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/* Machine-dependent pthreads configuration and inline functions.
x86-64 version.
Copyright (C) 2001, 2002 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, 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 <stddef.h> /* For offsetof. */
#include <stdlib.h> /* For abort(). */
#include <asm/prctl.h>
#ifndef PT_EI
# define PT_EI extern inline
#endif
extern long int testandset (int *spinlock);
extern int __compare_and_swap (long int *p, long int oldval, long int newval);
/* 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");
/* Spinlock implementation; required. */
PT_EI long int
testandset (int *spinlock)
{
long int ret;
__asm__ __volatile__ (
"xchgq %0, %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;
}
/* Return the thread descriptor for the current thread.
The contained asm must *not* be marked volatile since otherwise
assignments like
pthread_descr self = thread_self();
do not get optimized away. */
#define THREAD_SELF \
({ \
register pthread_descr __self; \
__asm__ ("movq %%gs:%c1,%0" : "=r" (__self) \
: "i" (offsetof (struct _pthread_descr_struct, \
p_header.data.self))); \
__self; \
})
/* Prototype for the system call. */
extern int __arch_prctl (int __code, unsigned long __addr);
/* Initialize the thread-unique value. */
#define INIT_THREAD_SELF(descr, nr) \
{ \
if (__arch_prctl (ARCH_SET_GS, (unsigned long)descr) != 0) \
abort (); \
}
/* Read member of the thread descriptor directly. */
#define THREAD_GETMEM(descr, member) \
({ \
__typeof__ (descr->member) __value; \
if (sizeof (__value) == 1) \
__asm__ __volatile__ ("movb %%gs:%P2,%b0" \
: "=q" (__value) \
: "0" (0), \
"i" (offsetof (struct _pthread_descr_struct, \
member))); \
else if (sizeof (__value) == 4) \
__asm__ __volatile__ ("movl %%gs:%P1,%0" \
: "=r" (__value) \
: "i" (offsetof (struct _pthread_descr_struct, \
member))); \
else \
{ \
if (sizeof (__value) != 8) \
/* There should not be any value with a size other than 1, 4 or 8. */\
abort (); \
\
__asm__ __volatile__ ("movq %%gs:%P1,%0" \
: "=r" (__value) \
: "i" (offsetof (struct _pthread_descr_struct, \
member))); \
} \
__value; \
})
/* Same as THREAD_GETMEM, but the member offset can be non-constant. */
#define THREAD_GETMEM_NC(descr, member) \
({ \
__typeof__ (descr->member) __value; \
if (sizeof (__value) == 1) \
__asm__ __volatile__ ("movb %%gs:(%2),%b0" \
: "=q" (__value) \
: "0" (0), \
"r" (offsetof (struct _pthread_descr_struct, \
member))); \
else if (sizeof (__value) == 4) \
__asm__ __volatile__ ("movl %%gs:(%1),%0" \
: "=r" (__value) \
: "r" (offsetof (struct _pthread_descr_struct, \
member))); \
else \
{ \
if (sizeof (__value) != 8) \
/* There should not be any value with a size other than 1, 4 or 8. */\
abort (); \
\
__asm__ __volatile__ ("movq %%gs:(%1),%0" \
: "=r" (__value) \
: "r" (offsetof (struct _pthread_descr_struct, \
member))); \
} \
__value; \
})
/* Set member of the thread descriptor directly. */
#define THREAD_SETMEM(descr, member, value) \
({ \
__typeof__ (descr->member) __value = (value); \
if (sizeof (__value) == 1) \
__asm__ __volatile__ ("movb %0,%%gs:%P1" : \
: "q" (__value), \
"i" (offsetof (struct _pthread_descr_struct, \
member))); \
else if (sizeof (__value) == 4) \
__asm__ __volatile__ ("movl %0,%%gs:%P1" : \
: "r" (__value), \
"i" (offsetof (struct _pthread_descr_struct, \
member))); \
else \
{ \
if (sizeof (__value) != 8) \
/* There should not be any value with a size other than 1, 4 or 8. */\
abort (); \
\
__asm__ __volatile__ ("movq %0,%%gs:%P1" : \
: "r" (__value), \
"i" (offsetof (struct _pthread_descr_struct, \
member))); \
} \
})
/* Same as THREAD_SETMEM, but the member offset can be non-constant. */
#define THREAD_SETMEM_NC(descr, member, value) \
({ \
__typeof__ (descr->member) __value = (value); \
if (sizeof (__value) == 1) \
__asm__ __volatile__ ("movb %0,%%gs:(%1)" : \
: "q" (__value), \
"r" (offsetof (struct _pthread_descr_struct, \
member))); \
else if (sizeof (__value) == 4) \
__asm__ __volatile__ ("movl %0,%%gs:(%1)" : \
: "r" (__value), \
"r" (offsetof (struct _pthread_descr_struct, \
member))); \
else \
{ \
if (sizeof (__value) != 8) \
/* There should not be any value with a size other than 1, 4 or 8. */\
abort (); \
\
__asm__ __volatile__ ("movq %0,%%gs:(%1)" : \
: "r" (__value), \
"r" (offsetof (struct _pthread_descr_struct, \
member))); \
} \
})
/* 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
#endif /* pt-machine.h */
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