1 /* Machine-dependent pthreads configuration and inline functions.
3 Copyright (C) 2002, 2003 Free Software Foundation, Inc.
4 This file is part of the GNU C Library.
6 The GNU C Library is free software; you can redistribute it and/or
7 modify it under the terms of the GNU Library General Public License as
8 published by the Free Software Foundation; either version 2 of the
9 License, or (at your option) any later version.
11 The GNU C Library is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 Library General Public License for more details.
16 You should have received a copy of the GNU Library General Public
17 License along with the GNU C Library; see the file COPYING.LIB. If
18 not, see <http://www.gnu.org/licenses/>. */
20 /* These routines are from Appendix G of the 'PowerPC 601 RISC Microprocessor
21 User's Manual', by IBM and Motorola. */
24 #define _PT_MACHINE_H 1
27 # define PT_EI __extern_always_inline
30 extern long int testandset (int *spinlock);
31 extern int __compare_and_swap (long int *p, long int oldval, long int newval);
32 extern int __compare_and_swap32 (int *p, int oldval, int newval);
34 /* For multiprocessor systems, we want to ensure all memory accesses
35 are completed before we reset a lock. On other systems, we still
36 need to make sure that the compiler has flushed everything to memory. */
37 #define MEMORY_BARRIER() __asm__ __volatile__ ("lwsync" : : : "memory")
38 #define READ_MEMORY_BARRIER() __asm__ __volatile__ ("lwsync" : : : "memory")
39 #define WRITE_MEMORY_BARRIER() __asm__ __volatile__ ("eieio" : : : "memory")
41 /* We want the OS to assign stack addresses. */
42 #define FLOATING_STACKS 1
44 /* Maximum size of the stack if the rlimit is unlimited. */
45 #define ARCH_STACK_MAX_SIZE 16*1024*1024
47 /* Get some notion of the current stack. Need not be exactly the top
48 of the stack, just something somewhere in the current frame. */
49 #define CURRENT_STACK_FRAME stack_pointer
50 register char * stack_pointer __asm__ ("r1");
52 /* Register r13 (tp) is reserved by the ABI as "thread pointer". */
53 struct _pthread_descr_struct;
54 register struct _pthread_descr_struct *__thread_self __asm__("r13");
56 /* Return the thread descriptor for the current thread. */
57 #define THREAD_SELF __thread_self
59 /* Initialize the thread-unique value. */
60 #define INIT_THREAD_SELF(descr, nr) (__thread_self = (descr))
62 /* Access to data in the thread descriptor is easy. */
63 #define THREAD_GETMEM(descr, member) \
64 ((void) (descr), THREAD_SELF->member)
65 #define THREAD_GETMEM_NC(descr, member) \
66 ((void) (descr), THREAD_SELF->member)
67 #define THREAD_SETMEM(descr, member, value) \
68 ((void) (descr), THREAD_SELF->member = (value))
69 #define THREAD_SETMEM_NC(descr, member, value) \
70 ((void) (descr), THREAD_SELF->member = (value))
72 /* Compare-and-swap for semaphores. */
73 /* note that test-and-set(x) is the same as !compare-and-swap(x, 0, 1) */
75 #define HAS_COMPARE_AND_SWAP
76 #define HAS_COMPARE_AND_SWAP_WITH_RELEASE_SEMANTICS
79 __compare_and_swap (long int *p, long int oldval, long int newval)
83 __asm__ __volatile__ (
91 : "r"(p), "r"(newval), "r"(oldval)
93 /* This version of __compare_and_swap is to be used when acquiring
94 a lock, so we don't need to worry about whether other memory
95 operations have completed, but we do need to be sure that any loads
96 after this point really occur after we have acquired the lock. */
97 __asm__ __volatile__ ("isync" : : : "memory");
98 return (int)(ret == 0);
102 __compare_and_swap_with_release_semantics (long int *p,
103 long int oldval, long int newval)
108 __asm__ __volatile__ (
116 : "r"(p), "r"(newval), "r"(oldval)
118 return (int)(ret == 0);
122 __compare_and_swap32 (int *p, int oldval, int newval)
126 __asm__ __volatile__ (
134 : "r"(p), "r"(newval), "r"(oldval)
136 /* This version of __compare_and_swap is to be used when acquiring
137 a lock, so we don't need to worry about whether other memory
138 operations have completed, but we do need to be sure that any loads
139 after this point really occur after we have acquired the lock. */
140 __asm__ __volatile__ ("isync" : : : "memory");
141 return (int)(ret == 0);
145 __compare_and_swap32_with_release_semantics (long int *p,
146 long int oldval, long int newval)
151 __asm__ __volatile__ (
159 : "r"(p), "r"(newval), "r"(oldval)
161 return (int)(ret == 0);
167 long int ret, val = 1;
170 __asm__ __volatile__ (
184 #endif /* pt-machine.h */