1/* $NetBSD: compat_13_sigreturn13.s,v 1.8 2024/01/17 12:19:06 thorpej 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. Neither the name of the University nor the names of its contributors 21 * may be used to endorse or promote products derived from this software 22 * without specific prior written permission. 23 * 24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 34 * SUCH DAMAGE. 35 * 36 * from: Utah $Hdr: locore.s 1.66 92/12/22$ 37 * 38 * @(#)locore.s 8.6 (Berkeley) 5/27/94 39 */ 40 41#include <machine/asm.h> 42 43#include "assym.h" 44 45 .file "compat_13_sigreturn13.s" 46 .text 47 48/* 49 * The compat_13_sigreturn13() syscall comes here. It requires special 50 * handling because we must open a hole in the stack to fill in the 51 * (possibly much larger) original stack frame. 52 */ 53ENTRY_NOPROFILE(m68k_compat_13_sigreturn13_stub) 54 lea -84(%sp),%sp | leave enough space for largest frame 55 movl 84(%sp),(%sp) | move up current 8 byte frame 56 movl 88(%sp),4(%sp) 57 movl #84,-(%sp) | default: adjust by 84 bytes 58 moveml #0xFFFF,-(%sp) | save user registers 59 movl %usp,%a0 | save the user SP 60 movl %a0,FR_SP(%sp) | in the savearea 61 movl #SYS_compat_13_sigreturn13,-(%sp) | push syscall number 62 jbsr _C_LABEL(syscall) | handle it 63 addql #4,%sp | pop syscall# 64 movl FR_SP(%sp),%a0 | grab and restore 65 movl %a0,%usp | user SP 66 lea FR_HW(%sp),%a1 | pointer to HW frame 67 movw FR_ADJ(%sp),%d0 | do we need to adjust the stack? 68 jeq 2f | no, just continue 69 moveq #92,%d1 | total size 70 subw %d0,%d1 | - hole size = frame size 71 lea 92(%a1),%a0 | destination 72 addw %d1,%a1 | source 73 lsrw #1,%d1 | convert to word count 74 subqw #1,%d1 | minus 1 for dbf 751: 76 movw -(%a1),-(%a0) | copy a word 77 dbf %d1,1b | continue 78 movl %a0,%a1 | new HW frame base 792: 80 movl %a1,FR_SP(%sp) | new SP value 81 moveml (%sp)+,#0x7FFF | restore user registers 82 movl (%sp),%sp | and our SP 83 jra _ASM_LABEL(rei) | all done 84