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/* Machine-dependent pthreads configuration and inline functions.
IA-64 version.
Copyright (C) 1999, 2000, 2002, 2003, 2004 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; see the file COPYING.LIB. If
not, see <http://www.gnu.org/licenses/>. */
#ifndef _PT_MACHINE_H
#define _PT_MACHINE_H 1
#include <features.h>
#include <ia64intrin.h>
#ifndef PT_EI
# define PT_EI __extern_always_inline
#endif
/* Make sure gcc doesn't try to be clever and move things around on
us. We need to use _exactly_ the address the user gave us, not some
alias that contains the same information. */
#define __atomic_fool_gcc(x) (*(__volatile__ struct { int a[100]; } *)x)
#ifndef ELF_MACHINE_NAME
#define NEED_SEPARATE_REGISTER_STACK
/* 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
/* Get some notion of the current stack. Need not be exactly the top
of the stack, just something somewhere in the current frame.
r12 (sp) is the stack pointer. */
#define CURRENT_STACK_FRAME stack_pointer
register char *stack_pointer __asm__ ("sp");
/* Register r13 (tp) is reserved by the ABI as "thread pointer". */
struct _pthread_descr_struct;
register struct _pthread_descr_struct *__thread_self __asm__("r13");
/* 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))
/* 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))
/* Memory barrier */
#define MEMORY_BARRIER() __sync_synchronize ()
#define HAS_COMPARE_AND_SWAP_WITH_RELEASE_SEMANTICS
PT_EI int
__compare_and_swap (long int *p, long int oldval, long int newval)
{
long int readval;
__asm__ __volatile__
("mov ar.ccv=%4;;\n\t"
"cmpxchg8.acq %0=%1,%2,ar.ccv"
: "=r" (readval), "=m" (__atomic_fool_gcc (p))
: "r"(newval), "m" (__atomic_fool_gcc (p)), "r" (oldval)
: "memory");
return readval == oldval;
}
PT_EI int
__compare_and_swap_with_release_semantics (long int *p,
long int oldval,
long int newval)
{
long int readval;
__asm__ __volatile__
("mov ar.ccv=%4;;\n\t"
"cmpxchg8.rel %0=%1,%2,ar.ccv"
: "=r" (readval), "=m" (__atomic_fool_gcc (p))
: "r"(newval), "m" (__atomic_fool_gcc (p)), "r" (oldval)
: "memory");
return readval == oldval;
}
#endif /* ELF_MACHINE_NAME */
/* Spinlock implementation; required. */
PT_EI long int
testandset (int *spinlock)
{
long int ret;
__asm__ __volatile__(
"xchg4 %0=%1,%2"
: "=r"(ret), "=m"(__atomic_fool_gcc (spinlock))
: "r"(1), "m"(__atomic_fool_gcc (spinlock))
: "memory");
return ret;
}
/* Indicate that we are looping. */
#define BUSY_WAIT_NOP __asm__ ("hint @pause")
#endif /* pt-machine.h */
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