1  /* Test setjmp interoperability with static dlopen BZ #21895.
       2     Copyright (C) 2017-2023 Free Software Foundation, Inc.
       3     This file is part of the GNU C Library.
       4  
       5     The GNU C Library is free software; you can redistribute it and/or
       6     modify it under the terms of the GNU Lesser General Public
       7     License as published by the Free Software Foundation; either
       8     version 2.1 of the License, or (at your option) any later version.
       9  
      10     The GNU C Library is distributed in the hope that it will be useful,
      11     but WITHOUT ANY WARRANTY; without even the implied warranty of
      12     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
      13     Lesser General Public License for more details.
      14  
      15     You should have received a copy of the GNU Lesser General Public
      16     License along with the GNU C Library; if not, see
      17     <https://www.gnu.org/licenses/>.  */
      18  
      19  #include <setjmp.h>
      20  #include <stdio.h>
      21  #include <stdlib.h>
      22  #include <dlfcn.h>
      23  
      24  /* Set TOC area pointed by sp to zero.  */
      25  #define SET_TOC_TO_ZERO(sp)					 \
      26    ({								 \
      27      unsigned int zero = 0;					 \
      28      asm volatile ("std %0, 24(%1)\n\t" :: "r" (zero), "r" (sp)); \
      29    })
      30  
      31  static void
      32  bar (jmp_buf jb, unsigned long sp)
      33  {
      34    static int i;
      35    if (i++==1)
      36      exit(0);	/* Success.  */
      37  
      38    /* This will set TOC are on caller frame (foo) to zero. __longjmp
      39       must restore r2 otherwise a segmentation fault will happens after
      40       it jumps back to foo.  */
      41    SET_TOC_TO_ZERO(sp);
      42    longjmp(jb, i);
      43  }
      44  
      45  static int
      46  do_test (void)
      47  {
      48    void *h = dlopen("setjmp-bug21895.so", RTLD_NOW);
      49    if (!h)
      50      {
      51        puts(dlerror());
      52        return 1;
      53      }
      54  
      55    void (*pfoo)(void) = dlsym(h, "foo");
      56    if (!pfoo)
      57      {
      58        puts(dlerror());
      59        return 1;
      60      }
      61  
      62    void (**ppbar)(jmp_buf, unsigned long) = dlsym(h, "bar");
      63    if (!ppbar)
      64      {
      65        puts(dlerror());
      66        return 1;
      67      }
      68  
      69    *ppbar = bar;
      70    pfoo();
      71  
      72    for(;;);
      73  }
      74  
      75  #include <support/test-driver.c>