562 return ((b
->flags
& XTENSA_PROP_ALIGN
)
563 - (a
->flags
& XTENSA_PROP_ALIGN
));
565 if ((a
->flags
& XTENSA_PROP_ALIGN
)
566 && (GET_XTENSA_PROP_ALIGNMENT (a
->flags
)
567 != GET_XTENSA_PROP_ALIGNMENT (b
->flags
)))
568 return (GET_XTENSA_PROP_ALIGNMENT (a
->flags
)
569 - GET_XTENSA_PROP_ALIGNMENT (b
->flags
));
571 if ((a
->flags
& XTENSA_PROP_UNREACHABLE
)
572 != (b
->flags
& XTENSA_PROP_UNREACHABLE
))
573 return ((b
->flags
& XTENSA_PROP_UNREACHABLE
)
574 - (a
->flags
& XTENSA_PROP_UNREACHABLE
));
576 return (a
->flags
- b
->flags
);
579 return (a
->address
- b
->address
);
584 property_table_matches (const void *ap
, const void *bp
)
586 const property_table_entry
*a
= (const property_table_entry
*) ap
;
587 const property_table_entry
*b
= (const property_table_entry
*) bp
;
589 /* Check if one entry overlaps with the other. */
590 if ((b
->address
>= a
->address
&& b
->address
< (a
->address
+ a
->size
))
591 || (a
->address
>= b
->address
&& a
->address
< (b
->address
+ b
->size
)))
594 return (a
->address
- b
->address
);
598 /* Get the literal table or property table entries for the given
599 section. Sets TABLE_P and returns the number of entries. On
600 error, returns a negative value. */
603 xtensa_read_table_entries (bfd
*abfd
,
605 property_table_entry
**table_p
,
606 const char *sec_name
,
607 bfd_boolean output_addr
)
609 asection
*table_section
;
610 bfd_size_type table_size
= 0;
611 bfd_byte
*table_data
;
612 property_table_entry
*blocks
;
613 int blk
, block_count
;
614 bfd_size_type num_records
;
615 Elf_Internal_Rela
*internal_relocs
, *irel
, *rel_end
;
616 bfd_vma section_addr
, off
;
617 flagword predef_flags
;
618 bfd_size_type table_entry_size
, section_limit
;
621 || !(section
->flags
& SEC_ALLOC
)
622 || (section
->flags
& SEC_DEBUGGING
))
628 table_section
= xtensa_get_property_section (section
, sec_name
);
630 table_size
= table_section
->size
;
638 predef_flags
= xtensa_get_property_predef_flags (table_section
);
639 table_entry_size
= 12;
641 table_entry_size
-= 4;
643 num_records
= table_size
/ table_entry_size
;
644 table_data
= retrieve_contents (abfd
, table_section
, TRUE
);
645 blocks
= (property_table_entry
*)
646 bfd_malloc (num_records
* sizeof (property_table_entry
));
650 section_addr
= section
->output_section
->vma
+ section
->output_offset
;
652 section_addr
= section
->vma
;
654 internal_relocs
= retrieve_internal_relocs (abfd
, table_section
, TRUE
);
655 if (internal_relocs
&& !table_section
->reloc_done
)
657 qsort (internal_relocs
, table_section
->reloc_count
,
658 sizeof (Elf_Internal_Rela
), internal_reloc_compare
);
659 irel
= internal_relocs
;
664 section_limit
= bfd_get_section_limit (abfd
, section
);
665 rel_end
= internal_relocs
+ table_section
->reloc_count
;
667 for (off
= 0; off
< table_size
; off
+= table_entry_size
)
669 bfd_vma address
= bfd_get_32 (abfd
, table_data
+ off
);
671 /* Skip any relocations before the current offset. This should help
672 avoid confusion caused by unexpected relocations for the preceding
675 (irel
->r_offset
< off
676 || (irel
->r_offset
== off
677 && ELF32_R_TYPE (irel
->r_info
) == R_XTENSA_NONE
)))
684 if (irel
&& irel
->r_offset
== off
)
687 unsigned long r_symndx
= ELF32_R_SYM (irel
->r_info
);
688 BFD_ASSERT (ELF32_R_TYPE (irel
->r_info
) == R_XTENSA_32
);
690 if (get_elf_r_symndx_section (abfd
, r_symndx
) != section
)
693 sym_off
= get_elf_r_symndx_offset (abfd
, r_symndx
);
694 BFD_ASSERT (sym_off
== 0);
695 address
+= (section_addr
+ sym_off
+ irel
->r_addend
);
699 if (address
< section_addr
700 || address
>= section_addr
+ section_limit
)
704 blocks
[block_count
].address
= address
;
705 blocks
[block_count
].size
= bfd_get_32 (abfd
, table_data
+ off
+ 4);
707 blocks
[block_count
].flags
= predef_flags
;
709 blocks
[block_count
].flags
= bfd_get_32 (abfd
, table_data
+ off
+ 8);
713 release_contents (table_section
, table_data
);
714 release_internal_relocs (table_section
, internal_relocs
);
718 /* Now sort them into address order for easy reference. */
719 qsort (blocks
, block_count
, sizeof (property_table_entry
),
720 property_table_compare
);
722 /* Check that the table contents are valid. Problems may occur,
723 for example, if an unrelocated object file is stripped. */
724 for (blk
= 1; blk
< block_count
; blk
++)
726 /* The only circumstance where two entries may legitimately
727 have the same address is when one of them is a zero-size
728 placeholder to mark a place where fill can be inserted.
729 The zero-size entry should come first. */
730 if (blocks
[blk
- 1].address
== blocks
[blk
].address
&&
731 blocks
[blk
- 1].size
!= 0)
733 (*_bfd_error_handler
) (_("%B(%A): invalid property table"),
735 bfd_set_error (bfd_error_bad_value
);
747 static property_table_entry
*
748 elf_xtensa_find_property_entry (property_table_entry
*property_table
,
749 int property_table_size
,
752 property_table_entry entry
;
753 property_table_entry
*rv
;
755 if (property_table_size
== 0)
758 entry
.address
= addr
;
762 rv
= bsearch (&entry
, property_table
, property_table_size
,
763 sizeof (property_table_entry
), property_table_matches
);
769 elf_xtensa_in_literal_pool (property_table_entry
*lit_table
,
773 if (elf_xtensa_find_property_entry (lit_table
, lit_table_size
, addr
))
780 /* Look through the relocs for a section during the first phase, and
781 calculate needed space in the dynamic reloc sections. */
784 elf_xtensa_check_relocs (bfd
*abfd
,
785 struct bfd_link_info
*info
,
787 const Elf_Internal_Rela
*relocs
)
789 struct elf_xtensa_link_hash_table
*htab
;
790 Elf_Internal_Shdr
*symtab_hdr
;
791 struct elf_link_hash_entry
**sym_hashes
;
792 const Elf_Internal_Rela
*rel
;
793 const Elf_Internal_Rela
*rel_end
;
795 if (info
->relocatable
)
798 htab
= elf_xtensa_hash_table (info
);
799 symtab_hdr
= &elf_tdata (abfd
)->symtab_hdr
;
800 sym_hashes
= elf_sym_hashes (abfd
);
802 rel_end
= relocs
+ sec
->reloc_count
;
803 for (rel
= relocs
; rel
< rel_end
; rel
++)
806 unsigned long r_symndx
;
807 struct elf_link_hash_entry
*h
;
809 r_symndx
= ELF32_R_SYM (rel
->r_info
);
810 r_type
= ELF32_R_TYPE (rel
->r_info
);
812 if (r_symndx
>= NUM_SHDR_ENTRIES (symtab_hdr
))
814 (*_bfd_error_handler
) (_("%B: bad symbol index: %d"),
819 if (r_symndx
< symtab_hdr
->sh_info
)
823 h
= sym_hashes
[r_symndx
- symtab_hdr
->sh_info
];
824 while (h
->root
.type
== bfd_link_hash_indirect
825 || h
->root
.type
== bfd_link_hash_warning
)
826 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
835 if ((sec
->flags
& SEC_ALLOC
) != 0)
837 if (h
->got
.refcount
<= 0)
840 h
->got
.refcount
+= 1;
845 /* If this relocation is against a local symbol, then it's
846 exactly the same as a normal local GOT entry. */
850 if ((sec
->flags
& SEC_ALLOC
) != 0)
852 if (h
->plt
.refcount
<= 0)
858 h
->plt
.refcount
+= 1;
860 /* Keep track of the total PLT relocation count even if we
861 don't yet know whether the dynamic sections will be
863 htab
->plt_reloc_count
+= 1;
865 if (elf_hash_table (info
)->dynamic_sections_created
)
867 if (! add_extra_plt_sections (info
, htab
->plt_reloc_count
))
874 if ((sec
->flags
& SEC_ALLOC
) != 0)
876 bfd_signed_vma
*local_got_refcounts
;
878 /* This is a global offset table entry for a local symbol. */
879 local_got_refcounts
= elf_local_got_refcounts (abfd
);
880 if (local_got_refcounts
== NULL
)
884 size
= symtab_hdr
->sh_info
;
885 size
*= sizeof (bfd_signed_vma
);
886 local_got_refcounts
=
887 (bfd_signed_vma
*) bfd_zalloc (abfd
, size
);
888 if (local_got_refcounts
== NULL
)
890 elf_local_got_refcounts (abfd
) = local_got_refcounts
;
892 local_got_refcounts
[r_symndx
] += 1;
899 case R_XTENSA_SLOT0_OP
:
900 case R_XTENSA_SLOT1_OP
:
901 case R_XTENSA_SLOT2_OP
:
902 case R_XTENSA_SLOT3_OP
:
903 case R_XTENSA_SLOT4_OP
:
904 case R_XTENSA_SLOT5_OP
:
905 case R_XTENSA_SLOT6_OP
:
906 case R_XTENSA_SLOT7_OP
:
907 case R_XTENSA_SLOT8_OP
:
908 case R_XTENSA_SLOT9_OP
:
909 case R_XTENSA_SLOT10_OP
:
910 case R_XTENSA_SLOT11_OP
:
911 case R_XTENSA_SLOT12_OP
:
912 case R_XTENSA_SLOT13_OP
:
913 case R_XTENSA_SLOT14_OP
:
914 case R_XTENSA_SLOT0_ALT
:
915 case R_XTENSA_SLOT1_ALT
:
916 case R_XTENSA_SLOT2_ALT
:
917 case R_XTENSA_SLOT3_ALT
:
918 case R_XTENSA_SLOT4_ALT
:
919 case R_XTENSA_SLOT5_ALT
:
920 case R_XTENSA_SLOT6_ALT
:
921 case R_XTENSA_SLOT7_ALT
:
922 case R_XTENSA_SLOT8_ALT
:
923 case R_XTENSA_SLOT9_ALT
:
924 case R_XTENSA_SLOT10_ALT
:
925 case R_XTENSA_SLOT11_ALT
:
926 case R_XTENSA_SLOT12_ALT
:
927 case R_XTENSA_SLOT13_ALT
:
928 case R_XTENSA_SLOT14_ALT
:
929 case R_XTENSA_ASM_EXPAND
:
930 case R_XTENSA_ASM_SIMPLIFY
:
932 case R_XTENSA_DIFF16
:
933 case R_XTENSA_DIFF32
:
934 /* Nothing to do for these. */
937 case R_XTENSA_GNU_VTINHERIT
:
938 /* This relocation describes the C++ object vtable hierarchy.
939 Reconstruct it for later use during GC. */
940 if (!bfd_elf_gc_record_vtinherit (abfd
, sec
, h
, rel
->r_offset
))
944 case R_XTENSA_GNU_VTENTRY
:
945 /* This relocation describes which C++ vtable entries are actually
946 used. Record for later use during GC. */
947 BFD_ASSERT (h
!= NULL
);
949 && !bfd_elf_gc_record_vtentry (abfd
, sec
, h
, rel
->r_addend
))
963 elf_xtensa_make_sym_local (struct bfd_link_info
*info
,
964 struct elf_link_hash_entry
*h
)
968 if (h
->plt
.refcount
> 0)
970 /* For shared objects, there's no need for PLT entries for local
971 symbols (use RELATIVE relocs instead of JMP_SLOT relocs). */
972 if (h
->got
.refcount
< 0)
974 h
->got
.refcount
+= h
->plt
.refcount
;
980 /* Don't need any dynamic relocations at all. */
988 elf_xtensa_hide_symbol (struct bfd_link_info
*info
,
989 struct elf_link_hash_entry
*h
,
990 bfd_boolean force_local
)
992 /* For a shared link, move the plt refcount to the got refcount to leave
993 space for RELATIVE relocs. */
994 elf_xtensa_make_sym_local (info
, h
);
996 _bfd_elf_link_hash_hide_symbol (info
, h
, force_local
);
1000 /* Return the section that should be marked against GC for a given
1004 elf_xtensa_gc_mark_hook (asection
*sec
,
1005 struct bfd_link_info
*info
,
1006 Elf_Internal_Rela
*rel
,
1007 struct elf_link_hash_entry
*h
,
1008 Elf_Internal_Sym
*sym
)
1010 /* Property sections are marked "KEEP" in the linker scripts, but they
1011 should not cause other sections to be marked. (This approach relies
1012 on elf_xtensa_discard_info to remove property table entries that
1013 describe discarded sections. Alternatively, it might be more
1014 efficient to avoid using "KEEP" in the linker scripts and instead use
1015 the gc_mark_extra_sections hook to mark only the property sections
1016 that describe marked sections. That alternative does not work well
1017 with the current property table sections, which do not correspond
1018 one-to-one with the sections they describe, but that should be fixed
1020 if (xtensa_is_property_section (sec
))
1024 switch (ELF32_R_TYPE (rel
->r_info
))
1026 case R_XTENSA_GNU_VTINHERIT
:
1027 case R_XTENSA_GNU_VTENTRY
:
1031 return _bfd_elf_gc_mark_hook (sec
, info
, rel
, h
, sym
);
1035 /* Update the GOT & PLT entry reference counts
1036 for the section being removed. */
1039 elf_xtensa_gc_sweep_hook (bfd
*abfd
,
1040 struct bfd_link_info
*info ATTRIBUTE_UNUSED
,
1042 const Elf_Internal_Rela
*relocs
)
1044 Elf_Internal_Shdr
*symtab_hdr
;
1045 struct elf_link_hash_entry
**sym_hashes
;
1046 bfd_signed_vma
*local_got_refcounts
;
1047 const Elf_Internal_Rela
*rel
, *relend
;
1049 if ((sec
->flags
& SEC_ALLOC
) == 0)
1052 symtab_hdr
= &elf_tdata (abfd
)->symtab_hdr
;
1053 sym_hashes
= elf_sym_hashes (abfd
);
1054 local_got_refcounts
= elf_local_got_refcounts (abfd
);
1056 relend
= relocs
+ sec
->reloc_count
;
1057 for (rel
= relocs
; rel
< relend
; rel
++)
1059 unsigned long r_symndx
;
1060 unsigned int r_type
;
1061 struct elf_link_hash_entry
*h
= NULL
;
1063 r_symndx
= ELF32_R_SYM (rel
->r_info
);
1064 if (r_symndx
>= symtab_hdr
->sh_info
)
1066 h
= sym_hashes
[r_symndx
- symtab_hdr
->sh_info
];
1067 while (h
->root
.type
== bfd_link_hash_indirect
1068 || h
->root
.type
== bfd_link_hash_warning
)
1069 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
1072 r_type
= ELF32_R_TYPE (rel
->r_info
);
1078 if (h
->got
.refcount
> 0)
1085 if (h
->plt
.refcount
> 0)
1090 if (local_got_refcounts
[r_symndx
] > 0)
1091 local_got_refcounts
[r_symndx
] -= 1;
1103 /* Create all the dynamic sections. */
1106 elf_xtensa_create_dynamic_sections (bfd
*dynobj
, struct bfd_link_info
*info
)
1108 struct elf_xtensa_link_hash_table
*htab
;
1109 flagword flags
, noalloc_flags
;
1111 htab
= elf_xtensa_hash_table (info
);
1113 /* First do all the standard stuff. */
1114 if (! _bfd_elf_create_dynamic_sections (dynobj
, info
))
1116 htab
->splt
= bfd_get_section_by_name (dynobj
, ".plt");
1117 htab
->srelplt
= bfd_get_section_by_name (dynobj
, ".rela.plt");
1118 htab
->sgot
= bfd_get_section_by_name (dynobj
, ".got");
1119 htab
->sgotplt
= bfd_get_section_by_name (dynobj
, ".got.plt");
1121 /* Create any extra PLT sections in case check_relocs has already
1122 been called on all the non-dynamic input files. */
1123 if (! add_extra_plt_sections (info
, htab
->plt_reloc_count
))
1126 noalloc_flags
= (SEC_HAS_CONTENTS
| SEC_IN_MEMORY
1127 | SEC_LINKER_CREATED
| SEC_READONLY
);
1128 flags
= noalloc_flags
| SEC_ALLOC
| SEC_LOAD
;
1130 /* Mark the ".got.plt" section READONLY. */
1131 if (htab
->sgotplt
== NULL
1132 || ! bfd_set_section_flags (dynobj
, htab
->sgotplt
, flags
))
1135 /* Create ".rela.got". */
1136 htab
->srelgot
= bfd_make_section_with_flags (dynobj
, ".rela.got", flags
);
1137 if (htab
->srelgot
== NULL
1138 || ! bfd_set_section_alignment (dynobj
, htab
->srelgot
, 2))
1141 /* Create ".got.loc" (literal tables for use by dynamic linker). */
1142 htab
->sgotloc
= bfd_make_section_with_flags (dynobj
, ".got.loc", flags
);
1143 if (htab
->sgotloc
== NULL
1144 || ! bfd_set_section_alignment (dynobj
, htab
->sgotloc
, 2))
1147 /* Create ".xt.lit.plt" (literal table for ".got.plt*"). */
1148 htab
->spltlittbl
= bfd_make_section_with_flags (dynobj
, ".xt.lit.plt",
1150 if (htab
->spltlittbl
== NULL
1151 || ! bfd_set_section_alignment (dynobj
, htab
->spltlittbl
, 2))
1159 add_extra_plt_sections (struct bfd_link_info
*info
, int count
)
1161 bfd
*dynobj
= elf_hash_table (info
)->dynobj
;
1164 /* Iterate over all chunks except 0 which uses the standard ".plt" and
1165 ".got.plt" sections. */
1166 for (chunk
= count
/ PLT_ENTRIES_PER_CHUNK
; chunk
> 0; chunk
--)
1172 /* Stop when we find a section has already been created. */
1173 if (elf_xtensa_get_plt_section (info
, chunk
))
1176 flags
= (SEC_ALLOC
| SEC_LOAD
| SEC_HAS_CONTENTS
| SEC_IN_MEMORY
1177 | SEC_LINKER_CREATED
| SEC_READONLY
);
1179 sname
= (char *) bfd_malloc (10);
1180 sprintf (sname
, ".plt.%u", chunk
);
1181 s
= bfd_make_section_with_flags (dynobj
, sname
, flags
| SEC_CODE
);
1183 || ! bfd_set_section_alignment (dynobj
, s
, 2))
1186 sname
= (char *) bfd_malloc (14);
1187 sprintf (sname
, ".got.plt.%u", chunk
);
1188 s
= bfd_make_section_with_flags (dynobj
, sname
, flags
);
1190 || ! bfd_set_section_alignment (dynobj
, s
, 2))
1198 /* Adjust a symbol defined by a dynamic object and referenced by a
1199 regular object. The current definition is in some section of the
1200 dynamic object, but we're not including those sections. We have to
1201 change the definition to something the rest of the link can
1205 elf_xtensa_adjust_dynamic_symbol (struct bfd_link_info
*info ATTRIBUTE_UNUSED
,
1206 struct elf_link_hash_entry
*h
)
1208 /* If this is a weak symbol, and there is a real definition, the
1209 processor independent code will have arranged for us to see the
1210 real definition first, and we can just use the same value. */
1213 BFD_ASSERT (h
->u
.weakdef
->root
.type
== bfd_link_hash_defined
1214 || h
->u
.weakdef
->root
.type
== bfd_link_hash_defweak
);
1215 h
->root
.u
.def
.section
= h
->u
.weakdef
->root
.u
.def
.section
;
1216 h
->root
.u
.def
.value
= h
->u
.weakdef
->root
.u
.def
.value
;
1220 /* This is a reference to a symbol defined by a dynamic object. The
1221 reference must go through the GOT, so there's no need for COPY relocs,
1229 elf_xtensa_allocate_dynrelocs (struct elf_link_hash_entry
*h
, void *arg
)
1231 struct bfd_link_info
*info
;
1232 struct elf_xtensa_link_hash_table
*htab
;
1233 bfd_boolean is_dynamic
;
1235 if (h
->root
.type
== bfd_link_hash_indirect
)
1238 if (h
->root
.type
== bfd_link_hash_warning
)
1239 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
1241 info
= (struct bfd_link_info
*) arg
;
1242 htab
= elf_xtensa_hash_table (info
);
1244 is_dynamic
= elf_xtensa_dynamic_symbol_p (h
, info
);
1247 elf_xtensa_make_sym_local (info
, h
);
1249 if (h
->plt
.refcount
> 0)
1250 htab
->srelplt
->size
+= (h
->plt
.refcount
* sizeof (Elf32_External_Rela
));
1252 if (h
->got
.refcount
> 0)
1253 htab
->srelgot
->size
+= (h
->got
.refcount
* sizeof (Elf32_External_Rela
));
1260 elf_xtensa_allocate_local_got_size (struct bfd_link_info
*info
)
1262 struct elf_xtensa_link_hash_table
*htab
;
1265 htab
= elf_xtensa_hash_table (info
);
1267 for (i
= info
->input_bfds
; i
; i
= i
->link_next
)
1269 bfd_signed_vma
*local_got_refcounts
;
1270 bfd_size_type j
, cnt
;
1271 Elf_Internal_Shdr
*symtab_hdr
;
1273 local_got_refcounts
= elf_local_got_refcounts (i
);
1274 if (!local_got_refcounts
)
1277 symtab_hdr
= &elf_tdata (i
)->symtab_hdr
;
1278 cnt
= symtab_hdr
->sh_info
;
1280 for (j
= 0; j
< cnt
; ++j
)
1282 if (local_got_refcounts
[j
] > 0)
1283 htab
->srelgot
->size
+= (local_got_refcounts
[j
]
1284 * sizeof (Elf32_External_Rela
));
1290 /* Set the sizes of the dynamic sections. */
1293 elf_xtensa_size_dynamic_sections (bfd
*output_bfd ATTRIBUTE_UNUSED
,
1294 struct bfd_link_info
*info
)
1296 struct elf_xtensa_link_hash_table
*htab
;
1298 asection
*s
, *srelplt
, *splt
, *sgotplt
, *srelgot
, *spltlittbl
, *sgotloc
;
1299 bfd_boolean relplt
, relgot
;
1300 int plt_entries
, plt_chunks
, chunk
;
1305 htab
= elf_xtensa_hash_table (info
);
1306 dynobj
= elf_hash_table (info
)->dynobj
;
1309 srelgot
= htab
->srelgot
;
1310 srelplt
= htab
->srelplt
;
1312 if (elf_hash_table (info
)->dynamic_sections_created
)
1314 BFD_ASSERT (htab
->srelgot
!= NULL
1315 && htab
->srelplt
!= NULL
1316 && htab
->sgot
!= NULL
1317 && htab
->spltlittbl
!= NULL
1318 && htab
->sgotloc
!= NULL
);
1320 /* Set the contents of the .interp section to the interpreter. */
1321 if (info
->executable
)
1323 s
= bfd_get_section_by_name (dynobj
, ".interp");
1326 s
->size
= sizeof ELF_DYNAMIC_INTERPRETER
;
1327 s
->contents
= (unsigned char *) ELF_DYNAMIC_INTERPRETER
;
1330 /* Allocate room for one word in ".got". */
1331 htab
->sgot
->size
= 4;
1333 /* Allocate space in ".rela.got" for literals that reference global
1334 symbols and space in ".rela.plt" for literals that have PLT
1336 elf_link_hash_traverse (elf_hash_table (info
),
1337 elf_xtensa_allocate_dynrelocs
,
1340 /* If we are generating a shared object, we also need space in
1341 ".rela.got" for R_XTENSA_RELATIVE relocs for literals that
1342 reference local symbols. */
1344 elf_xtensa_allocate_local_got_size (info
);
1346 /* Allocate space in ".plt" to match the size of ".rela.plt". For
1347 each PLT entry, we need the PLT code plus a 4-byte literal.
1348 For each chunk of ".plt", we also need two more 4-byte
1349 literals, two corresponding entries in ".rela.got", and an
1350 8-byte entry in ".xt.lit.plt". */
1351 spltlittbl
= htab
->spltlittbl
;
1352 plt_entries
= srelplt
->size
/ sizeof (Elf32_External_Rela
);
1354 (plt_entries
+ PLT_ENTRIES_PER_CHUNK
- 1) / PLT_ENTRIES_PER_CHUNK
;
1356 /* Iterate over all the PLT chunks, including any extra sections
1357 created earlier because the initial count of PLT relocations
1358 was an overestimate. */
1360 (splt
= elf_xtensa_get_plt_section (info
, chunk
)) != NULL
;
1365 sgotplt
= elf_xtensa_get_gotplt_section (info
, chunk
);
1366 BFD_ASSERT (sgotplt
!= NULL
);
1368 if (chunk
< plt_chunks
- 1)
1369 chunk_entries
= PLT_ENTRIES_PER_CHUNK
;
1370 else if (chunk
== plt_chunks
- 1)
1371 chunk_entries
= plt_entries
- (chunk
* PLT_ENTRIES_PER_CHUNK
);
1375 if (chunk_entries
!= 0)
1377 sgotplt
->size
= 4 * (chunk_entries
+ 2);
1378 splt
->size
= PLT_ENTRY_SIZE
* chunk_entries
;
1379 srelgot
->size
+= 2 * sizeof (Elf32_External_Rela
);
1380 spltlittbl
->size
+= 8;
1389 /* Allocate space in ".got.loc" to match the total size of all the
1391 sgotloc
= htab
->sgotloc
;
1392 sgotloc
->size
= spltlittbl
->size
;
1393 for (abfd
= info
->input_bfds
; abfd
!= NULL
; abfd
= abfd
->link_next
)
1395 if (abfd
->flags
& DYNAMIC
)
1397 for (s
= abfd
->sections
; s
!= NULL
; s
= s
->next
)
1399 if (! elf_discarded_section (s
)
1400 && xtensa_is_littable_section (s
)
1402 sgotloc
->size
+= s
->size
;
1407 /* Allocate memory for dynamic sections. */
1410 for (s
= dynobj
->sections
; s
!= NULL
; s
= s
->next
)
1414 if ((s
->flags
& SEC_LINKER_CREATED
) == 0)
1417 /* It's OK to base decisions on the section name, because none
1418 of the dynobj section names depend upon the input files. */
1419 name
= bfd_get_section_name (dynobj
, s
);
1421 if (CONST_STRNEQ (name
, ".rela"))
1425 if (strcmp (name
, ".rela.plt") == 0)
1427 else if (strcmp (name
, ".rela.got") == 0)
1430 /* We use the reloc_count field as a counter if we need
1431 to copy relocs into the output file. */
1435 else if (! CONST_STRNEQ (name
, ".plt.")
1436 && ! CONST_STRNEQ (name
, ".got.plt.")
1437 && strcmp (name
, ".got") != 0
1438 && strcmp (name
, ".plt") != 0
1439 && strcmp (name
, ".got.plt") != 0
1440 && strcmp (name
, ".xt.lit.plt") != 0
1441 && strcmp (name
, ".got.loc") != 0)
1443 /* It's not one of our sections, so don't allocate space. */
1449 /* If we don't need this section, strip it from the output
1450 file. We must create the ".plt*" and ".got.plt*"
1451 sections in create_dynamic_sections and/or check_relocs
1452 based on a conservative estimate of the PLT relocation
1453 count, because the sections must be created before the
1454 linker maps input sections to output sections. The
1455 linker does that before size_dynamic_sections, where we
1456 compute the exact size of the PLT, so there may be more
1457 of these sections than are actually needed. */
1458 s
->flags
|= SEC_EXCLUDE
;
1460 else if ((s
->flags
& SEC_HAS_CONTENTS
) != 0)
1462 /* Allocate memory for the section contents. */
1463 s
->contents
= (bfd_byte
*) bfd_zalloc (dynobj
, s
->size
);
1464 if (s
->contents
== NULL
)
1469 if (elf_hash_table (info
)->dynamic_sections_created
)
1471 /* Add the special XTENSA_RTLD relocations now. The offsets won't be
1472 known until finish_dynamic_sections, but we need to get the relocs
1473 in place before they are sorted. */
1474 for (chunk
= 0; chunk
< plt_chunks
; chunk
++)
1476 Elf_Internal_Rela irela
;
1480 irela
.r_info
= ELF32_R_INFO (0, R_XTENSA_RTLD
);
1483 loc
= (srelgot
->contents
1484 + srelgot
->reloc_count
* sizeof (Elf32_External_Rela
));
1485 bfd_elf32_swap_reloca_out (output_bfd
, &irela
, loc
);
1486 bfd_elf32_swap_reloca_out (output_bfd
, &irela
,
1487 loc
+ sizeof (Elf32_External_Rela
));
1488 srelgot
->reloc_count
+= 2;
1491 /* Add some entries to the .dynamic section. We fill in the
1492 values later, in elf_xtensa_finish_dynamic_sections, but we
1493 must add the entries now so that we get the correct size for
1494 the .dynamic section. The DT_DEBUG entry is filled in by the
1495 dynamic linker and used by the debugger. */
1496 #define add_dynamic_entry(TAG, VAL) \
1497 _bfd_elf_add_dynamic_entry (info, TAG, VAL)
1499 if (info
->executable
)
1501 if (!add_dynamic_entry (DT_DEBUG
, 0))
1507 if (!add_dynamic_entry (DT_PLTGOT
, 0)
1508 || !add_dynamic_entry (DT_PLTRELSZ
, 0)
1509 || !add_dynamic_entry (DT_PLTREL
, DT_RELA
)
1510 || !add_dynamic_entry (DT_JMPREL
, 0))
1516 if (!add_dynamic_entry (DT_RELA
, 0)
1517 || !add_dynamic_entry (DT_RELASZ
, 0)
1518 || !add_dynamic_entry (DT_RELAENT
, sizeof (Elf32_External_Rela
)))
1522 if (!add_dynamic_entry (DT_XTENSA_GOT_LOC_OFF
, 0)
1523 || !add_dynamic_entry (DT_XTENSA_GOT_LOC_SZ
, 0))
1526 #undef add_dynamic_entry
1532 /* Perform the specified relocation. The instruction at (contents + address)
1533 is modified to set one operand to represent the value in "relocation". The
1534 operand position is determined by the relocation type recorded in the
1537 #define CALL_SEGMENT_BITS (30)
1538 #define CALL_SEGMENT_SIZE (1 << CALL_SEGMENT_BITS)
1540 static bfd_reloc_status_type
1541 elf_xtensa_do_reloc (reloc_howto_type
*howto
,
1543 asection
*input_section
,
1547 bfd_boolean is_weak_undef
,
1548 char **error_message
)
1551 xtensa_opcode opcode
;
1552 xtensa_isa isa
= xtensa_default_isa
;
1553 static xtensa_insnbuf ibuff
= NULL
;
1554 static xtensa_insnbuf sbuff
= NULL
;
1555 bfd_vma self_address
= 0;
1556 bfd_size_type input_size
;
1562 ibuff
= xtensa_insnbuf_alloc (isa
);
1563 sbuff
= xtensa_insnbuf_alloc (isa
);
1566 input_size
= bfd_get_section_limit (abfd
, input_section
);
1568 switch (howto
->type
)
1571 case R_XTENSA_DIFF8
:
1572 case R_XTENSA_DIFF16
:
1573 case R_XTENSA_DIFF32
:
1574 return bfd_reloc_ok
;
1576 case R_XTENSA_ASM_EXPAND
:
1579 /* Check for windowed CALL across a 1GB boundary. */
1580 xtensa_opcode opcode
=
1581 get_expanded_call_opcode (contents
+ address
,
1582 input_size
- address
, 0);
1583 if (is_windowed_call_opcode (opcode
))
1585 self_address
= (input_section
->output_section
->vma
1586 + input_section
->output_offset
1588 if ((self_address
>> CALL_SEGMENT_BITS
)
1589 != (relocation
>> CALL_SEGMENT_BITS
))
1591 *error_message
= "windowed longcall crosses 1GB boundary; "
1593 return bfd_reloc_dangerous
;
1597 return bfd_reloc_ok
;
1599 case R_XTENSA_ASM_SIMPLIFY
:
1601 /* Convert the L32R/CALLX to CALL. */
1602 bfd_reloc_status_type retval
=
1603 elf_xtensa_do_asm_simplify (contents
, address
, input_size
,
1605 if (retval
!= bfd_reloc_ok
)
1606 return bfd_reloc_dangerous
;
1608 /* The CALL needs to be relocated. Continue below for that part. */
1610 howto
= &elf_howto_table
[(unsigned) R_XTENSA_SLOT0_OP
];
1618 x
= bfd_get_32 (abfd
, contents
+ address
);
1620 bfd_put_32 (abfd
, x
, contents
+ address
);
1622 return bfd_reloc_ok
;
1625 /* Only instruction slot-specific relocations handled below.... */
1626 slot
= get_relocation_slot (howto
->type
);
1627 if (slot
== XTENSA_UNDEFINED
)
1629 *error_message
= "unexpected relocation";
1630 return bfd_reloc_dangerous
;
1633 /* Read the instruction into a buffer and decode the opcode. */
1634 xtensa_insnbuf_from_chars (isa
, ibuff
, contents
+ address
,
1635 input_size
- address
);
1636 fmt
= xtensa_format_decode (isa
, ibuff
);
1637 if (fmt
== XTENSA_UNDEFINED
)
1639 *error_message
= "cannot decode instruction format";
1640 return bfd_reloc_dangerous
;
1643 xtensa_format_get_slot (isa
, fmt
, slot
, ibuff
, sbuff
);
1645 opcode
= xtensa_opcode_decode (isa
, fmt
, slot
, sbuff
);
1646 if (opcode
== XTENSA_UNDEFINED
)
1648 *error_message
= "cannot decode instruction opcode";
1649 return bfd_reloc_dangerous
;
1652 /* Check for opcode-specific "alternate" relocations. */
1653 if (is_alt_relocation (howto
->type
))
1655 if (opcode
== get_l32r_opcode ())
1657 /* Handle the special-case of non-PC-relative L32R instructions. */
1658 bfd
*output_bfd
= input_section
->output_section
->owner
;
1659 asection
*lit4_sec
= bfd_get_section_by_name (output_bfd
, ".lit4");
1662 *error_message
= "relocation references missing .lit4 section";
1663 return bfd_reloc_dangerous
;
1665 self_address
= ((lit4_sec
->vma
& ~0xfff)
1666 + 0x40000 - 3); /* -3 to compensate for do_reloc */
1667 newval
= relocation
;
1670 else if (opcode
== get_const16_opcode ())
1672 /* ALT used for high 16 bits. */
1673 newval
= relocation
>> 16;
1678 /* No other "alternate" relocations currently defined. */
1679 *error_message
= "unexpected relocation";
1680 return bfd_reloc_dangerous
;
1683 else /* Not an "alternate" relocation.... */
1685 if (opcode
== get_const16_opcode ())
1687 newval
= relocation
& 0xffff;
1692 /* ...normal PC-relative relocation.... */
1694 /* Determine which operand is being relocated. */
1695 opnd
= get_relocation_opnd (opcode
, howto
->type
);
1696 if (opnd
== XTENSA_UNDEFINED
)
1698 *error_message
= "unexpected relocation";
1699 return bfd_reloc_dangerous
;
1702 if (!howto
->pc_relative
)
1704 *error_message
= "expected PC-relative relocation";
1705 return bfd_reloc_dangerous
;
1708 /* Calculate the PC address for this instruction. */
1709 self_address
= (input_section
->output_section
->vma
1710 + input_section
->output_offset
1713 newval
= relocation
;
1717 /* Apply the relocation. */
1718 if (xtensa_operand_do_reloc (isa
, opcode
, opnd
, &newval
, self_address
)
1719 || xtensa_operand_encode (isa
, opcode
, opnd
, &newval
)
1720 || xtensa_operand_set_field (isa
, opcode
, opnd
, fmt
, slot
,
1723 const char *opname
= xtensa_opcode_name (isa
, opcode
);
1726 msg
= "cannot encode";
1727 if (is_direct_call_opcode (opcode
))
1729 if ((relocation
& 0x3) != 0)
1730 msg
= "misaligned call target";
1732 msg
= "call target out of range";
1734 else if (opcode
== get_l32r_opcode ())
1736 if ((relocation
& 0x3) != 0)
1737 msg
= "misaligned literal target";
1738 else if (is_alt_relocation (howto
->type
))
1739 msg
= "literal target out of range (too many literals)";
1740 else if (self_address
> relocation
)
1741 msg
= "literal target out of range (try using text-section-literals)";
1743 msg
= "literal placed after use";
1746 *error_message
= vsprint_msg (opname
, ": %s", strlen (msg
) + 2, msg
);
1747 return bfd_reloc_dangerous
;
1750 /* Check for calls across 1GB boundaries. */
1751 if (is_direct_call_opcode (opcode
)
1752 && is_windowed_call_opcode (opcode
))
1754 if ((self_address
>> CALL_SEGMENT_BITS
)
1755 != (relocation
>> CALL_SEGMENT_BITS
))
1758 "windowed call crosses 1GB boundary; return may fail";
1759 return bfd_reloc_dangerous
;
1763 /* Write the modified instruction back out of the buffer. */
1764 xtensa_format_set_slot (isa
, fmt
, slot
, ibuff
, sbuff
);
1765 xtensa_insnbuf_to_chars (isa
, ibuff
, contents
+ address
,
1766 input_size
- address
);
1767 return bfd_reloc_ok
;
1772 vsprint_msg (const char *origmsg
, const char *fmt
, int arglen
, ...)
1774 /* To reduce the size of the memory leak,
1775 we only use a single message buffer. */
1776 static bfd_size_type alloc_size
= 0;
1777 static char *message
= NULL
;
1778 bfd_size_type orig_len
, len
= 0;
1779 bfd_boolean is_append
;
1781 VA_OPEN (ap
, arglen
);
1782 VA_FIXEDARG (ap
, const char *, origmsg
);
1784 is_append
= (origmsg
== message
);
1786 orig_len
= strlen (origmsg
);
1787 len
= orig_len
+ strlen (fmt
) + arglen
+ 20;
1788 if (len
> alloc_size
)
1790 message
= (char *) bfd_realloc (message
, len
);
1794 memcpy (message
, origmsg
, orig_len
);
1795 vsprintf (message
+ orig_len
, fmt
, ap
);
1801 /* This function is registered as the "special_function" in the
1802 Xtensa howto for handling simplify operations.
1803 bfd_perform_relocation / bfd_install_relocation use it to
1804 perform (install) the specified relocation. Since this replaces the code
1805 in bfd_perform_relocation, it is basically an Xtensa-specific,
1806 stripped-down version of bfd_perform_relocation. */
1808 static bfd_reloc_status_type
1809 bfd_elf_xtensa_reloc (bfd
*abfd
,
1810 arelent
*reloc_entry
,
1813 asection
*input_section
,
1815 char **error_message
)
1818 bfd_reloc_status_type flag
;
1819 bfd_size_type octets
= reloc_entry
->address
* bfd_octets_per_byte (abfd
);
1820 bfd_vma output_base
= 0;
1821 reloc_howto_type
*howto
= reloc_entry
->howto
;
1822 asection
*reloc_target_output_section
;
1823 bfd_boolean is_weak_undef
;
1825 if (!xtensa_default_isa
)
1826 xtensa_default_isa
= xtensa_isa_init (0, 0);
1828 /* ELF relocs are against symbols. If we are producing relocatable
1829 output, and the reloc is against an external symbol, the resulting
1830 reloc will also be against the same symbol. In such a case, we
1831 don't want to change anything about the way the reloc is handled,
1832 since it will all be done at final link time. This test is similar
1833 to what bfd_elf_generic_reloc does except that it lets relocs with
1834 howto->partial_inplace go through even if the addend is non-zero.
1835 (The real problem is that partial_inplace is set for XTENSA_32
1836 relocs to begin with, but that's a long story and there's little we
1837 can do about it now....) */
1839 if (output_bfd
&& (symbol
->flags
& BSF_SECTION_SYM
) == 0)
1841 reloc_entry
->address
+= input_section
->output_offset
;
1842 return bfd_reloc_ok
;
1845 /* Is the address of the relocation really within the section? */
1846 if (reloc_entry
->address
> bfd_get_section_limit (abfd
, input_section
))
1847 return bfd_reloc_outofrange
;
1849 /* Work out which section the relocation is targeted at and the
1850 initial relocation command value. */
1852 /* Get symbol value. (Common symbols are special.) */
1853 if (bfd_is_com_section (symbol
->section
))
1856 relocation
= symbol
->value
;
1858 reloc_target_output_section
= symbol
->section
->output_section
;
1860 /* Convert input-section-relative symbol value to absolute. */
1861 if ((output_bfd
&& !howto
->partial_inplace
)
1862 || reloc_target_output_section
== NULL
)
1865 output_base
= reloc_target_output_section
->vma
;
1867 relocation
+= output_base
+ symbol
->section
->output_offset
;
1869 /* Add in supplied addend. */
1870 relocation
+= reloc_entry
->addend
;
1872 /* Here the variable relocation holds the final address of the
1873 symbol we are relocating against, plus any addend. */
1876 if (!howto
->partial_inplace
)
1878 /* This is a partial relocation, and we want to apply the relocation
1879 to the reloc entry rather than the raw data. Everything except
1880 relocations against section symbols has already been handled
1883 BFD_ASSERT (symbol
->flags
& BSF_SECTION_SYM
);
1884 reloc_entry
->addend
= relocation
;
1885 reloc_entry
->address
+= input_section
->output_offset
;
1886 return bfd_reloc_ok
;
1890 reloc_entry
->address
+= input_section
->output_offset
;
1891 reloc_entry
->addend
= 0;
1895 is_weak_undef
= (bfd_is_und_section (symbol
->section
)
1896 && (symbol
->flags
& BSF_WEAK
) != 0);
1897 flag
= elf_xtensa_do_reloc (howto
, abfd
, input_section
, relocation
,
1898 (bfd_byte
*) data
, (bfd_vma
) octets
,
1899 is_weak_undef
, error_message
);
1901 if (flag
== bfd_reloc_dangerous
)
1903 /* Add the symbol name to the error message. */
1904 if (! *error_message
)
1905 *error_message
= "";
1906 *error_message
= vsprint_msg (*error_message
, ": (%s + 0x%lx)",
1907 strlen (symbol
->name
) + 17,
1909 (unsigned long) reloc_entry
->addend
);
1916 /* Set up an entry in the procedure linkage table. */
1919 elf_xtensa_create_plt_entry (struct bfd_link_info
*info
,
1921 unsigned reloc_index
)
1923 asection
*splt
, *sgotplt
;
1924 bfd_vma plt_base
, got_base
;
1925 bfd_vma code_offset
, lit_offset
;
1928 chunk
= reloc_index
/ PLT_ENTRIES_PER_CHUNK
;
1929 splt
= elf_xtensa_get_plt_section (info
, chunk
);
1930 sgotplt
= elf_xtensa_get_gotplt_section (info
, chunk
);
1931 BFD_ASSERT (splt
!= NULL
&& sgotplt
!= NULL
);
1933 plt_base
= splt
->output_section
->vma
+ splt
->output_offset
;
1934 got_base
= sgotplt
->output_section
->vma
+ sgotplt
->output_offset
;
1936 lit_offset
= 8 + (reloc_index
% PLT_ENTRIES_PER_CHUNK
) * 4;
1937 code_offset
= (reloc_index
% PLT_ENTRIES_PER_CHUNK
) * PLT_ENTRY_SIZE
;
1939 /* Fill in the literal entry. This is the offset of the dynamic
1940 relocation entry. */
1941 bfd_put_32 (output_bfd
, reloc_index
* sizeof (Elf32_External_Rela
),
1942 sgotplt
->contents
+ lit_offset
);
1944 /* Fill in the entry in the procedure linkage table. */
1945 memcpy (splt
->contents
+ code_offset
,
1946 (bfd_big_endian (output_bfd
)
1947 ? elf_xtensa_be_plt_entry
1948 : elf_xtensa_le_plt_entry
),
1950 bfd_put_16 (output_bfd
, l32r_offset (got_base
+ 0,
1951 plt_base
+ code_offset
+ 3),
1952 splt
->contents
+ code_offset
+ 4);
1953 bfd_put_16 (output_bfd
, l32r_offset (got_base
+ 4,
1954 plt_base
+ code_offset
+ 6),
1955 splt
->contents
+ code_offset
+ 7);
1956 bfd_put_16 (output_bfd
, l32r_offset (got_base
+ lit_offset
,
1957 plt_base
+ code_offset
+ 9),
1958 splt
->contents
+ code_offset
+ 10);
1960 return plt_base
+ code_offset
;
1964 /* Relocate an Xtensa ELF section. This is invoked by the linker for
1965 both relocatable and final links. */
1968 elf_xtensa_relocate_section (bfd
*output_bfd
,
1969 struct bfd_link_info
*info
,
1971 asection
*input_section
,
1973 Elf_Internal_Rela
*relocs
,
1974 Elf_Internal_Sym
*local_syms
,
1975 asection
**local_sections
)
1977 struct elf_xtensa_link_hash_table
*htab
;
1978 Elf_Internal_Shdr
*symtab_hdr
;
1979 Elf_Internal_Rela
*rel
;
1980 Elf_Internal_Rela
*relend
;
1981 struct elf_link_hash_entry
**sym_hashes
;
1982 property_table_entry
*lit_table
= 0;
1984 char *error_message
= NULL
;
1985 bfd_size_type input_size
;
1987 if (!xtensa_default_isa
)
1988 xtensa_default_isa
= xtensa_isa_init (0, 0);
1990 htab
= elf_xtensa_hash_table (info
);
1991 symtab_hdr
= &elf_tdata (input_bfd
)->symtab_hdr
;
1992 sym_hashes
= elf_sym_hashes (input_bfd
);
1994 if (elf_hash_table (info
)->dynamic_sections_created
)
1996 ltblsize
= xtensa_read_table_entries (input_bfd
, input_section
,
1997 &lit_table
, XTENSA_LIT_SEC_NAME
,
2003 input_size
= bfd_get_section_limit (input_bfd
, input_section
);
2006 relend
= relocs
+ input_section
->reloc_count
;
2007 for (; rel
< relend
; rel
++)
2010 reloc_howto_type
*howto
;
2011 unsigned long r_symndx
;
2012 struct elf_link_hash_entry
*h
;
2013 Elf_Internal_Sym
*sym
;
2016 bfd_reloc_status_type r
;
2017 bfd_boolean is_weak_undef
;
2018 bfd_boolean unresolved_reloc
;
2021 r_type
= ELF32_R_TYPE (rel
->r_info
);
2022 if (r_type
== (int) R_XTENSA_GNU_VTINHERIT
2023 || r_type
== (int) R_XTENSA_GNU_VTENTRY
)
2026 if (r_type
< 0 || r_type
>= (int) R_XTENSA_max
)
2028 bfd_set_error (bfd_error_bad_value
);
2031 howto
= &elf_howto_table
[r_type
];
2033 r_symndx
= ELF32_R_SYM (rel
->r_info
);
2038 is_weak_undef
= FALSE
;
2039 unresolved_reloc
= FALSE
;
2042 if (howto
->partial_inplace
&& !info
->relocatable
)
2044 /* Because R_XTENSA_32 was made partial_inplace to fix some
2045 problems with DWARF info in partial links, there may be
2046 an addend stored in the contents. Take it out of there
2047 and move it back into the addend field of the reloc. */
2048 rel
->r_addend
+= bfd_get_32 (input_bfd
, contents
+ rel
->r_offset
);
2049 bfd_put_32 (input_bfd
, 0, contents
+ rel
->r_offset
);
2052 if (r_symndx
< symtab_hdr
->sh_info
)
2054 sym
= local_syms
+ r_symndx
;
2055 sec
= local_sections
[r_symndx
];
2056 relocation
= _bfd_elf_rela_local_sym (output_bfd
, sym
, &sec
, rel
);
2060 RELOC_FOR_GLOBAL_SYMBOL (info
, input_bfd
, input_section
, rel
,
2061 r_symndx
, symtab_hdr
, sym_hashes
,
2063 unresolved_reloc
, warned
);
2066 && !unresolved_reloc
2067 && h
->root
.type
== bfd_link_hash_undefweak
)
2068 is_weak_undef
= TRUE
;
2071 if (sec
!= NULL
&& elf_discarded_section (sec
))
2073 /* For relocs against symbols from removed linkonce sections,
2074 or sections discarded by a linker script, we just want the
2075 section contents zeroed. Avoid any special processing. */
2076 _bfd_clear_contents (howto
, input_bfd
, contents
+ rel
->r_offset
);
2082 if (info
->relocatable
)
2084 /* This is a relocatable link.
2085 1) If the reloc is against a section symbol, adjust
2086 according to the output section.
2087 2) If there is a new target for this relocation,
2088 the new target will be in the same output section.
2089 We adjust the relocation by the output section
2092 if (relaxing_section
)
2094 /* Check if this references a section in another input file. */
2095 if (!do_fix_for_relocatable_link (rel
, input_bfd
, input_section
,
2098 r_type
= ELF32_R_TYPE (rel
->r_info
);
2101 if (r_type
== R_XTENSA_ASM_SIMPLIFY
)
2103 char *error_message
= NULL
;
2104 /* Convert ASM_SIMPLIFY into the simpler relocation
2105 so that they never escape a relaxing link. */
2106 r
= contract_asm_expansion (contents
, input_size
, rel
,
2108 if (r
!= bfd_reloc_ok
)
2110 if (!((*info
->callbacks
->reloc_dangerous
)
2111 (info
, error_message
, input_bfd
, input_section
,
2115 r_type
= ELF32_R_TYPE (rel
->r_info
);
2118 /* This is a relocatable link, so we don't have to change
2119 anything unless the reloc is against a section symbol,
2120 in which case we have to adjust according to where the
2121 section symbol winds up in the output section. */
2122 if (r_symndx
< symtab_hdr
->sh_info
)
2124 sym
= local_syms
+ r_symndx
;
2125 if (ELF_ST_TYPE (sym
->st_info
) == STT_SECTION
)
2127 sec
= local_sections
[r_symndx
];
2128 rel
->r_addend
+= sec
->output_offset
+ sym
->st_value
;
2132 /* If there is an addend with a partial_inplace howto,
2133 then move the addend to the contents. This is a hack
2134 to work around problems with DWARF in relocatable links
2135 with some previous version of BFD. Now we can't easily get
2136 rid of the hack without breaking backward compatibility.... */
2139 howto
= &elf_howto_table
[r_type
];
2140 if (howto
->partial_inplace
)
2142 r
= elf_xtensa_do_reloc (howto
, input_bfd
, input_section
,
2143 rel
->r_addend
, contents
,
2144 rel
->r_offset
, FALSE
,
2146 if (r
!= bfd_reloc_ok
)
2148 if (!((*info
->callbacks
->reloc_dangerous
)
2149 (info
, error_message
, input_bfd
, input_section
,
2157 /* Done with work for relocatable link; continue with next reloc. */
2161 /* This is a final link. */
2163 if (relaxing_section
)
2165 /* Check if this references a section in another input file. */
2166 do_fix_for_final_link (rel
, input_bfd
, input_section
, contents
,
2169 /* Update some already cached values. */
2170 r_type
= ELF32_R_TYPE (rel
->r_info
);
2171 howto
= &elf_howto_table
[r_type
];
2174 /* Sanity check the address. */
2175 if (rel
->r_offset
>= input_size
2176 && ELF32_R_TYPE (rel
->r_info
) != R_XTENSA_NONE
)
2178 (*_bfd_error_handler
)
2179 (_("%B(%A+0x%lx): relocation offset out of range (size=0x%x)"),
2180 input_bfd
, input_section
, rel
->r_offset
, input_size
);
2181 bfd_set_error (bfd_error_bad_value
);
2185 /* Generate dynamic relocations. */
2186 if (elf_hash_table (info
)->dynamic_sections_created
)
2188 bfd_boolean dynamic_symbol
= elf_xtensa_dynamic_symbol_p (h
, info
);
2190 if (dynamic_symbol
&& is_operand_relocation (r_type
))
2192 /* This is an error. The symbol's real value won't be known
2193 until runtime and it's likely to be out of range anyway. */
2194 const char *name
= h
->root
.root
.string
;
2195 error_message
= vsprint_msg ("invalid relocation for dynamic "
2197 strlen (name
) + 2, name
);
2198 if (!((*info
->callbacks
->reloc_dangerous
)
2199 (info
, error_message
, input_bfd
, input_section
,
2203 else if ((r_type
== R_XTENSA_32
|| r_type
== R_XTENSA_PLT
)
2204 && (input_section
->flags
& SEC_ALLOC
) != 0
2205 && (dynamic_symbol
|| info
->shared
))
2207 Elf_Internal_Rela outrel
;
2211 if (dynamic_symbol
&& r_type
== R_XTENSA_PLT
)
2212 srel
= htab
->srelplt
;
2214 srel
= htab
->srelgot
;
2216 BFD_ASSERT (srel
!= NULL
);
2219 _bfd_elf_section_offset (output_bfd
, info
,
2220 input_section
, rel
->r_offset
);
2222 if ((outrel
.r_offset
| 1) == (bfd_vma
) -1)
2223 memset (&outrel
, 0, sizeof outrel
);
2226 outrel
.r_offset
+= (input_section
->output_section
->vma
2227 + input_section
->output_offset
);
2229 /* Complain if the relocation is in a read-only section
2230 and not in a literal pool. */
2231 if ((input_section
->flags
& SEC_READONLY
) != 0
2232 && !elf_xtensa_in_literal_pool (lit_table
, ltblsize
,
2236 _("dynamic relocation in read-only section");
2237 if (!((*info
->callbacks
->reloc_dangerous
)
2238 (info
, error_message
, input_bfd
, input_section
,
2245 outrel
.r_addend
= rel
->r_addend
;
2248 if (r_type
== R_XTENSA_32
)
2251 ELF32_R_INFO (h
->dynindx
, R_XTENSA_GLOB_DAT
);
2254 else /* r_type == R_XTENSA_PLT */
2257 ELF32_R_INFO (h
->dynindx
, R_XTENSA_JMP_SLOT
);
2259 /* Create the PLT entry and set the initial
2260 contents of the literal entry to the address of
2263 elf_xtensa_create_plt_entry (info
, output_bfd
,
2266 unresolved_reloc
= FALSE
;
2270 /* Generate a RELATIVE relocation. */
2271 outrel
.r_info
= ELF32_R_INFO (0, R_XTENSA_RELATIVE
);
2272 outrel
.r_addend
= 0;
2276 loc
= (srel
->contents
2277 + srel
->reloc_count
++ * sizeof (Elf32_External_Rela
));
2278 bfd_elf32_swap_reloca_out (output_bfd
, &outrel
, loc
);
2279 BFD_ASSERT (sizeof (Elf32_External_Rela
) * srel
->reloc_count
2284 /* Dynamic relocs are not propagated for SEC_DEBUGGING sections
2285 because such sections are not SEC_ALLOC and thus ld.so will
2286 not process them. */
2287 if (unresolved_reloc
2288 && !((input_section
->flags
& SEC_DEBUGGING
) != 0
2291 (*_bfd_error_handler
)
2292 (_("%B(%A+0x%lx): unresolvable %s relocation against symbol `%s'"),
2295 (long) rel
->r_offset
,
2297 h
->root
.root
.string
);
2301 /* There's no point in calling bfd_perform_relocation here.
2302 Just go directly to our "special function". */
2303 r
= elf_xtensa_do_reloc (howto
, input_bfd
, input_section
,
2304 relocation
+ rel
->r_addend
,
2305 contents
, rel
->r_offset
, is_weak_undef
,
2308 if (r
!= bfd_reloc_ok
&& !warned
)
2312 BFD_ASSERT (r
== bfd_reloc_dangerous
|| r
== bfd_reloc_other
);
2313 BFD_ASSERT (error_message
!= NULL
);
2316 name
= h
->root
.root
.string
;
2319 name
= bfd_elf_string_from_elf_section
2320 (input_bfd
, symtab_hdr
->sh_link
, sym
->st_name
);
2321 if (name
&& *name
== '\0')
2322 name
= bfd_section_name (input_bfd
, sec
);
2326 if (rel
->r_addend
== 0)
2327 error_message
= vsprint_msg (error_message
, ": %s",
2328 strlen (name
) + 2, name
);
2330 error_message
= vsprint_msg (error_message
, ": (%s+0x%x)",
2332 name
, (int)rel
->r_addend
);
2335 if (!((*info
->callbacks
->reloc_dangerous
)
2336 (info
, error_message
, input_bfd
, input_section
,
2345 input_section
->reloc_done
= TRUE
;
2351 /* Finish up dynamic symbol handling. There's not much to do here since
2352 the PLT and GOT entries are all set up by relocate_section. */
2355 elf_xtensa_finish_dynamic_symbol (bfd
*output_bfd ATTRIBUTE_UNUSED
,
2356 struct bfd_link_info
*info ATTRIBUTE_UNUSED
,
2357 struct elf_link_hash_entry
*h
,
2358 Elf_Internal_Sym
*sym
)
2360 if (h
->needs_plt
&& !h
->def_regular
)
2362 /* Mark the symbol as undefined, rather than as defined in
2363 the .plt section. Leave the value alone. */
2364 sym
->st_shndx
= SHN_UNDEF
;
2365 /* If the symbol is weak, we do need to clear the value.
2366 Otherwise, the PLT entry would provide a definition for
2367 the symbol even if the symbol wasn't defined anywhere,
2368 and so the symbol would never be NULL. */
2369 if (!h
->ref_regular_nonweak
)
2373 /* Mark _DYNAMIC and _GLOBAL_OFFSET_TABLE_ as absolute. */
2374 if (strcmp (h
->root
.root
.string
, "_DYNAMIC") == 0
2375 || h
== elf_hash_table (info
)->hgot
)
2376 sym
->st_shndx
= SHN_ABS
;
2382 /* Combine adjacent literal table entries in the output. Adjacent
2383 entries within each input section may have been removed during
2384 relaxation, but we repeat the process here, even though it's too late
2385 to shrink the output section, because it's important to minimize the
2386 number of literal table entries to reduce the start-up work for the
2387 runtime linker. Returns the number of remaining table entries or -1
2391 elf_xtensa_combine_prop_entries (bfd
*output_bfd
,
2396 property_table_entry
*table
;
2397 bfd_size_type section_size
, sgotloc_size
;
2401 section_size
= sxtlit
->size
;
2402 BFD_ASSERT (section_size
% 8 == 0);
2403 num
= section_size
/ 8;
2405 sgotloc_size
= sgotloc
->size
;
2406 if (sgotloc_size
!= section_size
)
2408 (*_bfd_error_handler
)
2409 (_("internal inconsistency in size of .got.loc section"));
2413 table
= bfd_malloc (num
* sizeof (property_table_entry
));
2417 /* The ".xt.lit.plt" section has the SEC_IN_MEMORY flag set and this
2418 propagates to the output section, where it doesn't really apply and
2419 where it breaks the following call to bfd_malloc_and_get_section. */
2420 sxtlit
->flags
&= ~SEC_IN_MEMORY
;
2422 if (!bfd_malloc_and_get_section (output_bfd
, sxtlit
, &contents
))
2430 /* There should never be any relocations left at this point, so this
2431 is quite a bit easier than what is done during relaxation. */
2433 /* Copy the raw contents into a property table array and sort it. */
2435 for (n
= 0; n
< num
; n
++)
2437 table
[n
].address
= bfd_get_32 (output_bfd
, &contents
[offset
]);
2438 table
[n
].size
= bfd_get_32 (output_bfd
, &contents
[offset
+ 4]);
2441 qsort (table
, num
, sizeof (property_table_entry
), property_table_compare
);
2443 for (n
= 0; n
< num
; n
++)
2445 bfd_boolean remove
= FALSE
;
2447 if (table
[n
].size
== 0)
2450 (table
[n
-1].address
+ table
[n
-1].size
== table
[n
].address
))
2452 table
[n
-1].size
+= table
[n
].size
;
2458 for (m
= n
; m
< num
- 1; m
++)
2460 table
[m
].address
= table
[m
+1].address
;
2461 table
[m
].size
= table
[m
+1].size
;
2469 /* Copy the data back to the raw contents. */
2471 for (n
= 0; n
< num
; n
++)
2473 bfd_put_32 (output_bfd
, table
[n
].address
, &contents
[offset
]);
2474 bfd_put_32 (output_bfd
, table
[n
].size
, &contents
[offset
+ 4]);
2478 /* Clear the removed bytes. */
2479 if ((bfd_size_type
) (num
* 8) < section_size
)
2480 memset (&contents
[num
* 8], 0, section_size
- num
* 8);
2482 if (! bfd_set_section_contents (output_bfd
, sxtlit
, contents
, 0,
2486 /* Copy the contents to ".got.loc". */
2487 memcpy (sgotloc
->contents
, contents
, section_size
);
2495 /* Finish up the dynamic sections. */
2498 elf_xtensa_finish_dynamic_sections (bfd
*output_bfd
,
2499 struct bfd_link_info
*info
)
2501 struct elf_xtensa_link_hash_table
*htab
;
2503 asection
*sdyn
, *srelplt
, *sgot
, *sxtlit
, *sgotloc
;
2504 Elf32_External_Dyn
*dyncon
, *dynconend
;
2505 int num_xtlit_entries
;
2507 if (! elf_hash_table (info
)->dynamic_sections_created
)
2510 htab
= elf_xtensa_hash_table (info
);
2511 dynobj
= elf_hash_table (info
)->dynobj
;
2512 sdyn
= bfd_get_section_by_name (dynobj
, ".dynamic");
2513 BFD_ASSERT (sdyn
!= NULL
);
2515 /* Set the first entry in the global offset table to the address of
2516 the dynamic section. */
2520 BFD_ASSERT (sgot
->size
== 4);
2522 bfd_put_32 (output_bfd
, 0, sgot
->contents
);
2524 bfd_put_32 (output_bfd
,
2525 sdyn
->output_section
->vma
+ sdyn
->output_offset
,
2529 srelplt
= htab
->srelplt
;
2530 if (srelplt
&& srelplt
->size
!= 0)
2532 asection
*sgotplt
, *srelgot
, *spltlittbl
;
2533 int chunk
, plt_chunks
, plt_entries
;
2534 Elf_Internal_Rela irela
;
2536 unsigned rtld_reloc
;
2538 srelgot
= htab
->srelgot
;
2539 spltlittbl
= htab
->spltlittbl
;
2540 BFD_ASSERT (srelgot
!= NULL
&& spltlittbl
!= NULL
);
2542 /* Find the first XTENSA_RTLD relocation. Presumably the rest
2543 of them follow immediately after.... */
2544 for (rtld_reloc
= 0; rtld_reloc
< srelgot
->reloc_count
; rtld_reloc
++)
2546 loc
= srelgot
->contents
+ rtld_reloc
* sizeof (Elf32_External_Rela
);
2547 bfd_elf32_swap_reloca_in (output_bfd
, loc
, &irela
);
2548 if (ELF32_R_TYPE (irela
.r_info
) == R_XTENSA_RTLD
)
2551 BFD_ASSERT (rtld_reloc
< srelgot
->reloc_count
);
2553 plt_entries
= srelplt
->size
/ sizeof (Elf32_External_Rela
);
2555 (plt_entries
+ PLT_ENTRIES_PER_CHUNK
- 1) / PLT_ENTRIES_PER_CHUNK
;
2557 for (chunk
= 0; chunk
< plt_chunks
; chunk
++)
2559 int chunk_entries
= 0;
2561 sgotplt
= elf_xtensa_get_gotplt_section (info
, chunk
);
2562 BFD_ASSERT (sgotplt
!= NULL
);
2564 /* Emit special RTLD relocations for the first two entries in
2565 each chunk of the .got.plt section. */
2567 loc
= srelgot
->contents
+ rtld_reloc
* sizeof (Elf32_External_Rela
);
2568 bfd_elf32_swap_reloca_in (output_bfd
, loc
, &irela
);
2569 BFD_ASSERT (ELF32_R_TYPE (irela
.r_info
) == R_XTENSA_RTLD
);
2570 irela
.r_offset
= (sgotplt
->output_section
->vma
2571 + sgotplt
->output_offset
);
2572 irela
.r_addend
= 1; /* tell rtld to set value to resolver function */
2573 bfd_elf32_swap_reloca_out (output_bfd
, &irela
, loc
);
2575 BFD_ASSERT (rtld_reloc
<= srelgot
->reloc_count
);
2577 /* Next literal immediately follows the first. */
2578 loc
+= sizeof (Elf32_External_Rela
);
2579 bfd_elf32_swap_reloca_in (output_bfd
, loc
, &irela
);
2580 BFD_ASSERT (ELF32_R_TYPE (irela
.r_info
) == R_XTENSA_RTLD
);
2581 irela
.r_offset
= (sgotplt
->output_section
->vma
2582 + sgotplt
->output_offset
+ 4);
2583 /* Tell rtld to set value to object's link map. */
2585 bfd_elf32_swap_reloca_out (output_bfd
, &irela
, loc
);
2587 BFD_ASSERT (rtld_reloc
<= srelgot
->reloc_count
);
2589 /* Fill in the literal table. */
2590 if (chunk
< plt_chunks
- 1)
2591 chunk_entries
= PLT_ENTRIES_PER_CHUNK
;
2593 chunk_entries
= plt_entries
- (chunk
* PLT_ENTRIES_PER_CHUNK
);
2595 BFD_ASSERT ((unsigned) (chunk
+ 1) * 8 <= spltlittbl
->size
);
2596 bfd_put_32 (output_bfd
,
2597 sgotplt
->output_section
->vma
+ sgotplt
->output_offset
,
2598 spltlittbl
->contents
+ (chunk
* 8) + 0);
2599 bfd_put_32 (output_bfd
,
2600 8 + (chunk_entries
* 4),
2601 spltlittbl
->contents
+ (chunk
* 8) + 4);
2604 /* All the dynamic relocations have been emitted at this point.
2605 Make sure the relocation sections are the correct size. */
2606 if (srelgot
->size
!= (sizeof (Elf32_External_Rela
)
2607 * srelgot
->reloc_count
)
2608 || srelplt
->size
!= (sizeof (Elf32_External_Rela
)
2609 * srelplt
->reloc_count
))
2612 /* The .xt.lit.plt section has just been modified. This must
2613 happen before the code below which combines adjacent literal
2614 table entries, and the .xt.lit.plt contents have to be forced to
2616 if (! bfd_set_section_contents (output_bfd
,
2617 spltlittbl
->output_section
,
2618 spltlittbl
->contents
,
2619 spltlittbl
->output_offset
,
2622 /* Clear SEC_HAS_CONTENTS so the contents won't be output again. */
2623 spltlittbl
->flags
&= ~SEC_HAS_CONTENTS
;
2626 /* Combine adjacent literal table entries. */
2627 BFD_ASSERT (! info
->relocatable
);
2628 sxtlit
= bfd_get_section_by_name (output_bfd
, ".xt.lit");
2629 sgotloc
= htab
->sgotloc
;
2630 BFD_ASSERT (sxtlit
&& sgotloc
);
2632 elf_xtensa_combine_prop_entries (output_bfd
, sxtlit
, sgotloc
);
2633 if (num_xtlit_entries
< 0)
2636 dyncon
= (Elf32_External_Dyn
*) sdyn
->contents
;
2637 dynconend
= (Elf32_External_Dyn
*) (sdyn
->contents
+ sdyn
->size
);
2638 for (; dyncon
< dynconend
; dyncon
++)
2640 Elf_Internal_Dyn dyn
;
2642 bfd_elf32_swap_dyn_in (dynobj
, dyncon
, &dyn
);
2649 case DT_XTENSA_GOT_LOC_SZ
:
2650 dyn
.d_un
.d_val
= num_xtlit_entries
;
2653 case DT_XTENSA_GOT_LOC_OFF
:
2654 dyn
.d_un
.d_ptr
= htab
->sgotloc
->output_section
->vma
;
2658 dyn
.d_un
.d_ptr
= htab
->sgot
->output_section
->vma
;
2662 dyn
.d_un
.d_ptr
= htab
->srelplt
->output_section
->vma
;
2666 dyn
.d_un
.d_val
= htab
->srelplt
->output_section
->size
;
2670 /* Adjust RELASZ to not include JMPREL. This matches what
2671 glibc expects and what is done for several other ELF
2672 targets (e.g., i386, alpha), but the "correct" behavior
2673 seems to be unresolved. Since the linker script arranges
2674 for .rela.plt to follow all other relocation sections, we
2675 don't have to worry about changing the DT_RELA entry. */
2677 dyn
.d_un
.d_val
-= htab
->srelplt
->output_section
->size
;
2681 bfd_elf32_swap_dyn_out (output_bfd
, &dyn
, dyncon
);
2688 /* Functions for dealing with the e_flags field. */
2690 /* Merge backend specific data from an object file to the output
2691 object file when linking. */
2694 elf_xtensa_merge_private_bfd_data (bfd
*ibfd
, bfd
*obfd
)
2696 unsigned out_mach
, in_mach
;
2697 flagword out_flag
, in_flag
;
2699 /* Check if we have the same endianess. */
2700 if (!_bfd_generic_verify_endian_match (ibfd
, obfd
))
2703 /* Don't even pretend to support mixed-format linking. */
2704 if (bfd_get_flavour (ibfd
) != bfd_target_elf_flavour
2705 || bfd_get_flavour (obfd
) != bfd_target_elf_flavour
)
2708 out_flag
= elf_elfheader (obfd
)->e_flags
;
2709 in_flag
= elf_elfheader (ibfd
)->e_flags
;
2711 out_mach
= out_flag
& EF_XTENSA_MACH
;
2712 in_mach
= in_flag
& EF_XTENSA_MACH
;
2713 if (out_mach
!= in_mach
)
2715 (*_bfd_error_handler
)
2716 (_("%B: incompatible machine type. Output is 0x%x. Input is 0x%x"),
2717 ibfd
, out_mach
, in_mach
);
2718 bfd_set_error (bfd_error_wrong_format
);
2722 if (! elf_flags_init (obfd
))
2724 elf_flags_init (obfd
) = TRUE
;
2725 elf_elfheader (obfd
)->e_flags
= in_flag
;
2727 if (bfd_get_arch (obfd
) == bfd_get_arch (ibfd
)
2728 && bfd_get_arch_info (obfd
)->the_default
)
2729 return bfd_set_arch_mach (obfd
, bfd_get_arch (ibfd
),
2730 bfd_get_mach (ibfd
));
2735 if ((out_flag
& EF_XTENSA_XT_INSN
) != (in_flag
& EF_XTENSA_XT_INSN
))
2736 elf_elfheader (obfd
)->e_flags
&= (~ EF_XTENSA_XT_INSN
);
2738 if ((out_flag
& EF_XTENSA_XT_LIT
) != (in_flag
& EF_XTENSA_XT_LIT
))
2739 elf_elfheader (obfd
)->e_flags
&= (~ EF_XTENSA_XT_LIT
);
2746 elf_xtensa_set_private_flags (bfd
*abfd
, flagword flags
)
2748 BFD_ASSERT (!elf_flags_init (abfd
)
2749 || elf_elfheader (abfd
)->e_flags
== flags
);
2751 elf_elfheader (abfd
)->e_flags
|= flags
;
2752 elf_flags_init (abfd
) = TRUE
;
2759 elf_xtensa_print_private_bfd_data (bfd
*abfd
, void *farg
)
2761 FILE *f
= (FILE *) farg
;
2762 flagword e_flags
= elf_elfheader (abfd
)->e_flags
;
2764 fprintf (f
, "\nXtensa header:\n");
2765 if ((e_flags
& EF_XTENSA_MACH
) == E_XTENSA_MACH
)
2766 fprintf (f
, "\nMachine = Base\n");
2768 fprintf (f
, "\nMachine Id = 0x%x\n", e_flags
& EF_XTENSA_MACH
);
2770 fprintf (f
, "Insn tables = %s\n",
2771 (e_flags
& EF_XTENSA_XT_INSN
) ? "true" : "false");
2773 fprintf (f
, "Literal tables = %s\n",
2774 (e_flags
& EF_XTENSA_XT_LIT
) ? "true" : "false");
2776 return _bfd_elf_print_private_bfd_data (abfd
, farg
);
2780 /* Set the right machine number for an Xtensa ELF file. */
2783 elf_xtensa_object_p (bfd
*abfd
)
2786 unsigned long arch
= elf_elfheader (abfd
)->e_flags
& EF_XTENSA_MACH
;
2791 mach
= bfd_mach_xtensa
;
2797 (void) bfd_default_set_arch_mach (abfd
, bfd_arch_xtensa
, mach
);
2802 /* The final processing done just before writing out an Xtensa ELF object
2803 file. This gets the Xtensa architecture right based on the machine
2807 elf_xtensa_final_write_processing (bfd
*abfd
,
2808 bfd_boolean linker ATTRIBUTE_UNUSED
)
2813 switch (mach
= bfd_get_mach (abfd
))
2815 case bfd_mach_xtensa
:
2816 val
= E_XTENSA_MACH
;
2822 elf_elfheader (abfd
)->e_flags
&= (~ EF_XTENSA_MACH
);
2823 elf_elfheader (abfd
)->e_flags
|= val
;
2827 static enum elf_reloc_type_class
2828 elf_xtensa_reloc_type_class (const Elf_Internal_Rela
*rela
)
2830 switch ((int) ELF32_R_TYPE (rela
->r_info
))
2832 case R_XTENSA_RELATIVE
:
2833 return reloc_class_relative
;
2834 case R_XTENSA_JMP_SLOT
:
2835 return reloc_class_plt
;
2837 return reloc_class_normal
;
2843 elf_xtensa_discard_info_for_section (bfd
*abfd
,
2844 struct elf_reloc_cookie
*cookie
,
2845 struct bfd_link_info
*info
,
2849 bfd_vma section_size
;
2850 bfd_vma offset
, actual_offset
;
2851 bfd_size_type removed_bytes
= 0;
2852 bfd_size_type entry_size
;
2854 if (sec
->output_section
2855 && bfd_is_abs_section (sec
->output_section
))
2858 if (xtensa_is_proptable_section (sec
))
2863 section_size
= sec
->size
;
2864 if (section_size
== 0 || section_size
% entry_size
!= 0)
2867 contents
= retrieve_contents (abfd
, sec
, info
->keep_memory
);
2871 cookie
->rels
= retrieve_internal_relocs (abfd
, sec
, info
->keep_memory
);
2874 release_contents (sec
, contents
);
2878 /* Sort the relocations. They should already be in order when
2879 relaxation is enabled, but it might not be. */
2880 qsort (cookie
->rels
, sec
->reloc_count
, sizeof (Elf_Internal_Rela
),
2881 internal_reloc_compare
);
2883 cookie
->rel
= cookie
->rels
;
2884 cookie
->relend
= cookie
->rels
+ sec
->reloc_count
;
2886 for (offset
= 0; offset
< section_size
; offset
+= entry_size
)
2888 actual_offset
= offset
- removed_bytes
;
2890 /* The ...symbol_deleted_p function will skip over relocs but it
2891 won't adjust their offsets, so do that here. */
2892 while (cookie
->rel
< cookie
->relend
2893 && cookie
->rel
->r_offset
< offset
)
2895 cookie
->rel
->r_offset
-= removed_bytes
;
2899 while (cookie
->rel
< cookie
->relend
2900 && cookie
->rel
->r_offset
== offset
)
2902 if (bfd_elf_reloc_symbol_deleted_p (offset
, cookie
))
2904 /* Remove the table entry. (If the reloc type is NONE, then
2905 the entry has already been merged with another and deleted
2906 during relaxation.) */
2907 if (ELF32_R_TYPE (cookie
->rel
->r_info
) != R_XTENSA_NONE
)
2909 /* Shift the contents up. */
2910 if (offset
+ entry_size
< section_size
)
2911 memmove (&contents
[actual_offset
],
2912 &contents
[actual_offset
+ entry_size
],
2913 section_size
- offset
- entry_size
);
2914 removed_bytes
+= entry_size
;
2917 /* Remove this relocation. */
2918 cookie
->rel
->r_info
= ELF32_R_INFO (0, R_XTENSA_NONE
);
2921 /* Adjust the relocation offset for previous removals. This
2922 should not be done before calling ...symbol_deleted_p
2923 because it might mess up the offset comparisons there.
2924 Make sure the offset doesn't underflow in the case where
2925 the first entry is removed. */
2926 if (cookie
->rel
->r_offset
>= removed_bytes
)
2927 cookie
->rel
->r_offset
-= removed_bytes
;
2929 cookie
->rel
->r_offset
= 0;
2935 if (removed_bytes
!= 0)
2937 /* Adjust any remaining relocs (shouldn't be any). */
2938 for (; cookie
->rel
< cookie
->relend
; cookie
->rel
++)
2940 if (cookie
->rel
->r_offset
>= removed_bytes
)
2941 cookie
->rel
->r_offset
-= removed_bytes
;
2943 cookie
->rel
->r_offset
= 0;
2946 /* Clear the removed bytes. */
2947 memset (&contents
[section_size
- removed_bytes
], 0, removed_bytes
);
2949 pin_contents (sec
, contents
);
2950 pin_internal_relocs (sec
, cookie
->rels
);
2953 sec
->size
= section_size
- removed_bytes
;
2955 if (xtensa_is_littable_section (sec
))
2957 asection
*sgotloc
= elf_xtensa_hash_table (info
)->sgotloc
;
2959 sgotloc
->size
-= removed_bytes
;
2964 release_contents (sec
, contents
);
2965 release_internal_relocs (sec
, cookie
->rels
);
2968 return (removed_bytes
!= 0);
2973 elf_xtensa_discard_info (bfd
*abfd
,
2974 struct elf_reloc_cookie
*cookie
,
2975 struct bfd_link_info
*info
)
2978 bfd_boolean changed
= FALSE
;
2980 for (sec
= abfd
->sections
; sec
!= NULL
; sec
= sec
->next
)
2982 if (xtensa_is_property_section (sec
))
2984 if (elf_xtensa_discard_info_for_section (abfd
, cookie
, info
, sec
))
2994 elf_xtensa_ignore_discarded_relocs (asection
*sec
)
2996 return xtensa_is_property_section (sec
);
3001 elf_xtensa_action_discarded (asection
*sec
)
3003 if (strcmp (".xt_except_table", sec
->name
) == 0)
3006 if (strcmp (".xt_except_desc", sec
->name
) == 0)
3009 return _bfd_elf_default_action_discarded (sec
);
3013 /* Support for core dump NOTE sections. */
3016 elf_xtensa_grok_prstatus (bfd
*abfd
, Elf_Internal_Note
*note
)
3021 /* The size for Xtensa is variable, so don't try to recognize the format
3022 based on the size. Just assume this is GNU/Linux. */
3025 elf_tdata (abfd
)->core_signal
= bfd_get_16 (abfd
, note
->descdata
+ 12);
3028 elf_tdata (abfd
)->core_pid
= bfd_get_32 (abfd
, note
->descdata
+ 24);
3032 size
= note
->descsz
- offset
- 4;
3034 /* Make a ".reg/999" section. */
3035 return _bfd_elfcore_make_pseudosection (abfd
, ".reg",
3036 size
, note
->descpos
+ offset
);
3041 elf_xtensa_grok_psinfo (bfd
*abfd
, Elf_Internal_Note
*note
)
3043 switch (note
->descsz
)
3048 case 128: /* GNU/Linux elf_prpsinfo */
3049 elf_tdata (abfd
)->core_program
3050 = _bfd_elfcore_strndup (abfd
, note
->descdata
+ 32, 16);
3051 elf_tdata (abfd
)->core_command
3052 = _bfd_elfcore_strndup (abfd
, note
->descdata
+ 48, 80);
3055 /* Note that for some reason, a spurious space is tacked
3056 onto the end of the args in some (at least one anyway)
3057 implementations, so strip it off if it exists. */
3060 char *command
= elf_tdata (abfd
)->core_command
;
3061 int n
= strlen (command
);
3063 if (0 < n
&& command
[n
- 1] == ' ')
3064 command
[n
- 1] = '\0';
3071 /* Generic Xtensa configurability stuff. */
3073 static xtensa_opcode callx0_op
= XTENSA_UNDEFINED
;
3074 static xtensa_opcode callx4_op
= XTENSA_UNDEFINED
;
3075 static xtensa_opcode callx8_op
= XTENSA_UNDEFINED
;
3076 static xtensa_opcode callx12_op
= XTENSA_UNDEFINED
;
3077 static xtensa_opcode call0_op
= XTENSA_UNDEFINED
;
3078 static xtensa_opcode call4_op
= XTENSA_UNDEFINED
;
3079 static xtensa_opcode call8_op
= XTENSA_UNDEFINED
;
3080 static xtensa_opcode call12_op
= XTENSA_UNDEFINED
;
3083 init_call_opcodes (void)
3085 if (callx0_op
== XTENSA_UNDEFINED
)
3087 callx0_op
= xtensa_opcode_lookup (xtensa_default_isa
, "callx0");
3088 callx4_op
= xtensa_opcode_lookup (xtensa_default_isa
, "callx4");
3089 callx8_op
= xtensa_opcode_lookup (xtensa_default_isa
, "callx8");
3090 callx12_op
= xtensa_opcode_lookup (xtensa_default_isa
, "callx12");
3091 call0_op
= xtensa_opcode_lookup (xtensa_default_isa
, "call0");
3092 call4_op
= xtensa_opcode_lookup (xtensa_default_isa
, "call4");
3093 call8_op
= xtensa_opcode_lookup (xtensa_default_isa
, "call8");
3094 call12_op
= xtensa_opcode_lookup (xtensa_default_isa
, "call12");
3100 is_indirect_call_opcode (xtensa_opcode opcode
)
3102 init_call_opcodes ();
3103 return (opcode
== callx0_op
3104 || opcode
== callx4_op
3105 || opcode
== callx8_op
3106 || opcode
== callx12_op
);
3111 is_direct_call_opcode (xtensa_opcode opcode
)
3113 init_call_opcodes ();
3114 return (opcode
== call0_op
3115 || opcode
== call4_op
3116 || opcode
== call8_op
3117 || opcode
== call12_op
);
3122 is_windowed_call_opcode (xtensa_opcode opcode
)
3124 init_call_opcodes ();
3125 return (opcode
== call4_op
3126 || opcode
== call8_op
3127 || opcode
== call12_op
3128 || opcode
== callx4_op
3129 || opcode
== callx8_op
3130 || opcode
== callx12_op
);
3134 static xtensa_opcode
3135 get_const16_opcode (void)
3137 static bfd_boolean done_lookup
= FALSE
;
3138 static xtensa_opcode const16_opcode
= XTENSA_UNDEFINED
;
3141 const16_opcode
= xtensa_opcode_lookup (xtensa_default_isa
, "const16");
3144 return const16_opcode
;
3148 static xtensa_opcode
3149 get_l32r_opcode (void)
3151 static xtensa_opcode l32r_opcode
= XTENSA_UNDEFINED
;
3152 static bfd_boolean done_lookup
= FALSE
;
3156 l32r_opcode
= xtensa_opcode_lookup (xtensa_default_isa
, "l32r");
3164 l32r_offset (bfd_vma addr
, bfd_vma pc
)
3168 offset
= addr
- ((pc
+3) & -4);
3169 BFD_ASSERT ((offset
& ((1 << 2) - 1)) == 0);
3170 offset
= (signed int) offset
>> 2;
3171 BFD_ASSERT ((signed int) offset
>> 16 == -1);
3177 get_relocation_opnd (xtensa_opcode opcode
, int r_type
)
3179 xtensa_isa isa
= xtensa_default_isa
;
3180 int last_immed
, last_opnd
, opi
;
3182 if (opcode
== XTENSA_UNDEFINED
)
3183 return XTENSA_UNDEFINED
;
3185 /* Find the last visible PC-relative immediate operand for the opcode.
3186 If there are no PC-relative immediates, then choose the last visible
3187 immediate; otherwise, fail and return XTENSA_UNDEFINED. */
3188 last_immed
= XTENSA_UNDEFINED
;
3189 last_opnd
= xtensa_opcode_num_operands (isa
, opcode
);
3190 for (opi
= last_opnd
- 1; opi
>= 0; opi
--)
3192 if (xtensa_operand_is_visible (isa
, opcode
, opi
) == 0)
3194 if (xtensa_operand_is_PCrelative (isa
, opcode
, opi
) == 1)
3199 if (last_immed
== XTENSA_UNDEFINED
3200 && xtensa_operand_is_register (isa
, opcode
, opi
) == 0)
3204 return XTENSA_UNDEFINED
;
3206 /* If the operand number was specified in an old-style relocation,
3207 check for consistency with the operand computed above. */
3208 if (r_type
>= R_XTENSA_OP0
&& r_type
<= R_XTENSA_OP2
)
3210 int reloc_opnd
= r_type
- R_XTENSA_OP0
;
3211 if (reloc_opnd
!= last_immed
)
3212 return XTENSA_UNDEFINED
;
3220 get_relocation_slot (int r_type
)
3230 if (r_type
>= R_XTENSA_SLOT0_OP
&& r_type
<= R_XTENSA_SLOT14_OP
)
3231 return r_type
- R_XTENSA_SLOT0_OP
;
3232 if (r_type
>= R_XTENSA_SLOT0_ALT
&& r_type
<= R_XTENSA_SLOT14_ALT
)
3233 return r_type
- R_XTENSA_SLOT0_ALT
;
3237 return XTENSA_UNDEFINED
;
3241 /* Get the opcode for a relocation. */
3243 static xtensa_opcode
3244 get_relocation_opcode (bfd
*abfd
,
3247 Elf_Internal_Rela
*irel
)
3249 static xtensa_insnbuf ibuff
= NULL
;
3250 static xtensa_insnbuf sbuff
= NULL
;
3251 xtensa_isa isa
= xtensa_default_isa
;
3255 if (contents
== NULL
)
3256 return XTENSA_UNDEFINED
;
3258 if (bfd_get_section_limit (abfd
, sec
) <= irel
->r_offset
)
3259 return XTENSA_UNDEFINED
;
3263 ibuff
= xtensa_insnbuf_alloc (isa
);
3264 sbuff
= xtensa_insnbuf_alloc (isa
);
3267 /* Decode the instruction. */
3268 xtensa_insnbuf_from_chars (isa
, ibuff
, &contents
[irel
->r_offset
],
3269 sec
->size
- irel
->r_offset
);
3270 fmt
= xtensa_format_decode (isa
, ibuff
);
3271 slot
= get_relocation_slot (ELF32_R_TYPE (irel
->r_info
));
3272 if (slot
== XTENSA_UNDEFINED
)
3273 return XTENSA_UNDEFINED
;
3274 xtensa_format_get_slot (isa
, fmt
, slot
, ibuff
, sbuff
);
3275 return xtensa_opcode_decode (isa
, fmt
, slot
, sbuff
);
3280 is_l32r_relocation (bfd
*abfd
,
3283 Elf_Internal_Rela
*irel
)
3285 xtensa_opcode opcode
;
3286 if (!is_operand_relocation (ELF32_R_TYPE (irel
->r_info
)))
3288 opcode
= get_relocation_opcode (abfd
, sec
, contents
, irel
);
3289 return (opcode
== get_l32r_opcode ());
3293 static bfd_size_type
3294 get_asm_simplify_size (bfd_byte
*contents
,
3295 bfd_size_type content_len
,
3296 bfd_size_type offset
)
3298 bfd_size_type insnlen
, size
= 0;
3300 /* Decode the size of the next two instructions. */
3301 insnlen
= insn_decode_len (contents
, content_len
, offset
);
3307 insnlen
= insn_decode_len (contents
, content_len
, offset
+ size
);
3317 is_alt_relocation (int r_type
)
3319 return (r_type
>= R_XTENSA_SLOT0_ALT
3320 && r_type
<= R_XTENSA_SLOT14_ALT
);
3325 is_operand_relocation (int r_type
)
3335 if (r_type
>= R_XTENSA_SLOT0_OP
&& r_type
<= R_XTENSA_SLOT14_OP
)
3337 if (r_type
>= R_XTENSA_SLOT0_ALT
&& r_type
<= R_XTENSA_SLOT14_ALT
)
3346 #define MIN_INSN_LENGTH 2
3348 /* Return 0 if it fails to decode. */
3351 insn_decode_len (bfd_byte
*contents
,
3352 bfd_size_type content_len
,
3353 bfd_size_type offset
)
3356 xtensa_isa isa
= xtensa_default_isa
;
3358 static xtensa_insnbuf ibuff
= NULL
;
3360 if (offset
+ MIN_INSN_LENGTH
> content_len
)
3364 ibuff
= xtensa_insnbuf_alloc (isa
);
3365 xtensa_insnbuf_from_chars (isa
, ibuff
, &contents
[offset
],
3366 content_len
- offset
);
3367 fmt
= xtensa_format_decode (isa
, ibuff
);
3368 if (fmt
== XTENSA_UNDEFINED
)
3370 insn_len
= xtensa_format_length (isa
, fmt
);
3371 if (insn_len
== XTENSA_UNDEFINED
)
3377 /* Decode the opcode for a single slot instruction.
3378 Return 0 if it fails to decode or the instruction is multi-slot. */
3381 insn_decode_opcode (bfd_byte
*contents
,
3382 bfd_size_type content_len
,
3383 bfd_size_type offset
,
3386 xtensa_isa isa
= xtensa_default_isa
;
3388 static xtensa_insnbuf insnbuf
= NULL
;
3389 static xtensa_insnbuf slotbuf
= NULL
;
3391 if (offset
+ MIN_INSN_LENGTH
> content_len
)
3392 return XTENSA_UNDEFINED
;
3394 if (insnbuf
== NULL
)
3396 insnbuf
= xtensa_insnbuf_alloc (isa
);
3397 slotbuf
= xtensa_insnbuf_alloc (isa
);
3400 xtensa_insnbuf_from_chars (isa
, insnbuf
, &contents
[offset
],
3401 content_len
- offset
);
3402 fmt
= xtensa_format_decode (isa
, insnbuf
);
3403 if (fmt
== XTENSA_UNDEFINED
)
3404 return XTENSA_UNDEFINED
;
3406 if (slot
>= xtensa_format_num_slots (isa
, fmt
))
3407 return XTENSA_UNDEFINED
;
3409 xtensa_format_get_slot (isa
, fmt
, slot
, insnbuf
, slotbuf
);
3410 return xtensa_opcode_decode (isa
, fmt
, slot
, slotbuf
);
3414 /* The offset is the offset in the contents.
3415 The address is the address of that offset. */
3418 check_branch_target_aligned (bfd_byte
*contents
,
3419 bfd_size_type content_length
,
3423 bfd_size_type insn_len
= insn_decode_len (contents
, content_length
, offset
);
3426 return check_branch_target_aligned_address (address
, insn_len
);
3431 check_loop_aligned (bfd_byte
*contents
,
3432 bfd_size_type content_length
,
3436 bfd_size_type loop_len
, insn_len
;
3437 xtensa_opcode opcode
;
3439 opcode
= insn_decode_opcode (contents
, content_length
, offset
, 0);
3440 if (opcode
== XTENSA_UNDEFINED
3441 || xtensa_opcode_is_loop (xtensa_default_isa
, opcode
) != 1)
3447 loop_len
= insn_decode_len (contents
, content_length
, offset
);
3448 insn_len
= insn_decode_len (contents
, content_length
, offset
+ loop_len
);
3449 if (loop_len
== 0 || insn_len
== 0)
3455 return check_branch_target_aligned_address (address
+ loop_len
, insn_len
);
3460 check_branch_target_aligned_address (bfd_vma addr
, int len
)
3463 return (addr
% 8 == 0);
3464 return ((addr
>> 2) == ((addr
+ len
- 1) >> 2));
3468 /* Instruction widening and narrowing. */
3470 /* When FLIX is available we need to access certain instructions only
3471 when they are 16-bit or 24-bit instructions. This table caches
3472 information about such instructions by walking through all the
3473 opcodes and finding the smallest single-slot format into which each
3476 static xtensa_format
*op_single_fmt_table
= NULL
;
3480 init_op_single_format_table (void)
3482 xtensa_isa isa
= xtensa_default_isa
;
3483 xtensa_insnbuf ibuf
;
3484 xtensa_opcode opcode
;
3488 if (op_single_fmt_table
)
3491 ibuf
= xtensa_insnbuf_alloc (isa
);
3492 num_opcodes
= xtensa_isa_num_opcodes (isa
);
3494 op_single_fmt_table
= (xtensa_format
*)
3495 bfd_malloc (sizeof (xtensa_format
) * num_opcodes
);
3496 for (opcode
= 0; opcode
< num_opcodes
; opcode
++)
3498 op_single_fmt_table
[opcode
] = XTENSA_UNDEFINED
;
3499 for (fmt
= 0; fmt
< xtensa_isa_num_formats (isa
); fmt
++)
3501 if (xtensa_format_num_slots (isa
, fmt
) == 1
3502 && xtensa_opcode_encode (isa
, fmt
, 0, ibuf
, opcode
) == 0)
3504 xtensa_opcode old_fmt
= op_single_fmt_table
[opcode
];
3505 int fmt_length
= xtensa_format_length (isa
, fmt
);
3506 if (old_fmt
== XTENSA_UNDEFINED
3507 || fmt_length
< xtensa_format_length (isa
, old_fmt
))
3508 op_single_fmt_table
[opcode
] = fmt
;
3512 xtensa_insnbuf_free (isa
, ibuf
);
3516 static xtensa_format
3517 get_single_format (xtensa_opcode opcode
)
3519 init_op_single_format_table ();
3520 return op_single_fmt_table
[opcode
];
3524 /* For the set of narrowable instructions we do NOT include the
3525 narrowings beqz -> beqz.n or bnez -> bnez.n because of complexities
3526 involved during linker relaxation that may require these to
3527 re-expand in some conditions. Also, the narrowing "or" -> mov.n
3528 requires special case code to ensure it only works when op1 == op2. */
3536 struct string_pair narrowable
[] =
3539 { "addi", "addi.n" },
3540 { "addmi", "addi.n" },
3541 { "l32i", "l32i.n" },
3542 { "movi", "movi.n" },
3544 { "retw", "retw.n" },
3545 { "s32i", "s32i.n" },
3546 { "or", "mov.n" } /* special case only when op1 == op2 */
3549 struct string_pair widenable
[] =
3552 { "addi", "addi.n" },
3553 { "addmi", "addi.n" },
3554 { "beqz", "beqz.n" },
3555 { "bnez", "bnez.n" },
3556 { "l32i", "l32i.n" },
3557 { "movi", "movi.n" },
3559 { "retw", "retw.n" },
3560 { "s32i", "s32i.n" },
3561 { "or", "mov.n" } /* special case only when op1 == op2 */
3565 /* Check if an instruction can be "narrowed", i.e., changed from a standard
3566 3-byte instruction to a 2-byte "density" instruction. If it is valid,
3567 return the instruction buffer holding the narrow instruction. Otherwise,
3568 return 0. The set of valid narrowing are specified by a string table
3569 but require some special case operand checks in some cases. */
3571 static xtensa_insnbuf
3572 can_narrow_instruction (xtensa_insnbuf slotbuf
,
3574 xtensa_opcode opcode
)
3576 xtensa_isa isa
= xtensa_default_isa
;
3577 xtensa_format o_fmt
;
3580 static xtensa_insnbuf o_insnbuf
= NULL
;
3581 static xtensa_insnbuf o_slotbuf
= NULL
;
3583 if (o_insnbuf
== NULL
)
3585 o_insnbuf
= xtensa_insnbuf_alloc (isa
);
3586 o_slotbuf
= xtensa_insnbuf_alloc (isa
);
3589 for (opi
= 0; opi
< (sizeof (narrowable
)/sizeof (struct string_pair
)); opi
++)
3591 bfd_boolean is_or
= (strcmp ("or", narrowable
[opi
].wide
) == 0);
3593 if (opcode
== xtensa_opcode_lookup (isa
, narrowable
[opi
].wide
))
3595 uint32 value
, newval
;
3596 int i
, operand_count
, o_operand_count
;
3597 xtensa_opcode o_opcode
;
3599 /* Address does not matter in this case. We might need to
3600 fix it to handle branches/jumps. */
3601 bfd_vma self_address
= 0;
3603 o_opcode
= xtensa_opcode_lookup (isa
, narrowable
[opi
].narrow
);
3604 if (o_opcode
== XTENSA_UNDEFINED
)
3606 o_fmt
= get_single_format (o_opcode
);
3607 if (o_fmt
== XTENSA_UNDEFINED
)
3610 if (xtensa_format_length (isa
, fmt
) != 3
3611 || xtensa_format_length (isa
, o_fmt
) != 2)
3614 xtensa_format_encode (isa
, o_fmt
, o_insnbuf
);
3615 operand_count
= xtensa_opcode_num_operands (isa
, opcode
);
3616 o_operand_count
= xtensa_opcode_num_operands (isa
, o_opcode
);
3618 if (xtensa_opcode_encode (isa
, o_fmt
, 0, o_slotbuf
, o_opcode
) != 0)
3623 if (xtensa_opcode_num_operands (isa
, o_opcode
) != operand_count
)
3628 uint32 rawval0
, rawval1
, rawval2
;
3630 if (o_operand_count
+ 1 != operand_count
3631 || xtensa_operand_get_field (isa
, opcode
, 0,
3632 fmt
, 0, slotbuf
, &rawval0
) != 0
3633 || xtensa_operand_get_field (isa
, opcode
, 1,
3634 fmt
, 0, slotbuf
, &rawval1
) != 0
3635 || xtensa_operand_get_field (isa
, opcode
, 2,
3636 fmt
, 0, slotbuf
, &rawval2
) != 0
3637 || rawval1
!= rawval2
3638 || rawval0
== rawval1
/* it is a nop */)
3642 for (i
= 0; i
< o_operand_count
; ++i
)
3644 if (xtensa_operand_get_field (isa
, opcode
, i
, fmt
, 0,
3646 || xtensa_operand_decode (isa
, opcode
, i
, &value
))
3649 /* PC-relative branches need adjustment, but
3650 the PC-rel operand will always have a relocation. */
3652 if (xtensa_operand_do_reloc (isa
, o_opcode
, i
, &newval
,
3654 || xtensa_operand_encode (isa
, o_opcode
, i
, &newval
)
3655 || xtensa_operand_set_field (isa
, o_opcode
, i
, o_fmt
, 0,
3660 if (xtensa_format_set_slot (isa
, o_fmt
, 0, o_insnbuf
, o_slotbuf
))
3670 /* Attempt to narrow an instruction. If the narrowing is valid, perform
3671 the action in-place directly into the contents and return TRUE. Otherwise,
3672 the return value is FALSE and the contents are not modified. */
3675 narrow_instruction (bfd_byte
*contents
,
3676 bfd_size_type content_length
,
3677 bfd_size_type offset
)
3679 xtensa_opcode opcode
;
3680 bfd_size_type insn_len
;
3681 xtensa_isa isa
= xtensa_default_isa
;
3683 xtensa_insnbuf o_insnbuf
;
3685 static xtensa_insnbuf insnbuf
= NULL
;
3686 static xtensa_insnbuf slotbuf
= NULL
;
3688 if (insnbuf
== NULL
)
3690 insnbuf
= xtensa_insnbuf_alloc (isa
);
3691 slotbuf
= xtensa_insnbuf_alloc (isa
);
3694 BFD_ASSERT (offset
< content_length
);
3696 if (content_length
< 2)
3699 /* We will hand-code a few of these for a little while.
3700 These have all been specified in the assembler aleady. */
3701 xtensa_insnbuf_from_chars (isa
, insnbuf
, &contents
[offset
],
3702 content_length
- offset
);
3703 fmt
= xtensa_format_decode (isa
, insnbuf
);
3704 if (xtensa_format_num_slots (isa
, fmt
) != 1)
3707 if (xtensa_format_get_slot (isa
, fmt
, 0, insnbuf
, slotbuf
) != 0)
3710 opcode
= xtensa_opcode_decode (isa
, fmt
, 0, slotbuf
);
3711 if (opcode
== XTENSA_UNDEFINED
)
3713 insn_len
= xtensa_format_length (isa
, fmt
);
3714 if (insn_len
> content_length
)
3717 o_insnbuf
= can_narrow_instruction (slotbuf
, fmt
, opcode
);
3720 xtensa_insnbuf_to_chars (isa
, o_insnbuf
, contents
+ offset
,
3721 content_length
- offset
);
3729 /* Check if an instruction can be "widened", i.e., changed from a 2-byte
3730 "density" instruction to a standard 3-byte instruction. If it is valid,
3731 return the instruction buffer holding the wide instruction. Otherwise,
3732 return 0. The set of valid widenings are specified by a string table
3733 but require some special case operand checks in some cases. */
3735 static xtensa_insnbuf
3736 can_widen_instruction (xtensa_insnbuf slotbuf
,
3738 xtensa_opcode opcode
)
3740 xtensa_isa isa
= xtensa_default_isa
;
3741 xtensa_format o_fmt
;
3744 static xtensa_insnbuf o_insnbuf
= NULL
;
3745 static xtensa_insnbuf o_slotbuf
= NULL
;
3747 if (o_insnbuf
== NULL
)
3749 o_insnbuf
= xtensa_insnbuf_alloc (isa
);
3750 o_slotbuf
= xtensa_insnbuf_alloc (isa
);
3753 for (opi
= 0; opi
< (sizeof (widenable
)/sizeof (struct string_pair
)); opi
++)
3755 bfd_boolean is_or
= (strcmp ("or", widenable
[opi
].wide
) == 0);
3756 bfd_boolean is_branch
= (strcmp ("beqz", widenable
[opi
].wide
) == 0
3757 || strcmp ("bnez", widenable
[opi
].wide
) == 0);
3759 if (opcode
== xtensa_opcode_lookup (isa
, widenable
[opi
].narrow
))
3761 uint32 value
, newval
;
3762 int i
, operand_count
, o_operand_count
, check_operand_count
;
3763 xtensa_opcode o_opcode
;
3765 /* Address does not matter in this case. We might need to fix it
3766 to handle branches/jumps. */
3767 bfd_vma self_address
= 0;
3769 o_opcode
= xtensa_opcode_lookup (isa
, widenable
[opi
].wide
);
3770 if (o_opcode
== XTENSA_UNDEFINED
)
3772 o_fmt
= get_single_format (o_opcode
);
3773 if (o_fmt
== XTENSA_UNDEFINED
)
3776 if (xtensa_format_length (isa
, fmt
) != 2
3777 || xtensa_format_length (isa
, o_fmt
) != 3)
3780 xtensa_format_encode (isa
, o_fmt
, o_insnbuf
);
3781 operand_count
= xtensa_opcode_num_operands (isa
, opcode
);
3782 o_operand_count
= xtensa_opcode_num_operands (isa
, o_opcode
);
3783 check_operand_count
= o_operand_count
;
3785 if (xtensa_opcode_encode (isa
, o_fmt
, 0, o_slotbuf
, o_opcode
) != 0)
3790 if (xtensa_opcode_num_operands (isa
, o_opcode
) != operand_count
)
3795 uint32 rawval0
, rawval1
;
3797 if (o_operand_count
!= operand_count
+ 1
3798 || xtensa_operand_get_field (isa
, opcode
, 0,
3799 fmt
, 0, slotbuf
, &rawval0
) != 0
3800 || xtensa_operand_get_field (isa
, opcode
, 1,
3801 fmt
, 0, slotbuf
, &rawval1
) != 0
3802 || rawval0
== rawval1
/* it is a nop */)
3806 check_operand_count
--;
3808 for (i
= 0; i
< check_operand_count
; i
++)
3811 if (is_or
&& i
== o_operand_count
- 1)
3813 if (xtensa_operand_get_field (isa
, opcode
, new_i
, fmt
, 0,
3815 || xtensa_operand_decode (isa
, opcode
, new_i
, &value
))
3818 /* PC-relative branches need adjustment, but
3819 the PC-rel operand will always have a relocation. */
3821 if (xtensa_operand_do_reloc (isa
, o_opcode
, i
, &newval
,
3823 || xtensa_operand_encode (isa
, o_opcode
, i
, &newval
)
3824 || xtensa_operand_set_field (isa
, o_opcode
, i
, o_fmt
, 0,
3829 if (xtensa_format_set_slot (isa
, o_fmt
, 0, o_insnbuf
, o_slotbuf
))
3839 /* Attempt to widen an instruction. If the widening is valid, perform
3840 the action in-place directly into the contents and return TRUE. Otherwise,
3841 the return value is FALSE and the contents are not modified. */
3844 widen_instruction (bfd_byte
*contents
,
3845 bfd_size_type content_length
,
3846 bfd_size_type offset
)
3848 xtensa_opcode opcode
;
3849 bfd_size_type insn_len
;
3850 xtensa_isa isa
= xtensa_default_isa
;
3852 xtensa_insnbuf o_insnbuf
;
3854 static xtensa_insnbuf insnbuf
= NULL
;
3855 static xtensa_insnbuf slotbuf
= NULL
;
3857 if (insnbuf
== NULL
)
3859 insnbuf
= xtensa_insnbuf_alloc (isa
);
3860 slotbuf
= xtensa_insnbuf_alloc (isa
);
3863 BFD_ASSERT (offset
< content_length
);
3865 if (content_length
< 2)
3868 /* We will hand-code a few of these for a little while.
3869 These have all been specified in the assembler aleady. */
3870 xtensa_insnbuf_from_chars (isa
, insnbuf
, &contents
[offset
],
3871 content_length
- offset
);
3872 fmt
= xtensa_format_decode (isa
, insnbuf
);
3873 if (xtensa_format_num_slots (isa
, fmt
) != 1)
3876 if (xtensa_format_get_slot (isa
, fmt
, 0, insnbuf
, slotbuf
) != 0)
3879 opcode
= xtensa_opcode_decode (isa
, fmt
, 0, slotbuf
);
3880 if (opcode
== XTENSA_UNDEFINED
)
3882 insn_len
= xtensa_format_length (isa
, fmt
);
3883 if (insn_len
> content_length
)
3886 o_insnbuf
= can_widen_instruction (slotbuf
, fmt
, opcode
);
3889 xtensa_insnbuf_to_chars (isa
, o_insnbuf
, contents
+ offset
,
3890 content_length
- offset
);
3897 /* Code for transforming CALLs at link-time. */
3899 static bfd_reloc_status_type
3900 elf_xtensa_do_asm_simplify (bfd_byte
*contents
,
3902 bfd_vma content_length
,
3903 char **error_message
)
3905 static xtensa_insnbuf insnbuf
= NULL
;
3906 static xtensa_insnbuf slotbuf
= NULL
;
3907 xtensa_format core_format
= XTENSA_UNDEFINED
;
3908 xtensa_opcode opcode
;
3909 xtensa_opcode direct_call_opcode
;
3910 xtensa_isa isa
= xtensa_default_isa
;
3911 bfd_byte
*chbuf
= contents
+ address
;
3914 if (insnbuf
== NULL
)
3916 insnbuf
= xtensa_insnbuf_alloc (isa
);
3917 slotbuf
= xtensa_insnbuf_alloc (isa
);
3920 if (content_length
< address
)
3922 *error_message
= _("Attempt to convert L32R/CALLX to CALL failed");
3923 return bfd_reloc_other
;
3926 opcode
= get_expanded_call_opcode (chbuf
, content_length
- address
, 0);
3927 direct_call_opcode
= swap_callx_for_call_opcode (opcode
);
3928 if (direct_call_opcode
== XTENSA_UNDEFINED
)
3930 *error_message
= _("Attempt to convert L32R/CALLX to CALL failed");
3931 return bfd_reloc_other
;
3934 /* Assemble a NOP ("or a1, a1, a1") into the 0 byte offset. */
3935 core_format
= xtensa_format_lookup (isa
, "x24");
3936 opcode
= xtensa_opcode_lookup (isa
, "or");
3937 xtensa_opcode_encode (isa
, core_format
, 0, slotbuf
, opcode
);
3938 for (opn
= 0; opn
< 3; opn
++)
3941 xtensa_operand_encode (isa
, opcode
, opn
, ®no
);
3942 xtensa_operand_set_field (isa
, opcode
, opn
, core_format
, 0,
3945 xtensa_format_encode (isa
, core_format
, insnbuf
);
3946 xtensa_format_set_slot (isa
, core_format
, 0, insnbuf
, slotbuf
);
3947 xtensa_insnbuf_to_chars (isa
, insnbuf
, chbuf
, content_length
- address
);
3949 /* Assemble a CALL ("callN 0") into the 3 byte offset. */
3950 xtensa_opcode_encode (isa
, core_format
, 0, slotbuf
, direct_call_opcode
);
3951 xtensa_operand_set_field (isa
, opcode
, 0, core_format
, 0, slotbuf
, 0);
3953 xtensa_format_encode (isa
, core_format
, insnbuf
);
3954 xtensa_format_set_slot (isa
, core_format
, 0, insnbuf
, slotbuf
);
3955 xtensa_insnbuf_to_chars (isa
, insnbuf
, chbuf
+ 3,
3956 content_length
- address
- 3);
3958 return bfd_reloc_ok
;
3962 static bfd_reloc_status_type
3963 contract_asm_expansion (bfd_byte
*contents
,
3964 bfd_vma content_length
,
3965 Elf_Internal_Rela
*irel
,
3966 char **error_message
)
3968 bfd_reloc_status_type retval
=
3969 elf_xtensa_do_asm_simplify (contents
, irel
->r_offset
, content_length
,
3972 if (retval
!= bfd_reloc_ok
)
3973 return bfd_reloc_dangerous
;
3975 /* Update the irel->r_offset field so that the right immediate and
3976 the right instruction are modified during the relocation. */
3977 irel
->r_offset
+= 3;
3978 irel
->r_info
= ELF32_R_INFO (ELF32_R_SYM (irel
->r_info
), R_XTENSA_SLOT0_OP
);
3979 return bfd_reloc_ok
;
3983 static xtensa_opcode
3984 swap_callx_for_call_opcode (xtensa_opcode opcode
)
3986 init_call_opcodes ();
3988 if (opcode
== callx0_op
) return call0_op
;
3989 if (opcode
== callx4_op
) return call4_op
;
3990 if (opcode
== callx8_op
) return call8_op
;
3991 if (opcode
== callx12_op
) return call12_op
;
3993 /* Return XTENSA_UNDEFINED if the opcode is not an indirect call. */
3994 return XTENSA_UNDEFINED
;
3998 /* Check if "buf" is pointing to a "L32R aN; CALLX aN" or "CONST16 aN;
3999 CONST16 aN; CALLX aN" sequence, and if so, return the CALLX opcode.
4000 If not, return XTENSA_UNDEFINED. */
4002 #define L32R_TARGET_REG_OPERAND 0
4003 #define CONST16_TARGET_REG_OPERAND 0
4004 #define CALLN_SOURCE_OPERAND 0
4006 static xtensa_opcode
4007 get_expanded_call_opcode (bfd_byte
*buf
, int bufsize
, bfd_boolean
*p_uses_l32r
)
4009 static xtensa_insnbuf insnbuf
= NULL
;
4010 static xtensa_insnbuf slotbuf
= NULL
;
4012 xtensa_opcode opcode
;
4013 xtensa_isa isa
= xtensa_default_isa
;
4014 uint32 regno
, const16_regno
, call_regno
;
4017 if (insnbuf
== NULL
)
4019 insnbuf
= xtensa_insnbuf_alloc (isa
);
4020 slotbuf
= xtensa_insnbuf_alloc (isa
);
4023 xtensa_insnbuf_from_chars (isa
, insnbuf
, buf
, bufsize
);
4024 fmt
= xtensa_format_decode (isa
, insnbuf
);
4025 if (fmt
== XTENSA_UNDEFINED
4026 || xtensa_format_get_slot (isa
, fmt
, 0, insnbuf
, slotbuf
))
4027 return XTENSA_UNDEFINED
;
4029 opcode
= xtensa_opcode_decode (isa
, fmt
, 0, slotbuf
);
4030 if (opcode
== XTENSA_UNDEFINED
)
4031 return XTENSA_UNDEFINED
;
4033 if (opcode
== get_l32r_opcode ())
4036 *p_uses_l32r
= TRUE
;
4037 if (xtensa_operand_get_field (isa
, opcode
, L32R_TARGET_REG_OPERAND
,
4038 fmt
, 0, slotbuf
, ®no
)
4039 || xtensa_operand_decode (isa
, opcode
, L32R_TARGET_REG_OPERAND
,
4041 return XTENSA_UNDEFINED
;
4043 else if (opcode
== get_const16_opcode ())
4046 *p_uses_l32r
= FALSE
;
4047 if (xtensa_operand_get_field (isa
, opcode
, CONST16_TARGET_REG_OPERAND
,
4048 fmt
, 0, slotbuf
, ®no
)
4049 || xtensa_operand_decode (isa
, opcode
, CONST16_TARGET_REG_OPERAND
,
4051 return XTENSA_UNDEFINED
;
4053 /* Check that the next instruction is also CONST16. */
4054 offset
+= xtensa_format_length (isa
, fmt
);
4055 xtensa_insnbuf_from_chars (isa
, insnbuf
, buf
+ offset
, bufsize
- offset
);
4056 fmt
= xtensa_format_decode (isa
, insnbuf
);
4057 if (fmt
== XTENSA_UNDEFINED
4058 || xtensa_format_get_slot (isa
, fmt
, 0, insnbuf
, slotbuf
))
4059 return XTENSA_UNDEFINED
;
4060 opcode
= xtensa_opcode_decode (isa
, fmt
, 0, slotbuf
);
4061 if (opcode
!= get_const16_opcode ())
4062 return XTENSA_UNDEFINED
;
4064 if (xtensa_operand_get_field (isa
, opcode
, CONST16_TARGET_REG_OPERAND
,
4065 fmt
, 0, slotbuf
, &const16_regno
)
4066 || xtensa_operand_decode (isa
, opcode
, CONST16_TARGET_REG_OPERAND
,
4068 || const16_regno
!= regno
)
4069 return XTENSA_UNDEFINED
;
4072 return XTENSA_UNDEFINED
;
4074 /* Next instruction should be an CALLXn with operand 0 == regno. */
4075 offset
+= xtensa_format_length (isa
, fmt
);
4076 xtensa_insnbuf_from_chars (isa
, insnbuf
, buf
+ offset
, bufsize
- offset
);
4077 fmt
= xtensa_format_decode (isa
, insnbuf
);
4078 if (fmt
== XTENSA_UNDEFINED
4079 || xtensa_format_get_slot (isa
, fmt
, 0, insnbuf
, slotbuf
))
4080 return XTENSA_UNDEFINED
;
4081 opcode
= xtensa_opcode_decode (isa
, fmt
, 0, slotbuf
);
4082 if (opcode
== XTENSA_UNDEFINED
4083 || !is_indirect_call_opcode (opcode
))
4084 return XTENSA_UNDEFINED
;
4086 if (xtensa_operand_get_field (isa
, opcode
, CALLN_SOURCE_OPERAND
,
4087 fmt
, 0, slotbuf
, &call_regno
)
4088 || xtensa_operand_decode (isa
, opcode
, CALLN_SOURCE_OPERAND
,
4090 return XTENSA_UNDEFINED
;
4092 if (call_regno
!= regno
)
4093 return XTENSA_UNDEFINED
;
4099 /* Data structures used during relaxation. */
4101 /* r_reloc: relocation values. */
4103 /* Through the relaxation process, we need to keep track of the values
4104 that will result from evaluating relocations. The standard ELF
4105 relocation structure is not sufficient for this purpose because we're
4106 operating on multiple input files at once, so we need to know which
4107 input file a relocation refers to. The r_reloc structure thus
4108 records both the input file (bfd) and ELF relocation.
4110 For efficiency, an r_reloc also contains a "target_offset" field to
4111 cache the target-section-relative offset value that is represented by
4114 The r_reloc also contains a virtual offset that allows multiple
4115 inserted literals to be placed at the same "address" with
4116 different offsets. */
4118 typedef struct r_reloc_struct r_reloc
;
4120 struct r_reloc_struct
4123 Elf_Internal_Rela rela
;
4124 bfd_vma target_offset
;
4125 bfd_vma virtual_offset
;
4129 /* The r_reloc structure is included by value in literal_value, but not
4130 every literal_value has an associated relocation -- some are simple
4131 constants. In such cases, we set all the fields in the r_reloc
4132 struct to zero. The r_reloc_is_const function should be used to
4133 detect this case. */
4136 r_reloc_is_const (const r_reloc
*r_rel
)
4138 return (r_rel
->abfd
== NULL
);
4143 r_reloc_get_target_offset (const r_reloc
*r_rel
)
4145 bfd_vma target_offset
;
4146 unsigned long r_symndx
;
4148 BFD_ASSERT (!r_reloc_is_const (r_rel
));
4149 r_symndx
= ELF32_R_SYM (r_rel
->rela
.r_info
);
4150 target_offset
= get_elf_r_symndx_offset (r_rel
->abfd
, r_symndx
);
4151 return (target_offset
+ r_rel
->rela
.r_addend
);
4155 static struct elf_link_hash_entry
*
4156 r_reloc_get_hash_entry (const r_reloc
*r_rel
)
4158 unsigned long r_symndx
= ELF32_R_SYM (r_rel
->rela
.r_info
);
4159 return get_elf_r_symndx_hash_entry (r_rel
->abfd
, r_symndx
);
4164 r_reloc_get_section (const r_reloc
*r_rel
)
4166 unsigned long r_symndx
= ELF32_R_SYM (r_rel
->rela
.r_info
);
4167 return get_elf_r_symndx_section (r_rel
->abfd
, r_symndx
);
4172 r_reloc_is_defined (const r_reloc
*r_rel
)
4178 sec
= r_reloc_get_section (r_rel
);
4179 if (sec
== bfd_abs_section_ptr
4180 || sec
== bfd_com_section_ptr
4181 || sec
== bfd_und_section_ptr
)
4188 r_reloc_init (r_reloc
*r_rel
,
4190 Elf_Internal_Rela
*irel
,
4192 bfd_size_type content_length
)
4195 reloc_howto_type
*howto
;
4199 r_rel
->rela
= *irel
;
4201 r_rel
->target_offset
= r_reloc_get_target_offset (r_rel
);
4202 r_rel
->virtual_offset
= 0;
4203 r_type
= ELF32_R_TYPE (r_rel
->rela
.r_info
);
4204 howto
= &elf_howto_table
[r_type
];
4205 if (howto
->partial_inplace
)
4207 bfd_vma inplace_val
;
4208 BFD_ASSERT (r_rel
->rela
.r_offset
< content_length
);
4210 inplace_val
= bfd_get_32 (abfd
, &contents
[r_rel
->rela
.r_offset
]);
4211 r_rel
->target_offset
+= inplace_val
;
4215 memset (r_rel
, 0, sizeof (r_reloc
));
4222 print_r_reloc (FILE *fp
, const r_reloc
*r_rel
)
4224 if (r_reloc_is_defined (r_rel
))
4226 asection
*sec
= r_reloc_get_section (r_rel
);
4227 fprintf (fp
, " %s(%s + ", sec
->owner
->filename
, sec
->name
);
4229 else if (r_reloc_get_hash_entry (r_rel
))
4230 fprintf (fp
, " %s + ", r_reloc_get_hash_entry (r_rel
)->root
.root
.string
);
4232 fprintf (fp
, " ?? + ");
4234 fprintf_vma (fp
, r_rel
->target_offset
);
4235 if (r_rel
->virtual_offset
)
4237 fprintf (fp
, " + ");
4238 fprintf_vma (fp
, r_rel
->virtual_offset
);
4247 /* source_reloc: relocations that reference literals. */
4249 /* To determine whether literals can be coalesced, we need to first
4250 record all the relocations that reference the literals. The
4251 source_reloc structure below is used for this purpose. The
4252 source_reloc entries are kept in a per-literal-section array, sorted
4253 by offset within the literal section (i.e., target offset).
4255 The source_sec and r_rel.rela.r_offset fields identify the source of
4256 the relocation. The r_rel field records the relocation value, i.e.,
4257 the offset of the literal being referenced. The opnd field is needed
4258 to determine the range of the immediate field to which the relocation
4259 applies, so we can determine whether another literal with the same
4260 value is within range. The is_null field is true when the relocation
4261 is being removed (e.g., when an L32R is being removed due to a CALLX
4262 that is converted to a direct CALL). */
4264 typedef struct source_reloc_struct source_reloc
;
4266 struct source_reloc_struct
4268 asection
*source_sec
;
4270 xtensa_opcode opcode
;
4272 bfd_boolean is_null
;
4273 bfd_boolean is_abs_literal
;
4278 init_source_reloc (source_reloc
*reloc
,
4279 asection
*source_sec
,
4280 const r_reloc
*r_rel
,
4281 xtensa_opcode opcode
,
4283 bfd_boolean is_abs_literal
)
4285 reloc
->source_sec
= source_sec
;
4286 reloc
->r_rel
= *r_rel
;
4287 reloc
->opcode
= opcode
;
4289 reloc
->is_null
= FALSE
;
4290 reloc
->is_abs_literal
= is_abs_literal
;
4294 /* Find the source_reloc for a particular source offset and relocation
4295 type. Note that the array is sorted by _target_ offset, so this is
4296 just a linear search. */
4298 static source_reloc
*
4299 find_source_reloc (source_reloc
*src_relocs
,
4302 Elf_Internal_Rela
*irel
)
4306 for (i
= 0; i
< src_count
; i
++)
4308 if (src_relocs
[i
].source_sec
== sec
4309 && src_relocs
[i
].r_rel
.rela
.r_offset
== irel
->r_offset
4310 && (ELF32_R_TYPE (src_relocs
[i
].r_rel
.rela
.r_info
)
4311 == ELF32_R_TYPE (irel
->r_info
)))
4312 return &src_relocs
[i
];
4320 source_reloc_compare (const void *ap
, const void *bp
)
4322 const source_reloc
*a
= (const source_reloc
*) ap
;
4323 const source_reloc
*b
= (const source_reloc
*) bp
;
4325 if (a
->r_rel
.target_offset
!= b
->r_rel
.target_offset
)
4326 return (a
->r_rel
.target_offset
- b
->r_rel
.target_offset
);
4328 /* We don't need to sort on these criteria for correctness,
4329 but enforcing a more strict ordering prevents unstable qsort
4330 from behaving differently with different implementations.
4331 Without the code below we get correct but different results
4332 on Solaris 2.7 and 2.8. We would like to always produce the
4333 same results no matter the host. */
4335 if ((!a
->is_null
) - (!b
->is_null
))
4336 return ((!a
->is_null
) - (!b
->is_null
));
4337 return internal_reloc_compare (&a
->r_rel
.rela
, &b
->r_rel
.rela
);
4341 /* Literal values and value hash tables. */
4343 /* Literals with the same value can be coalesced. The literal_value
4344 structure records the value of a literal: the "r_rel" field holds the
4345 information from the relocation on the literal (if there is one) and
4346 the "value" field holds the contents of the literal word itself.
4348 The value_map structure records a literal value along with the
4349 location of a literal holding that value. The value_map hash table
4350 is indexed by the literal value, so that we can quickly check if a
4351 particular literal value has been seen before and is thus a candidate
4354 typedef struct literal_value_struct literal_value
;
4355 typedef struct value_map_struct value_map
;
4356 typedef struct value_map_hash_table_struct value_map_hash_table
;
4358 struct literal_value_struct
4361 unsigned long value
;
4362 bfd_boolean is_abs_literal
;
4365 struct value_map_struct
4367 literal_value val
; /* The literal value. */
4368 r_reloc loc
; /* Location of the literal. */
4372 struct value_map_hash_table_struct
4374 unsigned bucket_count
;
4375 value_map
**buckets
;
4377 bfd_boolean has_last_loc
;
4383 init_literal_value (literal_value
*lit
,
4384 const r_reloc
*r_rel
,
4385 unsigned long value
,
4386 bfd_boolean is_abs_literal
)
4388 lit
->r_rel
= *r_rel
;
4390 lit
->is_abs_literal
= is_abs_literal
;
4395 literal_value_equal (const literal_value
*src1
,
4396 const literal_value
*src2
,
4397 bfd_boolean final_static_link
)
4399 struct elf_link_hash_entry
*h1
, *h2
;
4401 if (r_reloc_is_const (&src1
->r_rel
) != r_reloc_is_const (&src2
->r_rel
))
4404 if (r_reloc_is_const (&src1
->r_rel
))
4405 return (src1
->value
== src2
->value
);
4407 if (ELF32_R_TYPE (src1
->r_rel
.rela
.r_info
)
4408 != ELF32_R_TYPE (src2
->r_rel
.rela
.r_info
))
4411 if (src1
->r_rel
.target_offset
!= src2
->r_rel
.target_offset
)
4414 if (src1
->r_rel
.virtual_offset
!= src2
->r_rel
.virtual_offset
)
4417 if (src1
->value
!= src2
->value
)
4420 /* Now check for the same section (if defined) or the same elf_hash
4421 (if undefined or weak). */
4422 h1
= r_reloc_get_hash_entry (&src1
->r_rel
);
4423 h2
= r_reloc_get_hash_entry (&src2
->r_rel
);
4424 if (r_reloc_is_defined (&src1
->r_rel
)
4425 && (final_static_link
4426 || ((!h1
|| h1
->root
.type
!= bfd_link_hash_defweak
)
4427 && (!h2
|| h2
->root
.type
!= bfd_link_hash_defweak
))))
4429 if (r_reloc_get_section (&src1
->r_rel
)
4430 != r_reloc_get_section (&src2
->r_rel
))
4435 /* Require that the hash entries (i.e., symbols) be identical. */
4436 if (h1
!= h2
|| h1
== 0)
4440 if (src1
->is_abs_literal
!= src2
->is_abs_literal
)
4447 /* Must be power of 2. */
4448 #define INITIAL_HASH_RELOC_BUCKET_COUNT 1024
4450 static value_map_hash_table
*
4451 value_map_hash_table_init (void)
4453 value_map_hash_table
*values
;
4455 values
= (value_map_hash_table
*)
4456 bfd_zmalloc (sizeof (value_map_hash_table
));
4457 values
->bucket_count
= INITIAL_HASH_RELOC_BUCKET_COUNT
;
4459 values
->buckets
= (value_map
**)
4460 bfd_zmalloc (sizeof (value_map
*) * values
->bucket_count
);
4461 if (values
->buckets
== NULL
)
4466 values
->has_last_loc
= FALSE
;
4473 value_map_hash_table_delete (value_map_hash_table
*table
)
4475 free (table
->buckets
);
4481 hash_bfd_vma (bfd_vma val
)
4483 return (val
>> 2) + (val
>> 10);
4488 literal_value_hash (const literal_value
*src
)
4492 hash_val
= hash_bfd_vma (src
->value
);
4493 if (!r_reloc_is_const (&src
->r_rel
))
4497 hash_val
+= hash_bfd_vma (src
->is_abs_literal
* 1000);
4498 hash_val
+= hash_bfd_vma (src
->r_rel
.target_offset
);
4499 hash_val
+= hash_bfd_vma (src
->r_rel
.virtual_offset
);
4501 /* Now check for the same section and the same elf_hash. */
4502 if (r_reloc_is_defined (&src
->r_rel
))
4503 sec_or_hash
= r_reloc_get_section (&src
->r_rel
);
4505 sec_or_hash
= r_reloc_get_hash_entry (&src
->r_rel
);
4506 hash_val
+= hash_bfd_vma ((bfd_vma
) (size_t) sec_or_hash
);
4512 /* Check if the specified literal_value has been seen before. */
4515 value_map_get_cached_value (value_map_hash_table
*map
,
4516 const literal_value
*val
,
4517 bfd_boolean final_static_link
)
4523 idx
= literal_value_hash (val
);
4524 idx
= idx
& (map
->bucket_count
- 1);
4525 bucket
= map
->buckets
[idx
];
4526 for (map_e
= bucket
; map_e
; map_e
= map_e
->next
)
4528 if (literal_value_equal (&map_e
->val
, val
, final_static_link
))
4535 /* Record a new literal value. It is illegal to call this if VALUE
4536 already has an entry here. */
4539 add_value_map (value_map_hash_table
*map
,
4540 const literal_value
*val
,
4542 bfd_boolean final_static_link
)
4544 value_map
**bucket_p
;
4547 value_map
*val_e
= (value_map
*) bfd_zmalloc (sizeof (value_map
));
4550 bfd_set_error (bfd_error_no_memory
);
4554 BFD_ASSERT (!value_map_get_cached_value (map
, val
, final_static_link
));
4558 idx
= literal_value_hash (val
);
4559 idx
= idx
& (map
->bucket_count
- 1);
4560 bucket_p
= &map
->buckets
[idx
];
4562 val_e
->next
= *bucket_p
;
4565 /* FIXME: Consider resizing the hash table if we get too many entries. */
4571 /* Lists of text actions (ta_) for narrowing, widening, longcall
4572 conversion, space fill, code & literal removal, etc. */
4574 /* The following text actions are generated:
4576 "ta_remove_insn" remove an instruction or instructions
4577 "ta_remove_longcall" convert longcall to call
4578 "ta_convert_longcall" convert longcall to nop/call
4579 "ta_narrow_insn" narrow a wide instruction
4580 "ta_widen" widen a narrow instruction
4581 "ta_fill" add fill or remove fill
4582 removed < 0 is a fill; branches to the fill address will be
4583 changed to address + fill size (e.g., address - removed)
4584 removed >= 0 branches to the fill address will stay unchanged
4585 "ta_remove_literal" remove a literal; this action is
4586 indicated when a literal is removed
4588 "ta_add_literal" insert a new literal; this action is
4589 indicated when a literal has been moved.
4590 It may use a virtual_offset because
4591 multiple literals can be placed at the
4594 For each of these text actions, we also record the number of bytes
4595 removed by performing the text action. In the case of a "ta_widen"
4596 or a "ta_fill" that adds space, the removed_bytes will be negative. */
4598 typedef struct text_action_struct text_action
;
4599 typedef struct text_action_list_struct text_action_list
;
4600 typedef enum text_action_enum_t text_action_t
;
4602 enum text_action_enum_t
4605 ta_remove_insn
, /* removed = -size */
4606 ta_remove_longcall
, /* removed = -size */
4607 ta_convert_longcall
, /* removed = 0 */
4608 ta_narrow_insn
, /* removed = -1 */
4609 ta_widen_insn
, /* removed = +1 */
4610 ta_fill
, /* removed = +size */
4616 /* Structure for a text action record. */
4617 struct text_action_struct
4619 text_action_t action
;
4620 asection
*sec
; /* Optional */
4622 bfd_vma virtual_offset
; /* Zero except for adding literals. */
4624 literal_value value
; /* Only valid when adding literals. */
4630 /* List of all of the actions taken on a text section. */
4631 struct text_action_list_struct
4637 static text_action
*
4638 find_fill_action (text_action_list
*l
, asection
*sec
, bfd_vma offset
)
4642 /* It is not necessary to fill at the end of a section. */
4643 if (sec
->size
== offset
)
4646 for (m_p
= &l
->head
; *m_p
&& (*m_p
)->offset
<= offset
; m_p
= &(*m_p
)->next
)
4648 text_action
*t
= *m_p
;
4649 /* When the action is another fill at the same address,
4650 just increase the size. */
4651 if (t
->offset
== offset
&& t
->action
== ta_fill
)
4659 compute_removed_action_diff (const text_action
*ta
,
4663 int removable_space
)
4666 int current_removed
= 0;
4669 current_removed
= ta
->removed_bytes
;
4671 BFD_ASSERT (ta
== NULL
|| ta
->offset
== offset
);
4672 BFD_ASSERT (ta
== NULL
|| ta
->action
== ta_fill
);
4674 /* It is not necessary to fill at the end of a section. Clean this up. */
4675 if (sec
->size
== offset
)
4676 new_removed
= removable_space
- 0;
4680 int added
= -removed
- current_removed
;
4681 /* Ignore multiples of the section alignment. */
4682 added
= ((1 << sec
->alignment_power
) - 1) & added
;
4683 new_removed
= (-added
);
4685 /* Modify for removable. */
4686 space
= removable_space
- new_removed
;
4687 new_removed
= (removable_space
4688 - (((1 << sec
->alignment_power
) - 1) & space
));
4690 return (new_removed
- current_removed
);
4695 adjust_fill_action (text_action
*ta
, int fill_diff
)
4697 ta
->removed_bytes
+= fill_diff
;
4701 /* Add a modification action to the text. For the case of adding or
4702 removing space, modify any current fill and assume that
4703 "unreachable_space" bytes can be freely contracted. Note that a
4704 negative removed value is a fill. */
4707 text_action_add (text_action_list
*l
,
4708 text_action_t action
,
4716 /* It is not necessary to fill at the end of a section. */
4717 if (action
== ta_fill
&& sec
->size
== offset
)
4720 /* It is not necessary to fill 0 bytes. */
4721 if (action
== ta_fill
&& removed
== 0)
4724 for (m_p
= &l
->head
; *m_p
&& (*m_p
)->offset
<= offset
; m_p
= &(*m_p
)->next
)
4726 text_action
*t
= *m_p
;
4727 /* When the action is another fill at the same address,
4728 just increase the size. */
4729 if (t
->offset
== offset
&& t
->action
== ta_fill
&& action
== ta_fill
)
4731 t
->removed_bytes
+= removed
;
4736 /* Create a new record and fill it up. */
4737 ta
= (text_action
*) bfd_zmalloc (sizeof (text_action
));
4738 ta
->action
= action
;
4740 ta
->offset
= offset
;
4741 ta
->removed_bytes
= removed
;
4748 text_action_add_literal (text_action_list
*l
,
4749 text_action_t action
,
4751 const literal_value
*value
,
4756 asection
*sec
= r_reloc_get_section (loc
);
4757 bfd_vma offset
= loc
->target_offset
;
4758 bfd_vma virtual_offset
= loc
->virtual_offset
;
4760 BFD_ASSERT (action
== ta_add_literal
);
4762 for (m_p
= &l
->head
; *m_p
!= NULL
; m_p
= &(*m_p
)->next
)
4764 if ((*m_p
)->offset
> offset
4765 && ((*m_p
)->offset
!= offset
4766 || (*m_p
)->virtual_offset
> virtual_offset
))
4770 /* Create a new record and fill it up. */
4771 ta
= (text_action
*) bfd_zmalloc (sizeof (text_action
));
4772 ta
->action
= action
;
4774 ta
->offset
= offset
;
4775 ta
->virtual_offset
= virtual_offset
;
4777 ta
->removed_bytes
= removed
;
4784 offset_with_removed_text (text_action_list
*action_list
, bfd_vma offset
)
4789 for (r
= action_list
->head
; r
&& r
->offset
<= offset
; r
= r
->next
)
4791 if (r
->offset
< offset
4792 || (r
->action
== ta_fill
&& r
->removed_bytes
< 0))
4793 removed
+= r
->removed_bytes
;
4796 return (offset
- removed
);
4801 action_list_count (text_action_list
*action_list
)
4803 text_action
*r
= action_list
->head
;
4805 for (r
= action_list
->head
; r
!= NULL
; r
= r
->next
)
4814 offset_with_removed_text_before_fill (text_action_list
*action_list
,
4820 for (r
= action_list
->head
; r
&& r
->offset
< offset
; r
= r
->next
)
4821 removed
+= r
->removed_bytes
;
4823 return (offset
- removed
);
4827 /* The find_insn_action routine will only find non-fill actions. */
4829 static text_action
*
4830 find_insn_action (text_action_list
*action_list
, bfd_vma offset
)
4833 for (t
= action_list
->head
; t
; t
= t
->next
)
4835 if (t
->offset
== offset
)
4842 case ta_remove_insn
:
4843 case ta_remove_longcall
:
4844 case ta_convert_longcall
:
4845 case ta_narrow_insn
:
4848 case ta_remove_literal
:
4849 case ta_add_literal
:
4862 print_action_list (FILE *fp
, text_action_list
*action_list
)
4866 fprintf (fp
, "Text Action\n");
4867 for (r
= action_list
->head
; r
!= NULL
; r
= r
->next
)
4869 const char *t
= "unknown";
4872 case ta_remove_insn
:
4873 t
= "remove_insn"; break;
4874 case ta_remove_longcall
:
4875 t
= "remove_longcall"; break;
4876 case ta_convert_longcall
:
4877 t
= "remove_longcall"; break;
4878 case ta_narrow_insn
:
4879 t
= "narrow_insn"; break;
4881 t
= "widen_insn"; break;
4886 case ta_remove_literal
:
4887 t
= "remove_literal"; break;
4888 case ta_add_literal
:
4889 t
= "add_literal"; break;
4892 fprintf (fp
, "%s: %s[0x%lx] \"%s\" %d\n",
4893 r
->sec
->owner
->filename
,
4894 r
->sec
->name
, r
->offset
, t
, r
->removed_bytes
);
4901 /* Lists of literals being coalesced or removed. */
4903 /* In the usual case, the literal identified by "from" is being
4904 coalesced with another literal identified by "to". If the literal is
4905 unused and is being removed altogether, "to.abfd" will be NULL.
4906 The removed_literal entries are kept on a per-section list, sorted
4907 by the "from" offset field. */
4909 typedef struct removed_literal_struct removed_literal
;
4910 typedef struct removed_literal_list_struct removed_literal_list
;
4912 struct removed_literal_struct
4916 removed_literal
*next
;
4919 struct removed_literal_list_struct
4921 removed_literal
*head
;
4922 removed_literal
*tail
;
4926 /* Record that the literal at "from" is being removed. If "to" is not
4927 NULL, the "from" literal is being coalesced with the "to" literal. */
4930 add_removed_literal (removed_literal_list
*removed_list
,
4931 const r_reloc
*from
,
4934 removed_literal
*r
, *new_r
, *next_r
;
4936 new_r
= (removed_literal
*) bfd_zmalloc (sizeof (removed_literal
));
4938 new_r
->from
= *from
;
4942 new_r
->to
.abfd
= NULL
;
4945 r
= removed_list
->head
;
4948 removed_list
->head
= new_r
;
4949 removed_list
->tail
= new_r
;
4951 /* Special check for common case of append. */
4952 else if (removed_list
->tail
->from
.target_offset
< from
->target_offset
)
4954 removed_list
->tail
->next
= new_r
;
4955 removed_list
->tail
= new_r
;
4959 while (r
->from
.target_offset
< from
->target_offset
&& r
->next
)
4965 new_r
->next
= next_r
;
4967 removed_list
->tail
= new_r
;
4972 /* Check if the list of removed literals contains an entry for the
4973 given address. Return the entry if found. */
4975 static removed_literal
*
4976 find_removed_literal (removed_literal_list
*removed_list
, bfd_vma addr
)
4978 removed_literal
*r
= removed_list
->head
;
4979 while (r
&& r
->from
.target_offset
< addr
)
4981 if (r
&& r
->from
.target_offset
== addr
)
4990 print_removed_literals (FILE *fp
, removed_literal_list
*removed_list
)
4993 r
= removed_list
->head
;
4995 fprintf (fp
, "Removed Literals\n");
4996 for (; r
!= NULL
; r
= r
->next
)
4998 print_r_reloc (fp
, &r
->from
);
4999 fprintf (fp
, " => ");
5000 if (r
->to
.abfd
== NULL
)
5001 fprintf (fp
, "REMOVED");
5003 print_r_reloc (fp
, &r
->to
);
5011 /* Per-section data for relaxation. */
5013 typedef struct reloc_bfd_fix_struct reloc_bfd_fix
;
5015 struct xtensa_relax_info_struct
5017 bfd_boolean is_relaxable_literal_section
;
5018 bfd_boolean is_relaxable_asm_section
;
5019 int visited
; /* Number of times visited. */
5021 source_reloc
*src_relocs
; /* Array[src_count]. */
5023 int src_next
; /* Next src_relocs entry to assign. */
5025 removed_literal_list removed_list
;
5026 text_action_list action_list
;
5028 reloc_bfd_fix
*fix_list
;
5029 reloc_bfd_fix
*fix_array
;
5030 unsigned fix_array_count
;
5032 /* Support for expanding the reloc array that is stored
5033 in the section structure. If the relocations have been
5034 reallocated, the newly allocated relocations will be referenced
5035 here along with the actual size allocated. The relocation
5036 count will always be found in the section structure. */
5037 Elf_Internal_Rela
*allocated_relocs
;
5038 unsigned relocs_count
;
5039 unsigned allocated_relocs_count
;
5042 struct elf_xtensa_section_data
5044 struct bfd_elf_section_data elf
;
5045 xtensa_relax_info relax_info
;
5050 elf_xtensa_new_section_hook (bfd
*abfd
, asection
*sec
)
5052 if (!sec
->used_by_bfd
)
5054 struct elf_xtensa_section_data
*sdata
;
5055 bfd_size_type amt
= sizeof (*sdata
);
5057 sdata
= bfd_zalloc (abfd
, amt
);
5060 sec
->used_by_bfd
= sdata
;
5063 return _bfd_elf_new_section_hook (abfd
, sec
);
5067 static xtensa_relax_info
*
5068 get_xtensa_relax_info (asection
*sec
)
5070 struct elf_xtensa_section_data
*section_data
;
5072 /* No info available if no section or if it is an output section. */
5073 if (!sec
|| sec
== sec
->output_section
)
5076 section_data
= (struct elf_xtensa_section_data
*) elf_section_data (sec
);
5077 return §ion_data
->relax_info
;
5082 init_xtensa_relax_info (asection
*sec
)
5084 xtensa_relax_info
*relax_info
= get_xtensa_relax_info (sec
);
5086 relax_info
->is_relaxable_literal_section
= FALSE
;
5087 relax_info
->is_relaxable_asm_section
= FALSE
;
5088 relax_info
->visited
= 0;
5090 relax_info
->src_relocs
= NULL
;
5091 relax_info
->src_count
= 0;
5092 relax_info
->src_next
= 0;
5094 relax_info
->removed_list
.head
= NULL
;
5095 relax_info
->removed_list
.tail
= NULL
;
5097 relax_info
->action_list
.head
= NULL
;
5099 relax_info
->fix_list
= NULL
;
5100 relax_info
->fix_array
= NULL
;
5101 relax_info
->fix_array_count
= 0;
5103 relax_info
->allocated_relocs
= NULL
;
5104 relax_info
->relocs_count
= 0;
5105 relax_info
->allocated_relocs_count
= 0;
5109 /* Coalescing literals may require a relocation to refer to a section in
5110 a different input file, but the standard relocation information
5111 cannot express that. Instead, the reloc_bfd_fix structures are used
5112 to "fix" the relocations that refer to sections in other input files.
5113 These structures are kept on per-section lists. The "src_type" field
5114 records the relocation type in case there are multiple relocations on
5115 the same location. FIXME: This is ugly; an alternative might be to
5116 add new symbols with the "owner" field to some other input file. */
5118 struct reloc_bfd_fix_struct
5122 unsigned src_type
; /* Relocation type. */
5124 asection
*target_sec
;
5125 bfd_vma target_offset
;
5126 bfd_boolean translated
;
5128 reloc_bfd_fix
*next
;
5132 static reloc_bfd_fix
*
5133 reloc_bfd_fix_init (asection
*src_sec
,
5136 asection
*target_sec
,
5137 bfd_vma target_offset
,
5138 bfd_boolean translated
)
5142 fix
= (reloc_bfd_fix
*) bfd_malloc (sizeof (reloc_bfd_fix
));
5143 fix
->src_sec
= src_sec
;
5144 fix
->src_offset
= src_offset
;
5145 fix
->src_type
= src_type
;
5146 fix
->target_sec
= target_sec
;
5147 fix
->target_offset
= target_offset
;
5148 fix
->translated
= translated
;
5155 add_fix (asection
*src_sec
, reloc_bfd_fix
*fix
)
5157 xtensa_relax_info
*relax_info
;
5159 relax_info
= get_xtensa_relax_info (src_sec
);
5160 fix
->next
= relax_info
->fix_list
;
5161 relax_info
->fix_list
= fix
;
5166 fix_compare (const void *ap
, const void *bp
)
5168 const reloc_bfd_fix
*a
= (const reloc_bfd_fix
*) ap
;
5169 const reloc_bfd_fix
*b
= (const reloc_bfd_fix
*) bp
;
5171 if (a
->src_offset
!= b
->src_offset
)
5172 return (a
->src_offset
- b
->src_offset
);
5173 return (a
->src_type
- b
->src_type
);
5178 cache_fix_array (asection
*sec
)
5180 unsigned i
, count
= 0;
5182 xtensa_relax_info
*relax_info
= get_xtensa_relax_info (sec
);
5184 if (relax_info
== NULL
)
5186 if (relax_info
->fix_list
== NULL
)
5189 for (r
= relax_info
->fix_list
; r
!= NULL
; r
= r
->next
)
5192 relax_info
->fix_array
=
5193 (reloc_bfd_fix
*) bfd_malloc (sizeof (reloc_bfd_fix
) * count
);
5194 relax_info
->fix_array_count
= count
;
5196 r
= relax_info
->fix_list
;
5197 for (i
= 0; i
< count
; i
++, r
= r
->next
)
5199 relax_info
->fix_array
[count
- 1 - i
] = *r
;
5200 relax_info
->fix_array
[count
- 1 - i
].next
= NULL
;
5203 qsort (relax_info
->fix_array
, relax_info
->fix_array_count
,
5204 sizeof (reloc_bfd_fix
), fix_compare
);
5208 static reloc_bfd_fix
*
5209 get_bfd_fix (asection
*sec
, bfd_vma offset
, unsigned type
)
5211 xtensa_relax_info
*relax_info
= get_xtensa_relax_info (sec
);
5215 if (relax_info
== NULL
)
5217 if (relax_info
->fix_list
== NULL
)
5220 if (relax_info
->fix_array
== NULL
)
5221 cache_fix_array (sec
);
5223 key
.src_offset
= offset
;
5224 key
.src_type
= type
;
5225 rv
= bsearch (&key
, relax_info
->fix_array
, relax_info
->fix_array_count
,
5226 sizeof (reloc_bfd_fix
), fix_compare
);
5231 /* Section caching. */
5233 typedef struct section_cache_struct section_cache_t
;
5235 struct section_cache_struct
5239 bfd_byte
*contents
; /* Cache of the section contents. */
5240 bfd_size_type content_length
;
5242 property_table_entry
*ptbl
; /* Cache of the section property table. */
5245 Elf_Internal_Rela
*relocs
; /* Cache of the section relocations. */
5246 unsigned reloc_count
;
5251 init_section_cache (section_cache_t
*sec_cache
)
5253 memset (sec_cache
, 0, sizeof (*sec_cache
));
5258 clear_section_cache (section_cache_t
*sec_cache
)
5262 release_contents (sec_cache
->sec
, sec_cache
->contents
);
5263 release_internal_relocs (sec_cache
->sec
, sec_cache
->relocs
);
5264 if (sec_cache
->ptbl
)
5265 free (sec_cache
->ptbl
);
5266 memset (sec_cache
, 0, sizeof (sec_cache
));
5272 section_cache_section (section_cache_t
*sec_cache
,
5274 struct bfd_link_info
*link_info
)
5277 property_table_entry
*prop_table
= NULL
;
5279 bfd_byte
*contents
= NULL
;
5280 Elf_Internal_Rela
*internal_relocs
= NULL
;
5281 bfd_size_type sec_size
;
5285 if (sec
== sec_cache
->sec
)
5289 sec_size
= bfd_get_section_limit (abfd
, sec
);
5291 /* Get the contents. */
5292 contents
= retrieve_contents (abfd
, sec
, link_info
->keep_memory
);
5293 if (contents
== NULL
&& sec_size
!= 0)
5296 /* Get the relocations. */
5297 internal_relocs
= retrieve_internal_relocs (abfd
, sec
,
5298 link_info
->keep_memory
);
5300 /* Get the entry table. */
5301 ptblsize
= xtensa_read_table_entries (abfd
, sec
, &prop_table
,
5302 XTENSA_PROP_SEC_NAME
, FALSE
);
5306 /* Fill in the new section cache. */
5307 clear_section_cache (sec_cache
);
5308 memset (sec_cache
, 0, sizeof (sec_cache
));
5310 sec_cache
->sec
= sec
;
5311 sec_cache
->contents
= contents
;
5312 sec_cache
->content_length
= sec_size
;
5313 sec_cache
->relocs
= internal_relocs
;
5314 sec_cache
->reloc_count
= sec
->reloc_count
;
5315 sec_cache
->pte_count
= ptblsize
;
5316 sec_cache
->ptbl
= prop_table
;
5321 release_contents (sec
, contents
);
5322 release_internal_relocs (sec
, internal_relocs
);
5329 /* Extended basic blocks. */
5331 /* An ebb_struct represents an Extended Basic Block. Within this
5332 range, we guarantee that all instructions are decodable, the
5333 property table entries are contiguous, and no property table
5334 specifies a segment that cannot have instructions moved. This
5335 structure contains caches of the contents, property table and
5336 relocations for the specified section for easy use. The range is
5337 specified by ranges of indices for the byte offset, property table
5338 offsets and relocation offsets. These must be consistent. */
5340 typedef struct ebb_struct ebb_t
;
5346 bfd_byte
*contents
; /* Cache of the section contents. */
5347 bfd_size_type content_length
;
5349 property_table_entry
*ptbl
; /* Cache of the section property table. */
5352 Elf_Internal_Rela
*relocs
; /* Cache of the section relocations. */
5353 unsigned reloc_count
;
5355 bfd_vma start_offset
; /* Offset in section. */
5356 unsigned start_ptbl_idx
; /* Offset in the property table. */
5357 unsigned start_reloc_idx
; /* Offset in the relocations. */
5360 unsigned end_ptbl_idx
;
5361 unsigned end_reloc_idx
;
5363 bfd_boolean ends_section
; /* Is this the last ebb in a section? */
5365 /* The unreachable property table at the end of this set of blocks;
5366 NULL if the end is not an unreachable block. */
5367 property_table_entry
*ends_unreachable
;
5371 enum ebb_target_enum
5374 EBB_DESIRE_TGT_ALIGN
,
5375 EBB_REQUIRE_TGT_ALIGN
,
5376 EBB_REQUIRE_LOOP_ALIGN
,
5381 /* proposed_action_struct is similar to the text_action_struct except
5382 that is represents a potential transformation, not one that will
5383 occur. We build a list of these for an extended basic block
5384 and use them to compute the actual actions desired. We must be
5385 careful that the entire set of actual actions we perform do not
5386 break any relocations that would fit if the actions were not
5389 typedef struct proposed_action_struct proposed_action
;
5391 struct proposed_action_struct
5393 enum ebb_target_enum align_type
; /* for the target alignment */
5394 bfd_vma alignment_pow
;
5395 text_action_t action
;
5398 bfd_boolean do_action
; /* If false, then we will not perform the action. */
5402 /* The ebb_constraint_struct keeps a set of proposed actions for an
5403 extended basic block. */
5405 typedef struct ebb_constraint_struct ebb_constraint
;
5407 struct ebb_constraint_struct
5410 bfd_boolean start_movable
;
5412 /* Bytes of extra space at the beginning if movable. */
5413 int start_extra_space
;
5415 enum ebb_target_enum start_align
;
5417 bfd_boolean end_movable
;
5419 /* Bytes of extra space at the end if movable. */
5420 int end_extra_space
;
5422 unsigned action_count
;
5423 unsigned action_allocated
;
5425 /* Array of proposed actions. */
5426 proposed_action
*actions
;
5428 /* Action alignments -- one for each proposed action. */
5429 enum ebb_target_enum
*action_aligns
;
5434 init_ebb_constraint (ebb_constraint
*c
)
5436 memset (c
, 0, sizeof (ebb_constraint
));
5441 free_ebb_constraint (ebb_constraint
*c
)
5449 init_ebb (ebb_t
*ebb
,
5452 bfd_size_type content_length
,
5453 property_table_entry
*prop_table
,
5455 Elf_Internal_Rela
*internal_relocs
,
5456 unsigned reloc_count
)
5458 memset (ebb
, 0, sizeof (ebb_t
));
5460 ebb
->contents
= contents
;
5461 ebb
->content_length
= content_length
;
5462 ebb
->ptbl
= prop_table
;
5463 ebb
->pte_count
= ptblsize
;
5464 ebb
->relocs
= internal_relocs
;
5465 ebb
->reloc_count
= reloc_count
;
5466 ebb
->start_offset
= 0;
5467 ebb
->end_offset
= ebb
->content_length
- 1;
5468 ebb
->start_ptbl_idx
= 0;
5469 ebb
->end_ptbl_idx
= ptblsize
;
5470 ebb
->start_reloc_idx
= 0;
5471 ebb
->end_reloc_idx
= reloc_count
;
5475 /* Extend the ebb to all decodable contiguous sections. The algorithm
5476 for building a basic block around an instruction is to push it
5477 forward until we hit the end of a section, an unreachable block or
5478 a block that cannot be transformed. Then we push it backwards
5479 searching for similar conditions. */
5481 static bfd_boolean
extend_ebb_bounds_forward (ebb_t
*);
5482 static bfd_boolean
extend_ebb_bounds_backward (ebb_t
*);
5483 static bfd_size_type insn_block_decodable_len
5484 (bfd_byte
*, bfd_size_type
, bfd_vma
, bfd_size_type
);
5487 extend_ebb_bounds (ebb_t
*ebb
)
5489 if (!extend_ebb_bounds_forward (ebb
))
5491 if (!extend_ebb_bounds_backward (ebb
))
5498 extend_ebb_bounds_forward (ebb_t
*ebb
)
5500 property_table_entry
*the_entry
, *new_entry
;
5502 the_entry
= &ebb
->ptbl
[ebb
->end_ptbl_idx
];
5504 /* Stop when (1) we cannot decode an instruction, (2) we are at
5505 the end of the property tables, (3) we hit a non-contiguous property
5506 table entry, (4) we hit a NO_TRANSFORM region. */
5511 bfd_size_type insn_block_len
;
5513 entry_end
= the_entry
->address
- ebb
->sec
->vma
+ the_entry
->size
;
5515 insn_block_decodable_len (ebb
->contents
, ebb
->content_length
,
5517 entry_end
- ebb
->end_offset
);
5518 if (insn_block_len
!= (entry_end
- ebb
->end_offset
))
5520 (*_bfd_error_handler
)
5521 (_("%B(%A+0x%lx): could not decode instruction; possible configuration mismatch"),
5522 ebb
->sec
->owner
, ebb
->sec
, ebb
->end_offset
+ insn_block_len
);
5525 ebb
->end_offset
+= insn_block_len
;
5527 if (ebb
->end_offset
== ebb
->sec
->size
)
5528 ebb
->ends_section
= TRUE
;
5530 /* Update the reloc counter. */
5531 while (ebb
->end_reloc_idx
+ 1 < ebb
->reloc_count
5532 && (ebb
->relocs
[ebb
->end_reloc_idx
+ 1].r_offset
5535 ebb
->end_reloc_idx
++;
5538 if (ebb
->end_ptbl_idx
+ 1 == ebb
->pte_count
)
5541 new_entry
= &ebb
->ptbl
[ebb
->end_ptbl_idx
+ 1];
5542 if (((new_entry
->flags
& XTENSA_PROP_INSN
) == 0)
5543 || ((new_entry
->flags
& XTENSA_PROP_NO_TRANSFORM
) != 0)
5544 || ((the_entry
->flags
& XTENSA_PROP_ALIGN
) != 0))
5547 if (the_entry
->address
+ the_entry
->size
!= new_entry
->address
)
5550 the_entry
= new_entry
;
5551 ebb
->end_ptbl_idx
++;
5554 /* Quick check for an unreachable or end of file just at the end. */
5555 if (ebb
->end_ptbl_idx
+ 1 == ebb
->pte_count
)
5557 if (ebb
->end_offset
== ebb
->content_length
)
5558 ebb
->ends_section
= TRUE
;
5562 new_entry
= &ebb
->ptbl
[ebb
->end_ptbl_idx
+ 1];
5563 if ((new_entry
->flags
& XTENSA_PROP_UNREACHABLE
) != 0
5564 && the_entry
->address
+ the_entry
->size
== new_entry
->address
)
5565 ebb
->ends_unreachable
= new_entry
;
5568 /* Any other ending requires exact alignment. */
5574 extend_ebb_bounds_backward (ebb_t
*ebb
)
5576 property_table_entry
*the_entry
, *new_entry
;
5578 the_entry
= &ebb
->ptbl
[ebb
->start_ptbl_idx
];
5580 /* Stop when (1) we cannot decode the instructions in the current entry.
5581 (2) we are at the beginning of the property tables, (3) we hit a
5582 non-contiguous property table entry, (4) we hit a NO_TRANSFORM region. */
5586 bfd_vma block_begin
;
5587 bfd_size_type insn_block_len
;
5589 block_begin
= the_entry
->address
- ebb
->sec
->vma
;
5591 insn_block_decodable_len (ebb
->contents
, ebb
->content_length
,
5593 ebb
->start_offset
- block_begin
);
5594 if (insn_block_len
!= ebb
->start_offset
- block_begin
)
5596 (*_bfd_error_handler
)
5597 (_("%B(%A+0x%lx): could not decode instruction; possible configuration mismatch"),
5598 ebb
->sec
->owner
, ebb
->sec
, ebb
->end_offset
+ insn_block_len
);
5601 ebb
->start_offset
-= insn_block_len
;
5603 /* Update the reloc counter. */
5604 while (ebb
->start_reloc_idx
> 0
5605 && (ebb
->relocs
[ebb
->start_reloc_idx
- 1].r_offset
5606 >= ebb
->start_offset
))
5608 ebb
->start_reloc_idx
--;
5611 if (ebb
->start_ptbl_idx
== 0)
5614 new_entry
= &ebb
->ptbl
[ebb
->start_ptbl_idx
- 1];
5615 if ((new_entry
->flags
& XTENSA_PROP_INSN
) == 0
5616 || ((new_entry
->flags
& XTENSA_PROP_NO_TRANSFORM
) != 0)
5617 || ((new_entry
->flags
& XTENSA_PROP_ALIGN
) != 0))
5619 if (new_entry
->address
+ new_entry
->size
!= the_entry
->address
)
5622 the_entry
= new_entry
;
5623 ebb
->start_ptbl_idx
--;
5629 static bfd_size_type
5630 insn_block_decodable_len (bfd_byte
*contents
,
5631 bfd_size_type content_len
,
5632 bfd_vma block_offset
,
5633 bfd_size_type block_len
)
5635 bfd_vma offset
= block_offset
;
5637 while (offset
< block_offset
+ block_len
)
5639 bfd_size_type insn_len
= 0;
5641 insn_len
= insn_decode_len (contents
, content_len
, offset
);
5643 return (offset
- block_offset
);
5646 return (offset
- block_offset
);
5651 ebb_propose_action (ebb_constraint
*c
,
5652 enum ebb_target_enum align_type
,
5653 bfd_vma alignment_pow
,
5654 text_action_t action
,
5657 bfd_boolean do_action
)
5659 proposed_action
*act
;
5661 if (c
->action_allocated
<= c
->action_count
)
5663 unsigned new_allocated
, i
;
5664 proposed_action
*new_actions
;
5666 new_allocated
= (c
->action_count
+ 2) * 2;
5667 new_actions
= (proposed_action
*)
5668 bfd_zmalloc (sizeof (proposed_action
) * new_allocated
);
5670 for (i
= 0; i
< c
->action_count
; i
++)
5671 new_actions
[i
] = c
->actions
[i
];
5674 c
->actions
= new_actions
;
5675 c
->action_allocated
= new_allocated
;
5678 act
= &c
->actions
[c
->action_count
];
5679 act
->align_type
= align_type
;
5680 act
->alignment_pow
= alignment_pow
;
5681 act
->action
= action
;
5682 act
->offset
= offset
;
5683 act
->removed_bytes
= removed_bytes
;
5684 act
->do_action
= do_action
;
5690 /* Access to internal relocations, section contents and symbols. */
5692 /* During relaxation, we need to modify relocations, section contents,
5693 and symbol definitions, and we need to keep the original values from
5694 being reloaded from the input files, i.e., we need to "pin" the
5695 modified values in memory. We also want to continue to observe the
5696 setting of the "keep-memory" flag. The following functions wrap the
5697 standard BFD functions to take care of this for us. */
5699 static Elf_Internal_Rela
*
5700 retrieve_internal_relocs (bfd
*abfd
, asection
*sec
, bfd_boolean keep_memory
)
5702 Elf_Internal_Rela
*internal_relocs
;
5704 if ((sec
->flags
& SEC_LINKER_CREATED
) != 0)
5707 internal_relocs
= elf_section_data (sec
)->relocs
;
5708 if (internal_relocs
== NULL
)
5709 internal_relocs
= (_bfd_elf_link_read_relocs
5710 (abfd
, sec
, NULL
, NULL
, keep_memory
));
5711 return internal_relocs
;
5716 pin_internal_relocs (asection
*sec
, Elf_Internal_Rela
*internal_relocs
)
5718 elf_section_data (sec
)->relocs
= internal_relocs
;
5723 release_internal_relocs (asection
*sec
, Elf_Internal_Rela
*internal_relocs
)
5726 && elf_section_data (sec
)->relocs
!= internal_relocs
)
5727 free (internal_relocs
);
5732 retrieve_contents (bfd
*abfd
, asection
*sec
, bfd_boolean keep_memory
)
5735 bfd_size_type sec_size
;
5737 sec_size
= bfd_get_section_limit (abfd
, sec
);
5738 contents
= elf_section_data (sec
)->this_hdr
.contents
;
5740 if (contents
== NULL
&& sec_size
!= 0)
5742 if (!bfd_malloc_and_get_section (abfd
, sec
, &contents
))
5749 elf_section_data (sec
)->this_hdr
.contents
= contents
;
5756 pin_contents (asection
*sec
, bfd_byte
*contents
)
5758 elf_section_data (sec
)->this_hdr
.contents
= contents
;
5763 release_contents (asection
*sec
, bfd_byte
*contents
)
5765 if (contents
&& elf_section_data (sec
)->this_hdr
.contents
!= contents
)
5770 static Elf_Internal_Sym
*
5771 retrieve_local_syms (bfd
*input_bfd
)
5773 Elf_Internal_Shdr
*symtab_hdr
;
5774 Elf_Internal_Sym
*isymbuf
;
5777 symtab_hdr
= &elf_tdata (input_bfd
)->symtab_hdr
;
5778 locsymcount
= symtab_hdr
->sh_info
;
5780 isymbuf
= (Elf_Internal_Sym
*) symtab_hdr
->contents
;
5781 if (isymbuf
== NULL
&& locsymcount
!= 0)
5782 isymbuf
= bfd_elf_get_elf_syms (input_bfd
, symtab_hdr
, locsymcount
, 0,
5785 /* Save the symbols for this input file so they won't be read again. */
5786 if (isymbuf
&& isymbuf
!= (Elf_Internal_Sym
*) symtab_hdr
->contents
)
5787 symtab_hdr
->contents
= (unsigned char *) isymbuf
;
5793 /* Code for link-time relaxation. */
5795 /* Initialization for relaxation: */
5796 static bfd_boolean
analyze_relocations (struct bfd_link_info
*);
5797 static bfd_boolean find_relaxable_sections
5798 (bfd
*, asection
*, struct bfd_link_info
*, bfd_boolean
*);
5799 static bfd_boolean collect_source_relocs
5800 (bfd
*, asection
*, struct bfd_link_info
*);
5801 static bfd_boolean is_resolvable_asm_expansion
5802 (bfd
*, asection
*, bfd_byte
*, Elf_Internal_Rela
*, struct bfd_link_info
*,
5804 static Elf_Internal_Rela
*find_associated_l32r_irel
5805 (bfd
*, asection
*, bfd_byte
*, Elf_Internal_Rela
*, Elf_Internal_Rela
*);
5806 static bfd_boolean compute_text_actions
5807 (bfd
*, asection
*, struct bfd_link_info
*);
5808 static bfd_boolean
compute_ebb_proposed_actions (ebb_constraint
*);
5809 static bfd_boolean
compute_ebb_actions (ebb_constraint
*);
5810 static bfd_boolean check_section_ebb_pcrels_fit
5811 (bfd
*, asection
*, bfd_byte
*, Elf_Internal_Rela
*, const ebb_constraint
*,
5812 const xtensa_opcode
*);
5813 static bfd_boolean
check_section_ebb_reduces (const ebb_constraint
*);
5814 static void text_action_add_proposed
5815 (text_action_list
*, const ebb_constraint
*, asection
*);
5816 static int compute_fill_extra_space (property_table_entry
*);
5819 static bfd_boolean compute_removed_literals
5820 (bfd
*, asection
*, struct bfd_link_info
*, value_map_hash_table
*);
5821 static Elf_Internal_Rela
*get_irel_at_offset
5822 (asection
*, Elf_Internal_Rela
*, bfd_vma
);
5823 static bfd_boolean is_removable_literal
5824 (const source_reloc
*, int, const source_reloc
*, int, asection
*,
5825 property_table_entry
*, int);
5826 static bfd_boolean remove_dead_literal
5827 (bfd
*, asection
*, struct bfd_link_info
*, Elf_Internal_Rela
*,
5828 Elf_Internal_Rela
*, source_reloc
*, property_table_entry
*, int);
5829 static bfd_boolean identify_literal_placement
5830 (bfd
*, asection
*, bfd_byte
*, struct bfd_link_info
*,
5831 value_map_hash_table
*, bfd_boolean
*, Elf_Internal_Rela
*, int,
5832 source_reloc
*, property_table_entry
*, int, section_cache_t
*,
5834 static bfd_boolean
relocations_reach (source_reloc
*, int, const r_reloc
*);
5835 static bfd_boolean coalesce_shared_literal
5836 (asection
*, source_reloc
*, property_table_entry
*, int, value_map
*);
5837 static bfd_boolean move_shared_literal
5838 (asection
*, struct bfd_link_info
*, source_reloc
*, property_table_entry
*,
5839 int, const r_reloc
*, const literal_value
*, section_cache_t
*);
5842 static bfd_boolean
relax_section (bfd
*, asection
*, struct bfd_link_info
*);
5843 static bfd_boolean
translate_section_fixes (asection
*);
5844 static bfd_boolean
translate_reloc_bfd_fix (reloc_bfd_fix
*);
5845 static void translate_reloc (const r_reloc
*, r_reloc
*);
5846 static void shrink_dynamic_reloc_sections
5847 (struct bfd_link_info
*, bfd
*, asection
*, Elf_Internal_Rela
*);
5848 static bfd_boolean move_literal
5849 (bfd
*, struct bfd_link_info
*, asection
*, bfd_vma
, bfd_byte
*,
5850 xtensa_relax_info
*, Elf_Internal_Rela
**, const literal_value
*);
5851 static bfd_boolean relax_property_section
5852 (bfd
*, asection
*, struct bfd_link_info
*);
5855 static bfd_boolean
relax_section_symbols (bfd
*, asection
*);
5859 elf_xtensa_relax_section (bfd
*abfd
,
5861 struct bfd_link_info
*link_info
,
5864 static value_map_hash_table
*values
= NULL
;
5865 static bfd_boolean relocations_analyzed
= FALSE
;
5866 xtensa_relax_info
*relax_info
;
5868 if (!relocations_analyzed
)
5870 /* Do some overall initialization for relaxation. */
5871 values
= value_map_hash_table_init ();
5874 relaxing_section
= TRUE
;
5875 if (!analyze_relocations (link_info
))
5877 relocations_analyzed
= TRUE
;
5881 /* Don't mess with linker-created sections. */
5882 if ((sec
->flags
& SEC_LINKER_CREATED
) != 0)
5885 relax_info
= get_xtensa_relax_info (sec
);
5886 BFD_ASSERT (relax_info
!= NULL
);
5888 switch (relax_info
->visited
)
5891 /* Note: It would be nice to fold this pass into
5892 analyze_relocations, but it is important for this step that the
5893 sections be examined in link order. */
5894 if (!compute_removed_literals (abfd
, sec
, link_info
, values
))
5901 value_map_hash_table_delete (values
);
5903 if (!relax_section (abfd
, sec
, link_info
))
5909 if (!relax_section_symbols (abfd
, sec
))
5914 relax_info
->visited
++;
5919 /* Initialization for relaxation. */
5921 /* This function is called once at the start of relaxation. It scans
5922 all the input sections and marks the ones that are relaxable (i.e.,
5923 literal sections with L32R relocations against them), and then
5924 collects source_reloc information for all the relocations against
5925 those relaxable sections. During this process, it also detects
5926 longcalls, i.e., calls relaxed by the assembler into indirect
5927 calls, that can be optimized back into direct calls. Within each
5928 extended basic block (ebb) containing an optimized longcall, it
5929 computes a set of "text actions" that can be performed to remove
5930 the L32R associated with the longcall while optionally preserving
5931 branch target alignments. */
5934 analyze_relocations (struct bfd_link_info
*link_info
)
5938 bfd_boolean is_relaxable
= FALSE
;
5940 /* Initialize the per-section relaxation info. */
5941 for (abfd
= link_info
->input_bfds
; abfd
!= NULL
; abfd
= abfd
->link_next
)
5942 for (sec
= abfd
->sections
; sec
!= NULL
; sec
= sec
->next
)
5944 init_xtensa_relax_info (sec
);
5947 /* Mark relaxable sections (and count relocations against each one). */
5948 for (abfd
= link_info
->input_bfds
; abfd
!= NULL
; abfd
= abfd
->link_next
)
5949 for (sec
= abfd
->sections
; sec
!= NULL
; sec
= sec
->next
)
5951 if (!find_relaxable_sections (abfd
, sec
, link_info
, &is_relaxable
))
5955 /* Bail out if there are no relaxable sections. */
5959 /* Allocate space for source_relocs. */
5960 for (abfd
= link_info
->input_bfds
; abfd
!= NULL
; abfd
= abfd
->link_next
)
5961 for (sec
= abfd
->sections
; sec
!= NULL
; sec
= sec
->next
)
5963 xtensa_relax_info
*relax_info
;
5965 relax_info
= get_xtensa_relax_info (sec
);
5966 if (relax_info
->is_relaxable_literal_section
5967 || relax_info
->is_relaxable_asm_section
)
5969 relax_info
->src_relocs
= (source_reloc
*)
5970 bfd_malloc (relax_info
->src_count
* sizeof (source_reloc
));
5973 relax_info
->src_count
= 0;
5976 /* Collect info on relocations against each relaxable section. */
5977 for (abfd
= link_info
->input_bfds
; abfd
!= NULL
; abfd
= abfd
->link_next
)
5978 for (sec
= abfd
->sections
; sec
!= NULL
; sec
= sec
->next
)
5980 if (!collect_source_relocs (abfd
, sec
, link_info
))
5984 /* Compute the text actions. */
5985 for (abfd
= link_info
->input_bfds
; abfd
!= NULL
; abfd
= abfd
->link_next
)
5986 for (sec
= abfd
->sections
; sec
!= NULL
; sec
= sec
->next
)
5988 if (!compute_text_actions (abfd
, sec
, link_info
))
5996 /* Find all the sections that might be relaxed. The motivation for
5997 this pass is that collect_source_relocs() needs to record _all_ the
5998 relocations that target each relaxable section. That is expensive
5999 and unnecessary unless the target section is actually going to be
6000 relaxed. This pass identifies all such sections by checking if
6001 they have L32Rs pointing to them. In the process, the total number
6002 of relocations targeting each section is also counted so that we
6003 know how much space to allocate for source_relocs against each
6004 relaxable literal section. */
6007 find_relaxable_sections (bfd
*abfd
,
6009 struct bfd_link_info
*link_info
,
6010 bfd_boolean
*is_relaxable_p
)
6012 Elf_Internal_Rela
*internal_relocs
;
6014 bfd_boolean ok
= TRUE
;
6016 xtensa_relax_info
*source_relax_info
;
6017 bfd_boolean is_l32r_reloc
;
6019 internal_relocs
= retrieve_internal_relocs (abfd
, sec
,
6020 link_info
->keep_memory
);
6021 if (internal_relocs
== NULL
)
6024 contents
= retrieve_contents (abfd
, sec
, link_info
->keep_memory
);
6025 if (contents
== NULL
&& sec
->size
!= 0)
6031 source_relax_info
= get_xtensa_relax_info (sec
);
6032 for (i
= 0; i
< sec
->reloc_count
; i
++)
6034 Elf_Internal_Rela
*irel
= &internal_relocs
[i
];
6036 asection
*target_sec
;
6037 xtensa_relax_info
*target_relax_info
;
6039 /* If this section has not already been marked as "relaxable", and
6040 if it contains any ASM_EXPAND relocations (marking expanded
6041 longcalls) that can be optimized into direct calls, then mark
6042 the section as "relaxable". */
6043 if (source_relax_info
6044 && !source_relax_info
->is_relaxable_asm_section
6045 && ELF32_R_TYPE (irel
->r_info
) == R_XTENSA_ASM_EXPAND
)
6047 bfd_boolean is_reachable
= FALSE
;
6048 if (is_resolvable_asm_expansion (abfd
, sec
, contents
, irel
,
6049 link_info
, &is_reachable
)
6052 source_relax_info
->is_relaxable_asm_section
= TRUE
;
6053 *is_relaxable_p
= TRUE
;
6057 r_reloc_init (&r_rel
, abfd
, irel
, contents
,
6058 bfd_get_section_limit (abfd
, sec
));
6060 target_sec
= r_reloc_get_section (&r_rel
);
6061 target_relax_info
= get_xtensa_relax_info (target_sec
);
6062 if (!target_relax_info
)
6065 /* Count PC-relative operand relocations against the target section.
6066 Note: The conditions tested here must match the conditions under
6067 which init_source_reloc is called in collect_source_relocs(). */
6068 is_l32r_reloc
= FALSE
;
6069 if (is_operand_relocation (ELF32_R_TYPE (irel
->r_info
)))
6071 xtensa_opcode opcode
=
6072 get_relocation_opcode (abfd
, sec
, contents
, irel
);
6073 if (opcode
!= XTENSA_UNDEFINED
)
6075 is_l32r_reloc
= (opcode
== get_l32r_opcode ());
6076 if (!is_alt_relocation (ELF32_R_TYPE (irel
->r_info
))
6078 target_relax_info
->src_count
++;
6082 if (is_l32r_reloc
&& r_reloc_is_defined (&r_rel
))
6084 /* Mark the target section as relaxable. */
6085 target_relax_info
->is_relaxable_literal_section
= TRUE
;
6086 *is_relaxable_p
= TRUE
;
6091 release_contents (sec
, contents
);
6092 release_internal_relocs (sec
, internal_relocs
);
6097 /* Record _all_ the relocations that point to relaxable sections, and
6098 get rid of ASM_EXPAND relocs by either converting them to
6099 ASM_SIMPLIFY or by removing them. */
6102 collect_source_relocs (bfd
*abfd
,
6104 struct bfd_link_info
*link_info
)
6106 Elf_Internal_Rela
*internal_relocs
;
6108 bfd_boolean ok
= TRUE
;
6110 bfd_size_type sec_size
;
6112 internal_relocs
= retrieve_internal_relocs (abfd
, sec
,
6113 link_info
->keep_memory
);
6114 if (internal_relocs
== NULL
)
6117 sec_size
= bfd_get_section_limit (abfd
, sec
);
6118 contents
= retrieve_contents (abfd
, sec
, link_info
->keep_memory
);
6119 if (contents
== NULL
&& sec_size
!= 0)
6125 /* Record relocations against relaxable literal sections. */
6126 for (i
= 0; i
< sec
->reloc_count
; i
++)
6128 Elf_Internal_Rela
*irel
= &internal_relocs
[i
];
6130 asection
*target_sec
;
6131 xtensa_relax_info
*target_relax_info
;
6133 r_reloc_init (&r_rel
, abfd
, irel
, contents
, sec_size
);
6135 target_sec
= r_reloc_get_section (&r_rel
);
6136 target_relax_info
= get_xtensa_relax_info (target_sec
);
6138 if (target_relax_info
6139 && (target_relax_info
->is_relaxable_literal_section
6140 || target_relax_info
->is_relaxable_asm_section
))
6142 xtensa_opcode opcode
= XTENSA_UNDEFINED
;
6144 bfd_boolean is_abs_literal
= FALSE
;
6146 if (is_alt_relocation (ELF32_R_TYPE (irel
->r_info
)))
6148 /* None of the current alternate relocs are PC-relative,
6149 and only PC-relative relocs matter here. However, we
6150 still need to record the opcode for literal
6152 opcode
= get_relocation_opcode (abfd
, sec
, contents
, irel
);
6153 if (opcode
== get_l32r_opcode ())
6155 is_abs_literal
= TRUE
;
6159 opcode
= XTENSA_UNDEFINED
;
6161 else if (is_operand_relocation (ELF32_R_TYPE (irel
->r_info
)))
6163 opcode
= get_relocation_opcode (abfd
, sec
, contents
, irel
);
6164 opnd
= get_relocation_opnd (opcode
, ELF32_R_TYPE (irel
->r_info
));
6167 if (opcode
!= XTENSA_UNDEFINED
)
6169 int src_next
= target_relax_info
->src_next
++;
6170 source_reloc
*s_reloc
= &target_relax_info
->src_relocs
[src_next
];
6172 init_source_reloc (s_reloc
, sec
, &r_rel
, opcode
, opnd
,
6178 /* Now get rid of ASM_EXPAND relocations. At this point, the
6179 src_relocs array for the target literal section may still be
6180 incomplete, but it must at least contain the entries for the L32R
6181 relocations associated with ASM_EXPANDs because they were just
6182 added in the preceding loop over the relocations. */
6184 for (i
= 0; i
< sec
->reloc_count
; i
++)
6186 Elf_Internal_Rela
*irel
= &internal_relocs
[i
];
6187 bfd_boolean is_reachable
;
6189 if (!is_resolvable_asm_expansion (abfd
, sec
, contents
, irel
, link_info
,
6195 Elf_Internal_Rela
*l32r_irel
;
6197 asection
*target_sec
;
6198 xtensa_relax_info
*target_relax_info
;
6200 /* Mark the source_reloc for the L32R so that it will be
6201 removed in compute_removed_literals(), along with the
6202 associated literal. */
6203 l32r_irel
= find_associated_l32r_irel (abfd
, sec
, contents
,
6204 irel
, internal_relocs
);
6205 if (l32r_irel
== NULL
)
6208 r_reloc_init (&r_rel
, abfd
, l32r_irel
, contents
, sec_size
);
6210 target_sec
= r_reloc_get_section (&r_rel
);
6211 target_relax_info
= get_xtensa_relax_info (target_sec
);
6213 if (target_relax_info
6214 && (target_relax_info
->is_relaxable_literal_section
6215 || target_relax_info
->is_relaxable_asm_section
))
6217 source_reloc
*s_reloc
;
6219 /* Search the source_relocs for the entry corresponding to
6220 the l32r_irel. Note: The src_relocs array is not yet
6221 sorted, but it wouldn't matter anyway because we're
6222 searching by source offset instead of target offset. */
6223 s_reloc
= find_source_reloc (target_relax_info
->src_relocs
,
6224 target_relax_info
->src_next
,
6226 BFD_ASSERT (s_reloc
);
6227 s_reloc
->is_null
= TRUE
;
6230 /* Convert this reloc to ASM_SIMPLIFY. */
6231 irel
->r_info
= ELF32_R_INFO (ELF32_R_SYM (irel
->r_info
),
6232 R_XTENSA_ASM_SIMPLIFY
);
6233 l32r_irel
->r_info
= ELF32_R_INFO (0, R_XTENSA_NONE
);
6235 pin_internal_relocs (sec
, internal_relocs
);
6239 /* It is resolvable but doesn't reach. We resolve now
6240 by eliminating the relocation -- the call will remain
6241 expanded into L32R/CALLX. */
6242 irel
->r_info
= ELF32_R_INFO (0, R_XTENSA_NONE
);
6243 pin_internal_relocs (sec
, internal_relocs
);
6248 release_contents (sec
, contents
);
6249 release_internal_relocs (sec
, internal_relocs
);
6254 /* Return TRUE if the asm expansion can be resolved. Generally it can
6255 be resolved on a final link or when a partial link locates it in the
6256 same section as the target. Set "is_reachable" flag if the target of
6257 the call is within the range of a direct call, given the current VMA
6258 for this section and the target section. */
6261 is_resolvable_asm_expansion (bfd
*abfd
,
6264 Elf_Internal_Rela
*irel
,
6265 struct bfd_link_info
*link_info
,
6266 bfd_boolean
*is_reachable_p
)
6268 asection
*target_sec
;
6269 bfd_vma target_offset
;
6271 xtensa_opcode opcode
, direct_call_opcode
;
6272 bfd_vma self_address
;
6273 bfd_vma dest_address
;
6274 bfd_boolean uses_l32r
;
6275 bfd_size_type sec_size
;
6277 *is_reachable_p
= FALSE
;
6279 if (contents
== NULL
)
6282 if (ELF32_R_TYPE (irel
->r_info
) != R_XTENSA_ASM_EXPAND
)
6285 sec_size
= bfd_get_section_limit (abfd
, sec
);
6286 opcode
= get_expanded_call_opcode (contents
+ irel
->r_offset
,
6287 sec_size
- irel
->r_offset
, &uses_l32r
);
6288 /* Optimization of longcalls that use CONST16 is not yet implemented. */
6292 direct_call_opcode
= swap_callx_for_call_opcode (opcode
);
6293 if (direct_call_opcode
== XTENSA_UNDEFINED
)
6296 /* Check and see that the target resolves. */
6297 r_reloc_init (&r_rel
, abfd
, irel
, contents
, sec_size
);
6298 if (!r_reloc_is_defined (&r_rel
))
6301 target_sec
= r_reloc_get_section (&r_rel
);
6302 target_offset
= r_rel
.target_offset
;
6304 /* If the target is in a shared library, then it doesn't reach. This
6305 isn't supposed to come up because the compiler should never generate
6306 non-PIC calls on systems that use shared libraries, but the linker
6307 shouldn't crash regardless. */
6308 if (!target_sec
->output_section
)
6311 /* For relocatable sections, we can only simplify when the output
6312 section of the target is the same as the output section of the
6314 if (link_info
->relocatable
6315 && (target_sec
->output_section
!= sec
->output_section
6316 || is_reloc_sym_weak (abfd
, irel
)))
6319 self_address
= (sec
->output_section
->vma
6320 + sec
->output_offset
+ irel
->r_offset
+ 3);
6321 dest_address
= (target_sec
->output_section
->vma
6322 + target_sec
->output_offset
+ target_offset
);
6324 *is_reachable_p
= pcrel_reloc_fits (direct_call_opcode
, 0,
6325 self_address
, dest_address
);
6327 if ((self_address
>> CALL_SEGMENT_BITS
) !=
6328 (dest_address
>> CALL_SEGMENT_BITS
))
6335 static Elf_Internal_Rela
*
6336 find_associated_l32r_irel (bfd
*abfd
,
6339 Elf_Internal_Rela
*other_irel
,
6340 Elf_Internal_Rela
*internal_relocs
)
6344 for (i
= 0; i
< sec
->reloc_count
; i
++)
6346 Elf_Internal_Rela
*irel
= &internal_relocs
[i
];
6348 if (irel
== other_irel
)
6350 if (irel
->r_offset
!= other_irel
->r_offset
)
6352 if (is_l32r_relocation (abfd
, sec
, contents
, irel
))
6360 static xtensa_opcode
*
6361 build_reloc_opcodes (bfd
*abfd
,
6364 Elf_Internal_Rela
*internal_relocs
)
6367 xtensa_opcode
*reloc_opcodes
=
6368 (xtensa_opcode
*) bfd_malloc (sizeof (xtensa_opcode
) * sec
->reloc_count
);
6369 for (i
= 0; i
< sec
->reloc_count
; i
++)
6371 Elf_Internal_Rela
*irel
= &internal_relocs
[i
];
6372 reloc_opcodes
[i
] = get_relocation_opcode (abfd
, sec
, contents
, irel
);
6374 return reloc_opcodes
;
6378 /* The compute_text_actions function will build a list of potential
6379 transformation actions for code in the extended basic block of each
6380 longcall that is optimized to a direct call. From this list we
6381 generate a set of actions to actually perform that optimizes for
6382 space and, if not using size_opt, maintains branch target
6385 These actions to be performed are placed on a per-section list.
6386 The actual changes are performed by relax_section() in the second
6390 compute_text_actions (bfd
*abfd
,
6392 struct bfd_link_info
*link_info
)
6394 xtensa_opcode
*reloc_opcodes
= NULL
;
6395 xtensa_relax_info
*relax_info
;
6397 Elf_Internal_Rela
*internal_relocs
;
6398 bfd_boolean ok
= TRUE
;
6400 property_table_entry
*prop_table
= 0;
6402 bfd_size_type sec_size
;
6404 relax_info
= get_xtensa_relax_info (sec
);
6405 BFD_ASSERT (relax_info
);
6406 BFD_ASSERT (relax_info
->src_next
== relax_info
->src_count
);
6408 /* Do nothing if the section contains no optimized longcalls. */
6409 if (!relax_info
->is_relaxable_asm_section
)
6412 internal_relocs
= retrieve_internal_relocs (abfd
, sec
,
6413 link_info
->keep_memory
);
6415 if (internal_relocs
)
6416 qsort (internal_relocs
, sec
->reloc_count
, sizeof (Elf_Internal_Rela
),
6417 internal_reloc_compare
);
6419 sec_size
= bfd_get_section_limit (abfd
, sec
);
6420 contents
= retrieve_contents (abfd
, sec
, link_info
->keep_memory
);
6421 if (contents
== NULL
&& sec_size
!= 0)
6427 ptblsize
= xtensa_read_table_entries (abfd
, sec
, &prop_table
,
6428 XTENSA_PROP_SEC_NAME
, FALSE
);
6435 for (i
= 0; i
< sec
->reloc_count
; i
++)
6437 Elf_Internal_Rela
*irel
= &internal_relocs
[i
];
6439 property_table_entry
*the_entry
;
6442 ebb_constraint ebb_table
;
6443 bfd_size_type simplify_size
;
6445 if (irel
&& ELF32_R_TYPE (irel
->r_info
) != R_XTENSA_ASM_SIMPLIFY
)
6447 r_offset
= irel
->r_offset
;
6449 simplify_size
= get_asm_simplify_size (contents
, sec_size
, r_offset
);
6450 if (simplify_size
== 0)
6452 (*_bfd_error_handler
)
6453 (_("%B(%A+0x%lx): could not decode instruction for XTENSA_ASM_SIMPLIFY relocation; possible configuration mismatch"),
6454 sec
->owner
, sec
, r_offset
);
6458 /* If the instruction table is not around, then don't do this
6460 the_entry
= elf_xtensa_find_property_entry (prop_table
, ptblsize
,
6461 sec
->vma
+ irel
->r_offset
);
6462 if (the_entry
== NULL
|| XTENSA_NO_NOP_REMOVAL
)
6464 text_action_add (&relax_info
->action_list
,
6465 ta_convert_longcall
, sec
, r_offset
,
6470 /* If the next longcall happens to be at the same address as an
6471 unreachable section of size 0, then skip forward. */
6472 ptbl_idx
= the_entry
- prop_table
;
6473 while ((the_entry
->flags
& XTENSA_PROP_UNREACHABLE
)
6474 && the_entry
->size
== 0
6475 && ptbl_idx
+ 1 < ptblsize
6476 && (prop_table
[ptbl_idx
+ 1].address
6477 == prop_table
[ptbl_idx
].address
))
6483 if (the_entry
->flags
& XTENSA_PROP_NO_TRANSFORM
)
6484 /* NO_REORDER is OK */
6487 init_ebb_constraint (&ebb_table
);
6488 ebb
= &ebb_table
.ebb
;
6489 init_ebb (ebb
, sec
, contents
, sec_size
, prop_table
, ptblsize
,
6490 internal_relocs
, sec
->reloc_count
);
6491 ebb
->start_offset
= r_offset
+ simplify_size
;
6492 ebb
->end_offset
= r_offset
+ simplify_size
;
6493 ebb
->start_ptbl_idx
= ptbl_idx
;
6494 ebb
->end_ptbl_idx
= ptbl_idx
;
6495 ebb
->start_reloc_idx
= i
;
6496 ebb
->end_reloc_idx
= i
;
6498 /* Precompute the opcode for each relocation. */
6499 if (reloc_opcodes
== NULL
)
6500 reloc_opcodes
= build_reloc_opcodes (abfd
, sec
, contents
,
6503 if (!extend_ebb_bounds (ebb
)
6504 || !compute_ebb_proposed_actions (&ebb_table
)
6505 || !compute_ebb_actions (&ebb_table
)
6506 || !check_section_ebb_pcrels_fit (abfd
, sec
, contents
,
6507 internal_relocs
, &ebb_table
,
6509 || !check_section_ebb_reduces (&ebb_table
))
6511 /* If anything goes wrong or we get unlucky and something does
6512 not fit, with our plan because of expansion between
6513 critical branches, just convert to a NOP. */
6515 text_action_add (&relax_info
->action_list
,
6516 ta_convert_longcall
, sec
, r_offset
, 0);
6517 i
= ebb_table
.ebb
.end_reloc_idx
;
6518 free_ebb_constraint (&ebb_table
);
6522 text_action_add_proposed (&relax_info
->action_list
, &ebb_table
, sec
);
6524 /* Update the index so we do not go looking at the relocations
6525 we have already processed. */
6526 i
= ebb_table
.ebb
.end_reloc_idx
;
6527 free_ebb_constraint (&ebb_table
);
6531 if (relax_info
->action_list
.head
)
6532 print_action_list (stderr
, &relax_info
->action_list
);
6536 release_contents (sec
, contents
);
6537 release_internal_relocs (sec
, internal_relocs
);
6541 free (reloc_opcodes
);
6547 /* Do not widen an instruction if it is preceeded by a
6548 loop opcode. It might cause misalignment. */
6551 prev_instr_is_a_loop (bfd_byte
*contents
,
6552 bfd_size_type content_length
,
6553 bfd_size_type offset
)
6555 xtensa_opcode prev_opcode
;
6559 prev_opcode
= insn_decode_opcode (contents
, content_length
, offset
-3, 0);
6560 return (xtensa_opcode_is_loop (xtensa_default_isa
, prev_opcode
) == 1);
6564 /* Find all of the possible actions for an extended basic block. */
6567 compute_ebb_proposed_actions (ebb_constraint
*ebb_table
)
6569 const ebb_t
*ebb
= &ebb_table
->ebb
;
6570 unsigned rel_idx
= ebb
->start_reloc_idx
;
6571 property_table_entry
*entry
, *start_entry
, *end_entry
;
6573 xtensa_isa isa
= xtensa_default_isa
;
6575 static xtensa_insnbuf insnbuf
= NULL
;
6576 static xtensa_insnbuf slotbuf
= NULL
;
6578 if (insnbuf
== NULL
)
6580 insnbuf
= xtensa_insnbuf_alloc (isa
);
6581 slotbuf
= xtensa_insnbuf_alloc (isa
);
6584 start_entry
= &ebb
->ptbl
[ebb
->start_ptbl_idx
];
6585 end_entry
= &ebb
->ptbl
[ebb
->end_ptbl_idx
];
6587 for (entry
= start_entry
; entry
<= end_entry
; entry
++)
6589 bfd_vma start_offset
, end_offset
;
6590 bfd_size_type insn_len
;
6592 start_offset
= entry
->address
- ebb
->sec
->vma
;
6593 end_offset
= entry
->address
+ entry
->size
- ebb
->sec
->vma
;
6595 if (entry
== start_entry
)
6596 start_offset
= ebb
->start_offset
;
6597 if (entry
== end_entry
)
6598 end_offset
= ebb
->end_offset
;
6599 offset
= start_offset
;
6601 if (offset
== entry
->address
- ebb
->sec
->vma
6602 && (entry
->flags
& XTENSA_PROP_INSN_BRANCH_TARGET
) != 0)
6604 enum ebb_target_enum align_type
= EBB_DESIRE_TGT_ALIGN
;
6605 BFD_ASSERT (offset
!= end_offset
);
6606 if (offset
== end_offset
)
6609 insn_len
= insn_decode_len (ebb
->contents
, ebb
->content_length
,
6614 if (check_branch_target_aligned_address (offset
, insn_len
))
6615 align_type
= EBB_REQUIRE_TGT_ALIGN
;
6617 ebb_propose_action (ebb_table
, align_type
, 0,
6618 ta_none
, offset
, 0, TRUE
);
6621 while (offset
!= end_offset
)
6623 Elf_Internal_Rela
*irel
;
6624 xtensa_opcode opcode
;
6626 while (rel_idx
< ebb
->end_reloc_idx
6627 && (ebb
->relocs
[rel_idx
].r_offset
< offset
6628 || (ebb
->relocs
[rel_idx
].r_offset
== offset
6629 && (ELF32_R_TYPE (ebb
->relocs
[rel_idx
].r_info
)
6630 != R_XTENSA_ASM_SIMPLIFY
))))
6633 /* Check for longcall. */
6634 irel
= &ebb
->relocs
[rel_idx
];
6635 if (irel
->r_offset
== offset
6636 && ELF32_R_TYPE (irel
->r_info
) == R_XTENSA_ASM_SIMPLIFY
)
6638 bfd_size_type simplify_size
;
6640 simplify_size
= get_asm_simplify_size (ebb
->contents
,
6641 ebb
->content_length
,
6643 if (simplify_size
== 0)
6646 ebb_propose_action (ebb_table
, EBB_NO_ALIGN
, 0,
6647 ta_convert_longcall
, offset
, 0, TRUE
);
6649 offset
+= simplify_size
;
6653 if (offset
+ MIN_INSN_LENGTH
> ebb
->content_length
)
6655 xtensa_insnbuf_from_chars (isa
, insnbuf
, &ebb
->contents
[offset
],
6656 ebb
->content_length
- offset
);
6657 fmt
= xtensa_format_decode (isa
, insnbuf
);
6658 if (fmt
== XTENSA_UNDEFINED
)
6660 insn_len
= xtensa_format_length (isa
, fmt
);
6661 if (insn_len
== (bfd_size_type
) XTENSA_UNDEFINED
)
6664 if (xtensa_format_num_slots (isa
, fmt
) != 1)
6670 xtensa_format_get_slot (isa
, fmt
, 0, insnbuf
, slotbuf
);
6671 opcode
= xtensa_opcode_decode (isa
, fmt
, 0, slotbuf
);
6672 if (opcode
== XTENSA_UNDEFINED
)
6675 if ((entry
->flags
& XTENSA_PROP_INSN_NO_DENSITY
) == 0
6676 && (entry
->flags
& XTENSA_PROP_NO_TRANSFORM
) == 0
6677 && can_narrow_instruction (slotbuf
, fmt
, opcode
) != 0)
6679 /* Add an instruction narrow action. */
6680 ebb_propose_action (ebb_table
, EBB_NO_ALIGN
, 0,
6681 ta_narrow_insn
, offset
, 0, FALSE
);
6683 else if ((entry
->flags
& XTENSA_PROP_NO_TRANSFORM
) == 0
6684 && can_widen_instruction (slotbuf
, fmt
, opcode
) != 0
6685 && ! prev_instr_is_a_loop (ebb
->contents
,
6686 ebb
->content_length
, offset
))
6688 /* Add an instruction widen action. */
6689 ebb_propose_action (ebb_table
, EBB_NO_ALIGN
, 0,
6690 ta_widen_insn
, offset
, 0, FALSE
);
6692 else if (xtensa_opcode_is_loop (xtensa_default_isa
, opcode
) == 1)
6694 /* Check for branch targets. */
6695 ebb_propose_action (ebb_table
, EBB_REQUIRE_LOOP_ALIGN
, 0,
6696 ta_none
, offset
, 0, TRUE
);
6703 if (ebb
->ends_unreachable
)
6705 ebb_propose_action (ebb_table
, EBB_NO_ALIGN
, 0,
6706 ta_fill
, ebb
->end_offset
, 0, TRUE
);
6712 (*_bfd_error_handler
)
6713 (_("%B(%A+0x%lx): could not decode instruction; possible configuration mismatch"),
6714 ebb
->sec
->owner
, ebb
->sec
, offset
);
6719 /* After all of the information has collected about the
6720 transformations possible in an EBB, compute the appropriate actions
6721 here in compute_ebb_actions. We still must check later to make
6722 sure that the actions do not break any relocations. The algorithm
6723 used here is pretty greedy. Basically, it removes as many no-ops
6724 as possible so that the end of the EBB has the same alignment
6725 characteristics as the original. First, it uses narrowing, then
6726 fill space at the end of the EBB, and finally widenings. If that
6727 does not work, it tries again with one fewer no-op removed. The
6728 optimization will only be performed if all of the branch targets
6729 that were aligned before transformation are also aligned after the
6732 When the size_opt flag is set, ignore the branch target alignments,
6733 narrow all wide instructions, and remove all no-ops unless the end
6734 of the EBB prevents it. */
6737 compute_ebb_actions (ebb_constraint
*ebb_table
)
6741 int removed_bytes
= 0;
6742 ebb_t
*ebb
= &ebb_table
->ebb
;
6743 unsigned seg_idx_start
= 0;
6744 unsigned seg_idx_end
= 0;
6746 /* We perform this like the assembler relaxation algorithm: Start by
6747 assuming all instructions are narrow and all no-ops removed; then
6750 /* For each segment of this that has a solid constraint, check to
6751 see if there are any combinations that will keep the constraint.
6753 for (seg_idx_end
= 0; seg_idx_end
< ebb_table
->action_count
; seg_idx_end
++)
6755 bfd_boolean requires_text_end_align
= FALSE
;
6756 unsigned longcall_count
= 0;
6757 unsigned longcall_convert_count
= 0;
6758 unsigned narrowable_count
= 0;
6759 unsigned narrowable_convert_count
= 0;
6760 unsigned widenable_count
= 0;
6761 unsigned widenable_convert_count
= 0;
6763 proposed_action
*action
= NULL
;
6764 int align
= (1 << ebb_table
->ebb
.sec
->alignment_power
);
6766 seg_idx_start
= seg_idx_end
;
6768 for (i
= seg_idx_start
; i
< ebb_table
->action_count
; i
++)
6770 action
= &ebb_table
->actions
[i
];
6771 if (action
->action
== ta_convert_longcall
)
6773 if (action
->action
== ta_narrow_insn
)
6775 if (action
->action
== ta_widen_insn
)
6777 if (action
->action
== ta_fill
)
6779 if (action
->align_type
== EBB_REQUIRE_LOOP_ALIGN
)
6781 if (action
->align_type
== EBB_REQUIRE_TGT_ALIGN
6782 && !elf32xtensa_size_opt
)
6787 if (seg_idx_end
== ebb_table
->action_count
&& !ebb
->ends_unreachable
)
6788 requires_text_end_align
= TRUE
;
6790 if (elf32xtensa_size_opt
&& !requires_text_end_align
6791 && action
->align_type
!= EBB_REQUIRE_LOOP_ALIGN
6792 && action
->align_type
!= EBB_REQUIRE_TGT_ALIGN
)
6794 longcall_convert_count
= longcall_count
;
6795 narrowable_convert_count
= narrowable_count
;
6796 widenable_convert_count
= 0;
6800 /* There is a constraint. Convert the max number of longcalls. */
6801 narrowable_convert_count
= 0;
6802 longcall_convert_count
= 0;
6803 widenable_convert_count
= 0;
6805 for (j
= 0; j
< longcall_count
; j
++)
6807 int removed
= (longcall_count
- j
) * 3 & (align
- 1);
6808 unsigned desire_narrow
= (align
- removed
) & (align
- 1);
6809 unsigned desire_widen
= removed
;
6810 if (desire_narrow
<= narrowable_count
)
6812 narrowable_convert_count
= desire_narrow
;
6813 narrowable_convert_count
+=
6814 (align
* ((narrowable_count
- narrowable_convert_count
)
6816 longcall_convert_count
= (longcall_count
- j
);
6817 widenable_convert_count
= 0;
6820 if (desire_widen
<= widenable_count
&& !elf32xtensa_size_opt
)
6822 narrowable_convert_count
= 0;
6823 longcall_convert_count
= longcall_count
- j
;
6824 widenable_convert_count
= desire_widen
;
6830 /* Now the number of conversions are saved. Do them. */
6831 for (i
= seg_idx_start
; i
< seg_idx_end
; i
++)
6833 action
= &ebb_table
->actions
[i
];
6834 switch (action
->action
)
6836 case ta_convert_longcall
:
6837 if (longcall_convert_count
!= 0)
6839 action
->action
= ta_remove_longcall
;
6840 action
->do_action
= TRUE
;
6841 action
->removed_bytes
+= 3;
6842 longcall_convert_count
--;
6845 case ta_narrow_insn
:
6846 if (narrowable_convert_count
!= 0)
6848 action
->do_action
= TRUE
;
6849 action
->removed_bytes
+= 1;
6850 narrowable_convert_count
--;
6854 if (widenable_convert_count
!= 0)
6856 action
->do_action
= TRUE
;
6857 action
->removed_bytes
-= 1;
6858 widenable_convert_count
--;
6867 /* Now we move on to some local opts. Try to remove each of the
6868 remaining longcalls. */
6870 if (ebb_table
->ebb
.ends_section
|| ebb_table
->ebb
.ends_unreachable
)
6873 for (i
= 0; i
< ebb_table
->action_count
; i
++)
6875 int old_removed_bytes
= removed_bytes
;
6876 proposed_action
*action
= &ebb_table
->actions
[i
];
6878 if (action
->do_action
&& action
->action
== ta_convert_longcall
)
6880 bfd_boolean bad_alignment
= FALSE
;
6882 for (j
= i
+ 1; j
< ebb_table
->action_count
; j
++)
6884 proposed_action
*new_action
= &ebb_table
->actions
[j
];
6885 bfd_vma offset
= new_action
->offset
;
6886 if (new_action
->align_type
== EBB_REQUIRE_TGT_ALIGN
)
6888 if (!check_branch_target_aligned
6889 (ebb_table
->ebb
.contents
,
6890 ebb_table
->ebb
.content_length
,
6891 offset
, offset
- removed_bytes
))
6893 bad_alignment
= TRUE
;
6897 if (new_action
->align_type
== EBB_REQUIRE_LOOP_ALIGN
)
6899 if (!check_loop_aligned (ebb_table
->ebb
.contents
,
6900 ebb_table
->ebb
.content_length
,
6902 offset
- removed_bytes
))
6904 bad_alignment
= TRUE
;
6908 if (new_action
->action
== ta_narrow_insn
6909 && !new_action
->do_action
6910 && ebb_table
->ebb
.sec
->alignment_power
== 2)
6912 /* Narrow an instruction and we are done. */
6913 new_action
->do_action
= TRUE
;
6914 new_action
->removed_bytes
+= 1;
6915 bad_alignment
= FALSE
;
6918 if (new_action
->action
== ta_widen_insn
6919 && new_action
->do_action
6920 && ebb_table
->ebb
.sec
->alignment_power
== 2)
6922 /* Narrow an instruction and we are done. */
6923 new_action
->do_action
= FALSE
;
6924 new_action
->removed_bytes
+= 1;
6925 bad_alignment
= FALSE
;
6928 if (new_action
->do_action
)
6929 removed_bytes
+= new_action
->removed_bytes
;
6933 action
->removed_bytes
+= 3;
6934 action
->action
= ta_remove_longcall
;
6935 action
->do_action
= TRUE
;
6938 removed_bytes
= old_removed_bytes
;
6939 if (action
->do_action
)
6940 removed_bytes
+= action
->removed_bytes
;
6945 for (i
= 0; i
< ebb_table
->action_count
; ++i
)
6947 proposed_action
*action
= &ebb_table
->actions
[i
];
6948 if (action
->do_action
)
6949 removed_bytes
+= action
->removed_bytes
;
6952 if ((removed_bytes
% (1 << ebb_table
->ebb
.sec
->alignment_power
)) != 0
6953 && ebb
->ends_unreachable
)
6955 proposed_action
*action
;
6959 BFD_ASSERT (ebb_table
->action_count
!= 0);
6960 action
= &ebb_table
->actions
[ebb_table
->action_count
- 1];
6961 BFD_ASSERT (action
->action
== ta_fill
);
6962 BFD_ASSERT (ebb
->ends_unreachable
->flags
& XTENSA_PROP_UNREACHABLE
);
6964 extra_space
= compute_fill_extra_space (ebb
->ends_unreachable
);
6965 br
= action
->removed_bytes
+ removed_bytes
+ extra_space
;
6966 br
= br
& ((1 << ebb
->sec
->alignment_power
) - 1);
6968 action
->removed_bytes
= extra_space
- br
;
6974 /* The xlate_map is a sorted array of address mappings designed to
6975 answer the offset_with_removed_text() query with a binary search instead
6976 of a linear search through the section's action_list. */
6978 typedef struct xlate_map_entry xlate_map_entry_t
;
6979 typedef struct xlate_map xlate_map_t
;
6981 struct xlate_map_entry
6983 unsigned orig_address
;
6984 unsigned new_address
;
6990 unsigned entry_count
;
6991 xlate_map_entry_t
*entry
;
6996 xlate_compare (const void *a_v
, const void *b_v
)
6998 const xlate_map_entry_t
*a
= (const xlate_map_entry_t
*) a_v
;
6999 const xlate_map_entry_t
*b
= (const xlate_map_entry_t
*) b_v
;
7000 if (a
->orig_address
< b
->orig_address
)
7002 if (a
->orig_address
> (b
->orig_address
+ b
->size
- 1))
7009 xlate_offset_with_removed_text (const xlate_map_t
*map
,
7010 text_action_list
*action_list
,
7013 xlate_map_entry_t tmp
;
7015 xlate_map_entry_t
*e
;
7018 return offset_with_removed_text (action_list
, offset
);
7020 if (map
->entry_count
== 0)
7023 tmp
.orig_address
= offset
;
7024 tmp
.new_address
= offset
;
7027 r
= bsearch (&offset
, map
->entry
, map
->entry_count
,
7028 sizeof (xlate_map_entry_t
), &xlate_compare
);
7029 e
= (xlate_map_entry_t
*) r
;
7031 BFD_ASSERT (e
!= NULL
);
7034 return e
->new_address
- e
->orig_address
+ offset
;
7038 /* Build a binary searchable offset translation map from a section's
7041 static xlate_map_t
*
7042 build_xlate_map (asection
*sec
, xtensa_relax_info
*relax_info
)
7044 xlate_map_t
*map
= (xlate_map_t
*) bfd_malloc (sizeof (xlate_map_t
));
7045 text_action_list
*action_list
= &relax_info
->action_list
;
7046 unsigned num_actions
= 0;
7049 xlate_map_entry_t
*current_entry
;
7054 num_actions
= action_list_count (action_list
);
7055 map
->entry
= (xlate_map_entry_t
*)
7056 bfd_malloc (sizeof (xlate_map_entry_t
) * (num_actions
+ 1));
7057 if (map
->entry
== NULL
)
7062 map
->entry_count
= 0;
7065 current_entry
= &map
->entry
[0];
7067 current_entry
->orig_address
= 0;
7068 current_entry
->new_address
= 0;
7069 current_entry
->size
= 0;
7071 for (r
= action_list
->head
; r
!= NULL
; r
= r
->next
)
7073 unsigned orig_size
= 0;
7077 case ta_remove_insn
:
7078 case ta_convert_longcall
:
7079 case ta_remove_literal
:
7080 case ta_add_literal
:
7082 case ta_remove_longcall
:
7085 case ta_narrow_insn
:
7094 current_entry
->size
=
7095 r
->offset
+ orig_size
- current_entry
->orig_address
;
7096 if (current_entry
->size
!= 0)
7101 current_entry
->orig_address
= r
->offset
+ orig_size
;
7102 removed
+= r
->removed_bytes
;
7103 current_entry
->new_address
= r
->offset
+ orig_size
- removed
;
7104 current_entry
->size
= 0;
7107 current_entry
->size
= (bfd_get_section_limit (sec
->owner
, sec
)
7108 - current_entry
->orig_address
);
7109 if (current_entry
->size
!= 0)
7116 /* Free an offset translation map. */
7119 free_xlate_map (xlate_map_t
*map
)
7121 if (map
&& map
->entry
)
7128 /* Use check_section_ebb_pcrels_fit to make sure that all of the
7129 relocations in a section will fit if a proposed set of actions
7133 check_section_ebb_pcrels_fit (bfd
*abfd
,
7136 Elf_Internal_Rela
*internal_relocs
,
7137 const ebb_constraint
*constraint
,
7138 const xtensa_opcode
*reloc_opcodes
)
7141 Elf_Internal_Rela
*irel
;
7142 xlate_map_t
*xmap
= NULL
;
7143 bfd_boolean ok
= TRUE
;
7144 xtensa_relax_info
*relax_info
;
7146 relax_info
= get_xtensa_relax_info (sec
);
7148 if (relax_info
&& sec
->reloc_count
> 100)
7150 xmap
= build_xlate_map (sec
, relax_info
);
7151 /* NULL indicates out of memory, but the slow version
7152 can still be used. */
7155 for (i
= 0; i
< sec
->reloc_count
; i
++)
7158 bfd_vma orig_self_offset
, orig_target_offset
;
7159 bfd_vma self_offset
, target_offset
;
7161 reloc_howto_type
*howto
;
7162 int self_removed_bytes
, target_removed_bytes
;
7164 irel
= &internal_relocs
[i
];
7165 r_type
= ELF32_R_TYPE (irel
->r_info
);
7167 howto
= &elf_howto_table
[r_type
];
7168 /* We maintain the required invariant: PC-relative relocations
7169 that fit before linking must fit after linking. Thus we only
7170 need to deal with relocations to the same section that are
7172 if (ELF32_R_TYPE (irel
->r_info
) == R_XTENSA_ASM_SIMPLIFY
7173 || !howto
->pc_relative
)
7176 r_reloc_init (&r_rel
, abfd
, irel
, contents
,
7177 bfd_get_section_limit (abfd
, sec
));
7179 if (r_reloc_get_section (&r_rel
) != sec
)
7182 orig_self_offset
= irel
->r_offset
;
7183 orig_target_offset
= r_rel
.target_offset
;
7185 self_offset
= orig_self_offset
;
7186 target_offset
= orig_target_offset
;
7191 xlate_offset_with_removed_text (xmap
, &relax_info
->action_list
,
7194 xlate_offset_with_removed_text (xmap
, &relax_info
->action_list
,
7195 orig_target_offset
);
7198 self_removed_bytes
= 0;
7199 target_removed_bytes
= 0;
7201 for (j
= 0; j
< constraint
->action_count
; ++j
)
7203 proposed_action
*action
= &constraint
->actions
[j
];
7204 bfd_vma offset
= action
->offset
;
7205 int removed_bytes
= action
->removed_bytes
;
7206 if (offset
< orig_self_offset
7207 || (offset
== orig_self_offset
&& action
->action
== ta_fill
7208 && action
->removed_bytes
< 0))
7209 self_removed_bytes
+= removed_bytes
;
7210 if (offset
< orig_target_offset
7211 || (offset
== orig_target_offset
&& action
->action
== ta_fill
7212 && action
->removed_bytes
< 0))
7213 target_removed_bytes
+= removed_bytes
;
7215 self_offset
-= self_removed_bytes
;
7216 target_offset
-= target_removed_bytes
;
7218 /* Try to encode it. Get the operand and check. */
7219 if (is_alt_relocation (ELF32_R_TYPE (irel
->r_info
)))
7221 /* None of the current alternate relocs are PC-relative,
7222 and only PC-relative relocs matter here. */
7226 xtensa_opcode opcode
;
7230 opcode
= reloc_opcodes
[i
];
7232 opcode
= get_relocation_opcode (abfd
, sec
, contents
, irel
);
7233 if (opcode
== XTENSA_UNDEFINED
)
7239 opnum
= get_relocation_opnd (opcode
, ELF32_R_TYPE (irel
->r_info
));
7240 if (opnum
== XTENSA_UNDEFINED
)
7246 if (!pcrel_reloc_fits (opcode
, opnum
, self_offset
, target_offset
))
7255 free_xlate_map (xmap
);
7262 check_section_ebb_reduces (const ebb_constraint
*constraint
)
7267 for (i
= 0; i
< constraint
->action_count
; i
++)
7269 const proposed_action
*action
= &constraint
->actions
[i
];
7270 if (action
->do_action
)
7271 removed
+= action
->removed_bytes
;
7281 text_action_add_proposed (text_action_list
*l
,
7282 const ebb_constraint
*ebb_table
,
7287 for (i
= 0; i
< ebb_table
->action_count
; i
++)
7289 proposed_action
*action
= &ebb_table
->actions
[i
];
7291 if (!action
->do_action
)
7293 switch (action
->action
)
7295 case ta_remove_insn
:
7296 case ta_remove_longcall
:
7297 case ta_convert_longcall
:
7298 case ta_narrow_insn
:
7301 case ta_remove_literal
:
7302 text_action_add (l
, action
->action
, sec
, action
->offset
,
7303 action
->removed_bytes
);
7316 compute_fill_extra_space (property_table_entry
*entry
)
7318 int fill_extra_space
;
7323 if ((entry
->flags
& XTENSA_PROP_UNREACHABLE
) == 0)
7326 fill_extra_space
= entry
->size
;
7327 if ((entry
->flags
& XTENSA_PROP_ALIGN
) != 0)
7329 /* Fill bytes for alignment:
7330 (2**n)-1 - (addr + (2**n)-1) & (2**n -1) */
7331 int pow
= GET_XTENSA_PROP_ALIGNMENT (entry
->flags
);
7332 int nsm
= (1 << pow
) - 1;
7333 bfd_vma addr
= entry
->address
+ entry
->size
;
7334 bfd_vma align_fill
= nsm
- ((addr
+ nsm
) & nsm
);
7335 fill_extra_space
+= align_fill
;
7337 return fill_extra_space
;
7341 /* First relaxation pass. */
7343 /* If the section contains relaxable literals, check each literal to
7344 see if it has the same value as another literal that has already
7345 been seen, either in the current section or a previous one. If so,
7346 add an entry to the per-section list of removed literals. The
7347 actual changes are deferred until the next pass. */
7350 compute_removed_literals (bfd
*abfd
,
7352 struct bfd_link_info
*link_info
,
7353 value_map_hash_table
*values
)
7355 xtensa_relax_info
*relax_info
;
7357 Elf_Internal_Rela
*internal_relocs
;
7358 source_reloc
*src_relocs
, *rel
;
7359 bfd_boolean ok
= TRUE
;
7360 property_table_entry
*prop_table
= NULL
;
7363 bfd_boolean last_loc_is_prev
= FALSE
;
7364 bfd_vma last_target_offset
= 0;
7365 section_cache_t target_sec_cache
;
7366 bfd_size_type sec_size
;
7368 init_section_cache (&target_sec_cache
);
7370 /* Do nothing if it is not a relaxable literal section. */
7371 relax_info
= get_xtensa_relax_info (sec
);
7372 BFD_ASSERT (relax_info
);
7373 if (!relax_info
->is_relaxable_literal_section
)
7376 internal_relocs
= retrieve_internal_relocs (abfd
, sec
,
7377 link_info
->keep_memory
);
7379 sec_size
= bfd_get_section_limit (abfd
, sec
);
7380 contents
= retrieve_contents (abfd
, sec
, link_info
->keep_memory
);
7381 if (contents
== NULL
&& sec_size
!= 0)
7387 /* Sort the source_relocs by target offset. */
7388 src_relocs
= relax_info
->src_relocs
;
7389 qsort (src_relocs
, relax_info
->src_count
,
7390 sizeof (source_reloc
), source_reloc_compare
);
7391 qsort (internal_relocs
, sec
->reloc_count
, sizeof (Elf_Internal_Rela
),
7392 internal_reloc_compare
);
7394 ptblsize
= xtensa_read_table_entries (abfd
, sec
, &prop_table
,
7395 XTENSA_PROP_SEC_NAME
, FALSE
);
7403 for (i
= 0; i
< relax_info
->src_count
; i
++)
7405 Elf_Internal_Rela
*irel
= NULL
;
7407 rel
= &src_relocs
[i
];
7408 if (get_l32r_opcode () != rel
->opcode
)
7410 irel
= get_irel_at_offset (sec
, internal_relocs
,
7411 rel
->r_rel
.target_offset
);
7413 /* If the relocation on this is not a simple R_XTENSA_32 or
7414 R_XTENSA_PLT then do not consider it. This may happen when
7415 the difference of two symbols is used in a literal. */
7416 if (irel
&& (ELF32_R_TYPE (irel
->r_info
) != R_XTENSA_32
7417 && ELF32_R_TYPE (irel
->r_info
) != R_XTENSA_PLT
))
7420 /* If the target_offset for this relocation is the same as the
7421 previous relocation, then we've already considered whether the
7422 literal can be coalesced. Skip to the next one.... */
7423 if (i
!= 0 && prev_i
!= -1
7424 && src_relocs
[i
-1].r_rel
.target_offset
== rel
->r_rel
.target_offset
)
7428 if (last_loc_is_prev
&&
7429 last_target_offset
+ 4 != rel
->r_rel
.target_offset
)
7430 last_loc_is_prev
= FALSE
;
7432 /* Check if the relocation was from an L32R that is being removed
7433 because a CALLX was converted to a direct CALL, and check if
7434 there are no other relocations to the literal. */
7435 if (is_removable_literal (rel
, i
, src_relocs
, relax_info
->src_count
,
7436 sec
, prop_table
, ptblsize
))
7438 if (!remove_dead_literal (abfd
, sec
, link_info
, internal_relocs
,
7439 irel
, rel
, prop_table
, ptblsize
))
7444 last_target_offset
= rel
->r_rel
.target_offset
;
7448 if (!identify_literal_placement (abfd
, sec
, contents
, link_info
,
7450 &last_loc_is_prev
, irel
,
7451 relax_info
->src_count
- i
, rel
,
7452 prop_table
, ptblsize
,
7453 &target_sec_cache
, rel
->is_abs_literal
))
7458 last_target_offset
= rel
->r_rel
.target_offset
;
7462 print_removed_literals (stderr
, &relax_info
->removed_list
);
7463 print_action_list (stderr
, &relax_info
->action_list
);
7467 if (prop_table
) free (prop_table
);
7468 clear_section_cache (&target_sec_cache
);
7470 release_contents (sec
, contents
);
7471 release_internal_relocs (sec
, internal_relocs
);
7476 static Elf_Internal_Rela
*
7477 get_irel_at_offset (asection
*sec
,
7478 Elf_Internal_Rela
*internal_relocs
,
7482 Elf_Internal_Rela
*irel
;
7484 Elf_Internal_Rela key
;
7486 if (!internal_relocs
)
7489 key
.r_offset
= offset
;
7490 irel
= bsearch (&key
, internal_relocs
, sec
->reloc_count
,
7491 sizeof (Elf_Internal_Rela
), internal_reloc_matches
);
7495 /* bsearch does not guarantee which will be returned if there are
7496 multiple matches. We need the first that is not an alignment. */
7497 i
= irel
- internal_relocs
;
7500 if (internal_relocs
[i
-1].r_offset
!= offset
)
7504 for ( ; i
< sec
->reloc_count
; i
++)
7506 irel
= &internal_relocs
[i
];
7507 r_type
= ELF32_R_TYPE (irel
->r_info
);
7508 if (irel
->r_offset
== offset
&& r_type
!= R_XTENSA_NONE
)
7517 is_removable_literal (const source_reloc
*rel
,
7519 const source_reloc
*src_relocs
,
7522 property_table_entry
*prop_table
,
7525 const source_reloc
*curr_rel
;
7526 property_table_entry
*entry
;
7531 entry
= elf_xtensa_find_property_entry (prop_table
, ptblsize
,
7532 sec
->vma
+ rel
->r_rel
.target_offset
);
7533 if (entry
&& (entry
->flags
& XTENSA_PROP_NO_TRANSFORM
))
7536 for (++i
; i
< src_count
; ++i
)
7538 curr_rel
= &src_relocs
[i
];
7539 /* If all others have the same target offset.... */
7540 if (curr_rel
->r_rel
.target_offset
!= rel
->r_rel
.target_offset
)
7543 if (!curr_rel
->is_null
7544 && !xtensa_is_property_section (curr_rel
->source_sec
)
7545 && !(curr_rel
->source_sec
->flags
& SEC_DEBUGGING
))
7553 remove_dead_literal (bfd
*abfd
,
7555 struct bfd_link_info
*link_info
,
7556 Elf_Internal_Rela
*internal_relocs
,
7557 Elf_Internal_Rela
*irel
,
7559 property_table_entry
*prop_table
,
7562 property_table_entry
*entry
;
7563 xtensa_relax_info
*relax_info
;
7565 relax_info
= get_xtensa_relax_info (sec
);
7569 entry
= elf_xtensa_find_property_entry (prop_table
, ptblsize
,
7570 sec
->vma
+ rel
->r_rel
.target_offset
);
7572 /* Mark the unused literal so that it will be removed. */
7573 add_removed_literal (&relax_info
->removed_list
, &rel
->r_rel
, NULL
);
7575 text_action_add (&relax_info
->action_list
,
7576 ta_remove_literal
, sec
, rel
->r_rel
.target_offset
, 4);
7578 /* If the section is 4-byte aligned, do not add fill. */
7579 if (sec
->alignment_power
> 2)
7581 int fill_extra_space
;
7582 bfd_vma entry_sec_offset
;
7584 property_table_entry
*the_add_entry
;
7588 entry_sec_offset
= entry
->address
- sec
->vma
+ entry
->size
;
7590 entry_sec_offset
= rel
->r_rel
.target_offset
+ 4;
7592 /* If the literal range is at the end of the section,
7594 the_add_entry
= elf_xtensa_find_property_entry (prop_table
, ptblsize
,
7596 fill_extra_space
= compute_fill_extra_space (the_add_entry
);
7598 fa
= find_fill_action (&relax_info
->action_list
, sec
, entry_sec_offset
);
7599 removed_diff
= compute_removed_action_diff (fa
, sec
, entry_sec_offset
,
7600 -4, fill_extra_space
);
7602 adjust_fill_action (fa
, removed_diff
);
7604 text_action_add (&relax_info
->action_list
,
7605 ta_fill
, sec
, entry_sec_offset
, removed_diff
);
7608 /* Zero out the relocation on this literal location. */
7611 if (elf_hash_table (link_info
)->dynamic_sections_created
)
7612 shrink_dynamic_reloc_sections (link_info
, abfd
, sec
, irel
);
7614 irel
->r_info
= ELF32_R_INFO (0, R_XTENSA_NONE
);
7615 pin_internal_relocs (sec
, internal_relocs
);
7618 /* Do not modify "last_loc_is_prev". */
7624 identify_literal_placement (bfd
*abfd
,
7627 struct bfd_link_info
*link_info
,
7628 value_map_hash_table
*values
,
7629 bfd_boolean
*last_loc_is_prev_p
,
7630 Elf_Internal_Rela
*irel
,
7631 int remaining_src_rels
,
7633 property_table_entry
*prop_table
,
7635 section_cache_t
*target_sec_cache
,
7636 bfd_boolean is_abs_literal
)
7640 xtensa_relax_info
*relax_info
;
7641 bfd_boolean literal_placed
= FALSE
;
7643 unsigned long value
;
7644 bfd_boolean final_static_link
;
7645 bfd_size_type sec_size
;
7647 relax_info
= get_xtensa_relax_info (sec
);
7651 sec_size
= bfd_get_section_limit (abfd
, sec
);
7654 (!link_info
->relocatable
7655 && !elf_hash_table (link_info
)->dynamic_sections_created
);
7657 /* The placement algorithm first checks to see if the literal is
7658 already in the value map. If so and the value map is reachable
7659 from all uses, then the literal is moved to that location. If
7660 not, then we identify the last location where a fresh literal was
7661 placed. If the literal can be safely moved there, then we do so.
7662 If not, then we assume that the literal is not to move and leave
7663 the literal where it is, marking it as the last literal
7666 /* Find the literal value. */
7668 r_reloc_init (&r_rel
, abfd
, irel
, contents
, sec_size
);
7671 BFD_ASSERT (rel
->r_rel
.target_offset
< sec_size
);
7672 value
= bfd_get_32 (abfd
, contents
+ rel
->r_rel
.target_offset
);
7674 init_literal_value (&val
, &r_rel
, value
, is_abs_literal
);
7676 /* Check if we've seen another literal with the same value that
7677 is in the same output section. */
7678 val_map
= value_map_get_cached_value (values
, &val
, final_static_link
);
7681 && (r_reloc_get_section (&val_map
->loc
)->output_section
7682 == sec
->output_section
)
7683 && relocations_reach (rel
, remaining_src_rels
, &val_map
->loc
)
7684 && coalesce_shared_literal (sec
, rel
, prop_table
, ptblsize
, val_map
))
7686 /* No change to last_loc_is_prev. */
7687 literal_placed
= TRUE
;
7690 /* For relocatable links, do not try to move literals. To do it
7691 correctly might increase the number of relocations in an input
7692 section making the default relocatable linking fail. */
7693 if (!link_info
->relocatable
&& !literal_placed
7694 && values
->has_last_loc
&& !(*last_loc_is_prev_p
))
7696 asection
*target_sec
= r_reloc_get_section (&values
->last_loc
);
7697 if (target_sec
&& target_sec
->output_section
== sec
->output_section
)
7699 /* Increment the virtual offset. */
7700 r_reloc try_loc
= values
->last_loc
;
7701 try_loc
.virtual_offset
+= 4;
7703 /* There is a last loc that was in the same output section. */
7704 if (relocations_reach (rel
, remaining_src_rels
, &try_loc
)
7705 && move_shared_literal (sec
, link_info
, rel
,
7706 prop_table
, ptblsize
,
7707 &try_loc
, &val
, target_sec_cache
))
7709 values
->last_loc
.virtual_offset
+= 4;
7710 literal_placed
= TRUE
;
7712 val_map
= add_value_map (values
, &val
, &try_loc
,
7715 val_map
->loc
= try_loc
;
7720 if (!literal_placed
)
7722 /* Nothing worked, leave the literal alone but update the last loc. */
7723 values
->has_last_loc
= TRUE
;
7724 values
->last_loc
= rel
->r_rel
;
7726 val_map
= add_value_map (values
, &val
, &rel
->r_rel
, final_static_link
);
7728 val_map
->loc
= rel
->r_rel
;
7729 *last_loc_is_prev_p
= TRUE
;
7736 /* Check if the original relocations (presumably on L32R instructions)
7737 identified by reloc[0..N] can be changed to reference the literal
7738 identified by r_rel. If r_rel is out of range for any of the
7739 original relocations, then we don't want to coalesce the original
7740 literal with the one at r_rel. We only check reloc[0..N], where the
7741 offsets are all the same as for reloc[0] (i.e., they're all
7742 referencing the same literal) and where N is also bounded by the
7743 number of remaining entries in the "reloc" array. The "reloc" array
7744 is sorted by target offset so we know all the entries for the same
7745 literal will be contiguous. */
7748 relocations_reach (source_reloc
*reloc
,
7749 int remaining_relocs
,
7750 const r_reloc
*r_rel
)
7752 bfd_vma from_offset
, source_address
, dest_address
;
7756 if (!r_reloc_is_defined (r_rel
))
7759 sec
= r_reloc_get_section (r_rel
);
7760 from_offset
= reloc
[0].r_rel
.target_offset
;
7762 for (i
= 0; i
< remaining_relocs
; i
++)
7764 if (reloc
[i
].r_rel
.target_offset
!= from_offset
)
7767 /* Ignore relocations that have been removed. */
7768 if (reloc
[i
].is_null
)
7771 /* The original and new output section for these must be the same
7772 in order to coalesce. */
7773 if (r_reloc_get_section (&reloc
[i
].r_rel
)->output_section
7774 != sec
->output_section
)
7777 /* Absolute literals in the same output section can always be
7779 if (reloc
[i
].is_abs_literal
)
7782 /* A literal with no PC-relative relocations can be moved anywhere. */
7783 if (reloc
[i
].opnd
!= -1)
7785 /* Otherwise, check to see that it fits. */
7786 source_address
= (reloc
[i
].source_sec
->output_section
->vma
7787 + reloc
[i
].source_sec
->output_offset
7788 + reloc
[i
].r_rel
.rela
.r_offset
);
7789 dest_address
= (sec
->output_section
->vma
7790 + sec
->output_offset
7791 + r_rel
->target_offset
);
7793 if (!pcrel_reloc_fits (reloc
[i
].opcode
, reloc
[i
].opnd
,
7794 source_address
, dest_address
))
7803 /* Move a literal to another literal location because it is
7804 the same as the other literal value. */
7807 coalesce_shared_literal (asection
*sec
,
7809 property_table_entry
*prop_table
,
7813 property_table_entry
*entry
;
7815 property_table_entry
*the_add_entry
;
7817 xtensa_relax_info
*relax_info
;
7819 relax_info
= get_xtensa_relax_info (sec
);
7823 entry
= elf_xtensa_find_property_entry
7824 (prop_table
, ptblsize
, sec
->vma
+ rel
->r_rel
.target_offset
);
7825 if (entry
&& (entry
->flags
& XTENSA_PROP_NO_TRANSFORM
))
7828 /* Mark that the literal will be coalesced. */
7829 add_removed_literal (&relax_info
->removed_list
, &rel
->r_rel
, &val_map
->loc
);
7831 text_action_add (&relax_info
->action_list
,
7832 ta_remove_literal
, sec
, rel
->r_rel
.target_offset
, 4);
7834 /* If the section is 4-byte aligned, do not add fill. */
7835 if (sec
->alignment_power
> 2)
7837 int fill_extra_space
;
7838 bfd_vma entry_sec_offset
;
7841 entry_sec_offset
= entry
->address
- sec
->vma
+ entry
->size
;
7843 entry_sec_offset
= rel
->r_rel
.target_offset
+ 4;
7845 /* If the literal range is at the end of the section,
7847 fill_extra_space
= 0;
7848 the_add_entry
= elf_xtensa_find_property_entry (prop_table
, ptblsize
,
7850 if (the_add_entry
&& (the_add_entry
->flags
& XTENSA_PROP_UNREACHABLE
))
7851 fill_extra_space
= the_add_entry
->size
;
7853 fa
= find_fill_action (&relax_info
->action_list
, sec
, entry_sec_offset
);
7854 removed_diff
= compute_removed_action_diff (fa
, sec
, entry_sec_offset
,
7855 -4, fill_extra_space
);
7857 adjust_fill_action (fa
, removed_diff
);
7859 text_action_add (&relax_info
->action_list
,
7860 ta_fill
, sec
, entry_sec_offset
, removed_diff
);
7867 /* Move a literal to another location. This may actually increase the
7868 total amount of space used because of alignments so we need to do
7869 this carefully. Also, it may make a branch go out of range. */
7872 move_shared_literal (asection
*sec
,
7873 struct bfd_link_info
*link_info
,
7875 property_table_entry
*prop_table
,
7877 const r_reloc
*target_loc
,
7878 const literal_value
*lit_value
,
7879 section_cache_t
*target_sec_cache
)
7881 property_table_entry
*the_add_entry
, *src_entry
, *target_entry
= NULL
;
7882 text_action
*fa
, *target_fa
;
7884 xtensa_relax_info
*relax_info
, *target_relax_info
;
7885 asection
*target_sec
;
7887 ebb_constraint ebb_table
;
7888 bfd_boolean relocs_fit
;
7890 /* If this routine always returns FALSE, the literals that cannot be
7891 coalesced will not be moved. */
7892 if (elf32xtensa_no_literal_movement
)
7895 relax_info
= get_xtensa_relax_info (sec
);
7899 target_sec
= r_reloc_get_section (target_loc
);
7900 target_relax_info
= get_xtensa_relax_info (target_sec
);
7902 /* Literals to undefined sections may not be moved because they
7903 must report an error. */
7904 if (bfd_is_und_section (target_sec
))
7907 src_entry
= elf_xtensa_find_property_entry
7908 (prop_table
, ptblsize
, sec
->vma
+ rel
->r_rel
.target_offset
);
7910 if (!section_cache_section (target_sec_cache
, target_sec
, link_info
))
7913 target_entry
= elf_xtensa_find_property_entry
7914 (target_sec_cache
->ptbl
, target_sec_cache
->pte_count
,
7915 target_sec
->vma
+ target_loc
->target_offset
);
7920 /* Make sure that we have not broken any branches. */
7923 init_ebb_constraint (&ebb_table
);
7924 ebb
= &ebb_table
.ebb
;
7925 init_ebb (ebb
, target_sec_cache
->sec
, target_sec_cache
->contents
,
7926 target_sec_cache
->content_length
,
7927 target_sec_cache
->ptbl
, target_sec_cache
->pte_count
,
7928 target_sec_cache
->relocs
, target_sec_cache
->reloc_count
);
7930 /* Propose to add 4 bytes + worst-case alignment size increase to
7932 ebb_propose_action (&ebb_table
, EBB_NO_ALIGN
, 0,
7933 ta_fill
, target_loc
->target_offset
,
7934 -4 - (1 << target_sec
->alignment_power
), TRUE
);
7936 /* Check all of the PC-relative relocations to make sure they still fit. */
7937 relocs_fit
= check_section_ebb_pcrels_fit (target_sec
->owner
, target_sec
,
7938 target_sec_cache
->contents
,
7939 target_sec_cache
->relocs
,
7945 text_action_add_literal (&target_relax_info
->action_list
,
7946 ta_add_literal
, target_loc
, lit_value
, -4);
7948 if (target_sec
->alignment_power
> 2 && target_entry
!= src_entry
)
7950 /* May need to add or remove some fill to maintain alignment. */
7951 int fill_extra_space
;
7952 bfd_vma entry_sec_offset
;
7955 target_entry
->address
- target_sec
->vma
+ target_entry
->size
;
7957 /* If the literal range is at the end of the section,
7959 fill_extra_space
= 0;
7961 elf_xtensa_find_property_entry (target_sec_cache
->ptbl
,
7962 target_sec_cache
->pte_count
,
7964 if (the_add_entry
&& (the_add_entry
->flags
& XTENSA_PROP_UNREACHABLE
))
7965 fill_extra_space
= the_add_entry
->size
;
7967 target_fa
= find_fill_action (&target_relax_info
->action_list
,
7968 target_sec
, entry_sec_offset
);
7969 removed_diff
= compute_removed_action_diff (target_fa
, target_sec
,
7970 entry_sec_offset
, 4,
7973 adjust_fill_action (target_fa
, removed_diff
);
7975 text_action_add (&target_relax_info
->action_list
,
7976 ta_fill
, target_sec
, entry_sec_offset
, removed_diff
);
7979 /* Mark that the literal will be moved to the new location. */
7980 add_removed_literal (&relax_info
->removed_list
, &rel
->r_rel
, target_loc
);
7982 /* Remove the literal. */
7983 text_action_add (&relax_info
->action_list
,
7984 ta_remove_literal
, sec
, rel
->r_rel
.target_offset
, 4);
7986 /* If the section is 4-byte aligned, do not add fill. */
7987 if (sec
->alignment_power
> 2 && target_entry
!= src_entry
)
7989 int fill_extra_space
;
7990 bfd_vma entry_sec_offset
;
7993 entry_sec_offset
= src_entry
->address
- sec
->vma
+ src_entry
->size
;
7995 entry_sec_offset
= rel
->r_rel
.target_offset
+4;
7997 /* If the literal range is at the end of the section,
7999 fill_extra_space
= 0;
8000 the_add_entry
= elf_xtensa_find_property_entry (prop_table
, ptblsize
,
8002 if (the_add_entry
&& (the_add_entry
->flags
& XTENSA_PROP_UNREACHABLE
))
8003 fill_extra_space
= the_add_entry
->size
;
8005 fa
= find_fill_action (&relax_info
->action_list
, sec
, entry_sec_offset
);
8006 removed_diff
= compute_removed_action_diff (fa
, sec
, entry_sec_offset
,
8007 -4, fill_extra_space
);
8009 adjust_fill_action (fa
, removed_diff
);
8011 text_action_add (&relax_info
->action_list
,
8012 ta_fill
, sec
, entry_sec_offset
, removed_diff
);
8019 /* Second relaxation pass. */
8021 /* Modify all of the relocations to point to the right spot, and if this
8022 is a relaxable section, delete the unwanted literals and fix the
8026 relax_section (bfd
*abfd
, asection
*sec
, struct bfd_link_info
*link_info
)
8028 Elf_Internal_Rela
*internal_relocs
;
8029 xtensa_relax_info
*relax_info
;
8031 bfd_boolean ok
= TRUE
;
8033 bfd_boolean rv
= FALSE
;
8034 bfd_boolean virtual_action
;
8035 bfd_size_type sec_size
;
8037 sec_size
= bfd_get_section_limit (abfd
, sec
);
8038 relax_info
= get_xtensa_relax_info (sec
);
8039 BFD_ASSERT (relax_info
);
8041 /* First translate any of the fixes that have been added already. */
8042 translate_section_fixes (sec
);
8044 /* Handle property sections (e.g., literal tables) specially. */
8045 if (xtensa_is_property_section (sec
))
8047 BFD_ASSERT (!relax_info
->is_relaxable_literal_section
);
8048 return relax_property_section (abfd
, sec
, link_info
);
8051 internal_relocs
= retrieve_internal_relocs (abfd
, sec
,
8052 link_info
->keep_memory
);
8053 contents
= retrieve_contents (abfd
, sec
, link_info
->keep_memory
);
8054 if (contents
== NULL
&& sec_size
!= 0)
8060 if (internal_relocs
)
8062 for (i
= 0; i
< sec
->reloc_count
; i
++)
8064 Elf_Internal_Rela
*irel
;
8065 xtensa_relax_info
*target_relax_info
;
8066 bfd_vma source_offset
, old_source_offset
;
8069 asection
*target_sec
;
8071 /* Locally change the source address.
8072 Translate the target to the new target address.
8073 If it points to this section and has been removed,
8077 irel
= &internal_relocs
[i
];
8078 source_offset
= irel
->r_offset
;
8079 old_source_offset
= source_offset
;
8081 r_type
= ELF32_R_TYPE (irel
->r_info
);
8082 r_reloc_init (&r_rel
, abfd
, irel
, contents
,
8083 bfd_get_section_limit (abfd
, sec
));
8085 /* If this section could have changed then we may need to
8086 change the relocation's offset. */
8088 if (relax_info
->is_relaxable_literal_section
8089 || relax_info
->is_relaxable_asm_section
)
8091 if (r_type
!= R_XTENSA_NONE
8092 && find_removed_literal (&relax_info
->removed_list
,
8095 /* Remove this relocation. */
8096 if (elf_hash_table (link_info
)->dynamic_sections_created
)
8097 shrink_dynamic_reloc_sections (link_info
, abfd
, sec
, irel
);
8098 irel
->r_info
= ELF32_R_INFO (0, R_XTENSA_NONE
);
8099 irel
->r_offset
= offset_with_removed_text
8100 (&relax_info
->action_list
, irel
->r_offset
);
8101 pin_internal_relocs (sec
, internal_relocs
);
8105 if (r_type
== R_XTENSA_ASM_SIMPLIFY
)
8107 text_action
*action
=
8108 find_insn_action (&relax_info
->action_list
,
8110 if (action
&& (action
->action
== ta_convert_longcall
8111 || action
->action
== ta_remove_longcall
))
8113 bfd_reloc_status_type retval
;
8114 char *error_message
= NULL
;
8116 retval
= contract_asm_expansion (contents
, sec_size
,
8117 irel
, &error_message
);
8118 if (retval
!= bfd_reloc_ok
)
8120 (*link_info
->callbacks
->reloc_dangerous
)
8121 (link_info
, error_message
, abfd
, sec
,
8125 /* Update the action so that the code that moves
8126 the contents will do the right thing. */
8127 if (action
->action
== ta_remove_longcall
)
8128 action
->action
= ta_remove_insn
;
8130 action
->action
= ta_none
;
8131 /* Refresh the info in the r_rel. */
8132 r_reloc_init (&r_rel
, abfd
, irel
, contents
, sec_size
);
8133 r_type
= ELF32_R_TYPE (irel
->r_info
);
8137 source_offset
= offset_with_removed_text
8138 (&relax_info
->action_list
, irel
->r_offset
);
8139 irel
->r_offset
= source_offset
;
8142 /* If the target section could have changed then
8143 we may need to change the relocation's target offset. */
8145 target_sec
= r_reloc_get_section (&r_rel
);
8146 target_relax_info
= get_xtensa_relax_info (target_sec
);
8148 if (target_relax_info
8149 && (target_relax_info
->is_relaxable_literal_section
8150 || target_relax_info
->is_relaxable_asm_section
))
8154 bfd_vma addend_displacement
;
8156 translate_reloc (&r_rel
, &new_reloc
);
8158 if (r_type
== R_XTENSA_DIFF8
8159 || r_type
== R_XTENSA_DIFF16
8160 || r_type
== R_XTENSA_DIFF32
)
8162 bfd_vma diff_value
= 0, new_end_offset
, diff_mask
= 0;
8164 if (bfd_get_section_limit (abfd
, sec
) < old_source_offset
)
8166 (*link_info
->callbacks
->reloc_dangerous
)
8167 (link_info
, _("invalid relocation address"),
8168 abfd
, sec
, old_source_offset
);
8174 case R_XTENSA_DIFF8
:
8176 bfd_get_8 (abfd
, &contents
[old_source_offset
]);
8178 case R_XTENSA_DIFF16
:
8180 bfd_get_16 (abfd
, &contents
[old_source_offset
]);
8182 case R_XTENSA_DIFF32
:
8184 bfd_get_32 (abfd
, &contents
[old_source_offset
]);
8188 new_end_offset
= offset_with_removed_text
8189 (&target_relax_info
->action_list
,
8190 r_rel
.target_offset
+ diff_value
);
8191 diff_value
= new_end_offset
- new_reloc
.target_offset
;
8195 case R_XTENSA_DIFF8
:
8197 bfd_put_8 (abfd
, diff_value
,
8198 &contents
[old_source_offset
]);
8200 case R_XTENSA_DIFF16
:
8202 bfd_put_16 (abfd
, diff_value
,
8203 &contents
[old_source_offset
]);
8205 case R_XTENSA_DIFF32
:
8206 diff_mask
= 0xffffffff;
8207 bfd_put_32 (abfd
, diff_value
,
8208 &contents
[old_source_offset
]);
8212 /* Check for overflow. */
8213 if ((diff_value
& ~diff_mask
) != 0)
8215 (*link_info
->callbacks
->reloc_dangerous
)
8216 (link_info
, _("overflow after relaxation"),
8217 abfd
, sec
, old_source_offset
);
8221 pin_contents (sec
, contents
);
8224 /* FIXME: If the relocation still references a section in
8225 the same input file, the relocation should be modified
8226 directly instead of adding a "fix" record. */
8228 addend_displacement
=
8229 new_reloc
.target_offset
+ new_reloc
.virtual_offset
;
8231 fix
= reloc_bfd_fix_init (sec
, source_offset
, r_type
,
8232 r_reloc_get_section (&new_reloc
),
8233 addend_displacement
, TRUE
);
8237 pin_internal_relocs (sec
, internal_relocs
);
8241 if ((relax_info
->is_relaxable_literal_section
8242 || relax_info
->is_relaxable_asm_section
)
8243 && relax_info
->action_list
.head
)
8245 /* Walk through the planned actions and build up a table
8246 of move, copy and fill records. Use the move, copy and
8247 fill records to perform the actions once. */
8249 bfd_size_type size
= sec
->size
;
8251 bfd_size_type final_size
, copy_size
, orig_insn_size
;
8252 bfd_byte
*scratch
= NULL
;
8253 bfd_byte
*dup_contents
= NULL
;
8254 bfd_size_type orig_size
= size
;
8255 bfd_vma orig_dot
= 0;
8256 bfd_vma orig_dot_copied
= 0; /* Byte copied already from
8257 orig dot in physical memory. */
8258 bfd_vma orig_dot_vo
= 0; /* Virtual offset from orig_dot. */
8259 bfd_vma dup_dot
= 0;
8261 text_action
*action
= relax_info
->action_list
.head
;
8263 final_size
= sec
->size
;
8264 for (action
= relax_info
->action_list
.head
; action
;
8265 action
= action
->next
)
8267 final_size
-= action
->removed_bytes
;
8270 scratch
= (bfd_byte
*) bfd_zmalloc (final_size
);
8271 dup_contents
= (bfd_byte
*) bfd_zmalloc (final_size
);
8273 /* The dot is the current fill location. */
8275 print_action_list (stderr
, &relax_info
->action_list
);
8278 for (action
= relax_info
->action_list
.head
; action
;
8279 action
= action
->next
)
8281 virtual_action
= FALSE
;
8282 if (action
->offset
> orig_dot
)
8284 orig_dot
+= orig_dot_copied
;
8285 orig_dot_copied
= 0;
8287 /* Out of the virtual world. */
8290 if (action
->offset
> orig_dot
)
8292 copy_size
= action
->offset
- orig_dot
;
8293 memmove (&dup_contents
[dup_dot
], &contents
[orig_dot
], copy_size
);
8294 orig_dot
+= copy_size
;
8295 dup_dot
+= copy_size
;
8296 BFD_ASSERT (action
->offset
== orig_dot
);
8298 else if (action
->offset
< orig_dot
)
8300 if (action
->action
== ta_fill
8301 && action
->offset
- action
->removed_bytes
== orig_dot
)
8303 /* This is OK because the fill only effects the dup_dot. */
8305 else if (action
->action
== ta_add_literal
)
8307 /* TBD. Might need to handle this. */
8310 if (action
->offset
== orig_dot
)
8312 if (action
->virtual_offset
> orig_dot_vo
)
8314 if (orig_dot_vo
== 0)
8316 /* Need to copy virtual_offset bytes. Probably four. */
8317 copy_size
= action
->virtual_offset
- orig_dot_vo
;
8318 memmove (&dup_contents
[dup_dot
],
8319 &contents
[orig_dot
], copy_size
);
8320 orig_dot_copied
= copy_size
;
8321 dup_dot
+= copy_size
;
8323 virtual_action
= TRUE
;
8326 BFD_ASSERT (action
->virtual_offset
<= orig_dot_vo
);
8328 switch (action
->action
)
8330 case ta_remove_literal
:
8331 case ta_remove_insn
:
8332 BFD_ASSERT (action
->removed_bytes
>= 0);
8333 orig_dot
+= action
->removed_bytes
;
8336 case ta_narrow_insn
:
8339 memmove (scratch
, &contents
[orig_dot
], orig_insn_size
);
8340 BFD_ASSERT (action
->removed_bytes
== 1);
8341 rv
= narrow_instruction (scratch
, final_size
, 0);
8343 memmove (&dup_contents
[dup_dot
], scratch
, copy_size
);
8344 orig_dot
+= orig_insn_size
;
8345 dup_dot
+= copy_size
;
8349 if (action
->removed_bytes
>= 0)
8350 orig_dot
+= action
->removed_bytes
;
8353 /* Already zeroed in dup_contents. Just bump the
8355 dup_dot
+= (-action
->removed_bytes
);
8360 BFD_ASSERT (action
->removed_bytes
== 0);
8363 case ta_convert_longcall
:
8364 case ta_remove_longcall
:
8365 /* These will be removed or converted before we get here. */
8372 memmove (scratch
, &contents
[orig_dot
], orig_insn_size
);
8373 BFD_ASSERT (action
->removed_bytes
== -1);
8374 rv
= widen_instruction (scratch
, final_size
, 0);
8376 memmove (&dup_contents
[dup_dot
], scratch
, copy_size
);
8377 orig_dot
+= orig_insn_size
;
8378 dup_dot
+= copy_size
;
8381 case ta_add_literal
:
8384 BFD_ASSERT (action
->removed_bytes
== -4);
8385 /* TBD -- place the literal value here and insert
8387 memset (&dup_contents
[dup_dot
], 0, 4);
8388 pin_internal_relocs (sec
, internal_relocs
);
8389 pin_contents (sec
, contents
);
8391 if (!move_literal (abfd
, link_info
, sec
, dup_dot
, dup_contents
,
8392 relax_info
, &internal_relocs
, &action
->value
))
8396 orig_dot_vo
+= copy_size
;
8398 orig_dot
+= orig_insn_size
;
8399 dup_dot
+= copy_size
;
8403 /* Not implemented yet. */
8408 size
-= action
->removed_bytes
;
8409 removed
+= action
->removed_bytes
;
8410 BFD_ASSERT (dup_dot
<= final_size
);
8411 BFD_ASSERT (orig_dot
<= orig_size
);
8414 orig_dot
+= orig_dot_copied
;
8415 orig_dot_copied
= 0;
8417 if (orig_dot
!= orig_size
)
8419 copy_size
= orig_size
- orig_dot
;
8420 BFD_ASSERT (orig_size
> orig_dot
);
8421 BFD_ASSERT (dup_dot
+ copy_size
== final_size
);
8422 memmove (&dup_contents
[dup_dot
], &contents
[orig_dot
], copy_size
);
8423 orig_dot
+= copy_size
;
8424 dup_dot
+= copy_size
;
8426 BFD_ASSERT (orig_size
== orig_dot
);
8427 BFD_ASSERT (final_size
== dup_dot
);
8429 /* Move the dup_contents back. */
8430 if (final_size
> orig_size
)
8432 /* Contents need to be reallocated. Swap the dup_contents into
8434 sec
->contents
= dup_contents
;
8436 contents
= dup_contents
;
8437 pin_contents (sec
, contents
);
8441 BFD_ASSERT (final_size
<= orig_size
);
8442 memset (contents
, 0, orig_size
);
8443 memcpy (contents
, dup_contents
, final_size
);
8444 free (dup_contents
);
8447 pin_contents (sec
, contents
);
8449 sec
->size
= final_size
;
8453 release_internal_relocs (sec
, internal_relocs
);
8454 release_contents (sec
, contents
);
8460 translate_section_fixes (asection
*sec
)
8462 xtensa_relax_info
*relax_info
;
8465 relax_info
= get_xtensa_relax_info (sec
);
8469 for (r
= relax_info
->fix_list
; r
!= NULL
; r
= r
->next
)
8470 if (!translate_reloc_bfd_fix (r
))
8477 /* Translate a fix given the mapping in the relax info for the target
8478 section. If it has already been translated, no work is required. */
8481 translate_reloc_bfd_fix (reloc_bfd_fix
*fix
)
8483 reloc_bfd_fix new_fix
;
8485 xtensa_relax_info
*relax_info
;
8486 removed_literal
*removed
;
8487 bfd_vma new_offset
, target_offset
;
8489 if (fix
->translated
)
8492 sec
= fix
->target_sec
;
8493 target_offset
= fix
->target_offset
;
8495 relax_info
= get_xtensa_relax_info (sec
);
8498 fix
->translated
= TRUE
;
8504 /* The fix does not need to be translated if the section cannot change. */
8505 if (!relax_info
->is_relaxable_literal_section
8506 && !relax_info
->is_relaxable_asm_section
)
8508 fix
->translated
= TRUE
;
8512 /* If the literal has been moved and this relocation was on an
8513 opcode, then the relocation should move to the new literal
8514 location. Otherwise, the relocation should move within the
8518 if (is_operand_relocation (fix
->src_type
))
8520 /* Check if the original relocation is against a literal being
8522 removed
= find_removed_literal (&relax_info
->removed_list
,
8530 /* The fact that there is still a relocation to this literal indicates
8531 that the literal is being coalesced, not simply removed. */
8532 BFD_ASSERT (removed
->to
.abfd
!= NULL
);
8534 /* This was moved to some other address (possibly another section). */
8535 new_sec
= r_reloc_get_section (&removed
->to
);
8539 relax_info
= get_xtensa_relax_info (sec
);
8541 (!relax_info
->is_relaxable_literal_section
8542 && !relax_info
->is_relaxable_asm_section
))
8544 target_offset
= removed
->to
.target_offset
;
8545 new_fix
.target_sec
= new_sec
;
8546 new_fix
.target_offset
= target_offset
;
8547 new_fix
.translated
= TRUE
;
8552 target_offset
= removed
->to
.target_offset
;
8553 new_fix
.target_sec
= new_sec
;
8556 /* The target address may have been moved within its section. */
8557 new_offset
= offset_with_removed_text (&relax_info
->action_list
,
8560 new_fix
.target_offset
= new_offset
;
8561 new_fix
.target_offset
= new_offset
;
8562 new_fix
.translated
= TRUE
;
8568 /* Fix up a relocation to take account of removed literals. */
8571 translate_reloc (const r_reloc
*orig_rel
, r_reloc
*new_rel
)
8574 xtensa_relax_info
*relax_info
;
8575 removed_literal
*removed
;
8576 bfd_vma new_offset
, target_offset
, removed_bytes
;
8578 *new_rel
= *orig_rel
;
8580 if (!r_reloc_is_defined (orig_rel
))
8582 sec
= r_reloc_get_section (orig_rel
);
8584 relax_info
= get_xtensa_relax_info (sec
);
8585 BFD_ASSERT (relax_info
);
8587 if (!relax_info
->is_relaxable_literal_section
8588 && !relax_info
->is_relaxable_asm_section
)
8591 target_offset
= orig_rel
->target_offset
;
8594 if (is_operand_relocation (ELF32_R_TYPE (orig_rel
->rela
.r_info
)))
8596 /* Check if the original relocation is against a literal being
8598 removed
= find_removed_literal (&relax_info
->removed_list
,
8601 if (removed
&& removed
->to
.abfd
)
8605 /* The fact that there is still a relocation to this literal indicates
8606 that the literal is being coalesced, not simply removed. */
8607 BFD_ASSERT (removed
->to
.abfd
!= NULL
);
8609 /* This was moved to some other address
8610 (possibly in another section). */
8611 *new_rel
= removed
->to
;
8612 new_sec
= r_reloc_get_section (new_rel
);
8616 relax_info
= get_xtensa_relax_info (sec
);
8618 || (!relax_info
->is_relaxable_literal_section
8619 && !relax_info
->is_relaxable_asm_section
))
8622 target_offset
= new_rel
->target_offset
;
8625 /* ...and the target address may have been moved within its section. */
8626 new_offset
= offset_with_removed_text (&relax_info
->action_list
,
8629 /* Modify the offset and addend. */
8630 removed_bytes
= target_offset
- new_offset
;
8631 new_rel
->target_offset
= new_offset
;
8632 new_rel
->rela
.r_addend
-= removed_bytes
;
8636 /* For dynamic links, there may be a dynamic relocation for each
8637 literal. The number of dynamic relocations must be computed in
8638 size_dynamic_sections, which occurs before relaxation. When a
8639 literal is removed, this function checks if there is a corresponding
8640 dynamic relocation and shrinks the size of the appropriate dynamic
8641 relocation section accordingly. At this point, the contents of the
8642 dynamic relocation sections have not yet been filled in, so there's
8643 nothing else that needs to be done. */
8646 shrink_dynamic_reloc_sections (struct bfd_link_info
*info
,
8648 asection
*input_section
,
8649 Elf_Internal_Rela
*rel
)
8651 struct elf_xtensa_link_hash_table
*htab
;
8652 Elf_Internal_Shdr
*symtab_hdr
;
8653 struct elf_link_hash_entry
**sym_hashes
;
8654 unsigned long r_symndx
;
8656 struct elf_link_hash_entry
*h
;
8657 bfd_boolean dynamic_symbol
;
8659 htab
= elf_xtensa_hash_table (info
);
8660 symtab_hdr
= &elf_tdata (abfd
)->symtab_hdr
;
8661 sym_hashes
= elf_sym_hashes (abfd
);
8663 r_type
= ELF32_R_TYPE (rel
->r_info
);
8664 r_symndx
= ELF32_R_SYM (rel
->r_info
);
8666 if (r_symndx
< symtab_hdr
->sh_info
)
8669 h
= sym_hashes
[r_symndx
- symtab_hdr
->sh_info
];
8671 dynamic_symbol
= elf_xtensa_dynamic_symbol_p (h
, info
);
8673 if ((r_type
== R_XTENSA_32
|| r_type
== R_XTENSA_PLT
)
8674 && (input_section
->flags
& SEC_ALLOC
) != 0
8675 && (dynamic_symbol
|| info
->shared
))
8678 bfd_boolean is_plt
= FALSE
;
8680 if (dynamic_symbol
&& r_type
== R_XTENSA_PLT
)
8682 srel
= htab
->srelplt
;
8686 srel
= htab
->srelgot
;
8688 /* Reduce size of the .rela.* section by one reloc. */
8689 BFD_ASSERT (srel
!= NULL
);
8690 BFD_ASSERT (srel
->size
>= sizeof (Elf32_External_Rela
));
8691 srel
->size
-= sizeof (Elf32_External_Rela
);
8695 asection
*splt
, *sgotplt
, *srelgot
;
8696 int reloc_index
, chunk
;
8698 /* Find the PLT reloc index of the entry being removed. This
8699 is computed from the size of ".rela.plt". It is needed to
8700 figure out which PLT chunk to resize. Usually "last index
8701 = size - 1" since the index starts at zero, but in this
8702 context, the size has just been decremented so there's no
8703 need to subtract one. */
8704 reloc_index
= srel
->size
/ sizeof (Elf32_External_Rela
);
8706 chunk
= reloc_index
/ PLT_ENTRIES_PER_CHUNK
;
8707 splt
= elf_xtensa_get_plt_section (info
, chunk
);
8708 sgotplt
= elf_xtensa_get_gotplt_section (info
, chunk
);
8709 BFD_ASSERT (splt
!= NULL
&& sgotplt
!= NULL
);
8711 /* Check if an entire PLT chunk has just been eliminated. */
8712 if (reloc_index
% PLT_ENTRIES_PER_CHUNK
== 0)
8714 /* The two magic GOT entries for that chunk can go away. */
8715 srelgot
= htab
->srelgot
;
8716 BFD_ASSERT (srelgot
!= NULL
);
8717 srelgot
->reloc_count
-= 2;
8718 srelgot
->size
-= 2 * sizeof (Elf32_External_Rela
);
8721 /* There should be only one entry left (and it will be
8723 BFD_ASSERT (sgotplt
->size
== 4);
8724 BFD_ASSERT (splt
->size
== PLT_ENTRY_SIZE
);
8727 BFD_ASSERT (sgotplt
->size
>= 4);
8728 BFD_ASSERT (splt
->size
>= PLT_ENTRY_SIZE
);
8731 splt
->size
-= PLT_ENTRY_SIZE
;
8737 /* Take an r_rel and move it to another section. This usually
8738 requires extending the interal_relocation array and pinning it. If
8739 the original r_rel is from the same BFD, we can complete this here.
8740 Otherwise, we add a fix record to let the final link fix the
8741 appropriate address. Contents and internal relocations for the
8742 section must be pinned after calling this routine. */
8745 move_literal (bfd
*abfd
,
8746 struct bfd_link_info
*link_info
,
8750 xtensa_relax_info
*relax_info
,
8751 Elf_Internal_Rela
**internal_relocs_p
,
8752 const literal_value
*lit
)
8754 Elf_Internal_Rela
*new_relocs
= NULL
;
8755 size_t new_relocs_count
= 0;
8756 Elf_Internal_Rela this_rela
;
8757 const r_reloc
*r_rel
;
8759 r_rel
= &lit
->r_rel
;
8760 BFD_ASSERT (elf_section_data (sec
)->relocs
== *internal_relocs_p
);
8762 if (r_reloc_is_const (r_rel
))
8763 bfd_put_32 (abfd
, lit
->value
, contents
+ offset
);
8768 asection
*target_sec
;
8772 r_type
= ELF32_R_TYPE (r_rel
->rela
.r_info
);
8773 target_sec
= r_reloc_get_section (r_rel
);
8775 /* This is the difficult case. We have to create a fix up. */
8776 this_rela
.r_offset
= offset
;
8777 this_rela
.r_info
= ELF32_R_INFO (0, r_type
);
8778 this_rela
.r_addend
=
8779 r_rel
->target_offset
- r_reloc_get_target_offset (r_rel
);
8780 bfd_put_32 (abfd
, lit
->value
, contents
+ offset
);
8782 /* Currently, we cannot move relocations during a relocatable link. */
8783 BFD_ASSERT (!link_info
->relocatable
);
8784 fix
= reloc_bfd_fix_init (sec
, offset
, r_type
,
8785 r_reloc_get_section (r_rel
),
8786 r_rel
->target_offset
+ r_rel
->virtual_offset
,
8788 /* We also need to mark that relocations are needed here. */
8789 sec
->flags
|= SEC_RELOC
;
8791 translate_reloc_bfd_fix (fix
);
8792 /* This fix has not yet been translated. */
8795 /* Add the relocation. If we have already allocated our own
8796 space for the relocations and we have room for more, then use
8797 it. Otherwise, allocate new space and move the literals. */
8798 insert_at
= sec
->reloc_count
;
8799 for (i
= 0; i
< sec
->reloc_count
; ++i
)
8801 if (this_rela
.r_offset
< (*internal_relocs_p
)[i
].r_offset
)
8808 if (*internal_relocs_p
!= relax_info
->allocated_relocs
8809 || sec
->reloc_count
+ 1 > relax_info
->allocated_relocs_count
)
8811 BFD_ASSERT (relax_info
->allocated_relocs
== NULL
8812 || sec
->reloc_count
== relax_info
->relocs_count
);
8814 if (relax_info
->allocated_relocs_count
== 0)
8815 new_relocs_count
= (sec
->reloc_count
+ 2) * 2;
8817 new_relocs_count
= (relax_info
->allocated_relocs_count
+ 2) * 2;
8819 new_relocs
= (Elf_Internal_Rela
*)
8820 bfd_zmalloc (sizeof (Elf_Internal_Rela
) * (new_relocs_count
));
8824 /* We could handle this more quickly by finding the split point. */
8826 memcpy (new_relocs
, *internal_relocs_p
,
8827 insert_at
* sizeof (Elf_Internal_Rela
));
8829 new_relocs
[insert_at
] = this_rela
;
8831 if (insert_at
!= sec
->reloc_count
)
8832 memcpy (new_relocs
+ insert_at
+ 1,
8833 (*internal_relocs_p
) + insert_at
,
8834 (sec
->reloc_count
- insert_at
)
8835 * sizeof (Elf_Internal_Rela
));
8837 if (*internal_relocs_p
!= relax_info
->allocated_relocs
)
8839 /* The first time we re-allocate, we can only free the
8840 old relocs if they were allocated with bfd_malloc.
8841 This is not true when keep_memory is in effect. */
8842 if (!link_info
->keep_memory
)
8843 free (*internal_relocs_p
);
8846 free (*internal_relocs_p
);
8847 relax_info
->allocated_relocs
= new_relocs
;
8848 relax_info
->allocated_relocs_count
= new_relocs_count
;
8849 elf_section_data (sec
)->relocs
= new_relocs
;
8851 relax_info
->relocs_count
= sec
->reloc_count
;
8852 *internal_relocs_p
= new_relocs
;
8856 if (insert_at
!= sec
->reloc_count
)
8859 for (idx
= sec
->reloc_count
; idx
> insert_at
; idx
--)
8860 (*internal_relocs_p
)[idx
] = (*internal_relocs_p
)[idx
-1];
8862 (*internal_relocs_p
)[insert_at
] = this_rela
;
8864 if (relax_info
->allocated_relocs
)
8865 relax_info
->relocs_count
= sec
->reloc_count
;
8872 /* This is similar to relax_section except that when a target is moved,
8873 we shift addresses up. We also need to modify the size. This
8874 algorithm does NOT allow for relocations into the middle of the
8875 property sections. */
8878 relax_property_section (bfd
*abfd
,
8880 struct bfd_link_info
*link_info
)
8882 Elf_Internal_Rela
*internal_relocs
;
8885 bfd_boolean ok
= TRUE
;
8886 bfd_boolean is_full_prop_section
;
8887 size_t last_zfill_target_offset
= 0;
8888 asection
*last_zfill_target_sec
= NULL
;
8889 bfd_size_type sec_size
;
8890 bfd_size_type entry_size
;
8892 sec_size
= bfd_get_section_limit (abfd
, sec
);
8893 internal_relocs
= retrieve_internal_relocs (abfd
, sec
,
8894 link_info
->keep_memory
);
8895 contents
= retrieve_contents (abfd
, sec
, link_info
->keep_memory
);
8896 if (contents
== NULL
&& sec_size
!= 0)
8902 is_full_prop_section
= xtensa_is_proptable_section (sec
);
8903 if (is_full_prop_section
)
8908 if (internal_relocs
)
8910 for (i
= 0; i
< sec
->reloc_count
; i
++)
8912 Elf_Internal_Rela
*irel
;
8913 xtensa_relax_info
*target_relax_info
;
8915 asection
*target_sec
;
8917 bfd_byte
*size_p
, *flags_p
;
8919 /* Locally change the source address.
8920 Translate the target to the new target address.
8921 If it points to this section and has been removed, MOVE IT.
8922 Also, don't forget to modify the associated SIZE at
8925 irel
= &internal_relocs
[i
];
8926 r_type
= ELF32_R_TYPE (irel
->r_info
);
8927 if (r_type
== R_XTENSA_NONE
)
8930 /* Find the literal value. */
8931 r_reloc_init (&val
.r_rel
, abfd
, irel
, contents
, sec_size
);
8932 size_p
= &contents
[irel
->r_offset
+ 4];
8934 if (is_full_prop_section
)
8935 flags_p
= &contents
[irel
->r_offset
+ 8];
8936 BFD_ASSERT (irel
->r_offset
+ entry_size
<= sec_size
);
8938 target_sec
= r_reloc_get_section (&val
.r_rel
);
8939 target_relax_info
= get_xtensa_relax_info (target_sec
);
8941 if (target_relax_info
8942 && (target_relax_info
->is_relaxable_literal_section
8943 || target_relax_info
->is_relaxable_asm_section
))
8945 /* Translate the relocation's destination. */
8946 bfd_vma new_offset
, new_end_offset
;
8947 long old_size
, new_size
;
8949 new_offset
= offset_with_removed_text
8950 (&target_relax_info
->action_list
, val
.r_rel
.target_offset
);
8952 /* Assert that we are not out of bounds. */
8953 old_size
= bfd_get_32 (abfd
, size_p
);
8957 /* Only the first zero-sized unreachable entry is
8958 allowed to expand. In this case the new offset
8959 should be the offset before the fill and the new
8960 size is the expansion size. For other zero-sized
8961 entries the resulting size should be zero with an
8962 offset before or after the fill address depending
8963 on whether the expanding unreachable entry
8965 if (last_zfill_target_sec
8966 && last_zfill_target_sec
== target_sec
8967 && last_zfill_target_offset
== val
.r_rel
.target_offset
)
8968 new_end_offset
= new_offset
;
8971 new_end_offset
= new_offset
;
8972 new_offset
= offset_with_removed_text_before_fill
8973 (&target_relax_info
->action_list
,
8974 val
.r_rel
.target_offset
);
8976 /* If it is not unreachable and we have not yet
8977 seen an unreachable at this address, place it
8978 before the fill address. */
8980 || (bfd_get_32 (abfd
, flags_p
)
8981 & XTENSA_PROP_UNREACHABLE
) == 0)
8982 new_end_offset
= new_offset
;
8985 last_zfill_target_sec
= target_sec
;
8986 last_zfill_target_offset
= val
.r_rel
.target_offset
;
8992 new_end_offset
= offset_with_removed_text_before_fill
8993 (&target_relax_info
->action_list
,
8994 val
.r_rel
.target_offset
+ old_size
);
8997 new_size
= new_end_offset
- new_offset
;
8999 if (new_size
!= old_size
)
9001 bfd_put_32 (abfd
, new_size
, size_p
);
9002 pin_contents (sec
, contents
);
9005 if (new_offset
!= val
.r_rel
.target_offset
)
9007 bfd_vma diff
= new_offset
- val
.r_rel
.target_offset
;
9008 irel
->r_addend
+= diff
;
9009 pin_internal_relocs (sec
, internal_relocs
);
9015 /* Combine adjacent property table entries. This is also done in
9016 finish_dynamic_sections() but at that point it's too late to
9017 reclaim the space in the output section, so we do this twice. */
9019 if (internal_relocs
&& (!link_info
->relocatable
9020 || xtensa_is_littable_section (sec
)))
9022 Elf_Internal_Rela
*last_irel
= NULL
;
9023 Elf_Internal_Rela
*irel
, *next_rel
, *rel_end
;
9024 int removed_bytes
= 0;
9026 bfd_vma section_size
;
9027 flagword predef_flags
;
9029 predef_flags
= xtensa_get_property_predef_flags (sec
);
9031 /* Walk over memory and relocations at the same time.
9032 This REQUIRES that the internal_relocs be sorted by offset. */
9033 qsort (internal_relocs
, sec
->reloc_count
, sizeof (Elf_Internal_Rela
),
9034 internal_reloc_compare
);
9036 pin_internal_relocs (sec
, internal_relocs
);
9037 pin_contents (sec
, contents
);
9039 next_rel
= internal_relocs
;
9040 rel_end
= internal_relocs
+ sec
->reloc_count
;
9042 section_size
= sec
->size
;
9043 BFD_ASSERT (section_size
% entry_size
== 0);
9045 for (offset
= 0; offset
< section_size
; offset
+= entry_size
)
9047 Elf_Internal_Rela
*offset_rel
, *extra_rel
;
9048 bfd_vma bytes_to_remove
, size
, actual_offset
;
9049 bfd_boolean remove_this_rel
;
9052 /* Find the first relocation for the entry at the current offset.
9053 Adjust the offsets of any extra relocations for the previous
9058 for (irel
= next_rel
; irel
< rel_end
; irel
++)
9060 if ((irel
->r_offset
== offset
9061 && ELF32_R_TYPE (irel
->r_info
) != R_XTENSA_NONE
)
9062 || irel
->r_offset
> offset
)
9067 irel
->r_offset
-= removed_bytes
;
9071 /* Find the next relocation (if there are any left). */
9075 for (irel
= offset_rel
+ 1; irel
< rel_end
; irel
++)
9077 if (ELF32_R_TYPE (irel
->r_info
) != R_XTENSA_NONE
)
9085 /* Check if there are relocations on the current entry. There
9086 should usually be a relocation on the offset field. If there
9087 are relocations on the size or flags, then we can't optimize
9088 this entry. Also, find the next relocation to examine on the
9092 if (offset_rel
->r_offset
>= offset
+ entry_size
)
9094 next_rel
= offset_rel
;
9095 /* There are no relocations on the current entry, but we
9096 might still be able to remove it if the size is zero. */
9099 else if (offset_rel
->r_offset
> offset
9101 && extra_rel
->r_offset
< offset
+ entry_size
))
9103 /* There is a relocation on the size or flags, so we can't
9104 do anything with this entry. Continue with the next. */
9105 next_rel
= offset_rel
;
9110 BFD_ASSERT (offset_rel
->r_offset
== offset
);
9111 offset_rel
->r_offset
-= removed_bytes
;
9112 next_rel
= offset_rel
+ 1;
9118 remove_this_rel
= FALSE
;
9119 bytes_to_remove
= 0;
9120 actual_offset
= offset
- removed_bytes
;
9121 size
= bfd_get_32 (abfd
, &contents
[actual_offset
+ 4]);
9123 if (is_full_prop_section
)
9124 flags
= bfd_get_32 (abfd
, &contents
[actual_offset
+ 8]);
9126 flags
= predef_flags
;
9129 && (flags
& XTENSA_PROP_ALIGN
) == 0
9130 && (flags
& XTENSA_PROP_UNREACHABLE
) == 0)
9132 /* Always remove entries with zero size and no alignment. */
9133 bytes_to_remove
= entry_size
;
9135 remove_this_rel
= TRUE
;
9138 && ELF32_R_TYPE (offset_rel
->r_info
) == R_XTENSA_32
)
9144 bfd_get_32 (abfd
, &contents
[last_irel
->r_offset
+ 4]);
9145 bfd_vma old_address
=
9146 (last_irel
->r_addend
9147 + bfd_get_32 (abfd
, &contents
[last_irel
->r_offset
]));
9148 bfd_vma new_address
=
9149 (offset_rel
->r_addend
9150 + bfd_get_32 (abfd
, &contents
[actual_offset
]));
9151 if (is_full_prop_section
)
9152 old_flags
= bfd_get_32
9153 (abfd
, &contents
[last_irel
->r_offset
+ 8]);
9155 old_flags
= predef_flags
;
9157 if ((ELF32_R_SYM (offset_rel
->r_info
)
9158 == ELF32_R_SYM (last_irel
->r_info
))
9159 && old_address
+ old_size
== new_address
9160 && old_flags
== flags
9161 && (old_flags
& XTENSA_PROP_INSN_BRANCH_TARGET
) == 0
9162 && (old_flags
& XTENSA_PROP_INSN_LOOP_TARGET
) == 0)
9164 /* Fix the old size. */
9165 bfd_put_32 (abfd
, old_size
+ size
,
9166 &contents
[last_irel
->r_offset
+ 4]);
9167 bytes_to_remove
= entry_size
;
9168 remove_this_rel
= TRUE
;
9171 last_irel
= offset_rel
;
9174 last_irel
= offset_rel
;
9177 if (remove_this_rel
)
9179 offset_rel
->r_info
= ELF32_R_INFO (0, R_XTENSA_NONE
);
9180 /* In case this is the last entry, move the relocation offset
9181 to the previous entry, if there is one. */
9182 if (offset_rel
->r_offset
>= bytes_to_remove
)
9183 offset_rel
->r_offset
-= bytes_to_remove
;
9185 offset_rel
->r_offset
= 0;
9188 if (bytes_to_remove
!= 0)
9190 removed_bytes
+= bytes_to_remove
;
9191 if (offset
+ bytes_to_remove
< section_size
)
9192 memmove (&contents
[actual_offset
],
9193 &contents
[actual_offset
+ bytes_to_remove
],
9194 section_size
- offset
- bytes_to_remove
);
9200 /* Fix up any extra relocations on the last entry. */
9201 for (irel
= next_rel
; irel
< rel_end
; irel
++)
9202 irel
->r_offset
-= removed_bytes
;
9204 /* Clear the removed bytes. */
9205 memset (&contents
[section_size
- removed_bytes
], 0, removed_bytes
);
9207 sec
->size
= section_size
- removed_bytes
;
9209 if (xtensa_is_littable_section (sec
))
9211 asection
*sgotloc
= elf_xtensa_hash_table (link_info
)->sgotloc
;
9213 sgotloc
->size
-= removed_bytes
;
9219 release_internal_relocs (sec
, internal_relocs
);
9220 release_contents (sec
, contents
);
9225 /* Third relaxation pass. */
9227 /* Change symbol values to account for removed literals. */
9230 relax_section_symbols (bfd
*abfd
, asection
*sec
)
9232 xtensa_relax_info
*relax_info
;
9233 unsigned int sec_shndx
;
9234 Elf_Internal_Shdr
*symtab_hdr
;
9235 Elf_Internal_Sym
*isymbuf
;
9236 unsigned i
, num_syms
, num_locals
;
9238 relax_info
= get_xtensa_relax_info (sec
);
9239 BFD_ASSERT (relax_info
);
9241 if (!relax_info
->is_relaxable_literal_section
9242 && !relax_info
->is_relaxable_asm_section
)
9245 sec_shndx
= _bfd_elf_section_from_bfd_section (abfd
, sec
);
9247 symtab_hdr
= &elf_tdata (abfd
)->symtab_hdr
;
9248 isymbuf
= retrieve_local_syms (abfd
);
9250 num_syms
= symtab_hdr
->sh_size
/ sizeof (Elf32_External_Sym
);
9251 num_locals
= symtab_hdr
->sh_info
;
9253 /* Adjust the local symbols defined in this section. */
9254 for (i
= 0; i
< num_locals
; i
++)
9256 Elf_Internal_Sym
*isym
= &isymbuf
[i
];
9258 if (isym
->st_shndx
== sec_shndx
)
9260 bfd_vma new_address
= offset_with_removed_text
9261 (&relax_info
->action_list
, isym
->st_value
);
9262 bfd_vma new_size
= isym
->st_size
;
9264 if (ELF32_ST_TYPE (isym
->st_info
) == STT_FUNC
)
9266 bfd_vma new_end
= offset_with_removed_text
9267 (&relax_info
->action_list
, isym
->st_value
+ isym
->st_size
);
9268 new_size
= new_end
- new_address
;
9271 isym
->st_value
= new_address
;
9272 isym
->st_size
= new_size
;
9276 /* Now adjust the global symbols defined in this section. */
9277 for (i
= 0; i
< (num_syms
- num_locals
); i
++)
9279 struct elf_link_hash_entry
*sym_hash
;
9281 sym_hash
= elf_sym_hashes (abfd
)[i
];
9283 if (sym_hash
->root
.type
== bfd_link_hash_warning
)
9284 sym_hash
= (struct elf_link_hash_entry
*) sym_hash
->root
.u
.i
.link
;
9286 if ((sym_hash
->root
.type
== bfd_link_hash_defined
9287 || sym_hash
->root
.type
== bfd_link_hash_defweak
)
9288 && sym_hash
->root
.u
.def
.section
== sec
)
9290 bfd_vma new_address
= offset_with_removed_text
9291 (&relax_info
->action_list
, sym_hash
->root
.u
.def
.value
);
9292 bfd_vma new_size
= sym_hash
->size
;
9294 if (sym_hash
->type
== STT_FUNC
)
9296 bfd_vma new_end
= offset_with_removed_text
9297 (&relax_info
->action_list
,
9298 sym_hash
->root
.u
.def
.value
+ sym_hash
->size
);
9299 new_size
= new_end
- new_address
;
9302 sym_hash
->root
.u
.def
.value
= new_address
;
9303 sym_hash
->size
= new_size
;
9311 /* "Fix" handling functions, called while performing relocations. */
9314 do_fix_for_relocatable_link (Elf_Internal_Rela
*rel
,
9316 asection
*input_section
,
9320 asection
*sec
, *old_sec
;
9322 int r_type
= ELF32_R_TYPE (rel
->r_info
);
9325 if (r_type
== R_XTENSA_NONE
)
9328 fix
= get_bfd_fix (input_section
, rel
->r_offset
, r_type
);
9332 r_reloc_init (&r_rel
, input_bfd
, rel
, contents
,
9333 bfd_get_section_limit (input_bfd
, input_section
));
9334 old_sec
= r_reloc_get_section (&r_rel
);
9335 old_offset
= r_rel
.target_offset
;
9337 if (!old_sec
|| !r_reloc_is_defined (&r_rel
))
9339 if (r_type
!= R_XTENSA_ASM_EXPAND
)
9341 (*_bfd_error_handler
)
9342 (_("%B(%A+0x%lx): unexpected fix for %s relocation"),
9343 input_bfd
, input_section
, rel
->r_offset
,
9344 elf_howto_table
[r_type
].name
);
9347 /* Leave it be. Resolution will happen in a later stage. */
9351 sec
= fix
->target_sec
;
9352 rel
->r_addend
+= ((sec
->output_offset
+ fix
->target_offset
)
9353 - (old_sec
->output_offset
+ old_offset
));
9360 do_fix_for_final_link (Elf_Internal_Rela
*rel
,
9362 asection
*input_section
,
9364 bfd_vma
*relocationp
)
9367 int r_type
= ELF32_R_TYPE (rel
->r_info
);
9371 if (r_type
== R_XTENSA_NONE
)
9374 fix
= get_bfd_fix (input_section
, rel
->r_offset
, r_type
);
9378 sec
= fix
->target_sec
;
9380 fixup_diff
= rel
->r_addend
;
9381 if (elf_howto_table
[fix
->src_type
].partial_inplace
)
9383 bfd_vma inplace_val
;
9384 BFD_ASSERT (fix
->src_offset
9385 < bfd_get_section_limit (input_bfd
, input_section
));
9386 inplace_val
= bfd_get_32 (input_bfd
, &contents
[fix
->src_offset
]);
9387 fixup_diff
+= inplace_val
;
9390 *relocationp
= (sec
->output_section
->vma
9391 + sec
->output_offset
9392 + fix
->target_offset
- fixup_diff
);
9396 /* Miscellaneous utility functions.... */
9399 elf_xtensa_get_plt_section (struct bfd_link_info
*info
, int chunk
)
9401 struct elf_xtensa_link_hash_table
*htab
;
9407 htab
= elf_xtensa_hash_table (info
);
9411 dynobj
= elf_hash_table (info
)->dynobj
;
9412 sprintf (plt_name
, ".plt.%u", chunk
);
9413 return bfd_get_section_by_name (dynobj
, plt_name
);
9418 elf_xtensa_get_gotplt_section (struct bfd_link_info
*info
, int chunk
)
9420 struct elf_xtensa_link_hash_table
*htab
;
9426 htab
= elf_xtensa_hash_table (info
);
9427 return htab
->sgotplt
;
9430 dynobj
= elf_hash_table (info
)->dynobj
;
9431 sprintf (got_name
, ".got.plt.%u", chunk
);
9432 return bfd_get_section_by_name (dynobj
, got_name
);
9436 /* Get the input section for a given symbol index.
9438 . a section symbol, return the section;
9439 . a common symbol, return the common section;
9440 . an undefined symbol, return the undefined section;
9441 . an indirect symbol, follow the links;
9442 . an absolute value, return the absolute section. */
9445 get_elf_r_symndx_section (bfd
*abfd
, unsigned long r_symndx
)
9447 Elf_Internal_Shdr
*symtab_hdr
= &elf_tdata (abfd
)->symtab_hdr
;
9448 asection
*target_sec
= NULL
;
9449 if (r_symndx
< symtab_hdr
->sh_info
)
9451 Elf_Internal_Sym
*isymbuf
;
9452 unsigned int section_index
;
9454 isymbuf
= retrieve_local_syms (abfd
);
9455 section_index
= isymbuf
[r_symndx
].st_shndx
;
9457 if (section_index
== SHN_UNDEF
)
9458 target_sec
= bfd_und_section_ptr
;
9459 else if (section_index
> 0 && section_index
< SHN_LORESERVE
)
9460 target_sec
= bfd_section_from_elf_index (abfd
, section_index
);
9461 else if (section_index
== SHN_ABS
)
9462 target_sec
= bfd_abs_section_ptr
;
9463 else if (section_index
== SHN_COMMON
)
9464 target_sec
= bfd_com_section_ptr
;
9471 unsigned long indx
= r_symndx
- symtab_hdr
->sh_info
;
9472 struct elf_link_hash_entry
*h
= elf_sym_hashes (abfd
)[indx
];
9474 while (h
->root
.type
== bfd_link_hash_indirect
9475 || h
->root
.type
== bfd_link_hash_warning
)
9476 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
9478 switch (h
->root
.type
)
9480 case bfd_link_hash_defined
:
9481 case bfd_link_hash_defweak
:
9482 target_sec
= h
->root
.u
.def
.section
;
9484 case bfd_link_hash_common
:
9485 target_sec
= bfd_com_section_ptr
;
9487 case bfd_link_hash_undefined
:
9488 case bfd_link_hash_undefweak
:
9489 target_sec
= bfd_und_section_ptr
;
9491 default: /* New indirect warning. */
9492 target_sec
= bfd_und_section_ptr
;
9500 static struct elf_link_hash_entry
*
9501 get_elf_r_symndx_hash_entry (bfd
*abfd
, unsigned long r_symndx
)
9504 struct elf_link_hash_entry
*h
;
9505 Elf_Internal_Shdr
*symtab_hdr
= &elf_tdata (abfd
)->symtab_hdr
;
9507 if (r_symndx
< symtab_hdr
->sh_info
)
9510 indx
= r_symndx
- symtab_hdr
->sh_info
;
9511 h
= elf_sym_hashes (abfd
)[indx
];
9512 while (h
->root
.type
== bfd_link_hash_indirect
9513 || h
->root
.type
== bfd_link_hash_warning
)
9514 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
9519 /* Get the section-relative offset for a symbol number. */
9522 get_elf_r_symndx_offset (bfd
*abfd
, unsigned long r_symndx
)
9524 Elf_Internal_Shdr
*symtab_hdr
= &elf_tdata (abfd
)->symtab_hdr
;
9527 if (r_symndx
< symtab_hdr
->sh_info
)
9529 Elf_Internal_Sym
*isymbuf
;
9530 isymbuf
= retrieve_local_syms (abfd
);
9531 offset
= isymbuf
[r_symndx
].st_value
;
9535 unsigned long indx
= r_symndx
- symtab_hdr
->sh_info
;
9536 struct elf_link_hash_entry
*h
=
9537 elf_sym_hashes (abfd
)[indx
];
9539 while (h
->root
.type
== bfd_link_hash_indirect
9540 || h
->root
.type
== bfd_link_hash_warning
)
9541 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
9542 if (h
->root
.type
== bfd_link_hash_defined
9543 || h
->root
.type
== bfd_link_hash_defweak
)
9544 offset
= h
->root
.u
.def
.value
;
9551 is_reloc_sym_weak (bfd
*abfd
, Elf_Internal_Rela
*rel
)
9553 unsigned long r_symndx
= ELF32_R_SYM (rel
->r_info
);
9554 struct elf_link_hash_entry
*h
;
9556 h
= get_elf_r_symndx_hash_entry (abfd
, r_symndx
);
9557 if (h
&& h
->root
.type
== bfd_link_hash_defweak
)
9564 pcrel_reloc_fits (xtensa_opcode opc
,
9566 bfd_vma self_address
,
9567 bfd_vma dest_address
)
9569 xtensa_isa isa
= xtensa_default_isa
;
9570 uint32 valp
= dest_address
;
9571 if (xtensa_operand_do_reloc (isa
, opc
, opnd
, &valp
, self_address
)
9572 || xtensa_operand_encode (isa
, opc
, opnd
, &valp
))
9579 xtensa_is_property_section (asection
*sec
)
9581 if (xtensa_is_insntable_section (sec
)
9582 || xtensa_is_littable_section (sec
)
9583 || xtensa_is_proptable_section (sec
))
9591 xtensa_is_insntable_section (asection
*sec
)
9593 if (CONST_STRNEQ (sec
->name
, XTENSA_INSN_SEC_NAME
)
9594 || CONST_STRNEQ (sec
->name
, ".gnu.linkonce.x."))
9602 xtensa_is_littable_section (asection
*sec
)
9604 if (CONST_STRNEQ (sec
->name
, XTENSA_LIT_SEC_NAME
)
9605 || CONST_STRNEQ (sec
->name
, ".gnu.linkonce.p."))
9613 xtensa_is_proptable_section (asection
*sec
)
9615 if (CONST_STRNEQ (sec
->name
, XTENSA_PROP_SEC_NAME
)
9616 || CONST_STRNEQ (sec
->name
, ".gnu.linkonce.prop."))
9624 internal_reloc_compare (const void *ap
, const void *bp
)
9626 const Elf_Internal_Rela
*a
= (const Elf_Internal_Rela
*) ap
;
9627 const Elf_Internal_Rela
*b
= (const Elf_Internal_Rela
*) bp
;
9629 if (a
->r_offset
!= b
->r_offset
)
9630 return (a
->r_offset
- b
->r_offset
);
9632 /* We don't need to sort on these criteria for correctness,
9633 but enforcing a more strict ordering prevents unstable qsort
9634 from behaving differently with different implementations.
9635 Without the code below we get correct but different results
9636 on Solaris 2.7 and 2.8. We would like to always produce the
9637 same results no matter the host. */
9639 if (a
->r_info
!= b
->r_info
)
9640 return (a
->r_info
- b
->r_info
);
9642 return (a
->r_addend
- b
->r_addend
);
9647 internal_reloc_matches (const void *ap
, const void *bp
)
9649 const Elf_Internal_Rela
*a
= (const Elf_Internal_Rela
*) ap
;
9650 const Elf_Internal_Rela
*b
= (const Elf_Internal_Rela
*) bp
;
9652 /* Check if one entry overlaps with the other; this shouldn't happen
9653 except when searching for a match. */
9654 return (a
->r_offset
- b
->r_offset
);
9658 /* Predicate function used to look up a section in a particular group. */
9661 match_section_group (bfd
*abfd ATTRIBUTE_UNUSED
, asection
*sec
, void *inf
)
9663 const char *gname
= inf
;
9664 const char *group_name
= elf_group_name (sec
);
9666 return (group_name
== gname
9667 || (group_name
!= NULL
9669 && strcmp (group_name
, gname
) == 0));
9673 static int linkonce_len
= sizeof (".gnu.linkonce.") - 1;
9676 xtensa_get_property_section (asection
*sec
, const char *base_name
)
9678 const char *suffix
, *group_name
;
9679 char *prop_sec_name
;
9682 group_name
= elf_group_name (sec
);
9685 suffix
= strrchr (sec
->name
, '.');
9686 if (suffix
== sec
->name
)
9688 prop_sec_name
= (char *) bfd_malloc (strlen (base_name
) + 1
9689 + (suffix
? strlen (suffix
) : 0));
9690 strcpy (prop_sec_name
, base_name
);
9692 strcat (prop_sec_name
, suffix
);
9694 else if (strncmp (sec
->name
, ".gnu.linkonce.", linkonce_len
) == 0)
9696 char *linkonce_kind
= 0;
9698 if (strcmp (base_name
, XTENSA_INSN_SEC_NAME
) == 0)
9699 linkonce_kind
= "x.";
9700 else if (strcmp (base_name
, XTENSA_LIT_SEC_NAME
) == 0)
9701 linkonce_kind
= "p.";
9702 else if (strcmp (base_name
, XTENSA_PROP_SEC_NAME
) == 0)
9703 linkonce_kind
= "prop.";
9707 prop_sec_name
= (char *) bfd_malloc (strlen (sec
->name
)
9708 + strlen (linkonce_kind
) + 1);
9709 memcpy (prop_sec_name
, ".gnu.linkonce.", linkonce_len
);
9710 strcpy (prop_sec_name
+ linkonce_len
, linkonce_kind
);
9712 suffix
= sec
->name
+ linkonce_len
;
9713 /* For backward compatibility, replace "t." instead of inserting
9714 the new linkonce_kind (but not for "prop" sections). */
9715 if (CONST_STRNEQ (suffix
, "t.") && linkonce_kind
[1] == '.')
9717 strcat (prop_sec_name
+ linkonce_len
, suffix
);
9720 prop_sec_name
= strdup (base_name
);
9722 /* Check if the section already exists. */
9723 prop_sec
= bfd_get_section_by_name_if (sec
->owner
, prop_sec_name
,
9724 match_section_group
,
9725 (void *) group_name
);
9726 /* If not, create it. */
9729 flagword flags
= (SEC_RELOC
| SEC_HAS_CONTENTS
| SEC_READONLY
);
9730 flags
|= (bfd_get_section_flags (sec
->owner
, sec
)
9731 & (SEC_LINK_ONCE
| SEC_LINK_DUPLICATES
));
9733 prop_sec
= bfd_make_section_anyway_with_flags
9734 (sec
->owner
, strdup (prop_sec_name
), flags
);
9738 elf_group_name (prop_sec
) = group_name
;
9741 free (prop_sec_name
);
9747 xtensa_get_property_predef_flags (asection
*sec
)
9749 if (xtensa_is_insntable_section (sec
))
9750 return (XTENSA_PROP_INSN
9751 | XTENSA_PROP_NO_TRANSFORM
9752 | XTENSA_PROP_INSN_NO_REORDER
);
9754 if (xtensa_is_littable_section (sec
))
9755 return (XTENSA_PROP_LITERAL
9756 | XTENSA_PROP_NO_TRANSFORM
9757 | XTENSA_PROP_INSN_NO_REORDER
);
9763 /* Other functions called directly by the linker. */
9766 xtensa_callback_required_dependence (bfd
*abfd
,
9768 struct bfd_link_info
*link_info
,
9769 deps_callback_t callback
,
9772 Elf_Internal_Rela
*internal_relocs
;
9775 bfd_boolean ok
= TRUE
;
9776 bfd_size_type sec_size
;
9778 sec_size
= bfd_get_section_limit (abfd
, sec
);
9780 /* ".plt*" sections have no explicit relocations but they contain L32R
9781 instructions that reference the corresponding ".got.plt*" sections. */
9782 if ((sec
->flags
& SEC_LINKER_CREATED
) != 0
9783 && CONST_STRNEQ (sec
->name
, ".plt"))
9787 /* Find the corresponding ".got.plt*" section. */
9788 if (sec
->name
[4] == '\0')
9789 sgotplt
= bfd_get_section_by_name (sec
->owner
, ".got.plt");
9795 BFD_ASSERT (sec
->name
[4] == '.');
9796 chunk
= strtol (&sec
->name
[5], NULL
, 10);
9798 sprintf (got_name
, ".got.plt.%u", chunk
);
9799 sgotplt
= bfd_get_section_by_name (sec
->owner
, got_name
);
9801 BFD_ASSERT (sgotplt
);
9803 /* Assume worst-case offsets: L32R at the very end of the ".plt"
9804 section referencing a literal at the very beginning of
9805 ".got.plt". This is very close to the real dependence, anyway. */
9806 (*callback
) (sec
, sec_size
, sgotplt
, 0, closure
);
9809 /* Only ELF files are supported for Xtensa. Check here to avoid a segfault
9810 when building uclibc, which runs "ld -b binary /dev/null". */
9811 if (bfd_get_flavour (abfd
) != bfd_target_elf_flavour
)
9814 internal_relocs
= retrieve_internal_relocs (abfd
, sec
,
9815 link_info
->keep_memory
);
9816 if (internal_relocs
== NULL
9817 || sec
->reloc_count
== 0)
9820 /* Cache the contents for the duration of this scan. */
9821 contents
= retrieve_contents (abfd
, sec
, link_info
->keep_memory
);
9822 if (contents
== NULL
&& sec_size
!= 0)
9828 if (!xtensa_default_isa
)
9829 xtensa_default_isa
= xtensa_isa_init (0, 0);
9831 for (i
= 0; i
< sec
->reloc_count
; i
++)
9833 Elf_Internal_Rela
*irel
= &internal_relocs
[i
];
9834 if (is_l32r_relocation (abfd
, sec
, contents
, irel
))
9837 asection
*target_sec
;
9838 bfd_vma target_offset
;
9840 r_reloc_init (&l32r_rel
, abfd
, irel
, contents
, sec_size
);
9843 /* L32Rs must be local to the input file. */
9844 if (r_reloc_is_defined (&l32r_rel
))
9846 target_sec
= r_reloc_get_section (&l32r_rel
);
9847 target_offset
= l32r_rel
.target_offset
;
9849 (*callback
) (sec
, irel
->r_offset
, target_sec
, target_offset
,
9855 release_internal_relocs (sec
, internal_relocs
);
9856 release_contents (sec
, contents
);
9860 /* The default literal sections should always be marked as "code" (i.e.,
9861 SHF_EXECINSTR). This is particularly important for the Linux kernel
9862 module loader so that the literals are not placed after the text. */
9863 static const struct bfd_elf_special_section elf_xtensa_special_sections
[] =
9865 { STRING_COMMA_LEN (".fini.literal"), 0, SHT_PROGBITS
, SHF_ALLOC
+ SHF_EXECINSTR
},
9866 { STRING_COMMA_LEN (".init.literal"), 0, SHT_PROGBITS
, SHF_ALLOC
+ SHF_EXECINSTR
},
9867 { STRING_COMMA_LEN (".literal"), 0, SHT_PROGBITS
, SHF_ALLOC
+ SHF_EXECINSTR
},
9868 { STRING_COMMA_LEN (".xtensa.info"), 0, SHT_NOTE
, 0 },
9869 { NULL
, 0, 0, 0, 0 }
9873 #define TARGET_LITTLE_SYM bfd_elf32_xtensa_le_vec
9874 #define TARGET_LITTLE_NAME "elf32-xtensa-le"
9875 #define TARGET_BIG_SYM bfd_elf32_xtensa_be_vec
9876 #define TARGET_BIG_NAME "elf32-xtensa-be"
9877 #define ELF_ARCH bfd_arch_xtensa
9879 #define ELF_MACHINE_CODE EM_XTENSA
9880 #define ELF_MACHINE_ALT1 EM_XTENSA_OLD
9883 #define ELF_MAXPAGESIZE (1 << XCHAL_MMU_MIN_PTE_PAGE_SIZE)
9884 #else /* !XCHAL_HAVE_MMU */
9885 #define ELF_MAXPAGESIZE 1
9886 #endif /* !XCHAL_HAVE_MMU */
9887 #endif /* ELF_ARCH */
9889 #define elf_backend_can_gc_sections 1
9890 #define elf_backend_can_refcount 1
9891 #define elf_backend_plt_readonly 1
9892 #define elf_backend_got_header_size 4
9893 #define elf_backend_want_dynbss 0
9894 #define elf_backend_want_got_plt 1
9896 #define elf_info_to_howto elf_xtensa_info_to_howto_rela
9898 #define bfd_elf32_bfd_merge_private_bfd_data elf_xtensa_merge_private_bfd_data
9899 #define bfd_elf32_new_section_hook elf_xtensa_new_section_hook
9900 #define bfd_elf32_bfd_print_private_bfd_data elf_xtensa_print_private_bfd_data
9901 #define bfd_elf32_bfd_relax_section elf_xtensa_relax_section
9902 #define bfd_elf32_bfd_reloc_type_lookup elf_xtensa_reloc_type_lookup
9903 #define bfd_elf32_bfd_reloc_name_lookup \
9904 elf_xtensa_reloc_name_lookup
9905 #define bfd_elf32_bfd_set_private_flags elf_xtensa_set_private_flags
9906 #define bfd_elf32_bfd_link_hash_table_create elf_xtensa_link_hash_table_create
9908 #define elf_backend_adjust_dynamic_symbol elf_xtensa_adjust_dynamic_symbol
9909 #define elf_backend_check_relocs elf_xtensa_check_relocs
9910 #define elf_backend_create_dynamic_sections elf_xtensa_create_dynamic_sections
9911 #define elf_backend_discard_info elf_xtensa_discard_info
9912 #define elf_backend_ignore_discarded_relocs elf_xtensa_ignore_discarded_relocs
9913 #define elf_backend_final_write_processing elf_xtensa_final_write_processing
9914 #define elf_backend_finish_dynamic_sections elf_xtensa_finish_dynamic_sections
9915 #define elf_backend_finish_dynamic_symbol elf_xtensa_finish_dynamic_symbol
9916 #define elf_backend_gc_mark_hook elf_xtensa_gc_mark_hook
9917 #define elf_backend_gc_sweep_hook elf_xtensa_gc_sweep_hook
9918 #define elf_backend_grok_prstatus elf_xtensa_grok_prstatus
9919 #define elf_backend_grok_psinfo elf_xtensa_grok_psinfo
9920 #define elf_backend_hide_symbol elf_xtensa_hide_symbol
9921 #define elf_backend_object_p elf_xtensa_object_p
9922 #define elf_backend_reloc_type_class elf_xtensa_reloc_type_class
9923 #define elf_backend_relocate_section elf_xtensa_relocate_section
9924 #define elf_backend_size_dynamic_sections elf_xtensa_size_dynamic_sections
9925 #define elf_backend_omit_section_dynsym \
9926 ((bfd_boolean (*) (bfd *, struct bfd_link_info *, asection *)) bfd_true)
9927 #define elf_backend_special_sections elf_xtensa_special_sections
9928 #define elf_backend_action_discarded elf_xtensa_action_discarded
9930 #include "elf32-target.h"