File: chkstk.S

package info (click to toggle)
llvm-toolchain-14 1%3A14.0.6-12
  • links: PTS, VCS
  • area: main
  • in suites: bookworm
  • size: 1,496,180 kB
  • sloc: cpp: 5,593,972; ansic: 986,872; asm: 585,869; python: 184,223; objc: 72,530; lisp: 31,119; f90: 27,793; javascript: 9,780; pascal: 9,762; sh: 9,482; perl: 7,468; ml: 5,432; awk: 3,523; makefile: 2,538; xml: 953; cs: 573; fortran: 567
file content (35 lines) | stat: -rw-r--r-- 913 bytes parent folder | download | duplicates (24) 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
 
// 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__