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Diffstat (limited to 'libpthread/linuxthreads/sysdeps/powerpc/powerpc32/pt-machine.h')
| -rw-r--r-- | libpthread/linuxthreads/sysdeps/powerpc/powerpc32/pt-machine.h | 120 |
1 files changed, 120 insertions, 0 deletions
diff --git a/libpthread/linuxthreads/sysdeps/powerpc/powerpc32/pt-machine.h b/libpthread/linuxthreads/sysdeps/powerpc/powerpc32/pt-machine.h new file mode 100644 index 000000000..8363d16d0 --- /dev/null +++ b/libpthread/linuxthreads/sysdeps/powerpc/powerpc32/pt-machine.h @@ -0,0 +1,120 @@ +/* Machine-dependent pthreads configuration and inline functions. + powerpc version. + Copyright (C) 1996, 1997, 1998, 2000, 2001, 2002, 2003 + 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. */ + +/* These routines are from Appendix G of the 'PowerPC 601 RISC Microprocessor + User's Manual', by IBM and Motorola. */ + +#ifndef _PT_MACHINE_H +#define _PT_MACHINE_H 1 + +#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); + +/* For multiprocessor systems, we want to ensure all memory accesses + are completed before we reset a lock. On other systems, we still + need to make sure that the compiler has flushed everything to memory. */ +#define MEMORY_BARRIER() __asm__ __volatile__ ("sync" : : : "memory") + +/* 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 8*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. */ +#define CURRENT_STACK_FRAME stack_pointer +register char * stack_pointer __asm__ ("r1"); + +/* Register r2 (tp) is reserved by the ABI as "thread pointer". */ +struct _pthread_descr_struct; +register struct _pthread_descr_struct *__thread_self __asm__("r2"); + +/* 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) (descr), THREAD_SELF->member) +#define THREAD_GETMEM_NC(descr, member) \ + ((void) (descr), THREAD_SELF->member) +#define THREAD_SETMEM(descr, member, value) \ + ((void) (descr), THREAD_SELF->member = (value)) +#define THREAD_SETMEM_NC(descr, member, value) \ + ((void) (descr), THREAD_SELF->member = (value)) + +/* Compare-and-swap for semaphores. */ +/* note that test-and-set(x) is the same as !compare-and-swap(x, 0, 1) */ + +#define HAS_COMPARE_AND_SWAP_WITH_RELEASE_SEMANTICS +#define IMPLEMENT_TAS_WITH_CAS + +PT_EI int +__compare_and_swap (long int *p, long int oldval, long int newval) +{ + int ret; + + __asm__ __volatile__ ( + "0: lwarx %0,0,%1 ;" + " xor. %0,%3,%0;" + " bne 1f;" + " stwcx. %2,0,%1;" + " bne- 0b;" + "1: " + : "=&r"(ret) + : "r"(p), "r"(newval), "r"(oldval) + : "cr0", "memory"); + /* This version of __compare_and_swap is to be used when acquiring + a lock, so we don't need to worry about whether other memory + operations have completed, but we do need to be sure that any loads + after this point really occur after we have acquired the lock. */ + __asm__ __volatile__ ("isync" : : : "memory"); + return ret == 0; +} + +PT_EI int +__compare_and_swap_with_release_semantics (long int *p, + long int oldval, long int newval) +{ + int ret; + + MEMORY_BARRIER (); + __asm__ __volatile__ ( + "0: lwarx %0,0,%1 ;" + " xor. %0,%3,%0;" + " bne 1f;" + " stwcx. %2,0,%1;" + " bne- 0b;" + "1: " + : "=&r"(ret) + : "r"(p), "r"(newval), "r"(oldval) + : "cr0", "memory"); + return ret == 0; +} + +#endif /* pt-machine.h */ |