Add support for AT_HWCAP2.

20 files changed, 147 insertions, 23 deletions

diff --git a/ChangeLog b/ChangeLog
index 1fe59a3d5e..56f8d11521 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,5 +1,22 @@
 2013-05-16  Ryan S. Arnold  <rsa@linux.vnet.ibm.com>
 
+	* elf/dl-support.c (_dl_aux_init): Add support for AT_HWCAP2.
+	* elf/dl-sysdep.c (_dl_sysdep_start, _dl_show_auxv): Likewise.
+	* misc/getauxval.c (__getauxval): Likewise.
+	* sysdeps/powerpc/dl-procinfo.h (_dl_procinfo): Add support for
+	displaying AT_HWCAP2 strings.
+	* elf/elf.h [AT_HWCAP2]: Add a new a_type entry.
+	* sysdeps/s390/dl-procinfo.h (_dl_procinfo): Add 'type' parameter for
+	AT_HWCAP2 support.
+	* sysdeps/i386/dl-procinfo.h: Likewise.
+	* sysdeps/generic/dl-procinfo.h: Likewise.
+	* sysdeps/unix/sysv/linux/s390/dl-procinfo.h: (_dl_procinfo): Add
+	nop support for AT_HWCAP2.
+	* sysdeps/unix/sysv/linux/i386/dl-procinfo.h: Likewise.
+	* sysdeps/sparc/dl-procinfo.h: Likewise.
+
+2013-05-16  Ryan S. Arnold  <rsa@linux.vnet.ibm.com>
+
 	* crypt/sha512-block.c: Add missing #include <stdint.h> due to
 	uint64_t or uint32_t usage.
 	* crypt/sha256-block.c: Likewise.
diff --git a/elf/dl-support.c b/elf/dl-support.c
index b3ab9560ad..ed8000023d 100644
--- a/elf/dl-support.c
+++ b/elf/dl-support.c
@@ -194,6 +194,10 @@ _dl_aux_init (ElfW(auxv_t) *av)
   uid_t uid = 0;
   gid_t gid = 0;
 
+  /* Don't rely on a specific order of AT_HWCAP and AT_HWCAP2.  Collate into a
+     zeroed temp and assign to _dl_hwcap after the auxv has been parsed.  */
+  uint64_t hwcap = 0;
+
   _dl_auxv = av;
   for (; av->a_type != AT_NULL; ++av)
     switch (av->a_type)
@@ -212,8 +216,12 @@ _dl_aux_init (ElfW(auxv_t) *av)
 	GL(dl_phnum) = av->a_un.a_val;
 	break;
       case AT_HWCAP:
-	GLRO(dl_hwcap) = (unsigned long int) av->a_un.a_val;
+	hwcap |= (unsigned long int) av->a_un.a_val;
+	break;
+      case AT_HWCAP2:
+	hwcap |= ((uint64_t) av->a_un.a_val) << 32;
 	break;
+
 #ifdef NEED_DL_SYSINFO
       case AT_SYSINFO:
 	GL(dl_sysinfo) = av->a_un.a_val;
@@ -252,6 +260,9 @@ _dl_aux_init (ElfW(auxv_t) *av)
       DL_PLATFORM_AUXV
 # endif
       }
+
+  GLRO(dl_hwcap) = hwcap;
+
   if (seen == 0xf)
     {
       __libc_enable_secure = uid != 0 || gid != 0;
diff --git a/elf/dl-sysdep.c b/elf/dl-sysdep.c
index 52de23f44b..6fdcb13145 100644
--- a/elf/dl-sysdep.c
+++ b/elf/dl-sysdep.c
@@ -107,6 +107,10 @@ _dl_sysdep_start (void **start_argptr,
   uintptr_t new_sysinfo = 0;
 #endif
 
+  /* Don't rely on a specific order of AT_HWCAP and AT_HWCAP2.  Collate into a
+     zeroed temp and assign to _dl_hwcap after the auxv has been parsed.  */
+  uint64_t hwcap = 0;
+
   __libc_stack_end = DL_STACK_END (start_argptr);
   DL_FIND_ARG_COMPONENTS (start_argptr, _dl_argc, INTUSE(_dl_argv), _environ,
 			  GLRO(dl_auxv));
@@ -154,7 +158,10 @@ _dl_sysdep_start (void **start_argptr,
 	GLRO(dl_platform) = (void *) av->a_un.a_val;
 	break;
       case AT_HWCAP:
-	GLRO(dl_hwcap) = (unsigned long int) av->a_un.a_val;
+	hwcap |= (unsigned long int) av->a_un.a_val;
+	break;
+      case AT_HWCAP2:
+	hwcap |= ((uint64_t) av->a_un.a_val) << 32;
 	break;
       case AT_CLKTCK:
 	GLRO(dl_clktck) = av->a_un.a_val;
@@ -180,6 +187,8 @@ _dl_sysdep_start (void **start_argptr,
 #endif
       }
 
+  GLRO(dl_hwcap) = hwcap;
+
 #ifndef HAVE_AUX_SECURE
   if (seen != -1)
     {
@@ -303,6 +312,7 @@ _dl_show_auxv (void)
 	  [AT_SYSINFO - 2] =		{ "SYSINFO:      0x", hex },
 	  [AT_SYSINFO_EHDR - 2] =	{ "SYSINFO_EHDR: 0x", hex },
 	  [AT_RANDOM - 2] =		{ "RANDOM:       0x", hex },
+	  [AT_HWCAP2 - 2] =		{ "HWCAP2:       ", hex },
 	};
       unsigned int idx = (unsigned int) (av->a_type - 2);
 
@@ -314,10 +324,12 @@ _dl_show_auxv (void)
       assert (AT_NULL == 0);
       assert (AT_IGNORE == 1);
 
-      if (av->a_type == AT_HWCAP)
+      if (av->a_type == AT_HWCAP || av->a_type == AT_HWCAP2)
 	{
-	  /* This is handled special.  */
-	  if (_dl_procinfo (av->a_un.a_val) == 0)
+	  /* HWCAP bits are translated into representative strings, per
+	     platform.  */
+	  if (_dl_procinfo (av->a_type, av->a_un.a_val) == 0)
+
 	    continue;
 	}
 
diff --git a/elf/elf.h b/elf/elf.h
index 4ad4f39999..b473a0ebd5 100644
--- a/elf/elf.h
+++ b/elf/elf.h
@@ -1015,6 +1015,9 @@ typedef struct
 
 #define AT_RANDOM	25		/* Address of 16 random bytes.  */
 
+#define AT_HWCAP2	26		/* Extended machine dependent hints
+					   about processor capabilities.  */
+
 #define AT_EXECFN	31		/* Filename of executable.  */
 
 /* Pointer to the global system page used for system calls and other
diff --git a/misc/getauxval.c b/misc/getauxval.c
index 4321e3718a..0d699229f6 100644
--- a/misc/getauxval.c
+++ b/misc/getauxval.c
@@ -26,6 +26,8 @@ __getauxval (unsigned long int type)
 
   if (type == AT_HWCAP)
     return GLRO(dl_hwcap);
+  else if (type == AT_HWCAP2)
+    return GLRO(dl_hwcap) >> 32;
 
   for (p = GLRO(dl_auxv); p->a_type != AT_NULL; p++)
     if (p->a_type == type)
diff --git a/ports/ChangeLog.alpha b/ports/ChangeLog.alpha
index 9a77d276ab..70f9df0126 100644
--- a/ports/ChangeLog.alpha
+++ b/ports/ChangeLog.alpha
@@ -1,3 +1,8 @@
+2013-05-16  Ryan S. Arnold  <rsa@linux.vnet.ibm.com>
+
+	* sysdeps/alpha/dl-procinfo.h (_dl_procinfo): Add 'type' parameter for
+	AT_HWCAP2 support.
+
 2013-03-06  Andreas Jaeger  <aj@suse.de>
 
 	* sysdeps/unix/sysv/linux/alpha/bits/mman.h (MAP_HUGE_MASK)
diff --git a/ports/ChangeLog.arm b/ports/ChangeLog.arm
index 81b2a56eee..c7437c9e0d 100644
--- a/ports/ChangeLog.arm
+++ b/ports/ChangeLog.arm
@@ -1,5 +1,10 @@
 2013-05-16  Ryan S. Arnold  <rsa@linux.vnet.ibm.com>
 
+	* sysdeps/unix/sysv/linux/arm/dl-procinfo.h (_dl_procinfo): Add
+	nop support for AT_HWCAP2.
+
+2013-05-16  Ryan S. Arnold  <rsa@linux.vnet.ibm.com>
+
 	* sysdeps/unix/sysv/linux/arm/bits/atomic.h: Add missing #include
 	<stdint.h> due to uint64_t or uint32_t usage.
 
diff --git a/ports/ChangeLog.mips b/ports/ChangeLog.mips
index 472ae21fb2..158f82366e 100644
--- a/ports/ChangeLog.mips
+++ b/ports/ChangeLog.mips
@@ -1,3 +1,8 @@
+2013-05-03  Ryan S. Arnold  <rsa@linux.vnet.ibm.com>
+
+	* sysdeps/mips/dl-procinfo.h (_dl_procinfo): Add 'type' parameter for
+	AT_HWCAP2 support.
+
 2013-05-16  Ryan S. Arnold  <rsa@linux.vnet.ibm.com>
 
 	* sysdeps/unix/sysv/linux/mips/kernel_rt_sigframe.h: Add missing
diff --git a/ports/ChangeLog.powerpc b/ports/ChangeLog.powerpc
index 2ba8e3754f..345df7b239 100644
--- a/ports/ChangeLog.powerpc
+++ b/ports/ChangeLog.powerpc
@@ -1,3 +1,8 @@
+2013-05-16  Ryan S. Arnold  <rsa@linux.vnet.ibm.com>
+
+	* sysdeps/powerpc/dl-procinfo.h (_dl_procinfo): Add support for
+	displaying AT_HWCAP2 strings.
+
 2013-02-28  Joseph Myers  <joseph@codesourcery.com>
 
 	[BZ #13550]
diff --git a/ports/sysdeps/alpha/dl-procinfo.h b/ports/sysdeps/alpha/dl-procinfo.h
index 523d966761..0344dbc968 100644
--- a/ports/sysdeps/alpha/dl-procinfo.h
+++ b/ports/sysdeps/alpha/dl-procinfo.h
@@ -51,7 +51,7 @@ _dl_string_platform (const char *str)
 };
 
 /* We cannot provide a general printing function.  */
-#define _dl_procinfo(word) -1
+#define _dl_procinfo(type, word) -1
 
 /* There are no hardware capabilities defined.  */
 #define _dl_hwcap_string(idx) ""
diff --git a/ports/sysdeps/mips/dl-procinfo.h b/ports/sysdeps/mips/dl-procinfo.h
index 5cc9a44446..e96550c402 100644
--- a/ports/sysdeps/mips/dl-procinfo.h
+++ b/ports/sysdeps/mips/dl-procinfo.h
@@ -51,7 +51,7 @@ _dl_string_platform (const char *str)
 };
 
 /* We cannot provide a general printing function.  */
-#define _dl_procinfo(word) -1
+#define _dl_procinfo(type, word) -1
 
 /* There are no hardware capabilities defined.  */
 #define _dl_hwcap_string(idx) ""
diff --git a/ports/sysdeps/powerpc/dl-procinfo.h b/ports/sysdeps/powerpc/dl-procinfo.h
index b45465c3dd..a9d98d34ef 100644
--- a/ports/sysdeps/powerpc/dl-procinfo.h
+++ b/ports/sysdeps/powerpc/dl-procinfo.h
@@ -19,6 +19,7 @@
 #ifndef _DL_PROCINFO_H
 #define _DL_PROCINFO_H 1
 
+#include <stdint.h>
 #include <ldsodefs.h>
 #include <sysdep.h>            /* This defines the PPC_FEATURE_* macros.  */
 
@@ -153,19 +154,40 @@ _dl_string_platform (const char *str)
 }
 
 #ifdef IS_IN_rtld
+
 static inline int
 __attribute__ ((unused))
-_dl_procinfo (int word)
+_dl_procinfo (unsigned int type, int word)
 {
-  _dl_printf ("AT_HWCAP:       ");
+  unsigned int first, count, str_offset;
 
-  for (int i = _DL_HWCAP_FIRST; i < _DL_HWCAP_COUNT; ++i)
+  switch(type)
+    {
+    case AT_HWCAP:
+      _dl_printf ("AT_HWCAP:       ");
+      first = _DL_HWCAP_FIRST;
+      count = MIN(_DL_HWCAP_COUNT,_DL_HWCAP2_FIRST);
+      str_offset = 0;
+      break;
+    case AT_HWCAP2:
+      _dl_printf ("AT_HWCAP2:      ");
+      first = 0;
+      count = _DL_HWCAP_COUNT - _DL_HWCAP2_FIRST;
+      str_offset = _DL_HWCAP2_FIRST;
+      break;
+    default:
+      /* This should not happen.  */
+      return -1;
+    }
+
+  for (int i = first; i < count; ++i)
     if (word & (1 << i))
-      _dl_printf (" %s", _dl_hwcap_string (i));
+      _dl_printf (" %s", _dl_hwcap_string (str_offset + i));
 
   _dl_printf ("\n");
 
   return 0;
+
 }
 #endif
 
diff --git a/ports/sysdeps/unix/sysv/linux/arm/dl-procinfo.h b/ports/sysdeps/unix/sysv/linux/arm/dl-procinfo.h
index 161e86c796..1f3a8ceb50 100644
--- a/ports/sysdeps/unix/sysv/linux/arm/dl-procinfo.h
+++ b/ports/sysdeps/unix/sysv/linux/arm/dl-procinfo.h
@@ -31,10 +31,14 @@
 
 static inline int
 __attribute__ ((unused))
-_dl_procinfo (int word)
+_dl_procinfo (unsigned int type, int word)
 {
   int i;
 
+  /* Unused for now.  */
+  if (type == AT_HWCAP2)
+    return 0;
+
   _dl_printf ("AT_HWCAP:   ");
 
   for (i = 0; i < _DL_HWCAP_COUNT; ++i)
diff --git a/sysdeps/generic/dl-procinfo.h b/sysdeps/generic/dl-procinfo.h
index 90c87d942a..a184a5918a 100644
--- a/sysdeps/generic/dl-procinfo.h
+++ b/sysdeps/generic/dl-procinfo.h
@@ -21,7 +21,7 @@
 #define _DL_PROCINFO_H	1
 
 /* We cannot provide a general printing function.  */
-#define _dl_procinfo(word) -1
+#define _dl_procinfo(type, word) -1
 
 /* There are no hardware capabilities defined.  */
 #define _dl_hwcap_string(idx) ""
diff --git a/sysdeps/i386/dl-procinfo.h b/sysdeps/i386/dl-procinfo.h
index 883fa7f0ab..233a3257e3 100644
--- a/sysdeps/i386/dl-procinfo.h
+++ b/sysdeps/i386/dl-procinfo.h
@@ -61,7 +61,7 @@ enum
 };
 
 /* We cannot provide a general printing function.  */
-#define _dl_procinfo(word) -1
+#define _dl_procinfo(type, word) -1
 
 static inline const char *
 __attribute__ ((unused))
diff --git a/sysdeps/powerpc/dl-procinfo.h b/sysdeps/powerpc/dl-procinfo.h
index 19aa93b185..ca20732571 100644
--- a/sysdeps/powerpc/dl-procinfo.h
+++ b/sysdeps/powerpc/dl-procinfo.h
@@ -22,8 +22,9 @@
 #include <ldsodefs.h>
 #include <sysdep.h>		/* This defines the PPC_FEATURE_* macros.  */
 
-/* There are 25 bits used, but they are bits 7..31.  */
+/* There are 25 bits used in AT_HWCAP, but they are bits 7..31.  */
 #define _DL_HWCAP_FIRST		7
+#define _DL_HWCAP2_FIRST	32
 #define _DL_HWCAP_COUNT		32
 
 /* These bits influence library search.  */
@@ -133,15 +134,35 @@ _dl_string_platform (const char *str)
 }
 
 #ifdef IS_IN_rtld
+
 static inline int
 __attribute__ ((unused))
-_dl_procinfo (int word)
+_dl_procinfo (unsigned int type, int word)
 {
-  _dl_printf ("AT_HWCAP:       ");
+  unsigned int first, count, str_offset;
 
-  for (int i = _DL_HWCAP_FIRST; i < _DL_HWCAP_COUNT; ++i)
+  switch(type)
+    {
+    case AT_HWCAP:
+      _dl_printf ("AT_HWCAP:       ");
+      first = _DL_HWCAP_FIRST;
+      count = MIN(_DL_HWCAP_COUNT,_DL_HWCAP2_FIRST);
+      str_offset = 0;
+      break;
+    case AT_HWCAP2:
+      _dl_printf ("AT_HWCAP2:      ");
+      first = 0;
+      count = _DL_HWCAP_COUNT - _DL_HWCAP2_FIRST;
+      str_offset = _DL_HWCAP2_FIRST;
+      break;
+    default:
+      /* This should not happen.  */
+      return -1;
+    }
+
+  for (int i = first; i < count; ++i)
     if (word & (1 << i))
-      _dl_printf (" %s", _dl_hwcap_string (i));
+      _dl_printf (" %s", _dl_hwcap_string (str_offset + i));
 
   _dl_printf ("\n");
 
diff --git a/sysdeps/s390/dl-procinfo.h b/sysdeps/s390/dl-procinfo.h
index 717f6f9a50..45e27f1023 100644
--- a/sysdeps/s390/dl-procinfo.h
+++ b/sysdeps/s390/dl-procinfo.h
@@ -56,7 +56,7 @@ enum
 			  | HWCAP_S390_EIMM | HWCAP_S390_DFP)
 
 /* We cannot provide a general printing function.  */
-#define _dl_procinfo(word) -1
+#define _dl_procinfo(type, word) -1
 
 static inline const char *
 __attribute__ ((unused))
diff --git a/sysdeps/sparc/dl-procinfo.h b/sysdeps/sparc/dl-procinfo.h
index a18b099586..57a250f7f3 100644
--- a/sysdeps/sparc/dl-procinfo.h
+++ b/sysdeps/sparc/dl-procinfo.h
@@ -27,10 +27,14 @@
 
 static inline int
 __attribute__ ((unused))
-_dl_procinfo (int word)
+_dl_procinfo (unsigned int type, int word)
 {
   int i;
 
+  /* Unused for now.  */
+  if (type == AT_HWCAP2)
+    return 0;
+
   _dl_printf ("AT_HWCAP:   ");
 
   for (i = 0; i < _DL_HWCAP_COUNT; ++i)
diff --git a/sysdeps/unix/sysv/linux/i386/dl-procinfo.h b/sysdeps/unix/sysv/linux/i386/dl-procinfo.h
index a82f8f5b8d..745b556f24 100644
--- a/sysdeps/unix/sysv/linux/i386/dl-procinfo.h
+++ b/sysdeps/unix/sysv/linux/i386/dl-procinfo.h
@@ -24,12 +24,16 @@
 #undef _dl_procinfo
 static inline int
 __attribute__ ((unused))
-_dl_procinfo (int word)
+_dl_procinfo (unsigned int type, int word)
 {
   /* This table should match the information from arch/i386/kernel/setup.c
      in the kernel sources.  */
   int i;
 
+  /* Unused for now.  */
+  if (type == AT_HWCAP2)
+    return 0;
+
   _dl_printf ("AT_HWCAP:   ");
 
   for (i = 0; i < _DL_HWCAP_COUNT; ++i)
diff --git a/sysdeps/unix/sysv/linux/s390/dl-procinfo.h b/sysdeps/unix/sysv/linux/s390/dl-procinfo.h
index 5ca4b76ca7..9e9e3dc4f1 100644
--- a/sysdeps/unix/sysv/linux/s390/dl-procinfo.h
+++ b/sysdeps/unix/sysv/linux/s390/dl-procinfo.h
@@ -24,12 +24,16 @@
 #undef _dl_procinfo
 static inline int
 __attribute__ ((unused))
-_dl_procinfo (int word)
+_dl_procinfo (unsigned int type, int word)
 {
   /* This table should match the information from arch/s390/kernel/setup.c
      in the kernel sources.  */
   int i;
 
+  /* Unused for now.  */
+  if (type == AT_HWCAP2)
+    return 0;
+
   _dl_printf ("AT_HWCAP:   ");
 
   for (i = 0; i < _DL_HWCAP_COUNT; ++i)