diff options
Diffstat (limited to 'sysdeps/x86/dl-get-cpu-features.c')
| -rw-r--r-- | sysdeps/x86/dl-get-cpu-features.c | 27 |
1 files changed, 26 insertions, 1 deletions
diff --git a/sysdeps/x86/dl-get-cpu-features.c b/sysdeps/x86/dl-get-cpu-features.c index 5f9e46b0c6..349472d99f 100644 --- a/sysdeps/x86/dl-get-cpu-features.c +++ b/sysdeps/x86/dl-get-cpu-features.c @@ -1,4 +1,4 @@ -/* This file is part of the GNU C Library. +/* Initialize CPU feature data via IFUNC relocation. Copyright (C) 2015-2020 Free Software Foundation, Inc. The GNU C Library is free software; you can redistribute it and/or @@ -18,6 +18,31 @@ #include <ldsodefs.h> +#ifdef SHARED +# include <cpu-features.c> + +/* NB: Normally, DL_PLATFORM_INIT calls init_cpu_features to initialize + CPU features in dynamic executable. But when loading ld.so inside of + static executable, DL_PLATFORM_INIT isn't called and IFUNC relocation + is used to call init_cpu_features. In static executable, it is called + once by IFUNC relocation. In dynamic executable, it is called twice + by DL_PLATFORM_INIT and by IFUNC relocation. */ +extern void __x86_cpu_features (void) attribute_hidden; +const void (*__x86_cpu_features_p) (void) attribute_hidden + = __x86_cpu_features; + +void +_dl_x86_init_cpu_features (void) +{ + struct cpu_features *cpu_features = __get_cpu_features (); + if (cpu_features->basic.kind == arch_kind_unknown) + init_cpu_features (cpu_features); +} + +__ifunc (__x86_cpu_features, __x86_cpu_features, NULL, void, + _dl_x86_init_cpu_features); +#endif + #undef __x86_get_cpu_features const struct cpu_features * |