1 | /* Copyright (C) 2000-2024 Free Software Foundation, Inc. |
2 | This file is part of the GNU C Library. |
3 | |
4 | The GNU C Library is free software; you can redistribute it and/or |
5 | modify it under the terms of the GNU Lesser General Public |
6 | License as published by the Free Software Foundation; either |
7 | version 2.1 of the License, or (at your option) any later version. |
8 | |
9 | The GNU C Library is distributed in the hope that it will be useful, |
10 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
11 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
12 | Lesser General Public License for more details. |
13 | |
14 | You should have received a copy of the GNU Lesser General Public |
15 | License along with the GNU C Library; if not, see |
16 | <https://www.gnu.org/licenses/>. */ |
17 | |
18 | #include <errno.h> |
19 | #include <sysdep.h> |
20 | #include <pointer_guard.h> |
21 | #include <setjmp.h> |
22 | #include <bits/setjmp.h> |
23 | #include <stdlib.h> |
24 | #include <unistd.h> |
25 | #include <stap-probe.h> |
26 | |
27 | /* See sysdeps/unix/sysv/linux/s390/s390-32/pointer_guard.h. */ |
28 | #if IS_IN (rtld) |
29 | # undef PTR_DEMANGLE |
30 | #endif |
31 | |
32 | /* Jump to the position specified by ENV, causing the |
33 | setjmp call there to return VAL, or 1 if VAL is 0. */ |
34 | void |
35 | __longjmp (__jmp_buf env, int val) |
36 | { |
37 | #ifdef PTR_DEMANGLE |
38 | uintptr_t guard = THREAD_GET_POINTER_GUARD (); |
39 | # ifdef CHECK_SP |
40 | CHECK_SP (env, guard); |
41 | # endif |
42 | #elif defined CHECK_SP |
43 | CHECK_SP (env, 0); |
44 | #endif |
45 | register int r2 __asm__ ("%r2" ) = val == 0 ? 1 : val; |
46 | #ifdef PTR_DEMANGLE |
47 | register uintptr_t r3 __asm__ ("%r3" ) = guard; |
48 | register void *r1 __asm__ ("%r1" ) = (void *) env; |
49 | #endif |
50 | /* Restore registers and jump back. */ |
51 | __asm__ __volatile__ ( |
52 | /* longjmp probe expects longjmp first argument, second |
53 | argument and target address. */ |
54 | #ifdef PTR_DEMANGLE |
55 | "lm %%r4,%%r5,32(%1)\n\t" |
56 | "xr %%r4,%2\n\t" |
57 | "xr %%r5,%2\n\t" |
58 | LIBC_PROBE_ASM (longjmp, 4@%1 -4@%0 4@%%r4) |
59 | #else |
60 | LIBC_PROBE_ASM (longjmp, 4@%1 -4@%0 4@%%r14) |
61 | #endif |
62 | |
63 | /* restore fpregs */ |
64 | "ld %%f6,48(%1)\n\t" |
65 | "ld %%f4,40(%1)\n\t" |
66 | |
67 | /* restore gregs and return to jmp_buf target */ |
68 | #ifdef PTR_DEMANGLE |
69 | "lm %%r6,%%r13,0(%1)\n\t" |
70 | "lr %%r15,%%r5\n\t" |
71 | LIBC_PROBE_ASM (longjmp_target, 4@%1 -4@%0 4@%%r4) |
72 | "br %%r4" |
73 | #else |
74 | "lm %%r6,%%r15,0(%1)\n\t" |
75 | LIBC_PROBE_ASM (longjmp_target, 4@%1 -4@%0 4@%%r14) |
76 | "br %%r14" |
77 | #endif |
78 | : : "r" (r2), |
79 | #ifdef PTR_DEMANGLE |
80 | "r" (r1), "r" (r3) |
81 | #else |
82 | "a" (env) |
83 | #endif |
84 | ); |
85 | |
86 | /* Avoid `volatile function does return' warnings. */ |
87 | for (;;); |
88 | } |
89 | |