1/* $NetBSD: sigcode.S,v 1.10 2021/10/28 11:11:11 christos Exp $ */ 2 3/* $OpenBSD: locore.S,v 1.46 2001/09/20 18:33:03 mickey Exp $ */ 4 5/* 6 * Copyright (c) 1998-2004 Michael Shalayeff 7 * All rights reserved. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 19 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 20 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 21 * IN NO EVENT SHALL THE AUTHOR OR HIS RELATIVES BE LIABLE FOR ANY DIRECT, 22 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES 23 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR 24 * SERVICES; LOSS OF MIND, USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 25 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 26 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING 27 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF 28 * THE POSSIBILITY OF SUCH DAMAGE. 29 * 30 * Portitions of this file are derived from other sources, see 31 * the copyrights and acknowledgements below. 32 */ 33/* 34 * Copyright (c) 1990,1991,1992,1994 The University of Utah and 35 * the Computer Systems Laboratory (CSL). All rights reserved. 36 * 37 * THE UNIVERSITY OF UTAH AND CSL PROVIDE THIS SOFTWARE IN ITS "AS IS" 38 * CONDITION, AND DISCLAIM ANY LIABILITY OF ANY KIND FOR ANY DAMAGES 39 * WHATSOEVER RESULTING FROM ITS USE. 40 * 41 * CSL requests users of this software to return to csl-dist@cs.utah.edu any 42 * improvements that they make and grant CSL redistribution rights. 43 * 44 * Utah $Hdr: locore.s 1.62 94/12/15$ 45 */ 46/* 47 * (c) Copyright 1988 HEWLETT-PACKARD COMPANY 48 * 49 * To anyone who acknowledges that this file is provided "AS IS" 50 * without any express or implied warranty: 51 * permission to use, copy, modify, and distribute this file 52 * for any purpose is hereby granted without fee, provided that 53 * the above copyright notice and this notice appears in all 54 * copies, and that the name of Hewlett-Packard Company not be 55 * used in advertising or publicity pertaining to distribution 56 * of the software without specific, written prior permission. 57 * Hewlett-Packard Company makes no representations about the 58 * suitability of this software for any purpose. 59 */ 60 61/* 62 * NOTICE: This is not a standalone file. To use it, #include it in 63 * your port's locore.S, like so: 64 * 65 * #include <hppa/hppa/sigcode.S> 66 */ 67 68/* 69 * Signal "trampoline" code. Invoked from RTE setup by sendsig(). 70 */ 71ENTRY_NOPROFILE(sigcode,0) 72 .call 73 /* 74 * Our sendsig() places the address of the signal handler 75 * in %arg3. It may actually be a PLABEL. 76 */ 77 bb,>=,n %arg3, 30, L$sigcode_bounce ; branch if not a PLABEL 78 depi 0, 31, 2, %arg3 ; zero L bit in PLABEL pointer 79 ldw 4(%arg3), %r19 ; load shared library linkage 80 ldw 0(%arg3), %arg3 ; load real catcher address 81L$sigcode_bounce: 82 /* 83 * This blr puts the address of the following nop in rp. 84 * It also schedules the nop for execution, which is why 85 * that instruction has to be a nop, or, rather, not any 86 * instruction only meant to execute once the signal handler 87 * returns. 88 */ 89 blr %r0, %rp 90 /* 91 * This bv schedules the instruction pointed to by arg3 92 * for execution. So, arg3 is the address of the signal 93 * handler. 94 */ 95 bv,n %r0(%arg3) 96 nop 97 /* 98 * The signal handler has returned. Since %r3 is on the list 99 * of callee-saved registers, it's whatever the sendsig 100 * code wanted it set to. Since we copy it into arg0, 101 * it looks like sendsig leaves %r3 holding the desired 102 * single argument to sys___sigreturn14, i.e., the 103 * struct sigcontext *. 104 */ 105 /* Make a SYS___sigreturn14 system call. */ 106 copy %r3, %arg0 107 ldil L%SYSCALLGATE, %r1 108 .call 109 ble 4(%sr7, %r1) 110 ldi SYS_compat_16___sigreturn14, %t1 111 /* Make a SYS_exit system call. */ 112 copy %ret0, %arg0 113 ldil L%SYSCALLGATE, %r1 114 .call 115 ble 4(%sr7, %r1) 116 ldi SYS_exit, %t1 117ALTENTRY(esigcode) 118EXIT(sigcode) 119