1 /* Machine-dependent pthreads configuration and inline functions.
2 nios2 version.
3 Copyright (C) 1996, 1998, 2000, 2002 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
18 not, see <http://www.gnu.org/licenses/>. */
19
20 #ifndef _PT_MACHINE_H
21 #define _PT_MACHINE_H 1
22
23 #include <features.h>
24
25 #ifndef PT_EI
26 # define PT_EI __extern_always_inline
27 #endif
28
29 /* Spinlock implementation; required. */
30 PT_EI long int
testandset(int * spinlock)31 testandset (int *spinlock)
32 {
33 unsigned int scratch;
34 long int ret=-2;
35
36 __asm__ __volatile__(
37 "rdctl %0, status\n\t"
38 "and %0, %0, %1\n\t"
39 "wrctl status, %0 #disable interrupts\n\t"
40 "ldw %1, 0(%4)\n\t"
41 "stw %3, 0(%4)\n\t"
42 "ori %0, %0, 1\n\t"
43 "wrctl status, %0 #enable interrupts\n\t"
44 : "=&r"(scratch), "=r"(ret)
45 : "1"(ret), "r"(1), "r"(spinlock)
46 : "memory");
47
48 return ret;
49 }
50
51
52 /* Get some notion of the current stack. Need not be exactly the top
53 of the stack, just something somewhere in the current frame. */
54 #define CURRENT_STACK_FRAME stack_pointer
55 register char * stack_pointer __asm__ ("%sp");
56
57 #endif /* pt-machine.h */
58