1 /* Machine-dependent pthreads configuration and inline functions.
2 C6x version.
3 Copyright (C) 2004 Free Software Foundation, Inc.
4 This file is part of the GNU C Library.
5 Contributed by Aurelien Jacquiot <aurelien.jacquiot@jaluna.com>.
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
19 not, see <http://www.gnu.org/licenses/>. */
20
21 #ifndef _PT_MACHINE_H
22 #define _PT_MACHINE_H 1
23
24 #ifndef PT_EI
25 # define PT_EI extern inline
26 #endif
27
28 extern int __compare_and_swap (long int *p, long int oldval, long int newval);
29
30 /* Spinlock implementation; required. */
31 static inline long int
testandset(int * spinlock)32 testandset (int *spinlock)
33 {
34 register unsigned int ret = 1;
35 int dummy;
36 __asm__ __volatile__ ("mvc .s2 CSR, %0\n\tand .s2 -2, %0, %0\n\tmvc .s2 %0, CSR\n"
37 : "=b" (dummy));
38
39 if (*spinlock == 0) {
40 *spinlock = 1;
41 ret = 0;
42 }
43 __asm__ __volatile__ ("mvc .s2 CSR, %0\n\tor .s2 1, %0, %0\n\tmvc .s2 %0, CSR\n"
44 : "=b" (dummy));
45 return ret;
46 }
47
48 #define WRITE_MEMORY_BARRIER()
49 #define READ_MEMORY_BARRIER()
50
51 /* Get some notion of the current stack. Need not be exactly the top
52 of the stack, just something somewhere in the current frame. */
53 #define CURRENT_STACK_FRAME get_stack_pointer()
get_stack_pointer(void)54 static inline char * get_stack_pointer(void)
55 {
56 char *sp;
57 __asm__ __volatile__ ("mv .d2 B15, %0" : "=b" (sp));
58 return sp;
59 }
60
61 #define THREAD_STACK_OFFSET 8
62
63 #endif /* pt-machine.h */
64