1 /* write.c - emit .o file
2 Copyright (C) 1986, 1987, 1990, 1991, 1992, 1993 Free Software Foundation, Inc.
4 This file is part of GAS, the GNU Assembler.
6 GAS is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2, or (at your option)
11 GAS is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with GAS; see the file COPYING. If not, write to
18 the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
20 /* This thing should be set up to do byteordering correctly. But... */
25 #include "output-file.h"
27 /* The NOP_OPCODE is for the alignment fill value. Fill it with a nop
28 instruction so that the disassembler does not choke on it. */
30 #define NOP_OPCODE 0x00
33 #ifndef TC_ADJUST_RELOC_COUNT
34 #define TC_ADJUST_RELOC_COUNT(FIXP,COUNT)
37 #ifndef TC_FORCE_RELOCATION
38 #define TC_FORCE_RELOCATION(FIXP) 0
41 #ifndef WORKING_DOT_WORD
42 extern CONST int md_short_jump_size;
43 extern CONST int md_long_jump_size;
49 struct frag *text_frag_root;
50 struct frag *data_frag_root;
51 struct frag *bss_frag_root;
53 struct frag *text_last_frag; /* Last frag in segment. */
54 struct frag *data_last_frag; /* Last frag in segment. */
55 static struct frag *bss_last_frag; /* Last frag in segment. */
58 #if ! defined (BFD_ASSEMBLER) && ! defined (BFD)
59 static object_headers headers;
60 static char *the_object_file;
63 long string_byte_count;
64 char *next_object_file_charP; /* Tracks object file bytes. */
67 int magic_number_for_object_file = DEFAULT_MAGIC_NUMBER_FOR_OBJECT_FILE;
70 #endif /* BFD_ASSEMBLER */
73 static fixS *fix_new_internal PARAMS ((fragS *, int where, int size,
74 symbolS *add, symbolS *sub,
75 offsetT offset, int pcrel,
76 bfd_reloc_code_real_type r_type));
78 static fixS *fix_new_internal PARAMS ((fragS *, int where, int size,
79 symbolS *add, symbolS *sub,
80 offsetT offset, int pcrel,
83 #if defined (BFD_ASSEMBLER) || !defined (BFD)
84 static long fixup_segment PARAMS ((fixS * fixP, segT this_segment_type));
86 static relax_addressT relax_align PARAMS ((relax_addressT addr, int align));
91 * Create a fixS in obstack 'notes'.
94 fix_new_internal (frag, where, size, add_symbol, sub_symbol, offset, pcrel,
96 fragS *frag; /* Which frag? */
97 int where; /* Where in that frag? */
98 int size; /* 1, 2, or 4 usually. */
99 symbolS *add_symbol; /* X_add_symbol. */
100 symbolS *sub_symbol; /* X_op_symbol. */
101 offsetT offset; /* X_add_number. */
102 int pcrel; /* TRUE if PC-relative relocation. */
104 bfd_reloc_code_real_type r_type; /* Relocation type */
106 int r_type; /* Relocation type */
111 fixP = (fixS *) obstack_alloc (¬es, sizeof (fixS));
113 fixP->fx_frag = frag;
114 fixP->fx_where = where;
115 fixP->fx_size = size;
116 fixP->fx_addsy = add_symbol;
117 fixP->fx_subsy = sub_symbol;
118 fixP->fx_offset = offset;
119 fixP->fx_pcrel = pcrel;
120 #if defined(NEED_FX_R_TYPE) || defined (BFD_ASSEMBLER)
121 fixP->fx_r_type = r_type;
123 fixP->fx_im_disp = 0;
124 fixP->fx_pcrel_adjust = 0;
125 fixP->fx_bit_fixP = 0;
126 fixP->fx_addnumber = 0;
127 fixP->tc_fix_data = NULL;
134 as_where (&fixP->fx_file, &fixP->fx_line);
136 /* Usually, we want relocs sorted numerically, but while
137 comparing to older versions of gas that have relocs
138 reverse sorted, it is convenient to have this compile
139 time option. xoxorich. */
144 fixS **seg_fix_rootP = & (seg_info (now_seg)->fix_root);
145 fixS **seg_fix_tailP = & (seg_info (now_seg)->fix_tail);
148 #ifdef REVERSE_SORT_RELOCS
150 fixP->fx_next = *seg_fix_rootP;
151 *seg_fix_rootP = fixP;
153 #else /* REVERSE_SORT_RELOCS */
155 fixP->fx_next = NULL;
158 (*seg_fix_tailP)->fx_next = fixP;
160 *seg_fix_rootP = fixP;
161 *seg_fix_tailP = fixP;
163 #endif /* REVERSE_SORT_RELOCS */
170 /* Create a fixup relative to a symbol (plus a constant). */
173 fix_new (frag, where, size, add_symbol, offset, pcrel, r_type)
174 fragS *frag; /* Which frag? */
175 int where; /* Where in that frag? */
176 short int size; /* 1, 2, or 4 usually. */
177 symbolS *add_symbol; /* X_add_symbol. */
178 offsetT offset; /* X_add_number. */
179 int pcrel; /* TRUE if PC-relative relocation. */
181 bfd_reloc_code_real_type r_type; /* Relocation type */
183 int r_type; /* Relocation type */
186 return fix_new_internal (frag, where, size, add_symbol,
187 (symbolS *) NULL, offset, pcrel, r_type);
190 /* Create a fixup for an expression. Currently we only support fixups
191 for difference expressions. That is itself more than most object
192 file formats support anyhow. */
195 fix_new_exp (frag, where, size, exp, pcrel, r_type)
196 fragS *frag; /* Which frag? */
197 int where; /* Where in that frag? */
198 short int size; /* 1, 2, or 4 usually. */
199 expressionS *exp; /* Expression. */
200 int pcrel; /* TRUE if PC-relative relocation. */
202 bfd_reloc_code_real_type r_type; /* Relocation type */
204 int r_type; /* Relocation type */
217 sub = exp->X_add_symbol;
218 off = exp->X_add_number;
222 sub = exp->X_op_symbol;
225 add = exp->X_add_symbol;
228 off = exp->X_add_number;
232 as_bad ("expression too complex for fixup");
235 return fix_new_internal (frag, where, size, add, sub, off,
239 /* Append a string onto another string, bumping the pointer along. */
241 append (charPP, fromP, length)
244 unsigned long length;
246 /* Don't trust memcpy() of 0 chars. */
250 memcpy (*charPP, fromP, length);
254 #ifndef BFD_ASSEMBLER
255 int section_alignment[SEG_MAXIMUM_ORDINAL];
259 * This routine records the largest alignment seen for each segment.
260 * If the beginning of the segment is aligned on the worst-case
261 * boundary, all of the other alignments within it will work. At
262 * least one object format really uses this info.
265 record_alignment (seg, align)
266 /* Segment to which alignment pertains */
268 /* Alignment, as a power of 2 (e.g., 1 => 2-byte boundary, 2 => 4-byte
273 if (align > bfd_get_section_alignment (stdoutput, seg))
274 bfd_set_section_alignment (stdoutput, seg, align);
276 if (align > section_alignment[(int) seg])
277 section_alignment[(int) seg] = align;
281 #if defined (BFD_ASSEMBLER) || ! defined (BFD)
284 chain_frchains_together_1 (section, frchp)
286 struct frchain *frchp;
288 fragS dummy, *prev_frag = &dummy;
289 for (; frchp && frchp->frch_seg == section; frchp = frchp->frch_next)
291 prev_frag->fr_next = frchp->frch_root;
292 prev_frag = frchp->frch_last;
294 prev_frag->fr_next = 0;
303 chain_frchains_together (abfd, section, xxx)
304 bfd *abfd; /* unused */
306 PTR xxx; /* unused */
308 segment_info_type *info;
310 /* BFD may have introduced its own sections without using
311 subseg_new, so it is possible that seg_info is NULL. */
312 info = seg_info (section);
313 if (info != (segment_info_type *) NULL)
314 info->frchainP->frch_last
315 = chain_frchains_together_1 (section, info->frchainP);
320 #if !defined (BFD) && !defined (BFD_ASSEMBLER)
323 remove_subsegs (head, seg, root, last)
329 *root = head->frch_root;
330 *last = chain_frchains_together_1 (seg, head);
335 #if defined (BFD_ASSEMBLER) || !defined (BFD)
339 cvt_frag_to_fill (sec, fragP)
344 cvt_frag_to_fill (headers, fragP)
345 object_headers *headers;
349 switch (fragP->fr_type)
354 HANDLE_ALIGN (fragP);
356 fragP->fr_type = rs_fill;
357 know (fragP->fr_var == 1);
358 know (fragP->fr_next != NULL);
360 fragP->fr_offset = (fragP->fr_next->fr_address
368 case rs_machine_dependent:
370 md_convert_frag (stdoutput, sec, fragP);
372 md_convert_frag (headers, fragP);
375 assert (fragP->fr_next == NULL || (fragP->fr_next->fr_address - fragP->fr_address == fragP->fr_fix));
378 * After md_convert_frag, we make the frag into a ".space 0".
379 * Md_convert_frag() should set up any fixSs and constants
385 #ifndef WORKING_DOT_WORD
388 struct broken_word *lie;
390 if (fragP->fr_subtype)
392 fragP->fr_fix += md_short_jump_size;
393 for (lie = (struct broken_word *) (fragP->fr_symbol);
394 lie && lie->dispfrag == fragP;
395 lie = lie->next_broken_word)
397 fragP->fr_fix += md_long_jump_size;
405 BAD_CASE (fragP->fr_type);
410 #endif /* defined (BFD_ASSEMBLER) || !defined (BFD) */
414 relax_and_size_seg (abfd, sec, xxx)
421 segment_info_type *seginfo;
423 valueT size, newsize;
425 flags = bfd_get_section_flags (abfd, sec);
427 seginfo = (segment_info_type *) bfd_get_section_userdata (abfd, sec);
428 if (seginfo && seginfo->frchainP)
430 relax_segment (seginfo->frchainP->frch_root, sec);
431 for (fragp = seginfo->frchainP->frch_root; fragp; fragp = fragp->fr_next)
432 cvt_frag_to_fill (sec, fragp);
433 for (fragp = seginfo->frchainP->frch_root;
435 fragp = fragp->fr_next)
436 /* walk to last elt */;
437 size = fragp->fr_address + fragp->fr_fix;
442 if (size > 0 && ! seginfo->bss)
443 flags |= SEC_HAS_CONTENTS;
445 /* @@ This is just an approximation. */
446 if (seginfo && seginfo->fix_root)
450 x = bfd_set_section_flags (abfd, sec, flags);
453 newsize = md_section_align (sec, size);
454 x = bfd_set_section_size (abfd, sec, newsize);
457 /* If the size had to be rounded up, add some padding in the last
459 assert (newsize >= size);
462 fragS *last = seginfo->frchainP->frch_last;
463 fragp = seginfo->frchainP->frch_root;
464 while (fragp->fr_next != last)
465 fragp = fragp->fr_next;
466 last->fr_address = size;
467 fragp->fr_offset += newsize - size;
470 #ifdef tc_frob_section
471 tc_frob_section (sec);
473 #ifdef obj_frob_section
474 obj_frob_section (sec);
480 dump_section_relocs (abfd, sec, stream_)
485 FILE *stream = (FILE *) stream_;
486 segment_info_type *seginfo = seg_info (sec);
487 fixS *fixp = seginfo->fix_root;
492 fprintf (stream, "sec %s relocs:\n", sec->name);
495 symbolS *s = fixp->fx_addsy;
497 fprintf (stream, " %08x: %s(%s+%x)+%x\n", fixp,
498 S_GET_NAME (s), s->bsym->section->name,
499 S_GET_VALUE (s), fixp->fx_offset);
501 fprintf (stream, " %08x: type %d no sym\n", fixp, fixp->fx_r_type);
502 fixp = fixp->fx_next;
506 #define dump_section_relocs(ABFD,SEC,STREAM) (void)(ABFD,SEC,STREAM)
510 adjust_reloc_syms (abfd, sec, xxx)
515 segment_info_type *seginfo = seg_info (sec);
521 dump_section_relocs (abfd, sec, stderr);
523 for (fixp = seginfo->fix_root; fixp; fixp = fixp->fx_next)
526 symbolS *sym = fixp->fx_addsy;
527 asection *symsec = sym->bsym->section;
528 segment_info_type *symseginfo = seg_info (symsec);
530 /* If it's one of these sections, assume the symbol is
531 definitely going to be output. The code in
532 md_estimate_size_before_relax in tc-mips.c uses this test
533 as well, so if you change this code you should look at that
535 if (symsec == &bfd_und_section
536 || symsec == &bfd_abs_section
537 || bfd_is_com_section (symsec))
539 fixp->fx_addsy->sy_used_in_reloc = 1;
543 /* Since we're reducing to section symbols, don't attempt to reduce
544 anything that's already using one. */
545 if (sym->bsym == symsec->symbol)
547 fixp->fx_addsy->sy_used_in_reloc = 1;
551 /* Is there some other reason we can't adjust this one? (E.g.,
552 call/bal links in i960-bout symbols.) */
553 #ifdef obj_fix_adjustable
554 if (! obj_fix_adjustable (fixp))
556 fixp->fx_addsy->sy_used_in_reloc = 1;
561 /* Is there some other (target cpu dependent) reason we can't adjust
562 this one? (E.g. relocations involving function addresses on
564 #ifdef tc_fix_adjustable
565 if (! tc_fix_adjustable (fixp))
567 fixp->fx_addsy->sy_used_in_reloc = 1;
572 /* If the section symbol isn't going to be output, the relocs
573 at least should still work. If not, figure out what to do
574 when we run into that case. */
575 fixp->fx_offset += S_GET_VALUE (sym);
577 fixp->fx_offset += sym->sy_frag->fr_address;
578 fixp->fx_addsy = section_symbol (symsec);
579 fixp->fx_addsy->sy_used_in_reloc = 1;
582 dump_section_relocs (abfd, sec, stderr);
586 write_relocs (abfd, sec, xxx)
591 segment_info_type *seginfo = seg_info (sec);
597 /* If seginfo is NULL, we did not create this section; don't do
602 fixup_segment (seginfo->fix_root, sec);
605 for (fixp = seginfo->fix_root; fixp; fixp = fixp->fx_next)
608 #ifndef RELOC_EXPANSION_POSSIBLE
609 /* Set up reloc information as well. */
610 relocs = (arelent **) bfd_alloc_by_size_t (stdoutput,
611 n * sizeof (arelent *));
612 memset ((char*)relocs, 0, n * sizeof (arelent*));
615 for (fixp = seginfo->fix_root; fixp != (fixS *) NULL; fixp = fixp->fx_next)
619 bfd_reloc_status_type s;
621 if (fixp->fx_addsy == 0)
623 /* @@ Need some other flag to indicate which have already
628 reloc = tc_gen_reloc (sec, fixp);
634 data = fixp->fx_frag->fr_literal + fixp->fx_where;
635 if (fixp->fx_where + fixp->fx_size
636 > fixp->fx_frag->fr_fix + fixp->fx_frag->fr_offset)
639 if (reloc->howto->partial_inplace == false
640 && reloc->howto->pcrel_offset == true
641 && reloc->howto->pc_relative == true)
643 /* bfd_perform_relocation screws this up */
644 reloc->addend += reloc->address;
646 /* Pass bogus address so that when bfd_perform_relocation adds
647 `reloc->address' back in, it'll come up with `data', which is where
648 we want it to operate. We can't just do it by fudging reloc->address,
649 since that might be used in the calculations(?). */
650 s = bfd_perform_relocation (stdoutput, reloc, data - reloc->address,
657 as_fatal ("bad return from bfd_perform_relocation");
662 n = n * MAX_RELOC_EXPANSION;
663 /* Set up reloc information as well. */
664 relocs = (arelent **) bfd_alloc_by_size_t (stdoutput,
665 n * sizeof (arelent *));
668 for (fixp = seginfo->fix_root; fixp != (fixS *) NULL; fixp = fixp->fx_next)
672 bfd_reloc_status_type s;
675 if (fixp->fx_addsy == 0)
677 /* @@ Need some other flag to indicate which have already
682 reloc = tc_gen_reloc (sec, fixp);
684 for (j = 0; reloc[j]; j++)
686 relocs[i++] = reloc[j];
689 data = fixp->fx_frag->fr_literal + fixp->fx_where;
690 if (fixp->fx_where + fixp->fx_size
691 > fixp->fx_frag->fr_fix + fixp->fx_frag->fr_offset)
693 for (j = 0; reloc[j]; j++)
695 s = bfd_perform_relocation (stdoutput, reloc[j],
696 data - reloc[0]->address,
703 as_fatal ("bad return from bfd_perform_relocation");
711 bfd_set_reloc (stdoutput, sec, relocs, n);
713 bfd_set_section_flags (abfd, sec,
714 (bfd_get_section_flags (abfd, sec)
715 & (flagword) ~SEC_RELOC));
721 fprintf (stderr, "relocs for sec %s\n", sec->name);
722 for (i = 0; i < n; i++)
726 fprintf (stderr, " reloc %2d @%08x off %4x : sym %-10s addend %x\n",
727 i, r, r->address, s->name, r->addend);
734 write_contents (abfd, sec, xxx)
739 segment_info_type *seginfo = seg_info (sec);
740 unsigned long offset = 0;
743 /* Write out the frags. */
745 || ! (bfd_get_section_flags (abfd, sec) & SEC_HAS_CONTENTS))
748 for (f = seginfo->frchainP->frch_root;
753 unsigned long fill_size;
757 assert (f->fr_type == rs_fill);
760 x = bfd_set_section_contents (stdoutput, sec,
761 f->fr_literal, (file_ptr) offset,
762 (bfd_size_type) f->fr_fix);
766 fill_literal = f->fr_literal + f->fr_fix;
767 fill_size = f->fr_var;
768 count = f->fr_offset;
770 if (fill_size && count)
773 x = bfd_set_section_contents (stdoutput, sec,
774 fill_literal, (file_ptr) offset,
775 (bfd_size_type) fill_size);
783 #if defined(BFD_ASSEMBLER) || (!defined (BFD) && !defined(OBJ_AOUT))
785 merge_data_into_text ()
787 #if defined(BFD_ASSEMBLER) || defined(MANY_SEGMENTS)
788 seg_info (text_section)->frchainP->frch_last->fr_next =
789 seg_info (data_section)->frchainP->frch_root;
790 seg_info (text_section)->frchainP->frch_last =
791 seg_info (data_section)->frchainP->frch_last;
792 seg_info (data_section)->frchainP = 0;
796 text_last_frag->fr_next = data_frag_root;
797 text_last_frag = data_last_frag;
798 data_last_frag = NULL;
799 data_frag_root = NULL;
802 for (tmp = text_fix_root; tmp->fx_next; tmp = tmp->fx_next);;
803 tmp->fx_next = data_fix_root;
804 text_fix_tail = data_fix_tail;
807 text_fix_root = data_fix_root;
808 data_fix_root = NULL;
811 #endif /* BFD_ASSEMBLER || (! BFD && ! OBJ_AOUT) */
813 #if !defined (BFD_ASSEMBLER) && !defined (BFD)
815 relax_and_size_all_segments ()
819 relax_segment (text_frag_root, SEG_TEXT);
820 relax_segment (data_frag_root, SEG_DATA);
821 relax_segment (bss_frag_root, SEG_BSS);
823 * Now the addresses of frags are correct within the segment.
826 know (text_last_frag->fr_type == rs_fill && text_last_frag->fr_offset == 0);
827 H_SET_TEXT_SIZE (&headers, text_last_frag->fr_address);
828 text_last_frag->fr_address = H_GET_TEXT_SIZE (&headers);
831 * Join the 2 segments into 1 huge segment.
832 * To do this, re-compute every rn_address in the SEG_DATA frags.
833 * Then join the data frags after the text frags.
835 * Determine a_data [length of data segment].
839 register relax_addressT slide;
841 know ((text_last_frag->fr_type == rs_fill) && (text_last_frag->fr_offset == 0));
843 H_SET_DATA_SIZE (&headers, data_last_frag->fr_address);
844 data_last_frag->fr_address = H_GET_DATA_SIZE (&headers);
845 slide = H_GET_TEXT_SIZE (&headers); /* & in file of the data segment. */
847 #define RoundUp(N,S) (((N)+(S)-1)&-(S))
848 /* For b.out: If the data section has a strict alignment
849 requirement, its load address in the .o file will be
850 rounded up from the size of the text section. These
851 two values are *not* the same! Similarly for the bss
853 slide = RoundUp (slide, 1 << section_alignment[SEG_DATA]);
856 for (fragP = data_frag_root; fragP; fragP = fragP->fr_next)
858 fragP->fr_address += slide;
859 } /* for each data frag */
861 know (text_last_frag != 0);
862 text_last_frag->fr_next = data_frag_root;
866 H_SET_DATA_SIZE (&headers, 0);
870 /* See above comments on b.out data section address. */
873 if (data_last_frag == 0)
874 bss_vma = H_GET_TEXT_SIZE (&headers);
876 bss_vma = data_last_frag->fr_address;
877 bss_vma = RoundUp (bss_vma, 1 << section_alignment[SEG_BSS]);
878 bss_address_frag.fr_address = bss_vma;
880 #else /* ! OBJ_BOUT */
881 bss_address_frag.fr_address = (H_GET_TEXT_SIZE (&headers) +
882 H_GET_DATA_SIZE (&headers));
884 #endif /* ! OBJ_BOUT */
886 /* Slide all the frags */
889 relax_addressT slide = bss_address_frag.fr_address;
891 for (fragP = bss_frag_root; fragP; fragP = fragP->fr_next)
893 fragP->fr_address += slide;
894 } /* for each bss frag */
898 H_SET_BSS_SIZE (&headers,
899 bss_last_frag->fr_address - bss_frag_root->fr_address);
901 H_SET_BSS_SIZE (&headers, 0);
903 #endif /* ! BFD_ASSEMBLER && ! BFD */
905 #if defined (BFD_ASSEMBLER) || !defined (BFD)
910 register struct frchain *frchainP; /* Track along all frchains. */
911 #if ! defined (BFD_ASSEMBLER) || ! defined (WORKING_DOT_WORD)
912 register fragS *fragP; /* Track along all frags. */
914 #if !defined (BFD_ASSEMBLER) && !defined (OBJ_VMS)
915 long object_file_size;
918 /* Do we really want to write it? */
921 n_warns = had_warnings ();
922 n_errs = had_errors ();
923 /* The -Z flag indicates that an object file should be generated,
924 regardless of warnings and errors. */
927 if (n_warns || n_errs)
928 as_warn ("%d error%s, %d warning%s, generating bad object file.\n",
929 n_errs, n_errs == 1 ? "" : "s",
930 n_warns, n_warns == 1 ? "" : "s");
935 as_fatal ("%d error%s, %d warning%s, no object file generated.\n",
936 n_errs, n_errs == 1 ? "" : "s",
937 n_warns, n_warns == 1 ? "" : "s");
943 * Under VMS we try to be compatible with VAX-11 "C". Thus, we
944 * call a routine to check for the definition of the procedure
945 * "_main", and if so -- fix it up so that it can be program
948 VMS_Check_For_Main ();
951 /* After every sub-segment, we fake an ".align ...". This conforms to
952 BSD4.2 brane-damage. We then fake ".fill 0" because that is the kind of
953 frag that requires least thought. ".align" frags like to have a
954 following frag since that makes calculating their intended length
957 @@ Is this really necessary?? */
958 #ifndef SUB_SEGMENT_ALIGN
960 #define SUB_SEGMENT_ALIGN(SEG) (0)
962 #define SUB_SEGMENT_ALIGN(SEG) (2)
965 for (frchainP = frchain_root; frchainP; frchainP = frchainP->frch_next)
967 subseg_set (frchainP->frch_seg, frchainP->frch_subseg);
968 frag_align (SUB_SEGMENT_ALIGN (now_seg), NOP_OPCODE);
969 /* frag_align will have left a new frag.
970 Use this last frag for an empty ".fill".
973 Create a last frag. Do not leave a "being filled in frag". */
974 frag_wane (frag_now);
975 frag_now->fr_fix = 0;
976 know (frag_now->fr_next == NULL);
979 /* From now on, we don't care about sub-segments. Build one frag chain
980 for each segment. Linked thru fr_next. */
983 /* Remove the sections created by gas for its own purposes. */
985 asection **seclist, *sec;
986 seclist = &stdoutput->sections;
987 while (seclist && *seclist)
990 while (sec == reg_section || sec == expr_section)
994 stdoutput->section_count--;
999 seclist = &(*seclist)->next;
1003 bfd_map_over_sections (stdoutput, chain_frchains_together, (char *) 0);
1005 remove_subsegs (frchain_root, SEG_TEXT, &text_frag_root, &text_last_frag);
1006 remove_subsegs (data0_frchainP, SEG_DATA, &data_frag_root, &data_last_frag);
1007 remove_subsegs (bss0_frchainP, SEG_BSS, &bss_frag_root, &bss_last_frag);
1010 /* We have two segments. If user gave -R flag, then we must put the
1011 data frags into the text segment. Do this before relaxing so
1012 we know to take advantage of -R and make shorter addresses. */
1013 #if !defined (OBJ_AOUT) || defined (BFD_ASSEMBLER)
1016 merge_data_into_text ();
1020 #ifdef BFD_ASSEMBLER
1021 bfd_map_over_sections (stdoutput, relax_and_size_seg, (char *) 0);
1023 relax_and_size_all_segments ();
1024 #endif /* BFD_ASSEMBLER */
1026 #ifndef BFD_ASSEMBLER
1029 * Crawl the symbol chain.
1031 * For each symbol whose value depends on a frag, take the address of
1032 * that frag and subsume it into the value of the symbol.
1033 * After this, there is just one way to lookup a symbol value.
1034 * Values are left in their final state for object file emission.
1035 * We adjust the values of 'L' local symbols, even if we do
1036 * not intend to emit them to the object file, because their values
1037 * are needed for fix-ups.
1039 * Unless we saw a -L flag, remove all symbols that begin with 'L'
1040 * from the symbol chain. (They are still pointed to by the fixes.)
1042 * Count the remaining symbols.
1043 * Assign a symbol number to each symbol.
1044 * Count the number of string-table chars we will emit.
1045 * Put this info into the headers as appropriate.
1048 know (zero_address_frag.fr_address == 0);
1049 string_byte_count = sizeof (string_byte_count);
1051 obj_crawl_symbol_chain (&headers);
1053 if (string_byte_count == sizeof (string_byte_count))
1054 string_byte_count = 0;
1056 H_SET_STRING_SIZE (&headers, string_byte_count);
1059 * Addresses of frags now reflect addresses we use in the object file.
1060 * Symbol values are correct.
1061 * Scan the frags, converting any ".org"s and ".align"s to ".fill"s.
1062 * Also converting any machine-dependent frags using md_convert_frag();
1064 subseg_change (SEG_TEXT, 0);
1066 for (fragP = text_frag_root; fragP; fragP = fragP->fr_next)
1068 cvt_frag_to_fill (&headers, fragP);
1070 /* Some assert macros don't work with # directives mixed in. */
1072 if (!(fragP->fr_next == NULL
1074 || fragP->fr_next == data_frag_root
1076 || ((fragP->fr_next->fr_address - fragP->fr_address)
1077 == (fragP->fr_fix + fragP->fr_offset * fragP->fr_var))))
1081 #endif /* ! BFD_ASSEMBLER */
1083 #ifndef WORKING_DOT_WORD
1085 struct broken_word *lie;
1086 struct broken_word **prevP;
1088 prevP = &broken_words;
1089 for (lie = broken_words; lie; lie = lie->next_broken_word)
1094 exp.X_op = O_subtract;
1095 exp.X_add_symbol = lie->add;
1096 exp.X_op_symbol = lie->sub;
1097 exp.X_add_number = lie->addnum;
1098 #ifdef BFD_ASSEMBLER
1099 fix_new_exp (lie->frag,
1100 lie->word_goes_here - lie->frag->fr_literal,
1101 2, &exp, 0, BFD_RELOC_NONE);
1103 #if defined(TC_SPARC) || defined(TC_A29K) || defined(NEED_FX_R_TYPE)
1104 fix_new_exp (lie->frag,
1105 lie->word_goes_here - lie->frag->fr_literal,
1106 2, &exp, 0, NO_RELOC);
1109 fix_new_ns32k_exp (lie->frag,
1110 lie->word_goes_here - lie->frag->fr_literal,
1111 2, &exp, 0, 0, 2, 0, 0);
1113 fix_new_exp (lie->frag,
1114 lie->word_goes_here - lie->frag->fr_literal,
1116 #endif /* TC_NS32K */
1117 #endif /* TC_SPARC|TC_A29K|NEED_FX_R_TYPE */
1118 #endif /* BFD_ASSEMBLER */
1119 *prevP = lie->next_broken_word;
1122 prevP = &(lie->next_broken_word);
1124 for (lie = broken_words; lie;)
1126 struct broken_word *untruth;
1128 addressT table_addr;
1129 addressT from_addr, to_addr;
1132 fragP = lie->dispfrag;
1134 /* Find out how many broken_words go here. */
1136 for (untruth = lie; untruth && untruth->dispfrag == fragP; untruth = untruth->next_broken_word)
1137 if (untruth->added == 1)
1140 table_ptr = lie->dispfrag->fr_opcode;
1141 table_addr = lie->dispfrag->fr_address + (table_ptr - lie->dispfrag->fr_literal);
1142 /* Create the jump around the long jumps. This is a short
1143 jump from table_ptr+0 to table_ptr+n*long_jump_size. */
1144 from_addr = table_addr;
1145 to_addr = table_addr + md_short_jump_size + n * md_long_jump_size;
1146 md_create_short_jump (table_ptr, from_addr, to_addr, lie->dispfrag, lie->add);
1147 table_ptr += md_short_jump_size;
1148 table_addr += md_short_jump_size;
1150 for (m = 0; lie && lie->dispfrag == fragP; m++, lie = lie->next_broken_word)
1152 if (lie->added == 2)
1154 /* Patch the jump table */
1155 /* This is the offset from ??? to table_ptr+0 */
1156 to_addr = table_addr - S_GET_VALUE (lie->sub);
1157 md_number_to_chars (lie->word_goes_here, to_addr, 2);
1158 for (untruth = lie->next_broken_word; untruth && untruth->dispfrag == fragP; untruth = untruth->next_broken_word)
1160 if (untruth->use_jump == lie)
1161 md_number_to_chars (untruth->word_goes_here, to_addr, 2);
1164 /* Install the long jump */
1165 /* this is a long jump from table_ptr+0 to the final target */
1166 from_addr = table_addr;
1167 to_addr = S_GET_VALUE (lie->add) + lie->addnum;
1168 md_create_long_jump (table_ptr, from_addr, to_addr, lie->dispfrag, lie->add);
1169 table_ptr += md_long_jump_size;
1170 table_addr += md_long_jump_size;
1174 #endif /* not WORKING_DOT_WORD */
1176 #ifndef BFD_ASSEMBLER
1180 * Scan every FixS performing fixups. We had to wait until now to do
1181 * this because md_convert_frag() may have made some fixSs.
1185 subseg_change (SEG_TEXT, 0);
1186 trsize = md_reloc_size * fixup_segment (text_fix_root, SEG_TEXT);
1187 subseg_change (SEG_DATA, 0);
1188 drsize = md_reloc_size * fixup_segment (data_fix_root, SEG_DATA);
1189 H_SET_RELOCATION_SIZE (&headers, trsize, drsize);
1191 /* FIXME move this stuff into the pre-write-hook */
1192 H_SET_MAGIC_NUMBER (&headers, magic_number_for_object_file);
1193 H_SET_ENTRY_POINT (&headers, 0);
1195 obj_pre_write_hook (&headers); /* extra coff stuff */
1197 object_file_size = H_GET_FILE_SIZE (&headers);
1198 next_object_file_charP = the_object_file = xmalloc (object_file_size);
1200 output_file_create (out_file_name);
1202 obj_header_append (&next_object_file_charP, &headers);
1204 know ((next_object_file_charP - the_object_file) == H_GET_HEADER_SIZE (&headers));
1209 for (fragP = text_frag_root; fragP; fragP = fragP->fr_next)
1211 register long count;
1212 register char *fill_literal;
1213 register long fill_size;
1215 know (fragP->fr_type == rs_fill);
1216 append (&next_object_file_charP, fragP->fr_literal, (unsigned long) fragP->fr_fix);
1217 fill_literal = fragP->fr_literal + fragP->fr_fix;
1218 fill_size = fragP->fr_var;
1219 know (fragP->fr_offset >= 0);
1221 for (count = fragP->fr_offset; count; count--)
1223 append (&next_object_file_charP, fill_literal, (unsigned long) fill_size);
1226 } /* for each code frag. */
1228 know ((next_object_file_charP - the_object_file) == (H_GET_HEADER_SIZE (&headers) + H_GET_TEXT_SIZE (&headers) + H_GET_DATA_SIZE (&headers)));
1233 obj_emit_relocations (&next_object_file_charP, text_fix_root, (relax_addressT) 0);
1234 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)));
1236 /* Make addresses in data relocation directives relative to beginning of
1237 * first data fragment, not end of last text fragment: alignment of the
1238 * start of the data segment may place a gap between the segments.
1240 obj_emit_relocations (&next_object_file_charP, data_fix_root, data0_frchainP->frch_root->fr_address);
1242 obj_emit_relocations (&next_object_file_charP, data_fix_root, text_last_frag->fr_address);
1243 #endif /* TC_I960 */
1245 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)));
1248 * Emit line number entries.
1250 OBJ_EMIT_LINENO (&next_object_file_charP, lineno_rootP, the_object_file);
1251 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)));
1256 obj_emit_symbols (&next_object_file_charP, symbol_rootP);
1257 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)));
1263 if (string_byte_count > 0)
1265 obj_emit_strings (&next_object_file_charP);
1266 } /* only if we have a string table */
1269 bfd_seek (stdoutput, 0, 0);
1270 bfd_write (the_object_file, 1, object_file_size, stdoutput);
1273 /* Write the data to the file */
1274 output_file_append (the_object_file, object_file_size, out_file_name);
1276 } /* non vms output */
1279 * Now do the VMS-dependent part of writing the object file
1281 VMS_write_object_file (H_GET_TEXT_SIZE (&headers),
1282 H_GET_DATA_SIZE (&headers),
1283 H_GET_BSS_SIZE (&headers),
1284 text_frag_root, data_frag_root);
1286 #else /* BFD_ASSEMBLER */
1288 bfd_map_over_sections (stdoutput, adjust_reloc_syms, (char *)0);
1290 /* Set up symbol table, and write it out. */
1297 for (symp = symbol_rootP; symp; symp = symbol_next (symp))
1299 if (! symp->sy_resolved)
1301 if (symp->sy_value.X_op == O_constant)
1303 /* This is the normal case; skip the call. */
1306 + symp->sy_frag->fr_address));
1307 symp->sy_resolved = 1;
1310 resolve_symbol_value (symp);
1313 /* So far, common symbols have been treated like undefined symbols.
1314 Put them in the common section now. */
1315 if (S_IS_DEFINED (symp) == 0
1316 && S_GET_VALUE (symp) != 0)
1317 S_SET_SEGMENT (symp, &bfd_com_section);
1319 printf ("symbol `%s'\n\t@%x: value=%d flags=%x seg=%s\n",
1320 S_GET_NAME (symp), symp,
1323 segment_name (symp->bsym->section));
1326 #ifdef obj_frob_symbol
1329 obj_frob_symbol (symp, punt);
1334 #ifdef tc_frob_symbol
1337 tc_frob_symbol (symp, punt);
1343 /* If we don't want to keep this symbol, splice it out of the
1345 if (S_IS_LOCAL (symp))
1348 if (! symp->sy_used_in_reloc)
1350 symbolS *prev, *next;
1351 prev = symbol_previous (symp);
1352 next = symbol_next (symp);
1354 verify_symbol_chain_2 (symp);
1358 symbol_next (prev) = next;
1361 else if (symp == symbol_rootP)
1362 symbol_rootP = next;
1366 symbol_previous (next) = prev;
1368 symbol_lastP = prev;
1371 verify_symbol_chain_2 (prev);
1373 verify_symbol_chain_2 (next);
1379 /* Make sure we really got a value for the symbol. */
1380 if (! symp->sy_resolved)
1382 as_bad ("can't resolve value for symbol \"%s\"",
1384 symp->sy_resolved = 1;
1387 /* Set the value into the BFD symbol. Up til now the value
1388 has only been kept in the gas symbolS struct. */
1389 symp->bsym->value = S_GET_VALUE (symp);
1398 extern PTR bfd_alloc PARAMS ((bfd *, size_t));
1400 asympp = (asymbol **) bfd_alloc (stdoutput,
1401 n * sizeof (asymbol *));
1402 symp = symbol_rootP;
1403 for (i = 0; i < n; i++, symp = symbol_next (symp))
1405 asympp[i] = symp->bsym;
1408 result = bfd_set_symtab (stdoutput, asympp, n);
1409 assert (result == true);
1414 #ifdef obj_frob_file
1415 /* If obj_frob_file changes the symbol value at this point, it is
1416 responsible for moving the changed value into symp->bsym->value
1417 as well. Hopefully all symbol value changing can be done in
1418 {obj,tc}_frob_symbol. */
1422 /* Now that all the sizes are known, and contents correct, we can
1423 start writing the file. */
1424 bfd_map_over_sections (stdoutput, write_relocs, (char *) 0);
1426 bfd_map_over_sections (stdoutput, write_contents, (char *) 0);
1427 #endif /* BFD_ASSEMBLER */
1434 * Now we have a segment, not a crowd of sub-segments, we can make fr_address
1439 * After this, all frags in this segment have addresses that are correct
1440 * within the segment. Since segments live in different file addresses,
1441 * these frag addresses may not be the same as final object-file addresses.
1444 #ifndef md_relax_frag
1446 /* Subroutines of relax_segment. */
1452 for (; f1; f1 = f1->fr_next)
1453 if (f1->fr_next == f2)
1458 #endif /* ! defined (md_relax_frag) */
1460 /* Relax_align. Advance location counter to next address that has 'alignment'
1461 lowest order bits all 0s, return size of adjustment made. */
1462 static relax_addressT
1463 relax_align (address, alignment)
1464 register relax_addressT address; /* Address now. */
1465 register int alignment; /* Alignment (binary). */
1467 relax_addressT mask;
1468 relax_addressT new_address;
1470 mask = ~((~0) << alignment);
1471 new_address = (address + mask) & (~mask);
1473 /* We must provide lots of padding, so the linker can discard it
1474 when needed. The linker will not add extra space, ever. */
1475 new_address += (1 << alignment);
1476 return (new_address - address);
1480 relax_segment (segment_frag_root, segment)
1481 struct frag *segment_frag_root;
1484 register struct frag *fragP;
1485 register relax_addressT address;
1486 #if !defined (MANY_SEGMENTS) && !defined (BFD_ASSEMBLER)
1487 know (segment == SEG_DATA || segment == SEG_TEXT || segment == SEG_BSS);
1489 /* In case md_estimate_size_before_relax() wants to make fixSs. */
1490 subseg_change (segment, 0);
1492 /* For each frag in segment: count and store (a 1st guess of)
1495 for (fragP = segment_frag_root; fragP; fragP = fragP->fr_next)
1497 fragP->fr_address = address;
1498 address += fragP->fr_fix;
1500 switch (fragP->fr_type)
1503 address += fragP->fr_offset * fragP->fr_var;
1507 address += relax_align (address, (int) fragP->fr_offset);
1511 /* Assume .org is nugatory. It will grow with 1st relax. */
1514 case rs_machine_dependent:
1515 address += md_estimate_size_before_relax (fragP, segment);
1518 #ifndef WORKING_DOT_WORD
1519 /* Broken words don't concern us yet */
1520 case rs_broken_word:
1525 BAD_CASE (fragP->fr_type);
1527 } /* switch(fr_type) */
1528 } /* for each frag in the segment */
1532 long stretch; /* May be any size, 0 or negative. */
1533 /* Cumulative number of addresses we have */
1534 /* relaxed this pass. */
1535 /* We may have relaxed more than one address. */
1536 long stretched; /* Have we stretched on this pass? */
1537 /* This is 'cuz stretch may be zero, when, in fact some piece of code
1538 grew, and another shrank. If a branch instruction doesn't fit anymore,
1539 we could be scrod. */
1543 stretch = stretched = 0;
1544 for (fragP = segment_frag_root; fragP; fragP = fragP->fr_next)
1547 unsigned long was_address;
1553 was_address = fragP->fr_address;
1554 address = fragP->fr_address += stretch;
1555 symbolP = fragP->fr_symbol;
1556 offset = fragP->fr_offset;
1558 switch (fragP->fr_type)
1560 case rs_fill: /* .fill never relaxes. */
1564 #ifndef WORKING_DOT_WORD
1565 /* JF: This is RMS's idea. I do *NOT* want to be blamed
1566 for it I do not want to write it. I do not want to have
1567 anything to do with it. This is not the proper way to
1568 implement this misfeature. */
1569 case rs_broken_word:
1571 struct broken_word *lie;
1572 struct broken_word *untruth;
1574 /* Yes this is ugly (storing the broken_word pointer
1575 in the symbol slot). Still, this whole chunk of
1576 code is ugly, and I don't feel like doing anything
1577 about it. Think of it as stubbornness in action. */
1579 for (lie = (struct broken_word *) (fragP->fr_symbol);
1580 lie && lie->dispfrag == fragP;
1581 lie = lie->next_broken_word)
1587 offset = (lie->add->sy_frag->fr_address
1588 + S_GET_VALUE (lie->add)
1590 - (lie->sub->sy_frag->fr_address
1591 + S_GET_VALUE (lie->sub)));
1592 if (offset <= -32768 || offset >= 32767)
1597 sprint_value (buf, (addressT) lie->addnum);
1598 as_warn (".word %s-%s+%s didn't fit",
1599 S_GET_NAME (lie->add),
1600 S_GET_NAME (lie->sub),
1604 if (fragP->fr_subtype == 0)
1606 fragP->fr_subtype++;
1607 growth += md_short_jump_size;
1609 for (untruth = lie->next_broken_word;
1610 untruth && untruth->dispfrag == lie->dispfrag;
1611 untruth = untruth->next_broken_word)
1612 if ((untruth->add->sy_frag == lie->add->sy_frag)
1613 && S_GET_VALUE (untruth->add) == S_GET_VALUE (lie->add))
1616 untruth->use_jump = lie;
1618 growth += md_long_jump_size;
1623 } /* case rs_broken_word */
1626 growth = (relax_align ((relax_addressT) (address
1629 - relax_align ((relax_addressT) (was_address
1639 #if !defined (MANY_SEGMENTS) && !defined (BFD_ASSEMBLER)
1640 know ((S_GET_SEGMENT (symbolP) == SEG_ABSOLUTE)
1641 || (S_GET_SEGMENT (symbolP) == SEG_DATA)
1642 || (S_GET_SEGMENT (symbolP) == SEG_TEXT)
1643 || S_GET_SEGMENT (symbolP) == SEG_BSS);
1644 know (symbolP->sy_frag);
1645 know (!(S_GET_SEGMENT (symbolP) == SEG_ABSOLUTE)
1646 || (symbolP->sy_frag == &zero_address_frag));
1648 target += S_GET_VALUE (symbolP)
1649 + symbolP->sy_frag->fr_address;
1650 } /* if we have a symbol */
1652 know (fragP->fr_next);
1653 after = fragP->fr_next->fr_address;
1654 growth = ((target - after) > 0) ? (target - after) : 0;
1655 /* Growth may be negative, but variable part of frag
1656 cannot have fewer than 0 chars. That is, we can't
1659 growth -= stretch; /* This is an absolute growth factor */
1662 case rs_machine_dependent:
1663 #ifdef md_relax_frag
1664 growth = md_relax_frag (fragP, stretch);
1666 /* The default way to relax a frag is to look through
1669 const relax_typeS *this_type;
1670 const relax_typeS *start_type;
1671 relax_substateT next_state;
1672 relax_substateT this_state;
1675 this_state = fragP->fr_subtype;
1676 start_type = this_type = md_relax_table + this_state;
1681 #ifndef DIFF_EXPR_OK
1682 #if !defined (MANY_SEGMENTS) && !defined (BFD_ASSEMBLER)
1683 know ((S_GET_SEGMENT (symbolP) == SEG_ABSOLUTE)
1684 || (S_GET_SEGMENT (symbolP) == SEG_DATA)
1685 || (S_GET_SEGMENT (symbolP) == SEG_BSS)
1686 || (S_GET_SEGMENT (symbolP) == SEG_TEXT));
1688 know (symbolP->sy_frag);
1690 know (!(S_GET_SEGMENT (symbolP) == absolute_section)
1691 || symbolP->sy_frag == &zero_address_frag);
1693 S_GET_VALUE (symbolP)
1694 + symbolP->sy_frag->fr_address;
1696 /* If frag has yet to be reached on this pass,
1697 assume it will move by STRETCH just as we did.
1698 If this is not so, it will be because some frag
1699 between grows, and that will force another pass.
1701 Beware zero-length frags.
1703 There should be a faster way to do this. */
1705 if (symbolP->sy_frag->fr_address >= was_address
1706 && is_dnrange (fragP, symbolP->sy_frag))
1712 aim = target - address - fragP->fr_fix;
1713 /* The displacement is affected by the instruction size
1714 for the 32k architecture. I think we ought to be able
1715 to add fragP->fr_pcrel_adjust in all cases (it should be
1716 zero if not used), but just in case it breaks something
1717 else we'll put this inside #ifdef NS32K ... #endif */
1719 if (fragP->fr_pcrel_adjust)
1722 aim += fragP->fr_pcrel_adjust;
1726 /* Look backwards. */
1727 for (next_state = this_type->rlx_more; next_state;)
1728 if (aim >= this_type->rlx_backward)
1732 /* Grow to next state. */
1733 this_state = next_state;
1734 this_type = md_relax_table + this_state;
1735 next_state = this_type->rlx_more;
1740 #ifdef M68K_AIM_KLUDGE
1741 M68K_AIM_KLUDGE (aim, this_state, this_type);
1743 /* Look forwards. */
1744 for (next_state = this_type->rlx_more; next_state;)
1745 if (aim <= this_type->rlx_forward)
1749 /* Grow to next state. */
1750 this_state = next_state;
1751 this_type = md_relax_table + this_state;
1752 next_state = this_type->rlx_more;
1756 growth = this_type->rlx_length - start_type->rlx_length;
1758 fragP->fr_subtype = this_state;
1764 BAD_CASE (fragP->fr_type);
1772 } /* For each frag in the segment. */
1774 while (stretched); /* Until nothing further to relax. */
1778 * We now have valid fr_address'es for each frag.
1782 * All fr_address's are correct, relative to their own segment.
1783 * We have made all the fixS we will ever make.
1785 } /* relax_segment() */
1787 #if defined (BFD_ASSEMBLER) || !defined (BFD)
1791 Go through all the fixS's in a segment and see which ones can be
1792 handled now. (These consist of fixS where we have since discovered
1793 the value of a symbol, or the address of the frag involved.)
1794 For each one, call md_apply_fix to put the fix into the frag data.
1796 Result is a count of how many relocation structs will be needed to
1797 handle the remaining fixS's that we couldn't completely handle here.
1798 These will be output later by emit_relocations(). */
1801 fixup_segment (fixP, this_segment_type)
1802 register fixS *fixP;
1803 segT this_segment_type; /* N_TYPE bits for segment. */
1805 long seg_reloc_count = 0;
1806 symbolS *add_symbolP;
1807 symbolS *sub_symbolP;
1814 segT add_symbol_segment = absolute_section;
1816 /* If the linker is doing the relaxing, we must not do any fixups.
1818 Well, strictly speaking that's not true -- we could do any that are
1819 PC-relative and don't cross regions that could change size. And for the
1820 i960 (the only machine for which we've got a relaxing linker right now),
1821 we might be able to turn callx/callj into bal anyways in cases where we
1822 know the maximum displacement. */
1825 for (; fixP; fixP = fixP->fx_next)
1827 TC_ADJUST_RELOC_COUNT (fixP, seg_reloc_count);
1828 return seg_reloc_count;
1831 for (; fixP; fixP = fixP->fx_next)
1833 fragP = fixP->fx_frag;
1835 where = fixP->fx_where;
1836 place = fragP->fr_literal + where;
1837 size = fixP->fx_size;
1838 add_symbolP = fixP->fx_addsy;
1839 #ifdef TC_VALIDATE_FIX
1840 TC_VALIDATE_FIX (fixP, this_segment_type, skip);
1842 sub_symbolP = fixP->fx_subsy;
1843 add_number = fixP->fx_offset;
1844 pcrel = fixP->fx_pcrel;
1847 add_symbol_segment = S_GET_SEGMENT (add_symbolP);
1854 if (S_GET_SEGMENT (sub_symbolP) == absolute_section)
1855 add_number -= S_GET_VALUE (sub_symbolP);
1857 && S_GET_SEGMENT (sub_symbolP) == this_segment_type)
1859 /* Should try converting to a constant. */
1864 as_bad ("Negative of non-absolute symbol %s",
1865 S_GET_NAME (sub_symbolP));
1867 else if ((S_GET_SEGMENT (sub_symbolP) == add_symbol_segment)
1868 && (SEG_NORMAL (add_symbol_segment)
1869 || (add_symbol_segment == absolute_section)))
1871 /* Difference of 2 symbols from same segment.
1872 Can't make difference of 2 undefineds: 'value' means
1873 something different for N_UNDF. */
1875 /* Makes no sense to use the difference of 2 arbitrary symbols
1876 as the target of a call instruction. */
1878 as_bad ("callj to difference of 2 symbols");
1879 #endif /* TC_I960 */
1880 add_number += S_GET_VALUE (add_symbolP) -
1881 S_GET_VALUE (sub_symbolP);
1885 /* Let the target machine make the final determination
1886 as to whether or not a relocation will be needed to
1887 handle this fixup. */
1888 if (!TC_FORCE_RELOCATION (fixP))
1889 fixP->fx_addsy = NULL;
1893 /* Different segments in subtraction. */
1894 know (!(S_IS_EXTERNAL (sub_symbolP)
1895 && (S_GET_SEGMENT (sub_symbolP) == absolute_section)));
1897 if ((S_GET_SEGMENT (sub_symbolP) == absolute_section))
1898 add_number -= S_GET_VALUE (sub_symbolP);
1901 else if (S_GET_SEGMENT (sub_symbolP) == this_segment_type
1902 #if 0 /* Do this even if it's already described as pc-relative. For example,
1903 on the m68k, an operand of "pc@(foo-.-2)" should address "foo" in a
1904 pc-relative mode. */
1909 /* Make it pc-relative. */
1910 add_number += (md_pcrel_from (fixP)
1911 - S_GET_VALUE (sub_symbolP));
1921 sprint_value (buf, fragP->fr_address + where);
1922 as_bad ("Can't emit reloc {- %s-seg symbol \"%s\"} @ file address %s.",
1923 segment_name (S_GET_SEGMENT (sub_symbolP)),
1924 S_GET_NAME (sub_symbolP), buf);
1931 if (add_symbol_segment == this_segment_type && pcrel)
1934 * This fixup was made when the symbol's segment was
1935 * SEG_UNKNOWN, but it is now in the local segment.
1936 * So we know how to do the address without relocation.
1939 /* reloc_callj() may replace a 'call' with a 'calls' or a
1940 'bal', in which cases it modifies *fixP as appropriate.
1941 In the case of a 'calls', no further work is required,
1942 and *fixP has been set up to make the rest of the code
1945 #endif /* TC_I960 */
1947 add_number += S_GET_VALUE (add_symbolP);
1948 add_number -= md_pcrel_from (fixP);
1949 pcrel = 0; /* Lie. Don't want further pcrel processing. */
1951 /* Let the target machine make the final determination
1952 as to whether or not a relocation will be needed to
1953 handle this fixup. */
1954 if (!TC_FORCE_RELOCATION (fixP))
1955 fixP->fx_addsy = NULL;
1959 if (add_symbol_segment == absolute_section)
1962 /* See comment about reloc_callj() above. */
1964 #endif /* TC_I960 */
1965 add_number += S_GET_VALUE (add_symbolP);
1967 /* Let the target machine make the final determination
1968 as to whether or not a relocation will be needed to
1969 handle this fixup. */
1970 if (!TC_FORCE_RELOCATION (fixP))
1971 fixP->fx_addsy = NULL;
1974 else if (add_symbol_segment == undefined_section
1975 #ifdef BFD_ASSEMBLER
1976 || bfd_is_com_section (add_symbol_segment)
1981 if ((int) fixP->fx_bit_fixP == 13)
1983 /* This is a COBR instruction. They have only a
1984 * 13-bit displacement and are only to be used
1985 * for local branches: flag as error, don't generate
1988 as_bad ("can't use COBR format with external label");
1990 /* Let the target machine make the final determination
1991 as to whether or not a relocation will be needed to
1992 handle this fixup. */
1993 if (!TC_FORCE_RELOCATION (fixP))
1994 fixP->fx_addsy = NULL;
1997 #endif /* TC_I960 */
2001 if (S_IS_COMMON (add_symbolP))
2002 add_number += S_GET_VALUE (add_symbolP);
2003 #endif /* TE_I386AIX */
2004 #endif /* OBJ_COFF */
2010 add_number += S_GET_VALUE (add_symbolP);
2017 add_number -= md_pcrel_from (fixP);
2018 if (add_symbolP == 0)
2020 fixP->fx_addsy = &abs_symbol;
2022 } /* if there's an add_symbol */
2025 if (!fixP->fx_bit_fixP && size > 0)
2028 /* set all bits to one */
2030 /* Technically speaking, combining these produces an
2031 undefined result if size is sizeof (valueT), though I
2032 think these two half-way operations should both be
2036 if ((add_number & mask) != 0
2037 && (add_number & mask) != mask)
2039 char buf[50], buf2[50];
2040 sprint_value (buf, fragP->fr_address + where);
2041 if (add_number > 1000)
2042 sprint_value (buf2, add_number);
2044 sprintf (buf2, "%ld", (long) add_number);
2045 as_bad_where (fixP->fx_file, fixP->fx_line,
2046 "Value of %s too large for field of %d bytes at %s",
2048 } /* generic error checking */
2049 #ifdef WARN_SIGNED_OVERFLOW_WORD
2050 /* Warn if a .word value is too large when treated as a signed
2051 number. We already know it is not too negative. This is to
2052 catch over-large switches generated by gcc on the 68k. */
2055 && add_number > 0x7fff)
2056 as_bad_where (fixP->fx_file, fixP->fx_line,
2057 "Signed .word overflow; switch may be too large; %ld at 0x%lx",
2059 (unsigned long) (fragP->fr_address + where));
2061 } /* not a bit fix */
2063 #ifdef BFD_ASSEMBLER
2064 md_apply_fix (fixP, &add_number);
2066 md_apply_fix (fixP, add_number);
2070 } /* For each fixS in this segment. */
2072 TC_ADJUST_RELOC_COUNT (fixP, seg_reloc_count);
2073 return seg_reloc_count;
2076 #endif /* defined (BFD_ASSEMBLER) || !defined (BFD) */
2079 number_to_chars_bigendian (buf, val, n)
2084 if (n > sizeof (val)|| n <= 0)
2088 buf[n] = val & 0xff;
2094 number_to_chars_littleendian (buf, val, n)
2099 if (n > sizeof (val) || n <= 0)
2103 *buf++ = val & 0xff;
2108 /* end of write.c */