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1 | /* Machine-dependent pthreads configuration and inline functions. |
2 | Sparc v9 version. | |
3 | Copyright (C) 1997 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 Library General Public License as | |
9 | published by the Free Software Foundation; either version 2 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 | Library General Public License for more details. | |
16 | ||
17 | You should have received a copy of the GNU Library General Public | |
18 | License along with the GNU C Library; see the file COPYING.LIB. If | |
19 | not, write to the Free Software Foundation, Inc., | |
20 | 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ | |
21 | ||
22 | ||
23 | /* Spinlock implementation; required. */ | |
24 | extern inline int | |
25 | testandset (int *spinlock) | |
26 | { | |
27 | int ret; | |
28 | ||
29 | __asm__ __volatile__("ldstub %1,%0" | |
30 | : "=r"(ret), "=m"(*spinlock) : "m"(*spinlock)); | |
31 | ||
32 | return ret; | |
33 | } | |
34 | ||
35 | ||
36 | /* Get some notion of the current stack. Need not be exactly the top | |
37 | of the stack, just something somewhere in the current frame. */ | |
38 | #define CURRENT_STACK_FRAME stack_pointer | |
39 | register char * stack_pointer __asm__ ("%sp"); | |
40 | ||
41 | ||
42 | /* Registers %g6 and %g7 are reserved by the ABI for "system use". It | |
43 | happens that Solaris uses %g6 for the thread pointer -- we do the same. */ | |
44 | struct _pthread_descr_struct; | |
45 | register struct _pthread_descr_struct *__thread_self __asm__("%g6"); | |
46 | ||
47 | /* Return the thread descriptor for the current thread. */ | |
48 | #define THREAD_SELF __thread_self | |
49 | ||
50 | /* Initialize the thread-unique value. */ | |
51 | #define INIT_THREAD_SELF(descr) (__thread_self = (descr)) | |
52 | ||
53 | ||
54 | /* Compare-and-swap for semaphores. */ | |
55 | ||
56 | #define HAS_COMPARE_AND_SWAP | |
57 | extern inline int | |
58 | __compare_and_swap (long int *p, long int oldval, long int newval) | |
59 | { | |
60 | long int readval; | |
61 | ||
62 | __asm__ __volatile__ ("cas %1, %2, %0" | |
63 | : "=r"(readval), "=m"(*p) | |
64 | : "r"(oldval), "m"(*p), "0"(newval)); | |
65 | ||
66 | return readval == newval; | |
67 | } |