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| author | Mark Shinwell <shinwell@codesourcery.com> | 2007-03-23 10:43:35 +0000 |
|---|---|---|
| committer | Mark Shinwell <shinwell@codesourcery.com> | 2007-03-23 10:43:35 +0000 |
| commit | 738755b09abcd97a6869857116135a38cdfd9bea (patch) | |
| tree | 448e5453ce08d6b3ffd51763bfc0874aed2f03fe /gas/config | |
| parent | a1ac8190312a85c3726a7cfbdd938462cec9907b (diff) | |
| download | gdb-738755b09abcd97a6869857116135a38cdfd9bea.zip gdb-738755b09abcd97a6869857116135a38cdfd9bea.tar.gz gdb-738755b09abcd97a6869857116135a38cdfd9bea.tar.bz2 | |
gas/
* config/tc-arm.c (md_apply_fix): Turn CZB instructions that
attempt to jump to the next instruction into NOPs.
Diffstat (limited to 'gas/config')
| -rw-r--r-- | gas/config/tc-arm.c | 26 |
1 files changed, 21 insertions, 5 deletions
diff --git a/gas/config/tc-arm.c b/gas/config/tc-arm.c index aa2ac05..72ff8f4 100644 --- a/gas/config/tc-arm.c +++ b/gas/config/tc-arm.c @@ -18101,16 +18101,32 @@ md_apply_fix (fixS * fixP, case BFD_RELOC_THUMB_PCREL_BRANCH7: /* CBZ */ /* 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 |= ((value & 0x3e) << 2) | ((value & 0x40) << 3); + newval = 0xbf00; /* NOP encoding T1 */ 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; case BFD_RELOC_THUMB_PCREL_BRANCH9: /* Conditional branch. */ |