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5afdca00 UD |
1 | /* Machine-dependent pthreads configuration and inline functions. |
2 | Sparc v9 version. | |
a5a6f926 | 3 | Copyright (C) 1997, 1998, 1999, 2000 Free Software Foundation, Inc. |
5afdca00 UD |
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 | ||
9a29bc37 UD |
22 | #ifndef PT_EI |
23 | # define PT_EI extern inline | |
24 | #endif | |
25 | ||
5afdca00 UD |
26 | |
27 | /* Spinlock implementation; required. */ | |
9a29bc37 | 28 | PT_EI int |
5afdca00 UD |
29 | testandset (int *spinlock) |
30 | { | |
31 | int ret; | |
32 | ||
33 | __asm__ __volatile__("ldstub %1,%0" | |
34 | : "=r"(ret), "=m"(*spinlock) : "m"(*spinlock)); | |
35 | ||
36 | return ret; | |
37 | } | |
38 | ||
39 | ||
de262537 UD |
40 | /* Memory barrier; default is to do nothing */ |
41 | /* FIXME: is stbar OK, or should we use the more general membar instruction? | |
42 | If so, which mode to pass to membar? */ | |
43 | #define MEMORY_BARRIER() __asm__ __volatile__("stbar" : : : "memory") | |
a5a6f926 UD |
44 | /* Write barrier. */ |
45 | #define WRITE_MEMORY_BARRIER() \ | |
46 | __asm__ __volatile__("membar #StoreLoad | #StoreStore" : : : "memory") | |
de262537 UD |
47 | |
48 | ||
5afdca00 UD |
49 | /* Get some notion of the current stack. Need not be exactly the top |
50 | of the stack, just something somewhere in the current frame. */ | |
51 | #define CURRENT_STACK_FRAME stack_pointer | |
9a29bc37 | 52 | register char *stack_pointer __asm__ ("%sp"); |
5afdca00 UD |
53 | |
54 | ||
55 | /* Registers %g6 and %g7 are reserved by the ABI for "system use". It | |
56 | happens that Solaris uses %g6 for the thread pointer -- we do the same. */ | |
57 | struct _pthread_descr_struct; | |
58 | register struct _pthread_descr_struct *__thread_self __asm__("%g6"); | |
59 | ||
60 | /* Return the thread descriptor for the current thread. */ | |
61 | #define THREAD_SELF __thread_self | |
62 | ||
63 | /* Initialize the thread-unique value. */ | |
9c4c0024 | 64 | #define INIT_THREAD_SELF(descr, nr) (__thread_self = (descr)) |
5afdca00 UD |
65 | |
66 | ||
67 | /* Compare-and-swap for semaphores. */ | |
68 | ||
69 | #define HAS_COMPARE_AND_SWAP | |
9a29bc37 | 70 | PT_EI int |
5afdca00 UD |
71 | __compare_and_swap (long int *p, long int oldval, long int newval) |
72 | { | |
73 | long int readval; | |
74 | ||
1acf7665 | 75 | __asm__ __volatile__ ("casx [%4], %2, %0" |
5afdca00 | 76 | : "=r"(readval), "=m"(*p) |
2c68584c | 77 | : "r"(oldval), "m"(*p), "r"(p), "0"(newval)); |
de262537 | 78 | MEMORY_BARRIER(); |
1acf7665 | 79 | return readval == oldval; |
5afdca00 | 80 | } |
00a2f9aa UD |
81 | |
82 | /* Access to data in the thread descriptor is easy. */ | |
83 | #define THREAD_GETMEM(descr, member) __thread_self->member | |
75311719 | 84 | #define THREAD_GETMEM_NC(descr, member) __thread_self->member |
00a2f9aa | 85 | #define THREAD_SETMEM(descr, member, value) __thread_self->member = (value) |
75311719 | 86 | #define THREAD_SETMEM_NC(descr, member, value) __thread_self->member = (value) |