derek.holloway
7502bf64a4
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42 lines
1.1 KiB
ArmAsm
42 lines
1.1 KiB
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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// This clobbers registers x16 and x17.
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// Does not modify any memory or the stack pointer.
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// mov x15, #256 // Number of bytes of stack, in units of 16 byte
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// bl __chkstk
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// sub sp, sp, x15, lsl #4
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#if defined(__aarch64__) || defined(__arm64ec__)
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#ifdef __arm64ec__
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#define CHKSTK_FUNC __chkstk_arm64ec
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#else
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#define CHKSTK_FUNC __chkstk
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#endif
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#define PAGE_SIZE 4096
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.p2align 2
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DEFINE_COMPILERRT_FUNCTION(CHKSTK_FUNC)
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lsl x16, x15, #4
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mov x17, sp
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1:
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sub x17, x17, #PAGE_SIZE
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subs x16, x16, #PAGE_SIZE
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ldr xzr, [x17]
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b.gt 1b
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ret
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END_COMPILERRT_FUNCTION(CHKSTK_FUNC)
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#endif // defined(__aarch64__) || defined(__arm64ec__)
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