1/* $OpenBSD: tfork_thread.S,v 1.8 2022/12/24 10:47:22 kettenis 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 18#include "SYS.h" 19 20/* 21 * r0 r1 r2 r3 22 * __tfork_thread(param, psize, start_fnc, start_arg); 23 */ 24 25ENTRY(__tfork_thread) 26 .cfi_startproc 27 RETGUARD_SETUP(__tfork_thread, x15) 28 SYSTRAP(__tfork) 29 .cfi_endproc 30 bcs CERROR 31 32 /* check if we are parent or child */ 33 cbz x0, 1f 34 RETGUARD_CHECK(__tfork_thread, x15) 35 ret 36 371: 38 .cfi_startproc 39 .cfi_undefined lr 40 /* child */ 41 mov fp, #0 42 mov x0, x3 43 blr x2 44 SYSTRAP(__threxit) 45 udf #0 46 .cfi_endproc 47END(__tfork_thread) 48