derek.holloway
7502bf64a4
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41 lines
1009 B
ArmAsm
41 lines
1009 B
ArmAsm
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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#include "../assembly.h"
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// _chkstk routine
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// This routine is windows specific
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// http://msdn.microsoft.com/en-us/library/ms648426.aspx
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// Notes from r227519
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// MSVC x64s __chkstk and cygmings ___chkstk_ms do not adjust %rsp
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// themselves. It also does not clobber %rax so we can reuse it when
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// adjusting %rsp.
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#ifdef __x86_64__
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.text
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.balign 4
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DEFINE_COMPILERRT_FUNCTION(___chkstk_ms)
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push %rcx
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push %rax
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cmp $0x1000,%rax
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lea 24(%rsp),%rcx
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jb 1f
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2:
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sub $0x1000,%rcx
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test %rcx,(%rcx)
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sub $0x1000,%rax
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cmp $0x1000,%rax
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ja 2b
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1:
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sub %rax,%rcx
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test %rcx,(%rcx)
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pop %rax
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pop %rcx
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ret
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END_COMPILERRT_FUNCTION(___chkstk_ms)
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#endif // __x86_64__
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