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| author | H.J. Lu <hjl.tools@gmail.com> | 2017-06-22 08:51:42 -0700 |
|---|---|---|
| committer | H.J. Lu <hjl.tools@gmail.com> | 2017-08-13 07:31:11 -0700 |
| commit | 26bb65e293df8d6a042bf3d51d0a4d2f313f4eb5 (patch) | |
| tree | ba34137b735d7edd00e22d37213249ab1de66853 | |
| parent | 6bd5c7a0dedf99a48a5a91d008669f5e9d15ab2e (diff) | |
| download | glibc-hjl/cet/pr21598.tar.gz | |
x86: Add IBT/SHSTK bits to cpu-featureshjl/cet/pr21598
Add IBT/SHSTK bits to cpu-features for Shadow Stack in Intel Control-flow
Enforcement Technology (CET) instructions:
https://software.intel.com/sites/default/files/managed/4d/2a/control-flow-enforcement-technology-preview.pdf
* sysdeps/x86/cpu-features.h (bit_cpu_BIT): New.
(bit_cpu_SHSTK): Likewise.
(index_cpu_IBT): Likewise.
(index_cpu_SHSTK): Likewise.
(reg_IBT): Likewise.
(reg_SHSTK): Likewise.
* sysdeps/x86/cpu-tunables.c (TUNABLE_CALLBACK (set_hwcaps)):
Handle index_cpu_IBT and index_cpu_SHSTK.
| -rw-r--r-- | sysdeps/x86/cpu-features.h | 8 | ||||
| -rw-r--r-- | sysdeps/x86/cpu-tunables.c | 2 |
2 files changed, 10 insertions, 0 deletions
diff --git a/sysdeps/x86/cpu-features.h b/sysdeps/x86/cpu-features.h index af52689123..9733e6ee66 100644 --- a/sysdeps/x86/cpu-features.h +++ b/sysdeps/x86/cpu-features.h @@ -74,6 +74,8 @@ #define bit_cpu_AVX512CD (1 << 28) #define bit_cpu_AVX512BW (1 << 30) #define bit_cpu_AVX512VL (1u << 31) +#define bit_cpu_IBT (1u << 20) +#define bit_cpu_SHSTK (1u << 7) /* XCR0 Feature flags. */ #define bit_XMM_state (1 << 1) @@ -103,6 +105,8 @@ # define index_cpu_AVX2 COMMON_CPUID_INDEX_7*CPUID_SIZE+CPUID_EBX_OFFSET # define index_cpu_ERMS COMMON_CPUID_INDEX_7*CPUID_SIZE+CPUID_EBX_OFFSET # define index_cpu_MOVBE COMMON_CPUID_INDEX_1*CPUID_SIZE+CPUID_ECX_OFFSET +# define index_cpu_IBT COMMON_CPUID_INDEX_7*CPUID_SIZE+CPUID_EDX_OFFSET +# define index_cpu_SHSTK COMMON_CPUID_INDEX_7*CPUID_SIZE+CPUID_ECX_OFFSET # define index_arch_Fast_Rep_String FEATURE_INDEX_1*FEATURE_SIZE # define index_arch_Fast_Copy_Backward FEATURE_INDEX_1*FEATURE_SIZE @@ -220,6 +224,8 @@ extern const struct cpu_features *__get_cpu_features (void) # define index_cpu_LZCNT COMMON_CPUID_INDEX_1 # define index_cpu_MOVBE COMMON_CPUID_INDEX_1 # define index_cpu_POPCNT COMMON_CPUID_INDEX_1 +# define index_cpu_IBT COMMON_CPUID_INDEX_7 +# define index_cpu_SHSTK COMMON_CPUID_INDEX_7 # define reg_CX8 edx # define reg_CMOV edx @@ -249,6 +255,8 @@ extern const struct cpu_features *__get_cpu_features (void) # define reg_LZCNT ecx # define reg_MOVBE ecx # define reg_POPCNT ecx +# define reg_IBT edx +# define reg_SHSTK ecx # define index_arch_Fast_Rep_String FEATURE_INDEX_1 # define index_arch_Fast_Copy_Backward FEATURE_INDEX_1 diff --git a/sysdeps/x86/cpu-tunables.c b/sysdeps/x86/cpu-tunables.c index 872dd1267f..0ab708cca8 100644 --- a/sysdeps/x86/cpu-tunables.c +++ b/sysdeps/x86/cpu-tunables.c @@ -164,6 +164,7 @@ TUNABLE_CALLBACK (set_hwcaps) (tunable_val_t *valp) CHECK_GLIBC_IFUNC_CPU_OFF (n, cpu_features, CX8, 3); CHECK_GLIBC_IFUNC_CPU_OFF (n, cpu_features, FMA, 3); CHECK_GLIBC_IFUNC_CPU_OFF (n, cpu_features, HTT, 3); + CHECK_GLIBC_IFUNC_CPU_OFF (n, cpu_features, IBT, 3); CHECK_GLIBC_IFUNC_CPU_OFF (n, cpu_features, RTM, 3); } break; @@ -186,6 +187,7 @@ TUNABLE_CALLBACK (set_hwcaps) (tunable_val_t *valp) { CHECK_GLIBC_IFUNC_CPU_OFF (n, cpu_features, LZCNT, 5); CHECK_GLIBC_IFUNC_CPU_OFF (n, cpu_features, MOVBE, 5); + CHECK_GLIBC_IFUNC_CPU_OFF (n, cpu_features, SHSTK, 5); CHECK_GLIBC_IFUNC_CPU_OFF (n, cpu_features, SSSE3, 5); } break; |