1/* $OpenBSD: debug_i386.S,v 1.13 2022/12/08 01:25:45 guenther Exp $ */ 2 3/* 4 * Copyright (c) 1997 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 18 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 * 28 */ 29 30#include <machine/asm.h> 31#include <machine/psl.h> 32#define _LOCORE 33#include <machine/segments.h> 34#include <machine/trap.h> 35#include <debug_md.h> 36#undef _LOCORE 37 38 /* do this way because some cpus (like cyrix 6x86) store garbage 39 * into high word, instead of zeroes. 40 */ 41#define pushsr(sr) movl sr, %eax; pushl %eax 42 43 .text 44 .globl alltraps 45 46alltraps: 47 pushal 48 pushsr(%ds) 49 pushsr(%es) 50 pushsr(%fs) 51 pushsr(%gs) 52 /* muck %cs, see note about pushsr() above */ 53 movl 0xf*4(%esp), %eax 54 movzwl %ax, %eax 55 movl %eax, 0xf*4(%esp) 56#ifdef DEBUG_DEBUG 57 movl $0xb8280, %edi 58 movl 0x0c*4(%esp), %eax /* trapno */ 59 addb $'0', %al 60 movb $0x17, %ah 61 shll $16, %eax 62 movb 0x0d*4(%esp), %al /* error */ 63 addb $'0', %al 64 movb $0x17, %ah 65 movl %eax, (%edi) 66#endif 67 call check_regs 68#ifdef DEBUG_DEBUG 69 movl $0xb8290, %edi 70 movl $0x47394738, (%edi) 71#endif 72 popl %gs 73 popl %fs 74 popl %es 75 popl %ds 76 popal 77 addl $0x8, %esp 78 hlt 79 iret 80 81ENTRY(check_regs) 82#ifdef DEBUG_DEBUG 83 movl $0xb8284, %edi 84 movl $0x47334732, (%edi) 85#endif 86 movl $0x10, %eax 87 mov %ax, %ds 88 mov %ax, %es 89 movl $reg, %edi 90 cld 91 movl 0x0c*4(%esp), %eax; stosl /* %eax */ 92 movl 0x0b*4(%esp), %eax; stosl /* %ecx */ 93 movl 0x0a*4(%esp), %eax; stosl /* %edx */ 94 movl 0x09*4(%esp), %eax; stosl /* %ebx */ 95 movl 0x08*4(%esp), %eax; stosl /* %esp */ 96 movl 0x07*4(%esp), %eax; stosl /* %ebp */ 97 movl 0x06*4(%esp), %eax; stosl /* %esi */ 98 movl 0x05*4(%esp), %eax; stosl /* %edi */ 99 movl 0x0f*4(%esp), %eax; stosl /* %eip */ 100 movl 0x11*4(%esp), %eax; stosl /* %eflags */ 101 movl 0x10*4(%esp), %eax; stosl /* %cs */ 102 mov %ss, %ax ; stosl /* %ss */ 103 movl 0x04*4(%esp), %eax; stosl /* %ds */ 104 movl 0x03*4(%esp), %eax; stosl /* %es */ 105 movl 0x02*4(%esp), %eax; stosl /* %fs */ 106 movl 0x01*4(%esp), %eax; stosl /* %gs */ 107 108#ifdef DEBUG_DEBUG 109 movl $0xb8288, %edi 110 movl $0x47354734, (%edi) 111#endif 112 movl 0x0e*4(%esp), %ecx /* error */ 113 movl 0x0d*4(%esp), %eax /* trapno */ 114 pushl %ecx 115 pushl %eax 116 call dump_regs 117 popl %eax 118 popl %eax 119 120#ifdef DEBUG_DEBUG 121 movl $0xb828c, %edi 122 movl $0x47374736, (%edi) 123#endif 124 ret 125