1 /* Machine-dependent pthreads configuration and inline functions.
2 m68k version.
3 Copyright (C) 1996, 1998, 2000, 2002, 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
19 not, see <http://www.gnu.org/licenses/>. */
20
21 #ifndef _PT_MACHINE_H
22 #define _PT_MACHINE_H 1
23
24 #include <features.h>
25
26 #ifndef PT_EI
27 # define PT_EI __extern_always_inline
28 #endif
29
30 /* Spinlock implementation; required. */
31 PT_EI long int
testandset(int * spinlock)32 testandset (int *spinlock)
33 {
34 char ret;
35
36 __asm__ __volatile__(
37 #if !defined(__mcoldfire__) && !defined(__mcf5200__) && !defined(__m68000)
38 "tas %1; sne %0"
39 #else
40 "bset #7,%1; sne %0"
41 #endif
42 : "=&dm"(ret), "=m"(*spinlock)
43 : "m"(*spinlock)
44 : "cc");
45
46 return ret;
47 }
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
53 register char * stack_pointer __asm__ ("%sp");
54
55
56 /* Compare-and-swap for semaphores. */
57
58 #if !defined(__mcoldfire__) && !defined(__mcf5200__) && !defined(__mc68000)
59 #define HAS_COMPARE_AND_SWAP
60 PT_EI int
__compare_and_swap(long int * p,long int oldval,long int newval)61 __compare_and_swap (long int *p, long int oldval, long int newval)
62 {
63 char ret;
64 long int readval;
65
66 __asm__ __volatile__ ("casl %2, %3, %1; seq %0"
67 : "=dm" (ret), "=m" (*p), "=d" (readval)
68 : "d" (newval), "m" (*p), "2" (oldval));
69
70 return ret;
71 }
72 #endif
73
74 #endif /* pt-machine.h */
75