Add GLRO(dl_hwcap2), conditional on per platform HWCAP2_AVAIL.

ChangeLog

@@ -1,3 +1,34 @@
+2013-06-27  Ryan S. Arnold  <rsa@linux.vnet.ibm.com>
+
+	* elf/dl-support.c (_dl_hwcap2): Add a new hwcap field for more
+	hardware capabilities, conditional on HWCAP2_AVAIL.
+	(_dl_aux_init): Read AT_HWCAP2 into GLRO(dl_hwcap2), conditional on
+	HWCAP2_AVAIL.
+	* elf/dl-sysdep.c (_dl_sysdep_start): Read AT_HWCAP2 into
+	GLRO(dl_hwcap2), conditional on HWCAP2_AVAIL.
+	(_dl_show_auxv): Add support for calling _dl_procinfo when AT_HWCAP2
+	is encountered conditional on HWCAP2_AVAIL such that the default
+	mechanism is used otherwise.
+	* misc/getauxval.c (__getauxval): Return GLRO(dl_hwcap2) on AT_HWCAP2,
+	conditional on HWCAP2_AVAIL.
+	* sysdeps/generic/ldsodefs.h (rtld_global_ro): Add _dl_hwcap2 as a new
+	struct member, conditional on HWCAP2_AVAIL.
+	* sysdeps/generic/dl-hwcap2.h: New file defining HWCAP2_AVAIL as 0.
+	* ports/sysdeps/alpha/dl-procinfo.h (_dl_procinfo): Add TYPE parameter
+	to macro prototype for AT_HWCAP2 support.
+	* ports/sysdeps/mips/dl-procinfo.h: Likewise.
+	* sysdeps/generic/dl-procinfo.h: Likewise.
+	* sysdeps/i386/dl-procinfo.h: Likewise.
+	* sysdeps/s390/dl-procinfo.h: Likewise.
+	* ports/sysdeps/unix/sysv/linux/arm/dl-procinfo.h (_dl_procinfo): Add
+	TYPE parameter to macro prototype for AT_HWCAP2 support.  Make WORD
+	unsigned long int rather than signed int.  Stub in case for TYPE ==
+	AT_HWCAP2.
+	* sysdeps/powerpc/dl-procinfo.h: Likewise.
+	* sysdeps/sparc/dl-procinfo.h: Likewise.
+	* sysdeps/unix/sysv/linux/i386/dl-procinfo.h: Likewise.
+	* sysdeps/unix/sysv/linux/s390/dl-procinfo.h: Likewise.
+
 2013-06-26  Joseph Myers  <joseph@codesourcery.com>
 
 	* configure.in (CC): Require GCC version 4.4 or later.

elf/dl-support.c

@@ -31,6 +31,7 @@
 #include <dl-cache.h>
 #include <dl-librecon.h>
 #include <dl-procinfo.h>
+#include <dl-hwcap2.h>
 #include <unsecvars.h>
 #include <hp-timing.h>
 #include <stackinfo.h>
@@ -131,6 +132,10 @@ const ElfW(Phdr) *_dl_phdr;
 size_t _dl_phnum;
 uint64_t _dl_hwcap __attribute__ ((nocommon));
 
+#if HWCAP2_AVAIL
+uint64_t _dl_hwcap2 __attribute__ ((nocommon));
+#endif
+
 /* This is not initialized to HWCAP_IMPORTANT, matching the definition
    of _dl_important_hwcaps, below, where no hwcap strings are ever
    used.  This mask is still used to mediate the lookups in the cache
@@ -214,6 +219,11 @@ _dl_aux_init (ElfW(auxv_t) *av)
       case AT_HWCAP:
 	GLRO(dl_hwcap) = (unsigned long int) av->a_un.a_val;
 	break;
+#if HWCAP2_AVAIL
+      case AT_HWCAP2:
+	GLRO(dl_hwcap2) = (unsigned long int) av->a_un.a_val;
+	break;
+#endif
 #ifdef NEED_DL_SYSINFO
       case AT_SYSINFO:
 	GL(dl_sysinfo) = av->a_un.a_val;

elf/dl-sysdep.c

@@ -43,6 +43,7 @@
 #include <dl-osinfo.h>
 #include <hp-timing.h>
 #include <tls.h>
+#include <dl-hwcap2.h>
 
 extern char **_environ attribute_hidden;
 extern char _end[] attribute_hidden;
@@ -156,6 +157,11 @@ _dl_sysdep_start (void **start_argptr,
       case AT_HWCAP:
 	GLRO(dl_hwcap) = (unsigned long int) av->a_un.a_val;
 	break;
+#if HWCAP2_AVAIL
+      case AT_HWCAP2:
+	GLRO(dl_hwcap2) = (unsigned long int) av->a_un.a_val;
+	break;
+#endif
       case AT_CLKTCK:
 	GLRO(dl_clktck) = av->a_un.a_val;
 	break;
@@ -303,6 +309,7 @@ _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:       0x", hex },
 	};
       unsigned int idx = (unsigned int) (av->a_type - 2);
 
@@ -314,10 +321,14 @@ _dl_show_auxv (void)
       assert (AT_NULL == 0);
       assert (AT_IGNORE == 1);
 
+#if HWCAP2_AVAIL
+      if (av->a_type == AT_HWCAP || av->a_type == AT_HWCAP2)
+#else
       if (av->a_type == AT_HWCAP)
+#endif
 	{
-	  /* This is handled special.  */
-	  if (_dl_procinfo (av->a_un.a_val) == 0)
+	  /* These are handled in a special way per platform.  */
+	  if (_dl_procinfo (av->a_type, av->a_un.a_val) == 0)
 	    continue;
 	}
 

misc/getauxval.c

@@ -17,7 +17,7 @@
 
 #include <sys/auxv.h>
 #include <ldsodefs.h>
-
+#include <dl-hwcap2.h>
 
 unsigned long int
 __getauxval (unsigned long int type)
@@ -26,6 +26,10 @@ __getauxval (unsigned long int type)
 
   if (type == AT_HWCAP)
     return GLRO(dl_hwcap);
+#if HWCAP2_AVAIL
+  else if (type == AT_HWCAP2)
+    return GLRO(dl_hwcap2);
+#endif
 
   for (p = GLRO(dl_auxv); p->a_type != AT_NULL; p++)
     if (p->a_type == type)

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) ""

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) ""

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, unsigned long int word)
 {
   int i;
 
+  /* Handle in a more sophisticated manner if HWCAP2 is supported.  */
+  if (type == AT_HWCAP2)
+    return 0;
+
   _dl_printf ("AT_HWCAP:   ");
 
   for (i = 0; i < _DL_HWCAP_COUNT; ++i)

sysdeps/generic/dl-hwcap2.h

@@ -0,0 +1,25 @@
+/* HWCAP2 Availability Test
+   Copyright (C) 1998-2013 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/>.  */
+
+#ifndef _HWCAP2_H
+#define _HWCAP2_H	1
+
+/* Default to unavailable.  */
+#define HWCAP2_AVAIL		(0)
+
+#endif	/* dl-hwcap2.h */

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) ""

sysdeps/generic/ldsodefs.h

@@ -408,6 +408,7 @@ struct rtld_global
     size_t count;
     void *list[50];
   } *_dl_scope_free_list;
+
 #ifdef SHARED
 };
 # define __rtld_global_attribute__
@@ -554,6 +555,14 @@ struct rtld_global_ro
   EXTERN struct link_map *_dl_sysinfo_map;
 #endif
 
+#include <dl-hwcap2.h>
+
+#if HWCAP2_AVAIL
+  /* Mask for more hardware capabilities that are available on some
+     platforms.  */
+  EXTERN uint64_t _dl_hwcap2;
+#endif
+
 #ifdef SHARED
   /* We add a function table to _rtld_global which is then used to
      call the function instead of going through the PLT.  The result

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))

sysdeps/powerpc/dl-procinfo.h

@@ -159,8 +159,12 @@ _dl_string_platform (const char *str)
 #ifdef IS_IN_rtld
 static inline int
 __attribute__ ((unused))
-_dl_procinfo (int word)
+_dl_procinfo (unsigned int type, unsigned long int word)
 {
+  /* Handle in a more sophisticated manner if HWCAP2 is supported.  */
+  if (type == AT_HWCAP2)
+    return 0;
+
   _dl_printf ("AT_HWCAP:       ");
 
   for (int i = _DL_HWCAP_FIRST; i < _DL_HWCAP_COUNT; ++i)

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))

sysdeps/sparc/dl-procinfo.h

@@ -27,10 +27,14 @@
 
 static inline int
 __attribute__ ((unused))
-_dl_procinfo (int word)
+_dl_procinfo (unsigned int type, unsigned long int word)
 {
   int i;
 
+  /* Handle in a more sophisticated manner if HWCAP2 is supported.  */
+  if (type == AT_HWCAP2)
+    return 0;
+
   _dl_printf ("AT_HWCAP:   ");
 
   for (i = 0; i < _DL_HWCAP_COUNT; ++i)

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, unsigned long int word)
 {
   /* This table should match the information from arch/i386/kernel/setup.c
      in the kernel sources.  */
   int i;
 
+  /* Handle in a more sophisticated manner if HWCAP2 is supported.  */
+  if (type == AT_HWCAP2)
+    return 0;
+
   _dl_printf ("AT_HWCAP:   ");
 
   for (i = 0; i < _DL_HWCAP_COUNT; ++i)

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, unsigned long int word)
 {
   /* This table should match the information from arch/s390/kernel/setup.c
      in the kernel sources.  */
   int i;
 
+  /* Handle in a more sophisticated manner if HWCAP2 is supported.  */
+  if (type == AT_HWCAP2)
+    return 0;
+
   _dl_printf ("AT_HWCAP:   ");
 
   for (i = 0; i < _DL_HWCAP_COUNT; ++i)