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| author | Igor Zamyatin <igor.zamyatin@intel.com> | 2015-07-09 06:50:12 -0700 |
|---|---|---|
| committer | H.J. Lu <hjl.tools@gmail.com> | 2015-07-09 06:50:12 -0700 |
| commit | 14c5cbabc2d11004ab223ae5eae761ddf83ef99e (patch) | |
| tree | ee8516f9bb7f2e9435d05641dfa415e795f7b65e /sysdeps/i386/configure | |
| parent | 632b3db8e2ba1f454872f7ebe1335966f8161c43 (diff) | |
Preserve bound registers for pointer pass/return
We need to save/restore bound registers and add a BND prefix before
branches in _dl_runtime_profile so that bound registers for pointer
pass and return are preserved when LD_AUDIT is used.
[BZ #18134]
* sysdeps/i386/configure.ac: Set HAVE_MPX_SUPPORT.
* sysdeps/i386/configure: Regenerated.
* sysdeps/i386/dl-trampoline.S (PRESERVE_BND_REGS_PREFIX): New.
(_dl_runtime_profile): Save and restore Intel MPX return bound
registers when calling _dl_call_pltexit. Add
PRESERVE_BND_REGS_PREFIX before return.
* sysdeps/i386/link-defines.sym (LRV_BND0_OFFSET): New.
(LRV_BND1_OFFSET): Likewise.
* sysdeps/x86/bits/link.h (La_i86_retval): Add lrv_bnd0 and
lrv_bnd1.
* sysdeps/x86_64/dl-trampoline.S (_dl_runtime_profile): Fix
typo in bndmov encoding.
* sysdeps/x86_64/dl-trampoline.h: Properly save and restore
Intel MPX bound registers. Add PRESERVE_BND_REGS_PREFIX before
branch instructions to preserve bounds.
Diffstat (limited to 'sysdeps/i386/configure')
| -rw-r--r-- | sysdeps/i386/configure | 27 |
1 files changed, 27 insertions, 0 deletions
diff --git a/sysdeps/i386/configure b/sysdeps/i386/configure index 6e89b597e3..ab66c08160 100644 --- a/sysdeps/i386/configure +++ b/sysdeps/i386/configure @@ -240,6 +240,33 @@ $as_echo "$libc_cv_cc_novzeroupper" >&6; } config_vars="$config_vars config-cflags-novzeroupper = $libc_cv_cc_novzeroupper" +{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for Intel MPX support" >&5 +$as_echo_n "checking for Intel MPX support... " >&6; } +if ${libc_cv_asm_mpx+:} false; then : + $as_echo_n "(cached) " >&6 +else + cat > conftest.s <<\EOF + bndmov %bnd0,(%esp) +EOF +if { ac_try='${CC-cc} -c $ASFLAGS conftest.s 1>&5' + { { eval echo "\"\$as_me\":${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 + libc_cv_asm_mpx=yes +else + libc_cv_asm_mpx=no +fi +rm -f conftest* +fi +{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $libc_cv_asm_mpx" >&5 +$as_echo "$libc_cv_asm_mpx" >&6; } +if test $libc_cv_asm_mpx == yes; then + $as_echo "#define HAVE_MPX_SUPPORT 1" >>confdefs.h + +fi + { $as_echo "$as_me:${as_lineno-$LINENO}: checking for AVX2 support" >&5 $as_echo_n "checking for AVX2 support... " >&6; } if ${libc_cv_cc_avx2+:} false; then : |