diff options
Diffstat (limited to 'newlib/libc/sys/go32/longjmp.S')
| -rw-r--r-- | newlib/libc/sys/go32/longjmp.S | 65 |
1 files changed, 65 insertions, 0 deletions
diff --git a/newlib/libc/sys/go32/longjmp.S b/newlib/libc/sys/go32/longjmp.S new file mode 100644 index 000000000..3c9dca33b --- /dev/null +++ b/newlib/libc/sys/go32/longjmp.S @@ -0,0 +1,65 @@ +/* This is file LONGJMP.S */ +/* +** Copyright (C) 1993 DJ Delorie +** +** This file is distributed under the terms listed in the document +** "copying.dj". +** 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 */ |