1 /* Machine-dependent pthreads configuration and inline functions.
2 sparc version.
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>.
6
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.
11
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.
16
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 not,
19 write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
20 Boston, MA 02111-1307, USA. */
21
22 #ifndef _PT_MACHINE_H
23 #define _PT_MACHINE_H 1
24
25 #ifndef PT_EI
26 # define PT_EI __extern_always_inline
27 #endif
28
29 extern long int testandset (int *spinlock);
30 extern int __compare_and_swap (long int *p, long int oldval, long int newval);
31
32 /* Spinlock implementation; required. */
33 PT_EI long int
testandset(int * spinlock)34 testandset (int *spinlock)
35 {
36 int ret;
37
38 __asm__ __volatile__("ldstub %1,%0"
39 : "=r"(ret), "=m"(*spinlock)
40 : "m"(*spinlock));
41
42 return ret;
43 }
44
45
46 /* Memory barrier; default is to do nothing */
47 #define MEMORY_BARRIER() __asm__ __volatile__("stbar" : : : "memory")
48
49
50 /* Get some notion of the current stack. Need not be exactly the top
51 of the stack, just something somewhere in the current frame. */
52 #define CURRENT_STACK_FRAME (stack_pointer + (2 * 64))
53 register char *stack_pointer __asm__("%sp");
54
55
56 /* Registers %g6 and %g7 are reserved by the ABI for "system use".
57 %g7 is specified in the TLS ABI as thread pointer -- we do the same. */
58 struct pthread;
59 register struct pthread *__thread_self __asm__("%g7");
60
61 #ifdef not_for_l4
62 /* Return the thread descriptor for the current thread. */
63 #define THREAD_SELF __thread_self
64
65 /* Initialize the thread-unique value. */
66 #define INIT_THREAD_SELF(descr, nr) (__thread_self = (descr))
67
68 /* Access to data in the thread descriptor is easy. */
69 #define THREAD_GETMEM(descr, member) \
70 ((void) sizeof (descr), THREAD_SELF->member)
71 #define THREAD_GETMEM_NC(descr, member) \
72 ((void) sizeof (descr), THREAD_SELF->member)
73 #define THREAD_SETMEM(descr, member, value) \
74 ((void) sizeof (descr), THREAD_SELF->member = (value))
75 #define THREAD_SETMEM_NC(descr, member, value) \
76 ((void) sizeof (descr), THREAD_SELF->member = (value))
77 #endif
78
79 /* We want the OS to assign stack addresses. */
80 #define FLOATING_STACKS 1
81
82 /* Maximum size of the stack if the rlimit is unlimited. */
83 #define ARCH_STACK_MAX_SIZE 8*1024*1024
84
85 #endif /* pt-machine.h */
86