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https://github.com/darlinghq/darling-gdb.git
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0e389e770d
final period or newline, don't say "ignored" or "zero assumed" for as_bad messages. In some cases, change the wording to that used elsewhere for similar messages. * app.c, as.c, atof-generic.c, cgen.c, cond.c, depend.c, dwarf2dbg.c, ecoff.c, expr.c, frags.c, input-file.c, input-scrub.c, listing.c, output-file.c, stabs.c, subsegs.c, symbols.c, write.c: Likewise. * ecoff.c (ecoff_directive_end): Test for missing name by comparing input line pointers rather than reading string. (ecoff_directive_ent): Likewise. * read.c (s_set): Likewise. (s_align): Report a warning rather than an error for alignment too large. (s_comm): Check for missing symbol name. (s_lcomm_internal): Likewise. (s_lsym): Likewise. (s_globl): Use is_end_of_line instead of looking for '\n'. (s_lcomm_internal): Likewise. (ignore_rest_of_line): Report a warning rather than an error.
661 lines
16 KiB
C
661 lines
16 KiB
C
/* subsegs.c - subsegments -
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Copyright 1987, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998,
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1999, 2000
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Free Software Foundation, Inc.
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This file is part of GAS, the GNU Assembler.
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GAS is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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GAS is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GAS; see the file COPYING. If not, write to the Free
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Software Foundation, 59 Temple Place - Suite 330, Boston, MA
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02111-1307, USA. */
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/* Segments & sub-segments. */
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#include "as.h"
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#include "subsegs.h"
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#include "obstack.h"
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frchainS *frchain_root, *frchain_now;
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static struct obstack frchains;
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#ifndef BFD_ASSEMBLER
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#ifdef MANY_SEGMENTS
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segment_info_type segment_info[SEG_MAXIMUM_ORDINAL];
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#else
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/* Commented in "subsegs.h". */
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frchainS *data0_frchainP, *bss0_frchainP;
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#endif /* MANY_SEGMENTS */
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char const *const seg_name[] = {
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"absolute",
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#ifdef MANY_SEGMENTS
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"e0", "e1", "e2", "e3", "e4", "e5", "e6", "e7", "e8", "e9",
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"e10", "e11", "e12", "e13", "e14", "e15", "e16", "e17", "e18", "e19",
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"e20", "e21", "e22", "e23", "e24", "e25", "e26", "e27", "e28", "e29",
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"e30", "e31", "e32", "e33", "e34", "e35", "e36", "e37", "e38", "e39",
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#else
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"text",
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"data",
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"bss",
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#endif /* MANY_SEGMENTS */
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"unknown",
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"ASSEMBLER-INTERNAL-LOGIC-ERROR!",
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"expr",
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"debug",
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"transfert vector preload",
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"transfert vector postload",
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"register",
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"",
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}; /* Used by error reporters, dumpers etc. */
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#else /* BFD_ASSEMBLER */
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/* Gas segment information for bfd_abs_section_ptr and
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bfd_und_section_ptr. */
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static segment_info_type *abs_seg_info;
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static segment_info_type *und_seg_info;
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#endif /* BFD_ASSEMBLER */
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static void subseg_set_rest PARAMS ((segT, subsegT));
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static fragS dummy_frag;
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static frchainS absolute_frchain;
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void
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subsegs_begin ()
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{
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/* Check table(s) seg_name[], seg_N_TYPE[] is in correct order */
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#if !defined (MANY_SEGMENTS) && !defined (BFD_ASSEMBLER)
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know (SEG_ABSOLUTE == 0);
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know (SEG_TEXT == 1);
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know (SEG_DATA == 2);
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know (SEG_BSS == 3);
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know (SEG_UNKNOWN == 4);
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know (SEG_GOOF == 5);
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know (SEG_EXPR == 6);
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know (SEG_DEBUG == 7);
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know (SEG_NTV == 8);
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know (SEG_PTV == 9);
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know (SEG_REGISTER == 10);
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know (SEG_MAXIMUM_ORDINAL == SEG_REGISTER);
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#endif
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obstack_begin (&frchains, chunksize);
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#if __GNUC__ >= 2
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obstack_alignment_mask (&frchains) = __alignof__ (frchainS) - 1;
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#endif
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frchain_root = NULL;
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frchain_now = NULL; /* Warn new_subseg() that we are booting. */
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frag_now = &dummy_frag;
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#ifndef BFD_ASSEMBLER
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now_subseg = 42; /* Lie for 1st call to subseg_new. */
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#ifdef MANY_SEGMENTS
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{
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int i;
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for (i = SEG_E0; i < SEG_UNKNOWN; i++)
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{
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subseg_set (i, 0);
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segment_info[i].frchainP = frchain_now;
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}
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}
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#else
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subseg_set (SEG_DATA, 0); /* .data 0 */
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data0_frchainP = frchain_now;
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subseg_set (SEG_BSS, 0);
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bss0_frchainP = frchain_now;
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#endif /* ! MANY_SEGMENTS */
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#endif /* ! BFD_ASSEMBLER */
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absolute_frchain.frch_seg = absolute_section;
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absolute_frchain.frch_subseg = 0;
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#ifdef BFD_ASSEMBLER
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absolute_frchain.fix_root = absolute_frchain.fix_tail = 0;
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#endif
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absolute_frchain.frch_frag_now = &zero_address_frag;
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absolute_frchain.frch_root = absolute_frchain.frch_last = &zero_address_frag;
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}
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/*
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* subseg_change()
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*
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* Change the subsegment we are in, BUT DO NOT MAKE A NEW FRAG for the
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* subsegment. If we are already in the correct subsegment, change nothing.
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* This is used eg as a worker for subseg_set [which does make a new frag_now]
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* and for changing segments after we have read the source. We construct eg
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* fixSs even after the source file is read, so we do have to keep the
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* segment context correct.
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*/
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void
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subseg_change (seg, subseg)
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register segT seg;
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register int subseg;
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{
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now_seg = seg;
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now_subseg = subseg;
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if (now_seg == absolute_section)
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return;
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#ifdef BFD_ASSEMBLER
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{
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segment_info_type *seginfo;
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seginfo = (segment_info_type *) bfd_get_section_userdata (stdoutput, seg);
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if (! seginfo)
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{
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seginfo = (segment_info_type *) xmalloc (sizeof (*seginfo));
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memset ((PTR) seginfo, 0, sizeof (*seginfo));
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seginfo->fix_root = NULL;
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seginfo->fix_tail = NULL;
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seginfo->bfd_section = seg;
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seginfo->sym = 0;
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if (seg == bfd_abs_section_ptr)
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abs_seg_info = seginfo;
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else if (seg == bfd_und_section_ptr)
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und_seg_info = seginfo;
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else
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bfd_set_section_userdata (stdoutput, seg, (PTR) seginfo);
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}
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}
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#else
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#ifdef MANY_SEGMENTS
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seg_fix_rootP = &segment_info[seg].fix_root;
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seg_fix_tailP = &segment_info[seg].fix_tail;
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#else
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if (seg == SEG_DATA)
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{
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seg_fix_rootP = &data_fix_root;
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seg_fix_tailP = &data_fix_tail;
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}
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else if (seg == SEG_TEXT)
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{
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seg_fix_rootP = &text_fix_root;
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seg_fix_tailP = &text_fix_tail;
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}
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else
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{
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know (seg == SEG_BSS);
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seg_fix_rootP = &bss_fix_root;
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seg_fix_tailP = &bss_fix_tail;
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}
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#endif
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#endif
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}
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static void
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subseg_set_rest (seg, subseg)
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segT seg;
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subsegT subseg;
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{
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register frchainS *frcP; /* crawl frchain chain */
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register frchainS **lastPP; /* address of last pointer */
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frchainS *newP; /* address of new frchain */
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mri_common_symbol = NULL;
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if (frag_now && frchain_now)
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frchain_now->frch_frag_now = frag_now;
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assert (frchain_now == 0
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|| now_seg == undefined_section
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|| now_seg == absolute_section
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|| frchain_now->frch_last == frag_now);
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subseg_change (seg, (int) subseg);
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if (seg == absolute_section)
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{
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frchain_now = &absolute_frchain;
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frag_now = &zero_address_frag;
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return;
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}
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assert (frchain_now == 0
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|| now_seg == undefined_section
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|| frchain_now->frch_last == frag_now);
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/*
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* Attempt to find or make a frchain for that sub seg.
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* Crawl along chain of frchainSs, begins @ frchain_root.
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* If we need to make a frchainS, link it into correct
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* position of chain rooted in frchain_root.
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*/
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for (frcP = *(lastPP = &frchain_root);
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frcP && frcP->frch_seg <= seg;
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frcP = *(lastPP = &frcP->frch_next))
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{
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if (frcP->frch_seg == seg
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&& frcP->frch_subseg >= subseg)
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{
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break;
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}
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}
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/*
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* frcP: Address of the 1st frchainS in correct segment with
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* frch_subseg >= subseg.
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* We want to either use this frchainS, or we want
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* to insert a new frchainS just before it.
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*
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* If frcP==NULL, then we are at the end of the chain
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* of frchainS-s. A NULL frcP means we fell off the end
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* of the chain looking for a
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* frch_subseg >= subseg, so we
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* must make a new frchainS.
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*
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* If we ever maintain a pointer to
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* the last frchainS in the chain, we change that pointer
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* ONLY when frcP==NULL.
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*
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* lastPP: Address of the pointer with value frcP;
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* Never NULL.
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* May point to frchain_root.
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*
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*/
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if (!frcP
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|| (frcP->frch_seg > seg
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|| frcP->frch_subseg > subseg)) /* Kinky logic only works with 2 segments. */
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{
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/*
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* This should be the only code that creates a frchainS.
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*/
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newP = (frchainS *) obstack_alloc (&frchains, sizeof (frchainS));
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newP->frch_subseg = subseg;
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newP->frch_seg = seg;
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#ifdef BFD_ASSEMBLER
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newP->fix_root = NULL;
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newP->fix_tail = NULL;
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#endif
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obstack_begin (&newP->frch_obstack, chunksize);
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#if __GNUC__ >= 2
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obstack_alignment_mask (&newP->frch_obstack) = __alignof__ (fragS) - 1;
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#endif
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newP->frch_frag_now = frag_alloc (&newP->frch_obstack);
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newP->frch_frag_now->fr_type = rs_fill;
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newP->frch_root = newP->frch_last = newP->frch_frag_now;
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*lastPP = newP;
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newP->frch_next = frcP; /* perhaps NULL */
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#ifdef BFD_ASSEMBLER
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{
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segment_info_type *seginfo;
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seginfo = seg_info (seg);
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if (seginfo && seginfo->frchainP == frcP)
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seginfo->frchainP = newP;
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}
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#endif
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frcP = newP;
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}
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/*
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* Here with frcP pointing to the frchainS for subseg.
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*/
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frchain_now = frcP;
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frag_now = frcP->frch_frag_now;
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assert (frchain_now->frch_last == frag_now);
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}
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/*
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* subseg_set(segT, subsegT)
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*
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* If you attempt to change to the current subsegment, nothing happens.
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*
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* In: segT, subsegT code for new subsegment.
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* frag_now -> incomplete frag for current subsegment.
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* If frag_now==NULL, then there is no old, incomplete frag, so
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* the old frag is not closed off.
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*
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* Out: now_subseg, now_seg updated.
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* Frchain_now points to the (possibly new) struct frchain for this
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* sub-segment.
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* Frchain_root updated if needed.
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*/
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#ifndef BFD_ASSEMBLER
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segT
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subseg_new (segname, subseg)
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const char *segname;
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subsegT subseg;
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{
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int i;
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for (i = 0; i < (int) SEG_MAXIMUM_ORDINAL; i++)
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{
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const char *s;
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s = segment_name ((segT) i);
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if (strcmp (segname, s) == 0
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|| (segname[0] == '.'
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&& strcmp (segname + 1, s) == 0))
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{
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subseg_set ((segT) i, subseg);
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return (segT) i;
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}
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#ifdef obj_segment_name
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s = obj_segment_name ((segT) i);
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if (strcmp (segname, s) == 0
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|| (segname[0] == '.'
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&& strcmp (segname + 1, s) == 0))
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{
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subseg_set ((segT) i, subseg);
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return (segT) i;
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}
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#endif
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}
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#ifdef obj_add_segment
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{
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segT new_seg;
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new_seg = obj_add_segment (segname);
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subseg_set (new_seg, subseg);
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return new_seg;
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}
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#else
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as_bad (_("attempt to switch to nonexistent segment \"%s\""), segname);
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return now_seg;
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#endif
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}
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void
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subseg_set (seg, subseg) /* begin assembly for a new sub-segment */
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register segT seg; /* SEG_DATA or SEG_TEXT */
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register subsegT subseg;
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{
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#ifndef MANY_SEGMENTS
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know (seg == SEG_DATA
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|| seg == SEG_TEXT
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|| seg == SEG_BSS
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|| seg == SEG_ABSOLUTE);
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#endif
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if (seg != now_seg || subseg != now_subseg)
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{ /* we just changed sub-segments */
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subseg_set_rest (seg, subseg);
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}
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mri_common_symbol = NULL;
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}
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#else /* BFD_ASSEMBLER */
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segT
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subseg_get (segname, force_new)
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const char *segname;
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int force_new;
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{
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segT secptr;
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segment_info_type *seginfo;
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const char *now_seg_name = (now_seg
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? bfd_get_section_name (stdoutput, now_seg)
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: 0);
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if (!force_new
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&& now_seg_name
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&& (now_seg_name == segname
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|| !strcmp (now_seg_name, segname)))
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return now_seg;
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if (!force_new)
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secptr = bfd_make_section_old_way (stdoutput, segname);
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else
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secptr = bfd_make_section_anyway (stdoutput, segname);
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seginfo = seg_info (secptr);
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if (! seginfo)
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{
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/* Check whether output_section is set first because secptr may
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be bfd_abs_section_ptr. */
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if (secptr->output_section != secptr)
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secptr->output_section = secptr;
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seginfo = (segment_info_type *) xmalloc (sizeof (*seginfo));
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memset ((PTR) seginfo, 0, sizeof (*seginfo));
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seginfo->fix_root = NULL;
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seginfo->fix_tail = NULL;
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seginfo->bfd_section = secptr;
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if (secptr == bfd_abs_section_ptr)
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abs_seg_info = seginfo;
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else if (secptr == bfd_und_section_ptr)
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und_seg_info = seginfo;
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else
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bfd_set_section_userdata (stdoutput, secptr, (PTR) seginfo);
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seginfo->frchainP = NULL;
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seginfo->lineno_list_head = seginfo->lineno_list_tail = NULL;
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seginfo->sym = NULL;
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seginfo->dot = NULL;
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}
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return secptr;
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}
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segT
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subseg_new (segname, subseg)
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const char *segname;
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subsegT subseg;
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{
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segT secptr;
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segment_info_type *seginfo;
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secptr = subseg_get (segname, 0);
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subseg_set_rest (secptr, subseg);
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seginfo = seg_info (secptr);
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if (! seginfo->frchainP)
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seginfo->frchainP = frchain_now;
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return secptr;
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}
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/* Like subseg_new, except a new section is always created, even if
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a section with that name already exists. */
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segT
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subseg_force_new (segname, subseg)
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const char *segname;
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subsegT subseg;
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{
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segT secptr;
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segment_info_type *seginfo;
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secptr = subseg_get (segname, 1);
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subseg_set_rest (secptr, subseg);
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seginfo = seg_info (secptr);
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if (! seginfo->frchainP)
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seginfo->frchainP = frchain_now;
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return secptr;
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}
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void
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subseg_set (secptr, subseg)
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segT secptr;
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subsegT subseg;
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{
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if (! (secptr == now_seg && subseg == now_subseg))
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subseg_set_rest (secptr, subseg);
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mri_common_symbol = NULL;
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}
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#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
|
||
#ifdef BFD_ASSEMBLER
|
||
|| symbol_table_frozen
|
||
#endif
|
||
)
|
||
{
|
||
/* 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);
|
||
|
||
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)
|
||
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", frchp,
|
||
segment_name (frchp->frch_seg), count);
|
||
}
|
||
}
|
||
|
||
/* end of subsegs.c */
|