| /* |
| * Copyright (C) 2008 The Android Open Source Project |
| * All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * * Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * * Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in |
| * the documentation and/or other materials provided with the |
| * distribution. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS |
| * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE |
| * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, |
| * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, |
| * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS |
| * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED |
| * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, |
| * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT |
| * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| * SUCH DAMAGE. |
| */ |
| #include <sys/linux-syscalls.h> |
| #include <machine/asm.h> |
| #include <machine/cpu-features.h> |
| |
| #define FUTEX_WAIT 0 |
| #define FUTEX_WAKE 1 |
| |
| /* __futex_wait(*ftx, val, *timespec) */ |
| /* __futex_wake(*ftx, counter) */ |
| /* __futex_syscall3(*ftx, op, val) */ |
| /* __futex_syscall4(*ftx, op, val, *timespec) */ |
| |
| .global __futex_wait |
| .type __futex_wait, %function |
| |
| .global __futex_wake |
| .type __futex_wake, %function |
| |
| .global __futex_syscall3 |
| .type __futex_syscall3, %function |
| |
| .global __futex_syscall4 |
| .type __futex_syscall4, %function |
| |
| #if __ARM_EABI__ |
| |
| ENTRY(__futex_syscall3) |
| stmdb sp!, {r4, r7} |
| .save {r4, r7} |
| ldr r7, =__NR_futex |
| swi #0 |
| ldmia sp!, {r4, r7} |
| bx lr |
| END(__futex_syscall3) |
| |
| ENTRY(__futex_wait) |
| stmdb sp!, {r4, r7} |
| .save {r4, r7} |
| mov r3, r2 |
| mov r2, r1 |
| mov r1, #FUTEX_WAIT |
| ldr r7, =__NR_futex |
| swi #0 |
| ldmia sp!, {r4, r7} |
| bx lr |
| END(__futex_wait) |
| |
| ENTRY(__futex_wake) |
| .save {r4, r7} |
| stmdb sp!, {r4, r7} |
| mov r2, r1 |
| mov r1, #FUTEX_WAKE |
| ldr r7, =__NR_futex |
| swi #0 |
| ldmia sp!, {r4, r7} |
| bx lr |
| END(__futex_wake) |
| |
| #else |
| |
| ENTRY(__futex_syscall3) |
| swi #__NR_futex |
| bx lr |
| END(__futex_syscall3) |
| |
| ENTRY(__futex_wait) |
| mov r3, r2 |
| mov r2, r1 |
| mov r1, #FUTEX_WAIT |
| swi #__NR_futex |
| bx lr |
| END(__futex_wait) |
| |
| ENTRY(__futex_wake) |
| mov r2, r1 |
| mov r1, #FUTEX_WAKE |
| swi #__NR_futex |
| bx lr |
| END(__futex_wake) |
| |
| #endif |
| |
| ENTRY(__futex_syscall4) |
| b __futex_syscall3 |
| END(__futex_syscall4) |