Update.

1998-03-30  Ulrich Drepper  <drepper@cygnus.com>

	* sysdeps/generic/dl-sysdep.c (_dl_important_hwcaps): New
	function.

	* sysdeps/generic/dl-procinfo.h (HWCAP_IMPORTANT): New definition.

	* sysdeps/unix/sysv/linux/i386/dl-procinfo.h (_dl_hwcap_string):
	New function.
	(HWCAP_IMPORTANT): New definition.

1998-03-30 17:26  H.J. Lu  <hjl@gnu.org>

	* elf/dl-open.c (_dl_open): Fix a typo.
	(_dl_global_scope_alloc): Make it static.

	* nss/getXXent_r.c (REENTRANT_GETNAME): Avoid endless loop.

3 files changed, 54 insertions, 12 deletions

diff --git a/sysdeps/generic/dl-procinfo.h b/sysdeps/generic/dl-procinfo.h
index 801d4b6fa1..48936194ac 100644
--- a/sysdeps/generic/dl-procinfo.h
+++ b/sysdeps/generic/dl-procinfo.h
@@ -24,4 +24,7 @@
 /* We cannot provide a general printing function.  */
 #define _dl_procinfo(word) -1
 
+/* By default there is no important hardware capability.  */
+#define HWCAP_IMPORTANT (0)
+
 #endif /* dl-procinfo.h */
diff --git a/sysdeps/generic/dl-sysdep.c b/sysdeps/generic/dl-sysdep.c
index 8db0c7889f..7f5e32193a 100644
--- a/sysdeps/generic/dl-sysdep.c
+++ b/sysdeps/generic/dl-sysdep.c
@@ -45,6 +45,7 @@ int __libc_enable_secure;
 int __libc_multiple_libcs;	/* Defining this here avoids the inclusion
 				   of init-first.  */
 static ElfW(auxv_t) *_dl_auxv;
+static unsigned long hwcap;
 
 
 #ifndef DL_FIND_ARG_COMPONENTS
@@ -235,10 +236,10 @@ _dl_show_auxv (void)
 	_dl_sysdep_message ("AT_PLATFORM: ", av->a_un.a_ptr, "\n", NULL);
 	break;
       case AT_HWCAP:
-	if (_dl_procinfo (av->a_un.a_val) < 0)
+	hwcap = av->a_un.a_val;
+	if (_dl_procinfo (hwcap) < 0)
 	  _dl_sysdep_message ("AT_HWCAP:    ",
-			      _itoa_word (av->a_un.a_val, buf + sizeof buf - 1,
-					  16, 0),
+			      _itoa_word (hwcap, buf + sizeof buf - 1, 16, 0),
 			      "\n", NULL);
 	break;
       }
@@ -269,3 +270,30 @@ _dl_next_ld_env_entry (char ***position)
 
   return result;
 }
+
+/* Return an array of useful/necessary hardware capability names.  */
+char **
+_dl_important_hwcaps (size_t *sz)
+{
+  /* Determine how many important bits are set.  */
+  unsigned long int important = hwcap & HWCAP_IMPORTANT;
+  size_t cnt = 0;
+  size_t n;
+  char **result;
+
+  for (n = 0; (~((1UL << n) - 1) & important) != 0; ++n)
+    if ((important & (1UL << n)) != 0)
+      ++cnt;
+
+  *sz = 0;
+  if (cnt == 0)
+    return NULL;
+
+  result = (char **) malloc (cnt * sizeof (char *));
+  if (result != NULL)
+    for (n = 0; (~((1UL << n) - 1) & important) != 0; ++n)
+      if ((important & (1UL << n)) != 0)
+	result[*sz++] = _dl_hwcap_string (n);
+
+  return result;
+}
diff --git a/sysdeps/unix/sysv/linux/i386/dl-procinfo.h b/sysdeps/unix/sysv/linux/i386/dl-procinfo.h
index 48d5cd31fa..85baf74496 100644
--- a/sysdeps/unix/sysv/linux/i386/dl-procinfo.h
+++ b/sysdeps/unix/sysv/linux/i386/dl-procinfo.h
@@ -21,19 +21,20 @@
 #ifndef _DL_PROCINFO_H
 #define _DL_PROCINFO_H	1
 
+static const char *x86_cap_flags[] =
+  {
+    "fpu", "vme", "de", "pse", "tsc", "msr", "pae", "mce",
+    "cx8", "apic", "10", "sep", "mtrr", "pge", "mca", "cmov",
+    "fcmov", "17", "18", "19", "20", "21", "22", "mmx",
+    "osfxsr", "25", "26", "27", "28", "29", "30", "amd3d"
+  };
+
 static inline int
 __attribute__ ((unused))
 _dl_procinfo (int word)
 {
   /* This table should match the information from arch/i386/kernel/setup.c
      in the kernel sources.  */
-  static const char *x86_cap_flags[] =
-  {
-    "fpu", "vme", "de", "pse", "tsc", "msr", "pae", "mce",
-    "cx8", "apic", "10", "sep", "mtrr", "pge", "mca", "cmov",
-    "fcmov", "17", "18", "19", "20", "21", "22", "mmx",
-    "cxmmx", "25", "26", "27", "28", "29", "30", "amd3d"
-  };
   int i;
 
   _dl_sysdep_message ("AT_HWCAP:   ", NULL);
@@ -47,6 +48,13 @@ _dl_procinfo (int word)
   return 0;
 }
 
+static inline const char *
+__attribute__ ((unused))
+_dl_hwcap_string (int idx)
+{
+  return x86_cap_flags[idx];
+};
+
 enum
 {
   HWCAP_I386_FPU   = 1 << 0,
@@ -66,8 +74,11 @@ enum
   HWCAP_I386_CMOV  = 1 << 15,
   HWCAP_I386_FCMOV = 1 << 16,
   HWCAP_I386_MMX   = 1 << 23,
-  HWCAP_I386_CXMMX = 1 << 24,
-  HWCAP_I386_AMD3D = 1 << 31
+  HWCAP_I386_OSFXSR = 1 << 24,
+  HWCAP_I386_AMD3D = 1 << 31,
+
+  /* XXX Which others to add here?  */
+  HWCAP_IMPORTANT = (HWCAP_I386_MMX)
 };
 
 #endif /* dl-procinfo.h */