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098a657fe4
PI_STATIC_AND_HIDDEN indicates whether accesses to internal linkage variables and hidden visibility variables in a shared object (ld.so) need dynamic relocations (usually R_*_RELATIVE). PI (position independent) in the macro name is a misnomer: a code sequence using GOT is typically position-independent as well, but using dynamic relocations does not meet the requirement. Not defining PI_STATIC_AND_HIDDEN is legacy and we expect that all new ports will define PI_STATIC_AND_HIDDEN. Current ports defining PI_STATIC_AND_HIDDEN are more than the opposite. Change the configure default. No functional change. Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
133 lines
3.0 KiB
C
133 lines
3.0 KiB
C
/* Test if an executable can read from the TLS from an STT_GNU_IFUNC resolver.
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Copyright (C) 2017-2022 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#include <stdio.h>
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#include <stdlib.h>
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#include <stdint.h>
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#include <inttypes.h>
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#include <libc-symbols.h>
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__thread int bar;
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extern __thread int bar_gd asm ("bar") __attribute__ ((tls_model("global-dynamic")));
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static int *bar_ptr = NULL;
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static uint32_t resolver_platform = 0;
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int foo (void);
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int tcb_test (void);
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/* Offsets copied from tcb-offsets.h. */
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#ifdef __powerpc64__
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# define __TPREG "r13"
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# define __ATPLATOFF -28764
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#else
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# define __TPREG "r2"
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# define __ATPLATOFF -28724
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#endif
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uint32_t
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get_platform (void)
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{
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register unsigned long tp __asm__ (__TPREG);
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uint32_t tmp;
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__asm__ ("lwz %0,%1(%2)\n"
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: "=r" (tmp)
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: "n" (__ATPLATOFF), "b" (tp));
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return tmp;
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}
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void
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init_foo (void)
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{
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bar_ptr = &bar_gd;
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}
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int
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my_foo (void)
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{
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printf ("&bar = %p and bar_ptr = %p.\n", &bar, bar_ptr);
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return bar_ptr != NULL;
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}
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__ifunc (foo, foo, my_foo, void, init_foo);
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void
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init_tcb_test (void)
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{
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resolver_platform = get_platform ();
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}
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int
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my_tcb_test (void)
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{
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printf ("resolver_platform = 0x%"PRIx32
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" and current platform = 0x%"PRIx32".\n",
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resolver_platform, get_platform ());
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return resolver_platform != 0;
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}
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__ifunc (tcb_test, tcb_test, my_tcb_test, void, init_tcb_test);
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static int
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do_test (void)
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{
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int ret = 0;
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if (foo ())
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printf ("PASS: foo IFUNC resolver called once.\n");
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else
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{
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printf ("FAIL: foo IFUNC resolver not called once.\n");
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ret = 1;
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}
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if (&bar == bar_ptr)
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printf ("PASS: bar address read from IFUNC resolver is correct.\n");
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#if !defined TST_TLSIFUNC_STATIC || !defined PIC \
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|| defined HIDDEN_VAR_NEEDS_DYNAMIC_RELOC
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else
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{
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printf ("FAIL: bar address read from IFUNC resolver is incorrect.\n");
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ret = 1;
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}
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#endif
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if (tcb_test ())
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printf ("PASS: tcb_test IFUNC resolver called once.\n");
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else
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{
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printf ("FAIL: tcb_test IFUNC resolver not called once.\n");
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ret = 1;
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}
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if (resolver_platform == get_platform ())
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printf ("PASS: platform read from IFUNC resolver is correct.\n");
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else
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{
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printf ("FAIL: platform read from IFUNC resolver is incorrect.\n");
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ret = 1;
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}
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return ret;
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}
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#include <support/test-driver.c>
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