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/* This is file LONGJMP.S */
/*
** Copyright (C) 1993 DJ Delorie, 24 Kirsten Ave, Rochester NH 03867-2954
**
** This file is distributed under the terms listed in the document
** "copying.dj", available from DJ Delorie at the address above.
** A copy of "copying.dj" should accompany this file; if not, a copy
** should be available from where this file was obtained.  This file
** may not be distributed without a verbatim copy of "copying.dj".
**
** This file is distributed WITHOUT ANY WARRANTY; without even the implied
** warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
*/

/*
**      jmp_buf:
**       eax ebx ecx edx esi edi ebp esp eip es fs gs ss
**       0   4   8   12  16  20  24  28  32  36 38 40 42
*/

        .globl  _longjmp /* jmp_buf, int */
_longjmp:
        pushl   %ebp
        movl    %esp,%ebp

        movl    8(%ebp),%edi    /* get jmp_buf */
        movl    12(%ebp),%eax   /* store retval in j->eax */
        testl   %eax,%eax
        jne 0f
        incl %eax
0:
        movl    %eax,0(%edi)

        movl    24(%edi),%ebp

        pushfl                  /* get flags so will only re-enable */
        popl    %ebx            /* interrupts if they were previously */
                                /* enabled */

        cli
        movw    42(%edi),%ax
        movw    %ax,%ss
        movl    28(%edi),%esp
        
        pushl   32(%edi)        /* for a ret! */

        pushl   %ebx            /* save flags that contain previous */
                                /* interrupt state */

        movw    36(%edi),%ax
        movw    %ax,%es
        movw    38(%edi),%ax
        movw    %ax,%fs
        movw    40(%edi),%ax
        movw    %ax,%gs
        movl    0(%edi),%eax
        movl    4(%edi),%ebx
        movl    8(%edi),%ecx
        movl    12(%edi),%edx
        movl    16(%edi),%esi
        movl    20(%edi),%edi

        popfl                   /* restore previous interrupt state */

        ret                     /* actually jump to new eip */