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
|
/* Copyright (C) 2001-2022 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 <errno.h>
#include <sysdep.h>
#include <pointer_guard.h>
#include <setjmp.h>
#include <bits/setjmp.h>
#include <stdlib.h>
#include <unistd.h>
#include <stap-probe.h>
/* See sysdeps/unix/sysv/linux/s390/s390-64/pointer_guard.h. */
#if IS_IN (rtld)
# undef PTR_DEMANGLE
#endif
/* Jump to the position specified by ENV, causing the
setjmp call there to return VAL, or 1 if VAL is 0. */
void
__longjmp (__jmp_buf env, int val)
{
#ifdef PTR_DEMANGLE
uintptr_t guard = THREAD_GET_POINTER_GUARD ();
# ifdef CHECK_SP
CHECK_SP (env, guard);
# endif
#elif defined CHECK_SP
CHECK_SP (env, 0);
#endif
register long int r2 __asm__ ("%r2") = val == 0 ? 1 : val;
#ifdef PTR_DEMANGLE
register uintptr_t r3 __asm__ ("%r3") = guard;
register void *r1 __asm__ ("%r1") = (void *) env;
#endif
/* Restore registers and jump back. */
__asm__ __volatile__ (
/* longjmp probe expects longjmp first argument, second
argument and target address. */
#ifdef PTR_DEMANGLE
"lmg %%r4,%%r5,64(%1)\n\t"
"xgr %%r4,%2\n\t"
"xgr %%r5,%2\n\t"
LIBC_PROBE_ASM (longjmp, 8@%1 -4@%0 8@%%r4)
#else
LIBC_PROBE_ASM (longjmp, 8@%1 -4@%0 8@%%r14)
#endif
/* restore fpregs */
"ld %%f8,80(%1)\n\t"
"ld %%f9,88(%1)\n\t"
"ld %%f10,96(%1)\n\t"
"ld %%f11,104(%1)\n\t"
"ld %%f12,112(%1)\n\t"
"ld %%f13,120(%1)\n\t"
"ld %%f14,128(%1)\n\t"
"ld %%f15,136(%1)\n\t"
/* restore gregs and return to jmp_buf target */
#ifdef PTR_DEMANGLE
"lmg %%r6,%%r13,0(%1)\n\t"
"lgr %%r15,%%r5\n\t"
LIBC_PROBE_ASM (longjmp_target, 8@%1 -4@%0 8@%%r4)
"br %%r4"
#else
"lmg %%r6,%%r15,0(%1)\n\t"
LIBC_PROBE_ASM (longjmp_target, 8@%1 -4@%0 8@%%r14)
"br %%r14"
#endif
: : "r" (r2),
#ifdef PTR_DEMANGLE
"r" (r1), "r" (r3)
#else
"a" (env)
#endif
);
/* Avoid `volatile function does return' warnings. */
for (;;);
}
|
