chkstk.S

// This file is dual licensed under the MIT and the University of Illinois Open
// Source Licenses. See LICENSE.TXT for details.

#include "../assembly.h"

// _chkstk routine
// This routine is windows specific
// http://msdn.microsoft.com/en-us/library/ms648426.aspx

#ifdef __i386__

.text
.balign 4
DEFINE_COMPILERRT_FUNCTION(__chkstk_ms)
        push   %ecx
        push   %eax
        cmp    $0x1000,%eax
        lea    12(%esp),%ecx
        jb     1f
2:
        sub    $0x1000,%ecx
        test   %ecx,(%ecx)
        sub    $0x1000,%eax
        cmp    $0x1000,%eax
        ja     2b
1:
        sub    %eax,%ecx
        test   %ecx,(%ecx)
        pop    %eax
        pop    %ecx
        ret
END_COMPILERRT_FUNCTION(__chkstk_ms)

#endif // __i386__