57b08b0944
to reflect the new license. These used slightly different spellings that defeated my regular expressions. We understand that people may be surprised that we're moving the header entirely to discuss the new license. We checked this carefully with the Foundation's lawyer and we believe this is the correct approach. Essentially, all code in the project is now made available by the LLVM project under our new license, so you will see that the license headers include that license only. Some of our contributors have contributed code under our old license, and accordingly, we have retained a copy of our old license notice in the top-level files in each project and repository. llvm-svn: 351648
36 lines
1.0 KiB
ArmAsm
36 lines
1.0 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 the register r12, and the condition codes, and uses r5 and r6
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// as temporaries by backing them up and restoring them afterwards.
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// Does not modify any memory or the stack pointer.
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// movw r4, #256 // Number of bytes of stack, in units of 4 byte
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// bl __chkstk
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// sub.w sp, sp, r4
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#define PAGE_SIZE 4096
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.p2align 2
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DEFINE_COMPILERRT_FUNCTION(__chkstk)
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lsl r4, r4, #2
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mov r12, sp
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push {r5, r6}
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mov r5, r4
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1:
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sub r12, r12, #PAGE_SIZE
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subs r5, r5, #PAGE_SIZE
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ldr r6, [r12]
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bgt 1b
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pop {r5, r6}
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bx lr
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END_COMPILERRT_FUNCTION(__chkstk)
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