| yuezonghe | 824eb0c | 2024-06-27 02:32:26 -0700 | [diff] [blame] | 1 | /* Machine-dependent pthreads configuration and inline functions. |
| 2 | m68k version. |
| 3 | Copyright (C) 1996, 1998, 2000, 2002, 2003 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 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 |
| 19 | not, write to the Free Software Foundation, Inc., |
| 20 | 59 Temple Place - Suite 330, 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 PT_EI |
| 28 | # define PT_EI __extern_always_inline |
| 29 | #endif |
| 30 | |
| 31 | /* Spinlock implementation; required. */ |
| 32 | PT_EI long int |
| 33 | testandset (int *spinlock) |
| 34 | { |
| 35 | char ret; |
| 36 | |
| 37 | __asm__ __volatile__( |
| 38 | #if !defined(__mcoldfire__) && !defined(__mcf5200__) && !defined(__m68000) |
| 39 | "tas %1; sne %0" |
| 40 | #else |
| 41 | "bset #7,%1; sne %0" |
| 42 | #endif |
| 43 | : "=&dm"(ret), "=m"(*spinlock) |
| 44 | : "m"(*spinlock) |
| 45 | : "cc"); |
| 46 | |
| 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 | #define CURRENT_STACK_FRAME stack_pointer |
| 54 | register char * stack_pointer __asm__ ("%sp"); |
| 55 | |
| 56 | |
| 57 | /* Compare-and-swap for semaphores. */ |
| 58 | |
| 59 | #if !defined(__mcoldfire__) && !defined(__mcf5200__) && !defined(__mc68000) |
| 60 | #define HAS_COMPARE_AND_SWAP |
| 61 | PT_EI int |
| 62 | __compare_and_swap (long int *p, long int oldval, long int newval) |
| 63 | { |
| 64 | char ret; |
| 65 | long int readval; |
| 66 | |
| 67 | __asm__ __volatile__ ("casl %2, %3, %1; seq %0" |
| 68 | : "=dm" (ret), "=m" (*p), "=d" (readval) |
| 69 | : "d" (newval), "m" (*p), "2" (oldval)); |
| 70 | |
| 71 | return ret; |
| 72 | } |
| 73 | #endif |
| 74 | |
| 75 | #endif /* pt-machine.h */ |