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Commit | Line | Data |
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252b5132 | 1 | /* write.c - emit .o file |
f7e42eb4 | 2 | Copyright 1986, 1987, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, |
0af1713e | 3 | 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008 |
252b5132 RH |
4 | Free Software Foundation, Inc. |
5 | ||
6 | This file is part of GAS, the GNU Assembler. | |
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 | |
ec2655a6 | 10 | the Free Software Foundation; either version 3, or (at your option) |
252b5132 RH |
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 | |
4b4da160 NC |
20 | Software Foundation, 51 Franklin Street - Fifth Floor, Boston, MA |
21 | 02110-1301, USA. */ | |
252b5132 | 22 | |
efaf0ba4 | 23 | /* This thing should be set up to do byteordering correctly. But... */ |
252b5132 RH |
24 | |
25 | #include "as.h" | |
26 | #include "subsegs.h" | |
27 | #include "obstack.h" | |
28 | #include "output-file.h" | |
220e750f | 29 | #include "dwarf2dbg.h" |
e7ff5c73 | 30 | #include "libbfd.h" |
252b5132 | 31 | |
252b5132 | 32 | #ifndef TC_ADJUST_RELOC_COUNT |
df44284e | 33 | #define TC_ADJUST_RELOC_COUNT(FIX, COUNT) |
252b5132 RH |
34 | #endif |
35 | ||
36 | #ifndef TC_FORCE_RELOCATION | |
a161fe53 | 37 | #define TC_FORCE_RELOCATION(FIX) \ |
ae6063d4 | 38 | (generic_force_reloc (FIX)) |
252b5132 RH |
39 | #endif |
40 | ||
a161fe53 AM |
41 | #ifndef TC_FORCE_RELOCATION_ABS |
42 | #define TC_FORCE_RELOCATION_ABS(FIX) \ | |
43 | (TC_FORCE_RELOCATION (FIX)) | |
44 | #endif | |
45 | ||
46 | #ifndef TC_FORCE_RELOCATION_LOCAL | |
47 | #define TC_FORCE_RELOCATION_LOCAL(FIX) \ | |
48 | (!(FIX)->fx_pcrel \ | |
a161fe53 AM |
49 | || TC_FORCE_RELOCATION (FIX)) |
50 | #endif | |
51 | ||
52 | #ifndef TC_FORCE_RELOCATION_SUB_SAME | |
53 | #define TC_FORCE_RELOCATION_SUB_SAME(FIX, SEG) \ | |
426318c5 | 54 | (! SEG_NORMAL (SEG)) |
a161fe53 AM |
55 | #endif |
56 | ||
9a97a5d7 AM |
57 | #ifndef md_register_arithmetic |
58 | # define md_register_arithmetic 1 | |
59 | #endif | |
60 | ||
a161fe53 | 61 | #ifndef TC_FORCE_RELOCATION_SUB_ABS |
9a97a5d7 AM |
62 | #define TC_FORCE_RELOCATION_SUB_ABS(FIX, SEG) \ |
63 | (!md_register_arithmetic && (SEG) == reg_section) | |
a161fe53 AM |
64 | #endif |
65 | ||
66 | #ifndef TC_FORCE_RELOCATION_SUB_LOCAL | |
67 | #ifdef DIFF_EXPR_OK | |
4f3cafa2 | 68 | #define TC_FORCE_RELOCATION_SUB_LOCAL(FIX) 0 |
a161fe53 | 69 | #else |
4f3cafa2 | 70 | #define TC_FORCE_RELOCATION_SUB_LOCAL(FIX) 1 |
a161fe53 AM |
71 | #endif |
72 | #endif | |
73 | ||
74 | #ifndef TC_VALIDATE_FIX_SUB | |
75 | #ifdef UNDEFINED_DIFFERENCE_OK | |
76 | /* The PA needs this for PIC code generation. */ | |
77 | #define TC_VALIDATE_FIX_SUB(FIX) 1 | |
78 | #else | |
a161fe53 AM |
79 | #define TC_VALIDATE_FIX_SUB(FIX) \ |
80 | ((FIX)->fx_r_type == BFD_RELOC_GPREL32 \ | |
81 | || (FIX)->fx_r_type == BFD_RELOC_GPREL16) | |
a161fe53 | 82 | #endif |
252b5132 RH |
83 | #endif |
84 | ||
58a77e41 EC |
85 | #ifndef TC_LINKRELAX_FIXUP |
86 | #define TC_LINKRELAX_FIXUP(SEG) 1 | |
87 | #endif | |
88 | ||
a161fe53 AM |
89 | #ifndef MD_APPLY_SYM_VALUE |
90 | #define MD_APPLY_SYM_VALUE(FIX) 1 | |
8f36cd18 | 91 | #endif |
ef99799a | 92 | |
87548816 NC |
93 | #ifndef TC_FINALIZE_SYMS_BEFORE_SIZE_SEG |
94 | #define TC_FINALIZE_SYMS_BEFORE_SIZE_SEG 1 | |
95 | #endif | |
96 | ||
252b5132 | 97 | #ifndef MD_PCREL_FROM_SECTION |
df44284e | 98 | #define MD_PCREL_FROM_SECTION(FIX, SEC) md_pcrel_from (FIX) |
252b5132 RH |
99 | #endif |
100 | ||
c9cd7160 L |
101 | #ifndef TC_FAKE_LABEL |
102 | #define TC_FAKE_LABEL(NAME) (strcmp ((NAME), FAKE_LABEL_NAME) == 0) | |
103 | #endif | |
104 | ||
d31f0f6d AM |
105 | /* Positive values of TC_FX_SIZE_SLACK allow a target to define |
106 | fixups that far past the end of a frag. Having such fixups | |
107 | is of course most most likely a bug in setting fx_size correctly. | |
108 | A negative value disables the fixup check entirely, which is | |
109 | appropriate for something like the Renesas / SuperH SH_COUNT | |
110 | reloc. */ | |
111 | #ifndef TC_FX_SIZE_SLACK | |
112 | #define TC_FX_SIZE_SLACK(FIX) 0 | |
113 | #endif | |
114 | ||
6386f3a7 AM |
115 | /* Used to control final evaluation of expressions. */ |
116 | int finalize_syms = 0; | |
e46d99eb | 117 | |
252b5132 | 118 | int symbol_table_frozen; |
a161fe53 AM |
119 | |
120 | symbolS *abs_section_sym; | |
121 | ||
26346241 AM |
122 | /* Remember the value of dot when parsing expressions. */ |
123 | addressT dot_value; | |
124 | ||
05e9452c AM |
125 | /* Relocs generated by ".reloc" pseudo. */ |
126 | struct reloc_list* reloc_list; | |
127 | ||
d7342424 | 128 | void print_fixup (fixS *); |
252b5132 | 129 | |
252b5132 RH |
130 | /* We generally attach relocs to frag chains. However, after we have |
131 | chained these all together into a segment, any relocs we add after | |
132 | that must be attached to a segment. This will include relocs added | |
133 | in md_estimate_size_for_relax, for example. */ | |
134 | static int frags_chained = 0; | |
252b5132 RH |
135 | |
136 | static int n_fixups; | |
137 | ||
df44284e | 138 | #define RELOC_ENUM enum bfd_reloc_code_real |
df44284e | 139 | |
efaf0ba4 NC |
140 | /* Create a fixS in obstack 'notes'. */ |
141 | ||
252b5132 | 142 | static fixS * |
d7342424 KH |
143 | fix_new_internal (fragS *frag, /* Which frag? */ |
144 | int where, /* Where in that frag? */ | |
145 | int size, /* 1, 2, or 4 usually. */ | |
146 | symbolS *add_symbol, /* X_add_symbol. */ | |
147 | symbolS *sub_symbol, /* X_op_symbol. */ | |
148 | offsetT offset, /* X_add_number. */ | |
149 | int pcrel, /* TRUE if PC-relative relocation. */ | |
150 | RELOC_ENUM r_type ATTRIBUTE_UNUSED /* Relocation type. */) | |
252b5132 RH |
151 | { |
152 | fixS *fixP; | |
153 | ||
154 | n_fixups++; | |
155 | ||
e7ff5c73 | 156 | fixP = obstack_alloc (¬es, sizeof (fixS)); |
252b5132 RH |
157 | |
158 | fixP->fx_frag = frag; | |
159 | fixP->fx_where = where; | |
160 | fixP->fx_size = size; | |
161 | /* We've made fx_size a narrow field; check that it's wide enough. */ | |
162 | if (fixP->fx_size != size) | |
163 | { | |
164 | as_bad (_("field fx_size too small to hold %d"), size); | |
165 | abort (); | |
166 | } | |
167 | fixP->fx_addsy = add_symbol; | |
168 | fixP->fx_subsy = sub_symbol; | |
169 | fixP->fx_offset = offset; | |
26346241 | 170 | fixP->fx_dot_value = dot_value; |
252b5132 | 171 | fixP->fx_pcrel = pcrel; |
252b5132 | 172 | fixP->fx_r_type = r_type; |
252b5132 RH |
173 | fixP->fx_im_disp = 0; |
174 | fixP->fx_pcrel_adjust = 0; | |
175 | fixP->fx_bit_fixP = 0; | |
176 | fixP->fx_addnumber = 0; | |
177 | fixP->fx_tcbit = 0; | |
20ee54e8 | 178 | fixP->fx_tcbit2 = 0; |
252b5132 RH |
179 | fixP->fx_done = 0; |
180 | fixP->fx_no_overflow = 0; | |
181 | fixP->fx_signed = 0; | |
182 | ||
183 | #ifdef USING_CGEN | |
184 | fixP->fx_cgen.insn = NULL; | |
185 | fixP->fx_cgen.opinfo = 0; | |
186 | #endif | |
187 | ||
188 | #ifdef TC_FIX_TYPE | |
efaf0ba4 | 189 | TC_INIT_FIX_DATA (fixP); |
252b5132 RH |
190 | #endif |
191 | ||
192 | as_where (&fixP->fx_file, &fixP->fx_line); | |
193 | ||
194 | /* Usually, we want relocs sorted numerically, but while | |
195 | comparing to older versions of gas that have relocs | |
196 | reverse sorted, it is convenient to have this compile | |
efaf0ba4 | 197 | time option. xoxorich. */ |
252b5132 RH |
198 | { |
199 | ||
252b5132 RH |
200 | fixS **seg_fix_rootP = (frags_chained |
201 | ? &seg_info (now_seg)->fix_root | |
202 | : &frchain_now->fix_root); | |
203 | fixS **seg_fix_tailP = (frags_chained | |
204 | ? &seg_info (now_seg)->fix_tail | |
205 | : &frchain_now->fix_tail); | |
252b5132 RH |
206 | |
207 | #ifdef REVERSE_SORT_RELOCS | |
208 | ||
209 | fixP->fx_next = *seg_fix_rootP; | |
210 | *seg_fix_rootP = fixP; | |
211 | ||
efaf0ba4 | 212 | #else /* REVERSE_SORT_RELOCS */ |
252b5132 RH |
213 | |
214 | fixP->fx_next = NULL; | |
215 | ||
216 | if (*seg_fix_tailP) | |
217 | (*seg_fix_tailP)->fx_next = fixP; | |
218 | else | |
219 | *seg_fix_rootP = fixP; | |
220 | *seg_fix_tailP = fixP; | |
221 | ||
efaf0ba4 | 222 | #endif /* REVERSE_SORT_RELOCS */ |
252b5132 RH |
223 | } |
224 | ||
225 | return fixP; | |
226 | } | |
227 | ||
228 | /* Create a fixup relative to a symbol (plus a constant). */ | |
229 | ||
230 | fixS * | |
d7342424 KH |
231 | fix_new (fragS *frag, /* Which frag? */ |
232 | int where, /* Where in that frag? */ | |
233 | int size, /* 1, 2, or 4 usually. */ | |
234 | symbolS *add_symbol, /* X_add_symbol. */ | |
235 | offsetT offset, /* X_add_number. */ | |
236 | int pcrel, /* TRUE if PC-relative relocation. */ | |
237 | RELOC_ENUM r_type /* Relocation type. */) | |
252b5132 RH |
238 | { |
239 | return fix_new_internal (frag, where, size, add_symbol, | |
240 | (symbolS *) NULL, offset, pcrel, r_type); | |
241 | } | |
242 | ||
243 | /* Create a fixup for an expression. Currently we only support fixups | |
244 | for difference expressions. That is itself more than most object | |
245 | file formats support anyhow. */ | |
246 | ||
247 | fixS * | |
d7342424 KH |
248 | fix_new_exp (fragS *frag, /* Which frag? */ |
249 | int where, /* Where in that frag? */ | |
250 | int size, /* 1, 2, or 4 usually. */ | |
251 | expressionS *exp, /* Expression. */ | |
252 | int pcrel, /* TRUE if PC-relative relocation. */ | |
253 | RELOC_ENUM r_type /* Relocation type. */) | |
252b5132 RH |
254 | { |
255 | symbolS *add = NULL; | |
256 | symbolS *sub = NULL; | |
257 | offsetT off = 0; | |
258 | ||
259 | switch (exp->X_op) | |
260 | { | |
261 | case O_absent: | |
262 | break; | |
263 | ||
37006e43 NC |
264 | case O_register: |
265 | as_bad (_("register value used as expression")); | |
266 | break; | |
267 | ||
252b5132 RH |
268 | case O_add: |
269 | /* This comes up when _GLOBAL_OFFSET_TABLE_+(.-L0) is read, if | |
270 | the difference expression cannot immediately be reduced. */ | |
271 | { | |
272 | symbolS *stmp = make_expr_symbol (exp); | |
58a77e41 | 273 | |
252b5132 RH |
274 | exp->X_op = O_symbol; |
275 | exp->X_op_symbol = 0; | |
276 | exp->X_add_symbol = stmp; | |
277 | exp->X_add_number = 0; | |
58a77e41 | 278 | |
252b5132 RH |
279 | return fix_new_exp (frag, where, size, exp, pcrel, r_type); |
280 | } | |
281 | ||
282 | case O_symbol_rva: | |
283 | add = exp->X_add_symbol; | |
284 | off = exp->X_add_number; | |
252b5132 | 285 | r_type = BFD_RELOC_RVA; |
252b5132 RH |
286 | break; |
287 | ||
288 | case O_uminus: | |
289 | sub = exp->X_add_symbol; | |
290 | off = exp->X_add_number; | |
291 | break; | |
292 | ||
293 | case O_subtract: | |
294 | sub = exp->X_op_symbol; | |
295 | /* Fall through. */ | |
296 | case O_symbol: | |
297 | add = exp->X_add_symbol; | |
efaf0ba4 | 298 | /* Fall through. */ |
252b5132 RH |
299 | case O_constant: |
300 | off = exp->X_add_number; | |
301 | break; | |
302 | ||
303 | default: | |
304 | add = make_expr_symbol (exp); | |
305 | break; | |
306 | } | |
307 | ||
efaf0ba4 | 308 | return fix_new_internal (frag, where, size, add, sub, off, pcrel, r_type); |
252b5132 RH |
309 | } |
310 | ||
ae6063d4 AM |
311 | /* Generic function to determine whether a fixup requires a relocation. */ |
312 | int | |
d7342424 | 313 | generic_force_reloc (fixS *fix) |
ae6063d4 | 314 | { |
ae6063d4 AM |
315 | if (fix->fx_r_type == BFD_RELOC_VTABLE_INHERIT |
316 | || fix->fx_r_type == BFD_RELOC_VTABLE_ENTRY) | |
317 | return 1; | |
7be1c489 | 318 | |
61e192bf NC |
319 | if (fix->fx_addsy == NULL) |
320 | return 0; | |
321 | ||
ae6063d4 AM |
322 | return S_FORCE_RELOC (fix->fx_addsy, fix->fx_subsy == NULL); |
323 | } | |
324 | ||
252b5132 RH |
325 | /* Append a string onto another string, bumping the pointer along. */ |
326 | void | |
d7342424 | 327 | append (char **charPP, char *fromP, unsigned long length) |
252b5132 | 328 | { |
efaf0ba4 | 329 | /* Don't trust memcpy() of 0 chars. */ |
252b5132 RH |
330 | if (length == 0) |
331 | return; | |
332 | ||
333 | memcpy (*charPP, fromP, length); | |
334 | *charPP += length; | |
335 | } | |
336 | ||
efaf0ba4 NC |
337 | /* This routine records the largest alignment seen for each segment. |
338 | If the beginning of the segment is aligned on the worst-case | |
339 | boundary, all of the other alignments within it will work. At | |
340 | least one object format really uses this info. */ | |
341 | ||
252b5132 | 342 | void |
d7342424 KH |
343 | record_alignment (/* Segment to which alignment pertains. */ |
344 | segT seg, | |
345 | /* Alignment, as a power of 2 (e.g., 1 => 2-byte | |
346 | boundary, 2 => 4-byte boundary, etc.) */ | |
347 | int align) | |
252b5132 RH |
348 | { |
349 | if (seg == absolute_section) | |
350 | return; | |
7be1c489 | 351 | |
252b5132 RH |
352 | if ((unsigned int) align > bfd_get_section_alignment (stdoutput, seg)) |
353 | bfd_set_section_alignment (stdoutput, seg, align); | |
252b5132 RH |
354 | } |
355 | ||
0a9ef439 | 356 | int |
d7342424 | 357 | get_recorded_alignment (segT seg) |
0a9ef439 RH |
358 | { |
359 | if (seg == absolute_section) | |
360 | return 0; | |
7be1c489 | 361 | |
0a9ef439 | 362 | return bfd_get_section_alignment (stdoutput, seg); |
0a9ef439 RH |
363 | } |
364 | ||
252b5132 RH |
365 | /* Reset the section indices after removing the gas created sections. */ |
366 | ||
367 | static void | |
e7ff5c73 | 368 | renumber_sections (bfd *abfd ATTRIBUTE_UNUSED, asection *sec, void *countparg) |
252b5132 RH |
369 | { |
370 | int *countp = (int *) countparg; | |
371 | ||
372 | sec->index = *countp; | |
373 | ++*countp; | |
374 | } | |
375 | ||
252b5132 | 376 | static fragS * |
d7342424 | 377 | chain_frchains_together_1 (segT section, struct frchain *frchp) |
252b5132 RH |
378 | { |
379 | fragS dummy, *prev_frag = &dummy; | |
252b5132 | 380 | fixS fix_dummy, *prev_fix = &fix_dummy; |
252b5132 | 381 | |
c9049d30 | 382 | for (; frchp; frchp = frchp->frch_next) |
252b5132 RH |
383 | { |
384 | prev_frag->fr_next = frchp->frch_root; | |
385 | prev_frag = frchp->frch_last; | |
386 | assert (prev_frag->fr_type != 0); | |
252b5132 RH |
387 | if (frchp->fix_root != (fixS *) NULL) |
388 | { | |
389 | if (seg_info (section)->fix_root == (fixS *) NULL) | |
390 | seg_info (section)->fix_root = frchp->fix_root; | |
391 | prev_fix->fx_next = frchp->fix_root; | |
392 | seg_info (section)->fix_tail = frchp->fix_tail; | |
393 | prev_fix = frchp->fix_tail; | |
394 | } | |
252b5132 RH |
395 | } |
396 | assert (prev_frag->fr_type != 0); | |
033cd5fd | 397 | assert (prev_frag != &dummy); |
252b5132 RH |
398 | prev_frag->fr_next = 0; |
399 | return prev_frag; | |
400 | } | |
401 | ||
252b5132 | 402 | static void |
d7342424 KH |
403 | chain_frchains_together (bfd *abfd ATTRIBUTE_UNUSED, |
404 | segT section, | |
e7ff5c73 | 405 | void *xxx ATTRIBUTE_UNUSED) |
252b5132 RH |
406 | { |
407 | segment_info_type *info; | |
408 | ||
409 | /* BFD may have introduced its own sections without using | |
410 | subseg_new, so it is possible that seg_info is NULL. */ | |
411 | info = seg_info (section); | |
412 | if (info != (segment_info_type *) NULL) | |
efaf0ba4 NC |
413 | info->frchainP->frch_last |
414 | = chain_frchains_together_1 (section, info->frchainP); | |
252b5132 RH |
415 | |
416 | /* Now that we've chained the frags together, we must add new fixups | |
417 | to the segment, not to the frag chain. */ | |
418 | frags_chained = 1; | |
419 | } | |
420 | ||
252b5132 | 421 | static void |
d7342424 | 422 | cvt_frag_to_fill (segT sec ATTRIBUTE_UNUSED, fragS *fragP) |
252b5132 RH |
423 | { |
424 | switch (fragP->fr_type) | |
425 | { | |
426 | case rs_align: | |
427 | case rs_align_code: | |
0a9ef439 | 428 | case rs_align_test: |
252b5132 RH |
429 | case rs_org: |
430 | case rs_space: | |
431 | #ifdef HANDLE_ALIGN | |
432 | HANDLE_ALIGN (fragP); | |
433 | #endif | |
434 | know (fragP->fr_next != NULL); | |
435 | fragP->fr_offset = (fragP->fr_next->fr_address | |
436 | - fragP->fr_address | |
437 | - fragP->fr_fix) / fragP->fr_var; | |
438 | if (fragP->fr_offset < 0) | |
439 | { | |
14ad458a ILT |
440 | as_bad_where (fragP->fr_file, fragP->fr_line, |
441 | _("attempt to .org/.space backwards? (%ld)"), | |
442 | (long) fragP->fr_offset); | |
3f3cdb03 | 443 | fragP->fr_offset = 0; |
252b5132 RH |
444 | } |
445 | fragP->fr_type = rs_fill; | |
446 | break; | |
447 | ||
448 | case rs_fill: | |
449 | break; | |
450 | ||
451 | case rs_leb128: | |
452 | { | |
453 | valueT value = S_GET_VALUE (fragP->fr_symbol); | |
454 | int size; | |
455 | ||
456 | size = output_leb128 (fragP->fr_literal + fragP->fr_fix, value, | |
457 | fragP->fr_subtype); | |
458 | ||
459 | fragP->fr_fix += size; | |
460 | fragP->fr_type = rs_fill; | |
461 | fragP->fr_var = 0; | |
462 | fragP->fr_offset = 0; | |
463 | fragP->fr_symbol = NULL; | |
464 | } | |
465 | break; | |
466 | ||
467 | case rs_cfa: | |
468 | eh_frame_convert_frag (fragP); | |
469 | break; | |
470 | ||
220e750f RH |
471 | case rs_dwarf2dbg: |
472 | dwarf2dbg_convert_frag (fragP); | |
473 | break; | |
474 | ||
252b5132 | 475 | case rs_machine_dependent: |
252b5132 | 476 | md_convert_frag (stdoutput, sec, fragP); |
252b5132 RH |
477 | |
478 | assert (fragP->fr_next == NULL | |
479 | || ((offsetT) (fragP->fr_next->fr_address - fragP->fr_address) | |
480 | == fragP->fr_fix)); | |
481 | ||
efaf0ba4 NC |
482 | /* After md_convert_frag, we make the frag into a ".space 0". |
483 | md_convert_frag() should set up any fixSs and constants | |
484 | required. */ | |
252b5132 RH |
485 | frag_wane (fragP); |
486 | break; | |
487 | ||
488 | #ifndef WORKING_DOT_WORD | |
489 | case rs_broken_word: | |
490 | { | |
491 | struct broken_word *lie; | |
492 | ||
493 | if (fragP->fr_subtype) | |
494 | { | |
495 | fragP->fr_fix += md_short_jump_size; | |
496 | for (lie = (struct broken_word *) (fragP->fr_symbol); | |
497 | lie && lie->dispfrag == fragP; | |
498 | lie = lie->next_broken_word) | |
499 | if (lie->added == 1) | |
500 | fragP->fr_fix += md_long_jump_size; | |
501 | } | |
502 | frag_wane (fragP); | |
503 | } | |
504 | break; | |
505 | #endif | |
506 | ||
507 | default: | |
508 | BAD_CASE (fragP->fr_type); | |
509 | break; | |
510 | } | |
09b935ac AM |
511 | #ifdef md_frag_check |
512 | md_frag_check (fragP); | |
513 | #endif | |
252b5132 RH |
514 | } |
515 | ||
32638454 AM |
516 | struct relax_seg_info |
517 | { | |
518 | int pass; | |
519 | int changed; | |
520 | }; | |
d7342424 | 521 | |
252b5132 | 522 | static void |
32638454 | 523 | relax_seg (bfd *abfd ATTRIBUTE_UNUSED, asection *sec, void *xxx) |
e46d99eb AM |
524 | { |
525 | segment_info_type *seginfo = seg_info (sec); | |
32638454 | 526 | struct relax_seg_info *info = (struct relax_seg_info *) xxx; |
e46d99eb AM |
527 | |
528 | if (seginfo && seginfo->frchainP | |
32638454 AM |
529 | && relax_segment (seginfo->frchainP->frch_root, sec, info->pass)) |
530 | info->changed = 1; | |
e46d99eb AM |
531 | } |
532 | ||
e46d99eb | 533 | static void |
e7ff5c73 | 534 | size_seg (bfd *abfd, asection *sec, void *xxx ATTRIBUTE_UNUSED) |
252b5132 RH |
535 | { |
536 | flagword flags; | |
537 | fragS *fragp; | |
538 | segment_info_type *seginfo; | |
539 | int x; | |
540 | valueT size, newsize; | |
541 | ||
542 | subseg_change (sec, 0); | |
543 | ||
252b5132 RH |
544 | seginfo = seg_info (sec); |
545 | if (seginfo && seginfo->frchainP) | |
546 | { | |
252b5132 RH |
547 | for (fragp = seginfo->frchainP->frch_root; fragp; fragp = fragp->fr_next) |
548 | cvt_frag_to_fill (sec, fragp); | |
549 | for (fragp = seginfo->frchainP->frch_root; | |
550 | fragp->fr_next; | |
551 | fragp = fragp->fr_next) | |
efaf0ba4 NC |
552 | /* Walk to last elt. */ |
553 | ; | |
252b5132 RH |
554 | size = fragp->fr_address + fragp->fr_fix; |
555 | } | |
556 | else | |
557 | size = 0; | |
558 | ||
e46d99eb AM |
559 | flags = bfd_get_section_flags (abfd, sec); |
560 | ||
252b5132 RH |
561 | if (size > 0 && ! seginfo->bss) |
562 | flags |= SEC_HAS_CONTENTS; | |
563 | ||
e5435dec | 564 | flags &= ~SEC_RELOC; |
252b5132 | 565 | x = bfd_set_section_flags (abfd, sec, flags); |
b34976b6 | 566 | assert (x); |
252b5132 RH |
567 | |
568 | newsize = md_section_align (sec, size); | |
569 | x = bfd_set_section_size (abfd, sec, newsize); | |
b34976b6 | 570 | assert (x); |
252b5132 RH |
571 | |
572 | /* If the size had to be rounded up, add some padding in the last | |
573 | non-empty frag. */ | |
574 | assert (newsize >= size); | |
575 | if (size != newsize) | |
576 | { | |
577 | fragS *last = seginfo->frchainP->frch_last; | |
578 | fragp = seginfo->frchainP->frch_root; | |
579 | while (fragp->fr_next != last) | |
580 | fragp = fragp->fr_next; | |
581 | last->fr_address = size; | |
18e1d487 AM |
582 | if ((newsize - size) % fragp->fr_var == 0) |
583 | fragp->fr_offset += (newsize - size) / fragp->fr_var; | |
584 | else | |
585 | /* If we hit this abort, it's likely due to subsegs_finish not | |
586 | providing sufficient alignment on the last frag, and the | |
587 | machine dependent code using alignment frags with fr_var | |
588 | greater than 1. */ | |
589 | abort (); | |
252b5132 RH |
590 | } |
591 | ||
592 | #ifdef tc_frob_section | |
593 | tc_frob_section (sec); | |
594 | #endif | |
595 | #ifdef obj_frob_section | |
596 | obj_frob_section (sec); | |
597 | #endif | |
598 | } | |
599 | ||
600 | #ifdef DEBUG2 | |
601 | static void | |
988392e2 | 602 | dump_section_relocs (bfd *abfd ATTRIBUTE_UNUSED, asection *sec, FILE *stream) |
252b5132 | 603 | { |
252b5132 RH |
604 | segment_info_type *seginfo = seg_info (sec); |
605 | fixS *fixp = seginfo->fix_root; | |
606 | ||
607 | if (!fixp) | |
608 | return; | |
609 | ||
610 | fprintf (stream, "sec %s relocs:\n", sec->name); | |
611 | while (fixp) | |
612 | { | |
613 | symbolS *s = fixp->fx_addsy; | |
e723ef7c ILT |
614 | |
615 | fprintf (stream, " %08lx: type %d ", (unsigned long) fixp, | |
616 | (int) fixp->fx_r_type); | |
617 | if (s == NULL) | |
618 | fprintf (stream, "no sym\n"); | |
619 | else | |
252b5132 | 620 | { |
e723ef7c ILT |
621 | print_symbol_value_1 (stream, s); |
622 | fprintf (stream, "\n"); | |
252b5132 | 623 | } |
252b5132 RH |
624 | fixp = fixp->fx_next; |
625 | } | |
626 | } | |
627 | #else | |
628 | #define dump_section_relocs(ABFD,SEC,STREAM) ((void) 0) | |
629 | #endif | |
630 | ||
631 | #ifndef EMIT_SECTION_SYMBOLS | |
632 | #define EMIT_SECTION_SYMBOLS 1 | |
633 | #endif | |
634 | ||
05e9452c AM |
635 | /* Resolve U.A.OFFSET_SYM and U.A.SYM fields of RELOC_LIST entries, |
636 | and check for validity. Convert RELOC_LIST from using U.A fields | |
637 | to U.B fields. */ | |
638 | static void | |
639 | resolve_reloc_expr_symbols (void) | |
640 | { | |
641 | struct reloc_list *r; | |
642 | ||
643 | for (r = reloc_list; r; r = r->next) | |
644 | { | |
645 | expressionS *symval; | |
646 | symbolS *sym; | |
647 | bfd_vma offset, addend; | |
648 | asection *sec; | |
649 | reloc_howto_type *howto; | |
650 | ||
651 | resolve_symbol_value (r->u.a.offset_sym); | |
652 | symval = symbol_get_value_expression (r->u.a.offset_sym); | |
653 | ||
654 | offset = 0; | |
655 | sym = NULL; | |
656 | if (symval->X_op == O_constant) | |
657 | sym = r->u.a.offset_sym; | |
658 | else if (symval->X_op == O_symbol) | |
659 | { | |
660 | sym = symval->X_add_symbol; | |
661 | offset = symval->X_add_number; | |
662 | symval = symbol_get_value_expression (symval->X_add_symbol); | |
663 | } | |
664 | if (sym == NULL | |
665 | || symval->X_op != O_constant | |
666 | || (sec = S_GET_SEGMENT (sym)) == NULL | |
667 | || !SEG_NORMAL (sec)) | |
668 | { | |
669 | as_bad_where (r->file, r->line, _("invalid offset expression")); | |
670 | sec = NULL; | |
671 | } | |
672 | else | |
673 | offset += S_GET_VALUE (sym); | |
674 | ||
675 | sym = NULL; | |
676 | addend = r->u.a.addend; | |
677 | if (r->u.a.sym != NULL) | |
678 | { | |
679 | resolve_symbol_value (r->u.a.sym); | |
680 | symval = symbol_get_value_expression (r->u.a.sym); | |
681 | if (symval->X_op == O_constant) | |
682 | sym = r->u.a.sym; | |
683 | else if (symval->X_op == O_symbol) | |
684 | { | |
685 | sym = symval->X_add_symbol; | |
686 | addend += symval->X_add_number; | |
687 | symval = symbol_get_value_expression (symval->X_add_symbol); | |
688 | } | |
689 | if (symval->X_op != O_constant) | |
690 | { | |
691 | as_bad_where (r->file, r->line, _("invalid reloc expression")); | |
692 | sec = NULL; | |
693 | } | |
694 | else if (sym != NULL) | |
695 | symbol_mark_used_in_reloc (sym); | |
696 | } | |
697 | if (sym == NULL) | |
698 | { | |
699 | if (abs_section_sym == NULL) | |
700 | abs_section_sym = section_symbol (absolute_section); | |
701 | sym = abs_section_sym; | |
702 | } | |
703 | ||
704 | howto = r->u.a.howto; | |
705 | ||
706 | r->u.b.sec = sec; | |
707 | r->u.b.s = symbol_get_bfdsym (sym); | |
708 | r->u.b.r.sym_ptr_ptr = &r->u.b.s; | |
709 | r->u.b.r.address = offset; | |
710 | r->u.b.r.addend = addend; | |
711 | r->u.b.r.howto = howto; | |
712 | } | |
713 | } | |
714 | ||
df44284e AM |
715 | /* This pass over fixups decides whether symbols can be replaced with |
716 | section symbols. */ | |
717 | ||
252b5132 | 718 | static void |
d7342424 KH |
719 | adjust_reloc_syms (bfd *abfd ATTRIBUTE_UNUSED, |
720 | asection *sec, | |
e7ff5c73 | 721 | void *xxx ATTRIBUTE_UNUSED) |
252b5132 RH |
722 | { |
723 | segment_info_type *seginfo = seg_info (sec); | |
724 | fixS *fixp; | |
725 | ||
726 | if (seginfo == NULL) | |
727 | return; | |
728 | ||
729 | dump_section_relocs (abfd, sec, stderr); | |
730 | ||
731 | for (fixp = seginfo->fix_root; fixp; fixp = fixp->fx_next) | |
732 | if (fixp->fx_done) | |
efaf0ba4 NC |
733 | /* Ignore it. */ |
734 | ; | |
252b5132 RH |
735 | else if (fixp->fx_addsy) |
736 | { | |
737 | symbolS *sym; | |
738 | asection *symsec; | |
739 | ||
740 | #ifdef DEBUG5 | |
741 | fprintf (stderr, "\n\nadjusting fixup:\n"); | |
742 | print_fixup (fixp); | |
743 | #endif | |
744 | ||
745 | sym = fixp->fx_addsy; | |
746 | ||
747 | /* All symbols should have already been resolved at this | |
748 | point. It is possible to see unresolved expression | |
749 | symbols, though, since they are not in the regular symbol | |
750 | table. */ | |
df44284e | 751 | resolve_symbol_value (sym); |
efaf0ba4 | 752 | |
49309057 | 753 | if (fixp->fx_subsy != NULL) |
6386f3a7 | 754 | resolve_symbol_value (fixp->fx_subsy); |
252b5132 | 755 | |
60938e80 L |
756 | /* If this symbol is equated to an undefined or common symbol, |
757 | convert the fixup to being against that symbol. */ | |
b4b24b79 AM |
758 | while (symbol_equated_reloc_p (sym) |
759 | || S_IS_WEAKREFR (sym)) | |
252b5132 | 760 | { |
b4b24b79 AM |
761 | symbolS *newsym = symbol_get_value_expression (sym)->X_add_symbol; |
762 | if (sym == newsym) | |
763 | break; | |
49309057 | 764 | fixp->fx_offset += symbol_get_value_expression (sym)->X_add_number; |
b4b24b79 AM |
765 | fixp->fx_addsy = newsym; |
766 | sym = newsym; | |
252b5132 RH |
767 | } |
768 | ||
df44284e | 769 | if (symbol_mri_common_p (sym)) |
252b5132 | 770 | { |
b4b24b79 AM |
771 | fixp->fx_offset += S_GET_VALUE (sym); |
772 | fixp->fx_addsy = symbol_get_value_expression (sym)->X_add_symbol; | |
df44284e | 773 | continue; |
252b5132 RH |
774 | } |
775 | ||
a161fe53 AM |
776 | /* If the symbol is undefined, common, weak, or global (ELF |
777 | shared libs), we can't replace it with the section symbol. */ | |
ae6063d4 | 778 | if (S_FORCE_RELOC (fixp->fx_addsy, 1)) |
a161fe53 AM |
779 | continue; |
780 | ||
781 | /* Is there some other (target cpu dependent) reason we can't adjust | |
782 | this one? (E.g. relocations involving function addresses on | |
783 | the PA. */ | |
784 | #ifdef tc_fix_adjustable | |
785 | if (! tc_fix_adjustable (fixp)) | |
786 | continue; | |
787 | #endif | |
788 | ||
789 | /* Since we're reducing to section symbols, don't attempt to reduce | |
790 | anything that's already using one. */ | |
791 | if (symbol_section_p (sym)) | |
792 | continue; | |
793 | ||
252b5132 | 794 | symsec = S_GET_SEGMENT (sym); |
252b5132 RH |
795 | if (symsec == NULL) |
796 | abort (); | |
efaf0ba4 | 797 | |
252b5132 RH |
798 | if (bfd_is_abs_section (symsec)) |
799 | { | |
a161fe53 | 800 | /* The fixup_segment routine normally will not use this |
b4b24b79 | 801 | symbol in a relocation. */ |
df44284e | 802 | continue; |
252b5132 RH |
803 | } |
804 | ||
7565ed77 | 805 | /* Don't try to reduce relocs which refer to non-local symbols |
b4b24b79 AM |
806 | in .linkonce sections. It can lead to confusion when a |
807 | debugging section refers to a .linkonce section. I hope | |
808 | this will always be correct. */ | |
7565ed77 | 809 | if (symsec != sec && ! S_IS_LOCAL (sym)) |
252b5132 | 810 | { |
a161fe53 AM |
811 | if ((symsec->flags & SEC_LINK_ONCE) != 0 |
812 | || (IS_ELF | |
813 | /* The GNU toolchain uses an extension for ELF: a | |
814 | section beginning with the magic string | |
815 | .gnu.linkonce is a linkonce section. */ | |
816 | && strncmp (segment_name (symsec), ".gnu.linkonce", | |
817 | sizeof ".gnu.linkonce" - 1) == 0)) | |
818 | continue; | |
252b5132 | 819 | } |
f7460f5f JJ |
820 | |
821 | /* Never adjust a reloc against local symbol in a merge section | |
822 | with non-zero addend. */ | |
5045ec7a AM |
823 | if ((symsec->flags & SEC_MERGE) != 0 |
824 | && (fixp->fx_offset != 0 || fixp->fx_subsy != NULL)) | |
a161fe53 | 825 | continue; |
13ae64f3 JJ |
826 | |
827 | /* Never adjust a reloc against TLS local symbol. */ | |
df44284e | 828 | if ((symsec->flags & SEC_THREAD_LOCAL) != 0) |
a161fe53 | 829 | continue; |
252b5132 | 830 | |
a161fe53 | 831 | /* We refetch the segment when calling section_symbol, rather |
252b5132 | 832 | than using symsec, because S_GET_VALUE may wind up changing |
efaf0ba4 | 833 | the section when it calls resolve_symbol_value. */ |
252b5132 RH |
834 | fixp->fx_offset += S_GET_VALUE (sym); |
835 | fixp->fx_addsy = section_symbol (S_GET_SEGMENT (sym)); | |
e723ef7c ILT |
836 | #ifdef DEBUG5 |
837 | fprintf (stderr, "\nadjusted fixup:\n"); | |
838 | print_fixup (fixp); | |
839 | #endif | |
252b5132 | 840 | } |
252b5132 RH |
841 | |
842 | dump_section_relocs (abfd, sec, stderr); | |
843 | } | |
844 | ||
e7ff5c73 AM |
845 | /* fixup_segment() |
846 | ||
847 | Go through all the fixS's in a segment and see which ones can be | |
848 | handled now. (These consist of fixS where we have since discovered | |
849 | the value of a symbol, or the address of the frag involved.) | |
850 | For each one, call md_apply_fix to put the fix into the frag data. | |
851 | ||
852 | Result is a count of how many relocation structs will be needed to | |
853 | handle the remaining fixS's that we couldn't completely handle here. | |
854 | These will be output later by emit_relocations(). */ | |
855 | ||
856 | static long | |
857 | fixup_segment (fixS *fixP, segT this_segment) | |
858 | { | |
859 | long seg_reloc_count = 0; | |
860 | valueT add_number; | |
861 | fragS *fragP; | |
862 | segT add_symbol_segment = absolute_section; | |
863 | ||
864 | if (fixP != NULL && abs_section_sym == NULL) | |
865 | abs_section_sym = section_symbol (absolute_section); | |
866 | ||
867 | /* If the linker is doing the relaxing, we must not do any fixups. | |
868 | ||
869 | Well, strictly speaking that's not true -- we could do any that | |
870 | are PC-relative and don't cross regions that could change size. | |
871 | And for the i960 we might be able to turn callx/callj into bal | |
872 | anyways in cases where we know the maximum displacement. */ | |
873 | if (linkrelax && TC_LINKRELAX_FIXUP (this_segment)) | |
874 | { | |
875 | for (; fixP; fixP = fixP->fx_next) | |
876 | if (!fixP->fx_done) | |
877 | { | |
878 | if (fixP->fx_addsy == NULL) | |
879 | { | |
880 | /* There was no symbol required by this relocation. | |
881 | However, BFD doesn't really handle relocations | |
882 | without symbols well. So fake up a local symbol in | |
883 | the absolute section. */ | |
884 | fixP->fx_addsy = abs_section_sym; | |
885 | } | |
886 | symbol_mark_used_in_reloc (fixP->fx_addsy); | |
887 | if (fixP->fx_subsy != NULL) | |
888 | symbol_mark_used_in_reloc (fixP->fx_subsy); | |
889 | seg_reloc_count++; | |
890 | } | |
891 | TC_ADJUST_RELOC_COUNT (fixP, seg_reloc_count); | |
892 | return seg_reloc_count; | |
893 | } | |
894 | ||
895 | for (; fixP; fixP = fixP->fx_next) | |
896 | { | |
897 | #ifdef DEBUG5 | |
898 | fprintf (stderr, "\nprocessing fixup:\n"); | |
899 | print_fixup (fixP); | |
900 | #endif | |
901 | ||
902 | fragP = fixP->fx_frag; | |
903 | know (fragP); | |
904 | #ifdef TC_VALIDATE_FIX | |
905 | TC_VALIDATE_FIX (fixP, this_segment, skip); | |
906 | #endif | |
907 | add_number = fixP->fx_offset; | |
908 | ||
e7ff5c73 AM |
909 | if (fixP->fx_addsy != NULL) |
910 | add_symbol_segment = S_GET_SEGMENT (fixP->fx_addsy); | |
911 | ||
912 | if (fixP->fx_subsy != NULL) | |
913 | { | |
914 | segT sub_symbol_segment; | |
915 | resolve_symbol_value (fixP->fx_subsy); | |
916 | sub_symbol_segment = S_GET_SEGMENT (fixP->fx_subsy); | |
917 | if (fixP->fx_addsy != NULL | |
918 | && sub_symbol_segment == add_symbol_segment | |
919 | && !TC_FORCE_RELOCATION_SUB_SAME (fixP, add_symbol_segment)) | |
920 | { | |
921 | add_number += S_GET_VALUE (fixP->fx_addsy); | |
922 | add_number -= S_GET_VALUE (fixP->fx_subsy); | |
923 | fixP->fx_offset = add_number; | |
924 | fixP->fx_addsy = NULL; | |
925 | fixP->fx_subsy = NULL; | |
926 | #ifdef TC_M68K | |
927 | /* See the comment below about 68k weirdness. */ | |
928 | fixP->fx_pcrel = 0; | |
929 | #endif | |
930 | } | |
931 | else if (sub_symbol_segment == absolute_section | |
9a97a5d7 | 932 | && !TC_FORCE_RELOCATION_SUB_ABS (fixP, add_symbol_segment)) |
e7ff5c73 AM |
933 | { |
934 | add_number -= S_GET_VALUE (fixP->fx_subsy); | |
935 | fixP->fx_offset = add_number; | |
936 | fixP->fx_subsy = NULL; | |
937 | } | |
938 | else if (sub_symbol_segment == this_segment | |
939 | && !TC_FORCE_RELOCATION_SUB_LOCAL (fixP)) | |
940 | { | |
941 | add_number -= S_GET_VALUE (fixP->fx_subsy); | |
942 | fixP->fx_offset = (add_number + fixP->fx_dot_value | |
943 | + fixP->fx_frag->fr_address); | |
944 | ||
945 | /* Make it pc-relative. If the back-end code has not | |
946 | selected a pc-relative reloc, cancel the adjustment | |
947 | we do later on all pc-relative relocs. */ | |
948 | if (0 | |
949 | #ifdef TC_M68K | |
950 | /* Do this for m68k even if it's already described | |
951 | as pc-relative. On the m68k, an operand of | |
952 | "pc@(foo-.-2)" should address "foo" in a | |
953 | pc-relative mode. */ | |
954 | || 1 | |
955 | #endif | |
956 | || !fixP->fx_pcrel) | |
957 | add_number += MD_PCREL_FROM_SECTION (fixP, this_segment); | |
958 | fixP->fx_subsy = NULL; | |
959 | fixP->fx_pcrel = 1; | |
960 | } | |
961 | else if (!TC_VALIDATE_FIX_SUB (fixP)) | |
962 | { | |
9a97a5d7 AM |
963 | if (!md_register_arithmetic |
964 | && (add_symbol_segment == reg_section | |
965 | || sub_symbol_segment == reg_section)) | |
966 | as_bad_where (fixP->fx_file, fixP->fx_line, | |
967 | _("register value used as expression")); | |
968 | else | |
969 | as_bad_where (fixP->fx_file, fixP->fx_line, | |
970 | _("can't resolve `%s' {%s section} - `%s' {%s section}"), | |
971 | fixP->fx_addsy ? S_GET_NAME (fixP->fx_addsy) : "0", | |
972 | segment_name (add_symbol_segment), | |
973 | S_GET_NAME (fixP->fx_subsy), | |
974 | segment_name (sub_symbol_segment)); | |
e7ff5c73 AM |
975 | } |
976 | } | |
977 | ||
978 | if (fixP->fx_addsy) | |
979 | { | |
980 | if (add_symbol_segment == this_segment | |
981 | && !TC_FORCE_RELOCATION_LOCAL (fixP)) | |
982 | { | |
983 | /* This fixup was made when the symbol's segment was | |
984 | SEG_UNKNOWN, but it is now in the local segment. | |
985 | So we know how to do the address without relocation. */ | |
986 | add_number += S_GET_VALUE (fixP->fx_addsy); | |
987 | fixP->fx_offset = add_number; | |
988 | if (fixP->fx_pcrel) | |
989 | add_number -= MD_PCREL_FROM_SECTION (fixP, this_segment); | |
990 | fixP->fx_addsy = NULL; | |
991 | fixP->fx_pcrel = 0; | |
992 | } | |
993 | else if (add_symbol_segment == absolute_section | |
994 | && !TC_FORCE_RELOCATION_ABS (fixP)) | |
995 | { | |
996 | add_number += S_GET_VALUE (fixP->fx_addsy); | |
997 | fixP->fx_offset = add_number; | |
998 | fixP->fx_addsy = NULL; | |
999 | } | |
1000 | else if (add_symbol_segment != undefined_section | |
1001 | && ! bfd_is_com_section (add_symbol_segment) | |
1002 | && MD_APPLY_SYM_VALUE (fixP)) | |
1003 | add_number += S_GET_VALUE (fixP->fx_addsy); | |
1004 | } | |
1005 | ||
1006 | if (fixP->fx_pcrel) | |
1007 | { | |
1008 | add_number -= MD_PCREL_FROM_SECTION (fixP, this_segment); | |
1009 | if (!fixP->fx_done && fixP->fx_addsy == NULL) | |
1010 | { | |
1011 | /* There was no symbol required by this relocation. | |
1012 | However, BFD doesn't really handle relocations | |
1013 | without symbols well. So fake up a local symbol in | |
1014 | the absolute section. */ | |
1015 | fixP->fx_addsy = abs_section_sym; | |
1016 | } | |
1017 | } | |
1018 | ||
1019 | if (!fixP->fx_done) | |
1020 | md_apply_fix (fixP, &add_number, this_segment); | |
1021 | ||
1022 | if (!fixP->fx_done) | |
1023 | { | |
1024 | ++seg_reloc_count; | |
1025 | if (fixP->fx_addsy == NULL) | |
1026 | fixP->fx_addsy = abs_section_sym; | |
1027 | symbol_mark_used_in_reloc (fixP->fx_addsy); | |
1028 | if (fixP->fx_subsy != NULL) | |
1029 | symbol_mark_used_in_reloc (fixP->fx_subsy); | |
1030 | } | |
1031 | ||
1032 | if (!fixP->fx_bit_fixP && !fixP->fx_no_overflow && fixP->fx_size != 0) | |
1033 | { | |
1034 | if (fixP->fx_size < sizeof (valueT)) | |
1035 | { | |
1036 | valueT mask; | |
1037 | ||
1038 | mask = 0; | |
1039 | mask--; /* Set all bits to one. */ | |
1040 | mask <<= fixP->fx_size * 8 - (fixP->fx_signed ? 1 : 0); | |
1041 | if ((add_number & mask) != 0 && (add_number & mask) != mask) | |
1042 | { | |
1043 | char buf[50], buf2[50]; | |
1044 | sprint_value (buf, fragP->fr_address + fixP->fx_where); | |
1045 | if (add_number > 1000) | |
1046 | sprint_value (buf2, add_number); | |
1047 | else | |
1048 | sprintf (buf2, "%ld", (long) add_number); | |
1049 | as_bad_where (fixP->fx_file, fixP->fx_line, | |
1050 | _("value of %s too large for field of %d bytes at %s"), | |
1051 | buf2, fixP->fx_size, buf); | |
1052 | } /* Generic error checking. */ | |
1053 | } | |
1054 | #ifdef WARN_SIGNED_OVERFLOW_WORD | |
1055 | /* Warn if a .word value is too large when treated as a signed | |
1056 | number. We already know it is not too negative. This is to | |
1057 | catch over-large switches generated by gcc on the 68k. */ | |
1058 | if (!flag_signed_overflow_ok | |
1059 | && fixP->fx_size == 2 | |
1060 | && add_number > 0x7fff) | |
1061 | as_bad_where (fixP->fx_file, fixP->fx_line, | |
1062 | _("signed .word overflow; switch may be too large; %ld at 0x%lx"), | |
1063 | (long) add_number, | |
1064 | (long) (fragP->fr_address + fixP->fx_where)); | |
1065 | #endif | |
1066 | } /* Not a bit fix. */ | |
1067 | ||
1068 | #ifdef TC_VALIDATE_FIX | |
1069 | skip: ATTRIBUTE_UNUSED_LABEL | |
1070 | ; | |
1071 | #endif | |
1072 | #ifdef DEBUG5 | |
1073 | fprintf (stderr, "result:\n"); | |
1074 | print_fixup (fixP); | |
1075 | #endif | |
1076 | } /* For each fixS in this segment. */ | |
1077 | ||
1078 | TC_ADJUST_RELOC_COUNT (fixP, seg_reloc_count); | |
1079 | return seg_reloc_count; | |
1080 | } | |
1081 | ||
a161fe53 | 1082 | static void |
d7342424 KH |
1083 | fix_segment (bfd *abfd ATTRIBUTE_UNUSED, |
1084 | asection *sec, | |
e7ff5c73 | 1085 | void *xxx ATTRIBUTE_UNUSED) |
a161fe53 AM |
1086 | { |
1087 | segment_info_type *seginfo = seg_info (sec); | |
1088 | ||
1089 | fixup_segment (seginfo->fix_root, sec); | |
1090 | } | |
1091 | ||
e5435dec AM |
1092 | static void |
1093 | install_reloc (asection *sec, arelent *reloc, fragS *fragp, | |
1094 | char *file, unsigned int line) | |
1095 | { | |
1096 | char *err; | |
1097 | bfd_reloc_status_type s; | |
76d12939 AM |
1098 | asymbol *sym; |
1099 | ||
1100 | if (reloc->sym_ptr_ptr != NULL | |
1101 | && (sym = *reloc->sym_ptr_ptr) != NULL | |
1102 | && (sym->flags & BSF_KEEP) == 0 | |
1103 | && ((sym->flags & BSF_SECTION_SYM) == 0 | |
55f8b826 AM |
1104 | || (EMIT_SECTION_SYMBOLS |
1105 | && !bfd_is_abs_section (sym->section)))) | |
76d12939 | 1106 | as_bad_where (file, line, _("redefined symbol cannot be used on reloc")); |
e5435dec AM |
1107 | |
1108 | s = bfd_install_relocation (stdoutput, reloc, | |
1109 | fragp->fr_literal, fragp->fr_address, | |
1110 | sec, &err); | |
1111 | switch (s) | |
1112 | { | |
1113 | case bfd_reloc_ok: | |
1114 | break; | |
1115 | case bfd_reloc_overflow: | |
1116 | as_bad_where (file, line, _("relocation overflow")); | |
1117 | break; | |
1118 | case bfd_reloc_outofrange: | |
1119 | as_bad_where (file, line, _("relocation out of range")); | |
1120 | break; | |
1121 | default: | |
1122 | as_fatal (_("%s:%u: bad return from bfd_install_relocation: %x"), | |
1123 | file, line, s); | |
1124 | } | |
1125 | } | |
1126 | ||
252b5132 | 1127 | static void |
e7ff5c73 | 1128 | write_relocs (bfd *abfd, asection *sec, void *xxx ATTRIBUTE_UNUSED) |
252b5132 RH |
1129 | { |
1130 | segment_info_type *seginfo = seg_info (sec); | |
927781e2 | 1131 | unsigned int i; |
252b5132 | 1132 | unsigned int n; |
05e9452c | 1133 | struct reloc_list *my_reloc_list, **rp, *r; |
252b5132 RH |
1134 | arelent **relocs; |
1135 | fixS *fixp; | |
252b5132 RH |
1136 | |
1137 | /* If seginfo is NULL, we did not create this section; don't do | |
1138 | anything with it. */ | |
1139 | if (seginfo == NULL) | |
1140 | return; | |
1141 | ||
252b5132 RH |
1142 | n = 0; |
1143 | for (fixp = seginfo->fix_root; fixp; fixp = fixp->fx_next) | |
e5435dec AM |
1144 | if (!fixp->fx_done) |
1145 | n++; | |
1146 | ||
1147 | #ifdef RELOC_EXPANSION_POSSIBLE | |
1148 | n *= MAX_RELOC_EXPANSION; | |
1149 | #endif | |
252b5132 | 1150 | |
05e9452c AM |
1151 | /* Extract relocs for this section from reloc_list. */ |
1152 | rp = &reloc_list; | |
1153 | my_reloc_list = NULL; | |
1154 | while ((r = *rp) != NULL) | |
1155 | { | |
1156 | if (r->u.b.sec == sec) | |
1157 | { | |
1158 | *rp = r->next; | |
1159 | r->next = my_reloc_list; | |
1160 | my_reloc_list = r; | |
1161 | n++; | |
1162 | } | |
1163 | else | |
1164 | rp = &r->next; | |
1165 | } | |
1166 | ||
e7ff5c73 | 1167 | relocs = xcalloc (n, sizeof (arelent *)); |
252b5132 RH |
1168 | |
1169 | i = 0; | |
1170 | for (fixp = seginfo->fix_root; fixp != (fixS *) NULL; fixp = fixp->fx_next) | |
1171 | { | |
e5435dec | 1172 | int j; |
d31f0f6d AM |
1173 | int fx_size, slack; |
1174 | offsetT loc; | |
252b5132 RH |
1175 | |
1176 | if (fixp->fx_done) | |
e5435dec | 1177 | continue; |
252b5132 | 1178 | |
d31f0f6d AM |
1179 | fx_size = fixp->fx_size; |
1180 | slack = TC_FX_SIZE_SLACK (fixp); | |
1181 | if (slack > 0) | |
1182 | fx_size = fx_size > slack ? fx_size - slack : 0; | |
1183 | loc = fixp->fx_where + fx_size; | |
e5435dec | 1184 | if (slack >= 0 && loc > fixp->fx_frag->fr_fix) |
d31f0f6d AM |
1185 | as_bad_where (fixp->fx_file, fixp->fx_line, |
1186 | _("internal error: fixup not contained within frag")); | |
252b5132 | 1187 | |
e5435dec AM |
1188 | #ifndef RELOC_EXPANSION_POSSIBLE |
1189 | { | |
1190 | arelent *reloc = tc_gen_reloc (sec, fixp); | |
252b5132 | 1191 | |
e5435dec | 1192 | if (!reloc) |
252b5132 | 1193 | continue; |
e5435dec AM |
1194 | relocs[i++] = reloc; |
1195 | j = 1; | |
1196 | } | |
1197 | #else | |
1198 | { | |
1199 | arelent **reloc = tc_gen_reloc (sec, fixp); | |
252b5132 | 1200 | |
e5435dec | 1201 | for (j = 0; reloc[j]; j++) |
efaf0ba4 | 1202 | relocs[i++] = reloc[j]; |
e5435dec AM |
1203 | } |
1204 | #endif | |
d31f0f6d | 1205 | |
e5435dec AM |
1206 | for ( ; j != 0; --j) |
1207 | install_reloc (sec, relocs[i - j], fixp->fx_frag, | |
1208 | fixp->fx_file, fixp->fx_line); | |
252b5132 RH |
1209 | } |
1210 | n = i; | |
252b5132 RH |
1211 | |
1212 | #ifdef DEBUG4 | |
1213 | { | |
988392e2 | 1214 | unsigned int i, j, nsyms; |
252b5132 RH |
1215 | asymbol **sympp; |
1216 | sympp = bfd_get_outsymbols (stdoutput); | |
1217 | nsyms = bfd_get_symcount (stdoutput); | |
1218 | for (i = 0; i < n; i++) | |
1219 | if (((*relocs[i]->sym_ptr_ptr)->flags & BSF_SECTION_SYM) == 0) | |
1220 | { | |
1221 | for (j = 0; j < nsyms; j++) | |
1222 | if (sympp[j] == *relocs[i]->sym_ptr_ptr) | |
1223 | break; | |
1224 | if (j == nsyms) | |
1225 | abort (); | |
1226 | } | |
1227 | } | |
1228 | #endif | |
1229 | ||
05e9452c AM |
1230 | for (r = my_reloc_list; r != NULL; r = r->next) |
1231 | { | |
1232 | fragS *f; | |
1233 | for (f = seginfo->frchainP->frch_root; f; f = f->fr_next) | |
1234 | if (f->fr_address <= r->u.b.r.address | |
1235 | && r->u.b.r.address < f->fr_address + f->fr_fix) | |
1236 | break; | |
1237 | if (f == NULL) | |
1238 | as_bad_where (r->file, r->line, | |
1239 | _("reloc not within (fixed part of) section")); | |
1240 | else | |
1241 | { | |
1242 | relocs[n++] = &r->u.b.r; | |
1243 | install_reloc (sec, &r->u.b.r, f, r->file, r->line); | |
1244 | } | |
1245 | } | |
1246 | ||
252b5132 | 1247 | if (n) |
e5435dec AM |
1248 | { |
1249 | flagword flags = bfd_get_section_flags (abfd, sec); | |
1250 | flags |= SEC_RELOC; | |
1251 | bfd_set_section_flags (abfd, sec, flags); | |
1252 | bfd_set_reloc (stdoutput, sec, relocs, n); | |
1253 | } | |
252b5132 | 1254 | |
945a1a6b ILT |
1255 | #ifdef SET_SECTION_RELOCS |
1256 | SET_SECTION_RELOCS (sec, relocs, n); | |
1257 | #endif | |
1258 | ||
252b5132 RH |
1259 | #ifdef DEBUG3 |
1260 | { | |
988392e2 | 1261 | unsigned int i; |
252b5132 RH |
1262 | arelent *r; |
1263 | asymbol *s; | |
1264 | fprintf (stderr, "relocs for sec %s\n", sec->name); | |
1265 | for (i = 0; i < n; i++) | |
1266 | { | |
1267 | r = relocs[i]; | |
1268 | s = *r->sym_ptr_ptr; | |
988392e2 CG |
1269 | fprintf (stderr, " reloc %2d @%p off %4lx : sym %-10s addend %lx\n", |
1270 | i, r, (unsigned long)r->address, s->name, (unsigned long)r->addend); | |
252b5132 RH |
1271 | } |
1272 | } | |
1273 | #endif | |
1274 | } | |
1275 | ||
1276 | static void | |
d7342424 KH |
1277 | write_contents (bfd *abfd ATTRIBUTE_UNUSED, |
1278 | asection *sec, | |
e7ff5c73 | 1279 | void *xxx ATTRIBUTE_UNUSED) |
252b5132 RH |
1280 | { |
1281 | segment_info_type *seginfo = seg_info (sec); | |
685736be | 1282 | addressT offset = 0; |
252b5132 RH |
1283 | fragS *f; |
1284 | ||
1285 | /* Write out the frags. */ | |
1286 | if (seginfo == NULL | |
efaf0ba4 | 1287 | || !(bfd_get_section_flags (abfd, sec) & SEC_HAS_CONTENTS)) |
252b5132 RH |
1288 | return; |
1289 | ||
1290 | for (f = seginfo->frchainP->frch_root; | |
1291 | f; | |
1292 | f = f->fr_next) | |
1293 | { | |
1294 | int x; | |
685736be | 1295 | addressT fill_size; |
252b5132 | 1296 | char *fill_literal; |
685736be | 1297 | offsetT count; |
252b5132 RH |
1298 | |
1299 | assert (f->fr_type == rs_fill); | |
1300 | if (f->fr_fix) | |
1301 | { | |
1302 | x = bfd_set_section_contents (stdoutput, sec, | |
1303 | f->fr_literal, (file_ptr) offset, | |
1304 | (bfd_size_type) f->fr_fix); | |
b34976b6 | 1305 | if (!x) |
885afe7b AM |
1306 | as_fatal (_("can't write %s: %s"), stdoutput->filename, |
1307 | bfd_errmsg (bfd_get_error ())); | |
252b5132 RH |
1308 | offset += f->fr_fix; |
1309 | } | |
1310 | fill_literal = f->fr_literal + f->fr_fix; | |
1311 | fill_size = f->fr_var; | |
1312 | count = f->fr_offset; | |
1313 | assert (count >= 0); | |
1314 | if (fill_size && count) | |
1315 | { | |
1316 | char buf[256]; | |
efaf0ba4 | 1317 | if (fill_size > sizeof (buf)) |
252b5132 | 1318 | { |
efaf0ba4 | 1319 | /* Do it the old way. Can this ever happen? */ |
252b5132 RH |
1320 | while (count--) |
1321 | { | |
1322 | x = bfd_set_section_contents (stdoutput, sec, | |
1323 | fill_literal, | |
1324 | (file_ptr) offset, | |
1325 | (bfd_size_type) fill_size); | |
b34976b6 | 1326 | if (!x) |
885afe7b AM |
1327 | as_fatal (_("can't write %s: %s"), stdoutput->filename, |
1328 | bfd_errmsg (bfd_get_error ())); | |
252b5132 RH |
1329 | offset += fill_size; |
1330 | } | |
1331 | } | |
1332 | else | |
1333 | { | |
1334 | /* Build a buffer full of fill objects and output it as | |
1335 | often as necessary. This saves on the overhead of | |
1336 | potentially lots of bfd_set_section_contents calls. */ | |
1337 | int n_per_buf, i; | |
1338 | if (fill_size == 1) | |
1339 | { | |
1340 | n_per_buf = sizeof (buf); | |
1341 | memset (buf, *fill_literal, n_per_buf); | |
1342 | } | |
1343 | else | |
1344 | { | |
1345 | char *bufp; | |
efaf0ba4 | 1346 | n_per_buf = sizeof (buf) / fill_size; |
252b5132 | 1347 | for (i = n_per_buf, bufp = buf; i; i--, bufp += fill_size) |
efaf0ba4 | 1348 | memcpy (bufp, fill_literal, fill_size); |
252b5132 RH |
1349 | } |
1350 | for (; count > 0; count -= n_per_buf) | |
1351 | { | |
1352 | n_per_buf = n_per_buf > count ? count : n_per_buf; | |
efaf0ba4 NC |
1353 | x = bfd_set_section_contents |
1354 | (stdoutput, sec, buf, (file_ptr) offset, | |
1355 | (bfd_size_type) n_per_buf * fill_size); | |
b34976b6 | 1356 | if (!x) |
0e389e77 | 1357 | as_fatal (_("cannot write to output file")); |
252b5132 RH |
1358 | offset += n_per_buf * fill_size; |
1359 | } | |
1360 | } | |
1361 | } | |
1362 | } | |
1363 | } | |
252b5132 | 1364 | |
252b5132 | 1365 | static void |
d7342424 | 1366 | merge_data_into_text (void) |
252b5132 | 1367 | { |
252b5132 RH |
1368 | seg_info (text_section)->frchainP->frch_last->fr_next = |
1369 | seg_info (data_section)->frchainP->frch_root; | |
1370 | seg_info (text_section)->frchainP->frch_last = | |
1371 | seg_info (data_section)->frchainP->frch_last; | |
1372 | seg_info (data_section)->frchainP = 0; | |
252b5132 | 1373 | } |
252b5132 | 1374 | |
252b5132 | 1375 | static void |
d7342424 | 1376 | set_symtab (void) |
252b5132 RH |
1377 | { |
1378 | int nsyms; | |
1379 | asymbol **asympp; | |
1380 | symbolS *symp; | |
b34976b6 | 1381 | bfd_boolean result; |
252b5132 RH |
1382 | |
1383 | /* Count symbols. We can't rely on a count made by the loop in | |
1384 | write_object_file, because *_frob_file may add a new symbol or | |
1385 | two. */ | |
1386 | nsyms = 0; | |
1387 | for (symp = symbol_rootP; symp; symp = symbol_next (symp)) | |
1388 | nsyms++; | |
1389 | ||
1390 | if (nsyms) | |
1391 | { | |
1392 | int i; | |
0e1a166b | 1393 | bfd_size_type amt = (bfd_size_type) nsyms * sizeof (asymbol *); |
252b5132 | 1394 | |
e7ff5c73 | 1395 | asympp = bfd_alloc (stdoutput, amt); |
252b5132 RH |
1396 | symp = symbol_rootP; |
1397 | for (i = 0; i < nsyms; i++, symp = symbol_next (symp)) | |
1398 | { | |
49309057 | 1399 | asympp[i] = symbol_get_bfdsym (symp); |
76d12939 AM |
1400 | if (asympp[i]->flags != BSF_SECTION_SYM |
1401 | || !(bfd_is_const_section (asympp[i]->section) | |
1402 | && asympp[i]->section->symbol == asympp[i])) | |
1403 | asympp[i]->flags |= BSF_KEEP; | |
49309057 | 1404 | symbol_mark_written (symp); |
252b5132 RH |
1405 | } |
1406 | } | |
1407 | else | |
1408 | asympp = 0; | |
1409 | result = bfd_set_symtab (stdoutput, asympp, nsyms); | |
b34976b6 | 1410 | assert (result); |
252b5132 RH |
1411 | symbol_table_frozen = 1; |
1412 | } | |
252b5132 RH |
1413 | |
1414 | /* Finish the subsegments. After every sub-segment, we fake an | |
1415 | ".align ...". This conforms to BSD4.2 brane-damage. We then fake | |
1416 | ".fill 0" because that is the kind of frag that requires least | |
1417 | thought. ".align" frags like to have a following frag since that | |
1418 | makes calculating their intended length trivial. */ | |
1419 | ||
1420 | #ifndef SUB_SEGMENT_ALIGN | |
18e1d487 | 1421 | #ifdef HANDLE_ALIGN |
436d9e46 | 1422 | /* The last subsegment gets an alignment corresponding to the alignment |
18e1d487 AM |
1423 | of the section. This allows proper nop-filling at the end of |
1424 | code-bearing sections. */ | |
1425 | #define SUB_SEGMENT_ALIGN(SEG, FRCHAIN) \ | |
c9049d30 | 1426 | (!(FRCHAIN)->frch_next ? get_recorded_alignment (SEG) : 0) |
18e1d487 | 1427 | #else |
18e1d487 | 1428 | #define SUB_SEGMENT_ALIGN(SEG, FRCHAIN) 0 |
252b5132 RH |
1429 | #endif |
1430 | #endif | |
1431 | ||
1432 | void | |
d7342424 | 1433 | subsegs_finish (void) |
252b5132 RH |
1434 | { |
1435 | struct frchain *frchainP; | |
c9049d30 | 1436 | asection *s; |
252b5132 | 1437 | |
c9049d30 | 1438 | for (s = stdoutput->sections; s; s = s->next) |
252b5132 | 1439 | { |
c9049d30 AM |
1440 | segment_info_type *seginfo = seg_info (s); |
1441 | if (!seginfo) | |
1442 | continue; | |
0a9ef439 | 1443 | |
c9049d30 AM |
1444 | for (frchainP = seginfo->frchainP; |
1445 | frchainP != NULL; | |
1446 | frchainP = frchainP->frch_next) | |
381a1ab3 | 1447 | { |
c9049d30 AM |
1448 | int alignment = 0; |
1449 | ||
1450 | subseg_set (s, frchainP->frch_subseg); | |
381a1ab3 | 1451 | |
c9049d30 AM |
1452 | /* This now gets called even if we had errors. In that case, |
1453 | any alignment is meaningless, and, moreover, will look weird | |
1454 | if we are generating a listing. */ | |
1455 | if (!had_errors ()) | |
1456 | { | |
1457 | alignment = SUB_SEGMENT_ALIGN (now_seg, frchainP); | |
1458 | if ((bfd_get_section_flags (now_seg->owner, now_seg) & SEC_MERGE) | |
1459 | && now_seg->entsize) | |
381a1ab3 | 1460 | { |
c9049d30 AM |
1461 | unsigned int entsize = now_seg->entsize; |
1462 | int entalign = 0; | |
1463 | ||
1464 | while ((entsize & 1) == 0) | |
1465 | { | |
1466 | ++entalign; | |
1467 | entsize >>= 1; | |
1468 | } | |
1469 | if (entalign > alignment) | |
1470 | alignment = entalign; | |
381a1ab3 | 1471 | } |
381a1ab3 | 1472 | } |
0a9ef439 | 1473 | |
c9049d30 AM |
1474 | if (subseg_text_p (now_seg)) |
1475 | frag_align_code (alignment, 0); | |
1476 | else | |
1477 | frag_align (alignment, 0, 0); | |
252b5132 | 1478 | |
c9049d30 AM |
1479 | /* frag_align will have left a new frag. |
1480 | Use this last frag for an empty ".fill". | |
252b5132 | 1481 | |
c9049d30 AM |
1482 | For this segment ... |
1483 | Create a last frag. Do not leave a "being filled in frag". */ | |
1484 | frag_wane (frag_now); | |
1485 | frag_now->fr_fix = 0; | |
1486 | know (frag_now->fr_next == NULL); | |
1487 | } | |
252b5132 RH |
1488 | } |
1489 | } | |
1490 | ||
1491 | /* Write the object file. */ | |
1492 | ||
1493 | void | |
d7342424 | 1494 | write_object_file (void) |
252b5132 | 1495 | { |
32638454 | 1496 | struct relax_seg_info rsi; |
7be1c489 | 1497 | #ifndef WORKING_DOT_WORD |
efaf0ba4 | 1498 | fragS *fragP; /* Track along all frags. */ |
252b5132 RH |
1499 | #endif |
1500 | ||
1501 | /* Do we really want to write it? */ | |
1502 | { | |
1503 | int n_warns, n_errs; | |
1504 | n_warns = had_warnings (); | |
1505 | n_errs = had_errors (); | |
1506 | /* The -Z flag indicates that an object file should be generated, | |
1507 | regardless of warnings and errors. */ | |
1508 | if (flag_always_generate_output) | |
1509 | { | |
1510 | if (n_warns || n_errs) | |
0e389e77 | 1511 | as_warn (_("%d error%s, %d warning%s, generating bad object file"), |
252b5132 RH |
1512 | n_errs, n_errs == 1 ? "" : "s", |
1513 | n_warns, n_warns == 1 ? "" : "s"); | |
1514 | } | |
1515 | else | |
1516 | { | |
1517 | if (n_errs) | |
0e389e77 | 1518 | as_fatal (_("%d error%s, %d warning%s, no object file generated"), |
252b5132 RH |
1519 | n_errs, n_errs == 1 ? "" : "s", |
1520 | n_warns, n_warns == 1 ? "" : "s"); | |
1521 | } | |
1522 | } | |
1523 | ||
1524 | #ifdef OBJ_VMS | |
1525 | /* Under VMS we try to be compatible with VAX-11 "C". Thus, we call | |
1526 | a routine to check for the definition of the procedure "_main", | |
efaf0ba4 | 1527 | and if so -- fix it up so that it can be program entry point. */ |
252b5132 | 1528 | vms_check_for_main (); |
efaf0ba4 | 1529 | #endif /* OBJ_VMS */ |
252b5132 RH |
1530 | |
1531 | /* From now on, we don't care about sub-segments. Build one frag chain | |
1532 | for each segment. Linked thru fr_next. */ | |
1533 | ||
252b5132 RH |
1534 | /* Remove the sections created by gas for its own purposes. */ |
1535 | { | |
252b5132 RH |
1536 | int i; |
1537 | ||
5daa8fe7 L |
1538 | bfd_section_list_remove (stdoutput, reg_section); |
1539 | bfd_section_list_remove (stdoutput, expr_section); | |
1540 | stdoutput->section_count -= 2; | |
252b5132 RH |
1541 | i = 0; |
1542 | bfd_map_over_sections (stdoutput, renumber_sections, &i); | |
1543 | } | |
1544 | ||
1545 | bfd_map_over_sections (stdoutput, chain_frchains_together, (char *) 0); | |
252b5132 RH |
1546 | |
1547 | /* We have two segments. If user gave -R flag, then we must put the | |
1548 | data frags into the text segment. Do this before relaxing so | |
1549 | we know to take advantage of -R and make shorter addresses. */ | |
252b5132 RH |
1550 | if (flag_readonly_data_in_text) |
1551 | { | |
1552 | merge_data_into_text (); | |
1553 | } | |
252b5132 | 1554 | |
32638454 | 1555 | rsi.pass = 0; |
e46d99eb AM |
1556 | while (1) |
1557 | { | |
aacb5251 HPN |
1558 | #ifndef WORKING_DOT_WORD |
1559 | /* We need to reset the markers in the broken word list and | |
1560 | associated frags between calls to relax_segment (via | |
1561 | relax_seg). Since the broken word list is global, we do it | |
1562 | once per round, rather than locally in relax_segment for each | |
1563 | segment. */ | |
1564 | struct broken_word *brokp; | |
1565 | ||
1566 | for (brokp = broken_words; | |
1567 | brokp != (struct broken_word *) NULL; | |
1568 | brokp = brokp->next_broken_word) | |
1569 | { | |
1570 | brokp->added = 0; | |
1571 | ||
1572 | if (brokp->dispfrag != (fragS *) NULL | |
1573 | && brokp->dispfrag->fr_type == rs_broken_word) | |
1574 | brokp->dispfrag->fr_subtype = 0; | |
1575 | } | |
1576 | #endif | |
1577 | ||
32638454 AM |
1578 | rsi.changed = 0; |
1579 | bfd_map_over_sections (stdoutput, relax_seg, &rsi); | |
1580 | rsi.pass++; | |
1581 | if (!rsi.changed) | |
e46d99eb AM |
1582 | break; |
1583 | } | |
e027f3e8 | 1584 | |
87548816 NC |
1585 | /* Note - Most ports will use the default value of |
1586 | TC_FINALIZE_SYMS_BEFORE_SIZE_SEG, which 1. This will force | |
1587 | local symbols to be resolved, removing their frag information. | |
1588 | Some ports however, will not have finished relaxing all of | |
1589 | their frags and will still need the local symbol frag | |
1590 | information. These ports can set | |
1591 | TC_FINALIZE_SYMS_BEFORE_SIZE_SEG to 0. */ | |
1592 | finalize_syms = TC_FINALIZE_SYMS_BEFORE_SIZE_SEG; | |
1593 | ||
e46d99eb | 1594 | bfd_map_over_sections (stdoutput, size_seg, (char *) 0); |
e46d99eb | 1595 | |
38b87a1b NC |
1596 | /* Relaxation has completed. Freeze all syms. */ |
1597 | finalize_syms = 1; | |
1598 | ||
e0001a05 NC |
1599 | #ifdef md_post_relax_hook |
1600 | md_post_relax_hook; | |
1601 | #endif | |
1602 | ||
252b5132 RH |
1603 | #ifndef WORKING_DOT_WORD |
1604 | { | |
1605 | struct broken_word *lie; | |
1606 | struct broken_word **prevP; | |
1607 | ||
1608 | prevP = &broken_words; | |
1609 | for (lie = broken_words; lie; lie = lie->next_broken_word) | |
1610 | if (!lie->added) | |
1611 | { | |
1612 | expressionS exp; | |
1613 | ||
1614 | subseg_change (lie->seg, lie->subseg); | |
1615 | exp.X_op = O_subtract; | |
1616 | exp.X_add_symbol = lie->add; | |
1617 | exp.X_op_symbol = lie->sub; | |
1618 | exp.X_add_number = lie->addnum; | |
252b5132 RH |
1619 | #ifdef TC_CONS_FIX_NEW |
1620 | TC_CONS_FIX_NEW (lie->frag, | |
efaf0ba4 NC |
1621 | lie->word_goes_here - lie->frag->fr_literal, |
1622 | 2, &exp); | |
252b5132 RH |
1623 | #else |
1624 | fix_new_exp (lie->frag, | |
1625 | lie->word_goes_here - lie->frag->fr_literal, | |
1626 | 2, &exp, 0, BFD_RELOC_16); | |
1627 | #endif | |
252b5132 RH |
1628 | *prevP = lie->next_broken_word; |
1629 | } | |
1630 | else | |
1631 | prevP = &(lie->next_broken_word); | |
1632 | ||
1633 | for (lie = broken_words; lie;) | |
1634 | { | |
1635 | struct broken_word *untruth; | |
1636 | char *table_ptr; | |
1637 | addressT table_addr; | |
1638 | addressT from_addr, to_addr; | |
1639 | int n, m; | |
1640 | ||
1641 | subseg_change (lie->seg, lie->subseg); | |
1642 | fragP = lie->dispfrag; | |
1643 | ||
1644 | /* Find out how many broken_words go here. */ | |
1645 | n = 0; | |
efaf0ba4 NC |
1646 | for (untruth = lie; |
1647 | untruth && untruth->dispfrag == fragP; | |
1648 | untruth = untruth->next_broken_word) | |
252b5132 RH |
1649 | if (untruth->added == 1) |
1650 | n++; | |
1651 | ||
1652 | table_ptr = lie->dispfrag->fr_opcode; | |
efaf0ba4 NC |
1653 | table_addr = (lie->dispfrag->fr_address |
1654 | + (table_ptr - lie->dispfrag->fr_literal)); | |
252b5132 RH |
1655 | /* Create the jump around the long jumps. This is a short |
1656 | jump from table_ptr+0 to table_ptr+n*long_jump_size. */ | |
1657 | from_addr = table_addr; | |
1658 | to_addr = table_addr + md_short_jump_size + n * md_long_jump_size; | |
efaf0ba4 NC |
1659 | md_create_short_jump (table_ptr, from_addr, to_addr, lie->dispfrag, |
1660 | lie->add); | |
252b5132 RH |
1661 | table_ptr += md_short_jump_size; |
1662 | table_addr += md_short_jump_size; | |
1663 | ||
efaf0ba4 NC |
1664 | for (m = 0; |
1665 | lie && lie->dispfrag == fragP; | |
1666 | m++, lie = lie->next_broken_word) | |
252b5132 RH |
1667 | { |
1668 | if (lie->added == 2) | |
1669 | continue; | |
efaf0ba4 NC |
1670 | /* Patch the jump table. */ |
1671 | /* This is the offset from ??? to table_ptr+0. */ | |
252b5132 | 1672 | to_addr = table_addr - S_GET_VALUE (lie->sub); |
753f6b12 HPN |
1673 | #ifdef TC_CHECK_ADJUSTED_BROKEN_DOT_WORD |
1674 | TC_CHECK_ADJUSTED_BROKEN_DOT_WORD (to_addr, lie); | |
252b5132 RH |
1675 | #endif |
1676 | md_number_to_chars (lie->word_goes_here, to_addr, 2); | |
efaf0ba4 NC |
1677 | for (untruth = lie->next_broken_word; |
1678 | untruth && untruth->dispfrag == fragP; | |
1679 | untruth = untruth->next_broken_word) | |
252b5132 RH |
1680 | { |
1681 | if (untruth->use_jump == lie) | |
1682 | md_number_to_chars (untruth->word_goes_here, to_addr, 2); | |
1683 | } | |
1684 | ||
efaf0ba4 NC |
1685 | /* Install the long jump. */ |
1686 | /* This is a long jump from table_ptr+0 to the final target. */ | |
252b5132 RH |
1687 | from_addr = table_addr; |
1688 | to_addr = S_GET_VALUE (lie->add) + lie->addnum; | |
efaf0ba4 NC |
1689 | md_create_long_jump (table_ptr, from_addr, to_addr, lie->dispfrag, |
1690 | lie->add); | |
252b5132 RH |
1691 | table_ptr += md_long_jump_size; |
1692 | table_addr += md_long_jump_size; | |
1693 | } | |
1694 | } | |
1695 | } | |
efaf0ba4 | 1696 | #endif /* not WORKING_DOT_WORD */ |
252b5132 | 1697 | |
252b5132 RH |
1698 | /* Resolve symbol values. This needs to be done before processing |
1699 | the relocations. */ | |
1700 | if (symbol_rootP) | |
1701 | { | |
1702 | symbolS *symp; | |
1703 | ||
1704 | for (symp = symbol_rootP; symp; symp = symbol_next (symp)) | |
6386f3a7 | 1705 | resolve_symbol_value (symp); |
252b5132 | 1706 | } |
49309057 | 1707 | resolve_local_symbol_values (); |
05e9452c | 1708 | resolve_reloc_expr_symbols (); |
252b5132 RH |
1709 | |
1710 | PROGRESS (1); | |
1711 | ||
1712 | #ifdef tc_frob_file_before_adjust | |
1713 | tc_frob_file_before_adjust (); | |
1714 | #endif | |
1715 | #ifdef obj_frob_file_before_adjust | |
1716 | obj_frob_file_before_adjust (); | |
1717 | #endif | |
1718 | ||
efaf0ba4 | 1719 | bfd_map_over_sections (stdoutput, adjust_reloc_syms, (char *) 0); |
252b5132 | 1720 | |
a161fe53 AM |
1721 | #ifdef tc_frob_file_before_fix |
1722 | tc_frob_file_before_fix (); | |
1723 | #endif | |
1724 | #ifdef obj_frob_file_before_fix | |
1725 | obj_frob_file_before_fix (); | |
1726 | #endif | |
1727 | ||
1728 | bfd_map_over_sections (stdoutput, fix_segment, (char *) 0); | |
1729 | ||
252b5132 RH |
1730 | /* Set up symbol table, and write it out. */ |
1731 | if (symbol_rootP) | |
1732 | { | |
1733 | symbolS *symp; | |
aaac53f5 | 1734 | bfd_boolean skip_next_symbol = FALSE; |
252b5132 RH |
1735 | |
1736 | for (symp = symbol_rootP; symp; symp = symbol_next (symp)) | |
1737 | { | |
1738 | int punt = 0; | |
1739 | const char *name; | |
1740 | ||
aaac53f5 HPN |
1741 | if (skip_next_symbol) |
1742 | { | |
1743 | /* Don't do anything besides moving the value of the | |
1744 | symbol from the GAS value-field to the BFD value-field. */ | |
1745 | symbol_get_bfdsym (symp)->value = S_GET_VALUE (symp); | |
1746 | skip_next_symbol = FALSE; | |
1747 | continue; | |
1748 | } | |
1749 | ||
49309057 | 1750 | if (symbol_mri_common_p (symp)) |
252b5132 RH |
1751 | { |
1752 | if (S_IS_EXTERNAL (symp)) | |
1753 | as_bad (_("%s: global symbols not supported in common sections"), | |
1754 | S_GET_NAME (symp)); | |
1755 | symbol_remove (symp, &symbol_rootP, &symbol_lastP); | |
1756 | continue; | |
1757 | } | |
1758 | ||
1759 | name = S_GET_NAME (symp); | |
1760 | if (name) | |
1761 | { | |
efaf0ba4 NC |
1762 | const char *name2 = |
1763 | decode_local_label_name ((char *) S_GET_NAME (symp)); | |
252b5132 RH |
1764 | /* They only differ if `name' is a fb or dollar local |
1765 | label name. */ | |
1766 | if (name2 != name && ! S_IS_DEFINED (symp)) | |
0e389e77 | 1767 | as_bad (_("local label `%s' is not defined"), name2); |
252b5132 RH |
1768 | } |
1769 | ||
1770 | /* Do it again, because adjust_reloc_syms might introduce | |
1771 | more symbols. They'll probably only be section symbols, | |
1772 | but they'll still need to have the values computed. */ | |
6386f3a7 | 1773 | resolve_symbol_value (symp); |
252b5132 RH |
1774 | |
1775 | /* Skip symbols which were equated to undefined or common | |
b4b24b79 | 1776 | symbols. */ |
06e77878 AO |
1777 | if (symbol_equated_reloc_p (symp) |
1778 | || S_IS_WEAKREFR (symp)) | |
252b5132 | 1779 | { |
60938e80 L |
1780 | const char *name = S_GET_NAME (symp); |
1781 | if (S_IS_COMMON (symp) | |
c9cd7160 | 1782 | && !TC_FAKE_LABEL (name) |
06e77878 | 1783 | && !S_IS_WEAKREFR (symp) |
60938e80 L |
1784 | && (!S_IS_EXTERNAL (symp) || S_IS_LOCAL (symp))) |
1785 | { | |
1786 | expressionS *e = symbol_get_value_expression (symp); | |
1787 | as_bad (_("Local symbol `%s' can't be equated to common symbol `%s'"), | |
1788 | name, S_GET_NAME (e->X_add_symbol)); | |
1789 | } | |
d0548f34 L |
1790 | if (S_GET_SEGMENT (symp) == reg_section) |
1791 | { | |
1792 | /* Report error only if we know the symbol name. */ | |
1793 | if (S_GET_NAME (symp) != reg_section->name) | |
1794 | as_bad (_("can't make global register symbol `%s'"), | |
1795 | name); | |
1796 | } | |
252b5132 RH |
1797 | symbol_remove (symp, &symbol_rootP, &symbol_lastP); |
1798 | continue; | |
1799 | } | |
1800 | ||
252b5132 RH |
1801 | #ifdef obj_frob_symbol |
1802 | obj_frob_symbol (symp, punt); | |
1803 | #endif | |
1804 | #ifdef tc_frob_symbol | |
49309057 | 1805 | if (! punt || symbol_used_in_reloc_p (symp)) |
252b5132 RH |
1806 | tc_frob_symbol (symp, punt); |
1807 | #endif | |
1808 | ||
1809 | /* If we don't want to keep this symbol, splice it out of | |
1810 | the chain now. If EMIT_SECTION_SYMBOLS is 0, we never | |
1811 | want section symbols. Otherwise, we skip local symbols | |
1812 | and symbols that the frob_symbol macros told us to punt, | |
1813 | but we keep such symbols if they are used in relocs. */ | |
a161fe53 AM |
1814 | if (symp == abs_section_sym |
1815 | || (! EMIT_SECTION_SYMBOLS | |
1816 | && symbol_section_p (symp)) | |
e97b3f28 | 1817 | /* Note that S_IS_EXTERNAL and S_IS_LOCAL are not always |
252b5132 RH |
1818 | opposites. Sometimes the former checks flags and the |
1819 | latter examines the name... */ | |
e97b3f28 | 1820 | || (!S_IS_EXTERNAL (symp) |
461b725f AO |
1821 | && (punt || S_IS_LOCAL (symp) || |
1822 | (S_IS_WEAKREFD (symp) && ! symbol_used_p (symp))) | |
49309057 | 1823 | && ! symbol_used_in_reloc_p (symp))) |
252b5132 RH |
1824 | { |
1825 | symbol_remove (symp, &symbol_rootP, &symbol_lastP); | |
efaf0ba4 | 1826 | |
252b5132 RH |
1827 | /* After symbol_remove, symbol_next(symp) still returns |
1828 | the one that came after it in the chain. So we don't | |
1829 | need to do any extra cleanup work here. */ | |
252b5132 RH |
1830 | continue; |
1831 | } | |
1832 | ||
1833 | /* Make sure we really got a value for the symbol. */ | |
49309057 | 1834 | if (! symbol_resolved_p (symp)) |
252b5132 | 1835 | { |
0e389e77 | 1836 | as_bad (_("can't resolve value for symbol `%s'"), |
252b5132 | 1837 | S_GET_NAME (symp)); |
49309057 | 1838 | symbol_mark_resolved (symp); |
252b5132 RH |
1839 | } |
1840 | ||
1841 | /* Set the value into the BFD symbol. Up til now the value | |
1842 | has only been kept in the gas symbolS struct. */ | |
49309057 | 1843 | symbol_get_bfdsym (symp)->value = S_GET_VALUE (symp); |
aaac53f5 HPN |
1844 | |
1845 | /* A warning construct is a warning symbol followed by the | |
1846 | symbol warned about. Don't let anything object-format or | |
1847 | target-specific muck with it; it's ready for output. */ | |
1848 | if (symbol_get_bfdsym (symp)->flags & BSF_WARNING) | |
1849 | skip_next_symbol = TRUE; | |
252b5132 RH |
1850 | } |
1851 | } | |
1852 | ||
1853 | PROGRESS (1); | |
1854 | ||
1855 | /* Now do any format-specific adjustments to the symbol table, such | |
1856 | as adding file symbols. */ | |
1857 | #ifdef tc_adjust_symtab | |
1858 | tc_adjust_symtab (); | |
1859 | #endif | |
1860 | #ifdef obj_adjust_symtab | |
1861 | obj_adjust_symtab (); | |
1862 | #endif | |
1863 | ||
d0548f34 L |
1864 | /* Stop if there is an error. */ |
1865 | if (had_errors ()) | |
1866 | return; | |
1867 | ||
252b5132 RH |
1868 | /* Now that all the sizes are known, and contents correct, we can |
1869 | start writing to the file. */ | |
1870 | set_symtab (); | |
1871 | ||
1872 | /* If *_frob_file changes the symbol value at this point, it is | |
1873 | responsible for moving the changed value into symp->bsym->value | |
1874 | as well. Hopefully all symbol value changing can be done in | |
1875 | *_frob_symbol. */ | |
1876 | #ifdef tc_frob_file | |
1877 | tc_frob_file (); | |
1878 | #endif | |
1879 | #ifdef obj_frob_file | |
1880 | obj_frob_file (); | |
1881 | #endif | |
1882 | ||
1883 | bfd_map_over_sections (stdoutput, write_relocs, (char *) 0); | |
1884 | ||
1885 | #ifdef tc_frob_file_after_relocs | |
1886 | tc_frob_file_after_relocs (); | |
1887 | #endif | |
1888 | #ifdef obj_frob_file_after_relocs | |
1889 | obj_frob_file_after_relocs (); | |
1890 | #endif | |
1891 | ||
1892 | bfd_map_over_sections (stdoutput, write_contents, (char *) 0); | |
252b5132 | 1893 | } |
252b5132 RH |
1894 | |
1895 | #ifdef TC_GENERIC_RELAX_TABLE | |
252b5132 RH |
1896 | /* Relax a fragment by scanning TC_GENERIC_RELAX_TABLE. */ |
1897 | ||
1898 | long | |
d7342424 | 1899 | relax_frag (segT segment, fragS *fragP, long stretch) |
252b5132 RH |
1900 | { |
1901 | const relax_typeS *this_type; | |
1902 | const relax_typeS *start_type; | |
1903 | relax_substateT next_state; | |
1904 | relax_substateT this_state; | |
685736be | 1905 | offsetT growth; |
38686296 AM |
1906 | offsetT aim; |
1907 | addressT target; | |
1908 | addressT address; | |
1909 | symbolS *symbolP; | |
1910 | const relax_typeS *table; | |
1911 | ||
1912 | target = fragP->fr_offset; | |
1913 | address = fragP->fr_address; | |
1914 | table = TC_GENERIC_RELAX_TABLE; | |
252b5132 RH |
1915 | this_state = fragP->fr_subtype; |
1916 | start_type = this_type = table + this_state; | |
38686296 | 1917 | symbolP = fragP->fr_symbol; |
252b5132 RH |
1918 | |
1919 | if (symbolP) | |
1920 | { | |
c842b53a ILT |
1921 | fragS *sym_frag; |
1922 | ||
1923 | sym_frag = symbol_get_frag (symbolP); | |
1924 | ||
252b5132 | 1925 | #ifndef DIFF_EXPR_OK |
c842b53a | 1926 | know (sym_frag != NULL); |
252b5132 | 1927 | #endif |
a161fe53 | 1928 | know (S_GET_SEGMENT (symbolP) != absolute_section |
c842b53a | 1929 | || sym_frag == &zero_address_frag); |
ac62c346 | 1930 | target += S_GET_VALUE (symbolP); |
252b5132 RH |
1931 | |
1932 | /* If frag has yet to be reached on this pass, | |
1933 | assume it will move by STRETCH just as we did. | |
1934 | If this is not so, it will be because some frag | |
38686296 | 1935 | between grows, and that will force another pass. */ |
252b5132 | 1936 | |
c842b53a | 1937 | if (stretch != 0 |
38686296 AM |
1938 | && sym_frag->relax_marker != fragP->relax_marker |
1939 | && S_GET_SEGMENT (symbolP) == segment) | |
252b5132 RH |
1940 | { |
1941 | target += stretch; | |
1942 | } | |
1943 | } | |
1944 | ||
1945 | aim = target - address - fragP->fr_fix; | |
1946 | #ifdef TC_PCREL_ADJUST | |
efaf0ba4 NC |
1947 | /* Currently only the ns32k family needs this. */ |
1948 | aim += TC_PCREL_ADJUST (fragP); | |
efaf0ba4 | 1949 | #endif |
59c871b4 BE |
1950 | |
1951 | #ifdef md_prepare_relax_scan | |
1952 | /* Formerly called M68K_AIM_KLUDGE. */ | |
252b5132 RH |
1953 | md_prepare_relax_scan (fragP, address, aim, this_state, this_type); |
1954 | #endif | |
1955 | ||
1956 | if (aim < 0) | |
1957 | { | |
efaf0ba4 | 1958 | /* Look backwards. */ |
252b5132 RH |
1959 | for (next_state = this_type->rlx_more; next_state;) |
1960 | if (aim >= this_type->rlx_backward) | |
1961 | next_state = 0; | |
1962 | else | |
1963 | { | |
efaf0ba4 | 1964 | /* Grow to next state. */ |
252b5132 RH |
1965 | this_state = next_state; |
1966 | this_type = table + this_state; | |
1967 | next_state = this_type->rlx_more; | |
1968 | } | |
1969 | } | |
1970 | else | |
1971 | { | |
efaf0ba4 | 1972 | /* Look forwards. */ |
252b5132 RH |
1973 | for (next_state = this_type->rlx_more; next_state;) |
1974 | if (aim <= this_type->rlx_forward) | |
1975 | next_state = 0; | |
1976 | else | |
1977 | { | |
efaf0ba4 | 1978 | /* Grow to next state. */ |
252b5132 RH |
1979 | this_state = next_state; |
1980 | this_type = table + this_state; | |
1981 | next_state = this_type->rlx_more; | |
1982 | } | |
1983 | } | |
1984 | ||
1985 | growth = this_type->rlx_length - start_type->rlx_length; | |
1986 | if (growth != 0) | |
1987 | fragP->fr_subtype = this_state; | |
1988 | return growth; | |
1989 | } | |
1990 | ||
efaf0ba4 | 1991 | #endif /* defined (TC_GENERIC_RELAX_TABLE) */ |
252b5132 RH |
1992 | |
1993 | /* Relax_align. Advance location counter to next address that has 'alignment' | |
1994 | lowest order bits all 0s, return size of adjustment made. */ | |
1995 | static relax_addressT | |
d7342424 KH |
1996 | relax_align (register relax_addressT address, /* Address now. */ |
1997 | register int alignment /* Alignment (binary). */) | |
252b5132 RH |
1998 | { |
1999 | relax_addressT mask; | |
2000 | relax_addressT new_address; | |
2001 | ||
2002 | mask = ~((~0) << alignment); | |
2003 | new_address = (address + mask) & (~mask); | |
2004 | #ifdef LINKER_RELAXING_SHRINKS_ONLY | |
2005 | if (linkrelax) | |
2006 | /* We must provide lots of padding, so the linker can discard it | |
2007 | when needed. The linker will not add extra space, ever. */ | |
2008 | new_address += (1 << alignment); | |
2009 | #endif | |
2010 | return (new_address - address); | |
2011 | } | |
2012 | ||
efaf0ba4 NC |
2013 | /* Now we have a segment, not a crowd of sub-segments, we can make |
2014 | fr_address values. | |
58a77e41 | 2015 | |
efaf0ba4 | 2016 | Relax the frags. |
58a77e41 | 2017 | |
efaf0ba4 NC |
2018 | After this, all frags in this segment have addresses that are correct |
2019 | within the segment. Since segments live in different file addresses, | |
2020 | these frag addresses may not be the same as final object-file | |
2021 | addresses. */ | |
2022 | ||
e46d99eb | 2023 | int |
32638454 | 2024 | relax_segment (struct frag *segment_frag_root, segT segment, int pass) |
252b5132 | 2025 | { |
4111faa5 NC |
2026 | unsigned long frag_count; |
2027 | struct frag *fragP; | |
2028 | relax_addressT address; | |
e46d99eb AM |
2029 | int ret; |
2030 | ||
efaf0ba4 | 2031 | /* In case md_estimate_size_before_relax() wants to make fixSs. */ |
252b5132 RH |
2032 | subseg_change (segment, 0); |
2033 | ||
2034 | /* For each frag in segment: count and store (a 1st guess of) | |
2035 | fr_address. */ | |
2036 | address = 0; | |
4111faa5 NC |
2037 | for (frag_count = 0, fragP = segment_frag_root; |
2038 | fragP; | |
2039 | fragP = fragP->fr_next, frag_count ++) | |
252b5132 | 2040 | { |
38686296 | 2041 | fragP->relax_marker = 0; |
252b5132 RH |
2042 | fragP->fr_address = address; |
2043 | address += fragP->fr_fix; | |
2044 | ||
2045 | switch (fragP->fr_type) | |
2046 | { | |
2047 | case rs_fill: | |
2048 | address += fragP->fr_offset * fragP->fr_var; | |
2049 | break; | |
2050 | ||
2051 | case rs_align: | |
2052 | case rs_align_code: | |
0a9ef439 | 2053 | case rs_align_test: |
252b5132 RH |
2054 | { |
2055 | addressT offset = relax_align (address, (int) fragP->fr_offset); | |
2056 | ||
2057 | if (fragP->fr_subtype != 0 && offset > fragP->fr_subtype) | |
2058 | offset = 0; | |
2059 | ||
2060 | if (offset % fragP->fr_var != 0) | |
2061 | { | |
54d3cad9 AM |
2062 | as_bad_where (fragP->fr_file, fragP->fr_line, |
2063 | _("alignment padding (%lu bytes) not a multiple of %ld"), | |
2064 | (unsigned long) offset, (long) fragP->fr_var); | |
252b5132 RH |
2065 | offset -= (offset % fragP->fr_var); |
2066 | } | |
2067 | ||
2068 | address += offset; | |
2069 | } | |
2070 | break; | |
2071 | ||
2072 | case rs_org: | |
2073 | case rs_space: | |
2074 | /* Assume .org is nugatory. It will grow with 1st relax. */ | |
2075 | break; | |
2076 | ||
2077 | case rs_machine_dependent: | |
e0890092 AM |
2078 | /* If fr_symbol is an expression, this call to |
2079 | resolve_symbol_value sets up the correct segment, which will | |
2080 | likely be needed in md_estimate_size_before_relax. */ | |
2081 | if (fragP->fr_symbol) | |
2082 | resolve_symbol_value (fragP->fr_symbol); | |
2083 | ||
252b5132 RH |
2084 | address += md_estimate_size_before_relax (fragP, segment); |
2085 | break; | |
2086 | ||
2087 | #ifndef WORKING_DOT_WORD | |
efaf0ba4 | 2088 | /* Broken words don't concern us yet. */ |
252b5132 RH |
2089 | case rs_broken_word: |
2090 | break; | |
2091 | #endif | |
2092 | ||
2093 | case rs_leb128: | |
efaf0ba4 | 2094 | /* Initial guess is always 1; doing otherwise can result in |
252b5132 RH |
2095 | stable solutions that are larger than the minimum. */ |
2096 | address += fragP->fr_offset = 1; | |
2097 | break; | |
2098 | ||
2099 | case rs_cfa: | |
2100 | address += eh_frame_estimate_size_before_relax (fragP); | |
2101 | break; | |
2102 | ||
220e750f RH |
2103 | case rs_dwarf2dbg: |
2104 | address += dwarf2dbg_estimate_size_before_relax (fragP); | |
2105 | break; | |
2106 | ||
252b5132 RH |
2107 | default: |
2108 | BAD_CASE (fragP->fr_type); | |
2109 | break; | |
efaf0ba4 NC |
2110 | } |
2111 | } | |
252b5132 RH |
2112 | |
2113 | /* Do relax(). */ | |
2114 | { | |
4111faa5 | 2115 | unsigned long max_iterations; |
d1c5f158 AM |
2116 | |
2117 | /* Cumulative address adjustment. */ | |
2118 | offsetT stretch; | |
2119 | ||
2120 | /* Have we made any adjustment this pass? We can't just test | |
2121 | stretch because one piece of code may have grown and another | |
2122 | shrank. */ | |
2123 | int stretched; | |
2124 | ||
2125 | /* Most horrible, but gcc may give us some exception data that | |
2126 | is impossible to assemble, of the form | |
2127 | ||
2128 | .align 4 | |
2129 | .byte 0, 0 | |
2130 | .uleb128 end - start | |
2131 | start: | |
2132 | .space 128*128 - 1 | |
2133 | .align 4 | |
2134 | end: | |
2135 | ||
2136 | If the leb128 is two bytes in size, then end-start is 128*128, | |
2137 | which requires a three byte leb128. If the leb128 is three | |
2138 | bytes in size, then end-start is 128*128-1, which requires a | |
2139 | two byte leb128. We work around this dilemma by inserting | |
2140 | an extra 4 bytes of alignment just after the .align. This | |
2141 | works because the data after the align is accessed relative to | |
2142 | the end label. | |
2143 | ||
2144 | This counter is used in a tiny state machine to detect | |
2145 | whether a leb128 followed by an align is impossible to | |
2146 | relax. */ | |
2147 | int rs_leb128_fudge = 0; | |
252b5132 | 2148 | |
4111faa5 NC |
2149 | /* We want to prevent going into an infinite loop where one frag grows |
2150 | depending upon the location of a symbol which is in turn moved by | |
2151 | the growing frag. eg: | |
2152 | ||
b4b24b79 AM |
2153 | foo = . |
2154 | .org foo+16 | |
2155 | foo = . | |
4111faa5 | 2156 | |
b4b24b79 | 2157 | So we dictate that this algorithm can be at most O2. */ |
4111faa5 NC |
2158 | max_iterations = frag_count * frag_count; |
2159 | /* Check for overflow. */ | |
2160 | if (max_iterations < frag_count) | |
2161 | max_iterations = frag_count; | |
2162 | ||
32638454 | 2163 | ret = 0; |
252b5132 RH |
2164 | do |
2165 | { | |
e46d99eb AM |
2166 | stretch = 0; |
2167 | stretched = 0; | |
58a77e41 | 2168 | |
252b5132 RH |
2169 | for (fragP = segment_frag_root; fragP; fragP = fragP->fr_next) |
2170 | { | |
685736be | 2171 | offsetT growth = 0; |
252b5132 RH |
2172 | addressT was_address; |
2173 | offsetT offset; | |
2174 | symbolS *symbolP; | |
2175 | ||
38686296 | 2176 | fragP->relax_marker ^= 1; |
252b5132 RH |
2177 | was_address = fragP->fr_address; |
2178 | address = fragP->fr_address += stretch; | |
2179 | symbolP = fragP->fr_symbol; | |
2180 | offset = fragP->fr_offset; | |
2181 | ||
2182 | switch (fragP->fr_type) | |
2183 | { | |
efaf0ba4 | 2184 | case rs_fill: /* .fill never relaxes. */ |
252b5132 RH |
2185 | growth = 0; |
2186 | break; | |
2187 | ||
2188 | #ifndef WORKING_DOT_WORD | |
2189 | /* JF: This is RMS's idea. I do *NOT* want to be blamed | |
2190 | for it I do not want to write it. I do not want to have | |
2191 | anything to do with it. This is not the proper way to | |
2192 | implement this misfeature. */ | |
2193 | case rs_broken_word: | |
2194 | { | |
2195 | struct broken_word *lie; | |
2196 | struct broken_word *untruth; | |
2197 | ||
2198 | /* Yes this is ugly (storing the broken_word pointer | |
2199 | in the symbol slot). Still, this whole chunk of | |
2200 | code is ugly, and I don't feel like doing anything | |
2201 | about it. Think of it as stubbornness in action. */ | |
2202 | growth = 0; | |
2203 | for (lie = (struct broken_word *) (fragP->fr_symbol); | |
2204 | lie && lie->dispfrag == fragP; | |
2205 | lie = lie->next_broken_word) | |
2206 | { | |
2207 | ||
2208 | if (lie->added) | |
2209 | continue; | |
2210 | ||
ac62c346 | 2211 | offset = (S_GET_VALUE (lie->add) |
252b5132 | 2212 | + lie->addnum |
ac62c346 | 2213 | - S_GET_VALUE (lie->sub)); |
252b5132 RH |
2214 | if (offset <= -32768 || offset >= 32767) |
2215 | { | |
2216 | if (flag_warn_displacement) | |
2217 | { | |
2218 | char buf[50]; | |
2219 | sprint_value (buf, (addressT) lie->addnum); | |
54d3cad9 AM |
2220 | as_warn_where (fragP->fr_file, fragP->fr_line, |
2221 | _(".word %s-%s+%s didn't fit"), | |
2222 | S_GET_NAME (lie->add), | |
2223 | S_GET_NAME (lie->sub), | |
2224 | buf); | |
252b5132 RH |
2225 | } |
2226 | lie->added = 1; | |
2227 | if (fragP->fr_subtype == 0) | |
2228 | { | |
2229 | fragP->fr_subtype++; | |
2230 | growth += md_short_jump_size; | |
2231 | } | |
2232 | for (untruth = lie->next_broken_word; | |
2233 | untruth && untruth->dispfrag == lie->dispfrag; | |
2234 | untruth = untruth->next_broken_word) | |
49309057 ILT |
2235 | if ((symbol_get_frag (untruth->add) |
2236 | == symbol_get_frag (lie->add)) | |
2237 | && (S_GET_VALUE (untruth->add) | |
2238 | == S_GET_VALUE (lie->add))) | |
252b5132 RH |
2239 | { |
2240 | untruth->added = 2; | |
2241 | untruth->use_jump = lie; | |
2242 | } | |
2243 | growth += md_long_jump_size; | |
2244 | } | |
2245 | } | |
2246 | ||
2247 | break; | |
efaf0ba4 | 2248 | } /* case rs_broken_word */ |
252b5132 RH |
2249 | #endif |
2250 | case rs_align: | |
2251 | case rs_align_code: | |
0a9ef439 | 2252 | case rs_align_test: |
252b5132 RH |
2253 | { |
2254 | addressT oldoff, newoff; | |
2255 | ||
2256 | oldoff = relax_align (was_address + fragP->fr_fix, | |
2257 | (int) offset); | |
2258 | newoff = relax_align (address + fragP->fr_fix, | |
2259 | (int) offset); | |
2260 | ||
2261 | if (fragP->fr_subtype != 0) | |
2262 | { | |
2263 | if (oldoff > fragP->fr_subtype) | |
2264 | oldoff = 0; | |
2265 | if (newoff > fragP->fr_subtype) | |
2266 | newoff = 0; | |
2267 | } | |
2268 | ||
2269 | growth = newoff - oldoff; | |
d1c5f158 AM |
2270 | |
2271 | /* If this align happens to follow a leb128 and | |
2272 | we have determined that the leb128 is bouncing | |
2273 | in size, then break the cycle by inserting an | |
2274 | extra alignment. */ | |
2275 | if (growth < 0 | |
2276 | && (rs_leb128_fudge & 16) != 0 | |
2277 | && (rs_leb128_fudge & 15) >= 2) | |
2278 | { | |
2279 | segment_info_type *seginfo = seg_info (segment); | |
2280 | struct obstack *ob = &seginfo->frchainP->frch_obstack; | |
2281 | struct frag *newf; | |
2282 | ||
2283 | newf = frag_alloc (ob); | |
2284 | obstack_blank_fast (ob, fragP->fr_var); | |
2285 | obstack_finish (ob); | |
2286 | memcpy (newf, fragP, SIZEOF_STRUCT_FRAG); | |
2287 | memcpy (newf->fr_literal, | |
2288 | fragP->fr_literal + fragP->fr_fix, | |
2289 | fragP->fr_var); | |
2290 | newf->fr_type = rs_fill; | |
2291 | newf->fr_fix = 0; | |
2292 | newf->fr_offset = (((offsetT) 1 << fragP->fr_offset) | |
2293 | / fragP->fr_var); | |
2294 | if (newf->fr_offset * newf->fr_var | |
2295 | != (offsetT) 1 << fragP->fr_offset) | |
2296 | { | |
2297 | newf->fr_offset = (offsetT) 1 << fragP->fr_offset; | |
2298 | newf->fr_var = 1; | |
2299 | } | |
2300 | /* Include growth of new frag, because rs_fill | |
2301 | frags don't normally grow. */ | |
2302 | growth += newf->fr_offset * newf->fr_var; | |
2303 | /* The new frag address is newoff. Adjust this | |
2304 | for the amount we'll add when we process the | |
2305 | new frag. */ | |
2306 | newf->fr_address = newoff - stretch - growth; | |
2307 | newf->relax_marker ^= 1; | |
2308 | fragP->fr_next = newf; | |
2309 | #ifdef DEBUG | |
2310 | as_warn (_("padding added")); | |
2311 | #endif | |
2312 | } | |
252b5132 RH |
2313 | } |
2314 | break; | |
2315 | ||
2316 | case rs_org: | |
2317 | { | |
e46d99eb AM |
2318 | addressT target = offset; |
2319 | addressT after; | |
252b5132 RH |
2320 | |
2321 | if (symbolP) | |
2322 | { | |
b4b24b79 AM |
2323 | /* Convert from an actual address to an octet offset |
2324 | into the section. Here it is assumed that the | |
2325 | section's VMA is zero, and can omit subtracting it | |
2326 | from the symbol's value to get the address offset. */ | |
2327 | know (S_GET_SEGMENT (symbolP)->vma == 0); | |
6e917903 | 2328 | target += S_GET_VALUE (symbolP) * OCTETS_PER_BYTE; |
ac62c346 | 2329 | } |
252b5132 RH |
2330 | |
2331 | know (fragP->fr_next); | |
6afe8e98 | 2332 | after = fragP->fr_next->fr_address + stretch; |
252b5132 RH |
2333 | growth = target - after; |
2334 | if (growth < 0) | |
2335 | { | |
32638454 AM |
2336 | growth = 0; |
2337 | ||
2338 | /* Don't error on first few frag relax passes. | |
2339 | The symbol might be an expression involving | |
2340 | symbol values from other sections. If those | |
2341 | sections have not yet been processed their | |
2342 | frags will all have zero addresses, so we | |
2343 | will calculate incorrect values for them. The | |
2344 | number of passes we allow before giving an | |
2345 | error is somewhat arbitrary. It should be at | |
2346 | least one, with larger values requiring | |
2347 | increasingly contrived dependencies between | |
2348 | frags to trigger a false error. */ | |
2349 | if (pass < 2) | |
2350 | { | |
2351 | /* Force another pass. */ | |
2352 | ret = 1; | |
2353 | break; | |
2354 | } | |
2355 | ||
252b5132 RH |
2356 | /* Growth may be negative, but variable part of frag |
2357 | cannot have fewer than 0 chars. That is, we can't | |
efaf0ba4 | 2358 | .org backwards. */ |
14ad458a | 2359 | as_bad_where (fragP->fr_file, fragP->fr_line, |
685736be | 2360 | _("attempt to move .org backwards")); |
14ad458a ILT |
2361 | |
2362 | /* We've issued an error message. Change the | |
b4b24b79 | 2363 | frag to avoid cascading errors. */ |
14ad458a ILT |
2364 | fragP->fr_type = rs_align; |
2365 | fragP->fr_subtype = 0; | |
2366 | fragP->fr_offset = 0; | |
6afe8e98 | 2367 | fragP->fr_fix = after - address; |
252b5132 | 2368 | } |
252b5132 | 2369 | } |
6afe8e98 | 2370 | break; |
252b5132 RH |
2371 | |
2372 | case rs_space: | |
54d3cad9 | 2373 | growth = 0; |
252b5132 RH |
2374 | if (symbolP) |
2375 | { | |
766c03c9 AM |
2376 | offsetT amount; |
2377 | ||
2378 | amount = S_GET_VALUE (symbolP); | |
9e40345d | 2379 | if (S_GET_SEGMENT (symbolP) != absolute_section |
252b5132 RH |
2380 | || S_IS_COMMON (symbolP) |
2381 | || ! S_IS_DEFINED (symbolP)) | |
252b5132 | 2382 | { |
54d3cad9 AM |
2383 | as_bad_where (fragP->fr_file, fragP->fr_line, |
2384 | _(".space specifies non-absolute value")); | |
2385 | /* Prevent repeat of this error message. */ | |
2386 | fragP->fr_symbol = 0; | |
2387 | } | |
2388 | else if (amount < 0) | |
2389 | { | |
32638454 AM |
2390 | /* Don't error on first few frag relax passes. |
2391 | See rs_org comment for a longer explanation. */ | |
2392 | if (pass < 2) | |
2393 | { | |
2394 | ret = 1; | |
2395 | break; | |
2396 | } | |
2397 | ||
54d3cad9 AM |
2398 | as_warn_where (fragP->fr_file, fragP->fr_line, |
2399 | _(".space or .fill with negative value, ignored")); | |
766c03c9 | 2400 | fragP->fr_symbol = 0; |
252b5132 | 2401 | } |
54d3cad9 | 2402 | else |
050be34e | 2403 | growth = (was_address + fragP->fr_fix + amount |
54d3cad9 | 2404 | - fragP->fr_next->fr_address); |
252b5132 | 2405 | } |
252b5132 RH |
2406 | break; |
2407 | ||
2408 | case rs_machine_dependent: | |
2409 | #ifdef md_relax_frag | |
c842b53a | 2410 | growth = md_relax_frag (segment, fragP, stretch); |
252b5132 RH |
2411 | #else |
2412 | #ifdef TC_GENERIC_RELAX_TABLE | |
2413 | /* The default way to relax a frag is to look through | |
2414 | TC_GENERIC_RELAX_TABLE. */ | |
c842b53a | 2415 | growth = relax_frag (segment, fragP, stretch); |
efaf0ba4 | 2416 | #endif /* TC_GENERIC_RELAX_TABLE */ |
252b5132 RH |
2417 | #endif |
2418 | break; | |
2419 | ||
2420 | case rs_leb128: | |
2421 | { | |
2422 | valueT value; | |
685736be | 2423 | offsetT size; |
252b5132 | 2424 | |
6386f3a7 | 2425 | value = resolve_symbol_value (fragP->fr_symbol); |
252b5132 RH |
2426 | size = sizeof_leb128 (value, fragP->fr_subtype); |
2427 | growth = size - fragP->fr_offset; | |
2428 | fragP->fr_offset = size; | |
2429 | } | |
2430 | break; | |
2431 | ||
2432 | case rs_cfa: | |
2433 | growth = eh_frame_relax_frag (fragP); | |
2434 | break; | |
2435 | ||
220e750f RH |
2436 | case rs_dwarf2dbg: |
2437 | growth = dwarf2dbg_relax_frag (fragP); | |
2438 | break; | |
2439 | ||
252b5132 RH |
2440 | default: |
2441 | BAD_CASE (fragP->fr_type); | |
2442 | break; | |
2443 | } | |
2444 | if (growth) | |
2445 | { | |
2446 | stretch += growth; | |
e46d99eb | 2447 | stretched = 1; |
d1c5f158 AM |
2448 | if (fragP->fr_type == rs_leb128) |
2449 | rs_leb128_fudge += 16; | |
2450 | else if (fragP->fr_type == rs_align | |
2451 | && (rs_leb128_fudge & 16) != 0 | |
2452 | && stretch == 0) | |
2453 | rs_leb128_fudge += 16; | |
2454 | else | |
2455 | rs_leb128_fudge = 0; | |
252b5132 | 2456 | } |
4111faa5 | 2457 | } |
d1c5f158 AM |
2458 | |
2459 | if (stretch == 0 | |
2460 | && (rs_leb128_fudge & 16) == 0 | |
2461 | && (rs_leb128_fudge & -16) != 0) | |
2462 | rs_leb128_fudge += 1; | |
2463 | else | |
2464 | rs_leb128_fudge = 0; | |
252b5132 | 2465 | } |
4111faa5 NC |
2466 | /* Until nothing further to relax. */ |
2467 | while (stretched && -- max_iterations); | |
2468 | ||
2469 | if (stretched) | |
2470 | as_fatal (_("Infinite loop encountered whilst attempting to compute the addresses of symbols in section %s"), | |
2471 | segment_name (segment)); | |
2472 | } | |
252b5132 | 2473 | |
e46d99eb AM |
2474 | for (fragP = segment_frag_root; fragP; fragP = fragP->fr_next) |
2475 | if (fragP->last_fr_address != fragP->fr_address) | |
2476 | { | |
2477 | fragP->last_fr_address = fragP->fr_address; | |
2478 | ret = 1; | |
2479 | } | |
2480 | return ret; | |
efaf0ba4 | 2481 | } |
252b5132 | 2482 | |
252b5132 | 2483 | void |
d7342424 | 2484 | number_to_chars_bigendian (char *buf, valueT val, int n) |
252b5132 | 2485 | { |
937149dd | 2486 | if (n <= 0) |
252b5132 RH |
2487 | abort (); |
2488 | while (n--) | |
2489 | { | |
2490 | buf[n] = val & 0xff; | |
2491 | val >>= 8; | |
2492 | } | |
2493 | } | |
2494 | ||
2495 | void | |
d7342424 | 2496 | number_to_chars_littleendian (char *buf, valueT val, int n) |
252b5132 | 2497 | { |
937149dd | 2498 | if (n <= 0) |
252b5132 RH |
2499 | abort (); |
2500 | while (n--) | |
2501 | { | |
2502 | *buf++ = val & 0xff; | |
2503 | val >>= 8; | |
2504 | } | |
2505 | } | |
2506 | ||
2507 | void | |
d7342424 | 2508 | write_print_statistics (FILE *file) |
252b5132 | 2509 | { |
6d4d30bb | 2510 | fprintf (file, "fixups: %d\n", n_fixups); |
252b5132 RH |
2511 | } |
2512 | ||
efaf0ba4 | 2513 | /* For debugging. */ |
252b5132 RH |
2514 | extern int indent_level; |
2515 | ||
2516 | void | |
d7342424 | 2517 | print_fixup (fixS *fixp) |
252b5132 RH |
2518 | { |
2519 | indent_level = 1; | |
d2df793a NC |
2520 | fprintf (stderr, "fix "); |
2521 | fprintf_vma (stderr, (bfd_vma)((bfd_hostptr_t) fixp)); | |
2522 | fprintf (stderr, " %s:%d",fixp->fx_file, fixp->fx_line); | |
252b5132 RH |
2523 | if (fixp->fx_pcrel) |
2524 | fprintf (stderr, " pcrel"); | |
2525 | if (fixp->fx_pcrel_adjust) | |
2526 | fprintf (stderr, " pcrel_adjust=%d", fixp->fx_pcrel_adjust); | |
2527 | if (fixp->fx_im_disp) | |
2528 | { | |
2529 | #ifdef TC_NS32K | |
2530 | fprintf (stderr, " im_disp=%d", fixp->fx_im_disp); | |
2531 | #else | |
2532 | fprintf (stderr, " im_disp"); | |
2533 | #endif | |
2534 | } | |
2535 | if (fixp->fx_tcbit) | |
2536 | fprintf (stderr, " tcbit"); | |
2537 | if (fixp->fx_done) | |
2538 | fprintf (stderr, " done"); | |
d2df793a NC |
2539 | fprintf (stderr, "\n size=%d frag=", fixp->fx_size); |
2540 | fprintf_vma (stderr, (bfd_vma) ((bfd_hostptr_t) fixp->fx_frag)); | |
2541 | fprintf (stderr, " where=%ld offset=%lx addnumber=%lx", | |
2542 | (long) fixp->fx_where, | |
0af1713e AM |
2543 | (unsigned long) fixp->fx_offset, |
2544 | (unsigned long) fixp->fx_addnumber); | |
252b5132 RH |
2545 | fprintf (stderr, "\n %s (%d)", bfd_get_reloc_code_name (fixp->fx_r_type), |
2546 | fixp->fx_r_type); | |
252b5132 RH |
2547 | if (fixp->fx_addsy) |
2548 | { | |
2549 | fprintf (stderr, "\n +<"); | |
2550 | print_symbol_value_1 (stderr, fixp->fx_addsy); | |
2551 | fprintf (stderr, ">"); | |
2552 | } | |
2553 | if (fixp->fx_subsy) | |
2554 | { | |
2555 | fprintf (stderr, "\n -<"); | |
2556 | print_symbol_value_1 (stderr, fixp->fx_subsy); | |
2557 | fprintf (stderr, ">"); | |
2558 | } | |
2559 | fprintf (stderr, "\n"); | |
2560 | #ifdef TC_FIX_DATA_PRINT | |
2561 | TC_FIX_DATA_PRINT (stderr, fixp); | |
2562 | #endif | |
2563 | } |