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1 | /* BFD backend for CRIS a.out binaries. | |
2 | Copyright (C) 2000-2020 Free Software Foundation, Inc. | |
3 | Contributed by Axis Communications AB. | |
4 | Written by Hans-Peter Nilsson. | |
5 | ||
6 | This file is part of BFD, the Binary File Descriptor library. | |
7 | ||
8 | This program is free software; you can redistribute it and/or modify | |
9 | it under the terms of the GNU General Public License as published by | |
10 | the Free Software Foundation; either version 3 of the License, or | |
11 | (at your option) any later version. | |
12 | ||
13 | This program is distributed in the hope that it will be useful, | |
14 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | GNU General Public License for more details. | |
17 | ||
18 | You should have received a copy of the GNU General Public License | |
19 | along with this program; if not, write to the Free Software | |
20 | Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, | |
21 | MA 02110-1301, USA. */ | |
22 | ||
23 | /* See info in the file PORTING for documentation of these macros and | |
24 | functions. Beware; some of the information there is outdated. */ | |
25 | ||
26 | #define N_HEADER_IN_TEXT(x) 0 | |
27 | #define N_TXTOFF(x) 32 | |
28 | #define ENTRY_CAN_BE_ZERO | |
29 | #define TEXT_START_ADDR 0 | |
30 | ||
31 | /* Without reading symbols to get the text start symbol, there is no way | |
32 | to know where the text segment starts in an a.out file. Defaulting to | |
33 | anything as constant as TEXT_START_ADDR is bad. But we can guess from | |
34 | the entry point, which is usually within the first 64k of the text | |
35 | segment. We also assume here that the text segment is 64k-aligned. | |
36 | FIXME: It is also wrong to assume that data and bss follow immediately | |
37 | after text, but with those, we don't have any choice besides reading | |
38 | symbol info, and luckily there's no pressing need for correctness for | |
39 | those vma:s at this time. */ | |
40 | #define N_TXTADDR(x) ((x)->a_entry & ~(bfd_vma) 0xffff) | |
41 | ||
42 | /* If you change this to 4, you can not link to an address N*4+2. */ | |
43 | #define SEGMENT_SIZE 2 | |
44 | ||
45 | /* For some reason, if the a.out file has Z_MAGIC, then | |
46 | adata(abfd).exec_bytes_size is not used, but rather | |
47 | adata(abfd).zmagic_disk_block_size, even though the exec_header is | |
48 | *not* included in the text segment. A simple workaround is to | |
49 | #define ZMAGIC_DISK_BLOCK_SIZE, which is used if defined; otherwise | |
50 | TARGET_PAGE_SIZE is used. */ | |
51 | #define ZMAGIC_DISK_BLOCK_SIZE N_TXTOFF (0) | |
52 | ||
53 | /* It seems odd at first to set a page-size this low, but gives greater | |
54 | freedom in where things can be linked. The drawback is that you have | |
55 | to set alignment and padding in linker scripts. */ | |
56 | #define TARGET_PAGE_SIZE SEGMENT_SIZE | |
57 | #define TARGETNAME "a.out-cris" | |
58 | ||
59 | /* Do not "beautify" the CONCAT* macro args. Traditional C will not | |
60 | remove whitespace added here, and thus will fail to concatenate | |
61 | the tokens. */ | |
62 | #define MY(OP) CONCAT2 (cris_aout_,OP) | |
63 | #define NAME(x, y) CONCAT3 (cris_aout,_32_,y) | |
64 | ||
65 | #include "sysdep.h" | |
66 | #include "bfd.h" | |
67 | ||
68 | /* Version 1 of the header. */ | |
69 | #define MY_exec_hdr_flags 1 | |
70 | ||
71 | #define MY_write_object_contents MY (write_object_contents) | |
72 | static bfd_boolean MY (write_object_contents) (bfd *); | |
73 | ||
74 | /* Forward this, so we can use a pointer to it in PARAMS. */ | |
75 | struct reloc_ext_external; | |
76 | ||
77 | #define MY_swap_ext_reloc_out MY (swap_ext_reloc_out) | |
78 | static void MY (swap_ext_reloc_out) (bfd *, arelent *, struct reloc_ext_external *); | |
79 | ||
80 | #define MY_swap_ext_reloc_in MY (swap_ext_reloc_in) | |
81 | static void MY (swap_ext_reloc_in) (bfd *, struct reloc_ext_external *, | |
82 | arelent *, asymbol **, bfd_size_type); | |
83 | ||
84 | #define MY_set_sizes MY (set_sizes) | |
85 | static bfd_boolean MY (set_sizes) (bfd *); | |
86 | ||
87 | /* To set back reloc_size to ext, we make MY (set_sizes) be called | |
88 | through this construct. Note that MY_set_arch_mach is only called | |
89 | through SET_ARCH_MACH. The default bfd_default_set_arch_mach will | |
90 | not call set_sizes. */ | |
91 | ||
92 | #define SET_ARCH_MACH(BFD, EXECP) \ | |
93 | bfd_set_arch_mach (BFD, bfd_arch_cris, N_MACHTYPE (EXECP)) | |
94 | ||
95 | /* These macros describe the binary layout of the reloc information we | |
96 | use in a file. */ | |
97 | #define RELOC_EXT_BITS_EXTERN_LITTLE 0x80 | |
98 | #define RELOC_EXT_BITS_TYPE_LITTLE 3 | |
99 | #define RELOC_EXT_BITS_TYPE_SH_LITTLE 0 | |
100 | ||
101 | #ifndef MY_get_section_contents | |
102 | #define MY_get_section_contents aout_32_get_section_contents | |
103 | #endif | |
104 | ||
105 | #define MACHTYPE_OK(mtype) ((mtype) == M_CRIS) | |
106 | ||
107 | /* Include generic functions (some are overridden above). */ | |
108 | #include "aout32.c" | |
109 | #include "aout-target.h" | |
110 | ||
111 | /* We need our own version to set header flags. */ | |
112 | ||
113 | static bfd_boolean | |
114 | MY (write_object_contents) (bfd *abfd) | |
115 | { | |
116 | struct external_exec exec_bytes; | |
117 | struct internal_exec *execp = exec_hdr (abfd); | |
118 | ||
119 | /* We set the reloc type to RELOC_EXT_SIZE, although setting it at all | |
120 | seems unnecessary when inspecting as and ld behavior (not an | |
121 | exhaustive inspection). The default write_object_contents | |
122 | definition sets RELOC_EXT_SIZE, so we follow suite and set it too. */ | |
123 | obj_reloc_entry_size (abfd) = RELOC_EXT_SIZE; | |
124 | ||
125 | /* Setting N_SET_MACHTYPE and using N_SET_FLAGS is not performed by | |
126 | the default definition. */ | |
127 | if (bfd_get_arch (abfd) == bfd_arch_cris) | |
128 | N_SET_MACHTYPE (execp, M_CRIS); | |
129 | ||
130 | N_SET_FLAGS (execp, aout_backend_info (abfd)->exec_hdr_flags); | |
131 | ||
132 | WRITE_HEADERS (abfd, execp); | |
133 | ||
134 | return TRUE; | |
135 | } | |
136 | ||
137 | /* We need our own for these reasons: | |
138 | - Assert that a normal 8, 16 or 32 reloc is output. | |
139 | - Fix what seems to be a weak-bug (perhaps there for valid reasons). */ | |
140 | ||
141 | static void | |
142 | MY (swap_ext_reloc_out) (bfd *abfd, | |
143 | arelent *g, | |
144 | struct reloc_ext_external *natptr) | |
145 | { | |
146 | int r_index; | |
147 | int r_extern; | |
148 | unsigned int r_type; | |
149 | bfd_vma r_addend; | |
150 | asymbol *sym = *(g->sym_ptr_ptr); | |
151 | asection *output_section = sym->section->output_section; | |
152 | ||
153 | PUT_WORD (abfd, g->address, natptr->r_address); | |
154 | ||
155 | r_type = (unsigned int) g->howto->type; | |
156 | ||
157 | r_addend = g->addend; | |
158 | if ((sym->flags & BSF_SECTION_SYM) != 0) | |
159 | r_addend += (*(g->sym_ptr_ptr))->section->output_section->vma; | |
160 | ||
161 | /* If this relocation is relative to a symbol then set the | |
162 | r_index to the symbols index, and the r_extern bit. | |
163 | ||
164 | Absolute symbols can come in in two ways, either as an offset | |
165 | from the abs section, or as a symbol which has an abs value. | |
166 | check for that here. */ | |
167 | ||
168 | if (bfd_is_abs_section (bfd_asymbol_section (sym))) | |
169 | { | |
170 | r_extern = 0; | |
171 | r_index = N_ABS; | |
172 | } | |
173 | else if ((sym->flags & BSF_SECTION_SYM) == 0) | |
174 | { | |
175 | if (bfd_is_und_section (bfd_asymbol_section (sym)) | |
176 | /* Remember to check for weak symbols; they count as global. */ | |
177 | || (sym->flags & (BSF_GLOBAL | BSF_WEAK)) != 0) | |
178 | r_extern = 1; | |
179 | else | |
180 | r_extern = 0; | |
181 | r_index = (*(g->sym_ptr_ptr))->KEEPIT; | |
182 | } | |
183 | else | |
184 | { | |
185 | /* Just an ordinary section. */ | |
186 | r_extern = 0; | |
187 | r_index = output_section->target_index; | |
188 | } | |
189 | ||
190 | /* The relocation type is the same as the canonical ones, but only | |
191 | the first 3 are used: RELOC_8, RELOC_16, RELOC_32. | |
192 | We may change this later, but assert this for the moment. */ | |
193 | if (r_type > 2) | |
194 | { | |
195 | /* xgettext:c-format */ | |
196 | _bfd_error_handler (_("%pB: unsupported relocation type exported: %#x"), | |
197 | abfd, r_type); | |
198 | ||
199 | bfd_set_error (bfd_error_wrong_format); | |
200 | } | |
201 | ||
202 | /* Now the fun stuff. */ | |
203 | natptr->r_index[2] = r_index >> 16; | |
204 | natptr->r_index[1] = r_index >> 8; | |
205 | natptr->r_index[0] = r_index; | |
206 | natptr->r_type[0] = | |
207 | (r_extern ? RELOC_EXT_BITS_EXTERN_LITTLE : 0) | |
208 | | (r_type << RELOC_EXT_BITS_TYPE_SH_LITTLE); | |
209 | ||
210 | PUT_WORD (abfd, r_addend, natptr->r_addend); | |
211 | } | |
212 | ||
213 | /* We need our own to assert that a normal 8, 16 or 32 reloc is input. */ | |
214 | ||
215 | static void | |
216 | MY (swap_ext_reloc_in) (bfd *abfd, | |
217 | struct reloc_ext_external *bytes, | |
218 | arelent *cache_ptr, | |
219 | asymbol **symbols, | |
220 | bfd_size_type symcount) | |
221 | { | |
222 | unsigned int r_index; | |
223 | int r_extern; | |
224 | unsigned int r_type; | |
225 | struct aoutdata *su = &(abfd->tdata.aout_data->a); | |
226 | ||
227 | cache_ptr->address = (GET_SWORD (abfd, bytes->r_address)); | |
228 | ||
229 | /* Now the fun stuff. */ | |
230 | r_index = (((unsigned int) bytes->r_index[2] << 16) | |
231 | | ((unsigned int) bytes->r_index[1] << 8) | |
232 | | bytes->r_index[0]); | |
233 | ||
234 | r_extern = (0 != (bytes->r_type[0] & RELOC_EXT_BITS_EXTERN_LITTLE)); | |
235 | ||
236 | r_type = ((bytes->r_type[0] & RELOC_EXT_BITS_TYPE_LITTLE) | |
237 | >> RELOC_EXT_BITS_TYPE_SH_LITTLE); | |
238 | ||
239 | if (r_type > 2) | |
240 | { | |
241 | /* xgettext:c-format */ | |
242 | _bfd_error_handler (_("%pB: unsupported relocation type imported: %#x"), | |
243 | abfd, r_type); | |
244 | ||
245 | bfd_set_error (bfd_error_wrong_format); | |
246 | } | |
247 | ||
248 | cache_ptr->howto = howto_table_ext + r_type; | |
249 | ||
250 | if (r_extern && r_index > symcount) | |
251 | { | |
252 | _bfd_error_handler | |
253 | /* xgettext:c-format */ | |
254 | (_("%pB: bad relocation record imported: %d"), abfd, r_index); | |
255 | ||
256 | bfd_set_error (bfd_error_wrong_format); | |
257 | ||
258 | /* We continue, so we can catch further errors. */ | |
259 | r_extern = 0; | |
260 | r_index = N_ABS; | |
261 | } | |
262 | ||
263 | /* Magically uses r_extern, symbols etc. Ugly, but it's what's in the | |
264 | default. */ | |
265 | MOVE_ADDRESS (GET_SWORD (abfd, bytes->r_addend)); | |
266 | } | |
267 | ||
268 | /* We use the same as the default, except that we also set | |
269 | "obj_reloc_entry_size (abfd) = RELOC_EXT_SIZE;", to avoid changing | |
270 | NAME (aout, set_arch_mach) in aoutx. */ | |
271 | ||
272 | static bfd_boolean | |
273 | MY (set_sizes) (bfd *abfd) | |
274 | { | |
275 | /* Just as the default in aout-target.h (with some #ifdefs folded)... */ | |
276 | ||
277 | adata (abfd).page_size = TARGET_PAGE_SIZE; | |
278 | adata (abfd).segment_size = SEGMENT_SIZE; | |
279 | adata (abfd).zmagic_disk_block_size = ZMAGIC_DISK_BLOCK_SIZE; | |
280 | adata (abfd).exec_bytes_size = EXEC_BYTES_SIZE; | |
281 | ||
282 | /* ... except for that we have the extended reloc. The alternative | |
283 | would be to add a check on bfd_arch_cris in NAME (aout, | |
284 | set_arch_mach) in aoutx.h, but I don't want to do that since | |
285 | target-specific things should not be added there. */ | |
286 | ||
287 | obj_reloc_entry_size (abfd) = RELOC_EXT_SIZE; | |
288 | ||
289 | return TRUE; | |
290 | } |