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/* Machine-dependent pthreads configuration and inline functions.
Copyright (C) 1996, 1997, 1998, 2000 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 Library General Public License as
published by the Free Software Foundation; either version 2 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
Library General Public License for more details.
You should have received a copy of the GNU Library 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. */
#include <sgidefs.h>
#include <sys/tas.h>
#ifndef PT_EI
# define PT_EI extern inline
#endif
/* Memory barrier. */
#define MEMORY_BARRIER() __asm__ ("" : : : "memory")
/* Spinlock implementation; required. */
#if (_MIPS_ISA >= _MIPS_ISA_MIPS2)
PT_EI long int
testandset (int *spinlock)
{
long int ret, temp;
__asm__ __volatile__
("/* Inline spinlock test & set */\n\t"
"1:\n\t"
"ll %0,%3\n\t"
".set push\n\t"
".set noreorder\n\t"
"bnez %0,2f\n\t"
" li %1,1\n\t"
".set pop\n\t"
"sc %1,%2\n\t"
"beqz %1,1b\n"
"2:\n\t"
"/* End spinlock test & set */"
: "=&r" (ret), "=&r" (temp), "=m" (*spinlock)
: "m" (*spinlock)
: "memory");
return ret;
}
#else /* !(_MIPS_ISA >= _MIPS_ISA_MIPS2) */
PT_EI long int
testandset (int *spinlock)
{
return _test_and_set (spinlock, 1);
}
#endif /* !(_MIPS_ISA >= _MIPS_ISA_MIPS2) */
/* 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. */
#if (_MIPS_ISA >= _MIPS_ISA_MIPS2)
#define HAS_COMPARE_AND_SWAP
PT_EI int
__compare_and_swap (long int *p, long int oldval, long int newval)
{
long int ret;
__asm__ __volatile__
("/* Inline compare & swap */\n\t"
"1:\n\t"
"ll %0,%4\n\t"
".set push\n"
".set noreorder\n\t"
"bne %0,%2,2f\n\t"
" move %0,%3\n\t"
".set pop\n\t"
"sc %0,%1\n\t"
"beqz %0,1b\n"
"2:\n\t"
"/* End compare & swap */"
: "=&r" (ret), "=m" (*p)
: "r" (oldval), "r" (newval), "m" (*p)
: "memory");
return ret;
}
#endif /* (_MIPS_ISA >= _MIPS_ISA_MIPS2) */
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