1/* $OpenBSD: tfork_thread.S,v 1.4 2020/10/19 14:15:29 deraadt Exp $ */ 2 3/* 4 * Copyright (c) 2005 Tim Wiess <tim@nop.cx> 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 and this permission notice appear in all copies. 9 * 10 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES 11 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 12 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR 13 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 14 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 15 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF 16 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 17 */ 18 19#include "SYS.h" 20 21ENTRY(__tfork_thread) 22 RETGUARD_SETUP(__tfork_thread, %r11) 23 24 li %r0, SYS___tfork 25 sc 26 cmpwi %r0, 0 27 bne 1f 28 29 /* check if we are parent or child */ 30 cmpwi %r3, 0 31 bnelr 32 33 /* child */ 34 mr %r12, %r5 35 mtlr %r5 /* fp */ 36 mr %r3, %r6 /* arg */ 37 subi %r1, %r1, 32 /* fixup sp to get headroom */ 38 blrl 39 40 /* child returned, call __threxit */ 41 li %r0, SYS___threxit 42 sc 43 .long 0 /* illegal */ 441: 45 stw %r0, R13_OFFSET_ERRNO(%r13) 46 li %r3, -1 47 RETGUARD_CHECK(__tfork_thread, %r11) 48 blr 49END(__tfork_thread) 50