127 lines
3.8 KiB
C
127 lines
3.8 KiB
C
/* Machine-dependent pthreads configuration and inline functions.
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IA-64 version.
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Copyright (C) 1999, 2000, 2002 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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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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#include <ia64intrin.h>
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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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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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/* Make sure gcc doesn't try to be clever and move things around on
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us. We need to use _exactly_ the address the user gave us, not some
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alias that contains the same information. */
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#define __atomic_fool_gcc(x) (*(volatile struct { int a[100]; } *)x)
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#ifndef ELF_MACHINE_NAME
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#define NEED_SEPARATE_REGISTER_STACK
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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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/* 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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r12 (sp) is the stack pointer. */
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#define CURRENT_STACK_FRAME stack_pointer
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register char *stack_pointer __asm__ ("sp");
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/* Register r13 (tp) is reserved by the ABI as "thread pointer". */
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struct _pthread_descr_struct;
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register struct _pthread_descr_struct *__thread_self __asm__("r13");
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/* Return the thread descriptor for the current thread. */
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#define THREAD_SELF __thread_self
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/* Initialize the thread-unique value. */
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#define INIT_THREAD_SELF(descr, nr) (__thread_self = (descr))
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/* Access to data in the thread descriptor is easy. */
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#define THREAD_GETMEM(descr, member) __thread_self->member
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#define THREAD_GETMEM_NC(descr, member) __thread_self->member
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#define THREAD_SETMEM(descr, member, value) __thread_self->member = (value)
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#define THREAD_SETMEM_NC(descr, member, value) __thread_self->member = (value)
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/* Memory barrier */
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#define MEMORY_BARRIER() __sync_synchronize ()
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#define HAS_COMPARE_AND_SWAP_WITH_RELEASE_SEMANTICS
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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 readval;
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__asm__ __volatile__
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("mov ar.ccv=%4;;\n\t"
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"cmpxchg8.acq %0=%1,%2,ar.ccv"
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: "=r" (readval), "=m" (__atomic_fool_gcc (p))
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: "r"(newval), "1" (__atomic_fool_gcc (p)), "r" (oldval)
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: "memory");
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return readval == oldval;
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}
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PT_EI int
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__compare_and_swap_with_release_semantics (long int *p,
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long int oldval,
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long int newval)
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{
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long int readval;
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__asm__ __volatile__
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("mov ar.ccv=%4;;\n\t"
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"cmpxchg8.rel %0=%1,%2,ar.ccv"
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: "=r" (readval), "=m" (__atomic_fool_gcc (p))
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: "r"(newval), "1" (__atomic_fool_gcc (p)), "r" (oldval)
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: "memory");
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return readval == oldval;
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}
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#endif /* ELF_MACHINE_NAME */
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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;
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__asm__ __volatile__(
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"xchg4 %0=%1,%2"
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: "=r"(ret), "=m"(__atomic_fool_gcc (spinlock))
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: "r"(1), "1"(__atomic_fool_gcc (spinlock))
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: "memory");
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return ret;
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}
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#endif /* pt-machine.h */
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