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GNU C Library master sources branch rsa/hwcap2_v3 created. glibc-2.17-590-g1da1702

From: rsa at sourceware dot org
To: glibc-cvs at sourceware dot org
Date: 3 May 2013 19:16:05 -0000
Subject: GNU C Library master sources branch rsa/hwcap2_v3 created. glibc-2.17-590-g1da1702
This is an automated email from the git hooks/post-receive script. It was
generated because a ref change was pushed to the repository containing
the project "GNU C Library master sources".

The branch, rsa/hwcap2_v3 has been created
        at  1da1702d0c3996db36d44f007d7deebb7e637c08 (commit)

- Log -----------------------------------------------------------------
http://sourceware.org/git/gitweb.cgi?p=glibc.git;a=commitdiff;h=1da1702d0c3996db36d44f007d7deebb7e637c08

commit 1da1702d0c3996db36d44f007d7deebb7e637c08
Author: Ryan S. Arnold <rsa@linux.vnet.ibm.com>
Date:   Fri May 3 14:14:40 2013 -0500

    Add support for AT_HWCAP2.

diff --git a/ChangeLog b/ChangeLog
index cd846f9..02904aa 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,20 @@
+2013-05-03  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.
+
 2013-05-01  Roland McGrath  <roland@hack.frob.com>
 
 	* sysdeps/posix/opendir.c: Include <sys/param.h> to get MIN/MAX macros.
diff --git a/elf/dl-support.c b/elf/dl-support.c
index 7a55b82..a8cebc2 100644
--- a/elf/dl-support.c
+++ b/elf/dl-support.c
@@ -193,6 +193,10 @@ _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)
@@ -211,8 +215,12 @@ _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;
@@ -251,6 +259,9 @@ _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 d8f3dd2..832a57b 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)
     {
@@ -298,6 +307,7 @@ _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);
 
@@ -309,10 +319,12 @@ _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 4ad4f39..b473a0e 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 4321e37..0d69922 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 9a77d27..91ec847 100644
--- a/ports/ChangeLog.alpha
+++ b/ports/ChangeLog.alpha
@@ -1,3 +1,8 @@
+2013-05-03  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 9bd3aad..fb43486 100644
--- a/ports/ChangeLog.arm
+++ b/ports/ChangeLog.arm
@@ -1,3 +1,8 @@
+2013-05-03  Ryan S. Arnold  <rsa@linux.vnet.ibm.com>
+
+	* sysdeps/unix/sysv/linux/arm/dl-procinfo.h (_dl_procinfo): Add
+	nop support for AT_HWCAP2.
+
 2013-04-19  Roland McGrath  <roland@hack.frob.com>
 
 	* sysdeps/arm/sysdep.h
diff --git a/ports/ChangeLog.mips b/ports/ChangeLog.mips
index b221512..2c96a3d 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.
+
 2013-04-02  Thomas Schwinge  <thomas@codesourcery.com>
 
 	* sysdeps/mips/math_private.h: New file.
diff --git a/ports/ChangeLog.powerpc b/ports/ChangeLog.powerpc
index 2ba8e37..c787da6 100644
--- a/ports/ChangeLog.powerpc
+++ b/ports/ChangeLog.powerpc
@@ -1,3 +1,8 @@
+2013-05-03  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 523d966..0344dbc 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 5cc9a44..e96550c 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 b45465c..a9d98d3 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 161e86c..1f3a8ce 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 90c87d9..a184a59 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 883fa7f..233a325 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 19aa93b..ca20732 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 717f6f9..45e27f1 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 a18b099..57a250f 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 a82f8f5..745b556 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 5ca4b76..9e9e3dc 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)

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