| // 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 |
| |
| #if defined(__aarch64__) || defined(__arm64ec__) |
| |
| #ifdef __arm64ec__ |
| #define CHKSTK_FUNC __chkstk_arm64ec |
| #else |
| #define CHKSTK_FUNC __chkstk |
| #endif |
| |
| #define PAGE_SIZE 4096 |
| |
| .p2align 2 |
| DEFINE_COMPILERRT_FUNCTION(CHKSTK_FUNC) |
| 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_FUNC) |
| |
| #endif // defined(__aarch64__) || defined(__arm64ec__) |
