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941ea10f80
__x86_get_cpuid_feature_leaf is called during early startup, before the stack check guard is initialized and is hence not safe to build with stack-protector. Additionally, IFUNC resolvers for static tst-ifunc-isa tests get called too early for stack protector to be useful, so fix them to disable stack protector for the resolver functions. This fixes all failures seen with --enable-stack-protector=all configuration. Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
107 lines
1.9 KiB
C
107 lines
1.9 KiB
C
/* IFUNC resolver with CPU_FEATURE_USABLE.
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Copyright (C) 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 <sys/platform/x86.h>
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enum isa
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{
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none,
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sse2,
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sse4_2,
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avx,
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avx2,
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avx512f
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};
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enum isa
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__attribute__ ((__optimize__ ("-fno-stack-protector")))
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get_isa (void)
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{
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if (CPU_FEATURE_USABLE (AVX512F))
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return avx512f;
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if (CPU_FEATURE_USABLE (AVX2))
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return avx2;
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if (CPU_FEATURE_USABLE (AVX))
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return avx;
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if (CPU_FEATURE_USABLE (SSE4_2))
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return sse4_2;
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if (CPU_FEATURE_USABLE (SSE2))
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return sse2;
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return none;
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}
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static int
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isa_sse2 (void)
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{
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return sse2;
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}
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static int
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isa_sse4_2 (void)
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{
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return sse4_2;
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}
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static int
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isa_avx (void)
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{
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return avx;
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}
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static int
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isa_avx2 (void)
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{
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return avx2;
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}
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static int
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isa_avx512f (void)
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{
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return avx512f;
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}
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static int
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isa_none (void)
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{
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return none;
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}
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int foo (void) __attribute__ ((ifunc ("foo_ifunc")));
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void *
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__attribute__ ((__optimize__ ("-fno-stack-protector")))
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foo_ifunc (void)
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{
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switch (get_isa ())
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{
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case avx512f:
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return isa_avx512f;
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case avx2:
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return isa_avx2;
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case avx:
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return isa_avx;
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case sse4_2:
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return isa_sse4_2;
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case sse2:
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return isa_sse2;
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default:
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break;
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}
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return isa_none;
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}
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