658 lines
16 KiB
C
658 lines
16 KiB
C
/* subsegs.c - subsegments -
|
||
Copyright 1987, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998,
|
||
1999, 2000, 2002
|
||
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, 59 Temple Place - Suite 330, Boston, MA
|
||
02111-1307, USA. */
|
||
|
||
/* Segments & sub-segments. */
|
||
|
||
#include "as.h"
|
||
|
||
#include "subsegs.h"
|
||
#include "obstack.h"
|
||
|
||
frchainS *frchain_root, *frchain_now;
|
||
|
||
static struct obstack frchains;
|
||
|
||
#ifndef BFD_ASSEMBLER
|
||
#ifdef MANY_SEGMENTS
|
||
segment_info_type segment_info[SEG_MAXIMUM_ORDINAL];
|
||
|
||
#else
|
||
/* Commented in "subsegs.h". */
|
||
frchainS *data0_frchainP, *bss0_frchainP;
|
||
|
||
#endif /* MANY_SEGMENTS */
|
||
char const *const seg_name[] = {
|
||
"absolute",
|
||
#ifdef MANY_SEGMENTS
|
||
"e0", "e1", "e2", "e3", "e4", "e5", "e6", "e7", "e8", "e9",
|
||
"e10", "e11", "e12", "e13", "e14", "e15", "e16", "e17", "e18", "e19",
|
||
"e20", "e21", "e22", "e23", "e24", "e25", "e26", "e27", "e28", "e29",
|
||
"e30", "e31", "e32", "e33", "e34", "e35", "e36", "e37", "e38", "e39",
|
||
#else
|
||
"text",
|
||
"data",
|
||
"bss",
|
||
#endif /* MANY_SEGMENTS */
|
||
"unknown",
|
||
"ASSEMBLER-INTERNAL-LOGIC-ERROR!",
|
||
"expr",
|
||
"debug",
|
||
"transfert vector preload",
|
||
"transfert vector postload",
|
||
"register",
|
||
"",
|
||
}; /* Used by error reporters, dumpers etc. */
|
||
#else /* BFD_ASSEMBLER */
|
||
|
||
/* Gas segment information for bfd_abs_section_ptr and
|
||
bfd_und_section_ptr. */
|
||
static segment_info_type *abs_seg_info;
|
||
static segment_info_type *und_seg_info;
|
||
|
||
#endif /* BFD_ASSEMBLER */
|
||
|
||
static void subseg_set_rest PARAMS ((segT, subsegT));
|
||
|
||
static fragS dummy_frag;
|
||
|
||
static frchainS absolute_frchain;
|
||
|
||
void
|
||
subsegs_begin ()
|
||
{
|
||
/* Check table(s) seg_name[], seg_N_TYPE[] is in correct order */
|
||
#if !defined (MANY_SEGMENTS) && !defined (BFD_ASSEMBLER)
|
||
know (SEG_ABSOLUTE == 0);
|
||
know (SEG_TEXT == 1);
|
||
know (SEG_DATA == 2);
|
||
know (SEG_BSS == 3);
|
||
know (SEG_UNKNOWN == 4);
|
||
know (SEG_GOOF == 5);
|
||
know (SEG_EXPR == 6);
|
||
know (SEG_DEBUG == 7);
|
||
know (SEG_NTV == 8);
|
||
know (SEG_PTV == 9);
|
||
know (SEG_REGISTER == 10);
|
||
know (SEG_MAXIMUM_ORDINAL == SEG_REGISTER);
|
||
#endif
|
||
|
||
obstack_begin (&frchains, chunksize);
|
||
#if __GNUC__ >= 2
|
||
obstack_alignment_mask (&frchains) = __alignof__ (frchainS) - 1;
|
||
#endif
|
||
|
||
frchain_root = NULL;
|
||
frchain_now = NULL; /* Warn new_subseg() that we are booting. */
|
||
|
||
frag_now = &dummy_frag;
|
||
|
||
#ifndef BFD_ASSEMBLER
|
||
now_subseg = 42; /* Lie for 1st call to subseg_new. */
|
||
#ifdef MANY_SEGMENTS
|
||
{
|
||
int i;
|
||
for (i = SEG_E0; i < SEG_UNKNOWN; i++)
|
||
{
|
||
subseg_set (i, 0);
|
||
segment_info[i].frchainP = frchain_now;
|
||
}
|
||
}
|
||
#else
|
||
subseg_set (SEG_DATA, 0); /* .data 0 */
|
||
data0_frchainP = frchain_now;
|
||
|
||
subseg_set (SEG_BSS, 0);
|
||
bss0_frchainP = frchain_now;
|
||
|
||
#endif /* ! MANY_SEGMENTS */
|
||
#endif /* ! BFD_ASSEMBLER */
|
||
|
||
absolute_frchain.frch_seg = absolute_section;
|
||
absolute_frchain.frch_subseg = 0;
|
||
#ifdef BFD_ASSEMBLER
|
||
absolute_frchain.fix_root = absolute_frchain.fix_tail = 0;
|
||
#endif
|
||
absolute_frchain.frch_frag_now = &zero_address_frag;
|
||
absolute_frchain.frch_root = absolute_frchain.frch_last = &zero_address_frag;
|
||
}
|
||
|
||
/*
|
||
* subseg_change()
|
||
*
|
||
* Change the subsegment we are in, BUT DO NOT MAKE A NEW FRAG for the
|
||
* subsegment. If we are already in the correct subsegment, change nothing.
|
||
* This is used eg as a worker for subseg_set [which does make a new frag_now]
|
||
* and for changing segments after we have read the source. We construct eg
|
||
* fixSs even after the source file is read, so we do have to keep the
|
||
* segment context correct.
|
||
*/
|
||
void
|
||
subseg_change (seg, subseg)
|
||
register segT seg;
|
||
register int subseg;
|
||
{
|
||
now_seg = seg;
|
||
now_subseg = subseg;
|
||
|
||
if (now_seg == absolute_section)
|
||
return;
|
||
|
||
#ifdef BFD_ASSEMBLER
|
||
{
|
||
segment_info_type *seginfo;
|
||
seginfo = (segment_info_type *) bfd_get_section_userdata (stdoutput, seg);
|
||
if (! seginfo)
|
||
{
|
||
seginfo = (segment_info_type *) xmalloc (sizeof (*seginfo));
|
||
memset ((PTR) seginfo, 0, sizeof (*seginfo));
|
||
seginfo->fix_root = NULL;
|
||
seginfo->fix_tail = NULL;
|
||
seginfo->bfd_section = seg;
|
||
seginfo->sym = 0;
|
||
if (seg == bfd_abs_section_ptr)
|
||
abs_seg_info = seginfo;
|
||
else if (seg == bfd_und_section_ptr)
|
||
und_seg_info = seginfo;
|
||
else
|
||
bfd_set_section_userdata (stdoutput, seg, (PTR) seginfo);
|
||
}
|
||
}
|
||
#else
|
||
#ifdef MANY_SEGMENTS
|
||
seg_fix_rootP = &segment_info[seg].fix_root;
|
||
seg_fix_tailP = &segment_info[seg].fix_tail;
|
||
#else
|
||
if (seg == SEG_DATA)
|
||
{
|
||
seg_fix_rootP = &data_fix_root;
|
||
seg_fix_tailP = &data_fix_tail;
|
||
}
|
||
else if (seg == SEG_TEXT)
|
||
{
|
||
seg_fix_rootP = &text_fix_root;
|
||
seg_fix_tailP = &text_fix_tail;
|
||
}
|
||
else
|
||
{
|
||
know (seg == SEG_BSS);
|
||
seg_fix_rootP = &bss_fix_root;
|
||
seg_fix_tailP = &bss_fix_tail;
|
||
}
|
||
|
||
#endif
|
||
#endif
|
||
}
|
||
|
||
static void
|
||
subseg_set_rest (seg, subseg)
|
||
segT seg;
|
||
subsegT subseg;
|
||
{
|
||
register frchainS *frcP; /* crawl frchain chain */
|
||
register frchainS **lastPP; /* address of last pointer */
|
||
frchainS *newP; /* address of new frchain */
|
||
|
||
mri_common_symbol = NULL;
|
||
|
||
if (frag_now && frchain_now)
|
||
frchain_now->frch_frag_now = frag_now;
|
||
|
||
assert (frchain_now == 0
|
||
|| now_seg == undefined_section
|
||
|| now_seg == absolute_section
|
||
|| frchain_now->frch_last == frag_now);
|
||
|
||
subseg_change (seg, (int) subseg);
|
||
|
||
if (seg == absolute_section)
|
||
{
|
||
frchain_now = &absolute_frchain;
|
||
frag_now = &zero_address_frag;
|
||
return;
|
||
}
|
||
|
||
assert (frchain_now == 0
|
||
|| now_seg == undefined_section
|
||
|| frchain_now->frch_last == frag_now);
|
||
|
||
/*
|
||
* Attempt to find or make a frchain for that sub seg.
|
||
* Crawl along chain of frchainSs, begins @ frchain_root.
|
||
* If we need to make a frchainS, link it into correct
|
||
* position of chain rooted in frchain_root.
|
||
*/
|
||
for (frcP = *(lastPP = &frchain_root);
|
||
frcP && frcP->frch_seg <= seg;
|
||
frcP = *(lastPP = &frcP->frch_next))
|
||
{
|
||
if (frcP->frch_seg == seg
|
||
&& frcP->frch_subseg >= subseg)
|
||
{
|
||
break;
|
||
}
|
||
}
|
||
/*
|
||
* frcP: Address of the 1st frchainS in correct segment with
|
||
* frch_subseg >= subseg.
|
||
* We want to either use this frchainS, or we want
|
||
* to insert a new frchainS just before it.
|
||
*
|
||
* If frcP==NULL, then we are at the end of the chain
|
||
* of frchainS-s. A NULL frcP means we fell off the end
|
||
* of the chain looking for a
|
||
* frch_subseg >= subseg, so we
|
||
* must make a new frchainS.
|
||
*
|
||
* If we ever maintain a pointer to
|
||
* the last frchainS in the chain, we change that pointer
|
||
* ONLY when frcP==NULL.
|
||
*
|
||
* lastPP: Address of the pointer with value frcP;
|
||
* Never NULL.
|
||
* May point to frchain_root.
|
||
*
|
||
*/
|
||
if (!frcP
|
||
|| (frcP->frch_seg > seg
|
||
|| frcP->frch_subseg > subseg)) /* Kinky logic only works with 2 segments. */
|
||
{
|
||
/*
|
||
* This should be the only code that creates a frchainS.
|
||
*/
|
||
newP = (frchainS *) obstack_alloc (&frchains, sizeof (frchainS));
|
||
newP->frch_subseg = subseg;
|
||
newP->frch_seg = seg;
|
||
#ifdef BFD_ASSEMBLER
|
||
newP->fix_root = NULL;
|
||
newP->fix_tail = NULL;
|
||
#endif
|
||
obstack_begin (&newP->frch_obstack, chunksize);
|
||
#if __GNUC__ >= 2
|
||
obstack_alignment_mask (&newP->frch_obstack) = __alignof__ (fragS) - 1;
|
||
#endif
|
||
newP->frch_frag_now = frag_alloc (&newP->frch_obstack);
|
||
newP->frch_frag_now->fr_type = rs_fill;
|
||
|
||
newP->frch_root = newP->frch_last = newP->frch_frag_now;
|
||
|
||
*lastPP = newP;
|
||
newP->frch_next = frcP; /* perhaps NULL */
|
||
|
||
#ifdef BFD_ASSEMBLER
|
||
{
|
||
segment_info_type *seginfo;
|
||
seginfo = seg_info (seg);
|
||
if (seginfo && seginfo->frchainP == frcP)
|
||
seginfo->frchainP = newP;
|
||
}
|
||
#endif
|
||
|
||
frcP = newP;
|
||
}
|
||
/*
|
||
* Here with frcP pointing to the frchainS for subseg.
|
||
*/
|
||
frchain_now = frcP;
|
||
frag_now = frcP->frch_frag_now;
|
||
|
||
assert (frchain_now->frch_last == frag_now);
|
||
}
|
||
|
||
/*
|
||
* subseg_set(segT, subsegT)
|
||
*
|
||
* If you attempt to change to the current subsegment, nothing happens.
|
||
*
|
||
* In: segT, subsegT code for new subsegment.
|
||
* frag_now -> incomplete frag for current subsegment.
|
||
* If frag_now==NULL, then there is no old, incomplete frag, so
|
||
* the old frag is not closed off.
|
||
*
|
||
* Out: now_subseg, now_seg updated.
|
||
* Frchain_now points to the (possibly new) struct frchain for this
|
||
* sub-segment.
|
||
* Frchain_root updated if needed.
|
||
*/
|
||
|
||
#ifndef BFD_ASSEMBLER
|
||
|
||
segT
|
||
subseg_new (segname, subseg)
|
||
const char *segname;
|
||
subsegT subseg;
|
||
{
|
||
int i;
|
||
|
||
for (i = 0; i < (int) SEG_MAXIMUM_ORDINAL; i++)
|
||
{
|
||
const char *s;
|
||
|
||
s = segment_name ((segT) i);
|
||
if (strcmp (segname, s) == 0
|
||
|| (segname[0] == '.'
|
||
&& strcmp (segname + 1, s) == 0))
|
||
{
|
||
subseg_set ((segT) i, subseg);
|
||
return (segT) i;
|
||
}
|
||
#ifdef obj_segment_name
|
||
s = obj_segment_name ((segT) i);
|
||
if (strcmp (segname, s) == 0
|
||
|| (segname[0] == '.'
|
||
&& strcmp (segname + 1, s) == 0))
|
||
{
|
||
subseg_set ((segT) i, subseg);
|
||
return (segT) i;
|
||
}
|
||
#endif
|
||
}
|
||
|
||
#ifdef obj_add_segment
|
||
{
|
||
segT new_seg;
|
||
new_seg = obj_add_segment (segname);
|
||
subseg_set (new_seg, subseg);
|
||
return new_seg;
|
||
}
|
||
#else
|
||
as_bad (_("attempt to switch to nonexistent segment \"%s\""), segname);
|
||
return now_seg;
|
||
#endif
|
||
}
|
||
|
||
void
|
||
subseg_set (seg, subseg) /* begin assembly for a new sub-segment */
|
||
register segT seg; /* SEG_DATA or SEG_TEXT */
|
||
register subsegT subseg;
|
||
{
|
||
#ifndef MANY_SEGMENTS
|
||
know (seg == SEG_DATA
|
||
|| seg == SEG_TEXT
|
||
|| seg == SEG_BSS
|
||
|| seg == SEG_ABSOLUTE);
|
||
#endif
|
||
|
||
if (seg != now_seg || subseg != now_subseg)
|
||
{ /* we just changed sub-segments */
|
||
subseg_set_rest (seg, subseg);
|
||
}
|
||
mri_common_symbol = NULL;
|
||
}
|
||
|
||
#else /* BFD_ASSEMBLER */
|
||
|
||
segT
|
||
subseg_get (segname, force_new)
|
||
const char *segname;
|
||
int force_new;
|
||
{
|
||
segT secptr;
|
||
segment_info_type *seginfo;
|
||
const char *now_seg_name = (now_seg
|
||
? bfd_get_section_name (stdoutput, now_seg)
|
||
: 0);
|
||
|
||
if (!force_new
|
||
&& now_seg_name
|
||
&& (now_seg_name == segname
|
||
|| !strcmp (now_seg_name, segname)))
|
||
return now_seg;
|
||
|
||
if (!force_new)
|
||
secptr = bfd_make_section_old_way (stdoutput, segname);
|
||
else
|
||
secptr = bfd_make_section_anyway (stdoutput, segname);
|
||
|
||
seginfo = seg_info (secptr);
|
||
if (! seginfo)
|
||
{
|
||
/* Check whether output_section is set first because secptr may
|
||
be bfd_abs_section_ptr. */
|
||
if (secptr->output_section != secptr)
|
||
secptr->output_section = secptr;
|
||
seginfo = (segment_info_type *) xmalloc (sizeof (*seginfo));
|
||
memset ((PTR) seginfo, 0, sizeof (*seginfo));
|
||
seginfo->fix_root = NULL;
|
||
seginfo->fix_tail = NULL;
|
||
seginfo->bfd_section = secptr;
|
||
if (secptr == bfd_abs_section_ptr)
|
||
abs_seg_info = seginfo;
|
||
else if (secptr == bfd_und_section_ptr)
|
||
und_seg_info = seginfo;
|
||
else
|
||
bfd_set_section_userdata (stdoutput, secptr, (PTR) seginfo);
|
||
seginfo->frchainP = NULL;
|
||
seginfo->lineno_list_head = seginfo->lineno_list_tail = NULL;
|
||
seginfo->sym = NULL;
|
||
seginfo->dot = NULL;
|
||
}
|
||
return secptr;
|
||
}
|
||
|
||
segT
|
||
subseg_new (segname, subseg)
|
||
const char *segname;
|
||
subsegT subseg;
|
||
{
|
||
segT secptr;
|
||
segment_info_type *seginfo;
|
||
|
||
secptr = subseg_get (segname, 0);
|
||
subseg_set_rest (secptr, subseg);
|
||
seginfo = seg_info (secptr);
|
||
if (! seginfo->frchainP)
|
||
seginfo->frchainP = frchain_now;
|
||
return secptr;
|
||
}
|
||
|
||
/* Like subseg_new, except a new section is always created, even if
|
||
a section with that name already exists. */
|
||
segT
|
||
subseg_force_new (segname, subseg)
|
||
const char *segname;
|
||
subsegT subseg;
|
||
{
|
||
segT secptr;
|
||
segment_info_type *seginfo;
|
||
|
||
secptr = subseg_get (segname, 1);
|
||
subseg_set_rest (secptr, subseg);
|
||
seginfo = seg_info (secptr);
|
||
if (! seginfo->frchainP)
|
||
seginfo->frchainP = frchain_now;
|
||
return secptr;
|
||
}
|
||
|
||
void
|
||
subseg_set (secptr, subseg)
|
||
segT secptr;
|
||
subsegT subseg;
|
||
{
|
||
if (! (secptr == now_seg && subseg == now_subseg))
|
||
subseg_set_rest (secptr, subseg);
|
||
mri_common_symbol = NULL;
|
||
}
|
||
|
||
#ifndef obj_sec_sym_ok_for_reloc
|
||
#define obj_sec_sym_ok_for_reloc(SEC) 0
|
||
#endif
|
||
|
||
/* Get the gas information we are storing for a section. */
|
||
|
||
segment_info_type *
|
||
seg_info (sec)
|
||
segT sec;
|
||
{
|
||
if (sec == bfd_abs_section_ptr)
|
||
return abs_seg_info;
|
||
else if (sec == bfd_und_section_ptr)
|
||
return und_seg_info;
|
||
else
|
||
return (segment_info_type *) bfd_get_section_userdata (stdoutput, sec);
|
||
}
|
||
|
||
symbolS *
|
||
section_symbol (sec)
|
||
segT sec;
|
||
{
|
||
segment_info_type *seginfo = seg_info (sec);
|
||
symbolS *s;
|
||
|
||
if (seginfo == 0)
|
||
abort ();
|
||
if (seginfo->sym)
|
||
return seginfo->sym;
|
||
|
||
#ifndef EMIT_SECTION_SYMBOLS
|
||
#define EMIT_SECTION_SYMBOLS 1
|
||
#endif
|
||
|
||
if (! EMIT_SECTION_SYMBOLS || symbol_table_frozen)
|
||
{
|
||
/* Here we know it won't be going into the symbol table. */
|
||
s = symbol_create (sec->name, sec, 0, &zero_address_frag);
|
||
}
|
||
else
|
||
{
|
||
s = symbol_find_base (sec->name, 0);
|
||
if (s == NULL)
|
||
s = symbol_new (sec->name, sec, 0, &zero_address_frag);
|
||
else
|
||
{
|
||
if (S_GET_SEGMENT (s) == undefined_section)
|
||
{
|
||
S_SET_SEGMENT (s, sec);
|
||
symbol_set_frag (s, &zero_address_frag);
|
||
}
|
||
}
|
||
}
|
||
|
||
S_CLEAR_EXTERNAL (s);
|
||
|
||
/* Use the BFD section symbol, if possible. */
|
||
if (obj_sec_sym_ok_for_reloc (sec))
|
||
symbol_set_bfdsym (s, sec->symbol);
|
||
else
|
||
symbol_get_bfdsym (s)->flags |= BSF_SECTION_SYM;
|
||
|
||
seginfo->sym = s;
|
||
return s;
|
||
}
|
||
|
||
#endif /* BFD_ASSEMBLER */
|
||
|
||
/* Return whether the specified segment is thought to hold text. */
|
||
|
||
#ifndef BFD_ASSEMBLER
|
||
const char * const nontext_section_names[] = {
|
||
".eh_frame",
|
||
".gcc_except_table",
|
||
#ifdef OBJ_COFF
|
||
#ifndef COFF_LONG_SECTION_NAMES
|
||
".eh_fram",
|
||
".gcc_exc",
|
||
#endif
|
||
#endif
|
||
NULL
|
||
};
|
||
#endif /* ! BFD_ASSEMBLER */
|
||
|
||
int
|
||
subseg_text_p (sec)
|
||
segT sec;
|
||
{
|
||
#ifdef BFD_ASSEMBLER
|
||
return (bfd_get_section_flags (stdoutput, sec) & SEC_CODE) != 0;
|
||
#else /* ! BFD_ASSEMBLER */
|
||
const char * const *p;
|
||
|
||
if (sec == data_section || sec == bss_section || sec == absolute_section)
|
||
return 0;
|
||
|
||
for (p = nontext_section_names; *p != NULL; ++p)
|
||
{
|
||
if (strcmp (segment_name (sec), *p) == 0)
|
||
return 0;
|
||
|
||
#ifdef obj_segment_name
|
||
if (strcmp (obj_segment_name (sec), *p) == 0)
|
||
return 0;
|
||
#endif
|
||
}
|
||
|
||
return 1;
|
||
|
||
#endif /* ! BFD_ASSEMBLER */
|
||
}
|
||
|
||
void
|
||
subsegs_print_statistics (file)
|
||
FILE *file;
|
||
{
|
||
frchainS *frchp;
|
||
fprintf (file, "frag chains:\n");
|
||
for (frchp = frchain_root; frchp; frchp = frchp->frch_next)
|
||
{
|
||
int count = 0;
|
||
fragS *fragp;
|
||
|
||
/* If frch_subseg is non-zero, it's probably been chained onto
|
||
the end of a previous subsection. Don't count it again. */
|
||
if (frchp->frch_subseg != 0)
|
||
continue;
|
||
|
||
/* Skip gas-internal sections. */
|
||
if (segment_name (frchp->frch_seg)[0] == '*')
|
||
continue;
|
||
|
||
for (fragp = frchp->frch_root; fragp; fragp = fragp->fr_next)
|
||
{
|
||
#if 0
|
||
switch (fragp->fr_type)
|
||
{
|
||
case rs_fill:
|
||
fprintf (file, "f"); break;
|
||
case rs_align:
|
||
fprintf (file, "a"); break;
|
||
case rs_align_code:
|
||
fprintf (file, "c"); break;
|
||
case rs_org:
|
||
fprintf (file, "o"); break;
|
||
case rs_machine_dependent:
|
||
fprintf (file, "m"); break;
|
||
case rs_space:
|
||
fprintf (file, "s"); break;
|
||
case 0:
|
||
fprintf (file, "0"); break;
|
||
default:
|
||
fprintf (file, "?"); break;
|
||
}
|
||
#endif
|
||
count++;
|
||
}
|
||
fprintf (file, "\n");
|
||
fprintf (file, "\t%p %-10s\t%10d frags\n", (void *) frchp,
|
||
segment_name (frchp->frch_seg), count);
|
||
}
|
||
}
|
||
|
||
/* end of subsegs.c */
|