diff options
Diffstat (limited to 'linuxthreads/sysdeps/powerpc')
-rw-r--r-- | linuxthreads/sysdeps/powerpc/Implies | 1 | ||||
-rw-r--r-- | linuxthreads/sysdeps/powerpc/bits/semaphore.h | 32 | ||||
-rw-r--r-- | linuxthreads/sysdeps/powerpc/pt-machine.h | 84 |
3 files changed, 117 insertions, 0 deletions
diff --git a/linuxthreads/sysdeps/powerpc/Implies b/linuxthreads/sysdeps/powerpc/Implies new file mode 100644 index 0000000000..81e93666c4 --- /dev/null +++ b/linuxthreads/sysdeps/powerpc/Implies @@ -0,0 +1 @@ +pthread/cmpxchg diff --git a/linuxthreads/sysdeps/powerpc/bits/semaphore.h b/linuxthreads/sysdeps/powerpc/bits/semaphore.h new file mode 100644 index 0000000000..3770eedf15 --- /dev/null +++ b/linuxthreads/sysdeps/powerpc/bits/semaphore.h @@ -0,0 +1,32 @@ +/* Copyright (C) 1996, 1997 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 Library General Public License as + published by the Free Software Foundation; either version 2 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 + Library General Public License for more details. + + You should have received a copy of the GNU Library 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 _SEMAPHORE_H +# error "Never include <bits/semaphore.h> directly; use <semaphore.h> instead." +#endif + + +/* Due to the implementation of the load-locked/store-conditional + instructions, we cannot pack semaphores closer than a cache line + or risk threads deadlocking on unrelated semaphores. */ + +typedef struct + { + int sem_status; + int sem_reserved[7]; + } sem_t; diff --git a/linuxthreads/sysdeps/powerpc/pt-machine.h b/linuxthreads/sysdeps/powerpc/pt-machine.h new file mode 100644 index 0000000000..a08828b322 --- /dev/null +++ b/linuxthreads/sysdeps/powerpc/pt-machine.h @@ -0,0 +1,84 @@ +/* Machine-dependent pthreads configuration and inline functions. + powerpc version. + Copyright (C) 1996, 1997 Free Software Foundation, Inc. + This file is part of the GNU C Library. + Contributed by Richard Henderson <rth@tamu.edu>. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Library General Public License as + published by the Free Software Foundation; either version 2 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 + Library General Public License for more details. + + You should have received a copy of the GNU Library 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. */ + +/* For multiprocessor systems, we want to ensure all memory accesses + are completed before we reset a lock. */ +#if 0 +/* on non multiprocessor systems, you can just: */ +#define sync() /* nothing */ +#else +#define sync() __asm__ __volatile__ ("sync") +#endif + +/* Spinlock implementation; required. */ +extern inline int +testandset (int *spinlock) +{ + int ret; + + sync(); + __asm__ __volatile__( + "0: lwarx %0,0,%1 ;" + " cmpwi %0,0;" + " bne 1f;" + " stwcx. %2,0,%1;" + " bne- 0b;" + "1: " + : "=&r"(ret) + : "r"(spinlock), "r"(1) + : "cr0", "memory"); + sync(); + + return ret != 0; +} + + +/* 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"); + +/* 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 +extern inline int +__compare_and_swap (int *p, int oldval, int newval) +{ + int ret; + + sync(); + __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"); + sync(); + return ret == 0; +} |