| yuezonghe | 824eb0c | 2024-06-27 02:32:26 -0700 | [diff] [blame^] | 1 | /* Machine-dependent pthreads configuration and inline functions. |
| 2 | CRIS version. |
| 3 | Copyright (C) 2001, 2002, 2003 Free Software Foundation, Inc. |
| 4 | This file is part of the GNU C Library. |
| 5 | |
| 6 | The GNU C Library is free software; you can redistribute it and/or |
| 7 | modify it under the terms of the GNU Lesser General Public License as |
| 8 | published by the Free Software Foundation; either version 2.1 of the |
| 9 | License, or (at your option) any later version. |
| 10 | |
| 11 | The GNU C Library is distributed in the hope that it will be useful, |
| 12 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 14 | Lesser General Public License for more details. |
| 15 | |
| 16 | You should have received a copy of the GNU Lesser General Public |
| 17 | License along with the GNU C Library; see the file COPYING.LIB. If not, |
| 18 | write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, |
| 19 | Boston, MA 02111-1307, USA. */ |
| 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 | PT_EI long int |
| 31 | testandset (int *spinlock) |
| 32 | { |
| 33 | register unsigned long int ret; |
| 34 | |
| 35 | /* Note the use of a dummy output of *spinlock to expose the write. The |
| 36 | memory barrier is to stop *other* writes being moved past this code. */ |
| 37 | __asm__ __volatile__("clearf\n" |
| 38 | "0:\n\t" |
| 39 | "movu.b [%2],%0\n\t" |
| 40 | "ax\n\t" |
| 41 | "move.b %3,[%2]\n\t" |
| 42 | "bwf 0b\n\t" |
| 43 | "clearf" |
| 44 | : "=&r" (ret), "=m" (*spinlock) |
| 45 | : "r" (spinlock), "r" ((int) 1) |
| 46 | : "memory"); |
| 47 | return ret; |
| 48 | } |
| 49 | |
| 50 | |
| 51 | /* Get some notion of the current stack. Need not be exactly the top |
| 52 | of the stack, just something somewhere in the current frame. |
| 53 | I don't trust register variables, so let's do this the safe way. */ |
| 54 | #define CURRENT_STACK_FRAME \ |
| 55 | ({ char *sp; __asm__ ("move.d $sp,%0" : "=rm" (sp)); sp; }) |
| 56 | |
| 57 | #endif /* pt-machine.h */ |