Add support for AT_HWCAP2.

ChangeLog

@@ -1,3 +1,23 @@
+2013-06-13  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.
+	* elf/elf.h (AT_HWCAP2): Add a new a_type entry.
+	* sysdeps/powerpc/dl-procinfo.c (_dl_powerpc_cap_flags): Extend for
+	for an additional 32 AT_HWCAP2 flags.
+	* sysdeps/powerpc/dl-procinfo.h (_dl_procinfo): Add support for
+	displaying AT_HWCAP2 strings.  Add TYPE parameter.  Make WORD unsigned
+	rather than signed.
+	* sysdeps/generic/dl-procinfo.h (_dl_procinfo): Add TYPE parameter to
+	macro prototype for AT_HWCAP2 support.
+	* sysdeps/i386/dl-procinfo.h: Likewise.
+	* sysdeps/s390/dl-procinfo.h: Likewise.
+	* sysdeps/sparc/dl-procinfo.h (_dl_procinfo): Add TYPE parameter for
+	future AT_HWCAP2 support.  Make WORD unsigned rather than signed.
+	* sysdeps/unix/sysv/linux/i386/dl-procinfo.h: Likewise.
+	* sysdeps/unix/sysv/linux/s390/dl-procinfo.h: Likewise.
+
 2013-06-13  Siddhesh Poyarekar  <siddhesh@redhat.com>
 
 	* NEWS: Fix note on clock function precision.  Text by Roland

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;

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 +324,11 @@ _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;
 	}
 

elf/elf.h

@@ -993,7 +993,7 @@ typedef struct
 
 /* Some more special a_type values describing the hardware.  */
 #define AT_PLATFORM	15		/* String identifying platform.  */
-#define AT_HWCAP	16		/* Machine dependent hints about
+#define AT_HWCAP	16		/* Machine-dependent hints about
 					   processor capabilities.  */
 
 /* This entry gives some information about the FPU initialization
@@ -1015,6 +1015,9 @@ typedef struct
 
 #define AT_RANDOM	25		/* Address of 16 random bytes.  */
 
+#define AT_HWCAP2	26		/* More 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

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)

ports/ChangeLog.alpha

@@ -1,3 +1,8 @@
+2013-06-13  Ryan S. Arnold  <rsa@linux.vnet.ibm.com>
+
+	* sysdeps/alpha/dl-procinfo.h (_dl_procinfo): Add TYPE parameter for
+	AT_HWCAP2 support.
+
 2013-06-05  Joseph Myers  <joseph@codesourcery.com>
 
 	* sysdeps/alpha/bits/atomic.h: Remove trailing whitespace.

ports/ChangeLog.arm

@@ -1,3 +1,8 @@
+2013-06-13  Ryan S. Arnold  <rsa@linux.vnet.ibm.com>
+
+	* sysdeps/unix/sysv/linux/arm/dl-procinfo.h (_dl_procinfo): Add
+	TYPE parameter for AT_HWCAP2 support.  Make WORD unsigned.
+
 2013-06-11  Joseph Myers  <joseph@codesourcery.com>
 
 	* sysdeps/arm/math-tests.h [__SOFTFP__] (EXCEPTION_TESTS_float):

ports/ChangeLog.mips

@@ -1,3 +1,8 @@
+2013-06-13  Ryan S. Arnold  <rsa@linux.vnet.ibm.com>
+
+	* sysdeps/mips/dl-procinfo.h (_dl_procinfo): Add TYPE parameter for
+	AT_HWCAP2 support.
+
 2013-06-05  Joseph Myers  <joseph@codesourcery.com>
 
 	* sysdeps/mips/fpu/fgetexcptflg.c: Remove trailing whitespace.

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 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)

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/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.c

@@ -45,7 +45,7 @@
 #if !defined PROCINFO_DECL && defined SHARED
   ._dl_powerpc_cap_flags
 #else
-PROCINFO_CLASS const char _dl_powerpc_cap_flags[25][10]
+PROCINFO_CLASS const char _dl_powerpc_cap_flags[57][10]
 #endif
 #ifndef PROCINFO_DECL
 = {
@@ -56,6 +56,14 @@ PROCINFO_CLASS const char _dl_powerpc_cap_flags[25][10]
     "notb", "efpdouble", "efpsingle", "spe",
     "ucache", "4xxmac", "mmu", "fpu",
     "altivec", "ppc601", "ppc64", "ppc32",
+    "", "", "", "",
+    "", "", "", "",
+    "", "", "", "",
+    "", "", "", "",
+    "", "", "", "",
+    "", "", "", "",
+    "", "", "", "",
+    "", "", "", "",
   }
 #endif
 #if !defined SHARED || defined PROCINFO_DECL

sysdeps/powerpc/dl-procinfo.h

@@ -20,11 +20,21 @@
 #define _DL_PROCINFO_H 1
 
 #include <ldsodefs.h>
-#include <sysdep.h>	/* This defines the PPC_FEATURE_* macros.  */
+#include <sysdep.h>	/* This defines the PPC_FEATURE[2]_* 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.  The feature
+ * definitions started at bit 31 and decremented as new features were added.
+ */
+#define _DL_HWCAP_LAST		31
 #define _DL_HWCAP_FIRST		7
-#define _DL_HWCAP_COUNT		32
+
+/* AT_HWCAP2 feature bits similarily started at bit 31 and decremented as new
+   features were added.  HWCAP2 feature bits start at bit 0.  */
+#define _DL_HWCAP2_LAST		31
+
+/* The total number of available bits (including those prior to
+   _DL_HWCAP_FIRST).  Some of these bits might not be used.  */
+#define _DL_HWCAP_COUNT		64
 
 /* These bits influence library search.  */
 #define HWCAP_IMPORTANT		(PPC_FEATURE_HAS_ALTIVEC \
@@ -153,15 +163,37 @@ _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 int word)
 {
-  _dl_printf ("AT_HWCAP:       ");
+  switch(type)
+    {
+    case AT_HWCAP:
+      _dl_printf ("AT_HWCAP:       ");
 
-  for (int i = _DL_HWCAP_FIRST; i < _DL_HWCAP_COUNT; ++i)
-    if (word & (1 << i))
-      _dl_printf (" %s", _dl_hwcap_string (i));
+      for (int i = _DL_HWCAP_FIRST; i <= _DL_HWCAP_LAST; ++i)
+	if (word & (1 << i))
+	  _dl_printf (" %s", _dl_hwcap_string (i));
+      break;
+    case AT_HWCAP2:
+      {
+	unsigned int offset = _DL_HWCAP_LAST + 1;
+
+	_dl_printf ("AT_HWCAP2:      ");
+
+        /* We have to go through them all because the kernel added the
+	   AT_HWCAP2 features starting with the high bits.  */
+	for (int i = 0; i <= _DL_HWCAP2_LAST; ++i)
+	  if (word & (1 << i))
+	    _dl_printf (" %s", _dl_hwcap_string (offset + i));
+	break;
+      }
+    default:
+      /* This should not happen.  */
+      return -1;
+    }
 
   _dl_printf ("\n");
 

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 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)

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 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)

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 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)