1 /* write.c - emit .o file
2 Copyright (C) 1986, 87, 90, 91, 92, 93, 1994 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;
135 as_where (&fixP->fx_file, &fixP->fx_line);
137 /* Usually, we want relocs sorted numerically, but while
138 comparing to older versions of gas that have relocs
139 reverse sorted, it is convenient to have this compile
140 time option. xoxorich. */
145 fixS **seg_fix_rootP = &frchain_now->fix_root;
146 fixS **seg_fix_tailP = &frchain_now->fix_tail;
149 #ifdef REVERSE_SORT_RELOCS
151 fixP->fx_next = *seg_fix_rootP;
152 *seg_fix_rootP = fixP;
154 #else /* REVERSE_SORT_RELOCS */
156 fixP->fx_next = NULL;
159 (*seg_fix_tailP)->fx_next = fixP;
161 *seg_fix_rootP = fixP;
162 *seg_fix_tailP = fixP;
164 #endif /* REVERSE_SORT_RELOCS */
171 /* Create a fixup relative to a symbol (plus a constant). */
174 fix_new (frag, where, size, add_symbol, offset, pcrel, r_type)
175 fragS *frag; /* Which frag? */
176 int where; /* Where in that frag? */
177 short int size; /* 1, 2, or 4 usually. */
178 symbolS *add_symbol; /* X_add_symbol. */
179 offsetT offset; /* X_add_number. */
180 int pcrel; /* TRUE if PC-relative relocation. */
182 bfd_reloc_code_real_type r_type; /* Relocation type */
184 int r_type; /* Relocation type */
187 return fix_new_internal (frag, where, size, add_symbol,
188 (symbolS *) NULL, offset, pcrel, r_type);
191 /* Create a fixup for an expression. Currently we only support fixups
192 for difference expressions. That is itself more than most object
193 file formats support anyhow. */
196 fix_new_exp (frag, where, size, exp, pcrel, r_type)
197 fragS *frag; /* Which frag? */
198 int where; /* Where in that frag? */
199 short int size; /* 1, 2, or 4 usually. */
200 expressionS *exp; /* Expression. */
201 int pcrel; /* TRUE if PC-relative relocation. */
203 bfd_reloc_code_real_type r_type; /* Relocation type */
205 int r_type; /* Relocation type */
218 sub = exp->X_add_symbol;
219 off = exp->X_add_number;
223 sub = exp->X_op_symbol;
226 add = exp->X_add_symbol;
229 off = exp->X_add_number;
233 as_bad ("expression too complex for fixup");
236 return fix_new_internal (frag, where, size, add, sub, off,
240 /* Append a string onto another string, bumping the pointer along. */
242 append (charPP, fromP, length)
245 unsigned long length;
247 /* Don't trust memcpy() of 0 chars. */
251 memcpy (*charPP, fromP, length);
255 #ifndef BFD_ASSEMBLER
256 int section_alignment[SEG_MAXIMUM_ORDINAL];
260 * This routine records the largest alignment seen for each segment.
261 * If the beginning of the segment is aligned on the worst-case
262 * boundary, all of the other alignments within it will work. At
263 * least one object format really uses this info.
266 record_alignment (seg, align)
267 /* Segment to which alignment pertains */
269 /* Alignment, as a power of 2 (e.g., 1 => 2-byte boundary, 2 => 4-byte
274 if (align > bfd_get_section_alignment (stdoutput, seg))
275 bfd_set_section_alignment (stdoutput, seg, align);
277 if (align > section_alignment[(int) seg])
278 section_alignment[(int) seg] = align;
282 #if defined (BFD_ASSEMBLER) || ! defined (BFD)
285 chain_frchains_together_1 (section, frchp)
287 struct frchain *frchp;
289 fragS dummy, *prev_frag = &dummy;
290 fixS fix_dummy, *prev_fix = &fix_dummy;
292 for (; frchp && frchp->frch_seg == section; frchp = frchp->frch_next)
294 prev_frag->fr_next = frchp->frch_root;
295 prev_frag = frchp->frch_last;
297 if (frchp->fix_root != (fixS *) NULL)
299 if (seg_info (section)->fix_root == (fixS *) NULL)
300 seg_info (section)->fix_root = frchp->fix_root;
301 prev_fix->fx_next = frchp->fix_root;
302 prev_fix = frchp->fix_tail;
306 prev_frag->fr_next = 0;
315 chain_frchains_together (abfd, section, xxx)
316 bfd *abfd; /* unused */
318 PTR xxx; /* unused */
320 segment_info_type *info;
322 /* BFD may have introduced its own sections without using
323 subseg_new, so it is possible that seg_info is NULL. */
324 info = seg_info (section);
325 if (info != (segment_info_type *) NULL)
326 info->frchainP->frch_last
327 = chain_frchains_together_1 (section, info->frchainP);
332 #if !defined (BFD) && !defined (BFD_ASSEMBLER)
335 remove_subsegs (head, seg, root, last)
341 *root = head->frch_root;
342 *last = chain_frchains_together_1 (seg, head);
347 #if defined (BFD_ASSEMBLER) || !defined (BFD)
351 cvt_frag_to_fill (sec, fragP)
356 cvt_frag_to_fill (headers, fragP)
357 object_headers *headers;
361 switch (fragP->fr_type)
366 HANDLE_ALIGN (fragP);
368 fragP->fr_type = rs_fill;
369 know (fragP->fr_next != NULL);
370 fragP->fr_offset = (fragP->fr_next->fr_address
372 - fragP->fr_fix) / fragP->fr_var;
378 case rs_machine_dependent:
380 md_convert_frag (stdoutput, sec, fragP);
382 md_convert_frag (headers, fragP);
385 assert (fragP->fr_next == NULL || (fragP->fr_next->fr_address - fragP->fr_address == fragP->fr_fix));
388 * After md_convert_frag, we make the frag into a ".space 0".
389 * Md_convert_frag() should set up any fixSs and constants
395 #ifndef WORKING_DOT_WORD
398 struct broken_word *lie;
400 if (fragP->fr_subtype)
402 fragP->fr_fix += md_short_jump_size;
403 for (lie = (struct broken_word *) (fragP->fr_symbol);
404 lie && lie->dispfrag == fragP;
405 lie = lie->next_broken_word)
407 fragP->fr_fix += md_long_jump_size;
415 BAD_CASE (fragP->fr_type);
420 #endif /* defined (BFD_ASSEMBLER) || !defined (BFD) */
424 relax_and_size_seg (abfd, sec, xxx)
431 segment_info_type *seginfo;
433 valueT size, newsize;
435 flags = bfd_get_section_flags (abfd, sec);
437 seginfo = (segment_info_type *) bfd_get_section_userdata (abfd, sec);
438 if (seginfo && seginfo->frchainP)
440 relax_segment (seginfo->frchainP->frch_root, sec);
441 for (fragp = seginfo->frchainP->frch_root; fragp; fragp = fragp->fr_next)
442 cvt_frag_to_fill (sec, fragp);
443 for (fragp = seginfo->frchainP->frch_root;
445 fragp = fragp->fr_next)
446 /* walk to last elt */;
447 size = fragp->fr_address + fragp->fr_fix;
452 if (size > 0 && ! seginfo->bss)
453 flags |= SEC_HAS_CONTENTS;
455 /* @@ This is just an approximation. */
456 if (seginfo && seginfo->fix_root)
460 x = bfd_set_section_flags (abfd, sec, flags);
463 newsize = md_section_align (sec, size);
464 x = bfd_set_section_size (abfd, sec, newsize);
467 /* If the size had to be rounded up, add some padding in the last
469 assert (newsize >= size);
472 fragS *last = seginfo->frchainP->frch_last;
473 fragp = seginfo->frchainP->frch_root;
474 while (fragp->fr_next != last)
475 fragp = fragp->fr_next;
476 last->fr_address = size;
477 fragp->fr_offset += newsize - size;
480 #ifdef tc_frob_section
481 tc_frob_section (sec);
483 #ifdef obj_frob_section
484 obj_frob_section (sec);
490 dump_section_relocs (abfd, sec, stream_)
495 FILE *stream = (FILE *) stream_;
496 segment_info_type *seginfo = seg_info (sec);
497 fixS *fixp = seginfo->fix_root;
502 fprintf (stream, "sec %s relocs:\n", sec->name);
505 symbolS *s = fixp->fx_addsy;
507 fprintf (stream, " %08x: %s(%s+%x)+%x\n", fixp,
508 S_GET_NAME (s), s->bsym->section->name,
509 S_GET_VALUE (s), fixp->fx_offset);
511 fprintf (stream, " %08x: type %d no sym\n", fixp, fixp->fx_r_type);
512 fixp = fixp->fx_next;
516 #define dump_section_relocs(ABFD,SEC,STREAM) (void)(ABFD,SEC,STREAM)
519 #ifndef EMIT_SECTION_SYMBOLS
520 #define EMIT_SECTION_SYMBOLS 1
524 adjust_reloc_syms (abfd, sec, xxx)
529 segment_info_type *seginfo = seg_info (sec);
535 dump_section_relocs (abfd, sec, stderr);
537 for (fixp = seginfo->fix_root; fixp; fixp = fixp->fx_next)
540 else if (fixp->fx_addsy)
542 symbolS *sym = fixp->fx_addsy;
543 asection *symsec = sym->bsym->section;
545 /* If it's one of these sections, assume the symbol is
546 definitely going to be output. The code in
547 md_estimate_size_before_relax in tc-mips.c uses this test
548 as well, so if you change this code you should look at that
550 if (symsec == &bfd_und_section
551 || symsec == &bfd_abs_section
552 || bfd_is_com_section (symsec))
554 fixp->fx_addsy->sy_used_in_reloc = 1;
558 /* Since we're reducing to section symbols, don't attempt to reduce
559 anything that's already using one. */
560 if (sym->bsym->flags & BSF_SECTION_SYM)
562 fixp->fx_addsy->sy_used_in_reloc = 1;
566 /* Is there some other reason we can't adjust this one? (E.g.,
567 call/bal links in i960-bout symbols.) */
568 #ifdef obj_fix_adjustable
569 if (! obj_fix_adjustable (fixp))
571 fixp->fx_addsy->sy_used_in_reloc = 1;
576 /* Is there some other (target cpu dependent) reason we can't adjust
577 this one? (E.g. relocations involving function addresses on
579 #ifdef tc_fix_adjustable
580 if (! tc_fix_adjustable (fixp))
582 fixp->fx_addsy->sy_used_in_reloc = 1;
587 /* If the section symbol isn't going to be output, the relocs
588 at least should still work. If not, figure out what to do
589 when we run into that case. */
590 fixp->fx_offset += S_GET_VALUE (sym);
592 fixp->fx_offset += sym->sy_frag->fr_address;
593 fixp->fx_addsy = section_symbol (symsec);
594 fixp->fx_addsy->sy_used_in_reloc = 1;
596 #ifdef RELOC_REQUIRES_SYMBOL
599 /* There was no symbol required by this relocation. However,
600 BFD doesn't really handle relocations without symbols well.
601 (At least, the COFF support doesn't.) So for now we fake up
602 a local symbol in the absolute section. */
604 abs_symbol.sy_used_in_reloc = 1;
605 fixp->fx_addsy = &abs_symbol;
609 dump_section_relocs (abfd, sec, stderr);
613 write_relocs (abfd, sec, xxx)
618 segment_info_type *seginfo = seg_info (sec);
625 /* If seginfo is NULL, we did not create this section; don't do
630 fixup_segment (seginfo->fix_root, sec);
633 for (fixp = seginfo->fix_root; fixp; fixp = fixp->fx_next)
636 #ifndef RELOC_EXPANSION_POSSIBLE
637 /* Set up reloc information as well. */
638 relocs = (arelent **) bfd_alloc_by_size_t (stdoutput,
639 n * sizeof (arelent *));
640 memset ((char*)relocs, 0, n * sizeof (arelent*));
643 for (fixp = seginfo->fix_root; fixp != (fixS *) NULL; fixp = fixp->fx_next)
647 bfd_reloc_status_type s;
654 reloc = tc_gen_reloc (sec, fixp);
660 data = fixp->fx_frag->fr_literal + fixp->fx_where;
661 if (fixp->fx_where + fixp->fx_size
662 > fixp->fx_frag->fr_fix + fixp->fx_frag->fr_offset)
665 if (reloc->howto->partial_inplace == false
666 && reloc->howto->pcrel_offset == true
667 && reloc->howto->pc_relative == true)
669 /* bfd_perform_relocation screws this up */
670 reloc->addend += reloc->address;
672 /* Pass bogus address so that when bfd_perform_relocation adds
673 `reloc->address' back in, it'll come up with `data', which is where
674 we want it to operate. We can't just do it by fudging reloc->address,
675 since that might be used in the calculations(?). */
676 s = bfd_perform_relocation (stdoutput, reloc, data - reloc->address,
677 sec, stdoutput, &err);
682 case bfd_reloc_overflow:
683 as_bad_where (fixp->fx_file, fixp->fx_line, "relocation overflow");
686 as_fatal ("bad return from bfd_perform_relocation");
691 n = n * MAX_RELOC_EXPANSION;
692 /* Set up reloc information as well. */
693 relocs = (arelent **) bfd_alloc_by_size_t (stdoutput,
694 n * sizeof (arelent *));
697 for (fixp = seginfo->fix_root; fixp != (fixS *) NULL; fixp = fixp->fx_next)
701 bfd_reloc_status_type s;
709 reloc = tc_gen_reloc (sec, fixp);
711 for (j = 0; reloc[j]; j++)
713 relocs[i++] = reloc[j];
716 data = fixp->fx_frag->fr_literal + fixp->fx_where;
717 if (fixp->fx_where + fixp->fx_size
718 > fixp->fx_frag->fr_fix + fixp->fx_frag->fr_offset)
720 for (j = 0; reloc[j]; j++)
722 s = bfd_perform_relocation (stdoutput, reloc[j],
723 data - reloc[0]->address,
724 sec, stdoutput, &err);
730 as_fatal ("bad return from bfd_perform_relocation");
738 bfd_set_reloc (stdoutput, sec, relocs, n);
740 bfd_set_section_flags (abfd, sec,
741 (bfd_get_section_flags (abfd, sec)
742 & (flagword) ~SEC_RELOC));
749 fprintf (stderr, "relocs for sec %s\n", sec->name);
750 for (i = 0; i < n; i++)
754 fprintf (stderr, " reloc %2d @%08x off %4x : sym %-10s addend %x\n",
755 i, r, r->address, s->name, r->addend);
762 write_contents (abfd, sec, xxx)
767 segment_info_type *seginfo = seg_info (sec);
768 unsigned long offset = 0;
771 /* Write out the frags. */
773 || ! (bfd_get_section_flags (abfd, sec) & SEC_HAS_CONTENTS))
776 for (f = seginfo->frchainP->frch_root;
781 unsigned long fill_size;
785 assert (f->fr_type == rs_fill);
788 x = bfd_set_section_contents (stdoutput, sec,
789 f->fr_literal, (file_ptr) offset,
790 (bfd_size_type) f->fr_fix);
794 fill_literal = f->fr_literal + f->fr_fix;
795 fill_size = f->fr_var;
796 count = f->fr_offset;
798 if (fill_size && count)
801 x = bfd_set_section_contents (stdoutput, sec,
802 fill_literal, (file_ptr) offset,
803 (bfd_size_type) fill_size);
811 #if defined(BFD_ASSEMBLER) || (!defined (BFD) && !defined(OBJ_AOUT))
813 merge_data_into_text ()
815 #if defined(BFD_ASSEMBLER) || defined(MANY_SEGMENTS)
816 seg_info (text_section)->frchainP->frch_last->fr_next =
817 seg_info (data_section)->frchainP->frch_root;
818 seg_info (text_section)->frchainP->frch_last =
819 seg_info (data_section)->frchainP->frch_last;
820 seg_info (data_section)->frchainP = 0;
824 text_last_frag->fr_next = data_frag_root;
825 text_last_frag = data_last_frag;
826 data_last_frag = NULL;
827 data_frag_root = NULL;
830 for (tmp = text_fix_root; tmp->fx_next; tmp = tmp->fx_next);;
831 tmp->fx_next = data_fix_root;
832 text_fix_tail = data_fix_tail;
835 text_fix_root = data_fix_root;
836 data_fix_root = NULL;
839 #endif /* BFD_ASSEMBLER || (! BFD && ! OBJ_AOUT) */
841 #if !defined (BFD_ASSEMBLER) && !defined (BFD)
843 relax_and_size_all_segments ()
847 relax_segment (text_frag_root, SEG_TEXT);
848 relax_segment (data_frag_root, SEG_DATA);
849 relax_segment (bss_frag_root, SEG_BSS);
851 * Now the addresses of frags are correct within the segment.
854 know (text_last_frag->fr_type == rs_fill && text_last_frag->fr_offset == 0);
855 H_SET_TEXT_SIZE (&headers, text_last_frag->fr_address);
856 text_last_frag->fr_address = H_GET_TEXT_SIZE (&headers);
859 * Join the 2 segments into 1 huge segment.
860 * To do this, re-compute every rn_address in the SEG_DATA frags.
861 * Then join the data frags after the text frags.
863 * Determine a_data [length of data segment].
867 register relax_addressT slide;
869 know ((text_last_frag->fr_type == rs_fill) && (text_last_frag->fr_offset == 0));
871 H_SET_DATA_SIZE (&headers, data_last_frag->fr_address);
872 data_last_frag->fr_address = H_GET_DATA_SIZE (&headers);
873 slide = H_GET_TEXT_SIZE (&headers); /* & in file of the data segment. */
875 #define RoundUp(N,S) (((N)+(S)-1)&-(S))
876 /* For b.out: If the data section has a strict alignment
877 requirement, its load address in the .o file will be
878 rounded up from the size of the text section. These
879 two values are *not* the same! Similarly for the bss
881 slide = RoundUp (slide, 1 << section_alignment[SEG_DATA]);
884 for (fragP = data_frag_root; fragP; fragP = fragP->fr_next)
886 fragP->fr_address += slide;
887 } /* for each data frag */
889 know (text_last_frag != 0);
890 text_last_frag->fr_next = data_frag_root;
894 H_SET_DATA_SIZE (&headers, 0);
898 /* See above comments on b.out data section address. */
901 if (data_last_frag == 0)
902 bss_vma = H_GET_TEXT_SIZE (&headers);
904 bss_vma = data_last_frag->fr_address;
905 bss_vma = RoundUp (bss_vma, 1 << section_alignment[SEG_BSS]);
906 bss_address_frag.fr_address = bss_vma;
908 #else /* ! OBJ_BOUT */
909 bss_address_frag.fr_address = (H_GET_TEXT_SIZE (&headers) +
910 H_GET_DATA_SIZE (&headers));
912 #endif /* ! OBJ_BOUT */
914 /* Slide all the frags */
917 relax_addressT slide = bss_address_frag.fr_address;
919 for (fragP = bss_frag_root; fragP; fragP = fragP->fr_next)
921 fragP->fr_address += slide;
922 } /* for each bss frag */
926 H_SET_BSS_SIZE (&headers,
927 bss_last_frag->fr_address - bss_frag_root->fr_address);
929 H_SET_BSS_SIZE (&headers, 0);
931 #endif /* ! BFD_ASSEMBLER && ! BFD */
933 #if defined (BFD_ASSEMBLER) || !defined (BFD)
938 register struct frchain *frchainP; /* Track along all frchains. */
939 #if ! defined (BFD_ASSEMBLER) || ! defined (WORKING_DOT_WORD)
940 register fragS *fragP; /* Track along all frags. */
942 #if !defined (BFD_ASSEMBLER) && !defined (OBJ_VMS)
943 long object_file_size;
946 /* Do we really want to write it? */
949 n_warns = had_warnings ();
950 n_errs = had_errors ();
951 /* The -Z flag indicates that an object file should be generated,
952 regardless of warnings and errors. */
955 if (n_warns || n_errs)
956 as_warn ("%d error%s, %d warning%s, generating bad object file.\n",
957 n_errs, n_errs == 1 ? "" : "s",
958 n_warns, n_warns == 1 ? "" : "s");
963 as_fatal ("%d error%s, %d warning%s, no object file generated.\n",
964 n_errs, n_errs == 1 ? "" : "s",
965 n_warns, n_warns == 1 ? "" : "s");
971 * Under VMS we try to be compatible with VAX-11 "C". Thus, we
972 * call a routine to check for the definition of the procedure
973 * "_main", and if so -- fix it up so that it can be program
976 VMS_Check_For_Main ();
979 /* After every sub-segment, we fake an ".align ...". This conforms to
980 BSD4.2 brane-damage. We then fake ".fill 0" because that is the kind of
981 frag that requires least thought. ".align" frags like to have a
982 following frag since that makes calculating their intended length
985 @@ Is this really necessary?? */
986 #ifndef SUB_SEGMENT_ALIGN
988 #define SUB_SEGMENT_ALIGN(SEG) (0)
990 #define SUB_SEGMENT_ALIGN(SEG) (2)
993 for (frchainP = frchain_root; frchainP; frchainP = frchainP->frch_next)
995 subseg_set (frchainP->frch_seg, frchainP->frch_subseg);
996 frag_align (SUB_SEGMENT_ALIGN (now_seg), NOP_OPCODE);
997 /* frag_align will have left a new frag.
998 Use this last frag for an empty ".fill".
1000 For this segment ...
1001 Create a last frag. Do not leave a "being filled in frag". */
1002 frag_wane (frag_now);
1003 frag_now->fr_fix = 0;
1004 know (frag_now->fr_next == NULL);
1007 /* From now on, we don't care about sub-segments. Build one frag chain
1008 for each segment. Linked thru fr_next. */
1010 #ifdef BFD_ASSEMBLER
1011 /* Remove the sections created by gas for its own purposes. */
1013 asection **seclist, *sec;
1014 seclist = &stdoutput->sections;
1015 while (seclist && *seclist)
1018 while (sec == reg_section || sec == expr_section)
1022 stdoutput->section_count--;
1027 seclist = &(*seclist)->next;
1031 bfd_map_over_sections (stdoutput, chain_frchains_together, (char *) 0);
1033 remove_subsegs (frchain_root, SEG_TEXT, &text_frag_root, &text_last_frag);
1034 remove_subsegs (data0_frchainP, SEG_DATA, &data_frag_root, &data_last_frag);
1035 remove_subsegs (bss0_frchainP, SEG_BSS, &bss_frag_root, &bss_last_frag);
1038 /* We have two segments. If user gave -R flag, then we must put the
1039 data frags into the text segment. Do this before relaxing so
1040 we know to take advantage of -R and make shorter addresses. */
1041 #if !defined (OBJ_AOUT) || defined (BFD_ASSEMBLER)
1044 merge_data_into_text ();
1048 #ifdef BFD_ASSEMBLER
1049 bfd_map_over_sections (stdoutput, relax_and_size_seg, (char *) 0);
1051 relax_and_size_all_segments ();
1052 #endif /* BFD_ASSEMBLER */
1054 #ifndef BFD_ASSEMBLER
1057 * Crawl the symbol chain.
1059 * For each symbol whose value depends on a frag, take the address of
1060 * that frag and subsume it into the value of the symbol.
1061 * After this, there is just one way to lookup a symbol value.
1062 * Values are left in their final state for object file emission.
1063 * We adjust the values of 'L' local symbols, even if we do
1064 * not intend to emit them to the object file, because their values
1065 * are needed for fix-ups.
1067 * Unless we saw a -L flag, remove all symbols that begin with 'L'
1068 * from the symbol chain. (They are still pointed to by the fixes.)
1070 * Count the remaining symbols.
1071 * Assign a symbol number to each symbol.
1072 * Count the number of string-table chars we will emit.
1073 * Put this info into the headers as appropriate.
1076 know (zero_address_frag.fr_address == 0);
1077 string_byte_count = sizeof (string_byte_count);
1079 obj_crawl_symbol_chain (&headers);
1081 if (string_byte_count == sizeof (string_byte_count))
1082 string_byte_count = 0;
1084 H_SET_STRING_SIZE (&headers, string_byte_count);
1087 * Addresses of frags now reflect addresses we use in the object file.
1088 * Symbol values are correct.
1089 * Scan the frags, converting any ".org"s and ".align"s to ".fill"s.
1090 * Also converting any machine-dependent frags using md_convert_frag();
1092 subseg_change (SEG_TEXT, 0);
1094 for (fragP = text_frag_root; fragP; fragP = fragP->fr_next)
1096 cvt_frag_to_fill (&headers, fragP);
1098 /* Some assert macros don't work with # directives mixed in. */
1100 if (!(fragP->fr_next == NULL
1102 || fragP->fr_next == data_frag_root
1104 || ((fragP->fr_next->fr_address - fragP->fr_address)
1105 == (fragP->fr_fix + fragP->fr_offset * fragP->fr_var))))
1109 #endif /* ! BFD_ASSEMBLER */
1111 #ifndef WORKING_DOT_WORD
1113 struct broken_word *lie;
1114 struct broken_word **prevP;
1116 prevP = &broken_words;
1117 for (lie = broken_words; lie; lie = lie->next_broken_word)
1122 exp.X_op = O_subtract;
1123 exp.X_add_symbol = lie->add;
1124 exp.X_op_symbol = lie->sub;
1125 exp.X_add_number = lie->addnum;
1126 #ifdef BFD_ASSEMBLER
1127 fix_new_exp (lie->frag,
1128 lie->word_goes_here - lie->frag->fr_literal,
1129 2, &exp, 0, BFD_RELOC_NONE);
1131 #if defined(TC_SPARC) || defined(TC_A29K) || defined(NEED_FX_R_TYPE)
1132 fix_new_exp (lie->frag,
1133 lie->word_goes_here - lie->frag->fr_literal,
1134 2, &exp, 0, NO_RELOC);
1137 fix_new_ns32k_exp (lie->frag,
1138 lie->word_goes_here - lie->frag->fr_literal,
1139 2, &exp, 0, 0, 2, 0, 0);
1141 fix_new_exp (lie->frag,
1142 lie->word_goes_here - lie->frag->fr_literal,
1144 #endif /* TC_NS32K */
1145 #endif /* TC_SPARC|TC_A29K|NEED_FX_R_TYPE */
1146 #endif /* BFD_ASSEMBLER */
1147 *prevP = lie->next_broken_word;
1150 prevP = &(lie->next_broken_word);
1152 for (lie = broken_words; lie;)
1154 struct broken_word *untruth;
1156 addressT table_addr;
1157 addressT from_addr, to_addr;
1160 fragP = lie->dispfrag;
1162 /* Find out how many broken_words go here. */
1164 for (untruth = lie; untruth && untruth->dispfrag == fragP; untruth = untruth->next_broken_word)
1165 if (untruth->added == 1)
1168 table_ptr = lie->dispfrag->fr_opcode;
1169 table_addr = lie->dispfrag->fr_address + (table_ptr - lie->dispfrag->fr_literal);
1170 /* Create the jump around the long jumps. This is a short
1171 jump from table_ptr+0 to table_ptr+n*long_jump_size. */
1172 from_addr = table_addr;
1173 to_addr = table_addr + md_short_jump_size + n * md_long_jump_size;
1174 md_create_short_jump (table_ptr, from_addr, to_addr, lie->dispfrag, lie->add);
1175 table_ptr += md_short_jump_size;
1176 table_addr += md_short_jump_size;
1178 for (m = 0; lie && lie->dispfrag == fragP; m++, lie = lie->next_broken_word)
1180 if (lie->added == 2)
1182 /* Patch the jump table */
1183 /* This is the offset from ??? to table_ptr+0 */
1184 to_addr = table_addr - S_GET_VALUE (lie->sub);
1185 md_number_to_chars (lie->word_goes_here, to_addr, 2);
1186 for (untruth = lie->next_broken_word; untruth && untruth->dispfrag == fragP; untruth = untruth->next_broken_word)
1188 if (untruth->use_jump == lie)
1189 md_number_to_chars (untruth->word_goes_here, to_addr, 2);
1192 /* Install the long jump */
1193 /* this is a long jump from table_ptr+0 to the final target */
1194 from_addr = table_addr;
1195 to_addr = S_GET_VALUE (lie->add) + lie->addnum;
1196 md_create_long_jump (table_ptr, from_addr, to_addr, lie->dispfrag, lie->add);
1197 table_ptr += md_long_jump_size;
1198 table_addr += md_long_jump_size;
1202 #endif /* not WORKING_DOT_WORD */
1204 #ifndef BFD_ASSEMBLER
1208 * Scan every FixS performing fixups. We had to wait until now to do
1209 * this because md_convert_frag() may have made some fixSs.
1213 subseg_change (SEG_TEXT, 0);
1214 trsize = md_reloc_size * fixup_segment (text_fix_root, SEG_TEXT);
1215 subseg_change (SEG_DATA, 0);
1216 drsize = md_reloc_size * fixup_segment (data_fix_root, SEG_DATA);
1217 H_SET_RELOCATION_SIZE (&headers, trsize, drsize);
1219 /* FIXME move this stuff into the pre-write-hook */
1220 H_SET_MAGIC_NUMBER (&headers, magic_number_for_object_file);
1221 H_SET_ENTRY_POINT (&headers, 0);
1223 obj_pre_write_hook (&headers); /* extra coff stuff */
1225 object_file_size = H_GET_FILE_SIZE (&headers);
1226 next_object_file_charP = the_object_file = xmalloc (object_file_size);
1228 output_file_create (out_file_name);
1230 obj_header_append (&next_object_file_charP, &headers);
1232 know ((next_object_file_charP - the_object_file) == H_GET_HEADER_SIZE (&headers));
1237 for (fragP = text_frag_root; fragP; fragP = fragP->fr_next)
1239 register long count;
1240 register char *fill_literal;
1241 register long fill_size;
1243 know (fragP->fr_type == rs_fill);
1244 append (&next_object_file_charP, fragP->fr_literal, (unsigned long) fragP->fr_fix);
1245 fill_literal = fragP->fr_literal + fragP->fr_fix;
1246 fill_size = fragP->fr_var;
1247 know (fragP->fr_offset >= 0);
1249 for (count = fragP->fr_offset; count; count--)
1251 append (&next_object_file_charP, fill_literal, (unsigned long) fill_size);
1254 } /* for each code frag. */
1256 know ((next_object_file_charP - the_object_file) == (H_GET_HEADER_SIZE (&headers) + H_GET_TEXT_SIZE (&headers) + H_GET_DATA_SIZE (&headers)));
1261 obj_emit_relocations (&next_object_file_charP, text_fix_root, (relax_addressT) 0);
1262 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)));
1264 /* Make addresses in data relocation directives relative to beginning of
1265 * first data fragment, not end of last text fragment: alignment of the
1266 * start of the data segment may place a gap between the segments.
1268 obj_emit_relocations (&next_object_file_charP, data_fix_root, data0_frchainP->frch_root->fr_address);
1270 obj_emit_relocations (&next_object_file_charP, data_fix_root, text_last_frag->fr_address);
1271 #endif /* TC_I960 */
1273 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)));
1276 * Emit line number entries.
1278 OBJ_EMIT_LINENO (&next_object_file_charP, lineno_rootP, the_object_file);
1279 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)));
1284 obj_emit_symbols (&next_object_file_charP, symbol_rootP);
1285 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)));
1291 if (string_byte_count > 0)
1293 obj_emit_strings (&next_object_file_charP);
1294 } /* only if we have a string table */
1297 bfd_seek (stdoutput, 0, 0);
1298 bfd_write (the_object_file, 1, object_file_size, stdoutput);
1301 /* Write the data to the file */
1302 output_file_append (the_object_file, object_file_size, out_file_name);
1304 } /* non vms output */
1307 * Now do the VMS-dependent part of writing the object file
1309 VMS_write_object_file (H_GET_TEXT_SIZE (&headers),
1310 H_GET_DATA_SIZE (&headers),
1311 H_GET_BSS_SIZE (&headers),
1312 text_frag_root, data_frag_root);
1314 #else /* BFD_ASSEMBLER */
1316 bfd_map_over_sections (stdoutput, adjust_reloc_syms, (char *)0);
1318 /* Set up symbol table, and write it out. */
1325 for (symp = symbol_rootP; symp; symp = symbol_next (symp))
1329 if (! symp->sy_resolved)
1331 if (symp->sy_value.X_op == O_constant)
1333 /* This is the normal case; skip the call. */
1336 + symp->sy_frag->fr_address));
1337 symp->sy_resolved = 1;
1340 resolve_symbol_value (symp);
1343 /* So far, common symbols have been treated like undefined symbols.
1344 Put them in the common section now. */
1345 if (S_IS_DEFINED (symp) == 0
1346 && S_GET_VALUE (symp) != 0)
1347 S_SET_SEGMENT (symp, &bfd_com_section);
1349 printf ("symbol `%s'\n\t@%x: value=%d flags=%x seg=%s\n",
1350 S_GET_NAME (symp), symp,
1353 segment_name (symp->bsym->section));
1356 #ifdef obj_frob_symbol
1357 obj_frob_symbol (symp, punt);
1359 #ifdef tc_frob_symbol
1360 if (! punt || symp->sy_used_in_reloc)
1361 tc_frob_symbol (symp, punt);
1364 /* If we don't want to keep this symbol, splice it out of
1365 the chain now. If EMIT_SECTION_SYMBOLS is 0, we never
1366 want section symbols. Otherwise, we skip local symbols
1367 and symbols that the frob_symbol macros told us to punt,
1368 but we keep such symbols if they are used in relocs. */
1369 if ((! EMIT_SECTION_SYMBOLS
1370 && (symp->bsym->flags & BSF_SECTION_SYM) != 0)
1371 || ((S_IS_LOCAL (symp) || punt)
1372 && ! symp->sy_used_in_reloc))
1374 symbolS *prev, *next;
1376 prev = symbol_previous (symp);
1377 next = symbol_next (symp);
1379 verify_symbol_chain_2 (symp);
1383 symbol_next (prev) = next;
1386 else if (symp == symbol_rootP)
1387 symbol_rootP = next;
1391 symbol_previous (next) = prev;
1393 symbol_lastP = prev;
1396 verify_symbol_chain_2 (prev);
1398 verify_symbol_chain_2 (next);
1403 /* Make sure we really got a value for the symbol. */
1404 if (! symp->sy_resolved)
1406 as_bad ("can't resolve value for symbol \"%s\"",
1408 symp->sy_resolved = 1;
1411 /* Set the value into the BFD symbol. Up til now the value
1412 has only been kept in the gas symbolS struct. */
1413 symp->bsym->value = S_GET_VALUE (symp);
1422 extern PTR bfd_alloc PARAMS ((bfd *, size_t));
1424 asympp = (asymbol **) bfd_alloc (stdoutput,
1425 n * sizeof (asymbol *));
1426 symp = symbol_rootP;
1427 for (i = 0; i < n; i++, symp = symbol_next (symp))
1429 asympp[i] = symp->bsym;
1432 result = bfd_set_symtab (stdoutput, asympp, n);
1433 assert (result == true);
1441 #ifdef obj_frob_file
1442 /* If obj_frob_file changes the symbol value at this point, it is
1443 responsible for moving the changed value into symp->bsym->value
1444 as well. Hopefully all symbol value changing can be done in
1445 {obj,tc}_frob_symbol. */
1449 /* Now that all the sizes are known, and contents correct, we can
1450 start writing the file. */
1451 bfd_map_over_sections (stdoutput, write_relocs, (char *) 0);
1453 bfd_map_over_sections (stdoutput, write_contents, (char *) 0);
1454 #endif /* BFD_ASSEMBLER */
1461 * Now we have a segment, not a crowd of sub-segments, we can make fr_address
1466 * After this, all frags in this segment have addresses that are correct
1467 * within the segment. Since segments live in different file addresses,
1468 * these frag addresses may not be the same as final object-file addresses.
1471 #ifndef md_relax_frag
1473 /* Subroutines of relax_segment. */
1479 for (; f1; f1 = f1->fr_next)
1480 if (f1->fr_next == f2)
1485 #endif /* ! defined (md_relax_frag) */
1487 /* Relax_align. Advance location counter to next address that has 'alignment'
1488 lowest order bits all 0s, return size of adjustment made. */
1489 static relax_addressT
1490 relax_align (address, alignment)
1491 register relax_addressT address; /* Address now. */
1492 register int alignment; /* Alignment (binary). */
1494 relax_addressT mask;
1495 relax_addressT new_address;
1497 mask = ~((~0) << alignment);
1498 new_address = (address + mask) & (~mask);
1500 /* We must provide lots of padding, so the linker can discard it
1501 when needed. The linker will not add extra space, ever. */
1502 new_address += (1 << alignment);
1503 return (new_address - address);
1507 relax_segment (segment_frag_root, segment)
1508 struct frag *segment_frag_root;
1511 register struct frag *fragP;
1512 register relax_addressT address;
1513 #if !defined (MANY_SEGMENTS) && !defined (BFD_ASSEMBLER)
1514 know (segment == SEG_DATA || segment == SEG_TEXT || segment == SEG_BSS);
1516 /* In case md_estimate_size_before_relax() wants to make fixSs. */
1517 subseg_change (segment, 0);
1519 /* For each frag in segment: count and store (a 1st guess of)
1522 for (fragP = segment_frag_root; fragP; fragP = fragP->fr_next)
1524 fragP->fr_address = address;
1525 address += fragP->fr_fix;
1527 switch (fragP->fr_type)
1530 address += fragP->fr_offset * fragP->fr_var;
1535 int offset = relax_align (address, (int) fragP->fr_offset);
1536 if (offset % fragP->fr_var != 0)
1538 as_bad ("alignment padding (%d bytes) not a multiple of %ld",
1539 offset, (long) fragP->fr_var);
1540 offset -= (offset % fragP->fr_var);
1547 /* Assume .org is nugatory. It will grow with 1st relax. */
1550 case rs_machine_dependent:
1551 address += md_estimate_size_before_relax (fragP, segment);
1554 #ifndef WORKING_DOT_WORD
1555 /* Broken words don't concern us yet */
1556 case rs_broken_word:
1561 BAD_CASE (fragP->fr_type);
1563 } /* switch(fr_type) */
1564 } /* for each frag in the segment */
1568 long stretch; /* May be any size, 0 or negative. */
1569 /* Cumulative number of addresses we have */
1570 /* relaxed this pass. */
1571 /* We may have relaxed more than one address. */
1572 long stretched; /* Have we stretched on this pass? */
1573 /* This is 'cuz stretch may be zero, when, in fact some piece of code
1574 grew, and another shrank. If a branch instruction doesn't fit anymore,
1575 we could be scrod. */
1579 stretch = stretched = 0;
1580 for (fragP = segment_frag_root; fragP; fragP = fragP->fr_next)
1583 unsigned long was_address;
1589 was_address = fragP->fr_address;
1590 address = fragP->fr_address += stretch;
1591 symbolP = fragP->fr_symbol;
1592 offset = fragP->fr_offset;
1594 switch (fragP->fr_type)
1596 case rs_fill: /* .fill never relaxes. */
1600 #ifndef WORKING_DOT_WORD
1601 /* JF: This is RMS's idea. I do *NOT* want to be blamed
1602 for it I do not want to write it. I do not want to have
1603 anything to do with it. This is not the proper way to
1604 implement this misfeature. */
1605 case rs_broken_word:
1607 struct broken_word *lie;
1608 struct broken_word *untruth;
1610 /* Yes this is ugly (storing the broken_word pointer
1611 in the symbol slot). Still, this whole chunk of
1612 code is ugly, and I don't feel like doing anything
1613 about it. Think of it as stubbornness in action. */
1615 for (lie = (struct broken_word *) (fragP->fr_symbol);
1616 lie && lie->dispfrag == fragP;
1617 lie = lie->next_broken_word)
1623 offset = (lie->add->sy_frag->fr_address
1624 + S_GET_VALUE (lie->add)
1626 - (lie->sub->sy_frag->fr_address
1627 + S_GET_VALUE (lie->sub)));
1628 if (offset <= -32768 || offset >= 32767)
1633 sprint_value (buf, (addressT) lie->addnum);
1634 as_warn (".word %s-%s+%s didn't fit",
1635 S_GET_NAME (lie->add),
1636 S_GET_NAME (lie->sub),
1640 if (fragP->fr_subtype == 0)
1642 fragP->fr_subtype++;
1643 growth += md_short_jump_size;
1645 for (untruth = lie->next_broken_word;
1646 untruth && untruth->dispfrag == lie->dispfrag;
1647 untruth = untruth->next_broken_word)
1648 if ((untruth->add->sy_frag == lie->add->sy_frag)
1649 && S_GET_VALUE (untruth->add) == S_GET_VALUE (lie->add))
1652 untruth->use_jump = lie;
1654 growth += md_long_jump_size;
1659 } /* case rs_broken_word */
1662 growth = (relax_align ((relax_addressT) (address
1665 - relax_align ((relax_addressT) (was_address
1675 #if !defined (MANY_SEGMENTS) && !defined (BFD_ASSEMBLER)
1676 know ((S_GET_SEGMENT (symbolP) == SEG_ABSOLUTE)
1677 || (S_GET_SEGMENT (symbolP) == SEG_DATA)
1678 || (S_GET_SEGMENT (symbolP) == SEG_TEXT)
1679 || S_GET_SEGMENT (symbolP) == SEG_BSS);
1680 know (symbolP->sy_frag);
1681 know (!(S_GET_SEGMENT (symbolP) == SEG_ABSOLUTE)
1682 || (symbolP->sy_frag == &zero_address_frag));
1684 target += S_GET_VALUE (symbolP)
1685 + symbolP->sy_frag->fr_address;
1686 } /* if we have a symbol */
1688 know (fragP->fr_next);
1689 after = fragP->fr_next->fr_address;
1690 growth = ((target - after) > 0) ? (target - after) : 0;
1691 /* Growth may be negative, but variable part of frag
1692 cannot have fewer than 0 chars. That is, we can't
1695 growth -= stretch; /* This is an absolute growth factor */
1698 case rs_machine_dependent:
1699 #ifdef md_relax_frag
1700 growth = md_relax_frag (fragP, stretch);
1702 /* The default way to relax a frag is to look through
1705 const relax_typeS *this_type;
1706 const relax_typeS *start_type;
1707 relax_substateT next_state;
1708 relax_substateT this_state;
1711 this_state = fragP->fr_subtype;
1712 start_type = this_type = md_relax_table + this_state;
1717 #ifndef DIFF_EXPR_OK
1718 #if !defined (MANY_SEGMENTS) && !defined (BFD_ASSEMBLER)
1719 know ((S_GET_SEGMENT (symbolP) == SEG_ABSOLUTE)
1720 || (S_GET_SEGMENT (symbolP) == SEG_DATA)
1721 || (S_GET_SEGMENT (symbolP) == SEG_BSS)
1722 || (S_GET_SEGMENT (symbolP) == SEG_TEXT));
1724 know (symbolP->sy_frag);
1726 know (!(S_GET_SEGMENT (symbolP) == absolute_section)
1727 || symbolP->sy_frag == &zero_address_frag);
1729 S_GET_VALUE (symbolP)
1730 + symbolP->sy_frag->fr_address;
1732 /* If frag has yet to be reached on this pass,
1733 assume it will move by STRETCH just as we did.
1734 If this is not so, it will be because some frag
1735 between grows, and that will force another pass.
1737 Beware zero-length frags.
1739 There should be a faster way to do this. */
1741 if (symbolP->sy_frag->fr_address >= was_address
1742 && is_dnrange (fragP, symbolP->sy_frag))
1748 aim = target - address - fragP->fr_fix;
1749 /* The displacement is affected by the instruction size
1750 for the 32k architecture. I think we ought to be able
1751 to add fragP->fr_pcrel_adjust in all cases (it should be
1752 zero if not used), but just in case it breaks something
1753 else we'll put this inside #ifdef NS32K ... #endif */
1755 if (fragP->fr_pcrel_adjust)
1758 aim += fragP->fr_pcrel_adjust;
1762 /* Look backwards. */
1763 for (next_state = this_type->rlx_more; next_state;)
1764 if (aim >= this_type->rlx_backward)
1768 /* Grow to next state. */
1769 this_state = next_state;
1770 this_type = md_relax_table + this_state;
1771 next_state = this_type->rlx_more;
1776 #ifdef M68K_AIM_KLUDGE
1777 M68K_AIM_KLUDGE (aim, this_state, this_type);
1779 /* Look forwards. */
1780 for (next_state = this_type->rlx_more; next_state;)
1781 if (aim <= this_type->rlx_forward)
1785 /* Grow to next state. */
1786 this_state = next_state;
1787 this_type = md_relax_table + this_state;
1788 next_state = this_type->rlx_more;
1792 growth = this_type->rlx_length - start_type->rlx_length;
1794 fragP->fr_subtype = this_state;
1800 BAD_CASE (fragP->fr_type);
1808 } /* For each frag in the segment. */
1810 while (stretched); /* Until nothing further to relax. */
1814 * We now have valid fr_address'es for each frag.
1818 * All fr_address's are correct, relative to their own segment.
1819 * We have made all the fixS we will ever make.
1821 } /* relax_segment() */
1823 #if defined (BFD_ASSEMBLER) || !defined (BFD)
1827 Go through all the fixS's in a segment and see which ones can be
1828 handled now. (These consist of fixS where we have since discovered
1829 the value of a symbol, or the address of the frag involved.)
1830 For each one, call md_apply_fix to put the fix into the frag data.
1832 Result is a count of how many relocation structs will be needed to
1833 handle the remaining fixS's that we couldn't completely handle here.
1834 These will be output later by emit_relocations(). */
1837 fixup_segment (fixP, this_segment_type)
1838 register fixS *fixP;
1839 segT this_segment_type; /* N_TYPE bits for segment. */
1841 long seg_reloc_count = 0;
1842 symbolS *add_symbolP;
1843 symbolS *sub_symbolP;
1850 segT add_symbol_segment = absolute_section;
1852 /* If the linker is doing the relaxing, we must not do any fixups.
1854 Well, strictly speaking that's not true -- we could do any that are
1855 PC-relative and don't cross regions that could change size. And for the
1856 i960 (the only machine for which we've got a relaxing linker right now),
1857 we might be able to turn callx/callj into bal anyways in cases where we
1858 know the maximum displacement. */
1861 for (; fixP; fixP = fixP->fx_next)
1863 TC_ADJUST_RELOC_COUNT (fixP, seg_reloc_count);
1864 return seg_reloc_count;
1867 for (; fixP; fixP = fixP->fx_next)
1869 fragP = fixP->fx_frag;
1871 where = fixP->fx_where;
1872 place = fragP->fr_literal + where;
1873 size = fixP->fx_size;
1874 add_symbolP = fixP->fx_addsy;
1875 #ifdef TC_VALIDATE_FIX
1876 TC_VALIDATE_FIX (fixP, this_segment_type, skip);
1878 sub_symbolP = fixP->fx_subsy;
1879 add_number = fixP->fx_offset;
1880 pcrel = fixP->fx_pcrel;
1883 add_symbol_segment = S_GET_SEGMENT (add_symbolP);
1890 if (S_GET_SEGMENT (sub_symbolP) == absolute_section)
1891 add_number -= S_GET_VALUE (sub_symbolP);
1893 && S_GET_SEGMENT (sub_symbolP) == this_segment_type)
1895 /* Should try converting to a constant. */
1900 as_bad ("Negative of non-absolute symbol %s",
1901 S_GET_NAME (sub_symbolP));
1903 else if ((S_GET_SEGMENT (sub_symbolP) == add_symbol_segment)
1904 && (SEG_NORMAL (add_symbol_segment)
1905 || (add_symbol_segment == absolute_section)))
1907 /* Difference of 2 symbols from same segment.
1908 Can't make difference of 2 undefineds: 'value' means
1909 something different for N_UNDF. */
1911 /* Makes no sense to use the difference of 2 arbitrary symbols
1912 as the target of a call instruction. */
1914 as_bad ("callj to difference of 2 symbols");
1915 #endif /* TC_I960 */
1916 add_number += S_GET_VALUE (add_symbolP) -
1917 S_GET_VALUE (sub_symbolP);
1921 /* Let the target machine make the final determination
1922 as to whether or not a relocation will be needed to
1923 handle this fixup. */
1924 if (!TC_FORCE_RELOCATION (fixP))
1926 fixP->fx_addsy = NULL;
1931 /* Different segments in subtraction. */
1932 know (!(S_IS_EXTERNAL (sub_symbolP)
1933 && (S_GET_SEGMENT (sub_symbolP) == absolute_section)));
1935 if ((S_GET_SEGMENT (sub_symbolP) == absolute_section))
1936 add_number -= S_GET_VALUE (sub_symbolP);
1939 else if (S_GET_SEGMENT (sub_symbolP) == this_segment_type
1940 #if 0 /* Do this even if it's already described as pc-relative. For example,
1941 on the m68k, an operand of "pc@(foo-.-2)" should address "foo" in a
1942 pc-relative mode. */
1947 /* Make it pc-relative. */
1948 add_number += (md_pcrel_from (fixP)
1949 - S_GET_VALUE (sub_symbolP));
1956 #ifdef BFD_ASSEMBLER
1957 else if (fixP->fx_r_type == BFD_RELOC_GPREL32
1958 || fixP->fx_r_type == BFD_RELOC_GPREL16)
1960 /* Leave it alone. */
1966 sprint_value (buf, fragP->fr_address + where);
1967 as_bad ("Can't emit reloc {- %s-seg symbol \"%s\"} @ file address %s.",
1968 segment_name (S_GET_SEGMENT (sub_symbolP)),
1969 S_GET_NAME (sub_symbolP), buf);
1976 if (add_symbol_segment == this_segment_type && pcrel)
1979 * This fixup was made when the symbol's segment was
1980 * SEG_UNKNOWN, but it is now in the local segment.
1981 * So we know how to do the address without relocation.
1984 /* reloc_callj() may replace a 'call' with a 'calls' or a
1985 'bal', in which cases it modifies *fixP as appropriate.
1986 In the case of a 'calls', no further work is required,
1987 and *fixP has been set up to make the rest of the code
1990 #endif /* TC_I960 */
1992 add_number += S_GET_VALUE (add_symbolP);
1993 add_number -= md_pcrel_from (fixP);
1994 pcrel = 0; /* Lie. Don't want further pcrel processing. */
1996 /* Let the target machine make the final determination
1997 as to whether or not a relocation will be needed to
1998 handle this fixup. */
1999 if (!TC_FORCE_RELOCATION (fixP))
2002 fixP->fx_addsy = NULL;
2007 if (add_symbol_segment == absolute_section)
2010 /* See comment about reloc_callj() above. */
2012 #endif /* TC_I960 */
2013 add_number += S_GET_VALUE (add_symbolP);
2015 /* Let the target machine make the final determination
2016 as to whether or not a relocation will be needed to
2017 handle this fixup. */
2018 if (!TC_FORCE_RELOCATION (fixP))
2020 fixP->fx_addsy = NULL;
2024 else if (add_symbol_segment == undefined_section
2025 #ifdef BFD_ASSEMBLER
2026 || bfd_is_com_section (add_symbol_segment)
2031 if ((int) fixP->fx_bit_fixP == 13)
2033 /* This is a COBR instruction. They have only a
2034 * 13-bit displacement and are only to be used
2035 * for local branches: flag as error, don't generate
2038 as_bad ("can't use COBR format with external label");
2039 fixP->fx_addsy = NULL;
2043 #endif /* TC_I960 */
2047 if (S_IS_COMMON (add_symbolP))
2048 add_number += S_GET_VALUE (add_symbolP);
2049 #endif /* TE_I386AIX */
2050 #endif /* OBJ_COFF */
2056 add_number += S_GET_VALUE (add_symbolP);
2063 add_number -= md_pcrel_from (fixP);
2064 if (add_symbolP == 0)
2066 fixP->fx_addsy = &abs_symbol;
2071 if (!fixP->fx_bit_fixP && size > 0)
2074 if (size < sizeof (mask))
2076 /* set all bits to one */
2078 /* Technically, combining these produces an undefined result
2079 if size is sizeof (valueT), though I think these two
2080 half-way operations should both be defined. And the
2081 compiler should be able to combine them if it's valid on
2082 the host architecture. */
2085 if ((add_number & mask) != 0
2086 && (add_number & mask) != mask)
2088 char buf[50], buf2[50];
2089 sprint_value (buf, fragP->fr_address + where);
2090 if (add_number > 1000)
2091 sprint_value (buf2, add_number);
2093 sprintf (buf2, "%ld", (long) add_number);
2094 as_bad_where (fixP->fx_file, fixP->fx_line,
2095 "Value of %s too large for field of %d bytes at %s",
2097 } /* generic error checking */
2099 #ifdef WARN_SIGNED_OVERFLOW_WORD
2100 /* Warn if a .word value is too large when treated as a signed
2101 number. We already know it is not too negative. This is to
2102 catch over-large switches generated by gcc on the 68k. */
2105 && add_number > 0x7fff)
2106 as_bad_where (fixP->fx_file, fixP->fx_line,
2107 "Signed .word overflow; switch may be too large; %ld at 0x%lx",
2109 (unsigned long) (fragP->fr_address + where));
2111 } /* not a bit fix */
2115 #ifdef BFD_ASSEMBLER
2116 md_apply_fix (fixP, &add_number);
2118 md_apply_fix (fixP, add_number);
2121 #ifndef TC_HANDLES_FX_DONE
2122 /* If the tc-* files haven't been converted, assume it's handling
2123 it the old way, where a null fx_addsy means that the fix has
2124 been applied completely, and no further work is needed. */
2125 if (fixP->fx_addsy == 0 && fixP->fx_pcrel == 0)
2129 #ifdef TC_VALIDATE_FIX
2133 } /* For each fixS in this segment. */
2135 TC_ADJUST_RELOC_COUNT (fixP, seg_reloc_count);
2136 return seg_reloc_count;
2139 #endif /* defined (BFD_ASSEMBLER) || !defined (BFD) */
2142 number_to_chars_bigendian (buf, val, n)
2147 if (n > sizeof (val)|| n <= 0)
2151 buf[n] = val & 0xff;
2157 number_to_chars_littleendian (buf, val, n)
2162 if (n > sizeof (val) || n <= 0)
2166 *buf++ = val & 0xff;
2171 /* end of write.c */