1/* $NetBSD: sigcode.S,v 1.1 1999/11/17 14:56:11 kleink Exp $ */ 2 3/*- 4 * Copyright (C) 1995, 1996 Wolfgang Solfrank. 5 * Copyright (C) 1995, 1996 TooLs GmbH. 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. All advertising materials mentioning features or use of this software 17 * must display the following acknowledgement: 18 * This product includes software developed by TooLs GmbH. 19 * 4. The name of TooLs GmbH may not be used to endorse or promote products 20 * derived from this software without specific prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY TOOLS GMBH ``AS IS'' AND ANY EXPRESS OR 23 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 24 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 25 * IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 26 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 27 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; 28 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 29 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR 30 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF 31 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 32 */ 33 34#include <machine/asm.h> 35#include <sys/syscall.h> 36#include "assym.inc" 37 38/* 39 * The following code gets copied to the top of the user stack on process 40 * execution. It does signal trampolining on signal delivery. 41 * 42 * On entry r1 points to a struct sigframe at bottom of current stack. 43 * All other registers are unchanged. 44 * 45 * Entered midway through for v2 ELF binaries that don't need to deal with 46 * function descriptors. 47 * 48 */ 49 .globl CNAME(sigcode64),CNAME(szsigcode64) 50 .globl CNAME(sigcode64_elfv2),CNAME(szsigcode64_elfv2) 51CNAME(sigcode64): 52 mflr 2 /* resolve function descriptor */ 53 ld 0,0(2) 54 ld 2,8(2) 55 mtlr 0 56 57CNAME(sigcode64_elfv2): 58 addi 1,1,-112 /* reserved space for callee */ 59 mflr 12 /* ELFv2 wants the address in r12 */ 60 blrl 61 62 addi 3,1,112+SF_UC /* restore sp, and get &frame->sf_uc */ 63 li 0,SYS_sigreturn 64 sc /* sigreturn(scp) */ 65 /* 66 * If we get back to here, it means sigreturn failed. 67 * As such, we are now stuck in the wrong context. 68 * Exit immediately without touching the stack. 69 */ 70 li 0,SYS_exit 71 sc /* exit(errno) */ 72endsigcode64: 73 74 .data 75CNAME(szsigcode64): 76 .long endsigcode64 - CNAME(sigcode64) 77CNAME(szsigcode64_elfv2): 78 .long endsigcode64 - CNAME(sigcode64_elfv2) 79 80