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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
#include "../assembly.h"
// __chkstk routine
// This routine is windows specific.
// http://msdn.microsoft.com/en-us/library/ms648426.aspx
// This clobbers registers x16 and x17.
// Does not modify any memory or the stack pointer.
// mov x15, #256 // Number of bytes of stack, in units of 16 byte
// bl __chkstk
// sub sp, sp, x15, lsl #4
#ifdef __aarch64__
#define PAGE_SIZE 4096
.p2align 2
DEFINE_COMPILERRT_FUNCTION(__chkstk)
lsl x16, x15, #4
mov x17, sp
1:
sub x17, x17, #PAGE_SIZE
subs x16, x16, #PAGE_SIZE
ldr xzr, [x17]
b.gt 1b
ret
END_COMPILERRT_FUNCTION(__chkstk)
#endif // __aarch64__
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