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/* Machine-dependent pthreads configuration and inline functions.
Sparc v9 version.
Copyright (C) 1997-2002, 2003 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed 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 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; see the file COPYING.LIB. 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
#ifndef PT_EI
# define PT_EI extern inline __attribute__ ((always_inline))
#endif
extern long int testandset (int *spinlock);
extern int __compare_and_swap (long int *p, long int oldval, long int newval);
/* Spinlock implementation; required. */
PT_EI long int
testandset (int *spinlock)
{
int ret;
__asm__ __volatile__("ldstub %1,%0"
: "=r" (ret), "=m" (*spinlock) : "m" (*spinlock));
return ret;
}
/* Memory barrier; default is to do nothing */
#define MEMORY_BARRIER() \
__asm__ __volatile__("membar #LoadLoad | #LoadStore | #StoreLoad | #StoreStore" : : : "memory")
/* Read barrier. */
#define READ_MEMORY_BARRIER() \
__asm__ __volatile__("membar #LoadLoad | #LoadStore" : : : "memory")
/* Write barrier. */
#define WRITE_MEMORY_BARRIER() \
__asm__ __volatile__("membar #StoreLoad | #StoreStore" : : : "memory")
/* 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 + (2 * 128))
register char *stack_pointer __asm__ ("%sp");
/* Registers %g6 and %g7 are reserved by the ABI for "system use". The
TLS ABI specifies %g7 as the thread pointer. */
struct _pthread_descr_struct;
register struct _pthread_descr_struct *__thread_self __asm__ ("%g7");
/* Return the thread descriptor for the current thread. */
#define THREAD_SELF __thread_self
/* Initialize the thread-unique value. */
#define INIT_THREAD_SELF(descr, nr) (__thread_self = (descr))
/* 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)
{
long int readval;
__asm__ __volatile__ ("casx [%4], %2, %0"
: "=r"(readval), "=m"(*p)
: "r"(oldval), "m"(*p), "r"(p), "0"(newval));
MEMORY_BARRIER();
return readval == oldval;
}
/* Access to data in the thread descriptor is easy. */
#define THREAD_GETMEM(descr, member) \
((void) sizeof (descr), THREAD_SELF->member)
#define THREAD_GETMEM_NC(descr, member) \
((void) sizeof (descr), THREAD_SELF->member)
#define THREAD_SETMEM(descr, member, value) \
((void) sizeof (descr), THREAD_SELF->member = (value))
#define THREAD_SETMEM_NC(descr, member, value) \
((void) sizeof (descr), THREAD_SELF->member = (value))
/* 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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