mirror of
https://sourceware.org/git/binutils-gdb.git
synced 2024-12-15 04:31:49 +08:00
604633aeca
Wrote non-BFD_ASSEMBLER subseg_new. Now subseg_new always takes a section name, and subseg_set always takes a segT. Changed all callers as appropriate. * config/obj-coffbfd.c (change_to_section): Renamed to obj_coff_add_segment. Corrected. Made callers use subseg_new. * config/obj-coffbfd.h (obj_segment_name, obj_add_segment): Define. Also some more gcc warning removal.
428 lines
11 KiB
C
428 lines
11 KiB
C
/* subsegs.c - subsegments -
|
||
Copyright (C) 1987, 1990, 1991, 1992 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. */
|
||
|
||
/*
|
||
* Segments & sub-segments.
|
||
*/
|
||
|
||
#include "as.h"
|
||
|
||
#include "subsegs.h"
|
||
#include "obstack.h"
|
||
|
||
frchainS *frchain_root, *frchain_now;
|
||
|
||
#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 seg_name[] =
|
||
{
|
||
"absolute",
|
||
#ifdef MANY_SEGMENTS
|
||
"e0", "e1", "e2", "e3", "e4", "e5", "e6", "e7", "e8", "e9",
|
||
#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. */
|
||
#endif /* BFD_ASSEMBLER */
|
||
|
||
static void subseg_set_rest PARAMS ((segT, subsegT));
|
||
|
||
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 (&frags, 5000);
|
||
frchain_root = NULL;
|
||
frchain_now = NULL; /* Warn new_subseg() that we are booting. */
|
||
/* Fake up 1st frag. It won't be used=> is ok if obstack...
|
||
pads the end of it for alignment. */
|
||
frag_now = (fragS *) obstack_alloc (&frags, SIZEOF_STRUCT_FRAG);
|
||
memset (frag_now, SIZEOF_STRUCT_FRAG, 0);
|
||
|
||
#ifndef BFD_ASSEMBLER
|
||
/* This 1st frag will not be in any frchain.
|
||
We simply give subseg_new somewhere to scribble. */
|
||
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 */
|
||
|
||
}
|
||
|
||
/*
|
||
* 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;
|
||
|
||
#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));
|
||
if (! seginfo)
|
||
abort ();
|
||
seginfo->fix_root = 0;
|
||
seginfo->fix_tail = 0;
|
||
seginfo->bfd_section = seg;
|
||
seginfo->sym = 0;
|
||
bfd_set_section_userdata (stdoutput, seg, (char *) 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;
|
||
{
|
||
long tmp; /* JF for obstack alignment hacking */
|
||
register frchainS *frcP; /* crawl frchain chain */
|
||
register frchainS **lastPP; /* address of last pointer */
|
||
frchainS *newP; /* address of new frchain */
|
||
register fragS *former_last_fragP;
|
||
register fragS *new_fragP;
|
||
|
||
if (frag_now) /* If not bootstrapping. */
|
||
{
|
||
frag_now->fr_fix = (char*) obstack_next_free (&frags) - frag_now->fr_literal;
|
||
frag_wane (frag_now); /* Close off any frag in old subseg. */
|
||
}
|
||
/*
|
||
* It would be nice to keep an obstack for each subsegment, if we swap
|
||
* subsegments a lot. Hence we would have much fewer frag_wanes().
|
||
*/
|
||
{
|
||
obstack_finish (&frags);
|
||
/*
|
||
* If we don't do the above, the next object we put on obstack frags
|
||
* will appear to start at the fr_literal of the current frag.
|
||
* Also, above ensures that the next object will begin on a
|
||
* address that is aligned correctly for the engine that runs
|
||
* this program.
|
||
*/
|
||
}
|
||
subseg_change (seg, (int) subseg);
|
||
/*
|
||
* 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 && (int) (frcP->frch_seg) <= (int) seg;
|
||
frcP = *(lastPP = &frcP->frch_next))
|
||
{
|
||
if ((int) (frcP->frch_seg) == (int) 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
|
||
|| ((int) (frcP->frch_seg) > (int) 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 (&frags, sizeof (frchainS));
|
||
memset (newP, sizeof (frchainS), 0);
|
||
/* This begines on a good boundary because a obstack_done()
|
||
preceeded it. It implies an obstack_done(), so we expect
|
||
the next object allocated to begin on a correct boundary. */
|
||
*lastPP = newP;
|
||
newP->frch_next = frcP; /* perhaps NULL */
|
||
(frcP = newP)->frch_subseg = subseg;
|
||
newP->frch_seg = seg;
|
||
newP->frch_last = NULL;
|
||
}
|
||
/*
|
||
* Here with frcP ->ing to the frchainS for subseg.
|
||
*/
|
||
frchain_now = frcP;
|
||
/*
|
||
* Make a fresh frag for the subsegment.
|
||
*/
|
||
/* We expect this to happen on a correct boundary since it was
|
||
proceeded by a obstack_done(). */
|
||
tmp = obstack_alignment_mask (&frags); /* JF disable alignment */
|
||
obstack_alignment_mask (&frags) = 0;
|
||
frag_now = (fragS *) obstack_alloc (&frags, SIZEOF_STRUCT_FRAG);
|
||
memset (frag_now, 0, SIZEOF_STRUCT_FRAG);
|
||
obstack_alignment_mask (&frags) = tmp;
|
||
/* But we want any more chars to come immediately after the
|
||
structure we just made. */
|
||
new_fragP = frag_now;
|
||
new_fragP->fr_next = NULL;
|
||
/*
|
||
* Append new frag to current frchain.
|
||
*/
|
||
former_last_fragP = frcP->frch_last;
|
||
if (former_last_fragP)
|
||
{
|
||
know (former_last_fragP->fr_next == NULL);
|
||
know (frchain_now->frch_root);
|
||
former_last_fragP->fr_next = new_fragP;
|
||
}
|
||
else
|
||
{
|
||
frcP->frch_root = new_fragP;
|
||
}
|
||
frcP->frch_last = new_fragP;
|
||
}
|
||
|
||
/*
|
||
* 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);
|
||
#endif
|
||
|
||
if (seg != now_seg || subseg != now_subseg)
|
||
{ /* we just changed sub-segments */
|
||
subseg_set_rest (seg, subseg);
|
||
}
|
||
}
|
||
|
||
#else /* BFD_ASSEMBLER */
|
||
|
||
segT
|
||
subseg_new (segname, subseg)
|
||
const char *segname;
|
||
subsegT subseg;
|
||
{
|
||
segT secptr;
|
||
segment_info_type *seginfo;
|
||
const char *now_seg_name = (now_seg
|
||
? bfd_get_section_name (stdoutput, now_seg)
|
||
: 0);
|
||
|
||
if (now_seg_name
|
||
&& (now_seg_name == segname
|
||
|| !strcmp (now_seg_name, segname))
|
||
&& subseg == now_subseg)
|
||
return now_seg;
|
||
|
||
secptr = bfd_make_section_old_way (stdoutput, segname);
|
||
seginfo = seg_info (secptr);
|
||
if (! seginfo)
|
||
{
|
||
secptr->output_section = secptr;
|
||
seginfo = (segment_info_type *) xmalloc (sizeof (*seginfo));
|
||
seginfo->fix_root = 0;
|
||
seginfo->fix_tail = 0;
|
||
seginfo->bfd_section = secptr;
|
||
bfd_set_section_userdata (stdoutput, secptr, (char *) seginfo);
|
||
subseg_set_rest (secptr, subseg);
|
||
seginfo->frchainP = frchain_now;
|
||
seginfo->lineno_list_head = seginfo->lineno_list_tail = 0;
|
||
seginfo->sym = 0;
|
||
seginfo->dot = 0;
|
||
seginfo->hadone = 0;
|
||
seginfo->user_stuff = 0;
|
||
}
|
||
else
|
||
subseg_set_rest (secptr, subseg);
|
||
return secptr;
|
||
}
|
||
|
||
void
|
||
subseg_set (secptr, subseg)
|
||
segT secptr;
|
||
subsegT subseg;
|
||
{
|
||
if (! (secptr == now_seg && subseg == now_subseg))
|
||
subseg_set_rest (secptr, subseg);
|
||
}
|
||
|
||
#endif /* BFD_ASSEMBLER */
|
||
|
||
/* end of subsegs.c */
|