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/* Machine-dependent pthreads configuration and inline functions.
x86-64 version.
Copyright (C) 2001, 2002, 2003, 2004 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 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/>. */
#ifndef _PT_MACHINE_H
#define _PT_MACHINE_H 1
#include <features.h>
#ifndef __ASSEMBLER__
# include <stddef.h> /* For offsetof. */
# include <stdlib.h> /* For abort(). */
# include <asm/prctl.h>
# ifndef PT_EI
# define PT_EI __extern_always_inline
# endif
extern long int testandset (int *);
extern int __compare_and_swap (long int *, long int, long int);
/* 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__ ("%rsp") __attribute_used__;
/* Spinlock implementation; required. */
PT_EI long int
testandset (int *__spinlock)
{
long int ret;
__asm__ __volatile__ (
"xchgl %k0, %1"
: "=r"(ret), "=m"(*__spinlock)
: "0"(1), "m"(*__spinlock)
: "memory");
return ret;
}
/* 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)
{
char ret;
long int readval;
__asm__ __volatile__ ("lock; cmpxchgq %3, %1; sete %0"
: "=q" (ret), "=m" (*__p), "=a" (readval)
: "r" (__newval), "m" (*__p), "a" (__oldval)
: "memory");
return ret;
}
#endif /* !__ASSEMBLER__ */
/* We want the OS to assign stack addresses. */
#define FLOATING_STACKS 1
/* Maximum size of the stack if the rlimit is unlimited. */
#define ARCH_STACK_MAX_SIZE 32*1024*1024
/* The ia32e really want some help to prevent overheating. */
#define BUSY_WAIT_NOP __asm__ ("rep; nop")
#endif /* pt-machine.h */
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