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commit 990c953bce06d77360d2e933faa9a008e2c55405
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Author: Florian Weimer <fweimer@redhat.com>
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Date: Fri Jan 14 20:16:05 2022 +0100
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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>
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cannot be used because this check (by design) happens before
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DL_PLATFORM_INIT and the x86 CPU flags initialization.
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Reviewed-by: H.J. Lu <hjl.tools@gmail.com>
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diff --git a/sysdeps/x86/Makefile b/sysdeps/x86/Makefile
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index 5ee06f94735e5189..36ca1a7126047b86 100644
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--- a/sysdeps/x86/Makefile
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+++ b/sysdeps/x86/Makefile
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@@ -7,6 +7,7 @@ sysdep_routines += get-cpuid-feature-leaf
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sysdep-dl-routines += dl-get-cpu-features
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sysdep_headers += sys/platform/x86.h bits/platform/x86.h
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+CFLAGS-dl-get-cpu-features.os += $(rtld-early-cflags)
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CFLAGS-get-cpuid-feature-leaf.o += $(no-stack-protector)
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tests += tst-get-cpu-features tst-get-cpu-features-static \
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diff --git a/sysdeps/x86/dl-get-cpu-features.c b/sysdeps/x86/dl-get-cpu-features.c
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index 839803c746f408ed..6ccde4404b13a725 100644
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--- a/sysdeps/x86/dl-get-cpu-features.c
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+++ b/sysdeps/x86/dl-get-cpu-features.c
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@@ -20,6 +20,7 @@
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#ifdef SHARED
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# include <cpu-features.c>
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+# include <gcc-macros.h>
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/* NB: Normally, DL_PLATFORM_INIT calls init_cpu_features to initialize
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CPU features in dynamic executable. But when loading ld.so inside of
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@@ -36,7 +37,35 @@ _dl_x86_init_cpu_features (void)
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{
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struct cpu_features *cpu_features = __get_cpu_features ();
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if (cpu_features->basic.kind == arch_kind_unknown)
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- init_cpu_features (cpu_features);
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+ {
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+ init_cpu_features (cpu_features);
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+
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+# if IS_IN (rtld)
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+ /* See isa-level.c. */
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+# if defined GCCMACRO__GCC_HAVE_SYNC_COMPARE_AND_SWAP_16 \
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+ && defined HAVE_X86_LAHF_SAHF && defined GCCMACRO__POPCNT__ \
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+ && defined GCCMACRO__SSE3__ && defined GCCMACRO__SSSE3__ \
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+ && defined GCCMACRO__SSE4_1__ && defined GCCMACRO__SSE4_2__
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+ if (!(cpu_features->isa_1 & GNU_PROPERTY_X86_ISA_1_V2))
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+ _dl_fatal_printf ("\
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+Fatal glibc error: CPU does not support x86-64-v%d\n", 2);
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+# if defined GCCMACRO__AVX__ && defined GCCMACRO__AVX2__ \
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+ && defined GCCMACRO__F16C__ && defined GCCMACRO__FMA__ \
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+ && defined GCCMACRO__LZCNT__ && defined HAVE_X86_MOVBE
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+ if (!(cpu_features->isa_1 & GNU_PROPERTY_X86_ISA_1_V3))
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+ _dl_fatal_printf ("\
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+Fatal glibc error: CPU does not support x86-64-v%d\n", 3);
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+# if defined GCCMACRO__AVX512F__ && defined GCCMACRO__AVX512BW__ \
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+ && defined GCCMACRO__AVX512CD__ && defined GCCMACRO__AVX512DQ__ \
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+ && defined GCCMACRO__AVX512VL__
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+ if (!(cpu_features->isa_1 & GNU_PROPERTY_X86_ISA_1_V4))
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+ _dl_fatal_printf ("\
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+Fatal glibc error: CPU does not support x86-64-v%d\n", 4);
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+# endif /* ISA level 4 */
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+# endif /* ISA level 3 */
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+# endif /* ISA level 2 */
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+# endif /* IS_IN (rtld) */
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+ }
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}
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__ifunc (__x86_cpu_features, __x86_cpu_features, NULL, void,
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