1 /* Machine-dependent pthreads configuration and inline functions.
2 OpenRISC version.
3 Copyright (C) 2001, 2002, 2003 Free Software Foundation, Inc.
4 This file is part of the GNU C Library.
5
6 The GNU C Library is free software; you can redistribute it and/or
7 modify it under the terms of the GNU Lesser General Public License as
8 published by the Free Software Foundation; either version 2.1 of the
9 License, or (at your option) any later version.
10
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 Lesser General Public License for more details.
15
16 You should have received a copy of the GNU Lesser General Public
17 License along with the GNU C Library; see the file COPYING.LIB. If not,
18 see <http://www.gnu.org/licenses/>. */
19
20 #ifndef _PT_MACHINE_H
21 #define _PT_MACHINE_H 1
22
23 #include <features.h>
24 #include <sys/syscall.h>
25
26 #ifndef PT_EI
27 # define PT_EI __extern_always_inline
28 #endif
29
30 PT_EI long int testandset(int*);
31
32 #define OR1K_ATOMIC_XCHG 1
33
34 PT_EI long int
testandset(int * spinlock)35 testandset (int *spinlock)
36 {
37 int oldvalue = 1;
38
39 INLINE_SYSCALL(or1k_atomic, 3, OR1K_ATOMIC_XCHG, spinlock, &oldvalue);
40
41 return (oldvalue);
42 }
43
44 /* Get some notion of the current stack. Need not be exactly the top
45 of the stack, just something somewhere in the current frame. */
46 #define CURRENT_STACK_FRAME stack_pointer()
stack_pointer(void)47 static inline char *stack_pointer(void)
48 {
49 unsigned long ret;
50 __asm__ __volatile__ ("l.ori %0, r1, 0" : "=r" (ret));
51 return (char *)ret;
52 }
53 #endif /* pt-machine.h */
54