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Use ud2 assembly mnemonic when available. 

gcc/
	* configure.ac (HAVE_AS_IX86_UD2): New test for 'ud2' mnemonic.
	* configure: Regenerated.
	* config.in: Regenerated.
	* config/i386/i386.md (trap) [HAVE_AS_IX86_UD2]: Use the mnemonic
	instead of ASM_SHORT.

From-SVN: r207789
This commit is contained in:
Roland McGrath 2014-02-14 17:37:23 +00:00 committed by Roland McGrath
parent f8cdff388d
commit 88f7c49a8b
5 changed files with 58 additions and 1 deletions
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8
gcc/ChangeLog
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@ -1,3 +1,11 @@
2014-02-14 Roland McGrath <mcgrathr@google.com>
* configure.ac (HAVE_AS_IX86_UD2): New test for 'ud2' mnemonic.
* configure: Regenerated.
* config.in: Regenerated.
* config/i386/i386.md (trap) [HAVE_AS_IX86_UD2]: Use the mnemonic
instead of ASM_SHORT.
2014-02-14 Vladimir Makarov <vmakarov@redhat.com>
Richard Earnshaw <rearnsha@arm.com>

6
gcc/config.in
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@ -375,6 +375,12 @@
#endif
/* Define if your assembler supports the 'ud2' mnemonic. */
#ifndef USED_FOR_TARGET
#undef HAVE_AS_IX86_UD2
#endif
/* Define if your assembler supports the lituse_jsrdirect relocation. */
#ifndef USED_FOR_TARGET
#undef HAVE_AS_JSRDIRECT_RELOCS

8
gcc/config/i386/i386.md
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@ -17843,7 +17843,13 @@
(define_insn "trap"
[(trap_if (const_int 1) (const_int 6))]
""
{ return ASM_SHORT "0x0b0f"; }
{
#ifdef HAVE_AS_IX86_UD2
return "ud2";
#else
return ASM_SHORT "0x0b0f";
#endif
}
[(set_attr "length" "2")])
(define_expand "prefetch"

31
gcc/configure vendored
View File

@ -25107,6 +25107,37 @@ if test $gcc_cv_as_ix86_rep_lock_prefix = yes; then
$as_echo "#define HAVE_AS_IX86_REP_LOCK_PREFIX 1" >>confdefs.h
fi
{ $as_echo "$as_me:${as_lineno-$LINENO}: checking assembler for ud2 mnemonic" >&5
$as_echo_n "checking assembler for ud2 mnemonic... " >&6; }
if test "${gcc_cv_as_ix86_ud2+set}" = set; then :
$as_echo_n "(cached) " >&6
else
gcc_cv_as_ix86_ud2=no
if test x$gcc_cv_as != x; then
$as_echo 'ud2' > conftest.s
if { ac_try='$gcc_cv_as $gcc_cv_as_flags -o conftest.o conftest.s >&5'
{ { eval echo "\"\$as_me\":${as_lineno-$LINENO}: \"$ac_try\""; } >&5
(eval $ac_try) 2>&5
ac_status=$?
$as_echo "$as_me:${as_lineno-$LINENO}: \$? = $ac_status" >&5
test $ac_status = 0; }; }
then
gcc_cv_as_ix86_ud2=yes
else
echo "configure: failed program was" >&5
cat conftest.s >&5
fi
rm -f conftest.o conftest.s
fi
fi
{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $gcc_cv_as_ix86_ud2" >&5
$as_echo "$gcc_cv_as_ix86_ud2" >&6; }
if test $gcc_cv_as_ix86_ud2 = yes; then
$as_echo "#define HAVE_AS_IX86_UD2 1" >>confdefs.h
fi
{ $as_echo "$as_me:${as_lineno-$LINENO}: checking assembler for R_386_TLS_GD_PLT reloc" >&5

6
gcc/configure.ac
View File

@ -3895,6 +3895,12 @@ foo: nop
[AC_DEFINE(HAVE_AS_IX86_REP_LOCK_PREFIX, 1,
[Define if the assembler supports 'rep <insn>, lock <insn>'.])])
gcc_GAS_CHECK_FEATURE([ud2 mnemonic],
gcc_cv_as_ix86_ud2,,,
[ud2],,
[AC_DEFINE(HAVE_AS_IX86_UD2, 1,
[Define if your assembler supports the 'ud2' mnemonic.])])
gcc_GAS_CHECK_FEATURE([R_386_TLS_GD_PLT reloc],
gcc_cv_as_ix86_tlsgdplt,,,
[call tls_gd@tlsgdplt],