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glibc/linuxthreads/sysdeps/powerpc/pt-machine.h
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/* Machine-dependent pthreads configuration and inline functions. | |
powerpc version. | |
Copyright (C) 1996, 1997, 1998 Free Software Foundation, Inc. | |
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 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. */ | |
/* These routines are from Appendix G of the 'PowerPC 601 RISC Microprocessor | |
User's Manual', by IBM and Motorola. */ | |
/* For multiprocessor systems, we want to ensure all memory accesses | |
are completed before we reset a lock. */ | |
#if 0 | |
/* on non multiprocessor systems, you can just: */ | |
#define sync() /* nothing */ | |
#else | |
#define sync() __asm__ __volatile__ ("sync") | |
#endif | |
/* 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__ ("r1"); | |
/* Compare-and-swap for semaphores. */ | |
/* note that test-and-set(x) is the same as compare-and-swap(x, 0, 1) */ | |
#define HAS_COMPARE_AND_SWAP | |
#if BROKEN_PPC_ASM_CR0 | |
static | |
#else | |
extern inline | |
#endif | |
int | |
__compare_and_swap (long *p, long oldval, long newval) | |
{ | |
int ret; | |
sync(); | |
__asm__ __volatile__( | |
"0: lwarx %0,0,%1 ;" | |
" xor. %0,%3,%0;" | |
" bne 1f;" | |
" stwcx. %2,0,%1;" | |
" bne- 0b;" | |
"1: " | |
: "=&r"(ret) | |
: "r"(p), "r"(newval), "r"(oldval) | |
: "cr0", "memory"); | |
sync(); | |
return ret == 0; | |
} |