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252b5132 RH |
1 | /* b.out object file format |
2 | Copyright (C) 1989, 90, 91, 92, 93, 94, 95, 1996 | |
3 | Free Software Foundation, Inc. | |
4 | ||
5 | This file is part of GAS, the GNU Assembler. | |
6 | ||
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. | |
11 | ||
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. | |
16 | ||
8fc2b121 ILT |
17 | You should have received a copy of the GNU General Public License |
18 | along with GAS; see the file COPYING. If not, write to the Free | |
19 | Software Foundation, 59 Temple Place - Suite 330, Boston, MA | |
20 | 02111-1307, USA. */ | |
252b5132 RH |
21 | |
22 | #include "as.h" | |
23 | #include "obstack.h" | |
24 | const short /* in: segT out: N_TYPE bits */ | |
25 | seg_N_TYPE[] = | |
26 | { | |
27 | N_ABS, | |
28 | N_TEXT, | |
29 | N_DATA, | |
30 | N_BSS, | |
31 | N_UNDF, /* unknown */ | |
32 | N_UNDF, /* error */ | |
33 | N_UNDF, /* expression */ | |
34 | N_UNDF, /* debug */ | |
35 | N_UNDF, /* ntv */ | |
36 | N_UNDF, /* ptv */ | |
37 | N_REGISTER, /* register */ | |
38 | }; | |
39 | ||
40 | const segT N_TYPE_seg[N_TYPE + 2] = | |
41 | { /* N_TYPE == 0x1E = 32-2 */ | |
42 | SEG_UNKNOWN, /* N_UNDF == 0 */ | |
43 | SEG_GOOF, | |
44 | SEG_ABSOLUTE, /* N_ABS == 2 */ | |
45 | SEG_GOOF, | |
46 | SEG_TEXT, /* N_TEXT == 4 */ | |
47 | SEG_GOOF, | |
48 | SEG_DATA, /* N_DATA == 6 */ | |
49 | SEG_GOOF, | |
50 | SEG_BSS, /* N_BSS == 8 */ | |
51 | 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, SEG_GOOF, SEG_GOOF, SEG_GOOF, SEG_GOOF, | |
54 | SEG_GOOF, SEG_GOOF, SEG_GOOF, SEG_GOOF, | |
55 | SEG_REGISTER, /* dummy N_REGISTER for regs = 30 */ | |
56 | SEG_GOOF, | |
57 | }; | |
58 | ||
59 | static void obj_bout_line PARAMS ((int)); | |
60 | ||
61 | const pseudo_typeS obj_pseudo_table[] = | |
62 | { | |
63 | {"line", obj_bout_line, 0}, /* source code line number */ | |
64 | ||
65 | /* coff debugging directives. Currently ignored silently */ | |
66 | {"def", s_ignore, 0}, | |
67 | {"dim", s_ignore, 0}, | |
68 | {"endef", s_ignore, 0}, | |
69 | {"ln", s_ignore, 0}, | |
70 | {"scl", s_ignore, 0}, | |
71 | {"size", s_ignore, 0}, | |
72 | {"tag", s_ignore, 0}, | |
73 | {"type", s_ignore, 0}, | |
74 | {"val", s_ignore, 0}, | |
75 | ||
76 | /* other stuff we don't handle */ | |
77 | {"ABORT", s_ignore, 0}, | |
78 | {"ident", s_ignore, 0}, | |
79 | ||
80 | {NULL} /* end sentinel */ | |
81 | }; /* obj_pseudo_table */ | |
82 | ||
83 | /* Relocation. */ | |
84 | ||
85 | /* | |
86 | * emit_relocations() | |
87 | * | |
88 | * Crawl along a fixS chain. Emit the segment's relocations. | |
89 | */ | |
90 | void | |
91 | obj_emit_relocations (where, fixP, segment_address_in_file) | |
92 | char **where; | |
93 | fixS *fixP; /* Fixup chain for this segment. */ | |
94 | relax_addressT segment_address_in_file; | |
95 | { | |
96 | for (; fixP; fixP = fixP->fx_next) | |
97 | { | |
98 | if (fixP->fx_done == 0 | |
99 | || fixP->fx_r_type != NO_RELOC) | |
100 | { | |
101 | symbolS *sym; | |
102 | ||
103 | sym = fixP->fx_addsy; | |
104 | while (sym->sy_value.X_op == O_symbol | |
105 | && (! S_IS_DEFINED (sym) || S_IS_COMMON (sym))) | |
106 | sym = sym->sy_value.X_add_symbol; | |
107 | fixP->fx_addsy = sym; | |
108 | ||
109 | tc_bout_fix_to_chars (*where, fixP, segment_address_in_file); | |
110 | *where += sizeof (struct relocation_info); | |
111 | } /* if there's a symbol */ | |
112 | } /* for each fixup */ | |
113 | ||
114 | } /* emit_relocations() */ | |
115 | ||
116 | /* Aout file generation & utilities */ | |
117 | ||
118 | /* Convert a lvalue to machine dependent data */ | |
119 | void | |
120 | obj_header_append (where, headers) | |
121 | char **where; | |
122 | object_headers *headers; | |
123 | { | |
124 | /* Always leave in host byte order */ | |
125 | ||
126 | headers->header.a_talign = section_alignment[SEG_TEXT]; | |
127 | ||
128 | if (headers->header.a_talign < 2) | |
129 | { | |
130 | headers->header.a_talign = 2; | |
131 | } /* force to at least 2 */ | |
132 | ||
133 | headers->header.a_dalign = section_alignment[SEG_DATA]; | |
134 | headers->header.a_balign = section_alignment[SEG_BSS]; | |
135 | ||
136 | headers->header.a_tload = 0; | |
137 | headers->header.a_dload = md_section_align (SEG_DATA, H_GET_TEXT_SIZE (headers)); | |
138 | ||
139 | headers->header.a_relaxable = linkrelax; | |
140 | ||
141 | #ifdef CROSS_COMPILE | |
142 | md_number_to_chars (*where, headers->header.a_magic, sizeof (headers->header.a_magic)); | |
143 | *where += sizeof (headers->header.a_magic); | |
144 | md_number_to_chars (*where, headers->header.a_text, sizeof (headers->header.a_text)); | |
145 | *where += sizeof (headers->header.a_text); | |
146 | md_number_to_chars (*where, headers->header.a_data, sizeof (headers->header.a_data)); | |
147 | *where += sizeof (headers->header.a_data); | |
148 | md_number_to_chars (*where, headers->header.a_bss, sizeof (headers->header.a_bss)); | |
149 | *where += sizeof (headers->header.a_bss); | |
150 | md_number_to_chars (*where, headers->header.a_syms, sizeof (headers->header.a_syms)); | |
151 | *where += sizeof (headers->header.a_syms); | |
152 | md_number_to_chars (*where, headers->header.a_entry, sizeof (headers->header.a_entry)); | |
153 | *where += sizeof (headers->header.a_entry); | |
154 | md_number_to_chars (*where, headers->header.a_trsize, sizeof (headers->header.a_trsize)); | |
155 | *where += sizeof (headers->header.a_trsize); | |
156 | md_number_to_chars (*where, headers->header.a_drsize, sizeof (headers->header.a_drsize)); | |
157 | *where += sizeof (headers->header.a_drsize); | |
158 | md_number_to_chars (*where, headers->header.a_tload, sizeof (headers->header.a_tload)); | |
159 | *where += sizeof (headers->header.a_tload); | |
160 | md_number_to_chars (*where, headers->header.a_dload, sizeof (headers->header.a_dload)); | |
161 | *where += sizeof (headers->header.a_dload); | |
162 | md_number_to_chars (*where, headers->header.a_talign, sizeof (headers->header.a_talign)); | |
163 | *where += sizeof (headers->header.a_talign); | |
164 | md_number_to_chars (*where, headers->header.a_dalign, sizeof (headers->header.a_dalign)); | |
165 | *where += sizeof (headers->header.a_dalign); | |
166 | md_number_to_chars (*where, headers->header.a_balign, sizeof (headers->header.a_balign)); | |
167 | *where += sizeof (headers->header.a_balign); | |
168 | md_number_to_chars (*where, headers->header.a_relaxable, sizeof (headers->header.a_relaxable)); | |
169 | *where += sizeof (headers->header.a_relaxable); | |
170 | #else /* ! CROSS_COMPILE */ | |
171 | append (where, (char *) &headers->header, sizeof (headers->header)); | |
172 | #endif /* ! CROSS_COMPILE */ | |
173 | } /* a_header_append() */ | |
174 | ||
175 | void | |
176 | obj_symbol_to_chars (where, symbolP) | |
177 | char **where; | |
178 | symbolS *symbolP; | |
179 | { | |
180 | md_number_to_chars ((char *) &(S_GET_OFFSET (symbolP)), S_GET_OFFSET (symbolP), sizeof (S_GET_OFFSET (symbolP))); | |
181 | md_number_to_chars ((char *) &(S_GET_DESC (symbolP)), S_GET_DESC (symbolP), sizeof (S_GET_DESC (symbolP))); | |
182 | md_number_to_chars ((char *) &symbolP->sy_symbol.n_value, S_GET_VALUE (symbolP), sizeof (symbolP->sy_symbol.n_value)); | |
183 | ||
184 | append (where, (char *) &symbolP->sy_symbol, sizeof (obj_symbol_type)); | |
185 | } /* obj_symbol_to_chars() */ | |
186 | ||
187 | void | |
188 | obj_emit_symbols (where, symbol_rootP) | |
189 | char **where; | |
190 | symbolS *symbol_rootP; | |
191 | { | |
192 | symbolS *symbolP; | |
193 | ||
194 | /* | |
195 | * Emit all symbols left in the symbol chain. | |
196 | */ | |
197 | for (symbolP = symbol_rootP; symbolP; symbolP = symbol_next (symbolP)) | |
198 | { | |
199 | /* Used to save the offset of the name. It is used to point | |
200 | to the string in memory but must be a file offset. */ | |
201 | char *temp; | |
202 | ||
203 | temp = S_GET_NAME (symbolP); | |
204 | S_SET_OFFSET (symbolP, symbolP->sy_name_offset); | |
205 | ||
206 | /* Any symbol still undefined and is not a dbg symbol is made N_EXT. */ | |
207 | if (!S_IS_DEBUG (symbolP) && !S_IS_DEFINED (symbolP)) | |
208 | S_SET_EXTERNAL (symbolP); | |
209 | ||
210 | obj_symbol_to_chars (where, symbolP); | |
211 | S_SET_NAME (symbolP, temp); | |
212 | } | |
213 | } /* emit_symbols() */ | |
214 | ||
215 | void | |
216 | obj_symbol_new_hook (symbolP) | |
217 | symbolS *symbolP; | |
218 | { | |
219 | S_SET_OTHER (symbolP, 0); | |
220 | S_SET_DESC (symbolP, 0); | |
221 | } | |
222 | ||
223 | static void | |
224 | obj_bout_line (ignore) | |
225 | int ignore; | |
226 | { | |
227 | /* Assume delimiter is part of expression. */ | |
228 | /* BSD4.2 as fails with delightful bug, so we */ | |
229 | /* are not being incompatible here. */ | |
230 | new_logical_line ((char *) NULL, (int) (get_absolute_expression ())); | |
231 | demand_empty_rest_of_line (); | |
232 | } /* obj_bout_line() */ | |
233 | ||
234 | void | |
235 | obj_read_begin_hook () | |
236 | { | |
237 | } | |
238 | ||
239 | void | |
240 | obj_crawl_symbol_chain (headers) | |
241 | object_headers *headers; | |
242 | { | |
243 | symbolS **symbolPP; | |
244 | symbolS *symbolP; | |
245 | int symbol_number = 0; | |
246 | ||
247 | tc_crawl_symbol_chain (headers); | |
248 | ||
249 | symbolPP = &symbol_rootP; /*->last symbol chain link. */ | |
250 | while ((symbolP = *symbolPP) != NULL) | |
251 | { | |
252 | if (flag_readonly_data_in_text && (S_GET_SEGMENT (symbolP) == SEG_DATA)) | |
253 | { | |
254 | S_SET_SEGMENT (symbolP, SEG_TEXT); | |
255 | } /* if pusing data into text */ | |
256 | ||
257 | resolve_symbol_value (symbolP, 1); | |
258 | ||
259 | /* Skip symbols which were equated to undefined or common | |
260 | symbols. */ | |
261 | if (symbolP->sy_value.X_op == O_symbol | |
262 | && (! S_IS_DEFINED (symbolP) || S_IS_COMMON (symbolP))) | |
263 | { | |
264 | *symbolPP = symbol_next (symbolP); | |
265 | continue; | |
266 | } | |
267 | ||
268 | /* OK, here is how we decide which symbols go out into the | |
269 | brave new symtab. Symbols that do are: | |
270 | ||
271 | * symbols with no name (stabd's?) | |
272 | * symbols with debug info in their N_TYPE | |
273 | ||
274 | Symbols that don't are: | |
275 | * symbols that are registers | |
276 | * symbols with \1 as their 3rd character (numeric labels) | |
277 | * "local labels" as defined by S_LOCAL_NAME(name) | |
278 | if the -L switch was passed to gas. | |
279 | ||
280 | All other symbols are output. We complain if a deleted | |
281 | symbol was marked external. */ | |
282 | ||
283 | ||
284 | if (1 | |
285 | && !S_IS_REGISTER (symbolP) | |
286 | && (!S_GET_NAME (symbolP) | |
287 | || S_IS_DEBUG (symbolP) | |
288 | #ifdef TC_I960 | |
289 | /* FIXME-SOON this ifdef seems highly dubious to me. xoxorich. */ | |
290 | || !S_IS_DEFINED (symbolP) | |
291 | || S_IS_EXTERNAL (symbolP) | |
292 | #endif /* TC_I960 */ | |
293 | || (S_GET_NAME (symbolP)[0] != '\001' && (flag_keep_locals || !S_LOCAL_NAME (symbolP))))) | |
294 | { | |
295 | symbolP->sy_number = symbol_number++; | |
296 | ||
297 | /* The + 1 after strlen account for the \0 at the | |
298 | end of each string */ | |
299 | if (!S_IS_STABD (symbolP)) | |
300 | { | |
301 | /* Ordinary case. */ | |
302 | symbolP->sy_name_offset = string_byte_count; | |
303 | string_byte_count += strlen (S_GET_NAME (symbolP)) + 1; | |
304 | } | |
305 | else /* .Stabd case. */ | |
306 | symbolP->sy_name_offset = 0; | |
307 | symbolPP = &(symbol_next (symbolP)); | |
308 | } | |
309 | else | |
310 | { | |
311 | if (S_IS_EXTERNAL (symbolP) || !S_IS_DEFINED (symbolP)) | |
312 | { | |
313 | as_bad (_("Local symbol %s never defined"), S_GET_NAME (symbolP)); | |
314 | } /* oops. */ | |
315 | ||
316 | /* Unhook it from the chain */ | |
317 | *symbolPP = symbol_next (symbolP); | |
318 | } /* if this symbol should be in the output */ | |
319 | } /* for each symbol */ | |
320 | ||
321 | H_SET_SYMBOL_TABLE_SIZE (headers, symbol_number); | |
322 | } | |
323 | ||
324 | /* | |
325 | * Find strings by crawling along symbol table chain. | |
326 | */ | |
327 | ||
328 | void | |
329 | obj_emit_strings (where) | |
330 | char **where; | |
331 | { | |
332 | symbolS *symbolP; | |
333 | ||
334 | #ifdef CROSS_COMPILE | |
335 | /* Gotta do md_ byte-ordering stuff for string_byte_count first - KWK */ | |
336 | md_number_to_chars (*where, string_byte_count, sizeof (string_byte_count)); | |
337 | *where += sizeof (string_byte_count); | |
338 | #else /* CROSS_COMPILE */ | |
339 | append (where, (char *) &string_byte_count, (unsigned long) sizeof (string_byte_count)); | |
340 | #endif /* CROSS_COMPILE */ | |
341 | ||
342 | for (symbolP = symbol_rootP; symbolP; symbolP = symbol_next (symbolP)) | |
343 | { | |
344 | if (S_GET_NAME (symbolP)) | |
345 | append (where, S_GET_NAME (symbolP), (unsigned long) (strlen (S_GET_NAME (symbolP)) + 1)); | |
346 | } /* walk symbol chain */ | |
347 | } | |
348 | ||
349 | /* end of obj-bout.c */ |