aboutsummaryrefslogtreecommitdiff
path: root/sysdeps/x86
diff options
context:
space:
mode:
Diffstat (limited to 'sysdeps/x86')
-rw-r--r--sysdeps/x86/Makefile7
-rw-r--r--sysdeps/x86/cpu-features.c38
-rw-r--r--sysdeps/x86/cpu-features.h6
-rw-r--r--sysdeps/x86/tst-get-cpu-features.c2
-rw-r--r--sysdeps/x86/tst-strncmp-rtm.c43
-rw-r--r--sysdeps/x86/tst-wcsncmp-rtm.c21
6 files changed, 101 insertions, 16 deletions
diff --git a/sysdeps/x86/Makefile b/sysdeps/x86/Makefile
index e821d95..ced664f 100644
--- a/sysdeps/x86/Makefile
+++ b/sysdeps/x86/Makefile
@@ -33,7 +33,9 @@ tests += \
tst-strcpy-rtm \
tst-strlen-rtm \
tst-strncmp-rtm \
- tst-strrchr-rtm
+ tst-strrchr-rtm \
+ tst-wcsncmp-rtm \
+# tests
CFLAGS-tst-memchr-rtm.c += -mrtm
CFLAGS-tst-memcmp-rtm.c += -mrtm
@@ -43,8 +45,9 @@ CFLAGS-tst-memset-rtm.c += -mrtm
CFLAGS-tst-strchr-rtm.c += -mrtm
CFLAGS-tst-strcpy-rtm.c += -mrtm
CFLAGS-tst-strlen-rtm.c += -mrtm
-CFLAGS-tst-strncmp-rtm.c += -mrtm
+CFLAGS-tst-strncmp-rtm.c += -mrtm -Wno-error
CFLAGS-tst-strrchr-rtm.c += -mrtm
+CFLAGS-tst-wcsncmp-rtm.c += -mrtm -Wno-error
endif
ifneq ($(enable-cet),no)
diff --git a/sysdeps/x86/cpu-features.c b/sysdeps/x86/cpu-features.c
index eb554b6..484efe7 100644
--- a/sysdeps/x86/cpu-features.c
+++ b/sysdeps/x86/cpu-features.c
@@ -71,7 +71,6 @@ update_usable (struct cpu_features *cpu_features)
CPU_FEATURE_UNSET (cpu_features, INDEX_7_EDX_6);
CPU_FEATURE_UNSET (cpu_features, INDEX_7_EDX_7);
CPU_FEATURE_UNSET (cpu_features, INDEX_7_EDX_9);
- CPU_FEATURE_UNSET (cpu_features, INDEX_7_EDX_11);
CPU_FEATURE_UNSET (cpu_features, INDEX_7_EDX_12);
CPU_FEATURE_UNSET (cpu_features, INDEX_7_EDX_13);
CPU_FEATURE_UNSET (cpu_features, INDEX_7_EDX_17);
@@ -318,6 +317,9 @@ update_usable (struct cpu_features *cpu_features)
/* Determine if PKU is usable. */
if (CPU_FEATURES_CPU_P (cpu_features, OSPKE))
CPU_FEATURE_SET (cpu_features, PKU);
+
+ if (CPU_FEATURES_CPU_P (cpu_features, RTM_ALWAYS_ABORT))
+ CPU_FEATURE_UNSET (cpu_features, RTM);
}
static void
@@ -516,11 +518,39 @@ init_cpu_features (struct cpu_features *cpu_features)
break;
}
- /* Disable TSX on some Haswell processors to avoid TSX on kernels that
- weren't updated with the latest microcode package (which disables
- broken feature by default). */
+ /* Disable TSX on some processors to avoid TSX on kernels that
+ weren't updated with the latest microcode package (which
+ disables broken feature by default). */
switch (model)
{
+ case 0x55:
+ if (stepping <= 5)
+ goto disable_tsx;
+ break;
+ case 0x8e:
+ /* NB: Although the errata documents that for model == 0x8e,
+ only 0xb stepping or lower are impacted, the intention of
+ the errata was to disable TSX on all client processors on
+ all steppings. Include 0xc stepping which is an Intel
+ Core i7-8665U, a client mobile processor. */
+ case 0x9e:
+ if (stepping > 0xc)
+ break;
+ /* Fall through. */
+ case 0x4e:
+ case 0x5e:
+ {
+ /* Disable Intel TSX and enable RTM_ALWAYS_ABORT for
+ processors listed in:
+
+https://www.intel.com/content/www/us/en/support/articles/000059422/processors.html
+ */
+disable_tsx:
+ CPU_FEATURE_UNSET (cpu_features, HLE);
+ CPU_FEATURE_UNSET (cpu_features, RTM);
+ CPU_FEATURE_SET (cpu_features, RTM_ALWAYS_ABORT);
+ }
+ break;
case 0x3f:
/* Xeon E7 v3 with stepping >= 4 has working TSX. */
if (stepping >= 4)
diff --git a/sysdeps/x86/cpu-features.h b/sysdeps/x86/cpu-features.h
index 72ea74d..8995a15 100644
--- a/sysdeps/x86/cpu-features.h
+++ b/sysdeps/x86/cpu-features.h
@@ -295,7 +295,7 @@ extern const struct cpu_features *__get_cpu_features (void)
#define bit_cpu_AVX512_VP2INTERSECT (1u << 8)
#define bit_cpu_INDEX_7_EDX_9 (1u << 9)
#define bit_cpu_MD_CLEAR (1u << 10)
-#define bit_cpu_INDEX_7_EDX_11 (1u << 11)
+#define bit_cpu_RTM_ALWAYS_ABORT (1u << 11)
#define bit_cpu_INDEX_7_EDX_12 (1u << 12)
#define bit_cpu_INDEX_7_EDX_13 (1u << 13)
#define bit_cpu_SERIALIZE (1u << 14)
@@ -508,7 +508,7 @@ extern const struct cpu_features *__get_cpu_features (void)
#define index_cpu_AVX512_VP2INTERSECT COMMON_CPUID_INDEX_7
#define index_cpu_INDEX_7_EDX_9 COMMON_CPUID_INDEX_7
#define index_cpu_MD_CLEAR COMMON_CPUID_INDEX_7
-#define index_cpu_INDEX_7_EDX_11 COMMON_CPUID_INDEX_7
+#define index_cpu_RTM_ALWAYS_ABORT COMMON_CPUID_INDEX_7
#define index_cpu_INDEX_7_EDX_12 COMMON_CPUID_INDEX_7
#define index_cpu_INDEX_7_EDX_13 COMMON_CPUID_INDEX_7
#define index_cpu_SERIALIZE COMMON_CPUID_INDEX_7
@@ -721,7 +721,7 @@ extern const struct cpu_features *__get_cpu_features (void)
#define reg_AVX512_VP2INTERSECT edx
#define reg_INDEX_7_EDX_9 edx
#define reg_MD_CLEAR edx
-#define reg_INDEX_7_EDX_11 edx
+#define reg_RTM_ALWAYS_ABORT edx
#define reg_INDEX_7_EDX_12 edx
#define reg_INDEX_7_EDX_13 edx
#define reg_SERIALIZE edx
diff --git a/sysdeps/x86/tst-get-cpu-features.c b/sysdeps/x86/tst-get-cpu-features.c
index 080c58e7..527de3b 100644
--- a/sysdeps/x86/tst-get-cpu-features.c
+++ b/sysdeps/x86/tst-get-cpu-features.c
@@ -183,6 +183,7 @@ do_test (void)
CHECK_CPU_FEATURE (FSRM);
CHECK_CPU_FEATURE (AVX512_VP2INTERSECT);
CHECK_CPU_FEATURE (MD_CLEAR);
+ CHECK_CPU_FEATURE (RTM_ALWAYS_ABORT);
CHECK_CPU_FEATURE (SERIALIZE);
CHECK_CPU_FEATURE (HYBRID);
CHECK_CPU_FEATURE (TSXLDTRK);
@@ -336,6 +337,7 @@ do_test (void)
CHECK_CPU_FEATURE_USABLE (FSRM);
CHECK_CPU_FEATURE_USABLE (AVX512_VP2INTERSECT);
CHECK_CPU_FEATURE_USABLE (MD_CLEAR);
+ CHECK_CPU_FEATURE_USABLE (RTM_ALWAYS_ABORT);
CHECK_CPU_FEATURE_USABLE (SERIALIZE);
CHECK_CPU_FEATURE_USABLE (HYBRID);
CHECK_CPU_FEATURE_USABLE (TSXLDTRK);
diff --git a/sysdeps/x86/tst-strncmp-rtm.c b/sysdeps/x86/tst-strncmp-rtm.c
index 236ad95..aef9866 100644
--- a/sysdeps/x86/tst-strncmp-rtm.c
+++ b/sysdeps/x86/tst-strncmp-rtm.c
@@ -16,20 +16,35 @@
License along with the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */
+#include <stdint.h>
#include <tst-string-rtm.h>
+#ifdef WIDE
+# define CHAR wchar_t
+# define MEMSET wmemset
+# define STRNCMP wcsncmp
+# define TEST_NAME "wcsncmp"
+#else /* !WIDE */
+# define CHAR char
+# define MEMSET memset
+# define STRNCMP strncmp
+# define TEST_NAME "strncmp"
+#endif /* !WIDE */
+
+
+
#define LOOP 3000
#define STRING_SIZE 1024
-char string1[STRING_SIZE];
-char string2[STRING_SIZE];
+CHAR string1[STRING_SIZE];
+CHAR string2[STRING_SIZE];
__attribute__ ((noinline, noclone))
static int
prepare (void)
{
- memset (string1, 'a', STRING_SIZE - 1);
- memset (string2, 'a', STRING_SIZE - 1);
- if (strncmp (string1, string2, STRING_SIZE) == 0)
+ MEMSET (string1, 'a', STRING_SIZE - 1);
+ MEMSET (string2, 'a', STRING_SIZE - 1);
+ if (STRNCMP (string1, string2, STRING_SIZE) == 0)
return EXIT_SUCCESS;
else
return EXIT_FAILURE;
@@ -39,7 +54,17 @@ __attribute__ ((noinline, noclone))
static int
function (void)
{
- if (strncmp (string1, string2, STRING_SIZE) == 0)
+ if (STRNCMP (string1, string2, STRING_SIZE) == 0)
+ return 0;
+ else
+ return 1;
+}
+
+__attribute__ ((noinline, noclone))
+static int
+function_overflow (void)
+{
+ if (STRNCMP (string1, string2, SIZE_MAX) == 0)
return 0;
else
return 1;
@@ -48,5 +73,9 @@ function (void)
static int
do_test (void)
{
- return do_test_1 ("strncmp", LOOP, prepare, function);
+ int status = do_test_1 (TEST_NAME, LOOP, prepare, function);
+ if (status != EXIT_SUCCESS)
+ return status;
+ status = do_test_1 (TEST_NAME, LOOP, prepare, function_overflow);
+ return status;
}
diff --git a/sysdeps/x86/tst-wcsncmp-rtm.c b/sysdeps/x86/tst-wcsncmp-rtm.c
new file mode 100644
index 0000000..bad3b86
--- /dev/null
+++ b/sysdeps/x86/tst-wcsncmp-rtm.c
@@ -0,0 +1,21 @@
+/* Test case for wcsncmp inside a transactionally executing RTM region.
+ Copyright (C) 2022 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/>. */
+
+#define WIDE 1
+#include <wchar.h>
+#include "tst-strncmp-rtm.c"
generated by cgit v1.1 at 2025-02-17 12:06:10 +0000