sysdeps/powerpc/powerpc64/tst-setjmp-bug21895-static.c

   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>