1/* $OpenBSD: tfork_thread.S,v 1.1 2012/03/22 00:44:55 guenther Exp $ */ 2/* 3 * Copyright (c) 2005 Dale Rahn <drahn@openbsd.org> 4 * 5 * Permission to use, copy, modify, and distribute this software for any 6 * purpose with or without fee is hereby granted, provided that the above 7 * copyright notice and this permission notice appear in all copies. 8 * 9 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES 10 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 11 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR 12 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 13 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 14 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF 15 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 16 */ 17#include <sys/syscall.h> 18#include <machine/asm.h> 19#include "SYS.h" 20 21/* 22 * r0 r1 r2 r3 23 * __tfork_thread(param, stack_addr, start_fnc, start_arg); 24 */ 25 26ENTRY(__tfork_thread) 27 stmdb sp!, {r4} 28 mov r4, r1 29 30 31 SYSTRAP(__tfork) 32 bcs 1f 33 34 /* check if we are parent or child */ 35 cmp r0, #0 36 ldmneia sp!, {r4} 37 movne pc, lr 38 39 /* child */ 40 mov sp, r4 41 mov r0, r3 42 mov lr, pc 43 mov pc, r2 44 nop 45 SYSTRAP(__threxit) 461: 47 ldmia sp!, {r4} 48 b PIC_SYM(CERROR, PLT) 49