1 /* write.c - emit .o file
2 Copyright (C) 1986, 87, 90, 91, 92, 93, 94, 1995
3 Free Software Foundation, Inc.
5 This file is part of GAS, the GNU Assembler.
7 GAS is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 2, or (at your option)
12 GAS is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with GAS; see the file COPYING. If not, write to
19 the Free Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
21 /* This thing should be set up to do byteordering correctly. But... */
26 #include "output-file.h"
28 /* This looks like a good idea. Let's try turning it on always, for now. */
29 #undef BFD_FAST_SECTION_FILL
30 #define BFD_FAST_SECTION_FILL
32 /* The NOP_OPCODE is for the alignment fill value. Fill it with a nop
33 instruction so that the disassembler does not choke on it. */
35 #define NOP_OPCODE 0x00
38 #ifndef TC_ADJUST_RELOC_COUNT
39 #define TC_ADJUST_RELOC_COUNT(FIXP,COUNT)
42 #ifndef TC_FORCE_RELOCATION
43 #define TC_FORCE_RELOCATION(FIXP) 0
46 #ifndef WORKING_DOT_WORD
47 extern CONST int md_short_jump_size;
48 extern CONST int md_long_jump_size;
51 int symbol_table_frozen;
52 void print_fixup PARAMS ((fixS *));
55 static void renumber_sections PARAMS ((bfd *, asection *, PTR));
57 /* We generally attach relocs to frag chains. However, after we have
58 chained these all together into a segment, any relocs we add after
59 that must be attached to a segment. This will include relocs added
60 in md_estimate_size_for_relax, for example. */
61 static int frags_chained = 0;
67 struct frag *text_frag_root;
68 struct frag *data_frag_root;
69 struct frag *bss_frag_root;
71 struct frag *text_last_frag; /* Last frag in segment. */
72 struct frag *data_last_frag; /* Last frag in segment. */
73 static struct frag *bss_last_frag; /* Last frag in segment. */
77 static object_headers headers;
80 long string_byte_count;
81 char *next_object_file_charP; /* Tracks object file bytes. */
84 int magic_number_for_object_file = DEFAULT_MAGIC_NUMBER_FOR_OBJECT_FILE;
87 #endif /* BFD_ASSEMBLER */
90 static fixS *fix_new_internal PARAMS ((fragS *, int where, int size,
91 symbolS *add, symbolS *sub,
92 offsetT offset, int pcrel,
93 bfd_reloc_code_real_type r_type));
95 static fixS *fix_new_internal PARAMS ((fragS *, int where, int size,
96 symbolS *add, symbolS *sub,
97 offsetT offset, int pcrel,
100 #if defined (BFD_ASSEMBLER) || (!defined (BFD) && !defined (OBJ_VMS))
101 static long fixup_segment PARAMS ((fixS * fixP, segT this_segment_type));
103 static relax_addressT relax_align PARAMS ((relax_addressT addr, int align));
108 * Create a fixS in obstack 'notes'.
111 fix_new_internal (frag, where, size, add_symbol, sub_symbol, offset, pcrel,
113 fragS *frag; /* Which frag? */
114 int where; /* Where in that frag? */
115 int size; /* 1, 2, or 4 usually. */
116 symbolS *add_symbol; /* X_add_symbol. */
117 symbolS *sub_symbol; /* X_op_symbol. */
118 offsetT offset; /* X_add_number. */
119 int pcrel; /* TRUE if PC-relative relocation. */
121 bfd_reloc_code_real_type r_type; /* Relocation type */
123 int r_type; /* Relocation type */
128 fixP = (fixS *) obstack_alloc (¬es, sizeof (fixS));
130 fixP->fx_frag = frag;
131 fixP->fx_where = where;
132 fixP->fx_size = size;
133 fixP->fx_addsy = add_symbol;
134 fixP->fx_subsy = sub_symbol;
135 fixP->fx_offset = offset;
136 fixP->fx_pcrel = pcrel;
138 #if defined(NEED_FX_R_TYPE) || defined (BFD_ASSEMBLER)
139 fixP->fx_r_type = r_type;
141 fixP->fx_im_disp = 0;
142 fixP->fx_pcrel_adjust = 0;
143 fixP->fx_bit_fixP = 0;
144 fixP->fx_addnumber = 0;
145 fixP->tc_fix_data = NULL;
149 #if defined (TC_I960) || defined (TC_NS32K)
153 as_where (&fixP->fx_file, &fixP->fx_line);
155 /* Usually, we want relocs sorted numerically, but while
156 comparing to older versions of gas that have relocs
157 reverse sorted, it is convenient to have this compile
158 time option. xoxorich. */
163 fixS **seg_fix_rootP = (frags_chained
164 ? &seg_info (now_seg)->fix_root
165 : &frchain_now->fix_root);
166 fixS **seg_fix_tailP = (frags_chained
167 ? &seg_info (now_seg)->fix_tail
168 : &frchain_now->fix_tail);
171 #ifdef REVERSE_SORT_RELOCS
173 fixP->fx_next = *seg_fix_rootP;
174 *seg_fix_rootP = fixP;
176 #else /* REVERSE_SORT_RELOCS */
178 fixP->fx_next = NULL;
181 (*seg_fix_tailP)->fx_next = fixP;
183 *seg_fix_rootP = fixP;
184 *seg_fix_tailP = fixP;
186 #endif /* REVERSE_SORT_RELOCS */
193 /* Create a fixup relative to a symbol (plus a constant). */
196 fix_new (frag, where, size, add_symbol, offset, pcrel, r_type)
197 fragS *frag; /* Which frag? */
198 int where; /* Where in that frag? */
199 int size; /* 1, 2, or 4 usually. */
200 symbolS *add_symbol; /* X_add_symbol. */
201 offsetT offset; /* X_add_number. */
202 int pcrel; /* TRUE if PC-relative relocation. */
204 bfd_reloc_code_real_type r_type; /* Relocation type */
206 int r_type; /* Relocation type */
209 return fix_new_internal (frag, where, size, add_symbol,
210 (symbolS *) NULL, offset, pcrel, r_type);
213 /* Create a fixup for an expression. Currently we only support fixups
214 for difference expressions. That is itself more than most object
215 file formats support anyhow. */
218 fix_new_exp (frag, where, size, exp, pcrel, r_type)
219 fragS *frag; /* Which frag? */
220 int where; /* Where in that frag? */
221 int size; /* 1, 2, or 4 usually. */
222 expressionS *exp; /* Expression. */
223 int pcrel; /* TRUE if PC-relative relocation. */
225 bfd_reloc_code_real_type r_type; /* Relocation type */
227 int r_type; /* Relocation type */
240 /* This comes up when _GLOBAL_OFFSET_TABLE_+(.-L0) is read, if
241 the difference expression cannot immediately be reduced. */
243 extern symbolS *make_expr_symbol ();
244 symbolS *stmp = make_expr_symbol (exp);
245 exp->X_op = O_symbol;
246 exp->X_op_symbol = 0;
247 exp->X_add_symbol = stmp;
248 exp->X_add_number = 0;
249 return fix_new_exp (frag, where, size, exp, pcrel, r_type);
253 sub = exp->X_add_symbol;
254 off = exp->X_add_number;
258 sub = exp->X_op_symbol;
261 add = exp->X_add_symbol;
264 off = exp->X_add_number;
268 as_bad ("expression too complex for fixup");
271 return fix_new_internal (frag, where, size, add, sub, off,
275 /* Append a string onto another string, bumping the pointer along. */
277 append (charPP, fromP, length)
280 unsigned long length;
282 /* Don't trust memcpy() of 0 chars. */
286 memcpy (*charPP, fromP, length);
290 #ifndef BFD_ASSEMBLER
291 int section_alignment[SEG_MAXIMUM_ORDINAL];
295 * This routine records the largest alignment seen for each segment.
296 * If the beginning of the segment is aligned on the worst-case
297 * boundary, all of the other alignments within it will work. At
298 * least one object format really uses this info.
301 record_alignment (seg, align)
302 /* Segment to which alignment pertains */
304 /* Alignment, as a power of 2 (e.g., 1 => 2-byte boundary, 2 => 4-byte
308 if (seg == absolute_section)
311 if (align > bfd_get_section_alignment (stdoutput, seg))
312 bfd_set_section_alignment (stdoutput, seg, align);
314 if (align > section_alignment[(int) seg])
315 section_alignment[(int) seg] = align;
321 /* Reset the section indices after removing the gas created sections. */
324 renumber_sections (abfd, sec, countparg)
329 int *countp = (int *) countparg;
331 sec->index = *countp;
335 #endif /* defined (BFD_ASSEMBLER) */
337 #if defined (BFD_ASSEMBLER) || ! defined (BFD)
340 chain_frchains_together_1 (section, frchp)
342 struct frchain *frchp;
344 fragS dummy, *prev_frag = &dummy;
346 fixS fix_dummy, *prev_fix = &fix_dummy;
349 for (; frchp && frchp->frch_seg == section; frchp = frchp->frch_next)
351 prev_frag->fr_next = frchp->frch_root;
352 prev_frag = frchp->frch_last;
354 if (frchp->fix_root != (fixS *) NULL)
356 if (seg_info (section)->fix_root == (fixS *) NULL)
357 seg_info (section)->fix_root = frchp->fix_root;
358 prev_fix->fx_next = frchp->fix_root;
359 seg_info (section)->fix_tail = frchp->fix_tail;
360 prev_fix = frchp->fix_tail;
364 prev_frag->fr_next = 0;
373 chain_frchains_together (abfd, section, xxx)
374 bfd *abfd; /* unused */
376 PTR xxx; /* unused */
378 segment_info_type *info;
380 /* BFD may have introduced its own sections without using
381 subseg_new, so it is possible that seg_info is NULL. */
382 info = seg_info (section);
383 if (info != (segment_info_type *) NULL)
384 info->frchainP->frch_last
385 = chain_frchains_together_1 (section, info->frchainP);
387 /* Now that we've chained the frags together, we must add new fixups
388 to the segment, not to the frag chain. */
394 #if !defined (BFD) && !defined (BFD_ASSEMBLER)
397 remove_subsegs (head, seg, root, last)
403 *root = head->frch_root;
404 *last = chain_frchains_together_1 (seg, head);
409 #if defined (BFD_ASSEMBLER) || !defined (BFD)
413 cvt_frag_to_fill (sec, fragP)
418 cvt_frag_to_fill (headersP, sec, fragP)
419 object_headers *headersP;
424 switch (fragP->fr_type)
431 HANDLE_ALIGN (fragP);
433 know (fragP->fr_next != NULL);
434 fragP->fr_offset = (fragP->fr_next->fr_address
436 - fragP->fr_fix) / fragP->fr_var;
437 if (fragP->fr_offset < 0)
439 as_bad ("attempt to .org/.space backwards? (%ld)",
440 (long) fragP->fr_offset);
442 fragP->fr_type = rs_fill;
448 case rs_machine_dependent:
450 md_convert_frag (stdoutput, sec, fragP);
452 md_convert_frag (headersP, sec, fragP);
455 assert (fragP->fr_next == NULL || (fragP->fr_next->fr_address - fragP->fr_address == fragP->fr_fix));
458 * After md_convert_frag, we make the frag into a ".space 0".
459 * Md_convert_frag() should set up any fixSs and constants
465 #ifndef WORKING_DOT_WORD
468 struct broken_word *lie;
470 if (fragP->fr_subtype)
472 fragP->fr_fix += md_short_jump_size;
473 for (lie = (struct broken_word *) (fragP->fr_symbol);
474 lie && lie->dispfrag == fragP;
475 lie = lie->next_broken_word)
477 fragP->fr_fix += md_long_jump_size;
485 BAD_CASE (fragP->fr_type);
490 #endif /* defined (BFD_ASSEMBLER) || !defined (BFD) */
494 relax_and_size_seg (abfd, sec, xxx)
501 segment_info_type *seginfo;
503 valueT size, newsize;
505 flags = bfd_get_section_flags (abfd, sec);
507 seginfo = seg_info (sec);
508 if (seginfo && seginfo->frchainP)
510 relax_segment (seginfo->frchainP->frch_root, sec);
511 for (fragp = seginfo->frchainP->frch_root; fragp; fragp = fragp->fr_next)
512 cvt_frag_to_fill (sec, fragp);
513 for (fragp = seginfo->frchainP->frch_root;
515 fragp = fragp->fr_next)
516 /* walk to last elt */;
517 size = fragp->fr_address + fragp->fr_fix;
522 if (size > 0 && ! seginfo->bss)
523 flags |= SEC_HAS_CONTENTS;
525 /* @@ This is just an approximation. */
526 if (seginfo && seginfo->fix_root)
530 x = bfd_set_section_flags (abfd, sec, flags);
533 newsize = md_section_align (sec, size);
534 x = bfd_set_section_size (abfd, sec, newsize);
537 /* If the size had to be rounded up, add some padding in the last
539 assert (newsize >= size);
542 fragS *last = seginfo->frchainP->frch_last;
543 fragp = seginfo->frchainP->frch_root;
544 while (fragp->fr_next != last)
545 fragp = fragp->fr_next;
546 last->fr_address = size;
547 fragp->fr_offset += newsize - size;
550 #ifdef tc_frob_section
551 tc_frob_section (sec);
553 #ifdef obj_frob_section
554 obj_frob_section (sec);
560 dump_section_relocs (abfd, sec, stream_)
565 FILE *stream = (FILE *) stream_;
566 segment_info_type *seginfo = seg_info (sec);
567 fixS *fixp = seginfo->fix_root;
572 fprintf (stream, "sec %s relocs:\n", sec->name);
575 symbolS *s = fixp->fx_addsy;
578 fprintf (stream, " %08x: %s(%s", fixp, S_GET_NAME (s),
579 s->bsym->section->name);
580 if (s->bsym->flags & BSF_SECTION_SYM)
582 fprintf (stream, " section sym");
584 fprintf (stream, "+%x", S_GET_VALUE (s));
587 fprintf (stream, "+%x", S_GET_VALUE (s));
588 fprintf (stream, ")+%x\n", fixp->fx_offset);
591 fprintf (stream, " %08x: type %d no sym\n", fixp, fixp->fx_r_type);
592 fixp = fixp->fx_next;
596 #define dump_section_relocs(ABFD,SEC,STREAM) (void)(ABFD,SEC,STREAM)
599 #ifndef EMIT_SECTION_SYMBOLS
600 #define EMIT_SECTION_SYMBOLS 1
604 adjust_reloc_syms (abfd, sec, xxx)
609 segment_info_type *seginfo = seg_info (sec);
615 dump_section_relocs (abfd, sec, stderr);
617 for (fixp = seginfo->fix_root; fixp; fixp = fixp->fx_next)
620 else if (fixp->fx_addsy)
628 fprintf (stderr, "\n\nadjusting fixup:\n");
632 sym = fixp->fx_addsy;
633 symsec = sym->bsym->section;
635 if (sym != NULL && sym->sy_mri_common)
637 /* These symbols are handled specially in fixup_segment. */
641 /* If it's one of these sections, assume the symbol is
642 definitely going to be output. The code in
643 md_estimate_size_before_relax in tc-mips.c uses this test
644 as well, so if you change this code you should look at that
646 if (bfd_is_und_section (symsec)
647 || bfd_is_abs_section (symsec)
648 || bfd_is_com_section (symsec))
650 fixp->fx_addsy->sy_used_in_reloc = 1;
651 #ifdef UNDEFINED_DIFFERENCE_OK
652 /* We have the difference of an undefined symbol and some
653 other symbol. Make sure to mark the other symbol as used
654 in a relocation so that it will always be output. */
656 fixp->fx_subsy->sy_used_in_reloc = 1;
661 /* Since we're reducing to section symbols, don't attempt to reduce
662 anything that's already using one. */
663 if (sym->bsym->flags & BSF_SECTION_SYM)
665 fixp->fx_addsy->sy_used_in_reloc = 1;
669 /* Is there some other reason we can't adjust this one? (E.g.,
670 call/bal links in i960-bout symbols.) */
671 #ifdef obj_fix_adjustable
672 if (! obj_fix_adjustable (fixp))
674 fixp->fx_addsy->sy_used_in_reloc = 1;
679 /* Is there some other (target cpu dependent) reason we can't adjust
680 this one? (E.g. relocations involving function addresses on
682 #ifdef tc_fix_adjustable
683 if (! tc_fix_adjustable (fixp))
685 fixp->fx_addsy->sy_used_in_reloc = 1;
690 /* For PIC support: We may get expressions like
691 "_GLOBAL_OFFSET_TABLE_+(.-L5)" where "." and "L5" may not
692 necessarily have had a fixed difference initially. But now
693 it should be a known constant, so we can reduce it. Since
694 we can't easily handle a symbol value that looks like
695 someUndefinedSymbol+const, though, we convert the fixup to
696 access the undefined symbol directly, and discard the
697 intermediate symbol. */
698 if (S_GET_SEGMENT (sym) == expr_section
699 && sym->sy_value.X_op == O_add
700 && (resolve_symbol_value (sym->sy_value.X_add_symbol),
701 S_GET_SEGMENT (sym->sy_value.X_add_symbol) == undefined_section)
702 && (resolve_symbol_value (sym->sy_value.X_op_symbol),
703 S_GET_SEGMENT (sym->sy_value.X_op_symbol) == absolute_section))
705 fixp->fx_offset += S_GET_VALUE (sym->sy_value.X_op_symbol);
706 fixp->fx_offset += sym->sy_value.X_add_number;
707 fixp->fx_addsy = sym->sy_value.X_add_symbol;
711 /* If the section symbol isn't going to be output, the relocs
712 at least should still work. If not, figure out what to do
713 when we run into that case. */
714 fixp->fx_offset += S_GET_VALUE (sym);
715 fixp->fx_addsy = section_symbol (symsec);
716 fixp->fx_addsy->sy_used_in_reloc = 1;
721 #if 1/*def RELOC_REQUIRES_SYMBOL*/
724 /* There was no symbol required by this relocation. However,
725 BFD doesn't really handle relocations without symbols well.
726 (At least, the COFF support doesn't.) So for now we fake up
727 a local symbol in the absolute section. */
729 fixp->fx_addsy = section_symbol (absolute_section);
730 /* fixp->fx_addsy->sy_used_in_reloc = 1; */
734 dump_section_relocs (abfd, sec, stderr);
738 write_relocs (abfd, sec, xxx)
743 segment_info_type *seginfo = seg_info (sec);
750 /* If seginfo is NULL, we did not create this section; don't do
755 fixup_segment (seginfo->fix_root, sec);
758 for (fixp = seginfo->fix_root; fixp; fixp = fixp->fx_next)
761 #ifndef RELOC_EXPANSION_POSSIBLE
762 /* Set up reloc information as well. */
763 relocs = (arelent **) bfd_alloc_by_size_t (stdoutput,
764 n * sizeof (arelent *));
765 memset ((char*)relocs, 0, n * sizeof (arelent*));
768 for (fixp = seginfo->fix_root; fixp != (fixS *) NULL; fixp = fixp->fx_next)
771 bfd_reloc_status_type s;
778 reloc = tc_gen_reloc (sec, fixp);
784 if (fixp->fx_where + fixp->fx_size
785 > fixp->fx_frag->fr_fix + fixp->fx_frag->fr_offset)
788 s = bfd_install_relocation (stdoutput, reloc,
789 fixp->fx_frag->fr_literal,
790 fixp->fx_frag->fr_address,
796 case bfd_reloc_overflow:
797 as_bad_where (fixp->fx_file, fixp->fx_line, "relocation overflow");
800 as_fatal ("%s:%u: bad return from bfd_perform_relocation",
801 fixp->fx_file, fixp->fx_line);
806 n = n * MAX_RELOC_EXPANSION;
807 /* Set up reloc information as well. */
808 relocs = (arelent **) bfd_alloc_by_size_t (stdoutput,
809 n * sizeof (arelent *));
812 for (fixp = seginfo->fix_root; fixp != (fixS *) NULL; fixp = fixp->fx_next)
816 bfd_reloc_status_type s;
824 reloc = tc_gen_reloc (sec, fixp);
826 for (j = 0; reloc[j]; j++)
828 relocs[i++] = reloc[j];
831 data = fixp->fx_frag->fr_literal + fixp->fx_where;
832 if (fixp->fx_where + fixp->fx_size
833 > fixp->fx_frag->fr_fix + fixp->fx_frag->fr_offset)
835 for (j = 0; reloc[j]; j++)
837 s = bfd_install_relocation (stdoutput, reloc[j],
838 fixp->fx_frag->fr_literal,
839 fixp->fx_frag->fr_address,
845 case bfd_reloc_overflow:
846 as_bad_where (fixp->fx_file, fixp->fx_line,
847 "relocation overflow");
850 as_fatal ("%s:%u: bad return from bfd_perform_relocation",
851 fixp->fx_file, fixp->fx_line);
862 sympp = bfd_get_outsymbols (stdoutput);
863 nsyms = bfd_get_symcount (stdoutput);
864 for (i = 0; i < n; i++)
865 if (((*relocs[i]->sym_ptr_ptr)->flags & BSF_SECTION_SYM) == 0)
867 for (j = 0; j < nsyms; j++)
868 if (sympp[j] == *relocs[i]->sym_ptr_ptr)
877 bfd_set_reloc (stdoutput, sec, relocs, n);
879 bfd_set_section_flags (abfd, sec,
880 (bfd_get_section_flags (abfd, sec)
881 & (flagword) ~SEC_RELOC));
888 fprintf (stderr, "relocs for sec %s\n", sec->name);
889 for (i = 0; i < n; i++)
893 fprintf (stderr, " reloc %2d @%08x off %4x : sym %-10s addend %x\n",
894 i, r, r->address, s->name, r->addend);
901 write_contents (abfd, sec, xxx)
906 segment_info_type *seginfo = seg_info (sec);
907 unsigned long offset = 0;
910 /* Write out the frags. */
912 || ! (bfd_get_section_flags (abfd, sec) & SEC_HAS_CONTENTS))
915 for (f = seginfo->frchainP->frch_root;
920 unsigned long fill_size;
924 assert (f->fr_type == rs_fill);
927 x = bfd_set_section_contents (stdoutput, sec,
928 f->fr_literal, (file_ptr) offset,
929 (bfd_size_type) f->fr_fix);
932 bfd_perror (stdoutput->filename);
933 as_perror ("FATAL: Can't write %s", stdoutput->filename);
938 fill_literal = f->fr_literal + f->fr_fix;
939 fill_size = f->fr_var;
940 count = f->fr_offset;
942 if (fill_size && count)
945 if (fill_size > sizeof(buf))
947 /* Do it the old way. Can this ever happen? */
950 x = bfd_set_section_contents (stdoutput, sec,
953 (bfd_size_type) fill_size);
956 bfd_perror (stdoutput->filename);
957 as_perror ("FATAL: Can't write %s", stdoutput->filename);
965 /* Build a buffer full of fill objects and output it as
966 often as necessary. This saves on the overhead of
967 potentially lots of bfd_set_section_contents calls. */
971 n_per_buf = sizeof (buf);
972 memset (buf, *fill_literal, n_per_buf);
977 n_per_buf = sizeof(buf)/fill_size;
978 for (i = n_per_buf, bufp = buf; i; i--, bufp += fill_size)
979 memcpy(bufp, fill_literal, fill_size);
981 for (; count > 0; count -= n_per_buf)
983 n_per_buf = n_per_buf > count ? count : n_per_buf;
984 x = bfd_set_section_contents (stdoutput, sec,
985 buf, (file_ptr) offset,
986 (bfd_size_type) n_per_buf * fill_size);
988 as_fatal ("Cannot write to output file.");
989 offset += n_per_buf * fill_size;
997 #if defined(BFD_ASSEMBLER) || (!defined (BFD) && !defined(OBJ_AOUT))
999 merge_data_into_text ()
1001 #if defined(BFD_ASSEMBLER) || defined(MANY_SEGMENTS)
1002 seg_info (text_section)->frchainP->frch_last->fr_next =
1003 seg_info (data_section)->frchainP->frch_root;
1004 seg_info (text_section)->frchainP->frch_last =
1005 seg_info (data_section)->frchainP->frch_last;
1006 seg_info (data_section)->frchainP = 0;
1010 text_last_frag->fr_next = data_frag_root;
1011 text_last_frag = data_last_frag;
1012 data_last_frag = NULL;
1013 data_frag_root = NULL;
1016 for (tmp = text_fix_root; tmp->fx_next; tmp = tmp->fx_next);;
1017 tmp->fx_next = data_fix_root;
1018 text_fix_tail = data_fix_tail;
1021 text_fix_root = data_fix_root;
1022 data_fix_root = NULL;
1025 #endif /* BFD_ASSEMBLER || (! BFD && ! OBJ_AOUT) */
1027 #if !defined (BFD_ASSEMBLER) && !defined (BFD)
1029 relax_and_size_all_segments ()
1033 relax_segment (text_frag_root, SEG_TEXT);
1034 relax_segment (data_frag_root, SEG_DATA);
1035 relax_segment (bss_frag_root, SEG_BSS);
1037 * Now the addresses of frags are correct within the segment.
1040 know (text_last_frag->fr_type == rs_fill && text_last_frag->fr_offset == 0);
1041 H_SET_TEXT_SIZE (&headers, text_last_frag->fr_address);
1042 text_last_frag->fr_address = H_GET_TEXT_SIZE (&headers);
1045 * Join the 2 segments into 1 huge segment.
1046 * To do this, re-compute every rn_address in the SEG_DATA frags.
1047 * Then join the data frags after the text frags.
1049 * Determine a_data [length of data segment].
1053 register relax_addressT slide;
1055 know ((text_last_frag->fr_type == rs_fill) && (text_last_frag->fr_offset == 0));
1057 H_SET_DATA_SIZE (&headers, data_last_frag->fr_address);
1058 data_last_frag->fr_address = H_GET_DATA_SIZE (&headers);
1059 slide = H_GET_TEXT_SIZE (&headers); /* & in file of the data segment. */
1061 #define RoundUp(N,S) (((N)+(S)-1)&-(S))
1062 /* For b.out: If the data section has a strict alignment
1063 requirement, its load address in the .o file will be
1064 rounded up from the size of the text section. These
1065 two values are *not* the same! Similarly for the bss
1067 slide = RoundUp (slide, 1 << section_alignment[SEG_DATA]);
1070 for (fragP = data_frag_root; fragP; fragP = fragP->fr_next)
1072 fragP->fr_address += slide;
1073 } /* for each data frag */
1075 know (text_last_frag != 0);
1076 text_last_frag->fr_next = data_frag_root;
1080 H_SET_DATA_SIZE (&headers, 0);
1084 /* See above comments on b.out data section address. */
1087 if (data_last_frag == 0)
1088 bss_vma = H_GET_TEXT_SIZE (&headers);
1090 bss_vma = data_last_frag->fr_address;
1091 bss_vma = RoundUp (bss_vma, 1 << section_alignment[SEG_BSS]);
1092 bss_address_frag.fr_address = bss_vma;
1094 #else /* ! OBJ_BOUT */
1095 bss_address_frag.fr_address = (H_GET_TEXT_SIZE (&headers) +
1096 H_GET_DATA_SIZE (&headers));
1098 #endif /* ! OBJ_BOUT */
1100 /* Slide all the frags */
1103 relax_addressT slide = bss_address_frag.fr_address;
1105 for (fragP = bss_frag_root; fragP; fragP = fragP->fr_next)
1107 fragP->fr_address += slide;
1108 } /* for each bss frag */
1112 H_SET_BSS_SIZE (&headers,
1113 bss_last_frag->fr_address - bss_frag_root->fr_address);
1115 H_SET_BSS_SIZE (&headers, 0);
1117 #endif /* ! BFD_ASSEMBLER && ! BFD */
1119 #if defined (BFD_ASSEMBLER) || !defined (BFD)
1121 #ifdef BFD_ASSEMBLER
1129 extern PTR bfd_alloc PARAMS ((bfd *, size_t));
1131 /* Count symbols. We can't rely on a count made by the loop in
1132 write_object_file, because *_frob_file may add a new symbol or
1135 for (symp = symbol_rootP; symp; symp = symbol_next (symp))
1142 asympp = (asymbol **) bfd_alloc (stdoutput,
1143 nsyms * sizeof (asymbol *));
1144 symp = symbol_rootP;
1145 for (i = 0; i < nsyms; i++, symp = symbol_next (symp))
1147 asympp[i] = symp->bsym;
1153 result = bfd_set_symtab (stdoutput, asympp, nsyms);
1154 assert (result == true);
1155 symbol_table_frozen = 1;
1160 write_object_file ()
1162 struct frchain *frchainP; /* Track along all frchains. */
1163 #if ! defined (BFD_ASSEMBLER) || ! defined (WORKING_DOT_WORD)
1164 fragS *fragP; /* Track along all frags. */
1167 /* Do we really want to write it? */
1169 int n_warns, n_errs;
1170 n_warns = had_warnings ();
1171 n_errs = had_errors ();
1172 /* The -Z flag indicates that an object file should be generated,
1173 regardless of warnings and errors. */
1174 if (flag_always_generate_output)
1176 if (n_warns || n_errs)
1177 as_warn ("%d error%s, %d warning%s, generating bad object file.\n",
1178 n_errs, n_errs == 1 ? "" : "s",
1179 n_warns, n_warns == 1 ? "" : "s");
1184 as_fatal ("%d error%s, %d warning%s, no object file generated.\n",
1185 n_errs, n_errs == 1 ? "" : "s",
1186 n_warns, n_warns == 1 ? "" : "s");
1191 /* Under VMS we try to be compatible with VAX-11 "C". Thus, we call
1192 a routine to check for the definition of the procedure "_main",
1193 and if so -- fix it up so that it can be program entry point. */
1194 vms_check_for_main ();
1195 #endif /* OBJ_VMS */
1197 /* After every sub-segment, we fake an ".align ...". This conforms to
1198 BSD4.2 brane-damage. We then fake ".fill 0" because that is the kind of
1199 frag that requires least thought. ".align" frags like to have a
1200 following frag since that makes calculating their intended length
1203 @@ Is this really necessary?? */
1204 #ifndef SUB_SEGMENT_ALIGN
1205 #ifdef BFD_ASSEMBLER
1206 #define SUB_SEGMENT_ALIGN(SEG) (0)
1208 #define SUB_SEGMENT_ALIGN(SEG) (2)
1211 for (frchainP = frchain_root; frchainP; frchainP = frchainP->frch_next)
1213 subseg_set (frchainP->frch_seg, frchainP->frch_subseg);
1214 frag_align (SUB_SEGMENT_ALIGN (now_seg), NOP_OPCODE);
1215 /* frag_align will have left a new frag.
1216 Use this last frag for an empty ".fill".
1218 For this segment ...
1219 Create a last frag. Do not leave a "being filled in frag". */
1220 frag_wane (frag_now);
1221 frag_now->fr_fix = 0;
1222 know (frag_now->fr_next == NULL);
1225 /* From now on, we don't care about sub-segments. Build one frag chain
1226 for each segment. Linked thru fr_next. */
1228 #ifdef BFD_ASSEMBLER
1229 /* Remove the sections created by gas for its own purposes. */
1231 asection **seclist, *sec;
1234 seclist = &stdoutput->sections;
1235 while (seclist && *seclist)
1238 while (sec == reg_section || sec == expr_section)
1242 stdoutput->section_count--;
1247 seclist = &(*seclist)->next;
1250 bfd_map_over_sections (stdoutput, renumber_sections, &i);
1253 bfd_map_over_sections (stdoutput, chain_frchains_together, (char *) 0);
1255 remove_subsegs (frchain_root, SEG_TEXT, &text_frag_root, &text_last_frag);
1256 remove_subsegs (data0_frchainP, SEG_DATA, &data_frag_root, &data_last_frag);
1257 remove_subsegs (bss0_frchainP, SEG_BSS, &bss_frag_root, &bss_last_frag);
1260 /* We have two segments. If user gave -R flag, then we must put the
1261 data frags into the text segment. Do this before relaxing so
1262 we know to take advantage of -R and make shorter addresses. */
1263 #if !defined (OBJ_AOUT) || defined (BFD_ASSEMBLER)
1264 if (flag_readonly_data_in_text)
1266 merge_data_into_text ();
1270 #ifdef BFD_ASSEMBLER
1271 bfd_map_over_sections (stdoutput, relax_and_size_seg, (char *) 0);
1273 relax_and_size_all_segments ();
1274 #endif /* BFD_ASSEMBLER */
1276 #ifndef BFD_ASSEMBLER
1279 * Crawl the symbol chain.
1281 * For each symbol whose value depends on a frag, take the address of
1282 * that frag and subsume it into the value of the symbol.
1283 * After this, there is just one way to lookup a symbol value.
1284 * Values are left in their final state for object file emission.
1285 * We adjust the values of 'L' local symbols, even if we do
1286 * not intend to emit them to the object file, because their values
1287 * are needed for fix-ups.
1289 * Unless we saw a -L flag, remove all symbols that begin with 'L'
1290 * from the symbol chain. (They are still pointed to by the fixes.)
1292 * Count the remaining symbols.
1293 * Assign a symbol number to each symbol.
1294 * Count the number of string-table chars we will emit.
1295 * Put this info into the headers as appropriate.
1298 know (zero_address_frag.fr_address == 0);
1299 string_byte_count = sizeof (string_byte_count);
1301 obj_crawl_symbol_chain (&headers);
1303 if (string_byte_count == sizeof (string_byte_count))
1304 string_byte_count = 0;
1306 H_SET_STRING_SIZE (&headers, string_byte_count);
1309 * Addresses of frags now reflect addresses we use in the object file.
1310 * Symbol values are correct.
1311 * Scan the frags, converting any ".org"s and ".align"s to ".fill"s.
1312 * Also converting any machine-dependent frags using md_convert_frag();
1314 subseg_change (SEG_TEXT, 0);
1316 for (fragP = text_frag_root; fragP; fragP = fragP->fr_next)
1318 cvt_frag_to_fill (&headers, SEG_TEXT, fragP);
1320 /* Some assert macros don't work with # directives mixed in. */
1322 if (!(fragP->fr_next == NULL
1324 || fragP->fr_next == data_frag_root
1326 || ((fragP->fr_next->fr_address - fragP->fr_address)
1327 == (fragP->fr_fix + fragP->fr_offset * fragP->fr_var))))
1331 #endif /* ! BFD_ASSEMBLER */
1333 #ifndef WORKING_DOT_WORD
1335 struct broken_word *lie;
1336 struct broken_word **prevP;
1338 prevP = &broken_words;
1339 for (lie = broken_words; lie; lie = lie->next_broken_word)
1344 exp.X_op = O_subtract;
1345 exp.X_add_symbol = lie->add;
1346 exp.X_op_symbol = lie->sub;
1347 exp.X_add_number = lie->addnum;
1348 #ifdef BFD_ASSEMBLER
1349 #ifdef TC_CONS_FIX_NEW
1350 TC_CONS_FIX_NEW (lie->frag,
1351 lie->word_goes_here - lie->frag->fr_literal,
1354 fix_new_exp (lie->frag,
1355 lie->word_goes_here - lie->frag->fr_literal,
1356 2, &exp, 0, BFD_RELOC_NONE);
1359 #if defined(TC_SPARC) || defined(TC_A29K) || defined(NEED_FX_R_TYPE)
1360 fix_new_exp (lie->frag,
1361 lie->word_goes_here - lie->frag->fr_literal,
1362 2, &exp, 0, NO_RELOC);
1365 fix_new_ns32k_exp (lie->frag,
1366 lie->word_goes_here - lie->frag->fr_literal,
1367 2, &exp, 0, 0, 2, 0, 0);
1369 fix_new_exp (lie->frag,
1370 lie->word_goes_here - lie->frag->fr_literal,
1372 #endif /* TC_NS32K */
1373 #endif /* TC_SPARC|TC_A29K|NEED_FX_R_TYPE */
1374 #endif /* BFD_ASSEMBLER */
1375 *prevP = lie->next_broken_word;
1378 prevP = &(lie->next_broken_word);
1380 for (lie = broken_words; lie;)
1382 struct broken_word *untruth;
1384 addressT table_addr;
1385 addressT from_addr, to_addr;
1388 fragP = lie->dispfrag;
1390 /* Find out how many broken_words go here. */
1392 for (untruth = lie; untruth && untruth->dispfrag == fragP; untruth = untruth->next_broken_word)
1393 if (untruth->added == 1)
1396 table_ptr = lie->dispfrag->fr_opcode;
1397 table_addr = lie->dispfrag->fr_address + (table_ptr - lie->dispfrag->fr_literal);
1398 /* Create the jump around the long jumps. This is a short
1399 jump from table_ptr+0 to table_ptr+n*long_jump_size. */
1400 from_addr = table_addr;
1401 to_addr = table_addr + md_short_jump_size + n * md_long_jump_size;
1402 md_create_short_jump (table_ptr, from_addr, to_addr, lie->dispfrag, lie->add);
1403 table_ptr += md_short_jump_size;
1404 table_addr += md_short_jump_size;
1406 for (m = 0; lie && lie->dispfrag == fragP; m++, lie = lie->next_broken_word)
1408 if (lie->added == 2)
1410 /* Patch the jump table */
1411 /* This is the offset from ??? to table_ptr+0 */
1412 to_addr = table_addr - S_GET_VALUE (lie->sub);
1413 #ifdef BFD_ASSEMBLER
1414 to_addr -= lie->sub->sy_frag->fr_address;
1416 md_number_to_chars (lie->word_goes_here, to_addr, 2);
1417 for (untruth = lie->next_broken_word; untruth && untruth->dispfrag == fragP; untruth = untruth->next_broken_word)
1419 if (untruth->use_jump == lie)
1420 md_number_to_chars (untruth->word_goes_here, to_addr, 2);
1423 /* Install the long jump */
1424 /* this is a long jump from table_ptr+0 to the final target */
1425 from_addr = table_addr;
1426 to_addr = S_GET_VALUE (lie->add) + lie->addnum;
1427 #ifdef BFD_ASSEMBLER
1428 to_addr += lie->add->sy_frag->fr_address;
1430 md_create_long_jump (table_ptr, from_addr, to_addr, lie->dispfrag, lie->add);
1431 table_ptr += md_long_jump_size;
1432 table_addr += md_long_jump_size;
1436 #endif /* not WORKING_DOT_WORD */
1438 #ifndef BFD_ASSEMBLER
1441 char *the_object_file;
1442 long object_file_size;
1444 * Scan every FixS performing fixups. We had to wait until now to do
1445 * this because md_convert_frag() may have made some fixSs.
1449 subseg_change (SEG_TEXT, 0);
1450 trsize = md_reloc_size * fixup_segment (text_fix_root, SEG_TEXT);
1451 subseg_change (SEG_DATA, 0);
1452 drsize = md_reloc_size * fixup_segment (data_fix_root, SEG_DATA);
1453 H_SET_RELOCATION_SIZE (&headers, trsize, drsize);
1455 /* FIXME move this stuff into the pre-write-hook */
1456 H_SET_MAGIC_NUMBER (&headers, magic_number_for_object_file);
1457 H_SET_ENTRY_POINT (&headers, 0);
1459 obj_pre_write_hook (&headers); /* extra coff stuff */
1461 object_file_size = H_GET_FILE_SIZE (&headers);
1462 next_object_file_charP = the_object_file = xmalloc (object_file_size);
1464 output_file_create (out_file_name);
1466 obj_header_append (&next_object_file_charP, &headers);
1468 know ((next_object_file_charP - the_object_file) == H_GET_HEADER_SIZE (&headers));
1473 for (fragP = text_frag_root; fragP; fragP = fragP->fr_next)
1475 register long count;
1476 register char *fill_literal;
1477 register long fill_size;
1480 know (fragP->fr_type == rs_fill);
1481 append (&next_object_file_charP, fragP->fr_literal, (unsigned long) fragP->fr_fix);
1482 fill_literal = fragP->fr_literal + fragP->fr_fix;
1483 fill_size = fragP->fr_var;
1484 know (fragP->fr_offset >= 0);
1486 for (count = fragP->fr_offset; count; count--)
1488 append (&next_object_file_charP, fill_literal, (unsigned long) fill_size);
1491 } /* for each code frag. */
1493 know ((next_object_file_charP - the_object_file) == (H_GET_HEADER_SIZE (&headers) + H_GET_TEXT_SIZE (&headers) + H_GET_DATA_SIZE (&headers)));
1498 obj_emit_relocations (&next_object_file_charP, text_fix_root, (relax_addressT) 0);
1499 know ((next_object_file_charP - the_object_file) == (H_GET_HEADER_SIZE (&headers) + H_GET_TEXT_SIZE (&headers) + H_GET_DATA_SIZE (&headers) + H_GET_TEXT_RELOCATION_SIZE (&headers)));
1501 /* Make addresses in data relocation directives relative to beginning of
1502 * first data fragment, not end of last text fragment: alignment of the
1503 * start of the data segment may place a gap between the segments.
1505 obj_emit_relocations (&next_object_file_charP, data_fix_root, data0_frchainP->frch_root->fr_address);
1507 obj_emit_relocations (&next_object_file_charP, data_fix_root, text_last_frag->fr_address);
1508 #endif /* TC_I960 */
1510 know ((next_object_file_charP - the_object_file) == (H_GET_HEADER_SIZE (&headers) + H_GET_TEXT_SIZE (&headers) + H_GET_DATA_SIZE (&headers) + H_GET_TEXT_RELOCATION_SIZE (&headers) + H_GET_DATA_RELOCATION_SIZE (&headers)));
1513 * Emit line number entries.
1515 OBJ_EMIT_LINENO (&next_object_file_charP, lineno_rootP, the_object_file);
1516 know ((next_object_file_charP - the_object_file) == (H_GET_HEADER_SIZE (&headers) + H_GET_TEXT_SIZE (&headers) + H_GET_DATA_SIZE (&headers) + H_GET_TEXT_RELOCATION_SIZE (&headers) + H_GET_DATA_RELOCATION_SIZE (&headers) + H_GET_LINENO_SIZE (&headers)));
1521 obj_emit_symbols (&next_object_file_charP, symbol_rootP);
1522 know ((next_object_file_charP - the_object_file) == (H_GET_HEADER_SIZE (&headers) + H_GET_TEXT_SIZE (&headers) + H_GET_DATA_SIZE (&headers) + H_GET_TEXT_RELOCATION_SIZE (&headers) + H_GET_DATA_RELOCATION_SIZE (&headers) + H_GET_LINENO_SIZE (&headers) + H_GET_SYMBOL_TABLE_SIZE (&headers)));
1528 if (string_byte_count > 0)
1530 obj_emit_strings (&next_object_file_charP);
1531 } /* only if we have a string table */
1534 bfd_seek (stdoutput, 0, 0);
1535 bfd_write (the_object_file, 1, object_file_size, stdoutput);
1538 /* Write the data to the file */
1539 output_file_append (the_object_file, object_file_size, out_file_name);
1540 free (the_object_file);
1542 } /* non vms output */
1545 * Now do the VMS-dependent part of writing the object file
1547 vms_write_object_file (H_GET_TEXT_SIZE (&headers),
1548 H_GET_DATA_SIZE (&headers),
1549 H_GET_BSS_SIZE (&headers),
1550 text_frag_root, data_frag_root);
1551 #endif /* OBJ_VMS */
1552 #else /* BFD_ASSEMBLER */
1554 /* Resolve symbol values. This needs to be done before processing
1560 for (symp = symbol_rootP; symp; symp = symbol_next (symp))
1561 if (!symp->sy_resolved)
1562 resolve_symbol_value (symp);
1567 bfd_map_over_sections (stdoutput, adjust_reloc_syms, (char *)0);
1569 /* Set up symbol table, and write it out. */
1574 for (symp = symbol_rootP; symp; symp = symbol_next (symp))
1579 if (symp->sy_mri_common)
1581 if (S_IS_EXTERNAL (symp))
1582 as_bad ("%s: global symbols not supported in common sections",
1584 symbol_remove (symp, &symbol_rootP, &symbol_lastP);
1588 name = S_GET_NAME (symp);
1591 const char *name2 = decode_local_label_name ((char *)S_GET_NAME (symp));
1592 /* They only differ if `name' is a fb or dollar local
1594 if (name2 != name && ! S_IS_DEFINED (symp))
1595 as_bad ("local label %s is not defined", name2);
1598 /* Do it again, because adjust_reloc_syms might introduce
1599 more symbols. They'll probably only be section symbols,
1600 but they'll still need to have the values computed. */
1601 if (! symp->sy_resolved)
1603 if (symp->sy_value.X_op == O_constant)
1605 /* This is the normal case; skip the call. */
1608 + symp->sy_frag->fr_address));
1609 symp->sy_resolved = 1;
1612 resolve_symbol_value (symp);
1615 /* So far, common symbols have been treated like undefined symbols.
1616 Put them in the common section now. */
1617 if (S_IS_DEFINED (symp) == 0
1618 && S_GET_VALUE (symp) != 0)
1619 S_SET_SEGMENT (symp, bfd_com_section_ptr);
1621 printf ("symbol `%s'\n\t@%x: value=%d flags=%x seg=%s\n",
1622 S_GET_NAME (symp), symp,
1625 segment_name (symp->bsym->section));
1628 #ifdef obj_frob_symbol
1629 obj_frob_symbol (symp, punt);
1631 #ifdef tc_frob_symbol
1632 if (! punt || symp->sy_used_in_reloc)
1633 tc_frob_symbol (symp, punt);
1636 /* If we don't want to keep this symbol, splice it out of
1637 the chain now. If EMIT_SECTION_SYMBOLS is 0, we never
1638 want section symbols. Otherwise, we skip local symbols
1639 and symbols that the frob_symbol macros told us to punt,
1640 but we keep such symbols if they are used in relocs. */
1641 if ((! EMIT_SECTION_SYMBOLS
1642 && (symp->bsym->flags & BSF_SECTION_SYM) != 0)
1643 /* Note that S_IS_EXTERN and S_IS_LOCAL are not always
1644 opposites. Sometimes the former checks flags and the
1645 latter examines the name... */
1646 || (!S_IS_EXTERN (symp)
1647 && (S_IS_LOCAL (symp) || punt)
1648 && ! symp->sy_used_in_reloc))
1650 symbol_remove (symp, &symbol_rootP, &symbol_lastP);
1651 /* After symbol_remove, symbol_next(symp) still returns
1652 the one that came after it in the chain. So we don't
1653 need to do any extra cleanup work here. */
1658 /* Make sure we really got a value for the symbol. */
1659 if (! symp->sy_resolved)
1661 as_bad ("can't resolve value for symbol \"%s\"",
1663 symp->sy_resolved = 1;
1666 /* Set the value into the BFD symbol. Up til now the value
1667 has only been kept in the gas symbolS struct. */
1668 symp->bsym->value = S_GET_VALUE (symp);
1674 /* Now do any format-specific adjustments to the symbol table, such
1675 as adding file symbols. */
1676 #ifdef obj_adjust_symtab
1677 obj_adjust_symtab ();
1680 /* Now that all the sizes are known, and contents correct, we can
1681 start writing to the file. */
1684 /* If *_frob_file changes the symbol value at this point, it is
1685 responsible for moving the changed value into symp->bsym->value
1686 as well. Hopefully all symbol value changing can be done in
1691 #ifdef obj_frob_file
1695 bfd_map_over_sections (stdoutput, write_relocs, (char *) 0);
1697 bfd_map_over_sections (stdoutput, write_contents, (char *) 0);
1698 #endif /* BFD_ASSEMBLER */
1705 * Now we have a segment, not a crowd of sub-segments, we can make fr_address
1710 * After this, all frags in this segment have addresses that are correct
1711 * within the segment. Since segments live in different file addresses,
1712 * these frag addresses may not be the same as final object-file addresses.
1715 #ifndef md_relax_frag
1717 /* Subroutines of relax_segment. */
1723 for (; f1; f1 = f1->fr_next)
1724 if (f1->fr_next == f2)
1729 #endif /* ! defined (md_relax_frag) */
1731 /* Relax_align. Advance location counter to next address that has 'alignment'
1732 lowest order bits all 0s, return size of adjustment made. */
1733 static relax_addressT
1734 relax_align (address, alignment)
1735 register relax_addressT address; /* Address now. */
1736 register int alignment; /* Alignment (binary). */
1738 relax_addressT mask;
1739 relax_addressT new_address;
1741 mask = ~((~0) << alignment);
1742 new_address = (address + mask) & (~mask);
1743 #ifdef LINKER_RELAXING_SHRINKS_ONLY
1745 /* We must provide lots of padding, so the linker can discard it
1746 when needed. The linker will not add extra space, ever. */
1747 new_address += (1 << alignment);
1749 return (new_address - address);
1753 relax_segment (segment_frag_root, segment)
1754 struct frag *segment_frag_root;
1757 register struct frag *fragP;
1758 register relax_addressT address;
1759 #if !defined (MANY_SEGMENTS) && !defined (BFD_ASSEMBLER)
1760 know (segment == SEG_DATA || segment == SEG_TEXT || segment == SEG_BSS);
1762 /* In case md_estimate_size_before_relax() wants to make fixSs. */
1763 subseg_change (segment, 0);
1765 /* For each frag in segment: count and store (a 1st guess of)
1768 for (fragP = segment_frag_root; fragP; fragP = fragP->fr_next)
1770 fragP->fr_address = address;
1771 address += fragP->fr_fix;
1773 switch (fragP->fr_type)
1776 address += fragP->fr_offset * fragP->fr_var;
1782 int offset = relax_align (address, (int) fragP->fr_offset);
1783 if (offset % fragP->fr_var != 0)
1785 as_bad ("alignment padding (%d bytes) not a multiple of %ld",
1786 offset, (long) fragP->fr_var);
1787 offset -= (offset % fragP->fr_var);
1795 /* Assume .org is nugatory. It will grow with 1st relax. */
1798 case rs_machine_dependent:
1799 address += md_estimate_size_before_relax (fragP, segment);
1802 #ifndef WORKING_DOT_WORD
1803 /* Broken words don't concern us yet */
1804 case rs_broken_word:
1809 BAD_CASE (fragP->fr_type);
1811 } /* switch(fr_type) */
1812 } /* for each frag in the segment */
1816 long stretch; /* May be any size, 0 or negative. */
1817 /* Cumulative number of addresses we have */
1818 /* relaxed this pass. */
1819 /* We may have relaxed more than one address. */
1820 long stretched; /* Have we stretched on this pass? */
1821 /* This is 'cuz stretch may be zero, when, in fact some piece of code
1822 grew, and another shrank. If a branch instruction doesn't fit anymore,
1823 we could be scrod. */
1827 stretch = stretched = 0;
1828 for (fragP = segment_frag_root; fragP; fragP = fragP->fr_next)
1831 unsigned long was_address;
1837 was_address = fragP->fr_address;
1838 address = fragP->fr_address += stretch;
1839 symbolP = fragP->fr_symbol;
1840 offset = fragP->fr_offset;
1842 switch (fragP->fr_type)
1844 case rs_fill: /* .fill never relaxes. */
1848 #ifndef WORKING_DOT_WORD
1849 /* JF: This is RMS's idea. I do *NOT* want to be blamed
1850 for it I do not want to write it. I do not want to have
1851 anything to do with it. This is not the proper way to
1852 implement this misfeature. */
1853 case rs_broken_word:
1855 struct broken_word *lie;
1856 struct broken_word *untruth;
1858 /* Yes this is ugly (storing the broken_word pointer
1859 in the symbol slot). Still, this whole chunk of
1860 code is ugly, and I don't feel like doing anything
1861 about it. Think of it as stubbornness in action. */
1863 for (lie = (struct broken_word *) (fragP->fr_symbol);
1864 lie && lie->dispfrag == fragP;
1865 lie = lie->next_broken_word)
1871 offset = (lie->add->sy_frag->fr_address
1872 + S_GET_VALUE (lie->add)
1874 - (lie->sub->sy_frag->fr_address
1875 + S_GET_VALUE (lie->sub)));
1876 if (offset <= -32768 || offset >= 32767)
1878 if (flag_warn_displacement)
1881 sprint_value (buf, (addressT) lie->addnum);
1882 as_warn (".word %s-%s+%s didn't fit",
1883 S_GET_NAME (lie->add),
1884 S_GET_NAME (lie->sub),
1888 if (fragP->fr_subtype == 0)
1890 fragP->fr_subtype++;
1891 growth += md_short_jump_size;
1893 for (untruth = lie->next_broken_word;
1894 untruth && untruth->dispfrag == lie->dispfrag;
1895 untruth = untruth->next_broken_word)
1896 if ((untruth->add->sy_frag == lie->add->sy_frag)
1897 && S_GET_VALUE (untruth->add) == S_GET_VALUE (lie->add))
1900 untruth->use_jump = lie;
1902 growth += md_long_jump_size;
1907 } /* case rs_broken_word */
1911 growth = (relax_align ((relax_addressT) (address
1914 - relax_align ((relax_addressT) (was_address
1924 #if !defined (MANY_SEGMENTS) && !defined (BFD_ASSEMBLER)
1925 know ((S_GET_SEGMENT (symbolP) == SEG_ABSOLUTE)
1926 || (S_GET_SEGMENT (symbolP) == SEG_DATA)
1927 || (S_GET_SEGMENT (symbolP) == SEG_TEXT)
1928 || S_GET_SEGMENT (symbolP) == SEG_BSS);
1929 know (symbolP->sy_frag);
1930 know (!(S_GET_SEGMENT (symbolP) == SEG_ABSOLUTE)
1931 || (symbolP->sy_frag == &zero_address_frag));
1933 target += S_GET_VALUE (symbolP)
1934 + symbolP->sy_frag->fr_address;
1935 } /* if we have a symbol */
1937 know (fragP->fr_next);
1938 after = fragP->fr_next->fr_address;
1939 growth = target - after;
1942 /* Growth may be negative, but variable part of frag
1943 cannot have fewer than 0 chars. That is, we can't
1945 as_bad ("attempt to .org backwards ignored");
1949 growth -= stretch; /* This is an absolute growth factor */
1955 growth = S_GET_VALUE (symbolP);
1956 if (symbolP->sy_frag != &zero_address_frag)
1957 as_bad (".space specifies non-absolute value");
1958 fragP->fr_symbol = 0;
1961 as_warn (".space or .fill with negative value, ignored");
1969 case rs_machine_dependent:
1970 #ifdef md_relax_frag
1971 growth = md_relax_frag (fragP, stretch);
1973 #ifdef TC_GENERIC_RELAX_TABLE
1974 /* The default way to relax a frag is to look through
1977 const relax_typeS *this_type;
1978 const relax_typeS *start_type;
1979 relax_substateT next_state;
1980 relax_substateT this_state;
1982 const relax_typeS *table = TC_GENERIC_RELAX_TABLE;
1984 this_state = fragP->fr_subtype;
1985 start_type = this_type = table + this_state;
1990 #ifndef DIFF_EXPR_OK
1991 #if !defined (MANY_SEGMENTS) && !defined (BFD_ASSEMBLER)
1992 know ((S_GET_SEGMENT (symbolP) == SEG_ABSOLUTE)
1993 || (S_GET_SEGMENT (symbolP) == SEG_DATA)
1994 || (S_GET_SEGMENT (symbolP) == SEG_BSS)
1995 || (S_GET_SEGMENT (symbolP) == SEG_TEXT));
1997 know (symbolP->sy_frag);
1999 know (!(S_GET_SEGMENT (symbolP) == absolute_section)
2000 || symbolP->sy_frag == &zero_address_frag);
2002 S_GET_VALUE (symbolP)
2003 + symbolP->sy_frag->fr_address;
2005 /* If frag has yet to be reached on this pass,
2006 assume it will move by STRETCH just as we did.
2007 If this is not so, it will be because some frag
2008 between grows, and that will force another pass.
2010 Beware zero-length frags.
2012 There should be a faster way to do this. */
2014 if (symbolP->sy_frag->fr_address >= was_address
2015 && is_dnrange (fragP, symbolP->sy_frag))
2021 aim = target - address - fragP->fr_fix;
2022 #ifdef TC_PCREL_ADJUST
2023 /* Currently only the ns32k family needs this */
2024 aim += TC_PCREL_ADJUST(fragP);
2026 /* This machine doesn't want to use pcrel_adjust.
2027 In that case, pcrel_adjust should be zero. */
2028 assert (fragP->fr_pcrel_adjust == 0);
2033 /* Look backwards. */
2034 for (next_state = this_type->rlx_more; next_state;)
2035 if (aim >= this_type->rlx_backward)
2039 /* Grow to next state. */
2040 this_state = next_state;
2041 this_type = table + this_state;
2042 next_state = this_type->rlx_more;
2047 #ifdef M68K_AIM_KLUDGE
2048 M68K_AIM_KLUDGE (aim, this_state, this_type);
2050 /* Look forwards. */
2051 for (next_state = this_type->rlx_more; next_state;)
2052 if (aim <= this_type->rlx_forward)
2056 /* Grow to next state. */
2057 this_state = next_state;
2058 this_type = table + this_state;
2059 next_state = this_type->rlx_more;
2063 growth = this_type->rlx_length - start_type->rlx_length;
2065 fragP->fr_subtype = this_state;
2067 #endif /* TC_GENERIC_RELAX_TABLE */
2072 BAD_CASE (fragP->fr_type);
2080 } /* For each frag in the segment. */
2082 while (stretched); /* Until nothing further to relax. */
2086 * We now have valid fr_address'es for each frag.
2090 * All fr_address's are correct, relative to their own segment.
2091 * We have made all the fixS we will ever make.
2093 } /* relax_segment() */
2095 #if defined (BFD_ASSEMBLER) || (!defined (BFD) && !defined (OBJ_VMS))
2097 #ifndef TC_RELOC_RTSYM_LOC_FIXUP
2098 #define TC_RELOC_RTSYM_LOC_FIXUP(X) (1)
2103 Go through all the fixS's in a segment and see which ones can be
2104 handled now. (These consist of fixS where we have since discovered
2105 the value of a symbol, or the address of the frag involved.)
2106 For each one, call md_apply_fix to put the fix into the frag data.
2108 Result is a count of how many relocation structs will be needed to
2109 handle the remaining fixS's that we couldn't completely handle here.
2110 These will be output later by emit_relocations(). */
2113 fixup_segment (fixP, this_segment_type)
2114 register fixS *fixP;
2115 segT this_segment_type; /* N_TYPE bits for segment. */
2117 long seg_reloc_count = 0;
2118 symbolS *add_symbolP;
2119 symbolS *sub_symbolP;
2126 segT add_symbol_segment = absolute_section;
2128 /* If the linker is doing the relaxing, we must not do any fixups.
2130 Well, strictly speaking that's not true -- we could do any that are
2131 PC-relative and don't cross regions that could change size. And for the
2132 i960 (the only machine for which we've got a relaxing linker right now),
2133 we might be able to turn callx/callj into bal anyways in cases where we
2134 know the maximum displacement. */
2137 for (; fixP; fixP = fixP->fx_next)
2139 TC_ADJUST_RELOC_COUNT (fixP, seg_reloc_count);
2140 return seg_reloc_count;
2143 for (; fixP; fixP = fixP->fx_next)
2146 fprintf (stderr, "\nprocessing fixup:\n");
2150 fragP = fixP->fx_frag;
2152 where = fixP->fx_where;
2153 place = fragP->fr_literal + where;
2154 size = fixP->fx_size;
2155 add_symbolP = fixP->fx_addsy;
2156 #ifdef TC_VALIDATE_FIX
2157 TC_VALIDATE_FIX (fixP, this_segment_type, skip);
2159 sub_symbolP = fixP->fx_subsy;
2160 add_number = fixP->fx_offset;
2161 pcrel = fixP->fx_pcrel;
2164 if (add_symbolP != NULL
2165 && add_symbolP->sy_mri_common)
2167 know (add_symbolP->sy_value.X_op == O_symbol);
2168 add_number += S_GET_VALUE (add_symbolP);
2169 fixP->fx_offset = add_number;
2170 add_symbolP = fixP->fx_addsy = add_symbolP->sy_value.X_add_symbol;
2174 add_symbol_segment = S_GET_SEGMENT (add_symbolP);
2178 resolve_symbol_value (sub_symbolP);
2182 if (S_GET_SEGMENT (sub_symbolP) == absolute_section)
2183 add_number -= S_GET_VALUE (sub_symbolP);
2185 && S_GET_SEGMENT (sub_symbolP) == this_segment_type)
2187 /* Should try converting to a constant. */
2192 as_bad_where (fixP->fx_file, fixP->fx_line,
2193 "Negative of non-absolute symbol %s",
2194 S_GET_NAME (sub_symbolP));
2196 else if ((S_GET_SEGMENT (sub_symbolP) == add_symbol_segment)
2197 && (SEG_NORMAL (add_symbol_segment)
2198 || (add_symbol_segment == absolute_section)))
2200 /* Difference of 2 symbols from same segment.
2201 Can't make difference of 2 undefineds: 'value' means
2202 something different for N_UNDF. */
2204 /* Makes no sense to use the difference of 2 arbitrary symbols
2205 as the target of a call instruction. */
2207 as_bad_where (fixP->fx_file, fixP->fx_line,
2208 "callj to difference of 2 symbols");
2209 #endif /* TC_I960 */
2210 add_number += S_GET_VALUE (add_symbolP) -
2211 S_GET_VALUE (sub_symbolP);
2214 pcrel = 0; /* No further pcrel processing. */
2216 /* Let the target machine make the final determination
2217 as to whether or not a relocation will be needed to
2218 handle this fixup. */
2219 if (!TC_FORCE_RELOCATION (fixP))
2222 fixP->fx_addsy = NULL;
2227 /* Different segments in subtraction. */
2228 know (!(S_IS_EXTERNAL (sub_symbolP)
2229 && (S_GET_SEGMENT (sub_symbolP) == absolute_section)));
2231 if ((S_GET_SEGMENT (sub_symbolP) == absolute_section))
2232 add_number -= S_GET_VALUE (sub_symbolP);
2235 else if (S_GET_SEGMENT (sub_symbolP) == this_segment_type
2236 #if 0 /* Do this even if it's already described as pc-relative. For example,
2237 on the m68k, an operand of "pc@(foo-.-2)" should address "foo" in a
2238 pc-relative mode. */
2243 /* Make it pc-relative. */
2244 add_number += (md_pcrel_from (fixP)
2245 - S_GET_VALUE (sub_symbolP));
2252 #ifdef UNDEFINED_DIFFERENCE_OK
2253 /* The PA needs this for PIC code generation. We basically
2254 don't want to do anything if we have the difference of two
2255 symbols at this point. */
2258 /* Leave it alone. */
2261 #ifdef BFD_ASSEMBLER
2262 else if (fixP->fx_r_type == BFD_RELOC_GPREL32
2263 || fixP->fx_r_type == BFD_RELOC_GPREL16)
2265 /* Leave it alone. */
2271 sprint_value (buf, fragP->fr_address + where);
2272 as_bad_where (fixP->fx_file, fixP->fx_line,
2273 "Can't emit reloc {- %s-seg symbol \"%s\"} @ file address %s.",
2274 segment_name (S_GET_SEGMENT (sub_symbolP)),
2275 S_GET_NAME (sub_symbolP), buf);
2282 if (add_symbol_segment == this_segment_type && pcrel && !plt
2283 && TC_RELOC_RTSYM_LOC_FIXUP (fixP))
2286 * This fixup was made when the symbol's segment was
2287 * SEG_UNKNOWN, but it is now in the local segment.
2288 * So we know how to do the address without relocation.
2291 /* reloc_callj() may replace a 'call' with a 'calls' or a
2292 'bal', in which cases it modifies *fixP as appropriate.
2293 In the case of a 'calls', no further work is required,
2294 and *fixP has been set up to make the rest of the code
2297 #endif /* TC_I960 */
2299 add_number += S_GET_VALUE (add_symbolP);
2300 add_number -= md_pcrel_from (fixP);
2301 pcrel = 0; /* Lie. Don't want further pcrel processing. */
2303 /* Let the target machine make the final determination
2304 as to whether or not a relocation will be needed to
2305 handle this fixup. */
2306 if (!TC_FORCE_RELOCATION (fixP))
2309 fixP->fx_addsy = NULL;
2314 if (add_symbol_segment == absolute_section)
2317 /* See comment about reloc_callj() above. */
2319 #endif /* TC_I960 */
2320 add_number += S_GET_VALUE (add_symbolP);
2322 /* Let the target machine make the final determination
2323 as to whether or not a relocation will be needed to
2324 handle this fixup. */
2326 if (TC_FORCE_RELOCATION (fixP))
2328 fixP->fx_addsy = NULL;
2332 else if (add_symbol_segment == undefined_section
2333 #ifdef BFD_ASSEMBLER
2334 || bfd_is_com_section (add_symbol_segment)
2339 if ((int) fixP->fx_bit_fixP == 13)
2341 /* This is a COBR instruction. They have only a
2342 * 13-bit displacement and are only to be used
2343 * for local branches: flag as error, don't generate
2346 as_bad_where (fixP->fx_file, fixP->fx_line,
2347 "can't use COBR format with external label");
2348 fixP->fx_addsy = NULL;
2352 #endif /* TC_I960 */
2356 if (S_IS_COMMON (add_symbolP))
2357 add_number += S_GET_VALUE (add_symbolP);
2358 #endif /* TE_I386AIX */
2359 #endif /* OBJ_COFF */
2365 #if !defined (TC_I386) || !(defined (OBJ_ELF) || defined (OBJ_COFF))
2366 add_number += S_GET_VALUE (add_symbolP);
2374 add_number -= md_pcrel_from (fixP);
2375 if (add_symbolP == 0)
2377 #ifndef BFD_ASSEMBLER
2378 fixP->fx_addsy = &abs_symbol;
2380 fixP->fx_addsy = section_symbol (absolute_section);
2382 fixP->fx_addsy->sy_used_in_reloc = 1;
2387 if (!fixP->fx_bit_fixP && !fixP->fx_no_overflow && size > 0)
2390 if (size < sizeof (mask))
2392 /* set all bits to one */
2394 /* Technically, combining these produces an undefined result
2395 if size is sizeof (valueT), though I think these two
2396 half-way operations should both be defined. And the
2397 compiler should be able to combine them if it's valid on
2398 the host architecture. */
2401 if ((add_number & mask) != 0
2402 && (add_number & mask) != mask)
2404 char buf[50], buf2[50];
2405 sprint_value (buf, fragP->fr_address + where);
2406 if (add_number > 1000)
2407 sprint_value (buf2, add_number);
2409 sprintf (buf2, "%ld", (long) add_number);
2410 as_bad_where (fixP->fx_file, fixP->fx_line,
2411 "Value of %s too large for field of %d bytes at %s",
2413 } /* generic error checking */
2415 #ifdef WARN_SIGNED_OVERFLOW_WORD
2416 /* Warn if a .word value is too large when treated as a signed
2417 number. We already know it is not too negative. This is to
2418 catch over-large switches generated by gcc on the 68k. */
2419 if (!flag_signed_overflow_ok
2421 && add_number > 0x7fff)
2422 as_bad_where (fixP->fx_file, fixP->fx_line,
2423 "Signed .word overflow; switch may be too large; %ld at 0x%lx",
2425 (unsigned long) (fragP->fr_address + where));
2427 } /* not a bit fix */
2431 #ifdef MD_APPLY_FIX3
2432 md_apply_fix3 (fixP, &add_number, this_segment_type);
2434 #ifdef BFD_ASSEMBLER
2435 md_apply_fix (fixP, &add_number);
2437 md_apply_fix (fixP, add_number);
2441 #ifndef TC_HANDLES_FX_DONE
2442 /* If the tc-* files haven't been converted, assume it's handling
2443 it the old way, where a null fx_addsy means that the fix has
2444 been applied completely, and no further work is needed. */
2445 if (fixP->fx_addsy == 0 && fixP->fx_pcrel == 0)
2449 #ifdef TC_VALIDATE_FIX
2453 fprintf (stderr, "result:\n");
2456 } /* For each fixS in this segment. */
2458 TC_ADJUST_RELOC_COUNT (fixP, seg_reloc_count);
2459 return seg_reloc_count;
2462 #endif /* defined (BFD_ASSEMBLER) || (!defined (BFD) && !defined (OBJ_VMS)) */
2465 number_to_chars_bigendian (buf, val, n)
2470 if (n > sizeof (val)|| n <= 0)
2474 buf[n] = val & 0xff;
2480 number_to_chars_littleendian (buf, val, n)
2485 if (n > sizeof (val) || n <= 0)
2489 *buf++ = val & 0xff;
2495 extern int indent_level;
2496 extern void print_symbol_value_1 ();
2503 fprintf (stderr, "fix %lx %s:%d", (long) fixp, fixp->fx_file, fixp->fx_line);
2505 fprintf (stderr, " pcrel");
2506 if (fixp->fx_pcrel_adjust)
2507 fprintf (stderr, " pcrel_adjust=%d", fixp->fx_pcrel_adjust);
2508 if (fixp->fx_im_disp)
2511 fprintf (stderr, " im_disp=%d", fixp->fx_im_disp);
2513 fprintf (stderr, " im_disp");
2517 fprintf (stderr, " tcbit");
2519 fprintf (stderr, " done");
2520 fprintf (stderr, "\n size=%d frag=%lx where=%ld offset=%lx addnumber=%lx",
2521 fixp->fx_size, (long) fixp->fx_frag, (long) fixp->fx_where,
2522 (long) fixp->fx_offset, (long) fixp->fx_addnumber);
2523 #ifdef BFD_ASSEMBLER
2524 fprintf (stderr, "\n %s (%d)", bfd_get_reloc_code_name (fixp->fx_r_type),
2527 #ifdef NEED_FX_R_TYPE
2528 fprintf (stderr, " r_type=%d", fixp->fx_r_type);
2533 fprintf (stderr, "\n +<");
2534 print_symbol_value_1 (stderr, fixp->fx_addsy);
2535 fprintf (stderr, ">");
2539 fprintf (stderr, "\n -<");
2540 print_symbol_value_1 (stderr, fixp->fx_subsy);
2541 fprintf (stderr, ">");
2543 fprintf (stderr, "\n");
2546 /* end of write.c */