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x86: Add x86-64-vN check to early startup

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This ISA level covers the glibc build itself.  <dl-hwcap-check.h>
cannot be used because this check (by design) happens before
DL_PLATFORM_INIT and the x86 CPU flags initialization.

Reviewed-by: H.J. Lu <hjl.tools@gmail.com>
This commit is contained in:
Florian Weimer
2022-01-14 20:16:05 +01:00
parent 5501164866
commit 990c953bce
2 changed files with 31 additions and 1 deletions
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1
sysdeps/x86/Makefile
View File

@@ -7,6 +7,7 @@ sysdep_routines += get-cpuid-feature-leaf
sysdep-dl-routines += dl-get-cpu-features sysdep-dl-routines += dl-get-cpu-features
sysdep_headers += sys/platform/x86.h bits/platform/x86.h sysdep_headers += sys/platform/x86.h bits/platform/x86.h
CFLAGS-dl-get-cpu-features.os += $(rtld-early-cflags)
CFLAGS-get-cpuid-feature-leaf.o += $(no-stack-protector) CFLAGS-get-cpuid-feature-leaf.o += $(no-stack-protector)
tests += tst-get-cpu-features tst-get-cpu-features-static \ tests += tst-get-cpu-features tst-get-cpu-features-static \

31
sysdeps/x86/dl-get-cpu-features.c
View File

@@ -20,6 +20,7 @@
#ifdef SHARED #ifdef SHARED
# include <cpu-features.c> # include <cpu-features.c>
# include <gcc-macros.h>
/* NB: Normally, DL_PLATFORM_INIT calls init_cpu_features to initialize /* NB: Normally, DL_PLATFORM_INIT calls init_cpu_features to initialize
CPU features in dynamic executable. But when loading ld.so inside of CPU features in dynamic executable. But when loading ld.so inside of
@@ -36,7 +37,35 @@ _dl_x86_init_cpu_features (void)
{ {
struct cpu_features *cpu_features = __get_cpu_features (); struct cpu_features *cpu_features = __get_cpu_features ();
if (cpu_features->basic.kind == arch_kind_unknown) if (cpu_features->basic.kind == arch_kind_unknown)
init_cpu_features (cpu_features); {
init_cpu_features (cpu_features);
# if IS_IN (rtld)
/* See isa-level.c. */
# if defined GCCMACRO__GCC_HAVE_SYNC_COMPARE_AND_SWAP_16 \
&& defined HAVE_X86_LAHF_SAHF && defined GCCMACRO__POPCNT__ \
&& defined GCCMACRO__SSE3__ && defined GCCMACRO__SSSE3__ \
&& defined GCCMACRO__SSE4_1__ && defined GCCMACRO__SSE4_2__
if (!(cpu_features->isa_1 & GNU_PROPERTY_X86_ISA_1_V2))
_dl_fatal_printf ("\
Fatal glibc error: CPU does not support x86-64-v%d\n", 2);
# if defined GCCMACRO__AVX__ && defined GCCMACRO__AVX2__ \
&& defined GCCMACRO__F16C__ && defined GCCMACRO__FMA__ \
&& defined GCCMACRO__LZCNT__ && defined HAVE_X86_MOVBE
if (!(cpu_features->isa_1 & GNU_PROPERTY_X86_ISA_1_V3))
_dl_fatal_printf ("\
Fatal glibc error: CPU does not support x86-64-v%d\n", 3);
# if defined GCCMACRO__AVX512F__ && defined GCCMACRO__AVX512BW__ \
&& defined GCCMACRO__AVX512CD__ && defined GCCMACRO__AVX512DQ__ \
&& defined GCCMACRO__AVX512VL__
if (!(cpu_features->isa_1 & GNU_PROPERTY_X86_ISA_1_V4))
_dl_fatal_printf ("\
Fatal glibc error: CPU does not support x86-64-v%d\n", 4);
# endif /* ISA level 4 */
# endif /* ISA level 3 */
# endif /* ISA level 2 */
# endif /* IS_IN (rtld) */
}
} }
__ifunc (__x86_cpu_features, __x86_cpu_features, NULL, void, __ifunc (__x86_cpu_features, __x86_cpu_features, NULL, void,