mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-23 13:30:06 +00:00
68 lines
1.7 KiB
ArmAsm
68 lines
1.7 KiB
ArmAsm
/* CPU strand yielding for busy loops.
|
|
Copyright (C) 2012-2015 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)
|