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-rw-r--r--sysdeps/x86/Makefile7
-rw-r--r--sysdeps/x86/cpu-features.c40
-rw-r--r--sysdeps/x86/cpu-features.h3
-rw-r--r--sysdeps/x86/tst-get-cpu-features.c1
-rw-r--r--sysdeps/x86/tst-strncmp-rtm.c43
-rw-r--r--sysdeps/x86/tst-wcsncmp-rtm.c21
6 files changed, 103 insertions, 12 deletions
diff --git a/sysdeps/x86/Makefile b/sysdeps/x86/Makefile
index a93139b790..b7aec5df2b 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
 
 ifeq ($(enable-cet),yes)
diff --git a/sysdeps/x86/cpu-features.c b/sysdeps/x86/cpu-features.c
index a4d1eacbe7..91215f8e23 100644
--- a/sysdeps/x86/cpu-features.c
+++ b/sysdeps/x86/cpu-features.c
@@ -333,6 +333,9 @@ init_cpu_features (struct cpu_features *cpu_features)
 
       get_extended_indices (cpu_features);
 
+      if (CPU_FEATURES_CPU_P (cpu_features, RTM_ALWAYS_ABORT))
+	cpu_features->cpuid[index_cpu_RTM].reg_RTM &= ~bit_cpu_RTM;
+
       if (family == 0x06)
 	{
 	  model += extended_model;
@@ -394,11 +397,42 @@ 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_features->cpuid[index_cpu_HLE].reg_HLE
+		  &= ~bit_cpu_HLE;
+		cpu_features->cpuid[index_cpu_RTM].reg_RTM
+		  &= ~bit_cpu_RTM;
+		cpu_features->cpuid[index_cpu_RTM_ALWAYS_ABORT].reg_RTM_ALWAYS_ABORT
+		  |= bit_cpu_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 ca2924bd95..3599dd89d0 100644
--- a/sysdeps/x86/cpu-features.h
+++ b/sysdeps/x86/cpu-features.h
@@ -499,6 +499,7 @@ extern const struct cpu_features *__get_cpu_features (void)
 #define bit_cpu_AVX512_4VNNIW	(1u << 2)
 #define bit_cpu_AVX512_4FMAPS	(1u << 3)
 #define bit_cpu_FSRM		(1u << 4)
+#define bit_cpu_RTM_ALWAYS_ABORT (1u << 11)
 #define bit_cpu_PCONFIG		(1u << 18)
 #define bit_cpu_IBT		(1u << 20)
 #define bit_cpu_IBRS_IBPB	(1u << 26)
@@ -667,6 +668,7 @@ extern const struct cpu_features *__get_cpu_features (void)
 #define index_cpu_AVX512_4VNNIW COMMON_CPUID_INDEX_7
 #define index_cpu_AVX512_4FMAPS	COMMON_CPUID_INDEX_7
 #define index_cpu_FSRM		COMMON_CPUID_INDEX_7
+#define index_cpu_RTM_ALWAYS_ABORT COMMON_CPUID_INDEX_7
 #define index_cpu_PCONFIG	COMMON_CPUID_INDEX_7
 #define index_cpu_IBT		COMMON_CPUID_INDEX_7
 #define index_cpu_IBRS_IBPB	COMMON_CPUID_INDEX_7
@@ -835,6 +837,7 @@ extern const struct cpu_features *__get_cpu_features (void)
 #define reg_AVX512_4VNNIW	edx
 #define reg_AVX512_4FMAPS	edx
 #define reg_FSRM		edx
+#define reg_RTM_ALWAYS_ABORT	edx
 #define reg_PCONFIG		edx
 #define reg_IBT			edx
 #define reg_IBRS_IBPB		edx
diff --git a/sysdeps/x86/tst-get-cpu-features.c b/sysdeps/x86/tst-get-cpu-features.c
index bf2b9b22e7..08aa421fe9 100644
--- a/sysdeps/x86/tst-get-cpu-features.c
+++ b/sysdeps/x86/tst-get-cpu-features.c
@@ -176,6 +176,7 @@ do_test (void)
   CHECK_CPU_FEATURE (AVX512_4VNNIW);
   CHECK_CPU_FEATURE (AVX512_4FMAPS);
   CHECK_CPU_FEATURE (FSRM);
+  CHECK_CPU_FEATURE (RTM_ALWAYS_ABORT);
   CHECK_CPU_FEATURE (PCONFIG);
   CHECK_CPU_FEATURE (IBT);
   CHECK_CPU_FEATURE (IBRS_IBPB);
diff --git a/sysdeps/x86/tst-strncmp-rtm.c b/sysdeps/x86/tst-strncmp-rtm.c
index 236ad951b5..aef9866cf2 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 0000000000..bad3b86378
--- /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-pink 1.4.1 (git 2.36.1) at 2024-06-12 18:56:45 +0000