/* 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, 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 #include <ia64intrin.h> #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); /* 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 */