yuezonghe | 824eb0c | 2024-06-27 02:32:26 -0700 | [diff] [blame] | 1 | /* Machine-dependent pthreads configuration and inline functions. |
| 2 | SuperH version. |
| 3 | Copyright (C) 1999, 2000, 2001, 2002, 2003 Free Software Foundation, Inc. |
| 4 | This file is part of the GNU C Library. |
| 5 | Contributed by Niibe Yutaka <gniibe@m17n.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 __ASSEMBLER__ |
| 28 | #ifndef PT_EI |
| 29 | # define PT_EI __extern_always_inline |
| 30 | #endif |
| 31 | |
| 32 | extern long int testandset (int *spinlock); |
| 33 | |
| 34 | /* Spinlock implementation; required. */ |
| 35 | PT_EI long int |
| 36 | testandset (int *spinlock) |
| 37 | { |
| 38 | int ret; |
| 39 | |
| 40 | __asm__ __volatile__( |
| 41 | "tas.b @%1\n\t" |
| 42 | "movt %0" |
| 43 | : "=r" (ret) |
| 44 | : "r" (spinlock) |
| 45 | : "memory", "cc"); |
| 46 | |
| 47 | return (ret == 0); |
| 48 | } |
| 49 | |
| 50 | /* We want the OS to assign stack addresses. */ |
| 51 | #define FLOATING_STACKS 1 |
| 52 | |
| 53 | /* Maximum size of the stack if the rlimit is unlimited. */ |
| 54 | #define ARCH_STACK_MAX_SIZE 32*1024*1024 |
| 55 | |
| 56 | /* Get some notion of the current stack. Need not be exactly the top |
| 57 | of the stack, just something somewhere in the current frame. */ |
| 58 | #define CURRENT_STACK_FRAME stack_pointer |
| 59 | register char * stack_pointer __asm__ ("r15"); |
| 60 | |
| 61 | /* Return the thread descriptor for the current thread. */ |
| 62 | struct _pthread_descr_struct; |
| 63 | #define THREAD_SELF \ |
| 64 | ({ struct _pthread_descr_struct *self; \ |
| 65 | __asm__("stc gbr,%0" : "=r" (self)); self;}) |
| 66 | |
| 67 | /* Initialize the thread-unique value. */ |
| 68 | #define INIT_THREAD_SELF(descr, nr) \ |
| 69 | ({ __asm__ __volatile__("ldc %0,gbr" : : "r" (descr));}) |
| 70 | |
| 71 | /* Access to data in the thread descriptor is easy. */ |
| 72 | #define THREAD_GETMEM(descr, member) \ |
| 73 | ((void) sizeof (descr), THREAD_SELF->member) |
| 74 | #define THREAD_GETMEM_NC(descr, member) \ |
| 75 | ((void) sizeof (descr), THREAD_SELF->member) |
| 76 | #define THREAD_SETMEM(descr, member, value) \ |
| 77 | ((void) sizeof (descr), THREAD_SELF->member = (value)) |
| 78 | #define THREAD_SETMEM_NC(descr, member, value) \ |
| 79 | ((void) sizeof (descr), THREAD_SELF->member = (value)) |
| 80 | #endif /* __ASSEMBLER__ */ |
| 81 | |
| 82 | #endif /* pt-machine.h */ |