Define a BUSY_WAIT_NOP for sparc.

nptl/

	* sysdeps/unix/sysv/linux/sparc/lowlevellock.h (BUSY_WAIT_NOP):
	Define when we have v9 instructions available.
	* sysdeps/unix/sysv/linux/sparc/sparc64/cpu_relax.S: New file.
	* sysdeps/unix/sysv/linux/sparc/sparc32/sparcv9/cpu_relax.S: New
	file.
	* sysdeps/unix/sysv/linux/sparc/sparc32/sparcv9/Makefile: New
	file.
	* sysdeps/unix/sysv/linux/sparc/sparc64/Makefile: Add cpu_relax
	to libpthread-routines.

6 files changed, 88 insertions, 0 deletions

diff --git a/nptl/ChangeLog b/nptl/ChangeLog
index 40ddc25..803df62 100644
--- a/nptl/ChangeLog
+++ b/nptl/ChangeLog
@@ -1,3 +1,15 @@
+2012-10-28  David S. Miller  <davem@davemloft.net>
+
+	* sysdeps/unix/sysv/linux/sparc/lowlevellock.h (BUSY_WAIT_NOP):
+	Define when we have v9 instructions available.
+	* sysdeps/unix/sysv/linux/sparc/sparc64/cpu_relax.S: New file.
+	* sysdeps/unix/sysv/linux/sparc/sparc32/sparcv9/cpu_relax.S: New
+	file.
+	* sysdeps/unix/sysv/linux/sparc/sparc32/sparcv9/Makefile: New
+	file.
+	* sysdeps/unix/sysv/linux/sparc/sparc64/Makefile: Add cpu_relax
+	to libpthread-routines.
+
 2012-10-25  Roland McGrath  <roland@hack.frob.com>
 
 	* tst-cond-except.c (TEST_FUNCTION): New macro.
diff --git a/nptl/sysdeps/unix/sysv/linux/sparc/lowlevellock.h b/nptl/sysdeps/unix/sysv/linux/sparc/lowlevellock.h
index fafb087..e049562 100644
--- a/nptl/sysdeps/unix/sysv/linux/sparc/lowlevellock.h
+++ b/nptl/sysdeps/unix/sysv/linux/sparc/lowlevellock.h
@@ -50,6 +50,11 @@
 #define LLL_PRIVATE	0
 #define LLL_SHARED	FUTEX_PRIVATE_FLAG
 
+#ifndef __sparc32_atomic_do_lock
+/* Delay in spinlock loop.  */
+extern void __cpu_relax(void);
+#define BUSY_WAIT_NOP	__cpu_relax()
+#endif
 
 #if !defined NOT_IN_libc || defined IS_IN_rtld
 /* In libc.so or ld.so all futexes are private.  */
diff --git a/nptl/sysdeps/unix/sysv/linux/sparc/sparc32/sparcv9/Makefile b/nptl/sysdeps/unix/sysv/linux/sparc/sparc32/sparcv9/Makefile
new file mode 100644
index 0000000..f7acc01
--- /dev/null
+++ b/nptl/sysdeps/unix/sysv/linux/sparc/sparc32/sparcv9/Makefile
@@ -0,0 +1 @@
+libpthread-routines += cpu_relax
diff --git a/nptl/sysdeps/unix/sysv/linux/sparc/sparc32/sparcv9/cpu_relax.S b/nptl/sysdeps/unix/sysv/linux/sparc/sparc32/sparcv9/cpu_relax.S
new file mode 100644
index 0000000..4ac4d14
--- /dev/null
+++ b/nptl/sysdeps/unix/sysv/linux/sparc/sparc32/sparcv9/cpu_relax.S
@@ -0,0 +1 @@
+#include <sparc64/cpu_relax.S>
diff --git a/nptl/sysdeps/unix/sysv/linux/sparc/sparc64/Makefile b/nptl/sysdeps/unix/sysv/linux/sparc/sparc64/Makefile
index 774b267..656d2e0 100644
--- a/nptl/sysdeps/unix/sysv/linux/sparc/sparc64/Makefile
+++ b/nptl/sysdeps/unix/sysv/linux/sparc/sparc64/Makefile
@@ -1,3 +1,5 @@
+libpthread-routines += cpu_relax
+
 ifeq ($(subdir),nptl)
 CFLAGS-pause.c += -fexceptions
 CFLAGS-sigsuspend.c += -fexceptions
diff --git a/nptl/sysdeps/unix/sysv/linux/sparc/sparc64/cpu_relax.S b/nptl/sysdeps/unix/sysv/linux/sparc/sparc64/cpu_relax.S
new file mode 100644
index 0000000..9e64c50
--- /dev/null
+++ b/nptl/sysdeps/unix/sysv/linux/sparc/sparc64/cpu_relax.S
@@ -0,0 +1,67 @@
+/* CPU strand yielding for busy loops.
+   Copyright (C) 2012 Free Software Foundation, Inc.
+   Contributed by David S. Miller (davem@davemloft.net)
+   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 <sysdep.h>
+
+	.text
+__cpu_relax_generic:
+	rd	%ccr, %g0
+	rd	%ccr, %g0
+	rd	%ccr, %g0
+	retl
+	 nop
+	.size	__cpu_relax_generic,.-__cpu_relax_generic
+
+__cpu_relax_pause:
+	wr	%g0, 128, %asr27
+	retl
+	 nop
+	.size	__cpu_relax_pause,.-__cpu_relax_pause
+
+ENTRY(__cpu_relax)
+	.type	__cpu_relax, @gnu_indirect_function
+# ifdef SHARED
+	SETUP_PIC_REG_LEAF(o3, o5)
+# endif
+	set	HWCAP_SPARC_PAUSE, %o1
+	andcc	%o0, %o1, %g0
+	be	1f
+	 nop
+# ifdef SHARED
+	sethi	%gdop_hix22(__cpu_relax_pause), %o1
+	xor	%o1, %gdop_lox10(__cpu_relax_pause), %o1
+# else
+	set	__cpu_relax_pause, %o1
+# endif
+	ba	10f
+	 nop
+1:
+# ifdef SHARED
+	sethi	%gdop_hix22(__cpu_relax_generic), %o1
+	xor	%o1, %gdop_lox10(__cpu_relax_generic), %o1
+# else
+	set	__cpu_relax_generic, %o1
+# endif
+10:
+# ifdef SHARED
+	add	%o3, %o1, %o1
+# endif
+	retl
+	 mov	%o1, %o0
+END(__cpu_relax)