| yuezonghe | 824eb0c | 2024-06-27 02:32:26 -0700 | [diff] [blame] | 1 | /* Machine-dependent pthreads configuration and inline functions. |
| 2 | |
| 3 | Copyright (C) 1996, 1997, 1998, 2000, 2002, 2003, 2004 |
| 4 | Free Software Foundation, Inc. |
| 5 | This file is part of the GNU C Library. |
| 6 | Contributed by Ralf Baechle <ralf@gnu.org>. |
| 7 | Based on the Alpha version by Richard Henderson <rth@tamu.edu>. |
| 8 | |
| 9 | The GNU C Library is free software; you can redistribute it and/or |
| 10 | modify it under the terms of the GNU Lesser General Public License as |
| 11 | published by the Free Software Foundation; either version 2.1 of the |
| 12 | License, or (at your option) any later version. |
| 13 | |
| 14 | The GNU C Library is distributed in the hope that it will be useful, |
| 15 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 16 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 17 | Lesser General Public License for more details. |
| 18 | |
| 19 | You should have received a copy of the GNU Lesser General Public |
| 20 | License along with the GNU C Library; see the file COPYING.LIB. If |
| 21 | not, write to the Free Software Foundation, Inc., |
| 22 | 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ |
| 23 | |
| 24 | #ifndef _PT_MACHINE_H |
| 25 | #define _PT_MACHINE_H 1 |
| 26 | |
| 27 | #include <features.h> |
| 28 | |
| 29 | #ifndef PT_EI |
| 30 | # define PT_EI __extern_always_inline |
| 31 | #endif |
| 32 | |
| 33 | /* Copyright (C) 2000, 2002 Free Software Foundation, Inc. |
| 34 | This file is part of the GNU C Library. |
| 35 | Contributed by Maciej W. Rozycki <macro@ds2.pg.gda.pl>, 2000. */ |
| 36 | static __inline__ int |
| 37 | __NTH (_test_and_set (int *p, int v)) |
| 38 | { |
| 39 | int r, t; |
| 40 | |
| 41 | __asm__ __volatile__ |
| 42 | ("/* Inline test and set */\n" |
| 43 | "1:\n\t" |
| 44 | ".set push\n\t" |
| 45 | ".set mips2\n\t" |
| 46 | "ll %0,%3\n\t" |
| 47 | "move %1,%4\n\t" |
| 48 | "beq %0,%4,2f\n\t" |
| 49 | "sc %1,%2\n\t" |
| 50 | ".set pop\n\t" |
| 51 | "beqz %1,1b\n" |
| 52 | "2:\n\t" |
| 53 | "/* End test and set */" |
| 54 | : "=&r" (r), "=&r" (t), "=m" (*p) |
| 55 | : "m" (*p), "r" (v) |
| 56 | : "memory"); |
| 57 | |
| 58 | return r; |
| 59 | } |
| 60 | |
| 61 | |
| 62 | /* Spinlock implementation; required. */ |
| 63 | |
| 64 | PT_EI long int |
| 65 | testandset (int *spinlock) |
| 66 | { |
| 67 | return _test_and_set (spinlock, 1); |
| 68 | } |
| 69 | |
| 70 | |
| 71 | /* Get some notion of the current stack. Need not be exactly the top |
| 72 | of the stack, just something somewhere in the current frame. */ |
| 73 | #define CURRENT_STACK_FRAME stack_pointer |
| 74 | register char * stack_pointer __asm__ ("$29"); |
| 75 | |
| 76 | |
| 77 | /* Compare-and-swap for semaphores. */ |
| 78 | |
| 79 | #define HAS_COMPARE_AND_SWAP |
| 80 | PT_EI int |
| 81 | __compare_and_swap (long int *p, long int oldval, long int newval) |
| 82 | { |
| 83 | long int ret, temp; |
| 84 | |
| 85 | __asm__ __volatile__ |
| 86 | ("/* Inline compare & swap */\n" |
| 87 | "1:\n\t" |
| 88 | ".set push\n\t" |
| 89 | ".set mips2\n\t" |
| 90 | "ll %1,%5\n\t" |
| 91 | "move %0,$0\n\t" |
| 92 | "bne %1,%3,2f\n\t" |
| 93 | "move %0,%4\n\t" |
| 94 | "sc %0,%2\n\t" |
| 95 | ".set pop\n\t" |
| 96 | "beqz %0,1b\n" |
| 97 | "2:\n\t" |
| 98 | "/* End compare & swap */" |
| 99 | : "=&r" (ret), "=&r" (temp), "=m" (*p) |
| 100 | : "r" (oldval), "r" (newval), "m" (*p) |
| 101 | : "memory"); |
| 102 | |
| 103 | return ret; |
| 104 | } |
| 105 | |
| 106 | #endif /* pt-machine.h */ |