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elf: Limit tst-prelink-cmp target archs

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elf/tst-prelink-cmp was initially added for x86 (commit fe534fe898) to validate
the fix for Bug 19178, and later applied to all architectures that use GLOB_DAT
relocations (commit 89569c8bb6).  However, that bug only affected targets that
handle GLOB_DAT relocations as ELF_TYPE_CLASS_EXTERN_PROTECTED_DATA, so the test
should only apply to targets defining DL_EXTERN_PROTECTED_DATA, which gates the
usage of the elf type class above.  For all other targets not meeting that
criteria, the test now returns with UNSUPPORTED status.

Fixes the test on POWER10 processors, which started using R_PPC64_GLOB_DAT.

Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
This commit is contained in:
Matheus Castanho 2020-12-15 15:35:41 -03:00
parent 7d88c6142c
commit 01cdcf783a
3 changed files with 51 additions and 8 deletions
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9
elf/Makefile
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@ -457,12 +457,10 @@ update-all-abi: update-all-abi-ld
ifeq ($(have-glob-dat-reloc),yes)
tests += tst-prelink
tests-internal += tst-prelink-cmp
# Don't compile tst-prelink.c with PIE for GLOB_DAT relocation.
CFLAGS-tst-prelink.c += -fno-pie
tst-prelink-no-pie = yes
ifeq ($(run-built-tests),yes)
tests-special += $(objpfx)tst-prelink-cmp.out
endif
endif
# The test requires shared _and_ PIE because the executable
@ -1605,10 +1603,7 @@ tst-prelink-ENV = LD_TRACE_PRELINKING=1
$(objpfx)tst-prelink-conflict.out: $(objpfx)tst-prelink.out
grep stdout $< | grep conflict | $(AWK) '{ print $$10, $$11 }' > $@
$(objpfx)tst-prelink-cmp.out: tst-prelink.exp \
$(objpfx)tst-prelink-conflict.out
cmp $^ > $@; \
$(evaluate-test)
$(objpfx)tst-prelink-cmp.out: $(objpfx)tst-prelink-conflict.out
$(objpfx)tst-ldconfig-X.out : tst-ldconfig-X.sh $(objpfx)ldconfig
$(SHELL) $< '$(common-objpfx)' '$(test-wrapper-env)' \

49
elf/tst-prelink-cmp.c Normal file
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@ -0,0 +1,49 @@
/* Test the output from the environment variable, LD_TRACE_PRELINKING,
for prelink.
Copyright (C) 2021 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 <ldsodefs.h>
#include <support/check.h>
#include <support/xstdio.h>
#include <support/support.h>
#include <support/test-driver.h>
static int
do_test (void)
{
#ifndef DL_EXTERN_PROTECTED_DATA
return EXIT_UNSUPPORTED;
#else
char *src = xasprintf ("%s/elf/tst-prelink-conflict.out",
support_objdir_root);
FILE *f = xfopen (src,"r");
size_t buffer_length = 0;
char *buffer = NULL;
const char *expected = "/0 stdout\n";
xgetline (&buffer, &buffer_length, f);
TEST_COMPARE_STRING (expected, buffer);
free (buffer);
xfclose (f);
return 0;
#endif
}
#include <support/test-driver.c>

1
elf/tst-prelink.exp
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@ -1 +0,0 @@
/0 stdout