blob: 793f80b2d761f038b808fc986187e1d780a86c7c [file] [log] [blame]
yuezonghe824eb0c2024-06-27 02:32:26 -07001/* Machine-dependent pthreads configuration and inline functions.
2 SuperH version.
3 Copyright (C) 1999, 2000, 2001, 2002, 2003 Free Software Foundation, Inc.
4 This file is part of the GNU C Library.
5 Contributed by Niibe Yutaka <gniibe@m17n.org>.
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#include <features.h>
26
27#ifndef __ASSEMBLER__
28#ifndef PT_EI
29# define PT_EI __extern_always_inline
30#endif
31
32extern long int testandset (int *spinlock);
33
34/* Spinlock implementation; required. */
35PT_EI long int
36testandset (int *spinlock)
37{
38 int ret;
39
40 __asm__ __volatile__(
41 "tas.b @%1\n\t"
42 "movt %0"
43 : "=r" (ret)
44 : "r" (spinlock)
45 : "memory", "cc");
46
47 return (ret == 0);
48}
49
50/* We want the OS to assign stack addresses. */
51#define FLOATING_STACKS 1
52
53/* Maximum size of the stack if the rlimit is unlimited. */
54#define ARCH_STACK_MAX_SIZE 32*1024*1024
55
56/* Get some notion of the current stack. Need not be exactly the top
57 of the stack, just something somewhere in the current frame. */
58#define CURRENT_STACK_FRAME stack_pointer
59register char * stack_pointer __asm__ ("r15");
60
61/* Return the thread descriptor for the current thread. */
62struct _pthread_descr_struct;
63#define THREAD_SELF \
64 ({ struct _pthread_descr_struct *self; \
65 __asm__("stc gbr,%0" : "=r" (self)); self;})
66
67/* Initialize the thread-unique value. */
68#define INIT_THREAD_SELF(descr, nr) \
69 ({ __asm__ __volatile__("ldc %0,gbr" : : "r" (descr));})
70
71/* Access to data in the thread descriptor is easy. */
72#define THREAD_GETMEM(descr, member) \
73 ((void) sizeof (descr), THREAD_SELF->member)
74#define THREAD_GETMEM_NC(descr, member) \
75 ((void) sizeof (descr), THREAD_SELF->member)
76#define THREAD_SETMEM(descr, member, value) \
77 ((void) sizeof (descr), THREAD_SELF->member = (value))
78#define THREAD_SETMEM_NC(descr, member, value) \
79 ((void) sizeof (descr), THREAD_SELF->member = (value))
80#endif /* __ASSEMBLER__ */
81
82#endif /* pt-machine.h */