aboutsummaryrefslogtreecommitdiffstats
path: root/contrib/libs/cxxsupp/builtins/i386/chkstk.S
blob: f0bea21874575e06ce369e61479efcf61f2495dd (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception

#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__