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