Commit | Line | Data |
---|---|---|
252b5132 | 1 | /* a.out object file format |
b3adc24a | 2 | Copyright (C) 1989-2020 Free Software Foundation, Inc. |
252b5132 | 3 | |
ea1562b3 | 4 | This file is part of GAS, the GNU Assembler. |
252b5132 | 5 | |
ea1562b3 NC |
6 | GAS is free software; you can redistribute it and/or modify |
7 | it under the terms of the GNU General Public License as | |
ec2655a6 | 8 | published by the Free Software Foundation; either version 3, |
ea1562b3 | 9 | or (at your option) any later version. |
252b5132 | 10 | |
ea1562b3 NC |
11 | GAS 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 | |
14 | the GNU General Public License for more details. | |
252b5132 | 15 | |
ea1562b3 NC |
16 | You should have received a copy of the GNU General Public License |
17 | along with GAS; see the file COPYING. If not, write to the Free | |
4b4da160 NC |
18 | Software Foundation, 51 Franklin Street - Fifth Floor, Boston, MA |
19 | 02110-1301, USA. */ | |
252b5132 | 20 | |
4c63da97 AM |
21 | #define OBJ_HEADER "obj-aout.h" |
22 | ||
252b5132 | 23 | #include "as.h" |
252b5132 RH |
24 | #undef NO_RELOC |
25 | #include "aout/aout64.h" | |
252b5132 | 26 | |
252b5132 | 27 | void |
ea1562b3 | 28 | obj_aout_frob_symbol (symbolS *sym, int *punt ATTRIBUTE_UNUSED) |
252b5132 RH |
29 | { |
30 | flagword flags; | |
31 | asection *sec; | |
87975d2a | 32 | int type; |
252b5132 | 33 | |
49309057 | 34 | flags = symbol_get_bfdsym (sym)->flags; |
4c63da97 | 35 | type = aout_symbol (symbol_get_bfdsym (sym))->type; |
49309057 | 36 | sec = S_GET_SEGMENT (sym); |
252b5132 RH |
37 | |
38 | /* Only frob simple symbols this way right now. */ | |
39 | if (! (type & ~ (N_TYPE | N_EXT))) | |
40 | { | |
41 | if (type == (N_UNDF | N_EXT) | |
45dfa85a | 42 | && sec == bfd_abs_section_ptr) |
49309057 ILT |
43 | { |
44 | sec = bfd_und_section_ptr; | |
45 | S_SET_SEGMENT (sym, sec); | |
46 | } | |
252b5132 RH |
47 | |
48 | if ((type & N_TYPE) != N_INDR | |
49 | && (type & N_TYPE) != N_SETA | |
50 | && (type & N_TYPE) != N_SETT | |
51 | && (type & N_TYPE) != N_SETD | |
52 | && (type & N_TYPE) != N_SETB | |
53 | && type != N_WARNING | |
45dfa85a AM |
54 | && (sec == bfd_abs_section_ptr |
55 | || sec == bfd_und_section_ptr)) | |
252b5132 RH |
56 | return; |
57 | if (flags & BSF_EXPORT) | |
58 | type |= N_EXT; | |
59 | ||
60 | switch (type & N_TYPE) | |
61 | { | |
62 | case N_SETA: | |
63 | case N_SETT: | |
64 | case N_SETD: | |
65 | case N_SETB: | |
66 | /* Set the debugging flag for constructor symbols so that | |
67 | BFD leaves them alone. */ | |
49309057 | 68 | symbol_get_bfdsym (sym)->flags |= BSF_DEBUGGING; |
252b5132 RH |
69 | |
70 | /* You can't put a common symbol in a set. The way a set | |
71 | element works is that the symbol has a definition and a | |
72 | name, and the linker adds the definition to the set of | |
73 | that name. That does not work for a common symbol, | |
74 | because the linker can't tell which common symbol the | |
75 | user means. FIXME: Using as_bad here may be | |
76 | inappropriate, since the user may want to force a | |
77 | particular type without regard to the semantics of sets; | |
78 | on the other hand, we certainly don't want anybody to be | |
79 | mislead into thinking that their code will work. */ | |
80 | if (S_IS_COMMON (sym)) | |
81 | as_bad (_("Attempt to put a common symbol into set %s"), | |
82 | S_GET_NAME (sym)); | |
83 | /* Similarly, you can't put an undefined symbol in a set. */ | |
84 | else if (! S_IS_DEFINED (sym)) | |
85 | as_bad (_("Attempt to put an undefined symbol into set %s"), | |
86 | S_GET_NAME (sym)); | |
87 | ||
88 | break; | |
89 | case N_INDR: | |
90 | /* Put indirect symbols in the indirect section. */ | |
49309057 ILT |
91 | S_SET_SEGMENT (sym, bfd_ind_section_ptr); |
92 | symbol_get_bfdsym (sym)->flags |= BSF_INDIRECT; | |
252b5132 RH |
93 | if (type & N_EXT) |
94 | { | |
49309057 ILT |
95 | symbol_get_bfdsym (sym)->flags |= BSF_EXPORT; |
96 | symbol_get_bfdsym (sym)->flags &=~ BSF_LOCAL; | |
252b5132 RH |
97 | } |
98 | break; | |
99 | case N_WARNING: | |
100 | /* Mark warning symbols. */ | |
49309057 | 101 | symbol_get_bfdsym (sym)->flags |= BSF_WARNING; |
252b5132 RH |
102 | break; |
103 | } | |
104 | } | |
105 | else | |
ea1562b3 | 106 | symbol_get_bfdsym (sym)->flags |= BSF_DEBUGGING; |
252b5132 | 107 | |
4c63da97 | 108 | aout_symbol (symbol_get_bfdsym (sym))->type = type; |
252b5132 RH |
109 | |
110 | /* Double check weak symbols. */ | |
ea1562b3 NC |
111 | if (S_IS_WEAK (sym) && S_IS_COMMON (sym)) |
112 | as_bad (_("Symbol `%s' can not be both weak and common"), | |
113 | S_GET_NAME (sym)); | |
252b5132 RH |
114 | } |
115 | ||
dda2980f AM |
116 | /* Relocation processing may require knowing the VMAs of the sections. |
117 | Writing to a section will cause the BFD back end to compute the | |
118 | VMAs. This function also ensures that file size is large enough | |
119 | to cover a_text and a_data should text or data be the last section | |
120 | in the file. */ | |
121 | ||
252b5132 | 122 | void |
ea1562b3 | 123 | obj_aout_frob_file_before_fix (void) |
252b5132 | 124 | { |
dda2980f AM |
125 | asection *sec; |
126 | bfd_vma *sizep = NULL; | |
127 | if ((sec = data_section)->size != 0) | |
128 | sizep = &exec_hdr (stdoutput)->a_data; | |
129 | else if ((sec = text_section)->size != 0) | |
130 | sizep = &exec_hdr (stdoutput)->a_text; | |
131 | if (sizep) | |
f616c36b | 132 | { |
dda2980f AM |
133 | bfd_size_type size = sec->size; |
134 | bfd_byte b = 0; | |
135 | ||
136 | gas_assert (bfd_set_section_contents (stdoutput, sec, &b, size - 1, 1)); | |
137 | ||
138 | /* We don't know the aligned size until after VMAs and sizes are | |
139 | set on the bfd_set_section_contents call. If that size is | |
140 | larger than the section then write again to ensure the file | |
141 | contents extend to cover the aligned size. */ | |
142 | if (*sizep > size) | |
f616c36b | 143 | { |
dda2980f AM |
144 | file_ptr pos = sec->filepos + *sizep; |
145 | ||
146 | gas_assert (bfd_seek (stdoutput, pos - 1, SEEK_SET) == 0 | |
147 | && bfd_bwrite (&b, 1, stdoutput) == 1); | |
148 | } | |
f616c36b | 149 | } |
252b5132 RH |
150 | } |
151 | ||
252b5132 | 152 | static void |
ea1562b3 | 153 | obj_aout_line (int ignore ATTRIBUTE_UNUSED) |
252b5132 RH |
154 | { |
155 | /* Assume delimiter is part of expression. | |
156 | BSD4.2 as fails with delightful bug, so we | |
dcd619be | 157 | are not being incompatible here. */ |
252b5132 RH |
158 | new_logical_line ((char *) NULL, (int) (get_absolute_expression ())); |
159 | demand_empty_rest_of_line (); | |
ea1562b3 | 160 | } |
252b5132 RH |
161 | |
162 | /* Handle .weak. This is a GNU extension. */ | |
163 | ||
164 | static void | |
ea1562b3 | 165 | obj_aout_weak (int ignore ATTRIBUTE_UNUSED) |
252b5132 RH |
166 | { |
167 | char *name; | |
168 | int c; | |
169 | symbolS *symbolP; | |
170 | ||
171 | do | |
172 | { | |
d02603dc | 173 | c = get_symbol_name (&name); |
252b5132 | 174 | symbolP = symbol_find_or_make (name); |
d02603dc | 175 | (void) restore_line_pointer (c); |
252b5132 RH |
176 | SKIP_WHITESPACE (); |
177 | S_SET_WEAK (symbolP); | |
178 | if (c == ',') | |
179 | { | |
180 | input_line_pointer++; | |
181 | SKIP_WHITESPACE (); | |
182 | if (*input_line_pointer == '\n') | |
183 | c = '\n'; | |
184 | } | |
185 | } | |
186 | while (c == ','); | |
187 | demand_empty_rest_of_line (); | |
188 | } | |
189 | ||
190 | /* Handle .type. On {Net,Open}BSD, this is used to set the n_other field, | |
191 | which is then apparently used when doing dynamic linking. Older | |
9d87310a | 192 | versions of gas ignored the .type pseudo-op, so we also ignore it if |
252b5132 RH |
193 | we can't parse it. */ |
194 | ||
195 | static void | |
ea1562b3 | 196 | obj_aout_type (int ignore ATTRIBUTE_UNUSED) |
252b5132 RH |
197 | { |
198 | char *name; | |
199 | int c; | |
200 | symbolS *sym; | |
201 | ||
d02603dc | 202 | c = get_symbol_name (&name); |
9d87310a | 203 | sym = symbol_find_or_make (name); |
d02603dc | 204 | (void) restore_line_pointer (c); |
9d87310a HPN |
205 | SKIP_WHITESPACE (); |
206 | if (*input_line_pointer == ',') | |
252b5132 | 207 | { |
9d87310a | 208 | ++input_line_pointer; |
252b5132 | 209 | SKIP_WHITESPACE (); |
9d87310a | 210 | if (*input_line_pointer == '@') |
252b5132 RH |
211 | { |
212 | ++input_line_pointer; | |
9d87310a | 213 | if (strncmp (input_line_pointer, "object", 6) == 0) |
53fbb48a | 214 | S_SET_OTHER (sym, 1); |
9d87310a | 215 | else if (strncmp (input_line_pointer, "function", 8) == 0) |
53fbb48a | 216 | S_SET_OTHER (sym, 2); |
252b5132 RH |
217 | } |
218 | } | |
219 | ||
220 | /* Ignore everything else on the line. */ | |
221 | s_ignore (0); | |
222 | } | |
223 | ||
4c63da97 AM |
224 | /* Support for an AOUT emulation. */ |
225 | ||
4c63da97 | 226 | static void |
ea1562b3 | 227 | aout_pop_insert (void) |
4c63da97 AM |
228 | { |
229 | pop_insert (aout_pseudo_table); | |
230 | } | |
231 | ||
232 | static int | |
ea1562b3 | 233 | obj_aout_s_get_other (symbolS *sym) |
4c63da97 AM |
234 | { |
235 | return aout_symbol (symbol_get_bfdsym (sym))->other; | |
236 | } | |
237 | ||
5110c57e | 238 | static void |
ea1562b3 | 239 | obj_aout_s_set_other (symbolS *sym, int o) |
5110c57e HPN |
240 | { |
241 | aout_symbol (symbol_get_bfdsym (sym))->other = o; | |
242 | } | |
243 | ||
244 | static int | |
ea1562b3 | 245 | obj_aout_sec_sym_ok_for_reloc (asection *sec ATTRIBUTE_UNUSED) |
5110c57e HPN |
246 | { |
247 | return obj_sec_sym_ok_for_reloc (sec); | |
248 | } | |
249 | ||
250 | static void | |
ea1562b3 NC |
251 | obj_aout_process_stab (segT seg ATTRIBUTE_UNUSED, |
252 | int w, | |
253 | const char *s, | |
254 | int t, | |
255 | int o, | |
256 | int d) | |
5110c57e HPN |
257 | { |
258 | aout_process_stab (w, s, t, o, d); | |
259 | } | |
260 | ||
4c63da97 | 261 | static int |
ea1562b3 | 262 | obj_aout_s_get_desc (symbolS *sym) |
4c63da97 AM |
263 | { |
264 | return aout_symbol (symbol_get_bfdsym (sym))->desc; | |
265 | } | |
266 | ||
5110c57e | 267 | static void |
ea1562b3 | 268 | obj_aout_s_set_desc (symbolS *sym, int d) |
5110c57e HPN |
269 | { |
270 | aout_symbol (symbol_get_bfdsym (sym))->desc = d; | |
271 | } | |
272 | ||
273 | static int | |
ea1562b3 | 274 | obj_aout_s_get_type (symbolS *sym) |
5110c57e HPN |
275 | { |
276 | return aout_symbol (symbol_get_bfdsym (sym))->type; | |
277 | } | |
278 | ||
279 | static void | |
ea1562b3 | 280 | obj_aout_s_set_type (symbolS *sym, int t) |
5110c57e HPN |
281 | { |
282 | aout_symbol (symbol_get_bfdsym (sym))->type = t; | |
283 | } | |
284 | ||
285 | static int | |
ea1562b3 | 286 | obj_aout_separate_stab_sections (void) |
5110c57e HPN |
287 | { |
288 | return 0; | |
289 | } | |
4c63da97 | 290 | |
5110c57e HPN |
291 | /* When changed, make sure these table entries match the single-format |
292 | definitions in obj-aout.h. */ | |
ea1562b3 | 293 | |
4c63da97 AM |
294 | const struct format_ops aout_format_ops = |
295 | { | |
296 | bfd_target_aout_flavour, | |
ea1562b3 NC |
297 | 1, /* dfl_leading_underscore. */ |
298 | 0, /* emit_section_symbols. */ | |
299 | 0, /* begin. */ | |
300 | 0, /* app_file. */ | |
4c63da97 | 301 | obj_aout_frob_symbol, |
ea1562b3 NC |
302 | 0, /* frob_file. */ |
303 | 0, /* frob_file_before_adjust. */ | |
a161fe53 | 304 | obj_aout_frob_file_before_fix, |
ea1562b3 NC |
305 | 0, /* frob_file_after_relocs. */ |
306 | 0, /* s_get_size. */ | |
307 | 0, /* s_set_size. */ | |
308 | 0, /* s_get_align. */ | |
309 | 0, /* s_set_align. */ | |
4c63da97 | 310 | obj_aout_s_get_other, |
5110c57e | 311 | obj_aout_s_set_other, |
4c63da97 | 312 | obj_aout_s_get_desc, |
5110c57e HPN |
313 | obj_aout_s_set_desc, |
314 | obj_aout_s_get_type, | |
315 | obj_aout_s_set_type, | |
ea1562b3 NC |
316 | 0, /* copy_symbol_attributes. */ |
317 | 0, /* generate_asm_lineno. */ | |
5110c57e HPN |
318 | obj_aout_process_stab, |
319 | obj_aout_separate_stab_sections, | |
ea1562b3 | 320 | 0, /* init_stab_section. */ |
5110c57e | 321 | obj_aout_sec_sym_ok_for_reloc, |
4c63da97 | 322 | aout_pop_insert, |
ea1562b3 NC |
323 | 0, /* ecoff_set_ext. */ |
324 | 0, /* read_begin_hook. */ | |
645ea3ea AM |
325 | 0, /* symbol_new_hook. */ |
326 | 0, /* symbol_clone_hook. */ | |
327 | 0 /* adjust_symtab. */ | |
4c63da97 | 328 | }; |
ea1562b3 NC |
329 | |
330 | const pseudo_typeS aout_pseudo_table[] = | |
331 | { | |
332 | {"line", obj_aout_line, 0}, /* Source code line number. */ | |
333 | {"ln", obj_aout_line, 0}, /* COFF line number that we use anyway. */ | |
334 | ||
335 | {"weak", obj_aout_weak, 0}, /* Mark symbol as weak. */ | |
336 | ||
337 | {"type", obj_aout_type, 0}, | |
338 | ||
339 | /* coff debug pseudos (ignored) */ | |
340 | {"def", s_ignore, 0}, | |
341 | {"dim", s_ignore, 0}, | |
342 | {"endef", s_ignore, 0}, | |
343 | {"ident", s_ignore, 0}, | |
344 | {"line", s_ignore, 0}, | |
345 | {"ln", s_ignore, 0}, | |
346 | {"scl", s_ignore, 0}, | |
347 | {"size", s_ignore, 0}, | |
348 | {"tag", s_ignore, 0}, | |
349 | {"val", s_ignore, 0}, | |
350 | {"version", s_ignore, 0}, | |
351 | ||
352 | {"optim", s_ignore, 0}, /* For sun386i cc (?). */ | |
353 | ||
354 | /* other stuff */ | |
355 | {"ABORT", s_abort, 0}, | |
356 | ||
357 | {NULL, NULL, 0} | |
358 | }; |