+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.
--- /dev/null
+/* 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)