| yuezonghe | 824eb0c | 2024-06-27 02:32:26 -0700 | [diff] [blame] | 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 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 | #ifndef PT_EI |
| 26 | # define PT_EI extern inline |
| 27 | #endif |
| 28 | |
| 29 | extern int __compare_and_swap (long int *p, long int oldval, long int newval); |
| 30 | |
| 31 | /* Spinlock implementation; required. */ |
| 32 | static inline long int |
| 33 | testandset (int *spinlock) |
| 34 | { |
| 35 | register unsigned int ret = 1; |
| 36 | int dummy; |
| 37 | __asm__ __volatile__ ("mvc .s2 CSR, %0\n\tand .s2 -2, %0, %0\n\tmvc .s2 %0, CSR\n" |
| 38 | : "=b" (dummy)); |
| 39 | |
| 40 | if (*spinlock == 0) { |
| 41 | *spinlock = 1; |
| 42 | ret = 0; |
| 43 | } |
| 44 | __asm__ __volatile__ ("mvc .s2 CSR, %0\n\tor .s2 1, %0, %0\n\tmvc .s2 %0, CSR\n" |
| 45 | : "=b" (dummy)); |
| 46 | return ret; |
| 47 | } |
| 48 | |
| 49 | #define WRITE_MEMORY_BARRIER() |
| 50 | #define READ_MEMORY_BARRIER() |
| 51 | |
| 52 | /* Get some notion of the current stack. Need not be exactly the top |
| 53 | of the stack, just something somewhere in the current frame. */ |
| 54 | #define CURRENT_STACK_FRAME get_stack_pointer() |
| 55 | static inline char * get_stack_pointer(void) |
| 56 | { |
| 57 | char *sp; |
| 58 | __asm__ __volatile__ ("mv .d2 B15, %0" : "=b" (sp)); |
| 59 | return sp; |
| 60 | } |
| 61 | |
| 62 | #define THREAD_STACK_OFFSET 8 |
| 63 | |
| 64 | #endif /* pt-machine.h */ |