| // 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 |
| |
| // Notes from r227519 |
| // MSVC x64s __chkstk and cygmings ___chkstk_ms do not adjust %rsp |
| // themselves. It also does not clobber %rax so we can reuse it when |
| // adjusting %rsp. |
| |
| #ifdef __x86_64__ |
| |
| .text |
| .balign 4 |
| DEFINE_COMPILERRT_FUNCTION(___chkstk_ms) |
| push %rcx |
| push %rax |
| cmp $0x1000,%rax |
| lea 24(%rsp),%rcx |
| jb 1f |
| 2: |
| sub $0x1000,%rcx |
| test %rcx,(%rcx) |
| sub $0x1000,%rax |
| cmp $0x1000,%rax |
| ja 2b |
| 1: |
| sub %rax,%rcx |
| test %rcx,(%rcx) |
| pop %rax |
| pop %rcx |
| ret |
| END_COMPILERRT_FUNCTION(___chkstk_ms) |
| |
| #endif // __x86_64__ |
