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92 lines
2.5 KiB
C
92 lines
2.5 KiB
C
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/* Test that lazy binding does not clobber r0.
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Copyright (C) 2018 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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<http://www.gnu.org/licenses/>. */
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#include <assert.h>
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#include <dlfcn.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#if defined (__s390x__)
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static const unsigned long magic_value = 0x0011223344556677UL;
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#else
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static const unsigned long magic_value = 0x00112233;
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#endif
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unsigned long r0x2_trampoline (unsigned long);
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/* Invoke r0x2, which doubles the value in r0. If we get
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value * 2 back, this means nothing clobbers r0, particularly,
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_dl_runtime_resolve and _dl_runtime_profile. */
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asm (" .type r0x2_trampoline, @function\n"
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"r0x2_trampoline:\n"
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#if defined (__s390x__)
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" lgr %r0,%r2\n"
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" stg %r14,112(%r15)\n"
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" aghi %r15,-160\n"
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" brasl %r14,r0x2@plt\n"
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" aghi %r15,160\n"
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" lg %r14,112(%r15)\n"
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" lgr %r2,%r0\n"
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" br %r14\n"
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#elif defined (__zarch__)
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" lr %r0,%r2\n"
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" st %r14,56(%r15)\n"
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" ahi %r15,-96\n"
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" brasl %r14,r0x2@plt\n"
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" ahi %r15,96\n"
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" l %r14,56(%r15)\n"
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" lr %r2,%r0\n"
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" br %r14\n"
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#else
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" lr %r0,%r2\n"
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" st %r14,56(%r15)\n"
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" ahi %r15,-96\n"
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" balr %r14,0\n"
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" l %r14,1f-.(%r14)\n"
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" basr %r14,%r14\n"
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" ahi %r15,96\n"
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" l %r14,56(%r15)\n"
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" lr %r2,%r0\n"
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" br %r14\n"
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"1: .long r0x2\n"
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#endif
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);
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static int
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do_test (void)
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{
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int i;
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unsigned long r0;
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const char *run;
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for (i = 0; i < 2; i++)
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{
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run = (i == 0) ? "lazy" : "non-lazy";
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r0 = magic_value;
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printf ("-> %s r0 = 0x%lx\n", run, r0);
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r0 = r0x2_trampoline (r0);
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printf ("<- %s r0 * 2 = 0x%lx\n", run, r0);
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if (r0 != magic_value * 2)
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return EXIT_FAILURE;
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}
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return EXIT_SUCCESS;
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}
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#include <support/test-driver.c>
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