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author | Richard Henderson <rth@redhat.com> | 1999-05-03 07:29:11 +0000 |
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committer | Richard Henderson <rth@redhat.com> | 1999-05-03 07:29:11 +0000 |
commit | 252b5132c753830d5fd56823373aed85f2a0db63 (patch) | |
tree | 1af963bfd8d3e55167b81def4207f175eaff3a56 /gas/literal.c | |
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19990502 sourceware importbinu_ss_19990502
Diffstat (limited to 'gas/literal.c')
-rw-r--r-- | gas/literal.c | 95 |
1 files changed, 95 insertions, 0 deletions
diff --git a/gas/literal.c b/gas/literal.c new file mode 100644 index 0000000..a3f8fc4 --- /dev/null +++ b/gas/literal.c @@ -0,0 +1,95 @@ +/* as.c - GAS literal pool management. + Copyright (C) 1994 Free Software Foundation, Inc. + Written by Ken Raeburn (raeburn@cygnus.com). + + 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. */ + +/* This isn't quite a "constant" pool. Some of the values may get + adjusted at run time, e.g., for symbolic relocations when shared + libraries are in use. It's more of a "literal" pool. + + On the Alpha, this should be used for .lita and .lit8. (Is there + ever a .lit4?) On the MIPS, it could be used for .lit4 as well. + + The expressions passed here should contain either constants or symbols, + not a combination of both. Typically, the constant pool is accessed + with some sort of GP register, so the size of the pool must be kept down + if possible. The exception is section offsets -- if you're storing a + pointer to the start of .data, for example, and your machine provides + for 16-bit signed addends, you might want to store .data+32K, so that + you can access all of the first 64K of .data with the one pointer. + + This isn't a requirement, just a guideline that can help keep .o file + size down. */ + +#include "as.h" +#include "subsegs.h" + +#if defined (BFD_ASSEMBLER) && defined (NEED_LITERAL_POOL) + +valueT +add_to_literal_pool (sym, addend, sec, size) + symbolS *sym; + valueT addend; + segT sec; + int size; +{ + segT current_section = now_seg; + int current_subsec = now_subseg; + valueT offset; + bfd_reloc_code_real_type reloc_type; + char *p; + segment_info_type *seginfo = seg_info (sec); + fixS *fixp; + + offset = 0; + /* @@ This assumes all entries in a given section will be of the same + size... Probably correct, but unwise to rely on. */ + /* This must always be called with the same subsegment. */ + if (seginfo->frchainP) + for (fixp = seginfo->frchainP->fix_root; + fixp != (fixS *) NULL; + fixp = fixp->fx_next, offset += size) + { + if (fixp->fx_addsy == sym && fixp->fx_offset == addend) + return offset; + } + + subseg_set (sec, 0); + p = frag_more (size); + memset (p, 0, size); + + switch (size) + { + case 4: + reloc_type = BFD_RELOC_32; + break; + case 8: + reloc_type = BFD_RELOC_64; + break; + default: + abort (); + } + fix_new (frag_now, p - frag_now->fr_literal, size, sym, addend, 0, + reloc_type); + + subseg_set (current_section, current_subsec); + offset = seginfo->literal_pool_size; + seginfo->literal_pool_size += size; + return offset; +} +#endif /* BFD_ASSEMBLER */ |