1/* $OpenBSD: tfork_thread.S,v 1.2 2012/06/21 00:56:59 guenther Exp $ */ 2 3/* 4 * Copyright (c) 2005, Miodrag Vallat 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 16 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 17 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 18 * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, 19 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES 20 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR 21 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 23 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN 24 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 25 * POSSIBILITY OF SUCH DAMAGE. 26 */ 27 28#include "SYS.h" 29 30/* 31 * int __tfork_thread(const struct __tfork *param, size_t psize, void (*func)(void *), void *arg); 32 */ 33FRAMESZ=4*REGSZ 34GPOFF=FRAMESZ-2*REGSZ 35LEAF(__tfork_thread, FRAMESZ) 36 /* a0 = param, a1 = psize, a2 = func, a3 = arg */ 37 PTR_SUBU sp, FRAMESZ 38 SETUP_GP64(GPOFF, _C_LABEL(__tfork_thread)) 39 .set reorder 40 41 move t1, a3 /* arg */ 42 43 __DO_SYSCALL(__tfork) 44 bnez a3, 9f 45 46 beqz v0, 1f 47 48 RESTORE_GP64 49 PTR_ADDU sp, FRAMESZ 50 51 /* 52 * In parent process: just return. 53 */ 54 j ra 55 561: 57 /* 58 * In child process: invoke function, then exit. 59 */ 60 61 move t9, a2 /* func */ 62 move a0, t1 /* arg */ 63 move v0, zero 64 jal ra, t9 65 66 move a0, zero 67 __DO_SYSCALL(__threxit) 68 699: 70 /* 71 * System call failure. 72 */ 73 LA t9, CERROR 74 75 RESTORE_GP64 76 PTR_ADDU sp, FRAMESZ 77 jr t9 78END(__tfork_thread) 79