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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]$
53 lines
1.8 KiB
C
53 lines
1.8 KiB
C
/* Architecture-specific glibc-hwcaps subdirectories. x86 version.
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Copyright (C) 2020-2021 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#include <dl-hwcaps.h>
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#include <cpu-features.h>
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#include <get-isa-level.h>
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const char _dl_hwcaps_subdirs[] = "x86-64-v4:x86-64-v3:x86-64-v2";
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enum { subdirs_count = 3 }; /* Number of components in _dl_hwcaps_subdirs. */
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uint32_t
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_dl_hwcaps_subdirs_active (void)
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{
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const struct cpu_features *cpu_features
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= __x86_get_cpu_features (COMMON_CPUID_INDEX_MAX);
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unsigned int isa_level = get_isa_level (cpu_features);
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int active = 0;
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/* Test in reverse preference order. */
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/* x86-64-v2. */
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if (!(isa_level & GNU_PROPERTY_X86_ISA_1_V2))
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return _dl_hwcaps_subdirs_build_bitmask (subdirs_count, active);
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++active;
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/* x86-64-v3. */
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if (!(isa_level & GNU_PROPERTY_X86_ISA_1_V3))
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return _dl_hwcaps_subdirs_build_bitmask (subdirs_count, active);
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++active;
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/* x86-64-v4. */
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if (!(isa_level & GNU_PROPERTY_X86_ISA_1_V4))
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return _dl_hwcaps_subdirs_build_bitmask (subdirs_count, active);
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++active;
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return _dl_hwcaps_subdirs_build_bitmask (subdirs_count, active);
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}
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