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glibc/ports/sysdeps/am33/linuxthreads/pt-machine.h
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/* Machine-dependent pthreads configuration and inline functions. | |
am33 version. | |
Copyright (C) 1996,1997,1998,1999,2000,2001, 2004 | |
Free Software Foundation, Inc. | |
This file is part of the GNU C Library. | |
Contributed by Alexandre Oliva <aoliva@redhat.com> | |
Based on ../i386/pt-machine.h. | |
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. If not, see | |
<http://www.gnu.org/licenses/>. */ | |
#ifndef _PT_MACHINE_H | |
#define _PT_MACHINE_H 1 | |
#ifndef __ASSEMBLER__ | |
#ifndef PT_EI | |
# define PT_EI extern inline | |
#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 __builtin_frame_address (0) | |
/* Spinlock implementation; required. */ | |
PT_EI long int | |
testandset (int *spinlock) | |
{ | |
long int ret = 1; | |
/* This won't test&set the entire int, only the least significant | |
byte. I hope this doesn't matter, since we can't do better. */ | |
__asm__ __volatile__ ("bset %0, %1; bne 1f; clr %0; 1:" : | |
"+d" (ret), "+m" (*(volatile int *)spinlock)); | |
return ret; | |
} | |
PT_EI int | |
get_eflags (void) | |
{ | |
int res; | |
__asm__ __volatile__ ("mov psw,%0" : "=d" (res)); | |
return res; | |
} | |
PT_EI void | |
set_eflags (int newflags) | |
{ | |
__asm__ __volatile__ ("mov %0,psw" : : "d" (newflags) : "cc"); | |
} | |
#endif /* __ASSEMBLER__ */ | |
#endif /* pt-machine.h */ |