| yuezonghe | 824eb0c | 2024-06-27 02:32:26 -0700 | [diff] [blame] | 1 | /* Machine-dependent pthreads configuration and inline functions. |
| 2 | ARM version. |
| 3 | Copyright (C) 1997, 1998, 2000, 2002 Free Software Foundation, Inc. |
| 4 | This file is part of the GNU C Library. |
| 5 | Contributed by Philip Blundell <philb@gnu.org>. |
| 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 | #include <features.h> |
| 26 | |
| 27 | #ifndef PT_EI |
| 28 | # define PT_EI __extern_always_inline |
| 29 | #endif |
| 30 | |
| 31 | /* This will not work on ARM1 or ARM2 because SWP is lacking on those |
| 32 | machines. Unfortunately we have no way to detect this at compile |
| 33 | time; let's hope nobody tries to use one. */ |
| 34 | |
| 35 | /* Spinlock implementation; required. */ |
| 36 | PT_EI long int testandset (int *spinlock); |
| 37 | PT_EI long int testandset (int *spinlock) |
| 38 | { |
| 39 | register unsigned int ret; |
| 40 | |
| 41 | #if defined(__thumb__) |
| 42 | void *pc; |
| 43 | __asm__ __volatile__( |
| 44 | ".align 0\n" |
| 45 | "\tbx pc\n" |
| 46 | "\tnop\n" |
| 47 | "\t.arm\n" |
| 48 | "\tswp %0, %2, [%3]\n" |
| 49 | "\torr %1, pc, #1\n" |
| 50 | "\tbx %1\n" |
| 51 | "\t.force_thumb" |
| 52 | : "=r"(ret), "=r"(pc) |
| 53 | : "0"(1), "r"(spinlock)); |
| 54 | #else |
| 55 | __asm__ __volatile__("swp %0, %1, [%2]" |
| 56 | : "=r"(ret) |
| 57 | : "0"(1), "r"(spinlock)); |
| 58 | #endif |
| 59 | |
| 60 | return ret; |
| 61 | } |
| 62 | |
| 63 | |
| 64 | /* Get some notion of the current stack. Need not be exactly the top |
| 65 | of the stack, just something somewhere in the current frame. */ |
| 66 | #define CURRENT_STACK_FRAME stack_pointer |
| 67 | register char * stack_pointer __asm__ ("sp"); |
| 68 | |
| 69 | #endif /* pt-machine.h */ |