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2b778ceb | 1 | /* Copyright (C) 2001-2021 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 | |
ffeac417 | 11 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
41bdb6e2 | 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> | |
20 | #include <setjmp.h> | |
21 | #include <bits/setjmp.h> | |
22 | #include <stdlib.h> | |
23 | #include <unistd.h> | |
53244a4e | 24 | #include <stap-probe.h> |
847b055c AJ |
25 | |
26 | /* Jump to the position specified by ENV, causing the | |
27 | setjmp call there to return VAL, or 1 if VAL is 0. */ | |
2f438e20 | 28 | void |
847b055c AJ |
29 | __longjmp (__jmp_buf env, int val) |
30 | { | |
00c2b3b9 | 31 | #ifdef PTR_DEMANGLE |
7291c56f | 32 | uintptr_t guard = THREAD_GET_POINTER_GUARD (); |
b8bb339f | 33 | # ifdef CHECK_SP |
7291c56f | 34 | CHECK_SP (env, guard); |
b8bb339f UD |
35 | # endif |
36 | #elif defined CHECK_SP | |
37 | CHECK_SP (env, 0); | |
7291c56f | 38 | #endif |
31cf3942 | 39 | register long int r2 __asm__ ("%r2") = val == 0 ? 1 : val; |
7291c56f | 40 | #ifdef PTR_DEMANGLE |
31cf3942 SL |
41 | register uintptr_t r3 __asm__ ("%r3") = guard; |
42 | register void *r1 __asm__ ("%r1") = (void *) env; | |
00c2b3b9 UD |
43 | #endif |
44 | /* Restore registers and jump back. */ | |
31cf3942 SL |
45 | __asm__ __volatile__ ( |
46 | /* longjmp probe expects longjmp first argument, second | |
47 | argument and target address. */ | |
53244a4e | 48 | #ifdef PTR_DEMANGLE |
31cf3942 SL |
49 | "lmg %%r4,%%r5,64(%1)\n\t" |
50 | "xgr %%r4,%2\n\t" | |
51 | "xgr %%r5,%2\n\t" | |
52 | LIBC_PROBE_ASM (longjmp, 8@%1 -4@%0 8@%%r4) | |
53244a4e | 53 | #else |
31cf3942 | 54 | LIBC_PROBE_ASM (longjmp, 8@%1 -4@%0 8@%%r14) |
53244a4e SL |
55 | #endif |
56 | ||
31cf3942 SL |
57 | /* restore fpregs */ |
58 | "ld %%f8,80(%1)\n\t" | |
59 | "ld %%f9,88(%1)\n\t" | |
60 | "ld %%f10,96(%1)\n\t" | |
61 | "ld %%f11,104(%1)\n\t" | |
62 | "ld %%f12,112(%1)\n\t" | |
63 | "ld %%f13,120(%1)\n\t" | |
64 | "ld %%f14,128(%1)\n\t" | |
65 | "ld %%f15,136(%1)\n\t" | |
53244a4e | 66 | |
31cf3942 | 67 | /* restore gregs and return to jmp_buf target */ |
00c2b3b9 | 68 | #ifdef PTR_DEMANGLE |
31cf3942 SL |
69 | "lmg %%r6,%%r13,0(%1)\n\t" |
70 | "lgr %%r15,%%r5\n\t" | |
71 | LIBC_PROBE_ASM (longjmp_target, 8@%1 -4@%0 8@%%r4) | |
72 | "br %%r4" | |
305bb37e | 73 | #else |
31cf3942 SL |
74 | "lmg %%r6,%%r15,0(%1)\n\t" |
75 | LIBC_PROBE_ASM (longjmp_target, 8@%1 -4@%0 8@%%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 | } |