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5222 serge 1
/* literal.c - GAS literal pool management.
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   Copyright (C) 1994-2015 Free Software Foundation, Inc.
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   Written by Ken Raeburn (raeburn@cygnus.com).
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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 3, 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
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   the Free Software Foundation, 51 Franklin Street - Fifth Floor,
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   Boston, MA 02110-1301, USA.  */
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/* This isn't quite a "constant" pool.  Some of the values may get
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   adjusted at run time, e.g., for symbolic relocations when shared
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   libraries are in use.  It's more of a "literal" pool.
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   On the Alpha, this should be used for .lita and .lit8.  (Is there
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   ever a .lit4?)  On the MIPS, it could be used for .lit4 as well.
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   The expressions passed here should contain either constants or symbols,
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   not a combination of both.  Typically, the constant pool is accessed
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   with some sort of GP register, so the size of the pool must be kept down
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   if possible.  The exception is section offsets -- if you're storing a
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   pointer to the start of .data, for example, and your machine provides
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   for 16-bit signed addends, you might want to store .data+32K, so that
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   you can access all of the first 64K of .data with the one pointer.
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   This isn't a requirement, just a guideline that can help keep .o file
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   size down.  */
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#include "as.h"
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#include "subsegs.h"
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#ifdef NEED_LITERAL_POOL
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valueT
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add_to_literal_pool (sym, addend, sec, size)
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     symbolS *sym;
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     valueT addend;
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     segT sec;
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     int size;
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{
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  segT current_section = now_seg;
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  int current_subsec = now_subseg;
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  valueT offset;
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  bfd_reloc_code_real_type reloc_type;
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  char *p;
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  segment_info_type *seginfo = seg_info (sec);
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  fixS *fixp;
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  offset = 0;
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  /* @@ This assumes all entries in a given section will be of the same
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     size...  Probably correct, but unwise to rely on.  */
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  /* This must always be called with the same subsegment.  */
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  if (seginfo->frchainP)
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    for (fixp = seginfo->frchainP->fix_root;
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	 fixp != (fixS *) NULL;
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	 fixp = fixp->fx_next, offset += size)
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      {
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	if (fixp->fx_addsy == sym && fixp->fx_offset == addend)
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	  return offset;
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      }
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  subseg_set (sec, 0);
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  p = frag_more (size);
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  memset (p, 0, size);
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  switch (size)
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    {
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    case 4:
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      reloc_type = BFD_RELOC_32;
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      break;
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    case 8:
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      reloc_type = BFD_RELOC_64;
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      break;
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    default:
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      abort ();
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    }
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  fix_new (frag_now, p - frag_now->fr_literal, size, sym, addend, 0,
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	   reloc_type);
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  subseg_set (current_section, current_subsec);
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  offset = seginfo->literal_pool_size;
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  seginfo->literal_pool_size += size;
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  return offset;
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}
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#endif