124 lines
3.4 KiB
C
124 lines
3.4 KiB
C
/* Machine-dependent pthreads configuration and inline functions.
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Alpha version.
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Copyright (C) 1996, 1997, 1998, 2000, 2002 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by Richard Henderson <rth@tamu.edu>.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public License as
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published by the Free Software Foundation; either version 2.1 of the
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License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; see the file COPYING.LIB. If not,
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write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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#ifndef _PT_MACHINE_H
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#define _PT_MACHINE_H 1
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#ifndef PT_EI
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# define PT_EI extern inline
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#endif
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#include <asm/pal.h>
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extern long int testandset (int *spinlock);
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extern int __compare_and_swap (long int *p, long int oldval, long int newval);
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/* Get some notion of the current stack. Need not be exactly the top
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of the stack, just something somewhere in the current frame. */
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#define CURRENT_STACK_FRAME stack_pointer
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register char *stack_pointer __asm__("$30");
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/* Memory barrier; default is to do nothing */
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#define MEMORY_BARRIER() __asm__ __volatile__("mb" : : : "memory")
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/* Write barrier. */
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#define WRITE_MEMORY_BARRIER() __asm__ __volatile__("wmb" : : : "memory")
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/* Spinlock implementation; required. */
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PT_EI long int
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testandset (int *spinlock)
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{
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long int ret, temp;
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__asm__ __volatile__(
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"/* Inline spinlock test & set */\n"
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"1:\t"
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"ldl_l %0,%3\n\t"
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"bne %0,2f\n\t"
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"or $31,1,%1\n\t"
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"stl_c %1,%2\n\t"
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"beq %1,1b\n"
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"2:\tmb\n"
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"/* End spinlock test & set */"
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: "=&r"(ret), "=&r"(temp), "=m"(*spinlock)
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: "m"(*spinlock)
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: "memory");
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return ret;
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}
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/* Begin allocating thread stacks at this address. Default is to allocate
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them just below the initial program stack. */
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#define THREAD_STACK_START_ADDRESS 0x40000000000
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/* Return the thread descriptor for the current thread. */
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#define THREAD_SELF \
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({ \
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register pthread_descr __self __asm__("$0"); \
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__asm__ ("call_pal %1" : "=r"(__self) : "i"(PAL_rduniq)); \
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__self; \
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})
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/* Initialize the thread-unique value. */
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#define INIT_THREAD_SELF(descr, nr) \
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{ \
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register pthread_descr __self __asm__("$16") = (descr); \
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__asm__ __volatile__ ("call_pal %1" : : "r"(__self), "i"(PAL_wruniq)); \
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}
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/* Compare-and-swap for semaphores. */
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#define HAS_COMPARE_AND_SWAP
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PT_EI int
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__compare_and_swap (long int *p, long int oldval, long int newval)
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{
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long int ret;
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__asm__ __volatile__ (
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"/* Inline compare & swap */\n"
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"1:\t"
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"ldq_l %0,%4\n\t"
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"cmpeq %0,%2,%0\n\t"
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"beq %0,2f\n\t"
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"mov %3,%0\n\t"
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"stq_c %0,%1\n\t"
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"beq %0,1b\n\t"
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"2:\tmb\n"
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"/* End compare & swap */"
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: "=&r"(ret), "=m"(*p)
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: "r"(oldval), "r"(newval), "m"(*p)
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: "memory");
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return ret;
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}
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/* We want the OS to assign stack addresses. */
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#define FLOATING_STACKS 1
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/* Maximum size of the stack if the rlimit is unlimited. */
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#define ARCH_STACK_MAX_SIZE 32*1024*1024
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#endif /* pt-machine.h */
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