1 /* Machine-dependent pthreads configuration and inline functions.
3 Copyright (C) 1996-1998, 2000-2003 Free Software Foundation, Inc.
4 This file is part of the GNU C Library.
5 Contributed by Richard Henderson <rth@tamu.edu>.
7 The GNU C Library is free software; you can redistribute it and/or
8 modify it under the terms of the GNU Lesser General Public License as
9 published by the Free Software Foundation; either version 2.1 of the
10 License, or (at your option) any later version.
12 The GNU C Library is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 Lesser General Public License for more details.
17 You should have received a copy of the GNU Lesser General Public
18 License along with the GNU C Library; see the file COPYING.LIB. If
19 not, see <http://www.gnu.org/licenses/>. */
22 #define _PT_MACHINE_H 1
25 # define PT_EI __extern_always_inline
28 extern long int testandset (int *spinlock);
29 extern int __compare_and_swap (long int *p, long int oldval, long int newval);
31 /* Spinlock implementation; required. */
33 testandset (int *spinlock)
37 __asm__ __volatile__("ldstub %1,%0"
38 : "=r"(ret), "=m"(*spinlock)
45 /* Memory barrier; default is to do nothing */
46 #define MEMORY_BARRIER() __asm__ __volatile__("stbar" : : : "memory")
49 /* Get some notion of the current stack. Need not be exactly the top
50 of the stack, just something somewhere in the current frame. */
51 #define CURRENT_STACK_FRAME (stack_pointer + (2 * 64))
52 register char *stack_pointer __asm__("%sp");
55 /* Registers %g6 and %g7 are reserved by the ABI for "system use".
56 %g7 is specified in the TLS ABI as thread pointer -- we do the same. */
57 struct _pthread_descr_struct;
58 register struct _pthread_descr_struct *__thread_self __asm__("%g7");
60 /* Return the thread descriptor for the current thread. */
61 #define THREAD_SELF __thread_self
63 /* Initialize the thread-unique value. */
64 #define INIT_THREAD_SELF(descr, nr) (__thread_self = (descr))
66 /* Access to data in the thread descriptor is easy. */
67 #define THREAD_GETMEM(descr, member) \
68 ((void) sizeof (descr), THREAD_SELF->member)
69 #define THREAD_GETMEM_NC(descr, member) \
70 ((void) sizeof (descr), THREAD_SELF->member)
71 #define THREAD_SETMEM(descr, member, value) \
72 ((void) sizeof (descr), THREAD_SELF->member = (value))
73 #define THREAD_SETMEM_NC(descr, member, value) \
74 ((void) sizeof (descr), THREAD_SELF->member = (value))
76 /* We want the OS to assign stack addresses. */
77 #define FLOATING_STACKS 1
79 /* Maximum size of the stack if the rlimit is unlimited. */
80 #define ARCH_STACK_MAX_SIZE 8*1024*1024
82 #endif /* pt-machine.h */