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commit ee9f98d9cac12e843ca59c6e4d4b225f58a66727
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Author: H.J. Lu <hjl.tools@gmail.com>
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Date: Tue Feb 2 13:45:58 2021 -0800
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x86: Set minimum x86-64 level marker [BZ #27318]
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Since the full ISA set used in an ELF binary is unknown to compiler,
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an x86-64 ISA level marker indicates the minimum, not maximum, ISA set
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required to run such an ELF binary. We never guarantee a library with
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an x86-64 ISA level v3 marker doesn't contain other ISAs beyond x86-64
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ISA level v3, like AVX VNNI. We check the x86-64 ISA level marker for
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the minimum ISA set. Since -march=sandybridge enables only some ISAs
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in x86-64 ISA level v3, we should set the needed ISA marker to v2.
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Otherwise, libc is compiled with -march=sandybridge will fail to run on
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Sandy Bridge:
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$ ./elf/ld.so ./libc.so
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./libc.so: (p) CPU ISA level is lower than required: needed: 7; got: 3
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Set the minimum, instead of maximum, x86-64 ISA level marker should have
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no impact on the glibc-hwcaps directory assignment logic in ldconfig nor
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ld.so.
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(cherry picked from commit 339bf918ea4830fb35614632e96f3aab3237adce)
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diff --git a/config.h.in b/config.h.in
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index 06ee8ae26a0eb833..f21bf04e4791e5dc 100644
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--- a/config.h.in
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+++ b/config.h.in
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@@ -275,4 +275,10 @@
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/* Define if x86 ISA level should be included in shared libraries. */
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#undef INCLUDE_X86_ISA_LEVEL
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+/* Define if -msahf is enabled by default on x86. */
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+#undef HAVE_X86_LAHF_SAHF
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+
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+/* Define if -mmovbe is enabled by default on x86. */
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+#undef HAVE_X86_MOVBE
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+
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#endif
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diff --git a/sysdeps/x86/configure b/sysdeps/x86/configure
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index 5e32dc62b334b27f..ead1295c38cf5f4e 100644
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--- a/sysdeps/x86/configure
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+++ b/sysdeps/x86/configure
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@@ -126,6 +126,8 @@ cat > conftest2.S <
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4:
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EOF
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libc_cv_include_x86_isa_level=no
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+libc_cv_have_x86_lahf_sahf=no
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+libc_cv_have_x86_movbe=no
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if { ac_try='${CC-cc} $CFLAGS $CPPFLAGS -nostartfiles -nostdlib -r -o conftest conftest1.S conftest2.S'
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{ { eval echo "\"\$as_me\":${as_lineno-$LINENO}: \"$ac_try\""; } >&5
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(eval $ac_try) 2>&5
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@@ -135,6 +137,24 @@ if { ac_try='${CC-cc} $CFLAGS $CPPFLAGS -nostartfiles -nostdlib -r -o conftest c
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count=`LC_ALL=C $READELF -n conftest | grep NT_GNU_PROPERTY_TYPE_0 | wc -l`
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if test "$count" = 1; then
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libc_cv_include_x86_isa_level=yes
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+ cat > conftest.c <
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+EOF
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+ if { ac_try='${CC-cc} $CFLAGS $CPPFLAGS -fverbose-asm -S -o - conftest.c'
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+ { { eval echo "\"\$as_me\":${as_lineno-$LINENO}: \"$ac_try\""; } >&5
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+ (eval $ac_try) 2>&5
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+ ac_status=$?
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+ $as_echo "$as_me:${as_lineno-$LINENO}: \$? = $ac_status" >&5
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+ test $ac_status = 0; }; } | grep -q "\-msahf"; then
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+ libc_cv_have_x86_lahf_sahf=yes
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+ fi
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+ if { ac_try='${CC-cc} $CFLAGS $CPPFLAGS -fverbose-asm -S -o - conftest.c'
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+ { { eval echo "\"\$as_me\":${as_lineno-$LINENO}: \"$ac_try\""; } >&5
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+ (eval $ac_try) 2>&5
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+ ac_status=$?
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+ $as_echo "$as_me:${as_lineno-$LINENO}: \$? = $ac_status" >&5
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+ test $ac_status = 0; }; } | grep -q "\-mmovbe"; then
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+ libc_cv_have_x86_movbe=yes
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+ fi
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fi
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fi
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rm -f conftest*
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@@ -144,6 +164,14 @@ $as_echo "$libc_cv_include_x86_isa_level" >&6; }
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if test $libc_cv_include_x86_isa_level = yes; then
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$as_echo "#define INCLUDE_X86_ISA_LEVEL 1" >>confdefs.h
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+fi
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+if test $libc_cv_have_x86_lahf_sahf = yes; then
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+ $as_echo "#define HAVE_X86_LAHF_SAHF 1" >>confdefs.h
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+
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+fi
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+if test $libc_cv_have_x86_movbe = yes; then
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+ $as_echo "#define HAVE_X86_MOVBE 1" >>confdefs.h
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+
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fi
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config_vars="$config_vars
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enable-x86-isa-level = $libc_cv_include_x86_isa_level"
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diff --git a/sysdeps/x86/configure.ac b/sysdeps/x86/configure.ac
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index f94088f377ec95ab..bca97fdc2f1ac1a7 100644
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--- a/sysdeps/x86/configure.ac
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+++ b/sysdeps/x86/configure.ac
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@@ -98,14 +98,30 @@ cat > conftest2.S <
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4:
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EOF
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libc_cv_include_x86_isa_level=no
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+libc_cv_have_x86_lahf_sahf=no
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+libc_cv_have_x86_movbe=no
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if AC_TRY_COMMAND(${CC-cc} $CFLAGS $CPPFLAGS -nostartfiles -nostdlib -r -o conftest conftest1.S conftest2.S); then
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count=`LC_ALL=C $READELF -n conftest | grep NT_GNU_PROPERTY_TYPE_0 | wc -l`
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if test "$count" = 1; then
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libc_cv_include_x86_isa_level=yes
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+ cat > conftest.c <
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+EOF
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+ if AC_TRY_COMMAND(${CC-cc} $CFLAGS $CPPFLAGS -fverbose-asm -S -o - conftest.c) | grep -q "\-msahf"; then
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+ libc_cv_have_x86_lahf_sahf=yes
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+ fi
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+ if AC_TRY_COMMAND(${CC-cc} $CFLAGS $CPPFLAGS -fverbose-asm -S -o - conftest.c) | grep -q "\-mmovbe"; then
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+ libc_cv_have_x86_movbe=yes
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+ fi
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fi
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fi
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rm -f conftest*])
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if test $libc_cv_include_x86_isa_level = yes; then
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AC_DEFINE(INCLUDE_X86_ISA_LEVEL)
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fi
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+if test $libc_cv_have_x86_lahf_sahf = yes; then
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+ AC_DEFINE(HAVE_X86_LAHF_SAHF)
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+fi
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+if test $libc_cv_have_x86_movbe = yes; then
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+ AC_DEFINE(HAVE_X86_MOVBE)
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+fi
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LIBC_CONFIG_VAR([enable-x86-isa-level], [$libc_cv_include_x86_isa_level])
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diff --git a/sysdeps/x86/isa-level.c b/sysdeps/x86/isa-level.c
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index aaf524cb56c99cb4..49ef4aa6122072cf 100644
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--- a/sysdeps/x86/isa-level.c
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+++ b/sysdeps/x86/isa-level.c
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@@ -29,32 +29,35 @@
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/* ELF program property for x86 ISA level. */
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#ifdef INCLUDE_X86_ISA_LEVEL
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-# if defined __x86_64__ || defined __FXSR__ || !defined _SOFT_FLOAT \
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- || defined __MMX__ || defined __SSE__ || defined __SSE2__
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+# if defined __SSE__ && defined __SSE2__
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+/* NB: ISAs, excluding MMX, in x86-64 ISA level baseline are used. */
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# define ISA_BASELINE GNU_PROPERTY_X86_ISA_1_BASELINE
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# else
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# define ISA_BASELINE 0
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# endif
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-# if defined __GCC_HAVE_SYNC_COMPARE_AND_SWAP_16 \
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- || (defined __x86_64__ && defined __LAHF_SAHF__) \
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- || defined __POPCNT__ || defined __SSE3__ \
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- || defined __SSSE3__ || defined __SSE4_1__ || defined __SSE4_2__
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+# if ISA_BASELINE && defined __GCC_HAVE_SYNC_COMPARE_AND_SWAP_16 \
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+ && defined HAVE_X86_LAHF_SAHF && defined __POPCNT__ \
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+ && defined __SSE3__ && defined __SSSE3__ && defined __SSE4_1__ \
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+ && defined __SSE4_2__
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+/* NB: ISAs in x86-64 ISA level v2 are used. */
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# define ISA_V2 GNU_PROPERTY_X86_ISA_1_V2
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# else
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# define ISA_V2 0
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# endif
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-# if defined __AVX__ || defined __AVX2__ || defined __F16C__ \
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- || defined __FMA__ || defined __LZCNT__ || defined __MOVBE__ \
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- || defined __XSAVE__
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+# if ISA_V2 && defined __AVX__ && defined __AVX2__ && defined __F16C__ \
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+ && defined __FMA__ && defined __LZCNT__ && defined HAVE_X86_MOVBE
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+/* NB: ISAs in x86-64 ISA level v3 are used. */
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# define ISA_V3 GNU_PROPERTY_X86_ISA_1_V3
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# else
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# define ISA_V3 0
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# endif
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-# if defined __AVX512F__ || defined __AVX512BW__ || defined __AVX512CD__ \
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- || defined __AVX512DQ__ || defined __AVX512VL__
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+# if ISA_V3 && defined __AVX512F__ && defined __AVX512BW__ \
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+ && defined __AVX512CD__ && defined __AVX512DQ__ \
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+ && defined __AVX512VL__
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+/* NB: ISAs in x86-64 ISA level v4 are used. */
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# define ISA_V4 GNU_PROPERTY_X86_ISA_1_V4
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# else
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# define ISA_V4 0
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