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- /* write.c - emit .o file
- Copyright (C) 1986, 1987, 1990, 1991, 1992, 1993 Free Software Foundation, Inc.
-
- This file is part of GAS, the GNU Assembler.
-
- GAS is free software; you can redistribute it and/or modify
- it under the terms of the GNU General Public License as published by
- the Free Software Foundation; either version 2, or (at your option)
- any later version.
-
- GAS is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- GNU General Public License for more details.
-
- You should have received a copy of the GNU General Public License
- along with GAS; see the file COPYING. If not, write to
- the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
-
- /* This thing should be set up to do byteordering correctly. But... */
-
- #include "as.h"
- #include "subsegs.h"
- #include "obstack.h"
- #include "output-file.h"
-
- /* The NOP_OPCODE is for the alignment fill value. Fill it with a nop
- instruction so that the disassembler does not choke on it. */
- #ifndef NOP_OPCODE
- #define NOP_OPCODE 0x00
- #endif
-
- #ifndef WORKING_DOT_WORD
- extern CONST int md_short_jump_size;
- extern CONST int md_long_jump_size;
- #endif
-
- #ifndef BFD_ASSEMBLER
-
- #ifndef MANY_SEGMENTS
- struct frag *text_frag_root;
- struct frag *data_frag_root;
- struct frag *bss_frag_root;
-
- struct frag *text_last_frag; /* Last frag in segment. */
- struct frag *data_last_frag; /* Last frag in segment. */
- static struct frag *bss_last_frag; /* Last frag in segment. */
- #endif
-
- static object_headers headers;
- long string_byte_count;
- static char *the_object_file;
- char *next_object_file_charP; /* Tracks object file bytes. */
-
- #ifndef OBJ_VMS
- int magic_number_for_object_file = DEFAULT_MAGIC_NUMBER_FOR_OBJECT_FILE;
- #endif
-
- #endif /* BFD_ASSEMBLER */
-
- static long fixup_segment PARAMS ((fixS * fixP, segT this_segment_type));
- static relax_addressT relax_align PARAMS ((relax_addressT addr, long align));
- void relax_segment PARAMS ((struct frag * seg_frag_root, segT seg_type));
-
- /*
- * fix_new()
- *
- * Create a fixS in obstack 'notes'.
- */
- fixS *
- fix_new (frag, where, size, add_symbol, sub_symbol, offset, pcrel, r_type)
- fragS *frag; /* Which frag? */
- int where; /* Where in that frag? */
- short int size; /* 1, 2, or 4 usually. */
- symbolS *add_symbol; /* X_add_symbol. */
- symbolS *sub_symbol; /* X_subtract_symbol. */
- long offset; /* X_add_number. */
- int pcrel; /* TRUE if PC-relative relocation. */
- #ifdef BFD_ASSEMBLER
- bfd_reloc_code_real_type r_type; /* Relocation type */
- #else
- int r_type; /* Relocation type */
- #endif
- {
- fixS *fixP;
-
- fixP = (fixS *) obstack_alloc (¬es, sizeof (fixS));
-
- fixP->fx_frag = frag;
- fixP->fx_where = where;
- fixP->fx_size = size;
- fixP->fx_addsy = add_symbol;
- fixP->fx_subsy = sub_symbol;
- fixP->fx_offset = offset;
- fixP->fx_pcrel = pcrel;
- #if defined(NEED_FX_R_TYPE) || defined (BFD_ASSEMBLER)
- fixP->fx_r_type = r_type;
- #endif
- fixP->fx_im_disp = 0;
- fixP->fx_pcrel_adjust = 0;
- fixP->fx_bit_fixP = 0;
- fixP->fx_addnumber = 0;
-
- #ifdef TC_something
- fixP->fx_bsr = 0;
- #endif
- #ifdef TC_I960
- fixP->fx_callj = 0;
- #endif
-
- /* Usually, we want relocs sorted numerically, but while
- comparing to older versions of gas that have relocs
- reverse sorted, it is convenient to have this compile
- time option. xoxorich. */
-
- {
-
- #ifdef BFD_ASSEMBLER
- fixS **seg_fix_rootP = & (seg_info (now_seg)->fix_root);
- fixS **seg_fix_tailP = & (seg_info (now_seg)->fix_tail);
- #endif
-
- #ifdef REVERSE_SORT_RELOCS
-
- fixP->fx_next = *seg_fix_rootP;
- *seg_fix_rootP = fixP;
-
- #else /* REVERSE_SORT_RELOCS */
-
- fixP->fx_next = NULL;
-
- if (*seg_fix_tailP)
- (*seg_fix_tailP)->fx_next = fixP;
- else
- *seg_fix_rootP = fixP;
- *seg_fix_tailP = fixP;
-
- #endif /* REVERSE_SORT_RELOCS */
-
- }
-
- return fixP;
- }
-
- /* Append a string onto another string, bumping the pointer along. */
- void
- append (charPP, fromP, length)
- char **charPP;
- char *fromP;
- unsigned long length;
- {
- /* Don't trust memcpy() of 0 chars. */
- if (length == 0)
- return;
-
- memcpy (*charPP, fromP, (int) length);
- *charPP += length;
- }
-
- #ifndef BFD_ASSEMBLER
- int section_alignment[SEG_MAXIMUM_ORDINAL];
- #endif
-
- /*
- * This routine records the largest alignment seen for each segment.
- * If the beginning of the segment is aligned on the worst-case
- * boundary, all of the other alignments within it will work. At
- * least one object format really uses this info.
- */
- void
- record_alignment (seg, align)
- /* Segment to which alignment pertains */
- segT seg;
- /* Alignment, as a power of 2 (e.g., 1 => 2-byte boundary, 2 => 4-byte
- boundary, etc.) */
- int align;
- {
- #ifdef BFD_ASSEMBLER
- if (align > bfd_get_section_alignment (stdoutput, seg))
- bfd_set_section_alignment (stdoutput, seg, align);
- #else
- if (align > section_alignment[(int) seg])
- section_alignment[(int) seg] = align;
- #endif
- }
-
- #if defined (BFD_ASSEMBLER) || ! defined (BFD)
-
- static fragS *
- chain_frchains_together_1 (section, frchp)
- segT section;
- struct frchain *frchp;
- {
- fragS dummy, *prev_frag = &dummy;
- for (; frchp && frchp->frch_seg == section; frchp = frchp->frch_next)
- {
- prev_frag->fr_next = frchp->frch_root;
- prev_frag = frchp->frch_last;
- }
- prev_frag->fr_next = 0;
- return prev_frag;
- }
-
- #endif
-
- #ifdef BFD_ASSEMBLER
-
- static void
- chain_frchains_together (abfd, section, xxx)
- bfd *abfd; /* unused */
- segT section;
- char *xxx; /* unused */
- {
- segment_info_type *info;
-
- /* BFD may have introduced its own sections without using
- subseg_new, so it is possible that seg_info is NULL. */
- info = seg_info (section);
- if (info != (segment_info_type *) NULL)
- chain_frchains_together_1 (section, info->frchainP);
- }
-
- #endif
-
- #ifndef BFD
-
- void
- remove_subsegs (head, seg, root, last)
- frchainS *head;
- int seg;
- fragS **root;
- fragS **last;
- {
- *root = head->frch_root;
- *last = chain_frchains_together_1 (seg, head);
- }
-
- #endif /* BFD */
-
- static void
- cvt_frag_to_fill (x, fragP)
- #ifdef BFD_ASSEMBLER
- segT x;
- #else
- object_headers *x;
- #endif
- fragS *fragP;
- {
- #ifdef BFD_ASSEMBLER
- segT sec = x;
- #else
- object_headers *headers = x;
- #endif
-
- switch (fragP->fr_type)
- {
- case rs_align:
- case rs_org:
- #ifdef HANDLE_ALIGN
- HANDLE_ALIGN (fragP);
- #endif
- fragP->fr_type = rs_fill;
- know (fragP->fr_var == 1);
- know (fragP->fr_next != NULL);
-
- fragP->fr_offset = (fragP->fr_next->fr_address
- - fragP->fr_address
- - fragP->fr_fix);
- break;
-
- case rs_fill:
- break;
-
- case rs_machine_dependent:
- #ifdef BFD_ASSEMBLER
- md_convert_frag (stdoutput, sec, fragP);
- #else
- md_convert_frag (headers, fragP);
- #endif
-
- assert (fragP->fr_next == NULL || (fragP->fr_next->fr_address - fragP->fr_address == fragP->fr_fix));
-
- /*
- * After md_convert_frag, we make the frag into a ".space 0".
- * Md_convert_frag() should set up any fixSs and constants
- * required.
- */
- frag_wane (fragP);
- break;
-
- #ifndef WORKING_DOT_WORD
- case rs_broken_word:
- {
- struct broken_word *lie;
-
- if (fragP->fr_subtype)
- {
- fragP->fr_fix += md_short_jump_size;
- for (lie = (struct broken_word *) (fragP->fr_symbol);
- lie && lie->dispfrag == fragP;
- lie = lie->next_broken_word)
- if (lie->added == 1)
- fragP->fr_fix += md_long_jump_size;
- }
- frag_wane (fragP);
- }
- break;
- #endif
-
- default:
- BAD_CASE (fragP->fr_type);
- break;
- }
- }
-
- #ifdef BFD_ASSEMBLER
- static void
- relax_and_size_seg (abfd, sec, xxx)
- bfd *abfd;
- asection *sec;
- char *xxx;
- {
- flagword flags;
-
- flags = bfd_get_section_flags (abfd, sec);
-
- if (flags & SEC_ALLOC)
- {
- fragS *fragp;
- segment_info_type *seginfo;
- int x;
- unsigned long size, newsize;
-
- seginfo = (segment_info_type *) bfd_get_section_userdata (abfd, sec);
- if (seginfo->frchainP)
- {
- relax_segment (seginfo->frchainP->frch_root, sec);
- for (fragp = seginfo->frchainP->frch_root; fragp; fragp = fragp->fr_next)
- cvt_frag_to_fill (sec, fragp);
- for (fragp = seginfo->frchainP->frch_root;
- fragp->fr_next;
- fragp = fragp->fr_next)
- /* walk to last elt */;
- size = fragp->fr_address;
- }
- else
- size = 0;
- if (size > 0)
- {
- flags |= SEC_HAS_CONTENTS;
- /* @@ This is just an approximation. */
- if (seginfo->fix_root)
- flags |= SEC_RELOC;
- x = bfd_set_section_flags (abfd, sec, flags);
- assert (x == true);
- }
- size = md_section_align (sec, size);
- x = bfd_set_section_size (abfd, sec, size);
- assert (x == true);
-
- /* If the size had to be rounded up, add some padding in the last
- non-empty frag. */
- newsize = bfd_get_section_size_before_reloc (sec);
- assert (newsize >= size);
- if (size != newsize)
- {
- fragS *last = seginfo->frchainP->frch_last;
- fragp = seginfo->frchainP->frch_root;
- while (fragp->fr_next != last)
- fragp = fragp->fr_next;
- last->fr_address = size;
- fragp->fr_offset += newsize - size;
- }
- }
- #ifdef tc_frob_section
- tc_frob_section (sec);
- #endif
- #ifdef obj_frob_section
- obj_frob_section (sec);
- #endif
- }
-
- static void
- write_contents (abfd, sec, xxx)
- bfd *abfd;
- asection *sec;
- char *xxx;
- {
- segment_info_type *seginfo = seg_info (sec);
- unsigned long offset = 0;
- fragS *frags;
- int i, n;
- arelent **relocs;
- fixS *fixp;
-
- if (! (bfd_get_section_flags (abfd, sec) & SEC_LOAD))
- return;
-
- fixup_segment (seginfo->fix_root, sec);
-
- n = 0;
- for (i = 0, fixp = seginfo->fix_root; fixp; fixp = fixp->fx_next)
- {
- n++;
- if (fixp->fx_addsy)
- {
- symbolS *sym = fixp->fx_addsy;
- asection *sec = sym->bsym->section;
- if (sec == &bfd_und_section
- || sec == &bfd_abs_section
- || sec == &bfd_com_section)
- continue;
- if (sym->bsym == sec->symbol)
- continue;
- /* If the section symbol isn't going to be output, the relocs
- at least should still work. If not, figure out what to do
- when we run into that case. */
- fixp->fx_offset += S_GET_VALUE (sym);
- fixp->fx_addsy = symbol_find (sec->name);
- if (!fixp->fx_addsy)
- {
- fixp->fx_addsy = symbol_make (sec->name);
- fixp->fx_addsy->bsym = sec->symbol;
- }
- }
- }
-
- /* Force calculations (size, vma) to get done. */
- bfd_set_section_contents (stdoutput, sec, "", 0, 0);
-
- /* Set up reloc information as well. */
- relocs = (arelent **) bfd_alloc_by_size_t (stdoutput,
- n * sizeof (arelent *));
-
- i = 0;
- for (fixp = seginfo->fix_root; fixp != (fixS *) NULL; fixp = fixp->fx_next)
- {
- arelent *reloc;
- extern arelent *tc_gen_reloc ();
- char *data;
- bfd_reloc_status_type s;
-
- if (fixp->fx_addsy == 0)
- {
- /* @@ Need some other flag to indicate which have already
- been performed... */
- n--;
- continue;
- }
- reloc = tc_gen_reloc (sec, fixp);
- if (!reloc)
- {
- n--;
- continue;
- }
- data = fixp->fx_frag->fr_literal + fixp->fx_where;
- if (fixp->fx_where + 4
- > fixp->fx_frag->fr_fix + fixp->fx_frag->fr_offset)
- abort ();
- s = bfd_perform_relocation (stdoutput, reloc, data - reloc->address,
- sec, stdoutput);
- switch (s)
- {
- case bfd_reloc_ok:
- break;
- default:
- as_fatal ("bad return from bfd_perform_relocation");
- }
- relocs[i++] = reloc;
- }
-
- if (n)
- bfd_set_reloc (stdoutput, sec, relocs, n);
-
- /* Write out the frags. */
- for (frags = seginfo->frchainP->frch_root;
- frags;
- frags = frags->fr_next)
- {
- int x;
- unsigned long fill_size;
- char *fill_literal;
- long count;
-
- assert (frags->fr_type == rs_fill);
- if (frags->fr_fix)
- {
- x = bfd_set_section_contents (stdoutput, sec,
- frags->fr_literal, offset,
- frags->fr_fix);
- assert (x == true);
- offset += frags->fr_fix;
- }
- fill_literal = frags->fr_literal + frags->fr_fix;
- fill_size = frags->fr_var;
- count = frags->fr_offset;
- assert (count >= 0);
- if (fill_size && count)
- while (count--)
- {
- x = bfd_set_section_contents (stdoutput, sec,
- fill_literal, offset, fill_size);
- assert (x == true);
- offset += fill_size;
- }
- }
- }
- #endif
-
- #if defined (BFD_ASSEMBLER) || !defined (BFD)
-
- void
- write_object_file ()
- {
- register struct frchain *frchainP; /* Track along all frchains. */
- register fragS *fragP; /* Track along all frags. */
- register struct frchain *next_frchainP;
- register fragS **prev_fragPP;
-
- long object_file_size;
-
- /* Do we really want to write it? */
- {
- int n_warns, n_errs;
- n_warns = had_warnings ();
- n_errs = had_errors ();
- /* The -Z flag indicates that an object file should be generated,
- regardless of warnings and errors. */
- if (flagseen['Z'])
- {
- if (n_warns || n_errs)
- as_warn ("%d error%s, %d warning%s, generating bad object file.\n",
- n_errs, n_errs == 1 ? "" : "s",
- n_warns, n_warns == 1 ? "" : "s");
- }
- else
- {
- if (n_errs)
- as_fatal ("%d error%s, %d warning%s, no object file generated.\n",
- n_errs, n_errs == 1 ? "" : "s",
- n_warns, n_warns == 1 ? "" : "s");
- }
- }
-
- #ifdef OBJ_VMS
- /*
- * Under VMS we try to be compatible with VAX-11 "C". Thus, we
- * call a routine to check for the definition of the procedure
- * "_main", and if so -- fix it up so that it can be program
- * entry point.
- */
- VMS_Check_For_Main ();
- #endif /* VMS */
-
- /* After every sub-segment, we fake an ".align ...". This conforms to
- BSD4.2 brane-damage. We then fake ".fill 0" because that is the kind of
- frag that requires least thought. ".align" frags like to have a
- following frag since that makes calculating their intended length
- trivial.
-
- @@ Is this really necessary?? */
- #ifndef SUB_SEGMENT_ALIGN
- #ifdef BFD_ASSEMBLER
- #define SUB_SEGMENT_ALIGN(SEG) (0)
- #else
- #define SUB_SEGMENT_ALIGN(SEG) (2)
- #endif
- #endif
- for (frchainP = frchain_root; frchainP; frchainP = frchainP->frch_next)
- {
- #ifdef BFD_ASSEMBLER
- subseg_set (frchainP->frch_seg, frchainP->frch_subseg);
- #else
- subseg_new (frchainP->frch_seg, frchainP->frch_subseg);
- #endif
- frag_align (SUB_SEGMENT_ALIGN (now_seg), NOP_OPCODE);
- /* frag_align will have left a new frag.
- Use this last frag for an empty ".fill".
-
- For this segment ...
- Create a last frag. Do not leave a "being filled in frag". */
- frag_wane (frag_now);
- frag_now->fr_fix = 0;
- know (frag_now->fr_next == NULL);
- /* know( frags . obstack_c_base == frags . obstack_c_next_free ); */
- /* Above shows we haven't left a half-completed object on obstack. */
- }
-
- /* From now on, we don't care about sub-segments. Build one frag chain
- for each segment. Linked thru fr_next. */
-
- #ifdef BFD_ASSEMBLER
- /* Remove the sections created by gas for its own purposes. */
- {
- asection **seclist, *sec;
- seclist = &stdoutput->sections;
- while (seclist && *seclist)
- {
- sec = *seclist;
- while (sec == big_section
- || sec == reg_section
- || sec == pass1_section
- || sec == diff_section
- || sec == absent_section)
- {
- sec = sec->next;
- *seclist = sec;
- stdoutput->section_count--;
- if (!sec)
- break;
- }
- if (*seclist)
- seclist = &(*seclist)->next;
- }
- }
-
- bfd_map_over_sections (stdoutput, chain_frchains_together, (char *) 0);
- #else
- remove_subsegs (frchain_root, SEG_TEXT, &text_frag_root, &text_last_frag);
- remove_subsegs (data0_frchainP, SEG_DATA, &data_frag_root, &data_last_frag);
- remove_subsegs (bss0_frchainP, SEG_BSS, &bss_frag_root, &bss_last_frag);
- #endif
-
- /* We have two segments. If user gave -R flag, then we must put the
- data frags into the text segment. Do this before relaxing so
- we know to take advantage of -R and make shorter addresses. */
- #if !defined (OBJ_AOUT) || defined (BFD_ASSEMBLER)
- if (flagseen['R'])
- {
- #ifdef BFD_ASSEMBLER
- seg_info (text_section)->frchainP->frch_last->fr_next =
- seg_info (data_section)->frchainP->frch_root;
- seg_info (text_section)->frchainP->frch_last =
- seg_info (data_section)->frchainP->frch_last;
- seg_info (data_section)->frchainP = 0;
- #else
- fixS *tmp;
-
- text_last_frag->fr_next = data_frag_root;
- text_last_frag = data_last_frag;
- data_last_frag = NULL;
- data_frag_root = NULL;
- if (text_fix_root)
- {
- for (tmp = text_fix_root; tmp->fx_next; tmp = tmp->fx_next);;
- tmp->fx_next = data_fix_root;
- text_fix_tail = data_fix_tail;
- }
- else
- text_fix_root = data_fix_root;
- data_fix_root = NULL;
- #endif
- }
- #endif
-
- #ifdef BFD_ASSEMBLER
- bfd_map_over_sections (stdoutput, relax_and_size_seg, (char *) 0);
- #else
- relax_segment (text_frag_root, SEG_TEXT);
- relax_segment (data_frag_root, SEG_DATA);
- relax_segment (bss_frag_root, SEG_BSS);
- /*
- * Now the addresses of frags are correct within the segment.
- */
-
- know (text_last_frag->fr_type == rs_fill && text_last_frag->fr_offset == 0);
- H_SET_TEXT_SIZE (&headers, text_last_frag->fr_address);
- text_last_frag->fr_address = H_GET_TEXT_SIZE (&headers);
-
- /*
- * Join the 2 segments into 1 huge segment.
- * To do this, re-compute every rn_address in the SEG_DATA frags.
- * Then join the data frags after the text frags.
- *
- * Determine a_data [length of data segment].
- */
- if (data_frag_root)
- {
- register relax_addressT slide;
-
- know ((text_last_frag->fr_type == rs_fill) && (text_last_frag->fr_offset == 0));
-
- H_SET_DATA_SIZE (&headers, data_last_frag->fr_address);
- data_last_frag->fr_address = H_GET_DATA_SIZE (&headers);
- slide = H_GET_TEXT_SIZE (&headers); /* & in file of the data segment. */
- #ifdef OBJ_BOUT
- #define RoundUp(N,S) (((N)+(S)-1)&-(S))
- /* For b.out: If the data section has a strict alignment
- requirement, its load address in the .o file will be
- rounded up from the size of the text section. These
- two values are *not* the same! Similarly for the bss
- section.... */
- slide = RoundUp (slide, 1 << section_alignment[SEG_DATA]);
- #endif
-
- for (fragP = data_frag_root; fragP; fragP = fragP->fr_next)
- {
- fragP->fr_address += slide;
- } /* for each data frag */
-
- know (text_last_frag != 0);
- text_last_frag->fr_next = data_frag_root;
- }
- else
- {
- H_SET_DATA_SIZE (&headers, 0);
- }
-
- #ifdef OBJ_BOUT
- /* See above comments on b.out data section address. */
- {
- long bss_vma;
- if (data_last_frag == 0)
- bss_vma = H_GET_TEXT_SIZE (&headers);
- else
- bss_vma = data_last_frag->fr_address;
- bss_vma = RoundUp (bss_vma, 1 << section_alignment[SEG_BSS]);
- bss_address_frag.fr_address = bss_vma;
- }
- #else /* ! OBJ_BOUT */
- bss_address_frag.fr_address = (H_GET_TEXT_SIZE (&headers) +
- H_GET_DATA_SIZE (&headers));
-
-
- /* Slide all the frags */
- if (bss_frag_root)
- {
- relax_addressT slide = bss_address_frag.fr_address;
-
- for (fragP = bss_frag_root; fragP; fragP = fragP->fr_next)
- {
- fragP->fr_address += slide;
- } /* for each bss frag */
- }
-
- #endif /* ! OBJ_BOUT */
-
- if (bss_last_frag)
- H_SET_BSS_SIZE (&headers,
- bss_last_frag->fr_address - bss_frag_root->fr_address);
- else
- H_SET_BSS_SIZE (&headers, 0);
- #endif /* BFD_ASSEMBLER */
-
- #ifndef BFD_ASSEMBLER
- /*
- *
- * Crawl the symbol chain.
- *
- * For each symbol whose value depends on a frag, take the address of
- * that frag and subsume it into the value of the symbol.
- * After this, there is just one way to lookup a symbol value.
- * Values are left in their final state for object file emission.
- * We adjust the values of 'L' local symbols, even if we do
- * not intend to emit them to the object file, because their values
- * are needed for fix-ups.
- *
- * Unless we saw a -L flag, remove all symbols that begin with 'L'
- * from the symbol chain. (They are still pointed to by the fixes.)
- *
- * Count the remaining symbols.
- * Assign a symbol number to each symbol.
- * Count the number of string-table chars we will emit.
- * Put this info into the headers as appropriate.
- *
- */
- know (zero_address_frag.fr_address == 0);
- string_byte_count = sizeof (string_byte_count);
-
- obj_crawl_symbol_chain (&headers);
-
- if (string_byte_count == sizeof (string_byte_count))
- string_byte_count = 0;
-
- H_SET_STRING_SIZE (&headers, string_byte_count);
-
- /*
- * Addresses of frags now reflect addresses we use in the object file.
- * Symbol values are correct.
- * Scan the frags, converting any ".org"s and ".align"s to ".fill"s.
- * Also converting any machine-dependent frags using md_convert_frag();
- */
- subseg_change (SEG_TEXT, 0);
-
- for (fragP = text_frag_root; fragP; fragP = fragP->fr_next)
- {
- cvt_frag_to_fill (&headers, fragP);
-
- /* Some assert macros don't work with # directives mixed in. */
- #ifndef NDEBUG
- if (!(fragP->fr_next == NULL
- #ifdef OBJ_BOUT
- || fragP->fr_next == data_frag_root
- #endif
- || ((fragP->fr_next->fr_address - fragP->fr_address)
- == (fragP->fr_fix + fragP->fr_offset * fragP->fr_var))))
- abort ();
- #endif
- }
- #endif /* ! BFD_ASSEMBLER */
-
- #ifndef WORKING_DOT_WORD
- {
- struct broken_word *lie;
- struct broken_word **prevP;
-
- prevP = &broken_words;
- for (lie = broken_words; lie; lie = lie->next_broken_word)
- if (!lie->added)
- {
- #ifdef BFD_ASSEMBLER
- fix_new (lie->frag, lie->word_goes_here - lie->frag->fr_literal,
- 2, lie->add, lie->sub, lie->addnum, 0, BFD_RELOC_NONE);
- #else
- #if defined(TC_SPARC) || defined(TC_A29K) || defined(NEED_FX_R_TYPE)
- fix_new (lie->frag, lie->word_goes_here - lie->frag->fr_literal,
- 2, lie->add,
- lie->sub, lie->addnum,
- 0, NO_RELOC);
- #else
- #ifdef TC_NS32K
- fix_new_ns32k (lie->frag,
- lie->word_goes_here - lie->frag->fr_literal,
- 2,
- lie->add,
- lie->sub,
- lie->addnum,
- 0, 0, 2, 0, 0);
- #else
- fix_new (lie->frag, lie->word_goes_here - lie->frag->fr_literal,
- 2, lie->add,
- lie->sub, lie->addnum,
- 0, 0);
- #endif /* TC_NS32K */
- #endif /* TC_SPARC|TC_A29K|NEED_FX_R_TYPE */
- #endif /* BFD_ASSEMBLER */
- *prevP = lie->next_broken_word;
- }
- else
- prevP = &(lie->next_broken_word);
-
- for (lie = broken_words; lie;)
- {
- struct broken_word *untruth;
- char *table_ptr;
- long table_addr;
- long from_addr, to_addr;
- int n, m;
-
- fragP = lie->dispfrag;
-
- /* Find out how many broken_words go here. */
- n = 0;
- for (untruth = lie; untruth && untruth->dispfrag == fragP; untruth = untruth->next_broken_word)
- if (untruth->added == 1)
- n++;
-
- table_ptr = lie->dispfrag->fr_opcode;
- table_addr = lie->dispfrag->fr_address + (table_ptr - lie->dispfrag->fr_literal);
- /* Create the jump around the long jumps. This is a short
- jump from table_ptr+0 to table_ptr+n*long_jump_size. */
- from_addr = table_addr;
- to_addr = table_addr + md_short_jump_size + n * md_long_jump_size;
- md_create_short_jump (table_ptr, from_addr, to_addr, lie->dispfrag, lie->add);
- table_ptr += md_short_jump_size;
- table_addr += md_short_jump_size;
-
- for (m = 0; lie && lie->dispfrag == fragP; m++, lie = lie->next_broken_word)
- {
- if (lie->added == 2)
- continue;
- /* Patch the jump table */
- /* This is the offset from ??? to table_ptr+0 */
- to_addr = table_addr
- - S_GET_VALUE (lie->sub);
- md_number_to_chars (lie->word_goes_here, to_addr, 2);
- for (untruth = lie->next_broken_word; untruth && untruth->dispfrag == fragP; untruth = untruth->next_broken_word)
- {
- if (untruth->use_jump == lie)
- md_number_to_chars (untruth->word_goes_here, to_addr, 2);
- }
-
- /* Install the long jump */
- /* this is a long jump from table_ptr+0 to the final target */
- from_addr = table_addr;
- to_addr = S_GET_VALUE (lie->add) + lie->addnum;
- md_create_long_jump (table_ptr, from_addr, to_addr, lie->dispfrag, lie->add);
- table_ptr += md_long_jump_size;
- table_addr += md_long_jump_size;
- }
- }
- }
- #endif /* not WORKING_DOT_WORD */
-
- #ifndef BFD_ASSEMBLER
- #ifndef OBJ_VMS
- { /* not vms */
- /*
- * Scan every FixS performing fixups. We had to wait until now to do
- * this because md_convert_frag() may have made some fixSs.
- */
- int trsize, drsize;
-
- subseg_change (SEG_TEXT, 0);
- trsize = md_reloc_size * fixup_segment (text_fix_root,
- SEG_TEXT);
- subseg_change (SEG_DATA, 0);
- drsize = md_reloc_size * fixup_segment (data_fix_root,
- SEG_DATA);
- H_SET_RELOCATION_SIZE (&headers, trsize, drsize);
-
- /* FIXME move this stuff into the pre-write-hook */
- H_SET_MAGIC_NUMBER (&headers, magic_number_for_object_file);
- H_SET_ENTRY_POINT (&headers, 0);
-
- obj_pre_write_hook (&headers); /* extra coff stuff */
-
- object_file_size = H_GET_FILE_SIZE (&headers);
- next_object_file_charP = the_object_file = xmalloc (object_file_size);
-
- output_file_create (out_file_name);
-
- obj_header_append (&next_object_file_charP, &headers);
-
- know ((next_object_file_charP - the_object_file) == H_GET_HEADER_SIZE (&headers));
-
- /*
- * Emit code.
- */
- for (fragP = text_frag_root; fragP; fragP = fragP->fr_next)
- {
- register long count;
- register char *fill_literal;
- register long fill_size;
-
- know (fragP->fr_type == rs_fill);
- append (&next_object_file_charP, fragP->fr_literal, (unsigned long) fragP->fr_fix);
- fill_literal = fragP->fr_literal + fragP->fr_fix;
- fill_size = fragP->fr_var;
- know (fragP->fr_offset >= 0);
-
- for (count = fragP->fr_offset; count; count--)
- {
- append (&next_object_file_charP, fill_literal, (unsigned long) fill_size);
- } /* for each */
-
- } /* for each code frag. */
-
- know ((next_object_file_charP - the_object_file) == (H_GET_HEADER_SIZE (&headers) + H_GET_TEXT_SIZE (&headers) + H_GET_DATA_SIZE (&headers)));
-
- /*
- * Emit relocations.
- */
- obj_emit_relocations (&next_object_file_charP, text_fix_root, (relax_addressT) 0);
- 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)));
- #ifdef TC_I960
- /* Make addresses in data relocation directives relative to beginning of
- * first data fragment, not end of last text fragment: alignment of the
- * start of the data segment may place a gap between the segments.
- */
- obj_emit_relocations (&next_object_file_charP, data_fix_root, data0_frchainP->frch_root->fr_address);
- #else /* TC_I960 */
- obj_emit_relocations (&next_object_file_charP, data_fix_root, text_last_frag->fr_address);
- #endif /* TC_I960 */
-
- 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)));
-
- /*
- * Emit line number entries.
- */
- OBJ_EMIT_LINENO (&next_object_file_charP, lineno_rootP, the_object_file);
- 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)));
-
- /*
- * Emit symbols.
- */
- obj_emit_symbols (&next_object_file_charP, symbol_rootP);
- 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)));
-
- /*
- * Emit strings.
- */
-
- if (string_byte_count > 0)
- {
- obj_emit_strings (&next_object_file_charP);
- } /* only if we have a string table */
-
- #ifdef BFD_HEADERS
- bfd_seek (stdoutput, 0, 0);
- bfd_write (the_object_file, 1, object_file_size, stdoutput);
- #else
-
- /* Write the data to the file */
- output_file_append (the_object_file, object_file_size, out_file_name);
- #endif
-
- output_file_close (out_file_name);
- } /* non vms output */
- #else /* VMS */
- /*
- * Now do the VMS-dependent part of writing the object file
- */
- VMS_write_object_file (H_GET_TEXT_SIZE (&headers),
- H_GET_DATA_SIZE (&headers),
- H_GET_BSS_SIZE (&headers),
- text_frag_root, data_frag_root);
- #endif /* VMS */
- #else /* BFD_ASSEMBLER */
-
- #ifdef obj_check_file_symbols
- obj_check_file_symbols ();
- #endif
-
- /* Set up symbol table, and write it out. */
- if (symbol_rootP)
- {
- int i = 0, n;
- symbolS *symp;
-
- for (symp = symbol_rootP; symp; symp = symbol_next (symp))
- {
- S_SET_VALUE (symp, S_GET_VALUE (symp) + symp->sy_frag->fr_address);
- /* So far, common symbols have been treated like undefined symbols.
- Put them in the common section now. */
- if (S_IS_DEFINED (symp) == 0
- && S_GET_VALUE (symp) != 0)
- S_SET_SEGMENT (symp, &bfd_com_section);
- #if 0
- printf ("symbol `%s'\n\t@%x: value=%d type=%d forward=%x seg=%s\n",
- S_GET_NAME (symp), symp,
- S_GET_VALUE (symp),
- S_GET_DATA_TYPE (symp),
- symp->sy_forward,
- segment_name (symp->bsym->section));
- #endif
- {
- int punt = 0;
- #ifdef obj_frob_symbol
- obj_frob_symbol (symp, punt);
- if (punt)
- goto punt_it;
- #endif
- #ifdef tc_frob_symbol
- tc_frob_symbol (symp, punt);
- if (punt)
- goto punt_it;
- #endif
- }
- /* If we don't want to keep this symbol, splice it out of the
- chain now. */
- if (S_IS_LOCAL (symp))
- {
- symbolS *prev, *next;
- punt_it:
- prev = symbol_previous (symp);
- next = symbol_next (symp);
- #ifdef DEBUG
- verify_symbol_chain_2 (symp);
- #endif
- if (prev)
- {
- symbol_next (prev) = next;
- symp = prev;
- }
- else if (symp == symbol_rootP)
- symbol_rootP = next;
- else
- abort ();
- if (next)
- symbol_previous (next) = prev;
- else
- symbol_lastP = prev;
- #ifdef DEBUG
- if (prev)
- verify_symbol_chain_2 (prev);
- else if (next)
- verify_symbol_chain_2 (next);
- #endif
- continue;
- }
- i++;
- }
- n = i;
- if (n)
- {
- asymbol **asympp;
- boolean result;
-
- asympp = (asymbol **) bfd_alloc (stdoutput, n * sizeof (asymbol *));
- symp = symbol_rootP;
- for (i = 0; i < n; i++, symp = symbol_next (symp))
- {
- asympp[i] = symp->bsym;
- symp->written = 1;
- }
- result = bfd_set_symtab (stdoutput, asympp, n);
- assert (result == true);
- }
- }
-
- #ifdef obj_frob_file
- obj_frob_file ();
- #endif
-
- /* Now that all the sizes are known, and contents correct, we can
- start writing the file. */
- bfd_map_over_sections (stdoutput, write_contents, (char *) 0);
-
- output_file_close (out_file_name);
- #endif /* BFD_ASSEMBLER */
- }
- #endif /* ! BFD */
-
- /*
- * relax_segment()
- *
- * Now we have a segment, not a crowd of sub-segments, we can make fr_address
- * values.
- *
- * Relax the frags.
- *
- * After this, all frags in this segment have addresses that are correct
- * within the segment. Since segments live in different file addresses,
- * these frag addresses may not be the same as final object-file addresses.
- */
-
-
- static int
- is_dnrange (f1, f2)
- struct frag *f1;
- struct frag *f2;
- {
- for (; f1; f1 = f1->fr_next)
- if (f1->fr_next == f2)
- return 1;
- return 0;
- }
-
- /* Relax_align. Advance location counter to next address that has 'alignment'
- lowest order bits all 0s. */
-
- /* How many addresses does the .align take? */
- static relax_addressT
- relax_align (address, alignment)
- register relax_addressT address; /* Address now. */
- register long alignment; /* Alignment (binary). */
- {
- relax_addressT mask;
- relax_addressT new_address;
-
- mask = ~((~0) << alignment);
- new_address = (address + mask) & (~mask);
- if (linkrelax)
- /* We must provide lots of padding, so the linker can discard it
- when needed. The linker will not add extra space, ever. */
- new_address += (1 << alignment);
- return (new_address - address);
- }
-
- void
- relax_segment (segment_frag_root, segment)
- struct frag *segment_frag_root;
- segT segment;
- {
- register struct frag *fragP;
- register relax_addressT address;
- #if !defined (MANY_SEGMENTS) && !defined (BFD_ASSEMBLER)
- know (segment == SEG_DATA || segment == SEG_TEXT || segment == SEG_BSS);
- #endif
- /* In case md_estimate_size_before_relax() wants to make fixSs. */
- subseg_change (segment, 0);
-
- /* For each frag in segment: count and store (a 1st guess of)
- fr_address. */
- address = 0;
- for (fragP = segment_frag_root; fragP; fragP = fragP->fr_next)
- {
- fragP->fr_address = address;
- address += fragP->fr_fix;
-
- switch (fragP->fr_type)
- {
- case rs_fill:
- address += fragP->fr_offset * fragP->fr_var;
- break;
-
- case rs_align:
- address += relax_align (address, fragP->fr_offset);
- break;
-
- case rs_org:
- /* Assume .org is nugatory. It will grow with 1st relax. */
- break;
-
- case rs_machine_dependent:
- address += md_estimate_size_before_relax (fragP, segment);
- break;
-
- #ifndef WORKING_DOT_WORD
- /* Broken words don't concern us yet */
- case rs_broken_word:
- break;
- #endif
-
- default:
- BAD_CASE (fragP->fr_type);
- break;
- } /* switch(fr_type) */
- } /* for each frag in the segment */
-
- /* Do relax(). */
- {
- long stretch; /* May be any size, 0 or negative. */
- /* Cumulative number of addresses we have */
- /* relaxed this pass. */
- /* We may have relaxed more than one address. */
- long stretched; /* Have we stretched on this pass? */
- /* This is 'cuz stretch may be zero, when, in fact some piece of code
- grew, and another shrank. If a branch instruction doesn't fit anymore,
- we could be scrod. */
-
- do
- {
- stretch = stretched = 0;
- for (fragP = segment_frag_root; fragP; fragP = fragP->fr_next)
- {
- long growth = 0;
- unsigned long was_address;
- long offset;
- symbolS *symbolP;
- long target;
- long after;
- long aim;
-
- was_address = fragP->fr_address;
- address = fragP->fr_address += stretch;
- symbolP = fragP->fr_symbol;
- offset = fragP->fr_offset;
-
- switch (fragP->fr_type)
- {
- case rs_fill: /* .fill never relaxes. */
- growth = 0;
- break;
-
- #ifndef WORKING_DOT_WORD
- /* JF: This is RMS's idea. I do *NOT* want to be blamed
- for it I do not want to write it. I do not want to have
- anything to do with it. This is not the proper way to
- implement this misfeature. */
- case rs_broken_word:
- {
- struct broken_word *lie;
- struct broken_word *untruth;
-
- /* Yes this is ugly (storing the broken_word pointer
- in the symbol slot). Still, this whole chunk of
- code is ugly, and I don't feel like doing anything
- about it. Think of it as stubbornness in action. */
- growth = 0;
- for (lie = (struct broken_word *) (fragP->fr_symbol);
- lie && lie->dispfrag == fragP;
- lie = lie->next_broken_word)
- {
-
- if (lie->added)
- continue;
-
- offset = (lie->add->sy_frag->fr_address
- + S_GET_VALUE (lie->add)
- + lie->addnum
- - (lie->sub->sy_frag->fr_address
- + S_GET_VALUE (lie->sub)));
- if (offset <= -32768 || offset >= 32767)
- {
- if (flagseen['K'])
- as_warn (".word %s-%s+%ld didn't fit",
- S_GET_NAME (lie->add),
- S_GET_NAME (lie->sub),
- lie->addnum);
- lie->added = 1;
- if (fragP->fr_subtype == 0)
- {
- fragP->fr_subtype++;
- growth += md_short_jump_size;
- }
- for (untruth = lie->next_broken_word;
- untruth && untruth->dispfrag == lie->dispfrag;
- untruth = untruth->next_broken_word)
- if ((untruth->add->sy_frag == lie->add->sy_frag)
- && S_GET_VALUE (untruth->add) == S_GET_VALUE (lie->add))
- {
- untruth->added = 2;
- untruth->use_jump = lie;
- }
- growth += md_long_jump_size;
- }
- }
-
- break;
- } /* case rs_broken_word */
- #endif
- case rs_align:
- growth = (relax_align ((relax_addressT) (address
- + fragP->fr_fix),
- offset)
- - relax_align ((relax_addressT) (was_address
- + fragP->fr_fix),
- offset));
- break;
-
- case rs_org:
- target = offset;
-
- if (symbolP)
- {
- #if !defined (MANY_SEGMENTS) && !defined (BFD_ASSEMBLER)
- know ((S_GET_SEGMENT (symbolP) == SEG_ABSOLUTE)
- || (S_GET_SEGMENT (symbolP) == SEG_DATA)
- || (S_GET_SEGMENT (symbolP) == SEG_TEXT)
- || S_GET_SEGMENT (symbolP) == SEG_BSS);
- know (symbolP->sy_frag);
- know (!(S_GET_SEGMENT (symbolP) == SEG_ABSOLUTE)
- || (symbolP->sy_frag == &zero_address_frag));
- #endif
- target += S_GET_VALUE (symbolP)
- + symbolP->sy_frag->fr_address;
- } /* if we have a symbol */
-
- know (fragP->fr_next);
- after = fragP->fr_next->fr_address;
- growth = ((target - after) > 0) ? (target - after) : 0;
- /* Growth may be negative, but variable part of frag
- cannot have fewer than 0 chars. That is, we can't
- .org backwards. */
-
- growth -= stretch; /* This is an absolute growth factor */
- break;
-
- case rs_machine_dependent:
- {
- const relax_typeS *this_type;
- const relax_typeS *start_type;
- relax_substateT next_state;
- relax_substateT this_state;
-
- this_state = fragP->fr_subtype;
- start_type = this_type = md_relax_table + this_state;
- target = offset;
-
- if (symbolP)
- {
- #if !defined (MANY_SEGMENTS) && !defined (BFD_ASSEMBLER)
- know ((S_GET_SEGMENT (symbolP) == SEG_ABSOLUTE)
- || (S_GET_SEGMENT (symbolP) == SEG_DATA)
- || (S_GET_SEGMENT (symbolP) == SEG_BSS)
- || (S_GET_SEGMENT (symbolP) == SEG_TEXT));
- #endif
- know (symbolP->sy_frag);
- know (!(S_GET_SEGMENT (symbolP) == absolute_section)
- || symbolP->sy_frag == &zero_address_frag);
- target +=
- S_GET_VALUE (symbolP)
- + symbolP->sy_frag->fr_address;
-
- /* If frag has yet to be reached on this pass,
- assume it will move by STRETCH just as we did.
- If this is not so, it will be because some frag
- between grows, and that will force another pass.
-
- Beware zero-length frags.
-
- There should be a faster way to do this. */
-
- if (symbolP->sy_frag->fr_address >= was_address
- && is_dnrange (fragP, symbolP->sy_frag))
- {
- target += stretch;
- }
- }
-
- aim = target - address - fragP->fr_fix;
- /* The displacement is affected by the instruction size
- for the 32k architecture. I think we ought to be able
- to add fragP->fr_pcrel_adjust in all cases (it should be
- zero if not used), but just in case it breaks something
- else we'll put this inside #ifdef NS32K ... #endif */
- #ifndef TC_NS32K
- if (fragP->fr_pcrel_adjust)
- abort ();
- #endif
- aim += fragP->fr_pcrel_adjust;
-
- if (aim < 0)
- {
- /* Look backwards. */
- for (next_state = this_type->rlx_more; next_state;)
- if (aim >= this_type->rlx_backward)
- next_state = 0;
- else
- {
- /* Grow to next state. */
- this_state = next_state;
- this_type = md_relax_table + this_state;
- next_state = this_type->rlx_more;
- }
- }
- else
- {
- #ifdef M68K_AIM_KLUDGE
- M68K_AIM_KLUDGE (aim, this_state, this_type);
- #endif
- /* Look forwards. */
- for (next_state = this_type->rlx_more; next_state;)
- if (aim <= this_type->rlx_forward)
- next_state = 0;
- else
- {
- /* Grow to next state. */
- this_state = next_state;
- this_type = md_relax_table + this_state;
- next_state = this_type->rlx_more;
- }
- }
-
- growth = this_type->rlx_length - start_type->rlx_length;
- if (growth != 0)
- fragP->fr_subtype = this_state;
- }
- break;
-
- default:
- BAD_CASE (fragP->fr_type);
- break;
- }
- if (growth)
- {
- stretch += growth;
- stretched++;
- }
- } /* For each frag in the segment. */
- }
- while (stretched); /* Until nothing further to relax. */
- } /* do_relax */
-
- /*
- * We now have valid fr_address'es for each frag.
- */
-
- /*
- * All fr_address's are correct, relative to their own segment.
- * We have made all the fixS we will ever make.
- */
- } /* relax_segment() */
-
- /* fixup_segment()
-
- Go through all the fixS's in a segment and see which ones can be
- handled now. (These consist of fixS where we have since discovered
- the value of a symbol, or the address of the frag involved.)
- For each one, call md_apply_fix to put the fix into the frag data.
-
- Result is a count of how many relocation structs will be needed to
- handle the remaining fixS's that we couldn't completely handle here.
- These will be output later by emit_relocations(). */
-
- static long
- fixup_segment (fixP, this_segment_type)
- register fixS *fixP;
- segT this_segment_type; /* N_TYPE bits for segment. */
- {
- register long seg_reloc_count;
- register symbolS *add_symbolP;
- register symbolS *sub_symbolP;
- long add_number;
- register int size;
- register char *place;
- register long where;
- register char pcrel;
- register fragS *fragP;
- register segT add_symbol_segment = absolute_section;
-
- seg_reloc_count = 0;
- /* If the linker is doing the relaxing, we must not do any fixups */
- if (linkrelax)
- for (; fixP; fixP = fixP->fx_next)
- seg_reloc_count++;
- else
- for (; fixP; fixP = fixP->fx_next)
- {
- fragP = fixP->fx_frag;
- know (fragP);
- where = fixP->fx_where;
- place = fragP->fr_literal + where;
- size = fixP->fx_size;
- add_symbolP = fixP->fx_addsy;
- #ifdef TC_I960
- if (fixP->fx_callj && TC_S_IS_CALLNAME (add_symbolP))
- {
- /* Relocation should be done via the associated 'bal'
- entry point symbol. */
-
- if (!TC_S_IS_BALNAME (tc_get_bal_of_call (add_symbolP)))
- {
- as_bad ("No 'bal' entry point for leafproc %s",
- S_GET_NAME (add_symbolP));
- continue;
- }
- fixP->fx_addsy = add_symbolP = tc_get_bal_of_call (add_symbolP);
- }
- #endif
- sub_symbolP = fixP->fx_subsy;
- add_number = fixP->fx_offset;
- pcrel = fixP->fx_pcrel;
-
- if (add_symbolP)
- add_symbol_segment = S_GET_SEGMENT (add_symbolP);
-
- if (sub_symbolP)
- {
- if (!add_symbolP)
- {
- /* Its just -sym */
- if (S_GET_SEGMENT (sub_symbolP) != absolute_section)
- as_bad ("Negative of non-absolute symbol %s",
- S_GET_NAME (sub_symbolP));
-
- add_number -= S_GET_VALUE (sub_symbolP);
- }
- else if ((S_GET_SEGMENT (sub_symbolP) == add_symbol_segment)
- && (SEG_NORMAL (add_symbol_segment)
- || (add_symbol_segment == absolute_section)))
- {
- /* Difference of 2 symbols from same segment.
- Can't make difference of 2 undefineds: 'value' means
- something different for N_UNDF. */
- #ifdef TC_I960
- /* Makes no sense to use the difference of 2 arbitrary symbols
- as the target of a call instruction. */
- if (fixP->fx_callj)
- {
- as_bad ("callj to difference of 2 symbols");
- }
- #endif /* TC_I960 */
- add_number += S_GET_VALUE (add_symbolP) -
- S_GET_VALUE (sub_symbolP);
-
- add_symbolP = NULL;
- fixP->fx_addsy = NULL;
- }
- else
- {
- /* Different segments in subtraction. */
- know (!(S_IS_EXTERNAL (sub_symbolP)
- && (S_GET_SEGMENT (sub_symbolP) == absolute_section)));
-
- if ((S_GET_SEGMENT (sub_symbolP) == absolute_section))
- {
- add_number -= S_GET_VALUE (sub_symbolP);
- }
- else
- {
- as_bad ("Can't emit reloc {- %s-seg symbol \"%s\"} @ file address %d.",
- segment_name (S_GET_SEGMENT (sub_symbolP)),
- S_GET_NAME (sub_symbolP), fragP->fr_address + where);
- } /* if absolute */
- }
- } /* if sub_symbolP */
-
- if (add_symbolP)
- {
- if (add_symbol_segment == this_segment_type && pcrel)
- {
- /*
- * This fixup was made when the symbol's segment was
- * SEG_UNKNOWN, but it is now in the local segment.
- * So we know how to do the address without relocation.
- */
- #ifdef TC_I960
- /* reloc_callj() may replace a 'call' with a 'calls' or a
- 'bal', in which cases it modifies *fixP as appropriate.
- In the case of a 'calls', no further work is required,
- and *fixP has been set up to make the rest of the code
- below a no-op. */
- reloc_callj (fixP);
- #endif /* TC_I960 */
-
- add_number += S_GET_VALUE (add_symbolP);
- add_number -= md_pcrel_from (fixP);
- pcrel = 0; /* Lie. Don't want further pcrel processing. */
- fixP->fx_addsy = NULL; /* No relocations please. */
- }
- else
- {
- if (add_symbol_segment == absolute_section)
- {
- #ifdef TC_I960
- /* See comment about reloc_callj() above. */
- reloc_callj (fixP);
- #endif /* TC_I960 */
- add_number += S_GET_VALUE (add_symbolP);
- fixP->fx_addsy = NULL;
- add_symbolP = NULL;
- }
- else if (add_symbol_segment == undefined_section
- #ifdef BFD_ASSEMBLER
- || add_symbol_segment == &bfd_com_section
- #endif
- )
- {
- #ifdef TC_I960
- if ((int) fixP->fx_bit_fixP == 13)
- {
- /* This is a COBR instruction. They have only a
- * 13-bit displacement and are only to be used
- * for local branches: flag as error, don't generate
- * relocation.
- */
- as_bad ("can't use COBR format with external label");
- fixP->fx_addsy = NULL; /* No relocations please. */
- continue;
- } /* COBR */
- #endif /* TC_I960 */
-
- #ifdef OBJ_COFF
- #ifdef TE_I386AIX
- if (S_IS_COMMON (add_symbolP))
- add_number += S_GET_VALUE (add_symbolP);
- #endif /* TE_I386AIX */
- #endif /* OBJ_COFF */
- ++seg_reloc_count;
- }
- else
- {
- seg_reloc_count++;
- add_number += S_GET_VALUE (add_symbolP);
- }
- } /* if not in local seg */
- } /* if there was a + symbol */
-
- if (pcrel)
- {
- add_number -= md_pcrel_from (fixP);
- if (add_symbolP == 0)
- {
- fixP->fx_addsy = &abs_symbol;
- ++seg_reloc_count;
- } /* if there's an add_symbol */
- } /* if pcrel */
-
- if (!fixP->fx_bit_fixP)
- {
- if ((size == 1 &&
- (add_number & ~0xFF)
- && ((add_number & ~0xFF) != (-1 & ~0xFF)))
- || (size == 2
- && (add_number & ~0xFFFF)
- && ((add_number & ~0xFFFF) != (-1 & ~0xFFFF))))
- {
- as_bad ("Value of %d too large for field of %d bytes at 0x%x",
- add_number, size, fragP->fr_address + where);
- } /* generic error checking */
- #ifdef WARN_SIGNED_OVERFLOW_WORD
- /* Warn if a .word value is too large when treated as a signed
- number. We already know it is not too negative. This is to
- catch over-large switches generated by gcc on the 68k. */
- if (!flagseen['J']
- && size == 2
- && add_number > 0x7fff)
- as_bad ("Signed .word overflow; switch may be too large; %d at 0x%x",
- add_number, fragP->fr_address + where);
- #endif
- } /* not a bit fix */
-
- #ifdef BFD_ASSEMBLER
- md_apply_fix (fixP, &add_number);
- #else
- md_apply_fix (fixP, add_number);
- #endif
- } /* For each fixS in this segment. */
-
- #ifdef OBJ_COFF
- #ifdef TC_I960
- {
- fixS *topP = fixP;
-
- /* two relocs per callj under coff. */
- for (fixP = topP; fixP; fixP = fixP->fx_next)
- {
- if (fixP->fx_callj && fixP->fx_addsy != 0)
- {
- ++seg_reloc_count;
- } /* if callj and not already fixed. */
- } /* for each fix */
- }
- #endif /* TC_I960 */
-
- #endif /* OBJ_COFF */
- return (seg_reloc_count);
- } /* fixup_segment() */
-
- /* end of write.c */
-