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/* Test if an executable can read from the TLS from an STT_GNU_IFUNC resolver.
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 <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#include <inttypes.h>
#include <libc-symbols.h>
__thread int bar;
extern __thread int bar_gd asm ("bar") __attribute__ ((tls_model("global-dynamic")));
static int *bar_ptr = NULL;
static uint32_t resolver_platform = 0;
int foo (void);
int tcb_test (void);
/* Offsets copied from tcb-offsets.h. */
#ifdef __powerpc64__
# define __TPREG "r13"
# define __ATPLATOFF -28764
#else
# define __TPREG "r2"
# define __ATPLATOFF -28724
#endif
uint32_t
get_platform (void)
{
register unsigned long tp __asm__ (__TPREG);
uint32_t tmp;
__asm__ ("lwz %0,%1(%2)\n"
: "=r" (tmp)
: "n" (__ATPLATOFF), "b" (tp));
return tmp;
}
void
init_foo (void)
{
bar_ptr = &bar_gd;
}
int
my_foo (void)
{
printf ("&bar = %p and bar_ptr = %p.\n", &bar, bar_ptr);
return bar_ptr != NULL;
}
__ifunc (foo, foo, my_foo, void, init_foo);
void
init_tcb_test (void)
{
resolver_platform = get_platform ();
}
int
my_tcb_test (void)
{
printf ("resolver_platform = 0x%"PRIx32
" and current platform = 0x%"PRIx32".\n",
resolver_platform, get_platform ());
return resolver_platform != 0;
}
__ifunc (tcb_test, tcb_test, my_tcb_test, void, init_tcb_test);
static int
do_test (void)
{
int ret = 0;
if (foo ())
printf ("PASS: foo IFUNC resolver called once.\n");
else
{
printf ("FAIL: foo IFUNC resolver not called once.\n");
ret = 1;
}
if (&bar == bar_ptr)
printf ("PASS: bar address read from IFUNC resolver is correct.\n");
#if !defined TST_TLSIFUNC_STATIC || !defined PIC \
|| defined HIDDEN_VAR_NEEDS_DYNAMIC_RELOC
else
{
printf ("FAIL: bar address read from IFUNC resolver is incorrect.\n");
ret = 1;
}
#endif
if (tcb_test ())
printf ("PASS: tcb_test IFUNC resolver called once.\n");
else
{
printf ("FAIL: tcb_test IFUNC resolver not called once.\n");
ret = 1;
}
if (resolver_platform == get_platform ())
printf ("PASS: platform read from IFUNC resolver is correct.\n");
else
{
printf ("FAIL: platform read from IFUNC resolver is incorrect.\n");
ret = 1;
}
return ret;
}
#include <support/test-driver.c>
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