1/* $NetBSD: __sigtramp2.S,v 1.5 2014/03/06 19:02:58 skrll Exp $ */ 2 3/* 4 * Copyright (c) 1998-2001 Michael Shalayeff 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 17 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 18 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 19 * IN NO EVENT SHALL THE AUTHOR OR HIS RELATIVES BE LIABLE FOR ANY DIRECT, 20 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES 21 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR 22 * SERVICES; LOSS OF MIND, USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 24 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING 25 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF 26 * THE POSSIBILITY OF SUCH DAMAGE. 27 * 28 * Portitions of this file are derived from other sources, see 29 * the copyrights and acknowledgements below. 30 */ 31/* 32 * Copyright (c) 1990,1991,1992,1994 The University of Utah and 33 * the Computer Systems Laboratory (CSL). All rights reserved. 34 * 35 * THE UNIVERSITY OF UTAH AND CSL PROVIDE THIS SOFTWARE IN ITS "AS IS" 36 * CONDITION, AND DISCLAIM ANY LIABILITY OF ANY KIND FOR ANY DAMAGES 37 * WHATSOEVER RESULTING FROM ITS USE. 38 * 39 * CSL requests users of this software to return to csl-dist@cs.utah.edu any 40 * improvements that they make and grant CSL redistribution rights. 41 * 42 * Utah $Hdr: locore.s 1.62 94/12/15$ 43 */ 44/* 45 * (c) Copyright 1988 HEWLETT-PACKARD COMPANY 46 * 47 * To anyone who acknowledges that this file is provided "AS IS" 48 * without any express or implied warranty: 49 * permission to use, copy, modify, and distribute this file 50 * for any purpose is hereby granted without fee, provided that 51 * the above copyright notice and this notice appears in all 52 * copies, and that the name of Hewlett-Packard Company not be 53 * used in advertising or publicity pertaining to distribution 54 * of the software without specific, written prior permission. 55 * Hewlett-Packard Company makes no representations about the 56 * suitability of this software for any purpose. 57 */ 58 59#include "SYS.h" 60 61/* 62 * The hppa signal trampoline is required to call the handler 63 * possibily via a PLABEL. 64 * 65 * On entry, stack looks like: 66 * 67 * sp-> [x] 68 * r3,arg2-> ucontext structure 69 * arg1-> siginfo structure [0] 70 * 71 * where 72 * x = HPPA_FRAME_ROUND(sizeof(sigframe_siginfo)) 73 * 74 * and 75 * struct sigframe_siginfo { 76 * siginfo_t sf_si; 77 * ucontext_t sf_uc; 78 * }; 79 */ 80 81ENTRY_NOPROFILE(__sigtramp_siginfo_2, 0) 82 .call 83 84 /* 85 * Our sendsig() places the address of the signal handler in %arg3. 86 * It may actually be a PLABEL. 87 */ 88 bb,>=,n %arg3, 30, L$sigcode_bounce ; branch if not a PLABEL 89 depi 0, 31, 2, %arg3 ; zero L bit in PLABEL pointer 90 ldw 4(%arg3), %r19 ; load shared library linkage 91 ldw 0(%arg3), %arg3 ; load real catcher address 92 93L$sigcode_bounce: 94 95 /* 96 * This blr puts the address of the following nop in rp. 97 * It also schedules the nop for execution, which is why 98 * that instruction has to be a nop, or, rather, not any 99 * instruction only meant to execute once the signal handler 100 * returns. 101 */ 102 blr %r0, %rp 103 104 /* 105 * This bv schedules the instruction pointed to by arg3 106 * for execution. So, arg3 is the address of the signal 107 * handler. 108 */ 109 bv,n %r0(%arg3) 110 nop 111 112 /* 113 * The signal handler has returned. Since r3 is on the list 114 * of callee-saved registers, it's whatever the sendsig 115 * code wanted it set to. Since we copy it into arg0, 116 * it looks like sendsig leaves r3 holding the desired 117 * single argument to sys_setcontext, i.e., the ucontext_t *. 118 */ 119 120 /* Make a SYS_setcontext system call. */ 121 copy %r3, %arg0 122 ldil L%SYSCALLGATE, %r1 123 .call 124 ble 4(%sr2, %r1) 125 ldi SYS_setcontext, %t1 126 127 /* Make a SYS_exit system call. */ 128 copy %ret0, %arg0 129 ldil L%SYSCALLGATE, %r1 130 .call 131 ble 4(%sr2, %r1) 132 ldi SYS_exit, %t1 133EXIT(__sigtramp_siginfo_2) 134