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* config/tc-arm.c (md_apply_fix): Turn CZB instructions that
	attempt to jump to the next instruction into NOPs.
This commit is contained in:
Mark Shinwell
2007-03-23 10:43:35 +00:00
parent a1ac819031
commit 738755b09a
2 changed files with 26 additions and 5 deletions
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5
gas/ChangeLog
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@ -1,3 +1,8 @@
2007-03-23 Mark Shinwell <shinwell@codesourcery.com>
* config/tc-arm.c (md_apply_fix): Turn CZB instructions that
attempt to jump to the next instruction into NOPs.
2007-03-23 Alan Modra <amodra@bigpond.net.au> 2007-03-23 Alan Modra <amodra@bigpond.net.au>
* config/tc-spu.c: Don't include opcode/spu.h. * config/tc-spu.c: Don't include opcode/spu.h.

26
gas/config/tc-arm.c
View File

@ -18101,16 +18101,32 @@ md_apply_fix (fixS * fixP,
case BFD_RELOC_THUMB_PCREL_BRANCH7: /* CBZ */ case BFD_RELOC_THUMB_PCREL_BRANCH7: /* CBZ */
/* CBZ can only branch forward. */ /* CBZ can only branch forward. */
if (value & ~0x7e)
as_bad_where (fixP->fx_file, fixP->fx_line,
_("branch out of range"));
if (fixP->fx_done || !seg->use_rela_p) /* Attempts to use CBZ to branch to the next instruction
(which, strictly speaking, are prohibited) will be turned into
no-ops.
FIXME: It may be better to remove the instruction completely and
perform relaxation. */
if (value == -2)
{ {
newval = md_chars_to_number (buf, THUMB_SIZE); newval = md_chars_to_number (buf, THUMB_SIZE);
newval |= ((value & 0x3e) << 2) | ((value & 0x40) << 3); newval = 0xbf00; /* NOP encoding T1 */
md_number_to_chars (buf, newval, THUMB_SIZE); md_number_to_chars (buf, newval, THUMB_SIZE);
} }
else
{
if (value & ~0x7e)
as_bad_where (fixP->fx_file, fixP->fx_line,
_("branch out of range"));
if (fixP->fx_done || !seg->use_rela_p)
{
newval = md_chars_to_number (buf, THUMB_SIZE);
newval |= ((value & 0x3e) << 2) | ((value & 0x40) << 3);
md_number_to_chars (buf, newval, THUMB_SIZE);
}
}
break; break;
case BFD_RELOC_THUMB_PCREL_BRANCH9: /* Conditional branch. */ case BFD_RELOC_THUMB_PCREL_BRANCH9: /* Conditional branch. */