derek.holloway
7502bf64a4
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41 lines
1014 B
ArmAsm
41 lines
1014 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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//
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// This function does not decrement %esp at the end.
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// GCC after 4.6 generates calls to "___chkstk_ms". For other variants of
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// this function, which do decrement %esp, see chkstk2.S.
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#ifdef __i386__
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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 %ecx
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push %eax
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cmp $0x1000,%eax
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lea 12(%esp),%ecx
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jb 1f
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2:
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sub $0x1000,%ecx
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test %ecx,(%ecx)
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sub $0x1000,%eax
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cmp $0x1000,%eax
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ja 2b
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1:
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sub %eax,%ecx
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test %ecx,(%ecx)
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pop %eax
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pop %ecx
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ret
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END_COMPILERRT_FUNCTION(__chkstk_ms)
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#endif // __i386__
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