1/* $OpenBSD: tfork_thread.S,v 1.1 2012/03/22 00:44:56 guenther Exp $ */ 2 3/* 4 * Copyright (c) 2007 Miodrag Vallat. 5 * 6 * Permission to use, copy, modify, and distribute this software for any 7 * purpose with or without fee is hereby granted, provided that the above 8 * copyright notice, this permission notice, and the disclaimer below 9 * appear in all copies. 10 * 11 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES 12 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 13 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR 14 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 15 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 16 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF 17 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 18 */ 19 20#include "SYS.h" 21 22/* 23 * int __tfork_thread(const struct __tfork *param, void *stack, void (*func)(void *), void *arg); 24 * r4 r5 r6 r7 25 */ 26ENTRY(__tfork_thread) 27 mov.l .LSYS___tfork, r0 28 .word 0xc380 /* trapa #0x80 */ 29 bf 9f 30 31 tst r0, r0 32 bt 1f 33 34 /* 35 * In parent process: just return. 36 */ 37 rts 38 nop 39 401: 41 /* 42 * In child process: switch stack, invoke function, then exit. 43 */ 44 mov r5, sp 45 jsr @r6 46 mov r7, r4 47 48 mov.l .LSYS___threxit, r0 49 .word 0xc380 /* trapa #0x80 */ 50 519: 52 /* 53 * System call failure. 54 */ 55 JUMP_CERROR 56 57 .align 2 58.LSYS___tfork: .long SYS___tfork 59.LSYS___threxit: .long SYS___threxit 60 61 SET_ENTRY_SIZE(__tfork_thread) 62