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/* Test setjmp interoperability with static dlopen BZ #21895.
Copyright (C) 2017-2025 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */
#include <setjmp.h>
#include <stdio.h>
#include <stdlib.h>
#include <dlfcn.h>
/* Set TOC area pointed by sp to zero. */
#define SET_TOC_TO_ZERO(sp) \
({ \
unsigned int zero = 0; \
asm volatile ("std %0, 24(%1)\n\t" :: "r" (zero), "r" (sp)); \
})
static void
bar (jmp_buf jb, unsigned long sp)
{
static int i;
if (i++==1)
exit(0); /* Success. */
/* This will set TOC are on caller frame (foo) to zero. __longjmp
must restore r2 otherwise a segmentation fault will happens after
it jumps back to foo. */
SET_TOC_TO_ZERO(sp);
longjmp(jb, i);
}
static int
do_test (void)
{
void *h = dlopen("setjmp-bug21895.so", RTLD_NOW);
if (!h)
{
puts(dlerror());
return 1;
}
void (*pfoo)(void) = dlsym(h, "foo");
if (!pfoo)
{
puts(dlerror());
return 1;
}
void (**ppbar)(jmp_buf, unsigned long) = dlsym(h, "bar");
if (!ppbar)
{
puts(dlerror());
return 1;
}
*ppbar = bar;
pfoo();
for(;;);
}
#include <support/test-driver.c>
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