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1 /* ECOFF object file format.
2 Copyright (C) 1993-2021 Free Software Foundation, Inc.
3 Contributed by Cygnus Support.
4 This file was put together by Ian Lance Taylor <ian@cygnus.com>.
5
6 This file is part of GAS.
7
8 GAS 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, or (at your option)
11 any later version.
12
13 GAS 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 GAS; see the file COPYING. If not, write to the Free
20 Software Foundation, 51 Franklin Street - Fifth Floor, Boston, MA
21 02110-1301, USA. */
22
23 #define OBJ_HEADER "obj-ecoff.h"
24 #include "as.h"
25 #include "coff/internal.h"
26 #include "bfd/libcoff.h"
27 #include "bfd/libecoff.h"
28 #include "bfd/ecoff-bfd.h"
29
30 /* Almost all of the ECOFF support is actually in ecoff.c in the main
31 gas directory. This file mostly just arranges to call that one at
32 the right times. */
33
34 /* Set section VMAs and GP values before reloc processing. */
35
36 void
37 ecoff_frob_file_before_fix (void)
38 {
39 bfd_vma addr;
40 asection *sec;
41
42 /* Set the section VMA values. We force the .sdata and .sbss
43 sections to the end to ensure that their VMA addresses are close
44 together so that the GP register can address both of them. We
45 put the .bss section after the .sbss section.
46
47 Also, for the Alpha, we must sort the sections, to make sure they
48 appear in the output file in the correct order. (Actually, maybe
49 this is a job for BFD. But the VMAs computed would be out of
50 whack if we computed them given our initial, random ordering.
51 It's possible that that wouldn't break things; I could do some
52 experimenting sometime and find out.
53
54 This output ordering of sections is magic, on the Alpha, at
55 least. The .lita section must come before .lit8 and .lit4,
56 otherwise the OSF/1 linker may silently trash the .lit{4,8}
57 section contents. Also, .text must precede .rdata. These differ
58 from the order described in some parts of the DEC OSF/1 Assembly
59 Language Programmer's Guide, but that order doesn't seem to work
60 with their linker.
61
62 I don't know if section ordering on the MIPS is important. */
63
64 static const char *const names[] =
65 {
66 /* text segment */
67 ".text", ".rdata", ".init", ".fini",
68 /* data segment */
69 ".data", ".lita", ".lit8", ".lit4", ".sdata", ".got",
70 /* bss segment */
71 ".sbss", ".bss",
72 };
73 #define n_names ((int) (sizeof (names) / sizeof (names[0])))
74
75 /* Sections that match names, order to be straightened out later. */
76 asection *secs[n_names];
77 int i;
78
79 addr = 0;
80 for (i = 0; i < n_names; i++)
81 secs[i] = NULL;
82
83 for (sec = stdoutput->sections; sec != NULL; sec = sec->next)
84 {
85 for (i = 0; i < n_names; i++)
86 if (!strcmp (sec->name, names[i]))
87 {
88 secs[i] = sec;
89 bfd_section_list_remove (stdoutput, sec);
90 break;
91 }
92 if (i == n_names)
93 {
94 bfd_set_section_vma (sec, addr);
95 addr += bfd_section_size (sec);
96 }
97 }
98 for (i = 0; i < n_names; i++)
99 if (secs[i])
100 {
101 bfd_set_section_vma (secs[i], addr);
102 addr += bfd_section_size (secs[i]);
103 }
104 for (i = n_names - 1; i >= 0; i--)
105 if (secs[i])
106 bfd_section_list_prepend (stdoutput, secs[i]);
107
108 /* Fill in the register masks. */
109 {
110 unsigned long gprmask = 0;
111 unsigned long fprmask = 0;
112 unsigned long *cprmask = NULL;
113
114 #ifdef TC_MIPS
115 /* Fill in the MIPS register masks. It's probably not worth
116 setting up a generic interface for this. */
117 gprmask = mips_gprmask;
118 cprmask = mips_cprmask;
119 #endif
120
121 #ifdef TC_ALPHA
122 alpha_frob_ecoff_data ();
123
124 if (! bfd_ecoff_set_gp_value (stdoutput, alpha_gp_value))
125 as_fatal (_("Can't set GP value"));
126
127 gprmask = alpha_gprmask;
128 fprmask = alpha_fprmask;
129 #endif
130
131 if (! bfd_ecoff_set_regmasks (stdoutput, gprmask, fprmask, cprmask))
132 as_fatal (_("Can't set register masks"));
133 }
134 }
135
136 /* Swap out the symbols and debugging information for BFD. */
137
138 void
139 ecoff_frob_file (void)
140 {
141 const struct ecoff_debug_swap * const debug_swap
142 = &ecoff_backend (stdoutput)->debug_swap;
143 bfd_vma addr ATTRIBUTE_UNUSED;
144 HDRR *hdr;
145 char *buf;
146 char *set;
147
148 /* Build the ECOFF debugging information. */
149 gas_assert (ecoff_data (stdoutput) != 0);
150 hdr = &ecoff_data (stdoutput)->debug_info.symbolic_header;
151 ecoff_build_debug (hdr, &buf, debug_swap);
152
153 /* Finish up the ecoff_tdata structure. */
154 set = buf;
155 #define SET(ptr, count, type, size) \
156 if (hdr->count == 0) \
157 ecoff_data (stdoutput)->debug_info.ptr = NULL; \
158 else \
159 { \
160 ecoff_data (stdoutput)->debug_info.ptr = (type) set; \
161 set += hdr->count * size; \
162 }
163
164 SET (line, cbLine, unsigned char *, sizeof (unsigned char));
165 SET (external_dnr, idnMax, void *, debug_swap->external_dnr_size);
166 SET (external_pdr, ipdMax, void *, debug_swap->external_pdr_size);
167 SET (external_sym, isymMax, void *, debug_swap->external_sym_size);
168 SET (external_opt, ioptMax, void *, debug_swap->external_opt_size);
169 SET (external_aux, iauxMax, union aux_ext *, sizeof (union aux_ext));
170 SET (ss, issMax, char *, sizeof (char));
171 SET (ssext, issExtMax, char *, sizeof (char));
172 SET (external_rfd, crfd, void *, debug_swap->external_rfd_size);
173 SET (external_fdr, ifdMax, void *, debug_swap->external_fdr_size);
174 SET (external_ext, iextMax, void *, debug_swap->external_ext_size);
175 #undef SET
176 }
177
178 /* This is called by the ECOFF code to set the external information
179 for a symbol. We just pass it on to BFD, which expects the swapped
180 information to be stored in the native field of the symbol. */
181
182 void
183 obj_ecoff_set_ext (symbolS *sym, EXTR *ext)
184 {
185 const struct ecoff_debug_swap * const debug_swap
186 = &ecoff_backend (stdoutput)->debug_swap;
187 ecoff_symbol_type *esym;
188
189 know (bfd_asymbol_flavour (symbol_get_bfdsym (sym))
190 == bfd_target_ecoff_flavour);
191 esym = ecoffsymbol (symbol_get_bfdsym (sym));
192 esym->local = FALSE;
193 esym->native = xmalloc (debug_swap->external_ext_size);
194 (*debug_swap->swap_ext_out) (stdoutput, ext, esym->native);
195 }
196
197 static int
198 ecoff_sec_sym_ok_for_reloc (asection *sec ATTRIBUTE_UNUSED)
199 {
200 return 1;
201 }
202
203 static void
204 obj_ecoff_frob_symbol (symbolS *sym, int *puntp ATTRIBUTE_UNUSED)
205 {
206 ecoff_frob_symbol (sym);
207 }
208
209 static void
210 ecoff_pop_insert (void)
211 {
212 pop_insert (obj_pseudo_table);
213 }
214
215 static int
216 ecoff_separate_stab_sections (void)
217 {
218 return 0;
219 }
220
221 /* These are the pseudo-ops we support in this file. Only those
222 relating to debugging information are supported here.
223
224 The following pseudo-ops from the Kane and Heinrich MIPS book
225 should be defined here, but are currently unsupported: .bgnb,
226 .endb, .verstamp, .vreg.
227
228 The following pseudo-ops from the Kane and Heinrich MIPS book are
229 MIPS CPU specific, and should be defined by tc-mips.c: .alias,
230 .extern, .galive, .gjaldef, .gjrlive, .livereg, .noalias, .option,
231 .rdata, .sdata, .set.
232
233 The following pseudo-ops from the Kane and Heinrich MIPS book are
234 not MIPS CPU specific, but are also not ECOFF specific. I have
235 only listed the ones which are not already in read.c. It's not
236 completely clear where these should be defined, but tc-mips.c is
237 probably the most reasonable place: .asciiz, .asm0, .endr, .err,
238 .half, .lab, .repeat, .struct, .weakext. */
239
240 const pseudo_typeS obj_pseudo_table[] =
241 {
242 /* COFF style debugging information. .ln is not used; .loc is used
243 instead. */
244 { "def", ecoff_directive_def, 0 },
245 { "dim", ecoff_directive_dim, 0 },
246 { "endef", ecoff_directive_endef, 0 },
247 { "file", ecoff_directive_file, 0 },
248 { "scl", ecoff_directive_scl, 0 },
249 { "size", ecoff_directive_size, 0 },
250 { "esize", ecoff_directive_size, 0 },
251 { "tag", ecoff_directive_tag, 0 },
252 { "type", ecoff_directive_type, 0 },
253 { "etype", ecoff_directive_type, 0 },
254 { "val", ecoff_directive_val, 0 },
255
256 /* ECOFF specific debugging information. */
257 { "aent", ecoff_directive_ent, 1 },
258 { "begin", ecoff_directive_begin, 0 },
259 { "bend", ecoff_directive_bend, 0 },
260 { "end", ecoff_directive_end, 0 },
261 { "ent", ecoff_directive_ent, 0 },
262 { "fmask", ecoff_directive_fmask, 0 },
263 { "frame", ecoff_directive_frame, 0 },
264 { "loc", ecoff_directive_loc, 0 },
265 { "mask", ecoff_directive_mask, 0 },
266
267 /* Other ECOFF directives. */
268 { "extern", ecoff_directive_extern, 0 },
269
270 #ifndef TC_MIPS
271 /* For TC_MIPS, tc-mips.c adds this. */
272 { "weakext", ecoff_directive_weakext, 0 },
273 #endif
274
275 /* These are used on Irix. I don't know how to implement them. */
276 { "bgnb", s_ignore, 0 },
277 { "endb", s_ignore, 0 },
278 { "verstamp", s_ignore, 0 },
279
280 /* Sentinel. */
281 { NULL, s_ignore, 0 }
282 };
283
284 const struct format_ops ecoff_format_ops =
285 {
286 bfd_target_ecoff_flavour,
287 0, /* dfl_leading_underscore. */
288
289 /* FIXME: A comment why emit_section_symbols is different here (1) from
290 the single-format definition (0) would be in order. */
291 1, /* emit_section_symbols. */
292 0, /* begin. */
293 ecoff_new_file,
294 obj_ecoff_frob_symbol,
295 ecoff_frob_file,
296 0, /* frob_file_before_adjust. */
297 ecoff_frob_file_before_fix,
298 0, /* frob_file_after_relocs. */
299 0, /* s_get_size. */
300 0, /* s_set_size. */
301 0, /* s_get_align. */
302 0, /* s_set_align. */
303 0, /* s_get_other. */
304 0, /* s_set_other. */
305 0, /* s_get_desc. */
306 0, /* s_set_desc. */
307 0, /* s_get_type. */
308 0, /* s_set_type. */
309 0, /* copy_symbol_attributes. */
310 ecoff_generate_asm_lineno,
311 ecoff_stab,
312 ecoff_separate_stab_sections,
313 0, /* init_stab_section. */
314 ecoff_sec_sym_ok_for_reloc,
315 ecoff_pop_insert,
316 ecoff_set_ext,
317 ecoff_read_begin_hook,
318 ecoff_symbol_new_hook,
319 ecoff_symbol_clone_hook,
320 0 /* adjust_symtab. */
321 };