| Pirama Arumuga Nainar | 799172d | 2016-03-03 15:50:30 -0800 | [diff] [blame^] | 1 | // This file is dual licensed under the MIT and the University of Illinois Open |
| 2 | // Source Licenses. See LICENSE.TXT for details. |
| 3 | |
| 4 | #include "../assembly.h" |
| 5 | |
| 6 | // _chkstk routine |
| 7 | // This routine is windows specific |
| 8 | // http://msdn.microsoft.com/en-us/library/ms648426.aspx |
| 9 | |
| 10 | // Notes from r227519 |
| 11 | // MSVC x64s __chkstk and cygmings ___chkstk_ms do not adjust %rsp |
| 12 | // themselves. It also does not clobber %rax so we can reuse it when |
| 13 | // adjusting %rsp. |
| 14 | |
| 15 | #ifdef __x86_64__ |
| 16 | |
| 17 | .text |
| 18 | .balign 4 |
| 19 | DEFINE_COMPILERRT_FUNCTION(___chkstk_ms) |
| 20 | push %rcx |
| 21 | push %rax |
| 22 | cmp $0x1000,%rax |
| 23 | lea 24(%rsp),%rcx |
| 24 | jb 1f |
| 25 | 2: |
| 26 | sub $0x1000,%rcx |
| 27 | test %rcx,(%rcx) |
| 28 | sub $0x1000,%rax |
| 29 | cmp $0x1000,%rax |
| 30 | ja 2b |
| 31 | 1: |
| 32 | sub %rax,%rcx |
| 33 | test %rcx,(%rcx) |
| 34 | pop %rax |
| 35 | pop %rcx |
| 36 | ret |
| 37 | END_COMPILERRT_FUNCTION(___chkstk_ms) |
| 38 | |
| 39 | #endif // __x86_64__ |