x86: Set dl_platform and dl_hwcap from CPU features [BZ #21391]

dl_platform and dl_hwcap are set from AT_PLATFORM and AT_HWCAP very
early during startup.  They are used by dynamic linker to determine
platform and build an array of hardware capability names, which are
added to search path when loading shared object.  dl_platform and
dl_hwcap are unused on x86-64.  On i386, i386, i486, i586 and i686
platforms were supported and only SSE2 capability was used.

On x86, usage of AT_PLATFORM and AT_HWCAP to determine platform and
processor capabilities is obsolete since all information is available
in dl_x86_cpu_features.  This patch sets dl_platform and dl_hwcap from
dl_x86_cpu_features in dynamic linker.  On i386, the available plaforms
are changed to i586 and i686 since i386 has been deprecated.  On x86-64,
the available plaforms are haswell, which is for Haswell class processors
with BMI1, BMI2, LZCNT, MOVBE, POPCNT, AVX2 and FMA, and xeon_phi, which
is for Xeon Phi class processors with AVX512F, AVX512CD, AVX512ER and
AVX512PF.  A capability, avx512_1, is also added to x86-64 for AVX512
ISAs: AVX512F, AVX512CD, AVX512BW, AVX512DQ and AVX512VL.

	[BZ #21391]
	* sysdeps/i386/dl-machine.h (dl_platform_init) [IS_IN (rtld)]:
	Only call init_cpu_features.
	[!IS_IN (rtld)]: Only set GLRO(dl_platform) to NULL if needed.
	* sysdeps/x86_64/dl-machine.h (dl_platform_init): Likewise.
	* sysdeps/i386/dl-procinfo.h: Removed.
	* sysdeps/unix/sysv/linux/i386/dl-procinfo.h: Don't include
	<sysdeps/i386/dl-procinfo.h> nor <ldsodefs.h>.  Include
	<sysdeps/x86/dl-procinfo.h>.
	(_dl_procinfo): Replace _DL_HWCAP_COUNT with 32.
	* sysdeps/unix/sysv/linux/x86_64/dl-procinfo.h [!IS_IN (ldconfig)]:
	Include <sysdeps/x86/dl-procinfo.h> instead of
	 <sysdeps/generic/dl-procinfo.h>.
	* sysdeps/x86/cpu-features.c: Include <dl-hwcap.h>.
	(init_cpu_features): Set dl_platform, dl_hwcap and dl_hwcap_mask.
	* sysdeps/x86/cpu-features.h (bit_cpu_LZCNT): New.
	(bit_cpu_MOVBE): Likewise.
	(bit_cpu_BMI1): Likewise.
	(bit_cpu_BMI2): Likewise.
	(index_cpu_BMI1): Likewise.
	(index_cpu_BMI2): Likewise.
	(index_cpu_LZCNT): Likewise.
	(index_cpu_MOVBE): Likewise.
	(index_cpu_POPCNT): Likewise.
	(reg_BMI1): Likewise.
	(reg_BMI2): Likewise.
	(reg_LZCNT): Likewise.
	(reg_MOVBE): Likewise.
	(reg_POPCNT): Likewise.
	* sysdeps/x86/dl-hwcap.h: New file.
	* sysdeps/x86/dl-procinfo.h: Likewise.
	* sysdeps/x86/dl-procinfo.c (_dl_x86_hwcap_flags): New.
	(_dl_x86_platforms): Likewise.

1 files changed, 15 insertions, 0 deletions

diff --git a/sysdeps/x86/cpu-features.h b/sysdeps/x86/cpu-features.h
index 85a39e7..31c7c80 100644
--- a/sysdeps/x86/cpu-features.h
+++ b/sysdeps/x86/cpu-features.h
@@ -57,8 +57,13 @@
 #define bit_cpu_FMA		(1 << 12)
 #define bit_cpu_FMA4		(1 << 16)
 #define bit_cpu_HTT		(1 << 28)
+#define bit_cpu_LZCNT		(1 << 5)
+#define bit_cpu_MOVBE		(1 << 22)
+#define bit_cpu_POPCNT		(1 << 23)
 
 /* COMMON_CPUID_INDEX_7.  */
+#define bit_cpu_BMI1		(1 << 3)
+#define bit_cpu_BMI2		(1 << 8)
 #define bit_cpu_ERMS		(1 << 9)
 #define bit_cpu_RTM		(1 << 11)
 #define bit_cpu_AVX2		(1 << 5)
@@ -258,6 +263,11 @@ extern const struct cpu_features *__get_cpu_features (void)
 # define index_cpu_POPCOUNT	COMMON_CPUID_INDEX_1
 # define index_cpu_OSXSAVE	COMMON_CPUID_INDEX_1
 # define index_cpu_HTT		COMMON_CPUID_INDEX_1
+# define index_cpu_BMI1		COMMON_CPUID_INDEX_7
+# define index_cpu_BMI2		COMMON_CPUID_INDEX_7
+# 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 reg_CX8		edx
 # define reg_CMOV		edx
@@ -282,6 +292,11 @@ extern const struct cpu_features *__get_cpu_features (void)
 # define reg_POPCOUNT		ecx
 # define reg_OSXSAVE		ecx
 # define reg_HTT		edx
+# define reg_BMI1		ebx
+# define reg_BMI2		ebx
+# define reg_LZCNT		ecx
+# define reg_MOVBE		ecx
+# define reg_POPCNT		ecx
 
 # define index_arch_Fast_Rep_String	FEATURE_INDEX_1
 # define index_arch_Fast_Copy_Backward	FEATURE_INDEX_1