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
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
|
/* Copyright (C) 1997-2025 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public License as
published by the Free Software Foundation; either version 2.1 of the
License, or (at your option) any later version.
The GNU C Library 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library. If not, see
<https://www.gnu.org/licenses/>. */
#include <sysdep.h>
#include <pointer_guard.h>
#include <jmpbuf-offsets.h>
#include <stap-probe.h>
/* Keep traditional entry points in with sigsetjmp(). */
ENTRY (setjmp)
mov x1, #1
b 1f
END (setjmp)
ENTRY_ALIGN (_setjmp, 2)
mov x1, #0
b 1f
END (_setjmp)
libc_hidden_def (_setjmp)
ENTRY_ALIGN (__sigsetjmp, 2)
1:
#if IS_IN(libc)
/* Disable ZA state of SME in libc.a and libc.so, but not in ld.so.
The calling convention of __libc_arm_za_disable allows to do
this thus allowing to avoid saving to and reading from stack.
As a result we also don't need to sign the return address and
check it after returning because it is not stored to stack. */
mov x13, x30
cfi_register (x30, x13)
bl __libc_arm_za_disable
mov x30, x13
cfi_register (x13, x30)
#endif
stp x19, x20, [x0, #JB_X19<<3]
stp x21, x22, [x0, #JB_X21<<3]
stp x23, x24, [x0, #JB_X23<<3]
stp x25, x26, [x0, #JB_X25<<3]
stp x27, x28, [x0, #JB_X27<<3]
#ifdef PTR_MANGLE
PTR_MANGLE (x4, x30, x3)
stp x29, x4, [x0, #JB_X29<<3]
#else
stp x29, x30, [x0, #JB_X29<<3]
#endif
/* setjmp probe takes 3 arguments, address of jump buffer
first argument (8@x0), return value second argument (-4@x1),
and target address (8@x30), respectively. */
LIBC_PROBE (setjmp, 3, 8@x0, -4@x1, 8@x30)
stp d8, d9, [x0, #JB_D8<<3]
stp d10, d11, [x0, #JB_D10<<3]
stp d12, d13, [x0, #JB_D12<<3]
stp d14, d15, [x0, #JB_D14<<3]
/* GCS support. */
mov x16, 1
CHKFEAT_X16
tbnz x16, 0, L(gcs_done)
MRS_GCSPR (x2)
add x2, x2, 8 /* GCS state right after setjmp returns. */
str x2, [x0, #JB_GCSPR]
L(gcs_done):
mov x2, sp
#ifdef PTR_MANGLE
PTR_MANGLE (x2, x2, x3)
#endif
str x2, [x0, #JB_SP<<3]
#if IS_IN (rtld)
/* In ld.so we never save the signal mask */
mov w0, #0
ret
#else
b C_SYMBOL_NAME(__sigjmp_save)
#endif
END (__sigsetjmp)
hidden_def (__sigsetjmp)
|