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/* Machine-dependent pthreads configuration and inline functions.
Alpha version.
Copyright (C) 1996, 1997, 1998, 2000, 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
#ifdef __linux__
# include <asm/pal.h>
#else
# include <machine/pal.h>
#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__("$30");
/* Memory barrier; default is to do nothing */
#define MEMORY_BARRIER() __asm__ __volatile__("mb" : : : "memory")
/* Write barrier. */
#define WRITE_MEMORY_BARRIER() __asm__ __volatile__("wmb" : : : "memory")
/* Spinlock implementation; required. */
PT_EI long int
testandset (int *spinlock)
{
long int ret, temp;
__asm__ __volatile__(
"/* Inline spinlock test & set */\n"
"1:\t"
"ldl_l %0,%3\n\t"
"bne %0,2f\n\t"
"or $31,1,%1\n\t"
"stl_c %1,%2\n\t"
"beq %1,1b\n"
"2:\tmb\n"
"/* End spinlock test & set */"
: "=&r"(ret), "=&r"(temp), "=m"(*spinlock)
: "m"(*spinlock)
: "memory");
return ret;
}
/* Begin allocating thread stacks at this address. Default is to allocate
them just below the initial program stack. */
#define THREAD_STACK_START_ADDRESS 0x40000000000
/* Return the thread descriptor for the current thread. */
#define THREAD_SELF \
({ \
register pthread_descr __self __asm__("$0"); \
__asm__ ("call_pal %1" : "=r"(__self) : "i"(PAL_rduniq)); \
__self; \
})
/* Initialize the thread-unique value. */
#define INIT_THREAD_SELF(descr, nr) \
{ \
register pthread_descr __self __asm__("$16") = (descr); \
__asm__ __volatile__ ("call_pal %1" : : "r"(__self), "i"(PAL_wruniq)); \
}
/* 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 ret;
__asm__ __volatile__ (
"/* Inline compare & swap */\n"
"1:\t"
"ldq_l %0,%4\n\t"
"cmpeq %0,%2,%0\n\t"
"beq %0,2f\n\t"
"mov %3,%0\n\t"
"stq_c %0,%1\n\t"
"beq %0,1b\n\t"
"2:\tmb\n"
"/* End compare & swap */"
: "=&r"(ret), "=m"(*p)
: "r"(oldval), "r"(newval), "m"(*p)
: "memory");
return ret;
}
/* 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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