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:
H.J. Lu 2021-01-12 14:41:10 -08:00
parent 46c1c765d1
commit 7a5ab88e21
6 changed files with 184 additions and 0 deletions

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@ -10,6 +10,16 @@ sysdep_headers += sys/platform/x86.h
tests += tst-get-cpu-features tst-get-cpu-features-static \
tst-cpu-features-cpuinfo tst-cpu-features-supports
tests-static += tst-get-cpu-features-static
ifeq (yes,$(have-ifunc))
tests += \
tst-ifunc-isa-1 \
tst-ifunc-isa-1-static \
tst-ifunc-isa-2 \
tst-ifunc-isa-2-static
tests-static += \
tst-ifunc-isa-1-static \
tst-ifunc-isa-2-static
endif
ifeq (yes,$(enable-x86-isa-level))
tests += tst-isa-level-1
modules-names += tst-isa-level-mod-1-baseline \
@ -40,6 +50,10 @@ $(objpfx)tst-isa-level-1.out: $(objpfx)tst-isa-level-mod-1-baseline.so \
$(objpfx)tst-isa-level-mod-1-v3.so \
$(objpfx)tst-isa-level-mod-1-v4.so
endif
ifneq ($(have-tunables),no)
tst-ifunc-isa-2-ENV = GLIBC_TUNABLES=glibc.cpu.hwcaps=-SSE4_2,-AVX,-AVX2,-AVX512F
tst-ifunc-isa-2-static-ENV = $(tst-ifunc-isa-2-ENV)
endif
endif
ifeq ($(subdir),math)

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@ -0,0 +1 @@
#include "tst-ifunc-isa-1.c"

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@ -0,0 +1,30 @@
/* Check IFUNC resolver with CPU_FEATURE_USABLE.
Copyright (C) 2021 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */
#include <stdlib.h>
#include "tst-ifunc-isa.h"
static int
do_test (void)
{
enum isa value = foo ();
enum isa expected = get_isa ();
return value == expected ? EXIT_SUCCESS : EXIT_FAILURE;
}
#include <support/test-driver.c>

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@ -0,0 +1 @@
#include "tst-ifunc-isa-2.c"

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@ -0,0 +1,34 @@
/* Check IFUNC resolver with CPU_FEATURE_USABLE and tunables.
Copyright (C) 2021 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */
#include <stdlib.h>
#include "tst-ifunc-isa.h"
#include <support/test-driver.h>
static int
do_test (void)
{
/* CPU must support SSE2. */
if (!__builtin_cpu_supports ("sse2"))
return EXIT_UNSUPPORTED;
enum isa value = foo ();
/* All ISAs, but SSE2, are disabled by tunables. */
return value == sse2 ? EXIT_SUCCESS : EXIT_FAILURE;
}
#include <support/test-driver.c>

104
sysdeps/x86/tst-ifunc-isa.h Normal file
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@ -0,0 +1,104 @@
/* IFUNC resolver with CPU_FEATURE_USABLE.
Copyright (C) 2021 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */
#include <sys/platform/x86.h>
enum isa
{
none,
sse2,
sse4_2,
avx,
avx2,
avx512f
};
enum isa
get_isa (void)
{
if (CPU_FEATURE_USABLE (AVX512F))
return avx512f;
if (CPU_FEATURE_USABLE (AVX2))
return avx2;
if (CPU_FEATURE_USABLE (AVX))
return avx;
if (CPU_FEATURE_USABLE (SSE4_2))
return sse4_2;
if (CPU_FEATURE_USABLE (SSE2))
return sse2;
return none;
}
static int
isa_sse2 (void)
{
return sse2;
}
static int
isa_sse4_2 (void)
{
return sse4_2;
}
static int
isa_avx (void)
{
return avx;
}
static int
isa_avx2 (void)
{
return avx2;
}
static int
isa_avx512f (void)
{
return avx512f;
}
static int
isa_none (void)
{
return none;
}
int foo (void) __attribute__ ((ifunc ("foo_ifunc")));
void *
foo_ifunc (void)
{
switch (get_isa ())
{
case avx512f:
return isa_avx512f;
case avx2:
return isa_avx2;
case avx:
return isa_avx;
case sse4_2:
return isa_sse4_2;
case sse2:
return isa_sse2;
default:
break;
}
return isa_none;
}