| 1 | /* Test setjmp interoperability with static dlopen BZ #21895. |
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| 2 | Copyright (C) 2017-2024 Free Software Foundation, Inc. |
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| 3 | This file is part of the GNU C Library. |
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| 4 | |
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| 5 | The GNU C Library is free software; you can redistribute it and/or |
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| 6 | modify it under the terms of the GNU Lesser General Public |
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| 7 | License as published by the Free Software Foundation; either |
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| 8 | version 2.1 of the License, or (at your option) any later version. |
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| 9 | |
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| 10 | The GNU C Library is distributed in the hope that it will be useful, |
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| 11 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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| 13 | Lesser General Public License for more details. |
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| 14 | |
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| 15 | You should have received a copy of the GNU Lesser General Public |
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| 16 | License along with the GNU C Library; if not, see |
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| 17 | <https://www.gnu.org/licenses/>. */ |
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| 18 | |
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| 19 | #include <setjmp.h> |
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| 20 | #include <stdio.h> |
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| 21 | #include <stdlib.h> |
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| 22 | #include <dlfcn.h> |
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| 23 | |
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| 24 | /* Set TOC area pointed by sp to zero. */ |
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| 25 | #define SET_TOC_TO_ZERO(sp) \ |
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| 26 | ({ \ |
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| 27 | unsigned int zero = 0; \ |
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| 28 | asm volatile ("std %0, 24(%1)\n\t" :: "r" (zero), "r" (sp)); \ |
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| 29 | }) |
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| 30 | |
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| 31 | static void |
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| 32 | bar (jmp_buf jb, unsigned long sp) |
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| 33 | { |
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| 34 | static int i; |
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| 35 | if (i++==1) |
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| 36 | exit(0); /* Success. */ |
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| 37 | |
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| 38 | /* This will set TOC are on caller frame (foo) to zero. __longjmp |
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| 39 | must restore r2 otherwise a segmentation fault will happens after |
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| 40 | it jumps back to foo. */ |
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| 41 | SET_TOC_TO_ZERO(sp); |
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| 42 | longjmp(jb, i); |
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| 43 | } |
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| 44 | |
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| 45 | static int |
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| 46 | do_test (void) |
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| 47 | { |
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| 48 | void *h = dlopen(file: "setjmp-bug21895.so" , RTLD_NOW); |
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| 49 | if (!h) |
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| 50 | { |
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| 51 | puts(s: dlerror()); |
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| 52 | return 1; |
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| 53 | } |
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| 54 | |
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| 55 | void (*pfoo)(void) = dlsym(handle: h, name: "foo" ); |
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| 56 | if (!pfoo) |
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| 57 | { |
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| 58 | puts(s: dlerror()); |
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| 59 | return 1; |
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| 60 | } |
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| 61 | |
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| 62 | void (**ppbar)(jmp_buf, unsigned long) = dlsym(handle: h, name: "bar" ); |
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| 63 | if (!ppbar) |
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| 64 | { |
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| 65 | puts(s: dlerror()); |
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| 66 | return 1; |
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| 67 | } |
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| 68 | |
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| 69 | *ppbar = bar; |
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| 70 | pfoo(); |
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| 71 | |
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| 72 | for(;;); |
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| 73 | } |
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| 74 | |
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| 75 | #include <support/test-driver.c> |
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| 76 | |
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