/*      $OpenBSD: debug_i386.S,v 1.13 2022/12/08 01:25:45 guenther Exp $        */

/*
 * Copyright (c) 1997 Michael Shalayeff
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 */

#include <machine/asm.h>
#include <machine/psl.h>
#define _LOCORE
#include <machine/segments.h>
#include <machine/trap.h>
#include <debug_md.h>
#undef _LOCORE

        /* do this way because some cpus (like cyrix 6x86) store garbage
         * into high word, instead of zeroes.
         */
#define pushsr(sr)      movl sr, %eax; pushl %eax

        .text
        .globl  alltraps

alltraps:
        pushal
        pushsr(%ds)
        pushsr(%es)
        pushsr(%fs)
        pushsr(%gs)
                /* muck %cs, see note about pushsr() above */
        movl    0xf*4(%esp), %eax
        movzwl  %ax, %eax
        movl    %eax, 0xf*4(%esp)
#ifdef DEBUG_DEBUG
        movl    $0xb8280, %edi
        movl    0x0c*4(%esp), %eax      /* trapno */
        addb    $'0', %al
        movb    $0x17, %ah
        shll    $16, %eax
        movb    0x0d*4(%esp), %al       /* error */
        addb    $'0', %al
        movb    $0x17, %ah
        movl    %eax, (%edi)
#endif
        call    check_regs
#ifdef DEBUG_DEBUG
        movl    $0xb8290, %edi
        movl    $0x47394738, (%edi)
#endif
        popl    %gs
        popl    %fs
        popl    %es
        popl    %ds
        popal
        addl    $0x8, %esp
        hlt
        iret

ENTRY(check_regs)
#ifdef DEBUG_DEBUG
        movl    $0xb8284, %edi
        movl    $0x47334732, (%edi)
#endif
        movl    $0x10, %eax
        mov     %ax, %ds
        mov     %ax, %es
        movl    $reg, %edi
        cld
        movl    0x0c*4(%esp), %eax; stosl /* %eax       */
        movl    0x0b*4(%esp), %eax; stosl /* %ecx       */
        movl    0x0a*4(%esp), %eax; stosl /* %edx       */
        movl    0x09*4(%esp), %eax; stosl /* %ebx       */
        movl    0x08*4(%esp), %eax; stosl /* %esp       */
        movl    0x07*4(%esp), %eax; stosl /* %ebp       */
        movl    0x06*4(%esp), %eax; stosl /* %esi       */
        movl    0x05*4(%esp), %eax; stosl /* %edi       */
        movl    0x0f*4(%esp), %eax; stosl /* %eip       */
        movl    0x11*4(%esp), %eax; stosl /* %eflags    */
        movl    0x10*4(%esp), %eax; stosl /* %cs        */
        mov             %ss,  %ax ; stosl /* %ss        */
        movl    0x04*4(%esp), %eax; stosl /* %ds        */
        movl    0x03*4(%esp), %eax; stosl /* %es        */
        movl    0x02*4(%esp), %eax; stosl /* %fs        */
        movl    0x01*4(%esp), %eax; stosl /* %gs        */

#ifdef DEBUG_DEBUG
        movl    $0xb8288, %edi
        movl    $0x47354734, (%edi)
#endif
        movl    0x0e*4(%esp), %ecx      /* error */
        movl    0x0d*4(%esp), %eax      /* trapno */
        pushl   %ecx
        pushl   %eax
        call    dump_regs
        popl    %eax
        popl    %eax

#ifdef DEBUG_DEBUG
        movl    $0xb828c, %edi
        movl    $0x47374736, (%edi)
#endif
        ret