Commit | Line | Data |
---|---|---|
fecd2382 | 1 | /* b.out object file format |
011d16ac ILT |
2 | Copyright (C) 1989, 90, 91, 92, 93, 94, 95, 1996 |
3 | Free Software Foundation, Inc. | |
355afbcd | 4 | |
a39116f1 | 5 | This file is part of GAS, the GNU Assembler. |
355afbcd | 6 | |
a39116f1 RP |
7 | GAS is free software; you can redistribute it and/or modify |
8 | it under the terms of the GNU General Public License as | |
9 | published by the Free Software Foundation; either version 2, | |
10 | or (at your option) any later version. | |
355afbcd | 11 | |
a39116f1 RP |
12 | GAS is distributed in the hope that it will be useful, but |
13 | WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See | |
15 | the GNU General Public License for more details. | |
355afbcd | 16 | |
a39116f1 RP |
17 | You should have received a copy of the GNU General Public |
18 | License along with GAS; see the file COPYING. If not, write | |
a2a5a4fa | 19 | to the Free Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ |
fecd2382 | 20 | |
fecd2382 RP |
21 | #include "as.h" |
22 | #include "obstack.h" | |
355afbcd KR |
23 | const short /* in: segT out: N_TYPE bits */ |
24 | seg_N_TYPE[] = | |
25 | { | |
26 | N_ABS, | |
27 | N_TEXT, | |
28 | N_DATA, | |
29 | N_BSS, | |
30 | N_UNDF, /* unknown */ | |
355afbcd | 31 | N_UNDF, /* error */ |
5ac34ac3 ILT |
32 | N_UNDF, /* expression */ |
33 | N_UNDF, /* debug */ | |
34 | N_UNDF, /* ntv */ | |
35 | N_UNDF, /* ptv */ | |
355afbcd KR |
36 | N_REGISTER, /* register */ |
37 | }; | |
38 | ||
39 | const segT N_TYPE_seg[N_TYPE + 2] = | |
40 | { /* N_TYPE == 0x1E = 32-2 */ | |
41 | SEG_UNKNOWN, /* N_UNDF == 0 */ | |
42 | SEG_GOOF, | |
43 | SEG_ABSOLUTE, /* N_ABS == 2 */ | |
44 | SEG_GOOF, | |
45 | SEG_TEXT, /* N_TEXT == 4 */ | |
46 | SEG_GOOF, | |
47 | SEG_DATA, /* N_DATA == 6 */ | |
48 | SEG_GOOF, | |
49 | SEG_BSS, /* N_BSS == 8 */ | |
50 | SEG_GOOF, | |
51 | SEG_GOOF, SEG_GOOF, SEG_GOOF, SEG_GOOF, SEG_GOOF, SEG_GOOF, SEG_GOOF, SEG_GOOF, | |
52 | SEG_GOOF, SEG_GOOF, SEG_GOOF, SEG_GOOF, SEG_GOOF, SEG_GOOF, SEG_GOOF, SEG_GOOF, | |
53 | SEG_GOOF, SEG_GOOF, SEG_GOOF, SEG_GOOF, | |
54 | SEG_REGISTER, /* dummy N_REGISTER for regs = 30 */ | |
55 | SEG_GOOF, | |
fecd2382 RP |
56 | }; |
57 | ||
4f0bccc7 | 58 | static void obj_bout_line PARAMS ((int)); |
fecd2382 | 59 | |
355afbcd KR |
60 | const pseudo_typeS obj_pseudo_table[] = |
61 | { | |
355afbcd | 62 | {"line", obj_bout_line, 0}, /* source code line number */ |
355afbcd KR |
63 | |
64 | /* coff debugging directives. Currently ignored silently */ | |
65 | {"def", s_ignore, 0}, | |
66 | {"dim", s_ignore, 0}, | |
67 | {"endef", s_ignore, 0}, | |
68 | {"ln", s_ignore, 0}, | |
69 | {"scl", s_ignore, 0}, | |
70 | {"size", s_ignore, 0}, | |
71 | {"tag", s_ignore, 0}, | |
72 | {"type", s_ignore, 0}, | |
73 | {"val", s_ignore, 0}, | |
74 | ||
75 | /* other stuff we don't handle */ | |
76 | {"ABORT", s_ignore, 0}, | |
77 | {"ident", s_ignore, 0}, | |
78 | ||
79 | {NULL} /* end sentinel */ | |
80 | }; /* obj_pseudo_table */ | |
fecd2382 RP |
81 | |
82 | /* Relocation. */ | |
83 | ||
fecd2382 RP |
84 | /* |
85 | * emit_relocations() | |
86 | * | |
87 | * Crawl along a fixS chain. Emit the segment's relocations. | |
88 | */ | |
355afbcd KR |
89 | void |
90 | obj_emit_relocations (where, fixP, segment_address_in_file) | |
91 | char **where; | |
92 | fixS *fixP; /* Fixup chain for this segment. */ | |
93 | relax_addressT segment_address_in_file; | |
fecd2382 | 94 | { |
355afbcd KR |
95 | for (; fixP; fixP = fixP->fx_next) |
96 | { | |
98c6bbbe | 97 | if (fixP->fx_done == 0 |
355afbcd KR |
98 | || fixP->fx_r_type != NO_RELOC) |
99 | { | |
e24cf2b5 ILT |
100 | symbolS *sym; |
101 | ||
102 | sym = fixP->fx_addsy; | |
103 | while (sym->sy_value.X_op == O_symbol | |
104 | && (! S_IS_DEFINED (sym) || S_IS_COMMON (sym))) | |
105 | sym = sym->sy_value.X_add_symbol; | |
106 | fixP->fx_addsy = sym; | |
107 | ||
355afbcd KR |
108 | tc_bout_fix_to_chars (*where, fixP, segment_address_in_file); |
109 | *where += sizeof (struct relocation_info); | |
110 | } /* if there's a symbol */ | |
111 | } /* for each fixup */ | |
112 | ||
113 | } /* emit_relocations() */ | |
fecd2382 RP |
114 | |
115 | /* Aout file generation & utilities */ | |
116 | ||
117 | /* Convert a lvalue to machine dependent data */ | |
355afbcd KR |
118 | void |
119 | obj_header_append (where, headers) | |
120 | char **where; | |
121 | object_headers *headers; | |
fecd2382 | 122 | { |
355afbcd KR |
123 | /* Always leave in host byte order */ |
124 | ||
125 | headers->header.a_talign = section_alignment[SEG_TEXT]; | |
126 | ||
127 | if (headers->header.a_talign < 2) | |
128 | { | |
129 | headers->header.a_talign = 2; | |
130 | } /* force to at least 2 */ | |
131 | ||
132 | headers->header.a_dalign = section_alignment[SEG_DATA]; | |
133 | headers->header.a_balign = section_alignment[SEG_BSS]; | |
134 | ||
135 | headers->header.a_tload = 0; | |
136 | headers->header.a_dload = md_section_align (SEG_DATA, H_GET_TEXT_SIZE (headers)); | |
137 | ||
138 | headers->header.a_relaxable = linkrelax; | |
462088b8 | 139 | |
8ae35e59 | 140 | #ifdef CROSS_COMPILE |
355afbcd KR |
141 | md_number_to_chars (*where, headers->header.a_magic, sizeof (headers->header.a_magic)); |
142 | *where += sizeof (headers->header.a_magic); | |
143 | md_number_to_chars (*where, headers->header.a_text, sizeof (headers->header.a_text)); | |
144 | *where += sizeof (headers->header.a_text); | |
145 | md_number_to_chars (*where, headers->header.a_data, sizeof (headers->header.a_data)); | |
146 | *where += sizeof (headers->header.a_data); | |
147 | md_number_to_chars (*where, headers->header.a_bss, sizeof (headers->header.a_bss)); | |
148 | *where += sizeof (headers->header.a_bss); | |
149 | md_number_to_chars (*where, headers->header.a_syms, sizeof (headers->header.a_syms)); | |
150 | *where += sizeof (headers->header.a_syms); | |
151 | md_number_to_chars (*where, headers->header.a_entry, sizeof (headers->header.a_entry)); | |
152 | *where += sizeof (headers->header.a_entry); | |
153 | md_number_to_chars (*where, headers->header.a_trsize, sizeof (headers->header.a_trsize)); | |
154 | *where += sizeof (headers->header.a_trsize); | |
155 | md_number_to_chars (*where, headers->header.a_drsize, sizeof (headers->header.a_drsize)); | |
156 | *where += sizeof (headers->header.a_drsize); | |
157 | md_number_to_chars (*where, headers->header.a_tload, sizeof (headers->header.a_tload)); | |
158 | *where += sizeof (headers->header.a_tload); | |
159 | md_number_to_chars (*where, headers->header.a_dload, sizeof (headers->header.a_dload)); | |
160 | *where += sizeof (headers->header.a_dload); | |
161 | md_number_to_chars (*where, headers->header.a_talign, sizeof (headers->header.a_talign)); | |
162 | *where += sizeof (headers->header.a_talign); | |
163 | md_number_to_chars (*where, headers->header.a_dalign, sizeof (headers->header.a_dalign)); | |
164 | *where += sizeof (headers->header.a_dalign); | |
165 | md_number_to_chars (*where, headers->header.a_balign, sizeof (headers->header.a_balign)); | |
166 | *where += sizeof (headers->header.a_balign); | |
167 | md_number_to_chars (*where, headers->header.a_relaxable, sizeof (headers->header.a_relaxable)); | |
168 | *where += sizeof (headers->header.a_relaxable); | |
8ae35e59 | 169 | #else /* ! CROSS_COMPILE */ |
355afbcd | 170 | append (where, (char *) &headers->header, sizeof (headers->header)); |
8ae35e59 | 171 | #endif /* ! CROSS_COMPILE */ |
355afbcd | 172 | } /* a_header_append() */ |
fecd2382 | 173 | |
355afbcd KR |
174 | void |
175 | obj_symbol_to_chars (where, symbolP) | |
176 | char **where; | |
177 | symbolS *symbolP; | |
fecd2382 | 178 | { |
355afbcd KR |
179 | md_number_to_chars ((char *) &(S_GET_OFFSET (symbolP)), S_GET_OFFSET (symbolP), sizeof (S_GET_OFFSET (symbolP))); |
180 | md_number_to_chars ((char *) &(S_GET_DESC (symbolP)), S_GET_DESC (symbolP), sizeof (S_GET_DESC (symbolP))); | |
85051959 | 181 | md_number_to_chars ((char *) &symbolP->sy_symbol.n_value, S_GET_VALUE (symbolP), sizeof (symbolP->sy_symbol.n_value)); |
8ae35e59 | 182 | |
355afbcd KR |
183 | append (where, (char *) &symbolP->sy_symbol, sizeof (obj_symbol_type)); |
184 | } /* obj_symbol_to_chars() */ | |
fecd2382 | 185 | |
355afbcd KR |
186 | void |
187 | obj_emit_symbols (where, symbol_rootP) | |
188 | char **where; | |
189 | symbolS *symbol_rootP; | |
fecd2382 | 190 | { |
355afbcd KR |
191 | symbolS *symbolP; |
192 | ||
193 | /* | |
a39116f1 RP |
194 | * Emit all symbols left in the symbol chain. |
195 | */ | |
355afbcd KR |
196 | for (symbolP = symbol_rootP; symbolP; symbolP = symbol_next (symbolP)) |
197 | { | |
198 | /* Used to save the offset of the name. It is used to point | |
a39116f1 | 199 | to the string in memory but must be a file offset. */ |
355afbcd KR |
200 | char *temp; |
201 | ||
202 | temp = S_GET_NAME (symbolP); | |
203 | S_SET_OFFSET (symbolP, symbolP->sy_name_offset); | |
204 | ||
205 | /* Any symbol still undefined and is not a dbg symbol is made N_EXT. */ | |
206 | if (!S_IS_DEBUG (symbolP) && !S_IS_DEFINED (symbolP)) | |
207 | S_SET_EXTERNAL (symbolP); | |
fecd2382 | 208 | |
355afbcd KR |
209 | obj_symbol_to_chars (where, symbolP); |
210 | S_SET_NAME (symbolP, temp); | |
211 | } | |
212 | } /* emit_symbols() */ | |
213 | ||
214 | void | |
215 | obj_symbol_new_hook (symbolP) | |
216 | symbolS *symbolP; | |
217 | { | |
218 | S_SET_OTHER (symbolP, 0); | |
219 | S_SET_DESC (symbolP, 0); | |
c999fd9f | 220 | } |
355afbcd KR |
221 | |
222 | static void | |
4f0bccc7 ILT |
223 | obj_bout_line (ignore) |
224 | int ignore; | |
fecd2382 | 225 | { |
355afbcd KR |
226 | /* Assume delimiter is part of expression. */ |
227 | /* BSD4.2 as fails with delightful bug, so we */ | |
228 | /* are not being incompatible here. */ | |
229 | new_logical_line ((char *) NULL, (int) (get_absolute_expression ())); | |
230 | demand_empty_rest_of_line (); | |
231 | } /* obj_bout_line() */ | |
fecd2382 | 232 | |
355afbcd KR |
233 | void |
234 | obj_read_begin_hook () | |
235 | { | |
c999fd9f | 236 | } |
fecd2382 | 237 | |
355afbcd KR |
238 | void |
239 | obj_crawl_symbol_chain (headers) | |
240 | object_headers *headers; | |
fecd2382 | 241 | { |
355afbcd KR |
242 | symbolS **symbolPP; |
243 | symbolS *symbolP; | |
244 | int symbol_number = 0; | |
245 | ||
355afbcd KR |
246 | tc_crawl_symbol_chain (headers); |
247 | ||
248 | symbolPP = &symbol_rootP; /*->last symbol chain link. */ | |
249 | while ((symbolP = *symbolPP) != NULL) | |
250 | { | |
def66e24 | 251 | if (flag_readonly_data_in_text && (S_GET_SEGMENT (symbolP) == SEG_DATA)) |
355afbcd KR |
252 | { |
253 | S_SET_SEGMENT (symbolP, SEG_TEXT); | |
254 | } /* if pusing data into text */ | |
255 | ||
8cf777d6 | 256 | resolve_symbol_value (symbolP, 1); |
355afbcd | 257 | |
e24cf2b5 ILT |
258 | /* Skip symbols which were equated to undefined or common |
259 | symbols. */ | |
260 | if (symbolP->sy_value.X_op == O_symbol | |
261 | && (! S_IS_DEFINED (symbolP) || S_IS_COMMON (symbolP))) | |
262 | { | |
263 | *symbolPP = symbol_next (symbolP); | |
264 | continue; | |
265 | } | |
266 | ||
355afbcd | 267 | /* OK, here is how we decide which symbols go out into the |
4f0bccc7 | 268 | brave new symtab. Symbols that do are: |
355afbcd | 269 | |
4f0bccc7 ILT |
270 | * symbols with no name (stabd's?) |
271 | * symbols with debug info in their N_TYPE | |
355afbcd | 272 | |
4f0bccc7 ILT |
273 | Symbols that don't are: |
274 | * symbols that are registers | |
275 | * symbols with \1 as their 3rd character (numeric labels) | |
276 | * "local labels" as defined by S_LOCAL_NAME(name) | |
277 | if the -L switch was passed to gas. | |
355afbcd | 278 | |
4f0bccc7 ILT |
279 | All other symbols are output. We complain if a deleted |
280 | symbol was marked external. */ | |
355afbcd KR |
281 | |
282 | ||
283 | if (1 | |
284 | && !S_IS_REGISTER (symbolP) | |
285 | && (!S_GET_NAME (symbolP) | |
286 | || S_IS_DEBUG (symbolP) | |
fecd2382 | 287 | #ifdef TC_I960 |
355afbcd KR |
288 | /* FIXME-SOON this ifdef seems highly dubious to me. xoxorich. */ |
289 | || !S_IS_DEFINED (symbolP) | |
290 | || S_IS_EXTERNAL (symbolP) | |
fecd2382 | 291 | #endif /* TC_I960 */ |
def66e24 | 292 | || (S_GET_NAME (symbolP)[0] != '\001' && (flag_keep_locals || !S_LOCAL_NAME (symbolP))))) |
355afbcd KR |
293 | { |
294 | symbolP->sy_number = symbol_number++; | |
295 | ||
296 | /* The + 1 after strlen account for the \0 at the | |
fecd2382 | 297 | end of each string */ |
355afbcd KR |
298 | if (!S_IS_STABD (symbolP)) |
299 | { | |
300 | /* Ordinary case. */ | |
301 | symbolP->sy_name_offset = string_byte_count; | |
302 | string_byte_count += strlen (S_GET_NAME (symbolP)) + 1; | |
303 | } | |
304 | else /* .Stabd case. */ | |
305 | symbolP->sy_name_offset = 0; | |
306 | symbolPP = &(symbol_next (symbolP)); | |
307 | } | |
308 | else | |
309 | { | |
310 | if (S_IS_EXTERNAL (symbolP) || !S_IS_DEFINED (symbolP)) | |
311 | { | |
312 | as_bad ("Local symbol %s never defined", S_GET_NAME (symbolP)); | |
313 | } /* oops. */ | |
314 | ||
315 | /* Unhook it from the chain */ | |
316 | *symbolPP = symbol_next (symbolP); | |
317 | } /* if this symbol should be in the output */ | |
318 | } /* for each symbol */ | |
319 | ||
320 | H_SET_SYMBOL_TABLE_SIZE (headers, symbol_number); | |
c999fd9f | 321 | } |
fecd2382 RP |
322 | |
323 | /* | |
324 | * Find strings by crawling along symbol table chain. | |
325 | */ | |
326 | ||
355afbcd KR |
327 | void |
328 | obj_emit_strings (where) | |
329 | char **where; | |
fecd2382 | 330 | { |
355afbcd KR |
331 | symbolS *symbolP; |
332 | ||
3cc6716d | 333 | #ifdef CROSS_COMPILE |
355afbcd KR |
334 | /* Gotta do md_ byte-ordering stuff for string_byte_count first - KWK */ |
335 | md_number_to_chars (*where, string_byte_count, sizeof (string_byte_count)); | |
336 | *where += sizeof (string_byte_count); | |
3cc6716d | 337 | #else /* CROSS_COMPILE */ |
355afbcd | 338 | append (where, (char *) &string_byte_count, (unsigned long) sizeof (string_byte_count)); |
3cc6716d | 339 | #endif /* CROSS_COMPILE */ |
355afbcd KR |
340 | |
341 | for (symbolP = symbol_rootP; symbolP; symbolP = symbol_next (symbolP)) | |
342 | { | |
343 | if (S_GET_NAME (symbolP)) | |
344 | append (where, S_GET_NAME (symbolP), (unsigned long) (strlen (S_GET_NAME (symbolP)) + 1)); | |
345 | } /* walk symbol chain */ | |
c999fd9f | 346 | } |
fecd2382 | 347 | |
fecd2382 | 348 | /* end of obj-bout.c */ |