1/* $NetBSD: sigreturn.s,v 1.6 2001/11/26 21:10:32 fredette Exp $ */ 2 3/* 4 * Copyright (c) 1988 University of Utah. 5 * Copyright (c) 1980, 1990, 1993 6 * The Regents of the University of California. All rights reserved. 7 * 8 * This code is derived from software contributed to Berkeley by 9 * the Systems Programming Group of the University of Utah Computer 10 * Science Department. 11 * 12 * Redistribution and use in source and binary forms, with or without 13 * modification, are permitted provided that the following conditions 14 * are met: 15 * 1. Redistributions of source code must retain the above copyright 16 * notice, this list of conditions and the following disclaimer. 17 * 2. Redistributions in binary form must reproduce the above copyright 18 * notice, this list of conditions and the following disclaimer in the 19 * documentation and/or other materials provided with the distribution. 20 * 3. All advertising materials mentioning features or use of this software 21 * must display the following acknowledgement: 22 * This product includes software developed by the University of 23 * California, Berkeley and its contributors. 24 * 4. Neither the name of the University nor the names of its contributors 25 * may be used to endorse or promote products derived from this software 26 * without specific prior written permission. 27 * 28 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 29 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 30 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 31 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 32 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 33 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 34 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 35 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 36 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 37 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 38 * SUCH DAMAGE. 39 * 40 * from: Utah $Hdr: locore.s 1.66 92/12/22$ 41 * 42 * @(#)locore.s 8.6 (Berkeley) 5/27/94 43 */ 44 45/* 46 * NOTICE: This is not a standalone file. To use it, #include it in 47 * your port's locore.s, like so: 48 * 49 * #include <m68k/m68k/sigreturn.s> 50 */ 51 52/* 53 * The sigreturn() syscall comes here. It requires special handling 54 * because we must open a hole in the stack to fill in the (possibly much 55 * larger) original stack frame. 56 */ 57ENTRY_NOPROFILE(m68k_sigreturn_stub) 58 lea %sp@(-84),%sp | leave enough space for largest frame 59 movl %sp@(84),%sp@ | move up current 8 byte frame 60 movl %sp@(88),%sp@(4) 61 movl #84,%sp@- | default: adjust by 84 bytes 62 moveml #0xFFFF,%sp@- | save user registers 63 movl %usp,%a0 | save the user SP 64 movl %a0,%sp@(FR_SP) | in the savearea 65 movl #SYS___sigreturn14,%sp@- | push syscall number 66 jbsr _C_LABEL(syscall) | handle it 67 addql #4,%sp | pop syscall# 68 movl %sp@(FR_SP),%a0 | grab and restore 69 movl %a0,%usp | user SP 70 lea %sp@(FR_HW),%a1 | pointer to HW frame 71 movw %sp@(FR_ADJ),%d0 | do we need to adjust the stack? 72 jeq Lsigr1 | no, just continue 73 moveq #92,%d1 | total size 74 subw %d0,%d1 | - hole size = frame size 75 lea %a1@(92),%a0 | destination 76 addw %d1,%a1 | source 77 lsrw #1,%d1 | convert to word count 78 subqw #1,%d1 | minus 1 for dbf 79Lsigrlp: 80 movw %a1@-,%a0@- | copy a word 81 dbf %d1,Lsigrlp | continue 82 movl %a0,%a1 | new HW frame base 83Lsigr1: 84 movl %a1,%sp@(FR_SP) | new SP value 85 moveml %sp@+,#0x7FFF | restore user registers 86 movl %sp@,%sp | and our SP 87 jra _ASM_LABEL(rei) | all done 88 89#if defined(COMPAT_13) || defined(COMPAT_SUNOS) 90/* 91 * Pull in the NetBSD 1.3 sigreturn stub. 92 */ 93#include <m68k/m68k/compat_13_sigreturn13.s> 94#endif 95