Fix SHMLBA on sparc.

[BZ #6471]
	* sysdeps/unix/sysv/linux/shmat.c (shmat): Test for syscall errors
	properly.
	* sysdeps/unix/sysv/linux/sparc/getshmlba.c: New file.
	* sysdeps/unix/sysv/linux/sparc/Makefile: Add getshmlba to
	sysdep_routines when subdir is sysvipc.
	* sysdeps/unix/sysv/linux/sparc/bits/shm.h (SHMLBA): Use new
	__getshmlba helper.

ChangeLog

@@ -1,5 +1,14 @@
 2012-03-16  David S. Miller  <davem@davemloft.net>
 
+	[BZ #6471]
+	* sysdeps/unix/sysv/linux/shmat.c (shmat): Test for syscall errors
+	properly.
+	* sysdeps/unix/sysv/linux/sparc/getshmlba.c: New file.
+	* sysdeps/unix/sysv/linux/sparc/Makefile: Add getshmlba to
+	sysdep_routines when subdir is sysvipc.
+	* sysdeps/unix/sysv/linux/sparc/bits/shm.h (SHMLBA): Use new
+	__getshmlba helper.
+
 	* sysdeps/sparc/fpu/libm-test/ulps: Update.
 
 2012-03-16  H.J. Lu  <hongjiu.lu@intel.com>

NEWS

@@ -11,12 +11,12 @@ Version 2.16
 
   174, 350, 411, 2541, 2547, 2548, 2551, 2552, 2553, 2554, 2562, 2563, 2565,
   2566, 2576, 3335, 3976, 3992, 4026, 4108, 4596, 4822, 5077, 5461, 5805,
-  5993, 6884, 6907, 6911, 9739, 9902, 10110, 10135, 10140, 10210, 10545,
+  5993, 6471, 6884, 6907, 6911, 9739, 9902, 10110, 10135, 10140, 10210,
-  10716, 11174, 11322, 11365, 11494, 12047, 13058, 13525, 13526, 13527,
+  10545, 10716, 11174, 11322, 11365, 11494, 12047, 13058, 13525, 13526,
-  13528, 13529, 13530, 13531, 13532, 13533, 13547, 13551, 13552, 13553,
+  13527, 13528, 13529, 13530, 13531, 13532, 13533, 13547, 13551, 13552,
-  13555, 13559, 13566, 13583, 13618, 13637, 13656, 13658, 13673, 13695,
+  13553, 13555, 13559, 13566, 13583, 13618, 13637, 13656, 13658, 13673,
-  13704, 13706, 13726, 13738, 13786, 13792, 13806, 13840, 13841, 13844,
+  13695, 13704, 13706, 13726, 13738, 13786, 13792, 13806, 13840, 13841,
-  13846, 13851, 13852, 13854
+  13844, 13846, 13851, 13852, 13854
 
 * ISO C11 support:
 

sysdeps/unix/sysv/linux/shmat.c

@@ -35,7 +35,8 @@ shmat (shmid, shmaddr, shmflg)
      const void *shmaddr;
      int shmflg;
 {
-  void *__unbounded result;
+  INTERNAL_SYSCALL_DECL(err);
+  unsigned long resultvar;
   void *__unbounded raddr;
 
 #if __BOUNDED_POINTERS__
@@ -47,12 +48,15 @@ shmat (shmid, shmaddr, shmflg)
     length = shmds.shm_segsz;
 #endif
 
-  result = (void *__unbounded) INLINE_SYSCALL (ipc, 5, IPCOP_shmat,
+  resultvar = INTERNAL_SYSCALL (ipc, err, 5, IPCOP_shmat,
-					       shmid, shmflg,
+				shmid, shmflg,
-					       (long int) __ptrvalue (&raddr),
+				(long int) __ptrvalue (&raddr),
-					       __ptrvalue ((void *) shmaddr));
+				__ptrvalue ((void *) shmaddr));
-  if ((unsigned long) result <= -(unsigned long) SHMLBA)
+  if (INTERNAL_SYSCALL_ERROR_P (resultvar, err))
-    result = raddr;
+    {
+      __set_errno (INTERNAL_SYSCALL_ERRNO (resultvar, err));
+      return (void *) -1;
+    }
 
-  return BOUNDED_N (result, length);
+  return BOUNDED_N (raddr, length);
 }

sysdeps/unix/sysv/linux/sparc/Makefile

@@ -7,3 +7,7 @@ syscall-list-64bit-condition := __WORDSIZE == 64
 ifeq ($(subdir),rt)
 librt-routines += rt-sysdep
 endif
+
+ifeq ($(subdir),sysvipc)
+sysdep_routines += getshmlba
+endif

sysdeps/unix/sysv/linux/sparc/bits/shm.h

@@ -40,8 +40,8 @@
 __BEGIN_DECLS
 
 /* Segment low boundary address multiple.  */
-#define SHMLBA		(__getpagesize ())
+#define SHMLBA		(__getshmlba ())
-extern int __getpagesize (void) __THROW __attribute__ ((__const__));
+extern int __getshmlba (void) __attribute__ ((__const__));
 
 
 /* Type to count number of attaches.  */

sysdeps/unix/sysv/linux/sparc/getshmlba.c

@@ -0,0 +1,40 @@
+/* Copyright (C) 2012
+   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/>.  */
+
+#include <unistd.h>
+#include <sys/shm.h>
+#include <ldsodefs.h>
+
+int
+__getshmlba (void)
+{
+  uint64_t hwcap = GLRO(dl_hwcap);
+  int pgsz = GLRO(dl_pagesize);
+
+  if (hwcap & HWCAP_SPARC_V9)
+    {
+      if (pgsz < (16 * 1024))
+	return 16 * 1024;
+      else
+	return pgsz;
+    }
+  else if (!(hwcap & HWCAP_SPARC_FLUSH))
+    return 64 * 1024;
+  else
+    return 256 * 1024;
+}