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
36
37
38
39
40
41
42
43
44
45
46
47
48
49
|
/* Copyright 2022-2024 Free Software Foundation, Inc.
This file is part of GDB.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>. */
.text
.globl main
.type main,#function
main:
.cfi_startproc
stp x29, x30, [sp, -16]!
.cfi_def_cfa sp, 16
.cfi_offset x29, 0
.cfi_offset x30, 8
bl test_func
ldp x29, x30, [sp], 16
.cfi_restore x29
.cfi_restore x30
.cfi_def_cfa sp, 0
mov x0, 0
ret
.cfi_endproc
.globl test_func
test_func:
.cfi_startproc
// Unwind x30 to a different value
// CFA_val_expression x30 const2u 0x1234
.cfi_escape 0x16, 30, 0x03, 0x0a, 0x34, 0x12
// CFA_val_expression pc breg30 0
.cfi_escape 0x16, 32, 0x02, 0x8e, 0x00
mov x0, x30
.cfi_register 32, x0
mov x30, 0x1234
ret x0
.cfi_endproc
.section .note.GNU-stack,"",@progbits
|