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base/SOURCES/glibc-rh1292018-1.patch

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We add back Prefer_SSE_for_memop since we still need it for all of the
existing era implementations for RHEL 7.3. To remove it would require
a more wholesale backport of optmized routines.
commit e2e4f56056adddc3c1efe676b40a4b4f2453103b
Author: H.J. Lu <hjl.tools@gmail.com>
Date: Thu Aug 13 03:37:47 2015 -0700
Add _dl_x86_cpu_features to rtld_global
This patch adds _dl_x86_cpu_features to rtld_global in x86 ld.so
and initializes it early before __libc_start_main is called so that
cpu_features is always available when it is used and we can avoid
calling __init_cpu_features in IFUNC selectors.
Index: glibc-2.17-c758a686/sysdeps/i386/dl-machine.h
===================================================================
--- glibc-2.17-c758a686.orig/sysdeps/i386/dl-machine.h
+++ glibc-2.17-c758a686/sysdeps/i386/dl-machine.h
@@ -25,6 +25,7 @@
#include <sysdep.h>
#include <tls.h>
#include <dl-tlsdesc.h>
+#include <cpu-features.c>
/* Return nonzero iff ELF header is compatible with the running host. */
static inline int __attribute__ ((unused))
@@ -266,6 +267,8 @@ dl_platform_init (void)
if (GLRO(dl_platform) != NULL && *GLRO(dl_platform) == '\0')
/* Avoid an empty string which would disturb us. */
GLRO(dl_platform) = NULL;
+
+ init_cpu_features (&GLRO(dl_x86_cpu_features));
}
static inline Elf32_Addr
Index: glibc-2.17-c758a686/sysdeps/i386/dl-procinfo.c
===================================================================
--- glibc-2.17-c758a686.orig/sysdeps/i386/dl-procinfo.c
+++ glibc-2.17-c758a686/sysdeps/i386/dl-procinfo.c
@@ -43,6 +43,22 @@
# define PROCINFO_CLASS
#endif
+#if !IS_IN (ldconfig)
+# if !defined PROCINFO_DECL && defined SHARED
+ ._dl_x86_cpu_features
+# else
+PROCINFO_CLASS struct cpu_features _dl_x86_cpu_features
+# endif
+# ifndef PROCINFO_DECL
+= { }
+# endif
+# if !defined SHARED || defined PROCINFO_DECL
+;
+# else
+,
+# endif
+#endif
+
#if !defined PROCINFO_DECL && defined SHARED
._dl_x86_cap_flags
#else
Index: glibc-2.17-c758a686/sysdeps/i386/i686/cacheinfo.c
===================================================================
--- glibc-2.17-c758a686.orig/sysdeps/i386/i686/cacheinfo.c
+++ glibc-2.17-c758a686/sysdeps/i386/i686/cacheinfo.c
@@ -8,6 +8,5 @@
#define __x86_64_raw_shared_cache_size_half __x86_raw_shared_cache_size_half
#define DISABLE_PREFETCHW
-#define DISABLE_PREFERRED_MEMORY_INSTRUCTION
#include <sysdeps/x86_64/cacheinfo.c>
Index: glibc-2.17-c758a686/sysdeps/i386/i686/multiarch/Makefile
===================================================================
--- glibc-2.17-c758a686.orig/sysdeps/i386/i686/multiarch/Makefile
+++ glibc-2.17-c758a686/sysdeps/i386/i686/multiarch/Makefile
@@ -1,5 +1,4 @@
ifeq ($(subdir),csu)
-aux += init-arch
tests += test-multiarch
gen-as-const-headers += ifunc-defines.sym
endif
Index: glibc-2.17-c758a686/sysdeps/i386/i686/multiarch/Versions
===================================================================
--- glibc-2.17-c758a686.orig/sysdeps/i386/i686/multiarch/Versions
+++ /dev/null
@@ -1,5 +0,0 @@
-libc {
- GLIBC_PRIVATE {
- __get_cpu_features;
- }
-}
Index: glibc-2.17-c758a686/sysdeps/i386/i686/multiarch/ifunc-defines.sym
===================================================================
--- glibc-2.17-c758a686.orig/sysdeps/i386/i686/multiarch/ifunc-defines.sym
+++ glibc-2.17-c758a686/sysdeps/i386/i686/multiarch/ifunc-defines.sym
@@ -4,7 +4,6 @@
--
CPU_FEATURES_SIZE sizeof (struct cpu_features)
-KIND_OFFSET offsetof (struct cpu_features, kind)
CPUID_OFFSET offsetof (struct cpu_features, cpuid)
CPUID_SIZE sizeof (struct cpuid_registers)
CPUID_EAX_OFFSET offsetof (struct cpuid_registers, eax)
Index: glibc-2.17-c758a686/sysdeps/i386/ldsodefs.h
===================================================================
--- glibc-2.17-c758a686.orig/sysdeps/i386/ldsodefs.h
+++ glibc-2.17-c758a686/sysdeps/i386/ldsodefs.h
@@ -20,6 +20,7 @@
#define _I386_LDSODEFS_H 1
#include <elf.h>
+#include <cpu-features.h>
struct La_i86_regs;
struct La_i86_retval;
Index: glibc-2.17-c758a686/sysdeps/unix/sysv/linux/x86_64/dl-procinfo.c
===================================================================
--- glibc-2.17-c758a686.orig/sysdeps/unix/sysv/linux/x86_64/dl-procinfo.c
+++ glibc-2.17-c758a686/sysdeps/unix/sysv/linux/x86_64/dl-procinfo.c
@@ -1,5 +1,5 @@
#if IS_IN (ldconfig)
# include <sysdeps/i386/dl-procinfo.c>
#else
-# include <sysdeps/generic/dl-procinfo.c>
+# include <sysdeps/x86_64/dl-procinfo.c>
#endif
Index: glibc-2.17-c758a686/sysdeps/x86/Makefile
===================================================================
--- glibc-2.17-c758a686.orig/sysdeps/x86/Makefile
+++ glibc-2.17-c758a686/sysdeps/x86/Makefile
@@ -7,3 +7,14 @@ $(objpfx)tst-xmmymmzmm.out: ../sysdeps/x
@echo "Checking ld.so for SSE register use. This will take a few seconds..."
$(SHELL) $< $(objpfx) '$(NM)' '$(OBJDUMP)' '$(READELF)' > $@
endif
+
+ifeq ($(subdir),csu)
+gen-as-const-headers += cpu-features-offsets.sym rtld-global-offsets.sym
+endif
+
+ifeq ($(subdir),elf)
+sysdep-dl-routines += dl-get-cpu-features
+
+tests += tst-get-cpu-features
+tests-static += tst-get-cpu-features-static
+endif
Index: glibc-2.17-c758a686/sysdeps/x86/Versions
===================================================================
--- /dev/null
+++ glibc-2.17-c758a686/sysdeps/x86/Versions
@@ -0,0 +1,5 @@
+ld {
+ GLIBC_PRIVATE {
+ __get_cpu_features;
+ }
+}
Index: glibc-2.17-c758a686/sysdeps/x86/cpu-features-offsets.sym
===================================================================
--- /dev/null
+++ glibc-2.17-c758a686/sysdeps/x86/cpu-features-offsets.sym
@@ -0,0 +1,7 @@
+#define SHARED 1
+
+#include <ldsodefs.h>
+
+#define rtld_global_ro_offsetof(mem) offsetof (struct rtld_global_ro, mem)
+
+RTLD_GLOBAL_RO_DL_X86_CPU_FEATURES_OFFSET rtld_global_ro_offsetof (_dl_x86_cpu_features)
Index: glibc-2.17-c758a686/sysdeps/x86/cpu-features.c
===================================================================
--- /dev/null
+++ glibc-2.17-c758a686/sysdeps/x86/cpu-features.c
@@ -0,0 +1,213 @@
+/* Initialize CPU feature data.
+ This file is part of the GNU C Library.
+ Copyright (C) 2008-2015 Free Software Foundation, Inc.
+
+ 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
+ <http://www.gnu.org/licenses/>. */
+
+#include <cpuid.h>
+#include <cpu-features.h>
+
+static inline void
+get_common_indeces (struct cpu_features *cpu_features,
+ unsigned int *family, unsigned int *model)
+{
+ unsigned int eax;
+ __cpuid (1, eax, cpu_features->cpuid[COMMON_CPUID_INDEX_1].ebx,
+ cpu_features->cpuid[COMMON_CPUID_INDEX_1].ecx,
+ cpu_features->cpuid[COMMON_CPUID_INDEX_1].edx);
+ GLRO(dl_x86_cpu_features).cpuid[COMMON_CPUID_INDEX_1].eax = eax;
+ *family = (eax >> 8) & 0x0f;
+ *model = (eax >> 4) & 0x0f;
+}
+
+static inline void
+init_cpu_features (struct cpu_features *cpu_features)
+{
+ unsigned int ebx, ecx, edx;
+ unsigned int family = 0;
+ unsigned int model = 0;
+ enum cpu_features_kind kind;
+
+ __cpuid (0, cpu_features->max_cpuid, ebx, ecx, edx);
+
+ /* This spells out "GenuineIntel". */
+ if (ebx == 0x756e6547 && ecx == 0x6c65746e && edx == 0x49656e69)
+ {
+ kind = arch_kind_intel;
+
+ get_common_indeces (cpu_features, &family, &model);
+
+ /* Intel processors prefer SSE instruction for memory/string
+ routines if they are available. */
+ cpu_features->feature[index_Prefer_SSE_for_memop]
+ |= bit_Prefer_SSE_for_memop;
+
+ unsigned int eax = cpu_features->cpuid[COMMON_CPUID_INDEX_1].eax;
+ unsigned int extended_family = (eax >> 20) & 0xff;
+ unsigned int extended_model = (eax >> 12) & 0xf0;
+ if (family == 0x0f)
+ {
+ family += extended_family;
+ model += extended_model;
+ }
+ else if (family == 0x06)
+ {
+ ecx = cpu_features->cpuid[COMMON_CPUID_INDEX_1].ecx;
+ model += extended_model;
+ switch (model)
+ {
+ case 0x1c:
+ case 0x26:
+ /* BSF is slow on Atom. */
+ cpu_features->feature[index_Slow_BSF] |= bit_Slow_BSF;
+ break;
+
+ case 0x37:
+ case 0x4a:
+ case 0x4d:
+ case 0x5a:
+ case 0x5d:
+ /* Unaligned load versions are faster than SSSE3
+ on Silvermont. */
+#if index_Fast_Unaligned_Load != index_Prefer_PMINUB_for_stringop
+# error index_Fast_Unaligned_Load != index_Prefer_PMINUB_for_stringop
+#endif
+#if index_Fast_Unaligned_Load != index_Slow_SSE4_2
+# error index_Fast_Unaligned_Load != index_Slow_SSE4_2
+#endif
+ cpu_features->feature[index_Fast_Unaligned_Load]
+ |= (bit_Fast_Unaligned_Load
+ | bit_Prefer_PMINUB_for_stringop
+ | bit_Slow_SSE4_2);
+ break;
+
+ default:
+ /* Unknown family 0x06 processors. Assuming this is one
+ of Core i3/i5/i7 processors if AVX is available. */
+ if ((ecx & bit_AVX) == 0)
+ break;
+
+ case 0x1a:
+ case 0x1e:
+ case 0x1f:
+ case 0x25:
+ case 0x2c:
+ case 0x2e:
+ case 0x2f:
+ /* Rep string instructions, copy backward, unaligned loads
+ and pminub are fast on Intel Core i3, i5 and i7. */
+#if index_Fast_Rep_String != index_Fast_Copy_Backward
+# error index_Fast_Rep_String != index_Fast_Copy_Backward
+#endif
+#if index_Fast_Rep_String != index_Fast_Unaligned_Load
+# error index_Fast_Rep_String != index_Fast_Unaligned_Load
+#endif
+#if index_Fast_Rep_String != index_Prefer_PMINUB_for_stringop
+# error index_Fast_Rep_String != index_Prefer_PMINUB_for_stringop
+#endif
+ cpu_features->feature[index_Fast_Rep_String]
+ |= (bit_Fast_Rep_String
+ | bit_Fast_Copy_Backward
+ | bit_Fast_Unaligned_Load
+ | bit_Prefer_PMINUB_for_stringop);
+ break;
+ }
+ }
+ }
+ /* This spells out "AuthenticAMD". */
+ else if (ebx == 0x68747541 && ecx == 0x444d4163 && edx == 0x69746e65)
+ {
+ kind = arch_kind_amd;
+
+ get_common_indeces (cpu_features, &family, &model);
+
+ ecx = cpu_features->cpuid[COMMON_CPUID_INDEX_1].ecx;
+
+ /* AMD processors prefer SSE instructions for memory/string routines
+ if they are available, otherwise they prefer integer instructions. */
+ if ((ecx & 0x200))
+ cpu_features->feature[index_Prefer_SSE_for_memop]
+ |= bit_Prefer_SSE_for_memop;
+
+ unsigned int eax;
+ __cpuid (0x80000000, eax, ebx, ecx, edx);
+ if (eax >= 0x80000001)
+ __cpuid (0x80000001,
+ cpu_features->cpuid[COMMON_CPUID_INDEX_80000001].eax,
+ cpu_features->cpuid[COMMON_CPUID_INDEX_80000001].ebx,
+ cpu_features->cpuid[COMMON_CPUID_INDEX_80000001].ecx,
+ cpu_features->cpuid[COMMON_CPUID_INDEX_80000001].edx);
+ }
+ else
+ kind = arch_kind_other;
+
+ if (cpu_features->max_cpuid >= 7)
+ __cpuid_count (7, 0,
+ cpu_features->cpuid[COMMON_CPUID_INDEX_7].eax,
+ cpu_features->cpuid[COMMON_CPUID_INDEX_7].ebx,
+ cpu_features->cpuid[COMMON_CPUID_INDEX_7].ecx,
+ cpu_features->cpuid[COMMON_CPUID_INDEX_7].edx);
+
+ /* Can we call xgetbv? */
+ if (HAS_CPU_FEATURE (OSXSAVE))
+ {
+ unsigned int xcrlow;
+ unsigned int xcrhigh;
+ asm ("xgetbv" : "=a" (xcrlow), "=d" (xcrhigh) : "c" (0));
+ /* Is YMM and XMM state usable? */
+ if ((xcrlow & (bit_YMM_state | bit_XMM_state)) ==
+ (bit_YMM_state | bit_XMM_state))
+ {
+ /* Determine if AVX is usable. */
+ if (HAS_CPU_FEATURE (AVX))
+ cpu_features->feature[index_AVX_Usable] |= bit_AVX_Usable;
+#if index_AVX2_Usable != index_AVX_Fast_Unaligned_Load
+# error index_AVX2_Usable != index_AVX_Fast_Unaligned_Load
+#endif
+ /* Determine if AVX2 is usable. Unaligned load with 256-bit
+ AVX registers are faster on processors with AVX2. */
+ if (HAS_CPU_FEATURE (AVX2))
+ cpu_features->feature[index_AVX2_Usable]
+ |= bit_AVX2_Usable | bit_AVX_Fast_Unaligned_Load;
+ /* Check if OPMASK state, upper 256-bit of ZMM0-ZMM15 and
+ ZMM16-ZMM31 state are enabled. */
+ if ((xcrlow & (bit_Opmask_state | bit_ZMM0_15_state
+ | bit_ZMM16_31_state)) ==
+ (bit_Opmask_state | bit_ZMM0_15_state | bit_ZMM16_31_state))
+ {
+ /* Determine if AVX512F is usable. */
+ if (HAS_CPU_FEATURE (AVX512F))
+ {
+ cpu_features->feature[index_AVX512F_Usable]
+ |= bit_AVX512F_Usable;
+ /* Determine if AVX512DQ is usable. */
+ if (HAS_CPU_FEATURE (AVX512DQ))
+ cpu_features->feature[index_AVX512DQ_Usable]
+ |= bit_AVX512DQ_Usable;
+ }
+ }
+ /* Determine if FMA is usable. */
+ if (HAS_CPU_FEATURE (FMA))
+ cpu_features->feature[index_FMA_Usable] |= bit_FMA_Usable;
+ /* Determine if FMA4 is usable. */
+ if (HAS_CPU_FEATURE (FMA4))
+ cpu_features->feature[index_FMA4_Usable] |= bit_FMA4_Usable;
+ }
+ }
+
+ cpu_features->family = family;
+ cpu_features->model = model;
+ cpu_features->kind = kind;
+}
Index: glibc-2.17-c758a686/sysdeps/x86/cpu-features.h
===================================================================
--- /dev/null
+++ glibc-2.17-c758a686/sysdeps/x86/cpu-features.h
@@ -0,0 +1,273 @@
+/* This file is part of the GNU C Library.
+ Copyright (C) 2008-2015 Free Software Foundation, Inc.
+
+ 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
+ <http://www.gnu.org/licenses/>. */
+
+#ifndef cpu_features_h
+#define cpu_features_h
+
+#define bit_Fast_Rep_String (1 << 0)
+#define bit_Fast_Copy_Backward (1 << 1)
+#define bit_Slow_BSF (1 << 2)
+#define bit_Prefer_SSE_for_memop (1 << 3)
+#define bit_Fast_Unaligned_Load (1 << 4)
+#define bit_Prefer_PMINUB_for_stringop (1 << 5)
+#define bit_AVX_Usable (1 << 6)
+#define bit_FMA_Usable (1 << 7)
+#define bit_FMA4_Usable (1 << 8)
+#define bit_Slow_SSE4_2 (1 << 9)
+#define bit_AVX2_Usable (1 << 10)
+#define bit_AVX_Fast_Unaligned_Load (1 << 11)
+#define bit_AVX512F_Usable (1 << 12)
+#define bit_AVX512DQ_Usable (1 << 13)
+
+/* CPUID Feature flags. */
+
+/* COMMON_CPUID_INDEX_1. */
+#define bit_SSE2 (1 << 26)
+#define bit_SSSE3 (1 << 9)
+#define bit_SSE4_1 (1 << 19)
+#define bit_SSE4_2 (1 << 20)
+#define bit_OSXSAVE (1 << 27)
+#define bit_AVX (1 << 28)
+#define bit_POPCOUNT (1 << 23)
+#define bit_FMA (1 << 12)
+#define bit_FMA4 (1 << 16)
+
+/* COMMON_CPUID_INDEX_7. */
+#define bit_RTM (1 << 11)
+#define bit_AVX2 (1 << 5)
+#define bit_AVX512F (1 << 16)
+#define bit_AVX512DQ (1 << 17)
+
+/* XCR0 Feature flags. */
+#define bit_XMM_state (1 << 1)
+#define bit_YMM_state (2 << 1)
+#define bit_Opmask_state (1 << 5)
+#define bit_ZMM0_15_state (1 << 6)
+#define bit_ZMM16_31_state (1 << 7)
+
+/* The integer bit array index for the first set of internal feature bits. */
+#define FEATURE_INDEX_1 0
+
+/* The current maximum size of the feature integer bit array. */
+#define FEATURE_INDEX_MAX 1
+
+#ifdef __ASSEMBLER__
+
+# include <ifunc-defines.h>
+# include <rtld-global-offsets.h>
+
+# define index_SSE2 COMMON_CPUID_INDEX_1*CPUID_SIZE+CPUID_EDX_OFFSET
+# define index_SSSE3 COMMON_CPUID_INDEX_1*CPUID_SIZE+CPUID_ECX_OFFSET
+# define index_SSE4_1 COMMON_CPUID_INDEX_1*CPUID_SIZE+CPUID_ECX_OFFSET
+# define index_SSE4_2 COMMON_CPUID_INDEX_1*CPUID_SIZE+CPUID_ECX_OFFSET
+# define index_AVX COMMON_CPUID_INDEX_1*CPUID_SIZE+CPUID_ECX_OFFSET
+# define index_AVX2 COMMON_CPUID_INDEX_7*CPUID_SIZE+CPUID_EBX_OFFSET
+
+# define index_Fast_Rep_String FEATURE_INDEX_1*FEATURE_SIZE
+# define index_Fast_Copy_Backward FEATURE_INDEX_1*FEATURE_SIZE
+# define index_Slow_BSF FEATURE_INDEX_1*FEATURE_SIZE
+# define index_Prefer_SSE_for_memop FEATURE_INDEX_1*FEATURE_SIZE
+# define index_Fast_Unaligned_Load FEATURE_INDEX_1*FEATURE_SIZE
+# define index_Prefer_PMINUB_for_stringop FEATURE_INDEX_1*FEATURE_SIZE
+# define index_AVX_Usable FEATURE_INDEX_1*FEATURE_SIZE
+# define index_FMA_Usable FEATURE_INDEX_1*FEATURE_SIZE
+# define index_FMA4_Usable FEATURE_INDEX_1*FEATURE_SIZE
+# define index_Slow_SSE4_2 FEATURE_INDEX_1*FEATURE_SIZE
+# define index_AVX2_Usable FEATURE_INDEX_1*FEATURE_SIZE
+# define index_AVX_Fast_Unaligned_Load FEATURE_INDEX_1*FEATURE_SIZE
+# define index_AVX512F_Usable FEATURE_INDEX_1*FEATURE_SIZE
+# define index_AVX512DQ_Usable FEATURE_INDEX_1*FEATURE_SIZE
+
+# if defined (_LIBC) && !IS_IN (nonlib)
+# ifdef __x86_64__
+# ifdef SHARED
+# if IS_IN (rtld)
+# define LOAD_RTLD_GLOBAL_RO_RDX
+# define HAS_FEATURE(offset, name) \
+ testl $(bit_##name), _rtld_local_ro+offset+(index_##name)(%rip)
+# else
+# define LOAD_RTLD_GLOBAL_RO_RDX \
+ mov _rtld_global_ro@GOTPCREL(%rip), %RDX_LP
+# define HAS_FEATURE(offset, name) \
+ testl $(bit_##name), \
+ RTLD_GLOBAL_RO_DL_X86_CPU_FEATURES_OFFSET+offset+(index_##name)(%rdx)
+# endif
+# else /* SHARED */
+# define LOAD_RTLD_GLOBAL_RO_RDX
+# define HAS_FEATURE(offset, name) \
+ testl $(bit_##name), _dl_x86_cpu_features+offset+(index_##name)(%rip)
+# endif /* !SHARED */
+# else /* __x86_64__ */
+# ifdef SHARED
+# define LOAD_FUNC_GOT_EAX(func) \
+ leal func@GOTOFF(%edx), %eax
+# if IS_IN (rtld)
+# define LOAD_GOT_AND_RTLD_GLOBAL_RO \
+ LOAD_PIC_REG(dx)
+# define HAS_FEATURE(offset, name) \
+ testl $(bit_##name), offset+(index_##name)+_rtld_local_ro@GOTOFF(%edx)
+# else
+# define LOAD_GOT_AND_RTLD_GLOBAL_RO \
+ LOAD_PIC_REG(dx); \
+ mov _rtld_global_ro@GOT(%edx), %ecx
+# define HAS_FEATURE(offset, name) \
+ testl $(bit_##name), \
+ RTLD_GLOBAL_RO_DL_X86_CPU_FEATURES_OFFSET+offset+(index_##name)(%ecx)
+# endif
+# else /* SHARED */
+# define LOAD_FUNC_GOT_EAX(func) \
+ leal func, %eax
+# define LOAD_GOT_AND_RTLD_GLOBAL_RO
+# define HAS_FEATURE(offset, name) \
+ testl $(bit_##name), _dl_x86_cpu_features+offset+(index_##name)
+# endif /* !SHARED */
+# endif /* !__x86_64__ */
+# else /* _LIBC && !nonlib */
+# error "Sorry, <cpu-features.h> is unimplemented for assembler"
+# endif /* !_LIBC || nonlib */
+
+/* HAS_* evaluates to true if we may use the feature at runtime. */
+# define HAS_CPU_FEATURE(name) HAS_FEATURE (CPUID_OFFSET, name)
+# define HAS_ARCH_FEATURE(name) HAS_FEATURE (FEATURE_OFFSET, name)
+
+#else /* __ASSEMBLER__ */
+
+# include <sys/param.h>
+# include <sys/types.h>
+# include <sysdep.h>
+# include <stdbool.h>
+
+/* Ugly hack to make it possible to select a strstr and strcasestr
+ implementation that avoids using the stack for 16-byte aligned
+ SSE temporaries. Doing so makes it possible to call the functions
+ with a stack that's not 16-byte aligned as can happen, for example,
+ as a result of compiling the functions' callers with the GCC
+ -mpreferred-stack-boubdary=2 or =3 option, or with the ICC
+ -falign-stack=assume-4-byte option. See rhbz 1150282 for details.
+
+ The ifunc selector uses the unaligned version by default if this
+ file exists and is accessible. */
+# define ENABLE_STRSTR_UNALIGNED_PATHNAME \
+ "/etc/sysconfig/64bit_strstr_via_64bit_strstr_sse2_unaligned"
+
+static bool __attribute__ ((unused))
+use_unaligned_strstr (void)
+{
+ struct stat unaligned_strstr_etc_sysconfig_file;
+
+ /* TLS may not have been set up yet, so avoid using stat since it tries to
+ set errno. */
+ return INTERNAL_SYSCALL (stat, , 2,
+ ENABLE_STRSTR_UNALIGNED_PATHNAME,
+ &unaligned_strstr_etc_sysconfig_file) == 0;
+}
+
+enum
+ {
+ COMMON_CPUID_INDEX_1 = 0,
+ COMMON_CPUID_INDEX_7,
+ COMMON_CPUID_INDEX_80000001, /* for AMD */
+ /* Keep the following line at the end. */
+ COMMON_CPUID_INDEX_MAX
+ };
+
+struct cpu_features
+{
+ enum cpu_features_kind
+ {
+ arch_kind_unknown = 0,
+ arch_kind_intel,
+ arch_kind_amd,
+ arch_kind_other
+ } kind;
+ int max_cpuid;
+ struct cpuid_registers
+ {
+ unsigned int eax;
+ unsigned int ebx;
+ unsigned int ecx;
+ unsigned int edx;
+ } cpuid[COMMON_CPUID_INDEX_MAX];
+ unsigned int family;
+ unsigned int model;
+ unsigned int feature[FEATURE_INDEX_MAX];
+};
+
+/* Used from outside of glibc to get access to the CPU features
+ structure. */
+extern const struct cpu_features *__get_cpu_features (void)
+ __attribute__ ((const));
+
+# if defined (_LIBC) && !IS_IN (nonlib)
+/* Unused for x86. */
+# define INIT_ARCH()
+# define __get_cpu_features() (&GLRO(dl_x86_cpu_features))
+# endif
+
+
+/* HAS_* evaluates to true if we may use the feature at runtime. */
+# define HAS_CPU_FEATURE(name) \
+ ((__get_cpu_features ()->cpuid[index_##name].reg_##name & (bit_##name)) != 0)
+# define HAS_ARCH_FEATURE(name) \
+ ((__get_cpu_features ()->feature[index_##name] & (bit_##name)) != 0)
+
+# define index_SSE2 COMMON_CPUID_INDEX_1
+# define index_SSSE3 COMMON_CPUID_INDEX_1
+# define index_SSE4_1 COMMON_CPUID_INDEX_1
+# define index_SSE4_2 COMMON_CPUID_INDEX_1
+# define index_AVX COMMON_CPUID_INDEX_1
+# define index_AVX2 COMMON_CPUID_INDEX_7
+# define index_AVX512F COMMON_CPUID_INDEX_7
+# define index_AVX512DQ COMMON_CPUID_INDEX_7
+# define index_RTM COMMON_CPUID_INDEX_7
+# define index_FMA COMMON_CPUID_INDEX_1
+# define index_FMA4 COMMON_CPUID_INDEX_80000001
+# define index_POPCOUNT COMMON_CPUID_INDEX_1
+# define index_OSXSAVE COMMON_CPUID_INDEX_1
+
+# define reg_SSE2 edx
+# define reg_SSSE3 ecx
+# define reg_SSE4_1 ecx
+# define reg_SSE4_2 ecx
+# define reg_AVX ecx
+# define reg_AVX2 ebx
+# define reg_AVX512F ebx
+# define reg_AVX512DQ ebx
+# define reg_RTM ebx
+# define reg_FMA ecx
+# define reg_FMA4 ecx
+# define reg_POPCOUNT ecx
+# define reg_OSXSAVE ecx
+
+# define index_Fast_Rep_String FEATURE_INDEX_1
+# define index_Fast_Copy_Backward FEATURE_INDEX_1
+# define index_Slow_BSF FEATURE_INDEX_1
+# define index_Prefer_SSE_for_memop FEATURE_INDEX_1
+# define index_Fast_Unaligned_Load FEATURE_INDEX_1
+# define index_Prefer_PMINUB_for_stringop FEATURE_INDEX_1
+# define index_AVX_Usable FEATURE_INDEX_1
+# define index_FMA_Usable FEATURE_INDEX_1
+# define index_FMA4_Usable FEATURE_INDEX_1
+# define index_Slow_SSE4_2 FEATURE_INDEX_1
+# define index_AVX2_Usable FEATURE_INDEX_1
+# define index_AVX_Fast_Unaligned_Load FEATURE_INDEX_1
+# define index_AVX512F_Usable FEATURE_INDEX_1
+# define index_AVX512DQ_Usable FEATURE_INDEX_1
+
+#endif /* !__ASSEMBLER__ */
+
+#endif /* cpu_features_h */
Index: glibc-2.17-c758a686/sysdeps/x86/dl-get-cpu-features.c
===================================================================
--- /dev/null
+++ glibc-2.17-c758a686/sysdeps/x86/dl-get-cpu-features.c
@@ -0,0 +1,27 @@
+/* This file is part of the GNU C Library.
+ Copyright (C) 2015 Free Software Foundation, Inc.
+
+ 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
+ <http://www.gnu.org/licenses/>. */
+
+
+#include <ldsodefs.h>
+
+#undef __get_cpu_features
+
+const struct cpu_features *
+__get_cpu_features (void)
+{
+ return &GLRO(dl_x86_cpu_features);
+}
Index: glibc-2.17-c758a686/sysdeps/x86/libc-start.c
===================================================================
--- /dev/null
+++ glibc-2.17-c758a686/sysdeps/x86/libc-start.c
@@ -0,0 +1,41 @@
+/* Copyright (C) 2015 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
+ <http://www.gnu.org/licenses/>. */
+
+#ifdef SHARED
+# include <csu/libc-start.c>
+# else
+/* The main work is done in the generic function. */
+# define LIBC_START_DISABLE_INLINE
+# define LIBC_START_MAIN generic_start_main
+# include <csu/libc-start.c>
+# include <cpu-features.h>
+# include <cpu-features.c>
+
+extern struct cpu_features _dl_x86_cpu_features;
+
+int
+__libc_start_main (int (*main) (int, char **, char ** MAIN_AUXVEC_DECL),
+ int argc, char **argv,
+ __typeof (main) init,
+ void (*fini) (void),
+ void (*rtld_fini) (void), void *stack_end)
+{
+ init_cpu_features (&_dl_x86_cpu_features);
+ return generic_start_main (main, argc, argv, init, fini, rtld_fini,
+ stack_end);
+}
+#endif
Index: glibc-2.17-c758a686/sysdeps/x86/rtld-global-offsets.sym
===================================================================
--- /dev/null
+++ glibc-2.17-c758a686/sysdeps/x86/rtld-global-offsets.sym
@@ -0,0 +1,7 @@
+#define SHARED 1
+
+#include <ldsodefs.h>
+
+#define rtld_global_ro_offsetof(mem) offsetof (struct rtld_global_ro, mem)
+
+RTLD_GLOBAL_RO_DL_X86_CPU_FEATURES_OFFSET rtld_global_ro_offsetof (_dl_x86_cpu_features)
Index: glibc-2.17-c758a686/sysdeps/x86/tst-get-cpu-features-static.c
===================================================================
--- /dev/null
+++ glibc-2.17-c758a686/sysdeps/x86/tst-get-cpu-features-static.c
@@ -0,0 +1 @@
+#include "tst-get-cpu-features.c"
Index: glibc-2.17-c758a686/sysdeps/x86/tst-get-cpu-features.c
===================================================================
--- /dev/null
+++ glibc-2.17-c758a686/sysdeps/x86/tst-get-cpu-features.c
@@ -0,0 +1,31 @@
+/* Test case for x86 __get_cpu_features interface
+ Copyright (C) 2015 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
+ <http://www.gnu.org/licenses/>. */
+
+#include <stdlib.h>
+#include <cpu-features.h>
+
+static int
+do_test (void)
+{
+ if (__get_cpu_features ()->kind == arch_kind_unknown)
+ abort ();
+ return 0;
+}
+
+#define TEST_FUNCTION do_test ()
+#include "../../test-skeleton.c"
Index: glibc-2.17-c758a686/sysdeps/x86_64/cacheinfo.c
===================================================================
--- glibc-2.17-c758a686.orig/sysdeps/x86_64/cacheinfo.c
+++ glibc-2.17-c758a686/sysdeps/x86_64/cacheinfo.c
@@ -21,40 +21,11 @@
#include <stdlib.h>
#include <unistd.h>
#include <cpuid.h>
+#include "multiarch/init-arch.h"
-#ifndef __cpuid_count
-/* FIXME: Provide __cpuid_count if it isn't defined. Copied from gcc
- 4.4.0. Remove this if gcc 4.4 is the minimum requirement. */
-# if defined(__i386__) && defined(__PIC__)
-/* %ebx may be the PIC register. */
-# define __cpuid_count(level, count, a, b, c, d) \
- __asm__ ("xchg{l}\t{%%}ebx, %1\n\t" \
- "cpuid\n\t" \
- "xchg{l}\t{%%}ebx, %1\n\t" \
- : "=a" (a), "=r" (b), "=c" (c), "=d" (d) \
- : "0" (level), "2" (count))
-# else
-# define __cpuid_count(level, count, a, b, c, d) \
- __asm__ ("cpuid\n\t" \
- : "=a" (a), "=b" (b), "=c" (c), "=d" (d) \
- : "0" (level), "2" (count))
-# endif
-#endif
-
-#ifdef USE_MULTIARCH
-# include "multiarch/init-arch.h"
-
-# define is_intel __cpu_features.kind == arch_kind_intel
-# define is_amd __cpu_features.kind == arch_kind_amd
-# define max_cpuid __cpu_features.max_cpuid
-#else
- /* This spells out "GenuineIntel". */
-# define is_intel \
- ebx == 0x756e6547 && ecx == 0x6c65746e && edx == 0x49656e69
- /* This spells out "AuthenticAMD". */
-# define is_amd \
- ebx == 0x68747541 && ecx == 0x444d4163 && edx == 0x69746e65
-#endif
+#define is_intel GLRO(dl_x86_cpu_features).kind == arch_kind_intel
+#define is_amd GLRO(dl_x86_cpu_features).kind == arch_kind_amd
+#define max_cpuid GLRO(dl_x86_cpu_features).max_cpuid
static const struct intel_02_cache_info
{
@@ -237,21 +208,8 @@ intel_check_word (int name, unsigned int
/* Intel reused this value. For family 15, model 6 it
specifies the 3rd level cache. Otherwise the 2nd
level cache. */
- unsigned int family;
- unsigned int model;
-#ifdef USE_MULTIARCH
- family = __cpu_features.family;
- model = __cpu_features.model;
-#else
- unsigned int eax;
- unsigned int ebx;
- unsigned int ecx;
- unsigned int edx;
- __cpuid (1, eax, ebx, ecx, edx);
-
- family = ((eax >> 20) & 0xff) + ((eax >> 8) & 0xf);
- model = (((eax >>16) & 0xf) << 4) + ((eax >> 4) & 0xf);
-#endif
+ unsigned int family = GLRO(dl_x86_cpu_features).family;
+ unsigned int model = GLRO(dl_x86_cpu_features).model;
if (family == 15 && model == 6)
{
@@ -478,18 +436,6 @@ long int
attribute_hidden
__cache_sysconf (int name)
{
-#ifdef USE_MULTIARCH
- if (__cpu_features.kind == arch_kind_unknown)
- __init_cpu_features ();
-#else
- /* Find out what brand of processor. */
- unsigned int max_cpuid;
- unsigned int ebx;
- unsigned int ecx;
- unsigned int edx;
- __cpuid (0, max_cpuid, ebx, ecx, edx);
-#endif
-
if (is_intel)
return handle_intel (name, max_cpuid);
@@ -525,18 +471,6 @@ long int __x86_64_raw_shared_cache_size
int __x86_64_prefetchw attribute_hidden;
#endif
-#ifndef DISABLE_PREFERRED_MEMORY_INSTRUCTION
-/* Instructions preferred for memory and string routines.
-
- 0: Regular instructions
- 1: MMX instructions
- 2: SSE2 instructions
- 3: SSSE3 instructions
-
- */
-int __x86_64_preferred_memory_instruction attribute_hidden;
-#endif
-
static void
__attribute__((constructor))
@@ -553,14 +487,6 @@ init_cacheinfo (void)
unsigned int level;
unsigned int threads = 0;
-#ifdef USE_MULTIARCH
- if (__cpu_features.kind == arch_kind_unknown)
- __init_cpu_features ();
-#else
- int max_cpuid;
- __cpuid (0, max_cpuid, ebx, ecx, edx);
-#endif
-
if (is_intel)
{
data = handle_intel (_SC_LEVEL1_DCACHE_SIZE, max_cpuid);
@@ -576,34 +502,13 @@ init_cacheinfo (void)
shared = handle_intel (_SC_LEVEL2_CACHE_SIZE, max_cpuid);
}
- unsigned int ebx_1;
-
-#ifdef USE_MULTIARCH
- eax = __cpu_features.cpuid[COMMON_CPUID_INDEX_1].eax;
- ebx_1 = __cpu_features.cpuid[COMMON_CPUID_INDEX_1].ebx;
- ecx = __cpu_features.cpuid[COMMON_CPUID_INDEX_1].ecx;
- edx = __cpu_features.cpuid[COMMON_CPUID_INDEX_1].edx;
-#else
- __cpuid (1, eax, ebx_1, ecx, edx);
-#endif
-
- unsigned int family = (eax >> 8) & 0x0f;
- unsigned int model = (eax >> 4) & 0x0f;
- unsigned int extended_model = (eax >> 12) & 0xf0;
-
-#ifndef DISABLE_PREFERRED_MEMORY_INSTRUCTION
- /* Intel prefers SSSE3 instructions for memory/string routines
- if they are available. */
- if ((ecx & 0x200))
- __x86_64_preferred_memory_instruction = 3;
- else
- __x86_64_preferred_memory_instruction = 2;
-#endif
-
/* Figure out the number of logical threads that share the
highest cache level. */
if (max_cpuid >= 4)
{
+ unsigned int family = GLRO(dl_x86_cpu_features).family;
+ unsigned int model = GLRO(dl_x86_cpu_features).model;
+
int i = 0;
/* Query until desired cache level is enumerated. */
@@ -655,7 +560,6 @@ init_cacheinfo (void)
threads += 1;
if (threads > 2 && level == 2 && family == 6)
{
- model += extended_model;
switch (model)
{
case 0x57:
@@ -678,7 +582,9 @@ init_cacheinfo (void)
intel_bug_no_cache_info:
/* Assume that all logical threads share the highest cache level. */
- threads = (ebx_1 >> 16) & 0xff;
+ threads
+ = ((GLRO(dl_x86_cpu_features).cpuid[COMMON_CPUID_INDEX_1].ebx
+ >> 16) & 0xff);
}
/* Cap usage of highest cache level to the number of supported
@@ -693,25 +599,6 @@ init_cacheinfo (void)
long int core = handle_amd (_SC_LEVEL2_CACHE_SIZE);
shared = handle_amd (_SC_LEVEL3_CACHE_SIZE);
-#ifndef DISABLE_PREFERRED_MEMORY_INSTRUCTION
-# ifdef USE_MULTIARCH
- eax = __cpu_features.cpuid[COMMON_CPUID_INDEX_1].eax;
- ebx = __cpu_features.cpuid[COMMON_CPUID_INDEX_1].ebx;
- ecx = __cpu_features.cpuid[COMMON_CPUID_INDEX_1].ecx;
- edx = __cpu_features.cpuid[COMMON_CPUID_INDEX_1].edx;
-# else
- __cpuid (1, eax, ebx, ecx, edx);
-# endif
-
- /* AMD prefers SSSE3 instructions for memory/string routines
- if they are avaiable, otherwise it prefers integer
- instructions. */
- if ((ecx & 0x200))
- __x86_64_preferred_memory_instruction = 3;
- else
- __x86_64_preferred_memory_instruction = 0;
-#endif
-
/* Get maximum extended function. */
__cpuid (0x80000000, max_cpuid_ex, ebx, ecx, edx);
Index: glibc-2.17-c758a686/sysdeps/x86_64/dl-machine.h
===================================================================
--- glibc-2.17-c758a686.orig/sysdeps/x86_64/dl-machine.h
+++ glibc-2.17-c758a686/sysdeps/x86_64/dl-machine.h
@@ -26,6 +26,7 @@
#include <sysdep.h>
#include <tls.h>
#include <dl-tlsdesc.h>
+#include <cpu-features.c>
/* Return nonzero iff ELF header is compatible with the running host. */
static inline int __attribute__ ((unused))
@@ -200,6 +201,8 @@ dl_platform_init (void)
if (GLRO(dl_platform) != NULL && *GLRO(dl_platform) == '\0')
/* Avoid an empty string which would disturb us. */
GLRO(dl_platform) = NULL;
+
+ init_cpu_features (&GLRO(dl_x86_cpu_features));
}
static inline ElfW(Addr)
Index: glibc-2.17-c758a686/sysdeps/x86_64/dl-procinfo.c
===================================================================
--- /dev/null
+++ glibc-2.17-c758a686/sysdeps/x86_64/dl-procinfo.c
@@ -0,0 +1,57 @@
+/* Data for x86-64 version of processor capability information.
+ Copyright (C) 2015 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
+ <http://www.gnu.org/licenses/>. */
+
+/* If anything should be added here check whether the size of each string
+ is still ok with the given array size.
+
+ All the #ifdefs in the definitions are quite irritating but
+ necessary if we want to avoid duplicating the information. There
+ are three different modes:
+
+ - PROCINFO_DECL is defined. This means we are only interested in
+ declarations.
+
+ - PROCINFO_DECL is not defined:
+
+ + if SHARED is defined the file is included in an array
+ initializer. The .element = { ... } syntax is needed.
+
+ + if SHARED is not defined a normal array initialization is
+ needed.
+ */
+
+#ifndef PROCINFO_CLASS
+# define PROCINFO_CLASS
+#endif
+
+#if !defined PROCINFO_DECL && defined SHARED
+ ._dl_x86_cpu_features
+#else
+PROCINFO_CLASS struct cpu_features _dl_x86_cpu_features
+#endif
+#ifndef PROCINFO_DECL
+= { }
+#endif
+#if !defined SHARED || defined PROCINFO_DECL
+;
+#else
+,
+#endif
+
+#undef PROCINFO_DECL
+#undef PROCINFO_CLASS
Index: glibc-2.17-c758a686/sysdeps/x86_64/ldsodefs.h
===================================================================
--- glibc-2.17-c758a686.orig/sysdeps/x86_64/ldsodefs.h
+++ glibc-2.17-c758a686/sysdeps/x86_64/ldsodefs.h
@@ -20,6 +20,7 @@
#define _X86_64_LDSODEFS_H 1
#include <elf.h>
+#include <cpu-features.h>
struct La_x86_64_regs;
struct La_x86_64_retval;
Index: glibc-2.17-c758a686/sysdeps/x86_64/multiarch/Makefile
===================================================================
--- glibc-2.17-c758a686.orig/sysdeps/x86_64/multiarch/Makefile
+++ glibc-2.17-c758a686/sysdeps/x86_64/multiarch/Makefile
@@ -1,5 +1,4 @@
ifeq ($(subdir),csu)
-aux += init-arch
tests += test-multiarch
gen-as-const-headers += ifunc-defines.sym
endif
Index: glibc-2.17-c758a686/sysdeps/x86_64/multiarch/Versions
===================================================================
--- glibc-2.17-c758a686.orig/sysdeps/x86_64/multiarch/Versions
+++ /dev/null
@@ -1,5 +0,0 @@
-libc {
- GLIBC_PRIVATE {
- __get_cpu_features;
- }
-}
Index: glibc-2.17-c758a686/sysdeps/x86_64/multiarch/cacheinfo.c
===================================================================
--- glibc-2.17-c758a686.orig/sysdeps/x86_64/multiarch/cacheinfo.c
+++ /dev/null
@@ -1,2 +0,0 @@
-#define DISABLE_PREFERRED_MEMORY_INSTRUCTION
-#include "../cacheinfo.c"
Index: glibc-2.17-c758a686/sysdeps/x86_64/multiarch/ifunc-defines.sym
===================================================================
--- glibc-2.17-c758a686.orig/sysdeps/x86_64/multiarch/ifunc-defines.sym
+++ glibc-2.17-c758a686/sysdeps/x86_64/multiarch/ifunc-defines.sym
@@ -4,7 +4,6 @@
--
CPU_FEATURES_SIZE sizeof (struct cpu_features)
-KIND_OFFSET offsetof (struct cpu_features, kind)
CPUID_OFFSET offsetof (struct cpu_features, cpuid)
CPUID_SIZE sizeof (struct cpuid_registers)
CPUID_EAX_OFFSET offsetof (struct cpuid_registers, eax)
Index: glibc-2.17-c758a686/sysdeps/x86_64/multiarch/init-arch.c
===================================================================
--- glibc-2.17-c758a686.orig/sysdeps/x86_64/multiarch/init-arch.c
+++ /dev/null
@@ -1,183 +0,0 @@
-/* Initialize CPU feature data.
- This file is part of the GNU C Library.
- Copyright (C) 2008-2012 Free Software Foundation, Inc.
- Contributed by Ulrich Drepper <drepper@redhat.com>.
-
- 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
- <http://www.gnu.org/licenses/>. */
-
-#include <atomic.h>
-#include <cpuid.h>
-#include "init-arch.h"
-
-
-struct cpu_features __cpu_features attribute_hidden;
-
-
-static void
-get_common_indeces (unsigned int *family, unsigned int *model)
-{
- __cpuid (1, __cpu_features.cpuid[COMMON_CPUID_INDEX_1].eax,
- __cpu_features.cpuid[COMMON_CPUID_INDEX_1].ebx,
- __cpu_features.cpuid[COMMON_CPUID_INDEX_1].ecx,
- __cpu_features.cpuid[COMMON_CPUID_INDEX_1].edx);
-
- unsigned int eax = __cpu_features.cpuid[COMMON_CPUID_INDEX_1].eax;
- *family = (eax >> 8) & 0x0f;
- *model = (eax >> 4) & 0x0f;
-}
-
-
-void
-__init_cpu_features (void)
-{
- unsigned int ebx;
- unsigned int ecx;
- unsigned int edx;
- unsigned int family = 0;
- unsigned int model = 0;
- enum cpu_features_kind kind;
-
- __cpuid (0, __cpu_features.max_cpuid, ebx, ecx, edx);
-
- /* This spells out "GenuineIntel". */
- if (ebx == 0x756e6547 && ecx == 0x6c65746e && edx == 0x49656e69)
- {
- kind = arch_kind_intel;
-
- get_common_indeces (&family, &model);
-
- /* Intel processors prefer SSE instruction for memory/string
- routines if they are available. */
- __cpu_features.feature[index_Prefer_SSE_for_memop]
- |= bit_Prefer_SSE_for_memop;
-
- unsigned int eax = __cpu_features.cpuid[COMMON_CPUID_INDEX_1].eax;
- unsigned int extended_family = (eax >> 20) & 0xff;
- unsigned int extended_model = (eax >> 12) & 0xf0;
- if (family == 0x0f)
- {
- family += extended_family;
- model += extended_model;
- }
- else if (family == 0x06)
- {
- ecx = __cpu_features.cpuid[COMMON_CPUID_INDEX_1].ecx;
- model += extended_model;
- switch (model)
- {
- case 0x1c:
- case 0x26:
- /* BSF is slow on Atom. */
- __cpu_features.feature[index_Slow_BSF] |= bit_Slow_BSF;
- break;
-
- default:
- /* Unknown family 0x06 processors. Assuming this is one
- of Core i3/i5/i7 processors if AVX is available. */
- if ((ecx & bit_AVX) == 0)
- break;
-
- case 0x1a:
- case 0x1e:
- case 0x1f:
- case 0x25:
- case 0x2c:
- case 0x2e:
- case 0x2f:
- /* Rep string instructions, copy backward, unaligned loads
- and pminub are fast on Intel Core i3, i5 and i7. */
-#if index_Fast_Rep_String != index_Fast_Copy_Backward
-# error index_Fast_Rep_String != index_Fast_Copy_Backward
-#endif
-#if index_Fast_Rep_String != index_Fast_Unaligned_Load
-# error index_Fast_Rep_String != index_Fast_Unaligned_Load
-#endif
-#if index_Fast_Rep_String != index_Prefer_PMINUB_for_stringop
-# error index_Fast_Rep_String != index_Prefer_PMINUB_for_stringop
-#endif
- __cpu_features.feature[index_Fast_Rep_String]
- |= (bit_Fast_Rep_String
- | bit_Fast_Copy_Backward
- | bit_Fast_Unaligned_Load
- | bit_Prefer_PMINUB_for_stringop);
- break;
- }
- }
- }
- /* This spells out "AuthenticAMD". */
- else if (ebx == 0x68747541 && ecx == 0x444d4163 && edx == 0x69746e65)
- {
- kind = arch_kind_amd;
-
- get_common_indeces (&family, &model);
-
- ecx = __cpu_features.cpuid[COMMON_CPUID_INDEX_1].ecx;
-
- /* AMD processors prefer SSE instructions for memory/string routines
- if they are available, otherwise they prefer integer instructions. */
- if ((ecx & 0x200))
- __cpu_features.feature[index_Prefer_SSE_for_memop]
- |= bit_Prefer_SSE_for_memop;
-
- unsigned int eax;
- __cpuid (0x80000000, eax, ebx, ecx, edx);
- if (eax >= 0x80000001)
- __cpuid (0x80000001,
- __cpu_features.cpuid[COMMON_CPUID_INDEX_80000001].eax,
- __cpu_features.cpuid[COMMON_CPUID_INDEX_80000001].ebx,
- __cpu_features.cpuid[COMMON_CPUID_INDEX_80000001].ecx,
- __cpu_features.cpuid[COMMON_CPUID_INDEX_80000001].edx);
- }
- else
- kind = arch_kind_other;
-
- /* Can we call xgetbv? */
- if (CPUID_OSXSAVE)
- {
- unsigned int xcrlow;
- unsigned int xcrhigh;
- asm ("xgetbv" : "=a" (xcrlow), "=d" (xcrhigh) : "c" (0));
- /* Is YMM and XMM state usable? */
- if ((xcrlow & (bit_YMM_state | bit_XMM_state)) ==
- (bit_YMM_state | bit_XMM_state))
- {
- /* Determine if AVX is usable. */
- if (CPUID_AVX)
- __cpu_features.feature[index_AVX_Usable] |= bit_AVX_Usable;
- /* Determine if FMA is usable. */
- if (CPUID_FMA)
- __cpu_features.feature[index_FMA_Usable] |= bit_FMA_Usable;
- /* Determine if FMA4 is usable. */
- if (CPUID_FMA4)
- __cpu_features.feature[index_FMA4_Usable] |= bit_FMA4_Usable;
- }
- }
-
- __cpu_features.family = family;
- __cpu_features.model = model;
- atomic_write_barrier ();
- __cpu_features.kind = kind;
-}
-
-#undef __get_cpu_features
-
-const struct cpu_features *
-__get_cpu_features (void)
-{
- if (__cpu_features.kind == arch_kind_unknown)
- __init_cpu_features ();
-
- return &__cpu_features;
-}
Index: glibc-2.17-c758a686/sysdeps/x86_64/multiarch/init-arch.h
===================================================================
--- glibc-2.17-c758a686.orig/sysdeps/x86_64/multiarch/init-arch.h
+++ glibc-2.17-c758a686/sysdeps/x86_64/multiarch/init-arch.h
@@ -15,183 +15,8 @@
License along with the GNU C Library; if not, see
<http://www.gnu.org/licenses/>. */
-#define bit_Fast_Rep_String (1 << 0)
-#define bit_Fast_Copy_Backward (1 << 1)
-#define bit_Slow_BSF (1 << 2)
-#define bit_Prefer_SSE_for_memop (1 << 3)
-#define bit_Fast_Unaligned_Load (1 << 4)
-#define bit_Prefer_PMINUB_for_stringop (1 << 5)
-#define bit_AVX_Usable (1 << 6)
-#define bit_FMA_Usable (1 << 7)
-#define bit_FMA4_Usable (1 << 8)
-
-/* CPUID Feature flags. */
-#define bit_SSE2 (1 << 26)
-#define bit_SSSE3 (1 << 9)
-#define bit_SSE4_1 (1 << 19)
-#define bit_SSE4_2 (1 << 20)
-#define bit_OSXSAVE (1 << 27)
-#define bit_AVX (1 << 28)
-#define bit_POPCOUNT (1 << 23)
-#define bit_FMA (1 << 12)
-#define bit_FMA4 (1 << 16)
-
-/* XCR0 Feature flags. */
-#define bit_XMM_state (1 << 1)
-#define bit_YMM_state (2 << 1)
-
-#ifdef __ASSEMBLER__
-
-# include <ifunc-defines.h>
-
-# define index_SSE2 COMMON_CPUID_INDEX_1*CPUID_SIZE+CPUID_EDX_OFFSET
-# define index_SSSE3 COMMON_CPUID_INDEX_1*CPUID_SIZE+CPUID_ECX_OFFSET
-# define index_SSE4_1 COMMON_CPUID_INDEX_1*CPUID_SIZE+CPUID_ECX_OFFSET
-# define index_SSE4_2 COMMON_CPUID_INDEX_1*CPUID_SIZE+CPUID_ECX_OFFSET
-# define index_AVX COMMON_CPUID_INDEX_1*CPUID_SIZE+CPUID_ECX_OFFSET
-
-# define index_Fast_Rep_String FEATURE_INDEX_1*FEATURE_SIZE
-# define index_Fast_Copy_Backward FEATURE_INDEX_1*FEATURE_SIZE
-# define index_Slow_BSF FEATURE_INDEX_1*FEATURE_SIZE
-# define index_Prefer_SSE_for_memop FEATURE_INDEX_1*FEATURE_SIZE
-# define index_Fast_Unaligned_Load FEATURE_INDEX_1*FEATURE_SIZE
-# define index_Prefer_PMINUB_for_stringop FEATURE_INDEX_1*FEATURE_SIZE
-# define index_AVX_Usable FEATURE_INDEX_1*FEATURE_SIZE
-# define index_FMA_Usable FEATURE_INDEX_1*FEATURE_SIZE
-# define index_FMA4_Usable FEATURE_INDEX_1*FEATURE_SIZE
-
-#else /* __ASSEMBLER__ */
-
-# include <sys/param.h>
-# include <sys/types.h>
-# include <sysdep.h>
-# include <stdbool.h>
-
-/* Ugly hack to make it possible to select a strstr and strcasestr
- implementation that avoids using the stack for 16-byte aligned
- SSE temporaries. Doing so makes it possible to call the functions
- with a stack that's not 16-byte aligned as can happen, for example,
- as a result of compiling the functions' callers with the GCC
- -mpreferred-stack-boubdary=2 or =3 option, or with the ICC
- -falign-stack=assume-4-byte option. See rhbz 1150282 for details.
-
- The ifunc selector uses the unaligned version by default if this
- file exists and is accessible. */
-# define ENABLE_STRSTR_UNALIGNED_PATHNAME \
- "/etc/sysconfig/64bit_strstr_via_64bit_strstr_sse2_unaligned"
-
-static bool __attribute__ ((unused))
-use_unaligned_strstr (void)
-{
- struct stat unaligned_strstr_etc_sysconfig_file;
-
- /* TLS may not have been set up yet, so avoid using stat since it tries to
- set errno. */
- return INTERNAL_SYSCALL (stat, , 2,
- ENABLE_STRSTR_UNALIGNED_PATHNAME,
- &unaligned_strstr_etc_sysconfig_file) == 0;
-}
-
-enum
- {
- COMMON_CPUID_INDEX_1 = 0,
- COMMON_CPUID_INDEX_80000001, /* for AMD */
- /* Keep the following line at the end. */
- COMMON_CPUID_INDEX_MAX
- };
-
-enum
- {
- FEATURE_INDEX_1 = 0,
- /* Keep the following line at the end. */
- FEATURE_INDEX_MAX
- };
-
-extern struct cpu_features
-{
- enum cpu_features_kind
- {
- arch_kind_unknown = 0,
- arch_kind_intel,
- arch_kind_amd,
- arch_kind_other
- } kind;
- int max_cpuid;
- struct cpuid_registers
- {
- unsigned int eax;
- unsigned int ebx;
- unsigned int ecx;
- unsigned int edx;
- } cpuid[COMMON_CPUID_INDEX_MAX];
- unsigned int family;
- unsigned int model;
- unsigned int feature[FEATURE_INDEX_MAX];
-} __cpu_features attribute_hidden;
-
-
-extern void __init_cpu_features (void) attribute_hidden;
-# define INIT_ARCH() \
- do \
- if (__cpu_features.kind == arch_kind_unknown) \
- __init_cpu_features (); \
- while (0)
-
-/* Used from outside libc.so to get access to the CPU features structure. */
-extern const struct cpu_features *__get_cpu_features (void)
- __attribute__ ((const));
-
-# if IS_IN (libc)
-# define __get_cpu_features() (&__cpu_features)
-# endif
-
-# define HAS_CPU_FEATURE(idx, reg, bit) \
- ((__get_cpu_features ()->cpuid[idx].reg & (bit)) != 0)
-
-/* Following are the feature tests used throughout libc. */
-
-/* CPUID_* evaluates to true if the feature flag is enabled.
- We always use &__cpu_features because the HAS_CPUID_* macros
- are called only within __init_cpu_features, where we can't
- call __get_cpu_features without infinite recursion. */
-# define HAS_CPUID_FLAG(idx, reg, bit) \
- (((&__cpu_features)->cpuid[idx].reg & (bit)) != 0)
-
-# define CPUID_OSXSAVE \
- HAS_CPUID_FLAG (COMMON_CPUID_INDEX_1, ecx, bit_OSXSAVE)
-# define CPUID_AVX \
- HAS_CPUID_FLAG (COMMON_CPUID_INDEX_1, ecx, bit_AVX)
-# define CPUID_FMA \
- HAS_CPUID_FLAG (COMMON_CPUID_INDEX_1, ecx, bit_FMA)
-# define CPUID_FMA4 \
- HAS_CPUID_FLAG (COMMON_CPUID_INDEX_80000001, ecx, bit_FMA4)
-
-/* HAS_* evaluates to true if we may use the feature at runtime. */
-# define HAS_SSE2 HAS_CPU_FEATURE (COMMON_CPUID_INDEX_1, edx, bit_SSE2)
-# define HAS_POPCOUNT HAS_CPU_FEATURE (COMMON_CPUID_INDEX_1, ecx, bit_POPCOUNT)
-# define HAS_SSSE3 HAS_CPU_FEATURE (COMMON_CPUID_INDEX_1, ecx, bit_SSSE3)
-# define HAS_SSE4_1 HAS_CPU_FEATURE (COMMON_CPUID_INDEX_1, ecx, bit_SSE4_1)
-# define HAS_SSE4_2 HAS_CPU_FEATURE (COMMON_CPUID_INDEX_1, ecx, bit_SSE4_2)
-
-# define index_Fast_Rep_String FEATURE_INDEX_1
-# define index_Fast_Copy_Backward FEATURE_INDEX_1
-# define index_Slow_BSF FEATURE_INDEX_1
-# define index_Prefer_SSE_for_memop FEATURE_INDEX_1
-# define index_Fast_Unaligned_Load FEATURE_INDEX_1
-# define index_AVX_Usable FEATURE_INDEX_1
-# define index_FMA_Usable FEATURE_INDEX_1
-# define index_FMA4_Usable FEATURE_INDEX_1
-
-# define HAS_ARCH_FEATURE(name) \
- ((__get_cpu_features ()->feature[index_##name] & (bit_##name)) != 0)
-
-# define HAS_FAST_REP_STRING HAS_ARCH_FEATURE (Fast_Rep_String)
-# define HAS_FAST_COPY_BACKWARD HAS_ARCH_FEATURE (Fast_Copy_Backward)
-# define HAS_SLOW_BSF HAS_ARCH_FEATURE (Slow_BSF)
-# define HAS_PREFER_SSE_FOR_MEMOP HAS_ARCH_FEATURE (Prefer_SSE_for_memop)
-# define HAS_FAST_UNALIGNED_LOAD HAS_ARCH_FEATURE (Fast_Unaligned_Load)
-# define HAS_AVX HAS_ARCH_FEATURE (AVX_Usable)
-# define HAS_FMA HAS_ARCH_FEATURE (FMA_Usable)
-# define HAS_FMA4 HAS_ARCH_FEATURE (FMA4_Usable)
-
-#endif /* __ASSEMBLER__ */
+#ifdef __ASSEMBLER__
+# include <cpu-features.h>
+#else
+# include <ldsodefs.h>
+#endif