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x86: Check ifunc resolver with CPU_FEATURE_USABLE [BZ #27072]
Check ifunc resolver with CPU_FEATURE_USABLE and tunables in dynamic and static executables to verify that CPUID features are initialized early in static PIE. Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
This commit is contained in:
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46c1c765d1
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7a5ab88e21
@ -10,6 +10,16 @@ sysdep_headers += sys/platform/x86.h
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tests += tst-get-cpu-features tst-get-cpu-features-static \
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tst-cpu-features-cpuinfo tst-cpu-features-supports
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tests-static += tst-get-cpu-features-static
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ifeq (yes,$(have-ifunc))
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tests += \
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tst-ifunc-isa-1 \
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tst-ifunc-isa-1-static \
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tst-ifunc-isa-2 \
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tst-ifunc-isa-2-static
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tests-static += \
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tst-ifunc-isa-1-static \
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tst-ifunc-isa-2-static
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endif
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ifeq (yes,$(enable-x86-isa-level))
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tests += tst-isa-level-1
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modules-names += tst-isa-level-mod-1-baseline \
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@ -40,6 +50,10 @@ $(objpfx)tst-isa-level-1.out: $(objpfx)tst-isa-level-mod-1-baseline.so \
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$(objpfx)tst-isa-level-mod-1-v3.so \
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$(objpfx)tst-isa-level-mod-1-v4.so
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endif
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ifneq ($(have-tunables),no)
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tst-ifunc-isa-2-ENV = GLIBC_TUNABLES=glibc.cpu.hwcaps=-SSE4_2,-AVX,-AVX2,-AVX512F
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tst-ifunc-isa-2-static-ENV = $(tst-ifunc-isa-2-ENV)
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endif
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endif
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ifeq ($(subdir),math)
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1
sysdeps/x86/tst-ifunc-isa-1-static.c
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1
sysdeps/x86/tst-ifunc-isa-1-static.c
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@ -0,0 +1 @@
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#include "tst-ifunc-isa-1.c"
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30
sysdeps/x86/tst-ifunc-isa-1.c
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30
sysdeps/x86/tst-ifunc-isa-1.c
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@ -0,0 +1,30 @@
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/* Check 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 <stdlib.h>
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#include "tst-ifunc-isa.h"
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static int
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do_test (void)
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{
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enum isa value = foo ();
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enum isa expected = get_isa ();
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return value == expected ? EXIT_SUCCESS : EXIT_FAILURE;
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}
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#include <support/test-driver.c>
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1
sysdeps/x86/tst-ifunc-isa-2-static.c
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1
sysdeps/x86/tst-ifunc-isa-2-static.c
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@ -0,0 +1 @@
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#include "tst-ifunc-isa-2.c"
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sysdeps/x86/tst-ifunc-isa-2.c
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34
sysdeps/x86/tst-ifunc-isa-2.c
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@ -0,0 +1,34 @@
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/* Check IFUNC resolver with CPU_FEATURE_USABLE and tunables.
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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 <stdlib.h>
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#include "tst-ifunc-isa.h"
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#include <support/test-driver.h>
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static int
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do_test (void)
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{
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/* CPU must support SSE2. */
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if (!__builtin_cpu_supports ("sse2"))
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return EXIT_UNSUPPORTED;
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enum isa value = foo ();
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/* All ISAs, but SSE2, are disabled by tunables. */
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return value == sse2 ? EXIT_SUCCESS : EXIT_FAILURE;
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}
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#include <support/test-driver.c>
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sysdeps/x86/tst-ifunc-isa.h
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104
sysdeps/x86/tst-ifunc-isa.h
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@ -0,0 +1,104 @@
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/* 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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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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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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