mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-29 08:11:08 +00:00
93 lines
2.5 KiB
C
93 lines
2.5 KiB
C
|
/* Machine-dependent pthreads configuration and inline functions.
|
||
|
|
|
||
|
|
Copyright (C) 1996, 1997, 1998, 2000, 2002, 2003, 2004
|
||
|
|
Free Software Foundation, Inc.
|
||
|
|
This file is part of the GNU C Library.
|
||
|
|
Contributed by Ralf Baechle <ralf@gnu.org>.
|
||
|
|
Based on the Alpha version by Richard Henderson <rth@tamu.edu>.
|
||
|
|
|
||
|
|
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; see the file COPYING.LIB. If
|
||
|
|
not, write to the Free Software Foundation, Inc.,
|
||
|
|
59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
|
||
|
|
|
||
|
|
#ifndef _PT_MACHINE_H
|
||
|
|
#define _PT_MACHINE_H 1
|
||
|
|
|
||
|
|
#include <sgidefs.h>
|
||
|
|
#include <sys/tas.h>
|
||
|
|
|
||
|
|
#ifndef PT_EI
|
||
|
|
# define PT_EI extern inline __attribute__ ((always_inline))
|
||
|
|
#endif
|
||
|
|
|
||
|
|
extern long int testandset (int *spinlock);
|
||
|
|
extern int __compare_and_swap (long int *p, long int oldval, long int newval);
|
||
|
|
|
||
|
|
|
||
|
|
/* Spinlock implementation; required. */
|
||
|
|
|
||
|
|
PT_EI long int
|
||
|
|
testandset (int *spinlock)
|
||
|
|
{
|
||
|
|
return _test_and_set (spinlock, 1);
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
/* Get some notion of the current stack. Need not be exactly the top
|
||
|
|
of the stack, just something somewhere in the current frame. */
|
||
|
|
#define CURRENT_STACK_FRAME stack_pointer
|
||
|
|
register char * stack_pointer __asm__ ("$29");
|
||
|
|
|
||
|
|
|
||
|
|
/* Compare-and-swap for semaphores. */
|
||
|
|
|
||
|
|
#define HAS_COMPARE_AND_SWAP
|
||
|
|
PT_EI int
|
||
|
|
__compare_and_swap (long int *p, long int oldval, long int newval)
|
||
|
|
{
|
||
|
|
long int ret, temp;
|
||
|
|
|
||
|
|
__asm__ __volatile__
|
||
|
|
("/* Inline compare & swap */\n"
|
||
|
|
"1:\n\t"
|
||
|
|
".set push\n\t"
|
||
|
|
#if _MIPS_SIM == _ABIO32
|
||
|
|
".set mips2\n\t"
|
||
|
|
#endif
|
||
|
|
#if _MIPS_SIM == _ABI64
|
||
|
|
"lld %1,%5\n\t"
|
||
|
|
#else
|
||
|
|
"ll %1,%5\n\t"
|
||
|
|
#endif
|
||
|
|
"move %0,$0\n\t"
|
||
|
|
"bne %1,%3,2f\n\t"
|
||
|
|
"move %0,%4\n\t"
|
||
|
|
#if _MIPS_SIM == _ABI64
|
||
|
|
"scd %0,%2\n\t"
|
||
|
|
#else
|
||
|
|
"sc %0,%2\n\t"
|
||
|
|
#endif
|
||
|
|
".set pop\n\t"
|
||
|
|
"beqz %0,1b\n"
|
||
|
|
"2:\n\t"
|
||
|
|
"/* End compare & swap */"
|
||
|
|
: "=&r" (ret), "=&r" (temp), "=m" (*p)
|
||
|
|
: "r" (oldval), "r" (newval), "m" (*p)
|
||
|
|
: "memory");
|
||
|
|
|
||
|
|
return ret;
|
||
|
|
}
|
||
|
|
|
||
|
|
#endif /* pt-machine.h */
|