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GCC 11 supports -march=x86-64-v[234] to enable x86 micro-architecture ISA levels: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=97250 and -mneeded to emit GNU_PROPERTY_X86_ISA_1_NEEDED property with GNU_PROPERTY_X86_ISA_1_V[234] marker: https://gitlab.com/x86-psABIs/x86-64-ABI/-/merge_requests/13 Binutils support for GNU_PROPERTY_X86_ISA_1_V[234] marker were added by commit b0ab06937385e0ae25cebf1991787d64f439bf12 Author: H.J. Lu <hjl.tools@gmail.com> Date: Fri Oct 30 06:49:57 2020 -0700 x86: Support GNU_PROPERTY_X86_ISA_1_BASELINE marker and commit 32930e4edbc06bc6f10c435dbcc63131715df678 Author: H.J. Lu <hjl.tools@gmail.com> Date: Fri Oct 9 05:05:57 2020 -0700 x86: Support GNU_PROPERTY_X86_ISA_1_V[234] marker GNU_PROPERTY_X86_ISA_1_NEEDED property in x86 ELF binaries indicate the micro-architecture ISA level required to execute the binary. The marker must be added by programmers explicitly in one of 3 ways: 1. Pass -mneeded to GCC. 2. Add the marker in the linker inputs as this patch does. 3. Pass -z x86-64-v[234] to the linker. Add GNU_PROPERTY_X86_ISA_1_BASELINE and GNU_PROPERTY_X86_ISA_1_V[234] marker support to ld.so if binutils 2.32 or newer is used to build glibc: 1. Add GNU_PROPERTY_X86_ISA_1_BASELINE and GNU_PROPERTY_X86_ISA_1_V[234] markers to elf.h. 2. Add GNU_PROPERTY_X86_ISA_1_BASELINE and GNU_PROPERTY_X86_ISA_1_V[234] marker to abi-note.o based on the ISA level used to compile abi-note.o, assuming that the same ISA level is used to compile the whole glibc. 3. Add isa_1 to cpu_features to record the supported x86 ISA level. 4. Rename _dl_process_cet_property_note to _dl_process_property_note and add GNU_PROPERTY_X86_ISA_1_V[234] marker detection. 5. Update _rtld_main_check and _dl_open_check to check loaded objects with the incompatible ISA level. 6. Add a testcase to verify that dlopen an x86-64-v4 shared object fails on lesser platforms. 7. Use <get-isa-level.h> in dl-hwcaps-subdirs.c and tst-glibc-hwcaps.c. Tested under i686, x32 and x86-64 modes on x86-64-v2, x86-64-v3 and x86-64-v4 machines. Marked elf/tst-isa-level-1 with x86-64-v4, ran it on x86-64-v3 machine and got: [hjl@gnu-cfl-2 build-x86_64-linux]$ ./elf/tst-isa-level-1 ./elf/tst-isa-level-1: CPU ISA level is lower than required [hjl@gnu-cfl-2 build-x86_64-linux]$
112 lines
2.9 KiB
Plaintext
112 lines
2.9 KiB
Plaintext
GLIBC_PROVIDES dnl See aclocal.m4 in the top level source directory.
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# Local configure fragment for sysdeps/x86.
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if test $enable_cet != no; then
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# Check if CET can be enabled.
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AC_CACHE_CHECK(whether CET can be enabled,
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libc_cv_x86_cet_available, [dnl
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cat > conftest.c <<EOF
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#if !defined __CET__ || __CET__ != 3
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# error CET isn't available.
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#endif
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EOF
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if AC_TRY_COMMAND(${CC-cc} -c $CFLAGS -fcf-protection -include cet.h conftest.c 1>&AS_MESSAGE_LOG_FD); then
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libc_cv_x86_cet_available=yes
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else
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libc_cv_x86_cet_available=no
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fi
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rm -rf conftest*])
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if test $libc_cv_x86_cet_available != yes; then
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AC_MSG_ERROR([$CC doesn't support CET])
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fi
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fi
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if test $enable_cet != no; then
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# Check if assembler supports CET.
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AC_CACHE_CHECK(whether $AS supports CET,
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libc_cv_x86_cet_as, [dnl
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cat > conftest.s <<EOF
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incsspd %ecx
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EOF
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if AC_TRY_COMMAND(${CC-cc} -c $CFLAGS conftest.s -o conftest.o 1>&AS_MESSAGE_LOG_FD); then
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libc_cv_x86_cet_as=yes
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else
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libc_cv_x86_cet_as=no
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fi
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rm -rf conftest*])
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if test $libc_cv_x86_cet_as = no; then
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AC_MSG_ERROR([$AS doesn't support CET])
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fi
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fi
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if test $enable_cet = yes; then
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AC_DEFINE(DEFAULT_DL_X86_CET_CONTROL, cet_elf_property)
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elif test $enable_cet = permissive; then
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AC_DEFINE(DEFAULT_DL_X86_CET_CONTROL, cet_permissive)
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fi
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LIBC_CONFIG_VAR([enable-cet], [$enable_cet])
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# Check if linker supports x86 ISA level.
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AC_CACHE_CHECK([for linker x86 ISA level support],
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libc_cv_include_x86_isa_level, [dnl
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cat > conftest1.S <<EOF
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#ifdef __LP64__
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# define P2ALIGN 3
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#else
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# define P2ALIGN 2
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#endif
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.section ".note.gnu.property", "a"
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.p2align P2ALIGN
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.long 1f - 0f /* name length. */
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.long 4f - 1f /* data length. */
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/* NT_GNU_PROPERTY_TYPE_0 */
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.long 5 /* note type. */
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0:
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.asciz "GNU" /* vendor name. */
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1:
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.p2align P2ALIGN
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/* GNU_PROPERTY_X86_ISA_1_NEEDED */
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.long 0xc0008002 /* pr_type. */
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.long 3f - 2f /* pr_datasz. */
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2:
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.long 0x1
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3:
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.p2align P2ALIGN
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4:
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EOF
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cat > conftest2.S <<EOF
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#ifdef __LP64__
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# define P2ALIGN 3
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#else
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# define P2ALIGN 2
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#endif
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.section ".note.gnu.property", "a"
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.p2align P2ALIGN
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.long 1f - 0f /* name length. */
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.long 4f - 1f /* data length. */
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/* NT_GNU_PROPERTY_TYPE_0 */
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.long 5 /* note type. */
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0:
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.asciz "GNU" /* vendor name. */
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1:
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.p2align P2ALIGN
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/* GNU_PROPERTY_X86_ISA_1_NEEDED */
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.long 0xc0008002 /* pr_type. */
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.long 3f - 2f /* pr_datasz. */
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2:
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.long 0x2
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3:
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.p2align P2ALIGN
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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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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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fi
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fi
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rm -f conftest*])
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if test $libc_cv_include_x86_isa_level = yes; then
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AC_DEFINE(INCLUDE_X86_ISA_LEVEL)
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fi
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LIBC_CONFIG_VAR([enable-x86-isa-level], [$libc_cv_include_x86_isa_level])
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