File dl-runtime-resolve-xsave.patch of Package glibc

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File dl-runtime-resolve-xsave.patch of Package glibc

2017-10-22  H.J. Lu  <hongjiu.lu@intel.com>

[BZ #21265]
	* sysdeps/x86/cpu-features-offsets.sym (XSAVE_STATE_SIZE_OFFSET):
	New.
	* sysdeps/x86/cpu-features.c: Include <libc-pointer-arith.h>.
	(get_common_indeces): Set xsave_state_size, xsave_state_full_size
	and bit_arch_XSAVEC_Usable if needed.
	(init_cpu_features): Remove bit_arch_Use_dl_runtime_resolve_slow
	and bit_arch_Use_dl_runtime_resolve_opt.
	* sysdeps/x86/cpu-features.h (bit_arch_Use_dl_runtime_resolve_opt):
	Removed.
	(bit_arch_Use_dl_runtime_resolve_slow): Likewise.
	(bit_arch_Prefer_No_AVX512): Updated.
	(bit_arch_MathVec_Prefer_No_AVX512): Likewise.
	(bit_arch_XSAVEC_Usable): New.
	(STATE_SAVE_OFFSET): Likewise.
	(STATE_SAVE_MASK): Likewise.
	[__ASSEMBLER__]: Include <cpu-features-offsets.h>.
	(cpu_features): Add xsave_state_size and xsave_state_full_size.
	(index_arch_Use_dl_runtime_resolve_opt): Removed.
	(index_arch_Use_dl_runtime_resolve_slow): Likewise.
	(index_arch_XSAVEC_Usable): New.
	* sysdeps/x86/cpu-tunables.c (TUNABLE_CALLBACK (set_hwcaps)):
	Support XSAVEC_Usable.  Remove Use_dl_runtime_resolve_slow.
	* sysdeps/x86_64/Makefile (tst-x86_64-1-ENV): New if tunables
	is enabled.
	* sysdeps/x86_64/dl-machine.h (elf_machine_runtime_setup):
	Replace _dl_runtime_resolve_sse, _dl_runtime_resolve_avx,
	_dl_runtime_resolve_avx_slow, _dl_runtime_resolve_avx_opt,
	_dl_runtime_resolve_avx512 and _dl_runtime_resolve_avx512_opt
	with _dl_runtime_resolve_fxsave, _dl_runtime_resolve_xsave and
	_dl_runtime_resolve_xsavec.
	* sysdeps/x86_64/dl-trampoline.S (DL_RUNTIME_UNALIGNED_VEC_SIZE):
	Removed.
	(DL_RUNTIME_RESOLVE_REALIGN_STACK): Check STATE_SAVE_ALIGNMENT
	instead of VEC_SIZE.
	(REGISTER_SAVE_BND0): Removed.
	(REGISTER_SAVE_BND1): Likewise.
	(REGISTER_SAVE_BND3): Likewise.
	(REGISTER_SAVE_RAX): Always defined to 0.
	(VMOV): Removed.
	(_dl_runtime_resolve_avx): Likewise.
	(_dl_runtime_resolve_avx_slow): Likewise.
	(_dl_runtime_resolve_avx_opt): Likewise.
	(_dl_runtime_resolve_avx512): Likewise.
	(_dl_runtime_resolve_avx512_opt): Likewise.
	(_dl_runtime_resolve_sse): Likewise.
	(_dl_runtime_resolve_sse_vex): Likewise.
	(USE_FXSAVE): New.
	(_dl_runtime_resolve_fxsave): Likewise.
	(USE_XSAVE): Likewise.
	(_dl_runtime_resolve_xsave): Likewise.
	(USE_XSAVEC): Likewise.
	(_dl_runtime_resolve_xsavec): Likewise.
	* sysdeps/x86_64/dl-trampoline.h (_dl_runtime_resolve_avx512):
	Removed.
	(_dl_runtime_resolve_avx512_opt): Likewise.
	(_dl_runtime_resolve_avx): Likewise.
	(_dl_runtime_resolve_avx_opt): Likewise.
	(_dl_runtime_resolve_sse): Likewise.
	(_dl_runtime_resolve_sse_vex): Likewise.
	(_dl_runtime_resolve_fxsave): New.
	(_dl_runtime_resolve_xsave): Likewise.
	(_dl_runtime_resolve_xsavec): Likewise.

Index: glibc-2.26/sysdeps/x86/cpu-features-offsets.sym
===================================================================
--- glibc-2.26.orig/sysdeps/x86/cpu-features-offsets.sym
+++ glibc-2.26/sysdeps/x86/cpu-features-offsets.sym
@@ -15,6 +15,7 @@ CPUID_ECX_OFFSET	offsetof (struct cpuid_
 CPUID_EDX_OFFSET	offsetof (struct cpuid_registers, edx)
 FAMILY_OFFSET		offsetof (struct cpu_features, family)
 MODEL_OFFSET		offsetof (struct cpu_features, model)
+XSAVE_STATE_SIZE_OFFSET	offsetof (struct cpu_features, xsave_state_size)
 FEATURE_OFFSET		offsetof (struct cpu_features, feature)
 FEATURE_SIZE		sizeof (unsigned int)
 
Index: glibc-2.26/sysdeps/x86/cpu-features.c
===================================================================
--- glibc-2.26.orig/sysdeps/x86/cpu-features.c
+++ glibc-2.26/sysdeps/x86/cpu-features.c
@@ -19,6 +19,7 @@
 #include <cpuid.h>
 #include <cpu-features.h>
 #include <dl-hwcap.h>
+#include <libc-pointer-arith.h>
 
 #if HAVE_TUNABLES
 # define TUNABLE_NAMESPACE tune
@@ -103,6 +104,76 @@ get_common_indeces (struct cpu_features
 		}
 	    }
 	}
+
+      /* For _dl_runtime_resolve, set xsave_state_size to xsave area
+	 size + integer register save size and align it to 64 bytes.  */
+      if (cpu_features->max_cpuid >= 0xd)
+	{
+	  unsigned int eax, ebx, ecx, edx;
+
+	  __cpuid_count (0xd, 0, eax, ebx, ecx, edx);
+	  if (ebx != 0)
+	    {
+	      unsigned int xsave_state_full_size
+		= ALIGN_UP (ebx + STATE_SAVE_OFFSET, 64);
+
+	      cpu_features->xsave_state_size
+		= xsave_state_full_size;
+	      cpu_features->xsave_state_full_size
+		= xsave_state_full_size;
+
+	      __cpuid_count (0xd, 1, eax, ebx, ecx, edx);
+
+	      /* Check if XSAVEC is available.  */
+	      if ((eax & (1 << 1)) != 0)
+		{
+		  unsigned int xstate_comp_offsets[32];
+		  unsigned int xstate_comp_sizes[32];
+		  unsigned int i;
+
+		  xstate_comp_offsets[0] = 0;
+		  xstate_comp_offsets[1] = 160;
+		  xstate_comp_offsets[2] = 576;
+		  xstate_comp_sizes[0] = 160;
+		  xstate_comp_sizes[1] = 256;
+
+		  for (i = 2; i < 32; i++)
+		    {
+		      if ((STATE_SAVE_MASK & (1 << i)) != 0)
+			{
+			  __cpuid_count (0xd, i, eax, ebx, ecx, edx);
+			  xstate_comp_sizes[i] = eax;
+			}
+		      else
+			{
+			  ecx = 0;
+			  xstate_comp_sizes[i] = 0;
+			}
+
+		      if (i > 2)
+			{
+			  xstate_comp_offsets[i]
+			    = (xstate_comp_offsets[i - 1]
+			       + xstate_comp_sizes[i -1]);
+			  if ((ecx & (1 << 1)) != 0)
+			    xstate_comp_offsets[i]
+			      = ALIGN_UP (xstate_comp_offsets[i], 64);
+			}
+		    }
+
+		  /* Use XSAVEC.  */
+		  unsigned int size
+		    = xstate_comp_offsets[31] + xstate_comp_sizes[31];
+		  if (size)
+		    {
+		      cpu_features->xsave_state_size
+			= ALIGN_UP (size + STATE_SAVE_OFFSET, 64);
+		      cpu_features->feature[index_arch_XSAVEC_Usable]
+			|= bit_arch_XSAVEC_Usable;
+		    }
+		}
+	    }
+	}
     }
 }
 
@@ -242,23 +313,6 @@ init_cpu_features (struct cpu_features *
       else
 	cpu_features->feature[index_arch_Prefer_No_AVX512]
 	  |= bit_arch_Prefer_No_AVX512;
-
-      /* To avoid SSE transition penalty, use _dl_runtime_resolve_slow.
-         If XGETBV suports ECX == 1, use _dl_runtime_resolve_opt.
-	 Use _dl_runtime_resolve_opt only with AVX512F since it is
-	 slower than _dl_runtime_resolve_slow with AVX.  */
-      cpu_features->feature[index_arch_Use_dl_runtime_resolve_slow]
-	|= bit_arch_Use_dl_runtime_resolve_slow;
-      if (CPU_FEATURES_ARCH_P (cpu_features, AVX512F_Usable)
-	  && cpu_features->max_cpuid >= 0xd)
-	{
-	  unsigned int eax;
-
-	  __cpuid_count (0xd, 1, eax, ebx, ecx, edx);
-	  if ((eax & (1 << 2)) != 0)
-	    cpu_features->feature[index_arch_Use_dl_runtime_resolve_opt]
-	      |= bit_arch_Use_dl_runtime_resolve_opt;
-	}
     }
   /* This spells out "AuthenticAMD".  */
   else if (ebx == 0x68747541 && ecx == 0x444d4163 && edx == 0x69746e65)
Index: glibc-2.26/sysdeps/x86/cpu-features.h
===================================================================
--- glibc-2.26.orig/sysdeps/x86/cpu-features.h
+++ glibc-2.26/sysdeps/x86/cpu-features.h
@@ -37,9 +37,8 @@
 #define bit_arch_Prefer_No_VZEROUPPER		(1 << 17)
 #define bit_arch_Fast_Unaligned_Copy		(1 << 18)
 #define bit_arch_Prefer_ERMS			(1 << 19)
-#define bit_arch_Use_dl_runtime_resolve_opt	(1 << 20)
-#define bit_arch_Use_dl_runtime_resolve_slow	(1 << 21)
-#define bit_arch_Prefer_No_AVX512		(1 << 22)
+#define bit_arch_Prefer_No_AVX512		(1 << 20)
+#define bit_arch_XSAVEC_Usable			(1 << 21)
 
 /* CPUID Feature flags.  */
 
@@ -88,6 +87,15 @@
 /* The current maximum size of the feature integer bit array.  */
 #define FEATURE_INDEX_MAX 1
 
+/* Offset for fxsave/xsave area used by _dl_runtime_resolve.  Also need
+   space to preserve RCX, RDX, RSI, RDI, R8, R9 and RAX.  It must be
+   aligned to 16 bytes for fxsave and 64 bytes for xsave.  */
+#define STATE_SAVE_OFFSET (8 * 7 + 8)
+
+/* Save SSE, AVX, AVX512, mask and bound registers.  */
+#define STATE_SAVE_MASK \
+  ((1 << 1) | (1 << 2) | (1 << 3) | (1 << 5) | (1 << 6) | (1 << 7))
+
 #ifdef	__ASSEMBLER__
 
 # include <cpu-features-offsets.h>
@@ -123,8 +131,6 @@
 # define index_arch_Prefer_No_VZEROUPPER FEATURE_INDEX_1*FEATURE_SIZE
 # define index_arch_Fast_Unaligned_Copy	FEATURE_INDEX_1*FEATURE_SIZE
 # define index_arch_Prefer_ERMS		FEATURE_INDEX_1*FEATURE_SIZE
-# define index_arch_Use_dl_runtime_resolve_opt FEATURE_INDEX_1*FEATURE_SIZE
-# define index_arch_Use_dl_runtime_resolve_slow FEATURE_INDEX_1*FEATURE_SIZE
 # define index_arch_Prefer_No_AVX512	FEATURE_INDEX_1*FEATURE_SIZE
 
 
@@ -214,6 +220,18 @@ struct cpu_features
   } cpuid[COMMON_CPUID_INDEX_MAX];
   unsigned int family;
   unsigned int model;
+  /* The state size for XSAVEC or XSAVE.  The type must be unsigned long
+     int so that we use
+
+	sub xsave_state_size_offset(%rip) %RSP_LP
+
+     in _dl_runtime_resolve.  */
+  unsigned long int xsave_state_size;
+  /* The full state size for XSAVE when XSAVEC is disabled by
+
+     GLIBC_TUNABLES=glibc.tune.hwcaps=-XSAVEC_Usable
+   */
+  unsigned int xsave_state_full_size;
   unsigned int feature[FEATURE_INDEX_MAX];
   /* Data cache size for use in memory and string routines, typically
      L1 size.  */
@@ -326,9 +344,8 @@ extern const struct cpu_features *__get_
 # define index_arch_Prefer_No_VZEROUPPER FEATURE_INDEX_1
 # define index_arch_Fast_Unaligned_Copy	FEATURE_INDEX_1
 # define index_arch_Prefer_ERMS		FEATURE_INDEX_1
-# define index_arch_Use_dl_runtime_resolve_opt FEATURE_INDEX_1
-# define index_arch_Use_dl_runtime_resolve_slow FEATURE_INDEX_1
 # define index_arch_Prefer_No_AVX512	FEATURE_INDEX_1
+# define index_arch_XSAVEC_Usable	FEATURE_INDEX_1
 
 #endif	/* !__ASSEMBLER__ */
 
Index: glibc-2.26/sysdeps/x86/cpu-tunables.c
===================================================================
--- glibc-2.26.orig/sysdeps/x86/cpu-tunables.c
+++ glibc-2.26/sysdeps/x86/cpu-tunables.c
@@ -240,6 +240,16 @@ TUNABLE_CALLBACK (set_hwcaps) (tunable_v
 						Slow_SSE4_2, SSE4_2,
 						disable, 11);
 	  break;
+	case 13:
+	  if (disable)
+	    {
+	      /* Update xsave_state_size to XSAVE state size.  */
+	      cpu_features->xsave_state_size
+		= cpu_features->xsave_state_full_size;
+	      CHECK_GLIBC_IFUNC_ARCH_OFF (n, cpu_features,
+					  XSAVEC_Usable, 13);
+	    }
+	  break;
 	case 14:
 	  if (disable)
 	    {
@@ -308,13 +318,6 @@ TUNABLE_CALLBACK (set_hwcaps) (tunable_v
 		 disable, 26);
 	    }
 	  break;
-	case 27:
-	    {
-	      CHECK_GLIBC_IFUNC_ARCH_BOTH (n, cpu_features,
-					   Use_dl_runtime_resolve_slow,
-					   disable, 27);
-	    }
-	  break;
 	}
       p += len + 1;
     }
Index: glibc-2.26/sysdeps/x86_64/Makefile
===================================================================
--- glibc-2.26.orig/sysdeps/x86_64/Makefile
+++ glibc-2.26/sysdeps/x86_64/Makefile
@@ -55,6 +55,10 @@ CFLAGS-tst-quad2pie.c = $(PIE-ccflag)
 tests += tst-x86_64-1
 modules-names += x86_64/tst-x86_64mod-1
 LDFLAGS-tst-x86_64mod-1.so = -Wl,-soname,tst-x86_64mod-1.so
+ifneq (no,$(have-tunables))
+# Test the state size for XSAVE when XSAVEC is disabled.
+tst-x86_64-1-ENV = GLIBC_TUNABLES=glibc.tune.hwcaps=-XSAVEC_Usable
+endif
 
 $(objpfx)tst-x86_64-1: $(objpfx)x86_64/tst-x86_64mod-1.so
 
Index: glibc-2.26/sysdeps/x86_64/dl-machine.h
===================================================================
--- glibc-2.26.orig/sysdeps/x86_64/dl-machine.h
+++ glibc-2.26/sysdeps/x86_64/dl-machine.h
@@ -66,12 +66,9 @@ static inline int __attribute__ ((unused
 elf_machine_runtime_setup (struct link_map *l, int lazy, int profile)
 {
   Elf64_Addr *got;
-  extern void _dl_runtime_resolve_sse (ElfW(Word)) attribute_hidden;
-  extern void _dl_runtime_resolve_avx (ElfW(Word)) attribute_hidden;
-  extern void _dl_runtime_resolve_avx_slow (ElfW(Word)) attribute_hidden;
-  extern void _dl_runtime_resolve_avx_opt (ElfW(Word)) attribute_hidden;
-  extern void _dl_runtime_resolve_avx512 (ElfW(Word)) attribute_hidden;
-  extern void _dl_runtime_resolve_avx512_opt (ElfW(Word)) attribute_hidden;
+  extern void _dl_runtime_resolve_fxsave (ElfW(Word)) attribute_hidden;
+  extern void _dl_runtime_resolve_xsave (ElfW(Word)) attribute_hidden;
+  extern void _dl_runtime_resolve_xsavec (ElfW(Word)) attribute_hidden;
   extern void _dl_runtime_profile_sse (ElfW(Word)) attribute_hidden;
   extern void _dl_runtime_profile_avx (ElfW(Word)) attribute_hidden;
   extern void _dl_runtime_profile_avx512 (ElfW(Word)) attribute_hidden;
@@ -120,29 +117,14 @@ elf_machine_runtime_setup (struct link_m
 	  /* This function will get called to fix up the GOT entry
 	     indicated by the offset on the stack, and then jump to
 	     the resolved address.  */
-	  if (HAS_ARCH_FEATURE (AVX512F_Usable))
-	    {
-	      if (HAS_ARCH_FEATURE (Use_dl_runtime_resolve_opt))
-		*(ElfW(Addr) *) (got + 2)
-		  = (ElfW(Addr)) &_dl_runtime_resolve_avx512_opt;
-	      else
-		*(ElfW(Addr) *) (got + 2)
-		  = (ElfW(Addr)) &_dl_runtime_resolve_avx512;
-	    }
-	  else if (HAS_ARCH_FEATURE (AVX_Usable))
-	    {
-	      if (HAS_ARCH_FEATURE (Use_dl_runtime_resolve_opt))
-		*(ElfW(Addr) *) (got + 2)
-		  = (ElfW(Addr)) &_dl_runtime_resolve_avx_opt;
-	      else if (HAS_ARCH_FEATURE (Use_dl_runtime_resolve_slow))
-		*(ElfW(Addr) *) (got + 2)
-		  = (ElfW(Addr)) &_dl_runtime_resolve_avx_slow;
-	      else
-		*(ElfW(Addr) *) (got + 2)
-		  = (ElfW(Addr)) &_dl_runtime_resolve_avx;
-	    }
+	  if (GLRO(dl_x86_cpu_features).xsave_state_size != 0)
+	    *(ElfW(Addr) *) (got + 2)
+	      = (HAS_ARCH_FEATURE (XSAVEC_Usable)
+		 ? (ElfW(Addr)) &_dl_runtime_resolve_xsavec
+		 : (ElfW(Addr)) &_dl_runtime_resolve_xsave);
 	  else
-	    *(ElfW(Addr) *) (got + 2) = (ElfW(Addr)) &_dl_runtime_resolve_sse;
+	    *(ElfW(Addr) *) (got + 2)
+	      = (ElfW(Addr)) &_dl_runtime_resolve_fxsave;
 	}
     }
 
Index: glibc-2.26/sysdeps/x86_64/dl-trampoline.S
===================================================================
--- glibc-2.26.orig/sysdeps/x86_64/dl-trampoline.S
+++ glibc-2.26/sysdeps/x86_64/dl-trampoline.S
@@ -34,41 +34,24 @@
 # define DL_STACK_ALIGNMENT 8
 #endif
 
-#ifndef DL_RUNTIME_UNALIGNED_VEC_SIZE
-/* The maximum size in bytes of unaligned vector load and store in the
-   dynamic linker.  Since SSE optimized memory/string functions with
-   aligned SSE register load and store are used in the dynamic linker,
-   we must set this to 8 so that _dl_runtime_resolve_sse will align the
-   stack before calling _dl_fixup.  */
-# define DL_RUNTIME_UNALIGNED_VEC_SIZE 8
-#endif
-
-/* True if _dl_runtime_resolve should align stack to VEC_SIZE bytes.  */
+/* True if _dl_runtime_resolve should align stack for STATE_SAVE or align
+   stack to 16 bytes before calling _dl_fixup.  */
 #define DL_RUNTIME_RESOLVE_REALIGN_STACK \
-  (VEC_SIZE > DL_STACK_ALIGNMENT \
-   && VEC_SIZE > DL_RUNTIME_UNALIGNED_VEC_SIZE)
-
-/* Align vector register save area to 16 bytes.  */
-#define REGISTER_SAVE_VEC_OFF	0
+  (STATE_SAVE_ALIGNMENT > DL_STACK_ALIGNMENT \
+   || 16 > DL_STACK_ALIGNMENT)
 
 /* Area on stack to save and restore registers used for parameter
    passing when calling _dl_fixup.  */
 #ifdef __ILP32__
-# define REGISTER_SAVE_RAX	(REGISTER_SAVE_VEC_OFF + VEC_SIZE * 8)
 # define PRESERVE_BND_REGS_PREFIX
 #else
-/* Align bound register save area to 16 bytes.  */
-# define REGISTER_SAVE_BND0	(REGISTER_SAVE_VEC_OFF + VEC_SIZE * 8)
-# define REGISTER_SAVE_BND1	(REGISTER_SAVE_BND0 + 16)
-# define REGISTER_SAVE_BND2	(REGISTER_SAVE_BND1 + 16)
-# define REGISTER_SAVE_BND3	(REGISTER_SAVE_BND2 + 16)
-# define REGISTER_SAVE_RAX	(REGISTER_SAVE_BND3 + 16)
 # ifdef HAVE_MPX_SUPPORT
 #  define PRESERVE_BND_REGS_PREFIX bnd
 # else
 #  define PRESERVE_BND_REGS_PREFIX .byte 0xf2
 # endif
 #endif
+#define REGISTER_SAVE_RAX	0
 #define REGISTER_SAVE_RCX	(REGISTER_SAVE_RAX + 8)
 #define REGISTER_SAVE_RDX	(REGISTER_SAVE_RCX + 8)
 #define REGISTER_SAVE_RSI	(REGISTER_SAVE_RDX + 8)
@@ -80,68 +63,56 @@
 
 #define VEC_SIZE		64
 #define VMOVA			vmovdqa64
-#if DL_RUNTIME_RESOLVE_REALIGN_STACK || VEC_SIZE <= DL_STACK_ALIGNMENT
-# define VMOV			vmovdqa64
-#else
-# define VMOV			vmovdqu64
-#endif
 #define VEC(i)			zmm##i
-#define _dl_runtime_resolve	_dl_runtime_resolve_avx512
 #define _dl_runtime_profile	_dl_runtime_profile_avx512
 #include "dl-trampoline.h"
-#undef _dl_runtime_resolve
 #undef _dl_runtime_profile
 #undef VEC
-#undef VMOV
 #undef VMOVA
 #undef VEC_SIZE
 
 #define VEC_SIZE		32
 #define VMOVA			vmovdqa
-#if DL_RUNTIME_RESOLVE_REALIGN_STACK || VEC_SIZE <= DL_STACK_ALIGNMENT
-# define VMOV			vmovdqa
-#else
-# define VMOV			vmovdqu
-#endif
 #define VEC(i)			ymm##i
-#define _dl_runtime_resolve	_dl_runtime_resolve_avx
-#define _dl_runtime_resolve_opt	_dl_runtime_resolve_avx_opt
 #define _dl_runtime_profile	_dl_runtime_profile_avx
 #include "dl-trampoline.h"
-#undef _dl_runtime_resolve
-#undef _dl_runtime_resolve_opt
 #undef _dl_runtime_profile
 #undef VEC
-#undef VMOV
 #undef VMOVA
 #undef VEC_SIZE
 
 /* movaps/movups is 1-byte shorter.  */
 #define VEC_SIZE		16
 #define VMOVA			movaps
-#if DL_RUNTIME_RESOLVE_REALIGN_STACK || VEC_SIZE <= DL_STACK_ALIGNMENT
-# define VMOV			movaps
-#else
-# define VMOV			movups
-#endif
 #define VEC(i)			xmm##i
-#define _dl_runtime_resolve	_dl_runtime_resolve_sse
 #define _dl_runtime_profile	_dl_runtime_profile_sse
 #undef RESTORE_AVX
 #include "dl-trampoline.h"
-#undef _dl_runtime_resolve
 #undef _dl_runtime_profile
-#undef VMOV
+#undef VEC
 #undef VMOVA
+#undef VEC_SIZE
 
-/* Used by _dl_runtime_resolve_avx_opt/_dl_runtime_resolve_avx512_opt
-   to preserve the full vector registers with zero upper bits.  */
-#define VMOVA			vmovdqa
-#if DL_RUNTIME_RESOLVE_REALIGN_STACK || VEC_SIZE <= DL_STACK_ALIGNMENT
-# define VMOV			vmovdqa
-#else
-# define VMOV			vmovdqu
-#endif
-#define _dl_runtime_resolve	_dl_runtime_resolve_sse_vex
-#define _dl_runtime_resolve_opt	_dl_runtime_resolve_avx512_opt
+#define USE_FXSAVE
+#define STATE_SAVE_ALIGNMENT	16
+#define _dl_runtime_resolve	_dl_runtime_resolve_fxsave
+#include "dl-trampoline.h"
+#undef _dl_runtime_resolve
+#undef USE_FXSAVE
+#undef STATE_SAVE_ALIGNMENT
+
+#define USE_XSAVE
+#define STATE_SAVE_ALIGNMENT	64
+#define _dl_runtime_resolve	_dl_runtime_resolve_xsave
+#include "dl-trampoline.h"
+#undef _dl_runtime_resolve
+#undef USE_XSAVE
+#undef STATE_SAVE_ALIGNMENT
+
+#define USE_XSAVEC
+#define STATE_SAVE_ALIGNMENT	64
+#define _dl_runtime_resolve	_dl_runtime_resolve_xsavec
 #include "dl-trampoline.h"
+#undef _dl_runtime_resolve
+#undef USE_XSAVEC
+#undef STATE_SAVE_ALIGNMENT
Index: glibc-2.26/sysdeps/x86_64/dl-trampoline.h
===================================================================
--- glibc-2.26.orig/sysdeps/x86_64/dl-trampoline.h
+++ glibc-2.26/sysdeps/x86_64/dl-trampoline.h
@@ -16,140 +16,47 @@
    License along with the GNU C Library; if not, see
    <http://www.gnu.org/licenses/>.  */
 
-#undef REGISTER_SAVE_AREA_RAW
-#ifdef __ILP32__
-/* X32 saves RCX, RDX, RSI, RDI, R8 and R9 plus RAX as well as VEC0 to
-   VEC7.  */
-# define REGISTER_SAVE_AREA_RAW	(8 * 7 + VEC_SIZE * 8)
-#else
-/* X86-64 saves RCX, RDX, RSI, RDI, R8 and R9 plus RAX as well as
-   BND0, BND1, BND2, BND3 and VEC0 to VEC7. */
-# define REGISTER_SAVE_AREA_RAW	(8 * 7 + 16 * 4 + VEC_SIZE * 8)
-#endif
+	.text
+#ifdef _dl_runtime_resolve
 
-#undef REGISTER_SAVE_AREA
-#undef LOCAL_STORAGE_AREA
-#undef BASE
-#if DL_RUNTIME_RESOLVE_REALIGN_STACK
-# define REGISTER_SAVE_AREA	(REGISTER_SAVE_AREA_RAW + 8)
-/* Local stack area before jumping to function address: RBX.  */
-# define LOCAL_STORAGE_AREA	8
-# define BASE			rbx
-# if (REGISTER_SAVE_AREA % VEC_SIZE) != 0
-#  error REGISTER_SAVE_AREA must be multples of VEC_SIZE
-# endif
-#else
-# define REGISTER_SAVE_AREA	REGISTER_SAVE_AREA_RAW
-/* Local stack area before jumping to function address:  All saved
-   registers.  */
-# define LOCAL_STORAGE_AREA	REGISTER_SAVE_AREA
-# define BASE			rsp
-# if (REGISTER_SAVE_AREA % 16) != 8
-#  error REGISTER_SAVE_AREA must be odd multples of 8
-# endif
-#endif
+# undef REGISTER_SAVE_AREA
+# undef LOCAL_STORAGE_AREA
+# undef BASE
 
-	.text
-#ifdef _dl_runtime_resolve_opt
-/* Use the smallest vector registers to preserve the full YMM/ZMM
-   registers to avoid SSE transition penalty.  */
+# if (STATE_SAVE_ALIGNMENT % 16) != 0
+#  error STATE_SAVE_ALIGNMENT must be multples of 16
+# endif
 
-# if VEC_SIZE == 32
-/* Check if the upper 128 bits in %ymm0 - %ymm7 registers are non-zero
-   and preserve %xmm0 - %xmm7 registers with the zero upper bits.  Since
-   there is no SSE transition penalty on AVX512 processors which don't
-   support XGETBV with ECX == 1, _dl_runtime_resolve_avx512_slow isn't
-   provided.   */
-	.globl _dl_runtime_resolve_avx_slow
-	.hidden _dl_runtime_resolve_avx_slow
-	.type _dl_runtime_resolve_avx_slow, @function
-	.align 16
-_dl_runtime_resolve_avx_slow:
-	cfi_startproc
-	cfi_adjust_cfa_offset(16) # Incorporate PLT
-	vorpd %ymm0, %ymm1, %ymm8
-	vorpd %ymm2, %ymm3, %ymm9
-	vorpd %ymm4, %ymm5, %ymm10
-	vorpd %ymm6, %ymm7, %ymm11
-	vorpd %ymm8, %ymm9, %ymm9
-	vorpd %ymm10, %ymm11, %ymm10
-	vpcmpeqd %xmm8, %xmm8, %xmm8
-	vorpd %ymm9, %ymm10, %ymm10
-	vptest %ymm10, %ymm8
-	# Preserve %ymm0 - %ymm7 registers if the upper 128 bits of any
-	# %ymm0 - %ymm7 registers aren't zero.
-	PRESERVE_BND_REGS_PREFIX
-	jnc _dl_runtime_resolve_avx
-	# Use vzeroupper to avoid SSE transition penalty.
-	vzeroupper
-	# Preserve %xmm0 - %xmm7 registers with the zero upper 128 bits
-	# when the upper 128 bits of %ymm0 - %ymm7 registers are zero.
-	PRESERVE_BND_REGS_PREFIX
-	jmp _dl_runtime_resolve_sse_vex
-	cfi_adjust_cfa_offset(-16) # Restore PLT adjustment
-	cfi_endproc
-	.size _dl_runtime_resolve_avx_slow, .-_dl_runtime_resolve_avx_slow
+# if (STATE_SAVE_OFFSET % STATE_SAVE_ALIGNMENT) != 0
+#  error STATE_SAVE_OFFSET must be multples of STATE_SAVE_ALIGNMENT
 # endif
 
-/* Use XGETBV with ECX == 1 to check which bits in vector registers are
-   non-zero and only preserve the non-zero lower bits with zero upper
-   bits.  */
-	.globl _dl_runtime_resolve_opt
-	.hidden _dl_runtime_resolve_opt
-	.type _dl_runtime_resolve_opt, @function
-	.align 16
-_dl_runtime_resolve_opt:
-	cfi_startproc
-	cfi_adjust_cfa_offset(16) # Incorporate PLT
-	pushq %rax
-	cfi_adjust_cfa_offset(8)
-	cfi_rel_offset(%rax, 0)
-	pushq %rcx
-	cfi_adjust_cfa_offset(8)
-	cfi_rel_offset(%rcx, 0)
-	pushq %rdx
-	cfi_adjust_cfa_offset(8)
-	cfi_rel_offset(%rdx, 0)
-	movl $1, %ecx
-	xgetbv
-	movl %eax, %r11d
-	popq %rdx
-	cfi_adjust_cfa_offset(-8)
-	cfi_restore (%rdx)
-	popq %rcx
-	cfi_adjust_cfa_offset(-8)
-	cfi_restore (%rcx)
-	popq %rax
-	cfi_adjust_cfa_offset(-8)
-	cfi_restore (%rax)
-# if VEC_SIZE == 32
-	# For YMM registers, check if YMM state is in use.
-	andl $bit_YMM_state, %r11d
-	# Preserve %xmm0 - %xmm7 registers with the zero upper 128 bits if
-	# YMM state isn't in use.
-	PRESERVE_BND_REGS_PREFIX
-	jz _dl_runtime_resolve_sse_vex
-# elif VEC_SIZE == 16
-	# For ZMM registers, check if YMM state and ZMM state are in
-	# use.
-	andl $(bit_YMM_state | bit_ZMM0_15_state), %r11d
-	cmpl $bit_YMM_state, %r11d
-	# Preserve %zmm0 - %zmm7 registers if ZMM state is in use.
-	PRESERVE_BND_REGS_PREFIX
-	jg _dl_runtime_resolve_avx512
-	# Preserve %ymm0 - %ymm7 registers with the zero upper 256 bits if
-	# ZMM state isn't in use.
-	PRESERVE_BND_REGS_PREFIX
-	je _dl_runtime_resolve_avx
-	# Preserve %xmm0 - %xmm7 registers with the zero upper 384 bits if
-	# neither YMM state nor ZMM state are in use.
+# if DL_RUNTIME_RESOLVE_REALIGN_STACK
+/* Local stack area before jumping to function address: RBX.  */
+#  define LOCAL_STORAGE_AREA	8
+#  define BASE			rbx
+#  ifdef USE_FXSAVE
+/* Use fxsave to save XMM registers.  */
+#   define REGISTER_SAVE_AREA	(512 + STATE_SAVE_OFFSET)
+#   if (REGISTER_SAVE_AREA % 16) != 0
+#    error REGISTER_SAVE_AREA must be multples of 16
+#   endif
+#  endif
 # else
-#  error Unsupported VEC_SIZE!
+#  ifndef USE_FXSAVE
+#   error USE_FXSAVE must be defined
+#  endif
+/* Use fxsave to save XMM registers.  */
+#  define REGISTER_SAVE_AREA	(512 + STATE_SAVE_OFFSET + 8)
+/* Local stack area before jumping to function address:  All saved
+   registers.  */
+#  define LOCAL_STORAGE_AREA	REGISTER_SAVE_AREA
+#  define BASE			rsp
+#  if (REGISTER_SAVE_AREA % 16) != 8
+#   error REGISTER_SAVE_AREA must be odd multples of 8
+#  endif
 # endif
-	cfi_adjust_cfa_offset(-16) # Restore PLT adjustment
-	cfi_endproc
-	.size _dl_runtime_resolve_opt, .-_dl_runtime_resolve_opt
-#endif
+
 	.globl _dl_runtime_resolve
 	.hidden _dl_runtime_resolve
 	.type _dl_runtime_resolve, @function
@@ -157,21 +64,30 @@ _dl_runtime_resolve_opt:
 	cfi_startproc
 _dl_runtime_resolve:
 	cfi_adjust_cfa_offset(16) # Incorporate PLT
-#if DL_RUNTIME_RESOLVE_REALIGN_STACK
-# if LOCAL_STORAGE_AREA != 8
-#  error LOCAL_STORAGE_AREA must be 8
-# endif
+# if DL_RUNTIME_RESOLVE_REALIGN_STACK
+#  if LOCAL_STORAGE_AREA != 8
+#   error LOCAL_STORAGE_AREA must be 8
+#  endif
 	pushq %rbx			# push subtracts stack by 8.
 	cfi_adjust_cfa_offset(8)
 	cfi_rel_offset(%rbx, 0)
 	mov %RSP_LP, %RBX_LP
 	cfi_def_cfa_register(%rbx)
-	and $-VEC_SIZE, %RSP_LP
-#endif
+	and $-STATE_SAVE_ALIGNMENT, %RSP_LP
+# endif
+# ifdef REGISTER_SAVE_AREA
 	sub $REGISTER_SAVE_AREA, %RSP_LP
-#if !DL_RUNTIME_RESOLVE_REALIGN_STACK
+#  if !DL_RUNTIME_RESOLVE_REALIGN_STACK
 	cfi_adjust_cfa_offset(REGISTER_SAVE_AREA)
-#endif
+#  endif
+# else
+	# Allocate stack space of the required size to save the state.
+#  if IS_IN (rtld)
+	sub _rtld_local_ro+RTLD_GLOBAL_RO_DL_X86_CPU_FEATURES_OFFSET+XSAVE_STATE_SIZE_OFFSET(%rip), %RSP_LP
+#  else
+	sub _dl_x86_cpu_features+XSAVE_STATE_SIZE_OFFSET(%rip), %RSP_LP
+#  endif
+# endif
 	# Preserve registers otherwise clobbered.
 	movq %rax, REGISTER_SAVE_RAX(%rsp)
 	movq %rcx, REGISTER_SAVE_RCX(%rsp)
@@ -180,59 +96,42 @@ _dl_runtime_resolve:
 	movq %rdi, REGISTER_SAVE_RDI(%rsp)
 	movq %r8, REGISTER_SAVE_R8(%rsp)
 	movq %r9, REGISTER_SAVE_R9(%rsp)
-	VMOV %VEC(0), (REGISTER_SAVE_VEC_OFF)(%rsp)
-	VMOV %VEC(1), (REGISTER_SAVE_VEC_OFF + VEC_SIZE)(%rsp)
-	VMOV %VEC(2), (REGISTER_SAVE_VEC_OFF + VEC_SIZE * 2)(%rsp)
-	VMOV %VEC(3), (REGISTER_SAVE_VEC_OFF + VEC_SIZE * 3)(%rsp)
-	VMOV %VEC(4), (REGISTER_SAVE_VEC_OFF + VEC_SIZE * 4)(%rsp)
-	VMOV %VEC(5), (REGISTER_SAVE_VEC_OFF + VEC_SIZE * 5)(%rsp)
-	VMOV %VEC(6), (REGISTER_SAVE_VEC_OFF + VEC_SIZE * 6)(%rsp)
-	VMOV %VEC(7), (REGISTER_SAVE_VEC_OFF + VEC_SIZE * 7)(%rsp)
-#ifndef __ILP32__
-	# We also have to preserve bound registers.  These are nops if
-	# Intel MPX isn't available or disabled.
-# ifdef HAVE_MPX_SUPPORT
-	bndmov %bnd0, REGISTER_SAVE_BND0(%rsp)
-	bndmov %bnd1, REGISTER_SAVE_BND1(%rsp)
-	bndmov %bnd2, REGISTER_SAVE_BND2(%rsp)
-	bndmov %bnd3, REGISTER_SAVE_BND3(%rsp)
+# ifdef USE_FXSAVE
+	fxsave STATE_SAVE_OFFSET(%rsp)
 # else
-#  if REGISTER_SAVE_BND0 == 0
-	.byte 0x66,0x0f,0x1b,0x04,0x24
+	movl $STATE_SAVE_MASK, %eax
+	xorl %edx, %edx
+	# Clear the XSAVE Header.
+#  ifdef USE_XSAVE
+	movq %rdx, (STATE_SAVE_OFFSET + 512)(%rsp)
+	movq %rdx, (STATE_SAVE_OFFSET + 512 + 8)(%rsp)
+#  endif
+	movq %rdx, (STATE_SAVE_OFFSET + 512 + 8 * 2)(%rsp)
+	movq %rdx, (STATE_SAVE_OFFSET + 512 + 8 * 3)(%rsp)
+	movq %rdx, (STATE_SAVE_OFFSET + 512 + 8 * 4)(%rsp)
+	movq %rdx, (STATE_SAVE_OFFSET + 512 + 8 * 5)(%rsp)
+	movq %rdx, (STATE_SAVE_OFFSET + 512 + 8 * 6)(%rsp)
+	movq %rdx, (STATE_SAVE_OFFSET + 512 + 8 * 7)(%rsp)
+#  ifdef USE_XSAVE
+	xsave STATE_SAVE_OFFSET(%rsp)
 #  else
-	.byte 0x66,0x0f,0x1b,0x44,0x24,REGISTER_SAVE_BND0
+	xsavec STATE_SAVE_OFFSET(%rsp)
 #  endif
-	.byte 0x66,0x0f,0x1b,0x4c,0x24,REGISTER_SAVE_BND1
-	.byte 0x66,0x0f,0x1b,0x54,0x24,REGISTER_SAVE_BND2
-	.byte 0x66,0x0f,0x1b,0x5c,0x24,REGISTER_SAVE_BND3
 # endif
-#endif
 	# Copy args pushed by PLT in register.
 	# %rdi: link_map, %rsi: reloc_index
 	mov (LOCAL_STORAGE_AREA + 8)(%BASE), %RSI_LP
 	mov LOCAL_STORAGE_AREA(%BASE), %RDI_LP
 	call _dl_fixup		# Call resolver.
 	mov %RAX_LP, %R11_LP	# Save return value
-#ifndef __ILP32__
-	# Restore bound registers.  These are nops if Intel MPX isn't
-	# avaiable or disabled.
-# ifdef HAVE_MPX_SUPPORT
-	bndmov REGISTER_SAVE_BND3(%rsp), %bnd3
-	bndmov REGISTER_SAVE_BND2(%rsp), %bnd2
-	bndmov REGISTER_SAVE_BND1(%rsp), %bnd1
-	bndmov REGISTER_SAVE_BND0(%rsp), %bnd0
+	# Get register content back.
+# ifdef USE_FXSAVE
+	fxrstor STATE_SAVE_OFFSET(%rsp)
 # else
-	.byte 0x66,0x0f,0x1a,0x5c,0x24,REGISTER_SAVE_BND3
-	.byte 0x66,0x0f,0x1a,0x54,0x24,REGISTER_SAVE_BND2
-	.byte 0x66,0x0f,0x1a,0x4c,0x24,REGISTER_SAVE_BND1
-#  if REGISTER_SAVE_BND0 == 0
-	.byte 0x66,0x0f,0x1a,0x04,0x24
-#  else
-	.byte 0x66,0x0f,0x1a,0x44,0x24,REGISTER_SAVE_BND0
-#  endif
+	movl $STATE_SAVE_MASK, %eax
+	xorl %edx, %edx
+	xrstor STATE_SAVE_OFFSET(%rsp)
 # endif
-#endif
-	# Get register content back.
 	movq REGISTER_SAVE_R9(%rsp), %r9
 	movq REGISTER_SAVE_R8(%rsp), %r8
 	movq REGISTER_SAVE_RDI(%rsp), %rdi
@@ -240,20 +139,12 @@ _dl_runtime_resolve:
 	movq REGISTER_SAVE_RDX(%rsp), %rdx
 	movq REGISTER_SAVE_RCX(%rsp), %rcx
 	movq REGISTER_SAVE_RAX(%rsp), %rax
-	VMOV (REGISTER_SAVE_VEC_OFF)(%rsp), %VEC(0)
-	VMOV (REGISTER_SAVE_VEC_OFF + VEC_SIZE)(%rsp), %VEC(1)
-	VMOV (REGISTER_SAVE_VEC_OFF + VEC_SIZE * 2)(%rsp), %VEC(2)
-	VMOV (REGISTER_SAVE_VEC_OFF + VEC_SIZE * 3)(%rsp), %VEC(3)
-	VMOV (REGISTER_SAVE_VEC_OFF + VEC_SIZE * 4)(%rsp), %VEC(4)
-	VMOV (REGISTER_SAVE_VEC_OFF + VEC_SIZE * 5)(%rsp), %VEC(5)
-	VMOV (REGISTER_SAVE_VEC_OFF + VEC_SIZE * 6)(%rsp), %VEC(6)
-	VMOV (REGISTER_SAVE_VEC_OFF + VEC_SIZE * 7)(%rsp), %VEC(7)
-#if DL_RUNTIME_RESOLVE_REALIGN_STACK
+# if DL_RUNTIME_RESOLVE_REALIGN_STACK
 	mov %RBX_LP, %RSP_LP
 	cfi_def_cfa_register(%rsp)
 	movq (%rsp), %rbx
 	cfi_restore(%rbx)
-#endif
+# endif
 	# Adjust stack(PLT did 2 pushes)
 	add $(LOCAL_STORAGE_AREA + 16), %RSP_LP
 	cfi_adjust_cfa_offset(-(LOCAL_STORAGE_AREA + 16))
@@ -262,11 +153,9 @@ _dl_runtime_resolve:
 	jmp *%r11		# Jump to function address.
 	cfi_endproc
 	.size _dl_runtime_resolve, .-_dl_runtime_resolve
+#endif
 
 
-/* To preserve %xmm0 - %xmm7 registers, dl-trampoline.h is included
-   twice, for _dl_runtime_resolve_sse and _dl_runtime_resolve_sse_vex.
-   But we don't need another _dl_runtime_profile for XMM registers.  */
 #if !defined PROF && defined _dl_runtime_profile
 # if (LR_VECTOR_OFFSET % VEC_SIZE) != 0
 #  error LR_VECTOR_OFFSET must be multples of VEC_SIZE

Places

File dl-runtime-resolve-xsave.patch of Package glibc

Places