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6d7e8eda | 1 | /* Copyright (C) 2000-2023 Free Software Foundation, Inc. |
847b055c | 2 | This file is part of the GNU C Library. |
847b055c AJ |
3 | |
4 | The GNU C Library is free software; you can redistribute it and/or | |
41bdb6e2 AJ |
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. | |
847b055c AJ |
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 | |
41bdb6e2 AJ |
11 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
12 | Lesser General Public License for more details. | |
847b055c | 13 | |
41bdb6e2 | 14 | You should have received a copy of the GNU Lesser General Public |
59ba27a6 | 15 | License along with the GNU C Library; if not, see |
5a82c748 | 16 | <https://www.gnu.org/licenses/>. */ |
847b055c AJ |
17 | |
18 | #include <errno.h> | |
19 | #include <sysdep.h> | |
88f4b692 | 20 | #include <pointer_guard.h> |
847b055c AJ |
21 | #include <setjmp.h> |
22 | #include <bits/setjmp.h> | |
23 | #include <stdlib.h> | |
24 | #include <unistd.h> | |
53244a4e | 25 | #include <stap-probe.h> |
847b055c | 26 | |
58548b9d FW |
27 | /* See sysdeps/unix/sysv/linux/s390/s390-32/pointer_guard.h. */ |
28 | #if IS_IN (rtld) | |
29 | # undef PTR_DEMANGLE | |
30 | #endif | |
31 | ||
847b055c AJ |
32 | /* Jump to the position specified by ENV, causing the |
33 | setjmp call there to return VAL, or 1 if VAL is 0. */ | |
2f438e20 | 34 | void |
847b055c AJ |
35 | __longjmp (__jmp_buf env, int val) |
36 | { | |
00c2b3b9 | 37 | #ifdef PTR_DEMANGLE |
7291c56f | 38 | uintptr_t guard = THREAD_GET_POINTER_GUARD (); |
b8bb339f | 39 | # ifdef CHECK_SP |
7291c56f | 40 | CHECK_SP (env, guard); |
b8bb339f UD |
41 | # endif |
42 | #elif defined CHECK_SP | |
43 | CHECK_SP (env, 0); | |
7291c56f | 44 | #endif |
31cf3942 | 45 | register int r2 __asm__ ("%r2") = val == 0 ? 1 : val; |
7291c56f | 46 | #ifdef PTR_DEMANGLE |
31cf3942 SL |
47 | register uintptr_t r3 __asm__ ("%r3") = guard; |
48 | register void *r1 __asm__ ("%r1") = (void *) env; | |
00c2b3b9 UD |
49 | #endif |
50 | /* Restore registers and jump back. */ | |
31cf3942 | 51 | __asm__ __volatile__ ( |
53244a4e SL |
52 | /* longjmp probe expects longjmp first argument, second |
53 | argument and target address. */ | |
00c2b3b9 | 54 | #ifdef PTR_DEMANGLE |
31cf3942 SL |
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) | |
53244a4e | 59 | #else |
31cf3942 | 60 | LIBC_PROBE_ASM (longjmp, 4@%1 -4@%0 4@%%r14) |
53244a4e SL |
61 | #endif |
62 | ||
31cf3942 SL |
63 | /* restore fpregs */ |
64 | "ld %%f6,48(%1)\n\t" | |
65 | "ld %%f4,40(%1)\n\t" | |
53244a4e | 66 | |
31cf3942 | 67 | /* restore gregs and return to jmp_buf target */ |
53244a4e | 68 | #ifdef PTR_DEMANGLE |
31cf3942 SL |
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" | |
305bb37e | 73 | #else |
31cf3942 SL |
74 | "lm %%r6,%%r15,0(%1)\n\t" |
75 | LIBC_PROBE_ASM (longjmp_target, 4@%1 -4@%0 4@%%r14) | |
76 | "br %%r14" | |
305bb37e | 77 | #endif |
31cf3942 | 78 | : : "r" (r2), |
00c2b3b9 | 79 | #ifdef PTR_DEMANGLE |
31cf3942 | 80 | "r" (r1), "r" (r3) |
305bb37e | 81 | #else |
31cf3942 | 82 | "a" (env) |
00c2b3b9 | 83 | #endif |
31cf3942 | 84 | ); |
847b055c AJ |
85 | |
86 | /* Avoid `volatile function does return' warnings. */ | |
87 | for (;;); | |
88 | } |