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4acf8c78e6
binutils-gdb/gas/write.c
Ken Raeburn 4acf8c78e6 (fix_new_exp): Handle O_add by creating an expression-valued symbol, and 
calling fix_new_exp recursively.
(adjust_reloc_syms): If a fixup's symbol value is a sum of an undefined symbol
and a constant, fold the constant into the fixup, and refer to the undefined
symbol directly.  Then process the fixup again from scratch.
(write_object_file): Before calling adjust_reloc_syms, make a pass through the
symbol list trying to resolve values.

(print_fixup): New routine, for debugging.
(write_relocs): Call bfd_install_relocation.  Deleted various hacks for working
around problems with bfd_perform_relocation.
1994-09-28 19:20:11 +00:00

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/* write.c - emit .o file
Copyright (C) 1986, 87, 90, 91, 92, 93, 1994 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"
/* This looks like a good idea. Let's try turning it on always, for now. */
#undef BFD_FAST_SECTION_FILL
#define BFD_FAST_SECTION_FILL
/* 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 TC_ADJUST_RELOC_COUNT
#define TC_ADJUST_RELOC_COUNT(FIXP,COUNT)
#endif
#ifndef TC_FORCE_RELOCATION
#define TC_FORCE_RELOCATION(FIXP) 0
#endif
#ifndef WORKING_DOT_WORD
extern CONST int md_short_jump_size;
extern CONST int md_long_jump_size;
#endif
int symbol_table_frozen;
#ifdef BFD_ASSEMBLER
/* We generally attach relocs to frag chains. However, after we have
chained these all together into a segment, any relocs we add after
that must be attached to a segment. This will include relocs added
in md_estimate_size_for_relax, for example. */
static int frags_chained = 0;
#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
#ifndef BFD
static object_headers headers;
static char *the_object_file;
#endif
long string_byte_count;
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 */
#ifdef BFD_ASSEMBLER
static fixS *fix_new_internal PARAMS ((fragS *, int where, int size,
symbolS *add, symbolS *sub,
offsetT offset, int pcrel,
bfd_reloc_code_real_type r_type));
#else
static fixS *fix_new_internal PARAMS ((fragS *, int where, int size,
symbolS *add, symbolS *sub,
offsetT offset, int pcrel,
int r_type));
#endif
#if defined (BFD_ASSEMBLER) || !defined (BFD)
static long fixup_segment PARAMS ((fixS * fixP, segT this_segment_type));
#endif
static relax_addressT relax_align PARAMS ((relax_addressT addr, int align));
/*
* fix_new()
*
* Create a fixS in obstack 'notes'.
*/
static fixS *
fix_new_internal (frag, where, size, add_symbol, sub_symbol, offset, pcrel,
r_type)
fragS *frag; /* Which frag? */
int where; /* Where in that frag? */
int size; /* 1, 2, or 4 usually. */
symbolS *add_symbol; /* X_add_symbol. */
symbolS *sub_symbol; /* X_op_symbol. */
offsetT 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 (&notes, 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;
fixP->tc_fix_data = NULL;
fixP->fx_tcbit = 0;
fixP->fx_done = 0;
#ifdef TC_something
fixP->fx_bsr = 0;
#endif
as_where (&fixP->fx_file, &fixP->fx_line);
/* 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 = (frags_chained
? &seg_info (now_seg)->fix_root
: &frchain_now->fix_root);
fixS **seg_fix_tailP = (frags_chained
? &seg_info (now_seg)->fix_tail
: &frchain_now->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;
}
/* Create a fixup relative to a symbol (plus a constant). */
fixS *
fix_new (frag, where, size, add_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. */
offsetT 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
{
return fix_new_internal (frag, where, size, add_symbol,
(symbolS *) NULL, offset, pcrel, r_type);
}
/* Create a fixup for an expression. Currently we only support fixups
for difference expressions. That is itself more than most object
file formats support anyhow. */
fixS *
fix_new_exp (frag, where, size, exp, pcrel, r_type)
fragS *frag; /* Which frag? */
int where; /* Where in that frag? */
short int size; /* 1, 2, or 4 usually. */
expressionS *exp; /* Expression. */
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
{
symbolS *add = NULL;
symbolS *sub = NULL;
offsetT off = 0;
switch (exp->X_op)
{
case O_absent:
break;
case O_add:
/* This comes up when _GLOBAL_OFFSET_TABLE_+(.-L0) is read, if
the difference expression cannot immediately be reduced. */
{
extern symbolS *make_expr_symbol ();
symbolS *stmp = make_expr_symbol (exp);
exp->X_op = O_symbol;
exp->X_op_symbol = 0;
exp->X_add_symbol = stmp;
exp->X_add_number = 0;
return fix_new_exp (frag, where, size, exp, pcrel, r_type);
}
case O_uminus:
sub = exp->X_add_symbol;
off = exp->X_add_number;
break;
case O_subtract:
sub = exp->X_op_symbol;
/* Fall through. */
case O_symbol:
add = exp->X_add_symbol;
/* Fall through. */
case O_constant:
off = exp->X_add_number;
break;
default:
as_bad ("expression too complex for fixup");
}
return fix_new_internal (frag, where, size, add, sub, off,
pcrel, r_type);
}
/* 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, 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;
fixS fix_dummy, *prev_fix = &fix_dummy;
for (; frchp && frchp->frch_seg == section; frchp = frchp->frch_next)
{
prev_frag->fr_next = frchp->frch_root;
prev_frag = frchp->frch_last;
#ifdef BFD_ASSEMBLER
if (frchp->fix_root != (fixS *) NULL)
{
if (seg_info (section)->fix_root == (fixS *) NULL)
seg_info (section)->fix_root = frchp->fix_root;
prev_fix->fx_next = frchp->fix_root;
seg_info (section)->fix_tail = frchp->fix_tail;
prev_fix = frchp->fix_tail;
}
#endif
}
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;
PTR 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)
info->frchainP->frch_last
= chain_frchains_together_1 (section, info->frchainP);
/* Now that we've chained the frags together, we must add new fixups
to the segment, not to the frag chain. */
frags_chained = 1;
}
#endif
#if !defined (BFD) && !defined (BFD_ASSEMBLER)
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 */
#if defined (BFD_ASSEMBLER) || !defined (BFD)
#ifdef BFD_ASSEMBLER
static void
cvt_frag_to_fill (sec, fragP)
segT sec;
fragS *fragP;
#else
static void
cvt_frag_to_fill (headers, fragP)
object_headers *headers;
fragS *fragP;
#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_next != NULL);
fragP->fr_offset = (fragP->fr_next->fr_address
- fragP->fr_address
- fragP->fr_fix) / fragP->fr_var;
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;
}
}
#endif /* defined (BFD_ASSEMBLER) || !defined (BFD) */
#ifdef BFD_ASSEMBLER
static void
relax_and_size_seg (abfd, sec, xxx)
bfd *abfd;
asection *sec;
PTR xxx;
{
flagword flags;
fragS *fragp;
segment_info_type *seginfo;
int x;
valueT size, newsize;
flags = bfd_get_section_flags (abfd, sec);
seginfo = seg_info (sec);
if (seginfo && 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 + fragp->fr_fix;
}
else
size = 0;
if (size > 0 && ! seginfo->bss)
flags |= SEC_HAS_CONTENTS;
/* @@ This is just an approximation. */
if (seginfo && seginfo->fix_root)
flags |= SEC_RELOC;
else
flags &= ~SEC_RELOC;
x = bfd_set_section_flags (abfd, sec, flags);
assert (x == true);
newsize = md_section_align (sec, size);
x = bfd_set_section_size (abfd, sec, newsize);
assert (x == true);
/* If the size had to be rounded up, add some padding in the last
non-empty frag. */
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
}
#ifdef DEBUG2
static void
dump_section_relocs (abfd, sec, stream_)
bfd *abfd;
asection *sec;
char *stream_;
{
FILE *stream = (FILE *) stream_;
segment_info_type *seginfo = seg_info (sec);
fixS *fixp = seginfo->fix_root;
if (!fixp)
return;
fprintf (stream, "sec %s relocs:\n", sec->name);
while (fixp)
{
symbolS *s = fixp->fx_addsy;
if (s)
{
fprintf (stream, " %08x: %s(%s", fixp, S_GET_NAME (s),
s->bsym->section->name);
if (s->bsym->flags & BSF_SECTION_SYM)
{
fprintf (stream, " section sym");
if (S_GET_VALUE (s))
fprintf (stream, "+%x", S_GET_VALUE (s));
}
else
fprintf (stream, "+%x", S_GET_VALUE (s));
fprintf (stream, ")+%x\n", fixp->fx_offset);
}
else
fprintf (stream, " %08x: type %d no sym\n", fixp, fixp->fx_r_type);
fixp = fixp->fx_next;
}
}
#else
#define dump_section_relocs(ABFD,SEC,STREAM) (void)(ABFD,SEC,STREAM)
#endif
#ifndef EMIT_SECTION_SYMBOLS
#define EMIT_SECTION_SYMBOLS 1
#endif
static void
adjust_reloc_syms (abfd, sec, xxx)
bfd *abfd;
asection *sec;
PTR xxx;
{
segment_info_type *seginfo = seg_info (sec);
fixS *fixp;
if (seginfo == NULL)
return;
dump_section_relocs (abfd, sec, stderr);
for (fixp = seginfo->fix_root; fixp; fixp = fixp->fx_next)
if (fixp->fx_done)
/* ignore it */;
else if (fixp->fx_addsy)
{
symbolS *sym = fixp->fx_addsy;
asection *symsec;
reduce_fixup:
symsec = sym->bsym->section;
/* If it's one of these sections, assume the symbol is
definitely going to be output. The code in
md_estimate_size_before_relax in tc-mips.c uses this test
as well, so if you change this code you should look at that
code. */
if (symsec == &bfd_und_section
|| symsec == &bfd_abs_section
|| bfd_is_com_section (symsec))
{
fixp->fx_addsy->sy_used_in_reloc = 1;
continue;
}
/* Since we're reducing to section symbols, don't attempt to reduce
anything that's already using one. */
if (sym->bsym->flags & BSF_SECTION_SYM)
{
fixp->fx_addsy->sy_used_in_reloc = 1;
continue;
}
/* Is there some other reason we can't adjust this one? (E.g.,
call/bal links in i960-bout symbols.) */
#ifdef obj_fix_adjustable
if (! obj_fix_adjustable (fixp))
{
fixp->fx_addsy->sy_used_in_reloc = 1;
continue;
}
#endif
/* Is there some other (target cpu dependent) reason we can't adjust
this one? (E.g. relocations involving function addresses on
the PA. */
#ifdef tc_fix_adjustable
if (! tc_fix_adjustable (fixp))
{
fixp->fx_addsy->sy_used_in_reloc = 1;
continue;
}
#endif
/* For PIC support: We may get expressions like
"_GLOBAL_OFFSET_TABLE_+(.-L5)" where "." and "L5" may not
necessarily have had a fixed difference initially. But now
it should be a known constant, so we can reduce it. Since
we can't easily handle a symbol value that looks like
someUndefinedSymbol+const, though, we convert the fixup to
access the undefined symbol directly, and discard the
intermediate symbol. */
if (S_GET_SEGMENT (sym) == expr_section
&& sym->sy_value.X_op == O_add
&& (resolve_symbol_value (sym->sy_value.X_add_symbol),
S_GET_SEGMENT (sym->sy_value.X_add_symbol) == undefined_section)
&& (resolve_symbol_value (sym->sy_value.X_op_symbol),
S_GET_SEGMENT (sym->sy_value.X_op_symbol) == absolute_section))
{
fixp->fx_offset += S_GET_VALUE (sym->sy_value.X_op_symbol);
fixp->fx_offset += sym->sy_value.X_add_number;
fixp->fx_addsy = sym = sym->sy_value.X_add_symbol;
goto reduce_fixup;
}
/* 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);
if (sym->sy_frag)
fixp->fx_offset += sym->sy_frag->fr_address;
fixp->fx_addsy = section_symbol (symsec);
fixp->fx_addsy->sy_used_in_reloc = 1;
}
#if 1/*def RELOC_REQUIRES_SYMBOL*/
else
{
/* There was no symbol required by this relocation. However,
BFD doesn't really handle relocations without symbols well.
(At least, the COFF support doesn't.) So for now we fake up
a local symbol in the absolute section. */
fixp->fx_addsy = section_symbol (absolute_section);
fixp->fx_addsy->sy_used_in_reloc = 1;
}
#endif
dump_section_relocs (abfd, sec, stderr);
}
static void
write_relocs (abfd, sec, xxx)
bfd *abfd;
asection *sec;
PTR xxx;
{
segment_info_type *seginfo = seg_info (sec);
int i;
unsigned int n;
arelent **relocs;
fixS *fixp;
char *err;
/* If seginfo is NULL, we did not create this section; don't do
anything with it. */
if (seginfo == NULL)
return;
fixup_segment (seginfo->fix_root, sec);
n = 0;
for (fixp = seginfo->fix_root; fixp; fixp = fixp->fx_next)
n++;
#ifndef RELOC_EXPANSION_POSSIBLE
/* Set up reloc information as well. */
relocs = (arelent **) bfd_alloc_by_size_t (stdoutput,
n * sizeof (arelent *));
memset ((char*)relocs, 0, n * sizeof (arelent*));
i = 0;
for (fixp = seginfo->fix_root; fixp != (fixS *) NULL; fixp = fixp->fx_next)
{
arelent *reloc;
bfd_reloc_status_type s;
if (fixp->fx_done)
{
n--;
continue;
}
reloc = tc_gen_reloc (sec, fixp);
if (!reloc)
{
n--;
continue;
}
if (fixp->fx_where + fixp->fx_size
> fixp->fx_frag->fr_fix + fixp->fx_frag->fr_offset)
abort ();
s = bfd_install_relocation (stdoutput, reloc,
fixp->fx_frag->fr_literal,
fixp->fx_frag->fr_address,
sec, &err);
switch (s)
{
case bfd_reloc_ok:
break;
case bfd_reloc_overflow:
as_bad_where (fixp->fx_file, fixp->fx_line, "relocation overflow");
break;
default:
as_fatal ("%s:%u: bad return from bfd_perform_relocation",
fixp->fx_file, fixp->fx_line);
}
relocs[i++] = reloc;
}
#else
n = n * MAX_RELOC_EXPANSION;
/* 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;
char *data;
bfd_reloc_status_type s;
int j;
if (fixp->fx_done)
{
n--;
continue;
}
reloc = tc_gen_reloc (sec, fixp);
for (j = 0; reloc[j]; j++)
{
relocs[i++] = reloc[j];
assert(i <= n);
}
data = fixp->fx_frag->fr_literal + fixp->fx_where;
if (fixp->fx_where + fixp->fx_size
> fixp->fx_frag->fr_fix + fixp->fx_frag->fr_offset)
abort ();
for (j = 0; reloc[j]; j++)
{
s = bfd_perform_relocation (stdoutput, reloc[j],
data - reloc[0]->address,
sec, stdoutput, &err);
switch (s)
{
case bfd_reloc_ok:
break;
case bfd_reloc_overflow:
as_bad_where (fixp->fx_file, fixp->fx_line,
"relocation overflow");
break;
default:
as_fatal ("%s:%u: bad return from bfd_perform_relocation",
fixp->fx_file, fixp->fx_line);
}
}
}
n = i;
#endif
#ifdef DEBUG4
{
int i, j, nsyms;
asymbol **sympp;
sympp = bfd_get_outsymbols (stdoutput);
nsyms = bfd_get_symcount (stdoutput);
for (i = 0; i < n; i++)
if (((*relocs[i]->sym_ptr_ptr)->flags & BSF_SECTION_SYM) == 0)
{
for (j = 0; j < nsyms; j++)
if (sympp[j] == *relocs[i]->sym_ptr_ptr)
break;
if (j == nsyms)
abort ();
}
}
#endif
if (n)
bfd_set_reloc (stdoutput, sec, relocs, n);
else
bfd_set_section_flags (abfd, sec,
(bfd_get_section_flags (abfd, sec)
& (flagword) ~SEC_RELOC));
#ifdef DEBUG3
{
int i;
arelent *r;
asymbol *s;
fprintf (stderr, "relocs for sec %s\n", sec->name);
for (i = 0; i < n; i++)
{
r = relocs[i];
s = *r->sym_ptr_ptr;
fprintf (stderr, " reloc %2d @%08x off %4x : sym %-10s addend %x\n",
i, r, r->address, s->name, r->addend);
}
}
#endif
}
static void
write_contents (abfd, sec, xxx)
bfd *abfd;
asection *sec;
PTR xxx;
{
segment_info_type *seginfo = seg_info (sec);
unsigned long offset = 0;
fragS *f;
/* Write out the frags. */
if (seginfo == NULL
|| ! (bfd_get_section_flags (abfd, sec) & SEC_HAS_CONTENTS))
return;
for (f = seginfo->frchainP->frch_root;
f;
f = f->fr_next)
{
int x;
unsigned long fill_size;
char *fill_literal;
long count;
assert (f->fr_type == rs_fill);
if (f->fr_fix)
{
x = bfd_set_section_contents (stdoutput, sec,
f->fr_literal, (file_ptr) offset,
(bfd_size_type) f->fr_fix);
if (x == false)
{
bfd_perror (stdoutput->filename);
as_perror ("FATAL: Can't write %s", stdoutput->filename);
exit (EXIT_FAILURE);
}
offset += f->fr_fix;
}
fill_literal = f->fr_literal + f->fr_fix;
fill_size = f->fr_var;
count = f->fr_offset;
assert (count >= 0);
if (fill_size && count)
#ifdef BFD_FAST_SECTION_FILL
{
char buf[256];
if (fill_size > sizeof(buf)) {
/* Do it the old way. Can this ever happen? */
while (count--)
{
x = bfd_set_section_contents (stdoutput, sec,
fill_literal, (file_ptr) offset,
(bfd_size_type) fill_size);
if (x == false)
{
bfd_perror (stdoutput->filename);
as_perror ("FATAL: Can't write %s", stdoutput->filename);
exit (EXIT_FAILURE);
}
offset += fill_size;
}
}
else {
/* Build a buffer full of fill objects and output it as
* often as necessary. This saves on the overhead of potentially
* lots of bfd_set_section_contents calls.
*/
int n_per_buf, bytes, i;
if (fill_size == 1)
{
n_per_buf = sizeof (buf);
memset (buf, *fill_literal, n_per_buf);
}
else
{
char *bufp;
n_per_buf = sizeof(buf)/fill_size;
for (i = n_per_buf, bufp = buf; i; i--, bufp += fill_size)
memcpy(bufp, fill_literal, fill_size);
}
for (; count > 0; count -= n_per_buf)
{
n_per_buf = n_per_buf > count ? count : n_per_buf;
x = bfd_set_section_contents (stdoutput, sec,
buf, (file_ptr) offset,
(bfd_size_type) n_per_buf * fill_size);
assert (x == true);
offset += n_per_buf * fill_size;
}
}
}
#else
while (count--)
{
x = bfd_set_section_contents (stdoutput, sec,
fill_literal, (file_ptr) offset,
(bfd_size_type) fill_size);
assert (x == true);
offset += fill_size;
}
#endif
}
}
#endif
#if defined(BFD_ASSEMBLER) || (!defined (BFD) && !defined(OBJ_AOUT))
static void
merge_data_into_text ()
{
#if defined(BFD_ASSEMBLER) || defined(MANY_SEGMENTS)
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 /* BFD_ASSEMBLER || (! BFD && ! OBJ_AOUT) */
#if !defined (BFD_ASSEMBLER) && !defined (BFD)
static void
relax_and_size_all_segments ()
{
fragS *fragP;
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));
#endif /* ! OBJ_BOUT */
/* 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 */
}
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 && ! BFD */
#if defined (BFD_ASSEMBLER) || !defined (BFD)
#ifdef BFD_ASSEMBLER
static void
set_symtab ()
{
int nsyms;
asymbol **asympp;
symbolS *symp;
boolean result;
extern PTR bfd_alloc PARAMS ((bfd *, size_t));
/* Count symbols. We can't rely on a count made by the loop in
write_object_file, because *_frob_file may add a new symbol or
two. */
nsyms = 0;
for (symp = symbol_rootP; symp; symp = symbol_next (symp))
nsyms++;
if (nsyms)
{
int i;
asympp = (asymbol **) bfd_alloc (stdoutput,
nsyms * sizeof (asymbol *));
symp = symbol_rootP;
for (i = 0; i < nsyms; i++, symp = symbol_next (symp))
{
asympp[i] = symp->bsym;
symp->written = 1;
}
}
else
asympp = 0;
result = bfd_set_symtab (stdoutput, asympp, nsyms);
assert (result == true);
symbol_table_frozen = 1;
}
#endif
void
write_object_file ()
{
struct frchain *frchainP; /* Track along all frchains. */
#if ! defined (BFD_ASSEMBLER) || ! defined (WORKING_DOT_WORD)
fragS *fragP; /* Track along all frags. */
#endif
/* 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 (flag_always_generate_output)
{
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)
{
subseg_set (frchainP->frch_seg, frchainP->frch_subseg);
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);
}
/* 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 == reg_section || sec == expr_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 (flag_readonly_data_in_text)
{
merge_data_into_text ();
}
#endif
#ifdef BFD_ASSEMBLER
bfd_map_over_sections (stdoutput, relax_and_size_seg, (char *) 0);
#else
relax_and_size_all_segments ();
#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)
{
expressionS exp;
exp.X_op = O_subtract;
exp.X_add_symbol = lie->add;
exp.X_op_symbol = lie->sub;
exp.X_add_number = lie->addnum;
#ifdef BFD_ASSEMBLER
#ifdef TC_CONS_FIX_NEW
TC_CONS_FIX_NEW (lie->frag,
lie->word_goes_here - lie->frag->fr_literal,
2, &exp);
#else
fix_new_exp (lie->frag,
lie->word_goes_here - lie->frag->fr_literal,
2, &exp, 0, BFD_RELOC_NONE);
#endif
#else
#if defined(TC_SPARC) || defined(TC_A29K) || defined(NEED_FX_R_TYPE)
fix_new_exp (lie->frag,
lie->word_goes_here - lie->frag->fr_literal,
2, &exp, 0, NO_RELOC);
#else
#ifdef TC_NS32K
fix_new_ns32k_exp (lie->frag,
lie->word_goes_here - lie->frag->fr_literal,
2, &exp, 0, 0, 2, 0, 0);
#else
fix_new_exp (lie->frag,
lie->word_goes_here - lie->frag->fr_literal,
2, &exp, 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;
addressT table_addr;
addressT 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);
#ifdef BFD_ASSEMBLER
to_addr -= lie->sub->sy_frag->fr_address;
#endif
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;
#ifdef BFD_ASSEMBLER
to_addr += lie->add->sy_frag->fr_address;
#endif
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 */
long object_file_size;
/*
* 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
} /* 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 */
/* Resolve symbol values. This needs to be done before processing
the relocations. */
if (symbol_rootP)
{
symbolS *symp;
for (symp = symbol_rootP; symp; symp = symbol_next (symp))
if (!symp->sy_resolved)
resolve_symbol_value (symp);
}
bfd_map_over_sections (stdoutput, adjust_reloc_syms, (char *)0);
/* Set up symbol table, and write it out. */
if (symbol_rootP)
{
symbolS *symp;
for (symp = symbol_rootP; symp; symp = symbol_next (symp))
{
int punt = 0;
/* Do it again, because adjust_reloc_syms might introduce
more symbols. They'll probably only be section symbols,
but they'll still need to have the values computed. */
if (! symp->sy_resolved)
{
if (symp->sy_value.X_op == O_constant)
{
/* This is the normal case; skip the call. */
S_SET_VALUE (symp,
(S_GET_VALUE (symp)
+ symp->sy_frag->fr_address));
symp->sy_resolved = 1;
}
else
resolve_symbol_value (symp);
}
/* 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_ptr);
#if 0
printf ("symbol `%s'\n\t@%x: value=%d flags=%x seg=%s\n",
S_GET_NAME (symp), symp,
S_GET_VALUE (symp),
symp->bsym->flags,
segment_name (symp->bsym->section));
#endif
#ifdef obj_frob_symbol
obj_frob_symbol (symp, punt);
#endif
#ifdef tc_frob_symbol
if (! punt || symp->sy_used_in_reloc)
tc_frob_symbol (symp, punt);
#endif
/* If we don't want to keep this symbol, splice it out of
the chain now. If EMIT_SECTION_SYMBOLS is 0, we never
want section symbols. Otherwise, we skip local symbols
and symbols that the frob_symbol macros told us to punt,
but we keep such symbols if they are used in relocs. */
if ((! EMIT_SECTION_SYMBOLS
&& (symp->bsym->flags & BSF_SECTION_SYM) != 0)
/* Note that S_IS_EXTERN and S_IS_LOCAL are not always
opposites. Sometimes the former checks flags and the
latter examines the name... */
|| (!S_IS_EXTERN (symp)
&& (S_IS_LOCAL (symp) || punt)
&& ! symp->sy_used_in_reloc))
{
symbol_remove (symp, &symbol_rootP, &symbol_lastP);
/* After symbol_remove, symbol_next(symp) still returns
the one that came after it in the chain. So we don't
need to do any extra cleanup work here. */
continue;
}
/* Make sure we really got a value for the symbol. */
if (! symp->sy_resolved)
{
as_bad ("can't resolve value for symbol \"%s\"",
S_GET_NAME (symp));
symp->sy_resolved = 1;
}
/* Set the value into the BFD symbol. Up til now the value
has only been kept in the gas symbolS struct. */
symp->bsym->value = S_GET_VALUE (symp);
}
}
/* Now do any format-specific adjustments to the symbol table, such
as adding file symbols. */
#ifdef obj_adjust_symtab
obj_adjust_symtab ();
#endif
/* Now that all the sizes are known, and contents correct, we can
start writing to the file. */
set_symtab ();
/* If *_frob_file changes the symbol value at this point, it is
responsible for moving the changed value into symp->bsym->value
as well. Hopefully all symbol value changing can be done in
*_frob_symbol. */
#ifdef tc_frob_file
tc_frob_file ();
#endif
#ifdef obj_frob_file
obj_frob_file ();
#endif
bfd_map_over_sections (stdoutput, write_relocs, (char *) 0);
bfd_map_over_sections (stdoutput, write_contents, (char *) 0);
#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.
*/
#ifndef md_relax_frag
/* Subroutines of relax_segment. */
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;
}
#endif /* ! defined (md_relax_frag) */
/* Relax_align. Advance location counter to next address that has 'alignment'
lowest order bits all 0s, return size of adjustment made. */
static relax_addressT
relax_align (address, alignment)
register relax_addressT address; /* Address now. */
register int 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:
{
int offset = relax_align (address, (int) fragP->fr_offset);
if (offset % fragP->fr_var != 0)
{
as_bad ("alignment padding (%d bytes) not a multiple of %ld",
offset, (long) fragP->fr_var);
offset -= (offset % fragP->fr_var);
}
address += 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;
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 (flag_warn_displacement)
{
char buf[50];
sprint_value (buf, (addressT) lie->addnum);
as_warn (".word %s-%s+%s didn't fit",
S_GET_NAME (lie->add),
S_GET_NAME (lie->sub),
buf);
}
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),
(int) offset)
- relax_align ((relax_addressT) (was_address
+ fragP->fr_fix),
(int) 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:
#ifdef md_relax_frag
growth = md_relax_frag (fragP, stretch);
#else
/* The default way to relax a frag is to look through
md_relax_table. */
{
const relax_typeS *this_type;
const relax_typeS *start_type;
relax_substateT next_state;
relax_substateT this_state;
long aim;
this_state = fragP->fr_subtype;
start_type = this_type = md_relax_table + this_state;
target = offset;
if (symbolP)
{
#ifndef DIFF_EXPR_OK
#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);
#endif
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;
#ifdef TC_PCREL_ADJUST
/* Currently only the ns32k family needs this */
aim += TC_PCREL_ADJUST(fragP);
#else
/* This machine doesn't want to use pcrel_adjust.
In that case, pcrel_adjust should be zero. */
assert (fragP->fr_pcrel_adjust == 0);
#endif
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;
}
#endif
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() */
#if defined (BFD_ASSEMBLER) || !defined (BFD)
#ifndef TC_RELOC_RTSYM_LOC_FIXUP
#define TC_RELOC_RTSYM_LOC_FIXUP(X) (1)
#endif
/* 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. */
{
long seg_reloc_count = 0;
symbolS *add_symbolP;
symbolS *sub_symbolP;
valueT add_number;
int size;
char *place;
long where;
char pcrel;
fragS *fragP;
segT add_symbol_segment = absolute_section;
/* If the linker is doing the relaxing, we must not do any fixups.
Well, strictly speaking that's not true -- we could do any that are
PC-relative and don't cross regions that could change size. And for the
i960 (the only machine for which we've got a relaxing linker right now),
we might be able to turn callx/callj into bal anyways in cases where we
know the maximum displacement. */
if (linkrelax)
{
for (; fixP; fixP = fixP->fx_next)
seg_reloc_count++;
TC_ADJUST_RELOC_COUNT (fixP, seg_reloc_count);
return seg_reloc_count;
}
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_VALIDATE_FIX
TC_VALIDATE_FIX (fixP, this_segment_type, skip);
#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)
add_number -= S_GET_VALUE (sub_symbolP);
else if (pcrel
&& S_GET_SEGMENT (sub_symbolP) == this_segment_type)
{
/* Should try converting to a constant. */
goto bad_sub_reloc;
}
else
bad_sub_reloc:
as_bad_where (fixP->fx_file, fixP->fx_line,
"Negative of non-absolute symbol %s",
S_GET_NAME (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_tcbit)
as_bad_where (fixP->fx_file, fixP->fx_line,
"callj to difference of 2 symbols");
#endif /* TC_I960 */
add_number += S_GET_VALUE (add_symbolP) -
S_GET_VALUE (sub_symbolP);
add_symbolP = NULL;
/* Let the target machine make the final determination
as to whether or not a relocation will be needed to
handle this fixup. */
if (!TC_FORCE_RELOCATION (fixP))
{
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);
#ifdef DIFF_EXPR_OK
else if (S_GET_SEGMENT (sub_symbolP) == this_segment_type
#if 0 /* Do this even if it's already described as pc-relative. For example,
on the m68k, an operand of "pc@(foo-.-2)" should address "foo" in a
pc-relative mode. */
&& pcrel
#endif
)
{
/* Make it pc-relative. */
add_number += (md_pcrel_from (fixP)
- S_GET_VALUE (sub_symbolP));
pcrel = 1;
fixP->fx_pcrel = 1;
sub_symbolP = 0;
fixP->fx_subsy = 0;
}
#endif
#ifdef BFD_ASSEMBLER
else if (fixP->fx_r_type == BFD_RELOC_GPREL32
|| fixP->fx_r_type == BFD_RELOC_GPREL16)
{
/* Leave it alone. */
}
#endif
else
{
char buf[50];
sprint_value (buf, fragP->fr_address + where);
as_bad_where (fixP->fx_file, fixP->fx_line,
"Can't emit reloc {- %s-seg symbol \"%s\"} @ file address %s.",
segment_name (S_GET_SEGMENT (sub_symbolP)),
S_GET_NAME (sub_symbolP), buf);
}
}
}
if (add_symbolP)
{
if (add_symbol_segment == this_segment_type && pcrel
&& TC_RELOC_RTSYM_LOC_FIXUP (fixP->fx_r_type))
{
/*
* 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. */
/* Let the target machine make the final determination
as to whether or not a relocation will be needed to
handle this fixup. */
if (!TC_FORCE_RELOCATION (fixP))
{
fixP->fx_pcrel = 0;
fixP->fx_addsy = NULL;
}
}
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);
/* Let the target machine make the final determination
as to whether or not a relocation will be needed to
handle this fixup. */
if (!TC_FORCE_RELOCATION (fixP))
{
fixP->fx_addsy = NULL;
add_symbolP = NULL;
}
}
else if (add_symbol_segment == undefined_section
#ifdef BFD_ASSEMBLER
|| bfd_is_com_section (add_symbol_segment)
#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_where (fixP->fx_file, fixP->fx_line,
"can't use COBR format with external label");
fixP->fx_addsy = NULL;
fixP->fx_done = 1;
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 (pcrel)
{
add_number -= md_pcrel_from (fixP);
if (add_symbolP == 0)
{
#ifndef BFD_ASSEMBLER
fixP->fx_addsy = &abs_symbol;
#else
fixP->fx_addsy = section_symbol (absolute_section);
#endif
fixP->fx_addsy->sy_used_in_reloc = 1;
++seg_reloc_count;
}
}
if (!fixP->fx_bit_fixP && size > 0)
{
valueT mask = 0;
if (size < sizeof (mask))
{
/* set all bits to one */
mask--;
/* Technically, combining these produces an undefined result
if size is sizeof (valueT), though I think these two
half-way operations should both be defined. And the
compiler should be able to combine them if it's valid on
the host architecture. */
mask <<= size * 4;
mask <<= size * 4;
if ((add_number & mask) != 0
&& (add_number & mask) != mask)
{
char buf[50], buf2[50];
sprint_value (buf, fragP->fr_address + where);
if (add_number > 1000)
sprint_value (buf2, add_number);
else
sprintf (buf2, "%ld", (long) add_number);
as_bad_where (fixP->fx_file, fixP->fx_line,
"Value of %s too large for field of %d bytes at %s",
buf2, size, buf);
} /* 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 (!flag_signed_overflow_ok
&& size == 2
&& add_number > 0x7fff)
as_bad_where (fixP->fx_file, fixP->fx_line,
"Signed .word overflow; switch may be too large; %ld at 0x%lx",
(long) add_number,
(unsigned long) (fragP->fr_address + where));
#endif
} /* not a bit fix */
if (!fixP->fx_done)
{
#ifdef BFD_ASSEMBLER
md_apply_fix (fixP, &add_number);
#else
md_apply_fix (fixP, add_number);
#endif
#ifndef TC_HANDLES_FX_DONE
/* If the tc-* files haven't been converted, assume it's handling
it the old way, where a null fx_addsy means that the fix has
been applied completely, and no further work is needed. */
if (fixP->fx_addsy == 0 && fixP->fx_pcrel == 0)
fixP->fx_done = 1;
#endif
}
#ifdef TC_VALIDATE_FIX
skip:
#endif
;
} /* For each fixS in this segment. */
TC_ADJUST_RELOC_COUNT (fixP, seg_reloc_count);
return seg_reloc_count;
}
#endif /* defined (BFD_ASSEMBLER) || !defined (BFD) */
void
number_to_chars_bigendian (buf, val, n)
char *buf;
valueT val;
int n;
{
if (n > sizeof (val)|| n <= 0)
abort ();
while (n--)
{
buf[n] = val & 0xff;
val >>= 8;
}
}
void
number_to_chars_littleendian (buf, val, n)
char *buf;
valueT val;
int n;
{
if (n > sizeof (val) || n <= 0)
abort ();
while (n--)
{
*buf++ = val & 0xff;
val >>= 8;
}
}
/* for debugging */
extern int indent_level;
void
print_fixup (fixp)
fixS *fixp;
{
indent_level = 1;
fprintf (stderr, "fix");
if (fixp->fx_pcrel)
fprintf (stderr, " pcrel");
if (fixp->fx_pcrel_adjust)
fprintf (stderr, " pcrel_adjust=%d", fixp->fx_pcrel_adjust);
if (fixp->fx_im_disp)
{
#ifdef TC_NS32K
fprintf (stderr, " im_disp=%d", fixp->fx_im_disp);
#else
fprintf (stderr, " im_disp");
#endif
}
if (fixp->fx_tcbit)
fprintf (stderr, " tcbit");
if (fixp->fx_done)
fprintf (stderr, " done");
fprintf (stderr, "\n %s:%d", fixp->fx_file, fixp->fx_line);
fprintf (stderr, "\n size=%d frag=%lx where=%ld addnumber=%lx",
fixp->fx_size, (long) fixp->fx_frag, fixp->fx_where,
(long) fixp->fx_addnumber);
}
/* end of write.c */
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