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02782fd128
Starting with commit e57d8fc97b
"S390: Always use svc 0"
clone clobbers the call-saved register r7 in error case:
function or stack is NULL.
This patch restores the saved registers also in the error case.
Furthermore the existing test misc/tst-clone is extended to check
all error cases and that clone does not clobber registers in this
error case.
101 lines
2.5 KiB
C
101 lines
2.5 KiB
C
/* Test for proper error/errno handling in clone.
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Copyright (C) 2006-2024 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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/* BZ #2386, BZ #31402 */
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#include <errno.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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#include <sched.h>
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#include <stackinfo.h> /* For _STACK_GROWS_{UP,DOWN}. */
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#include <support/check.h>
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volatile unsigned v = 0xdeadbeef;
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int child_fn(void *arg)
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{
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puts ("FAIL: in child_fn(); should not be here");
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exit(1);
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}
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static int
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__attribute__((noinline))
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do_clone (int (*fn)(void *), void *stack)
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{
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int result;
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unsigned int a = v;
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unsigned int b = v;
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unsigned int c = v;
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unsigned int d = v;
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unsigned int e = v;
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unsigned int f = v;
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unsigned int g = v;
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unsigned int h = v;
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unsigned int i = v;
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unsigned int j = v;
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unsigned int k = v;
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unsigned int l = v;
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unsigned int m = v;
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unsigned int n = v;
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unsigned int o = v;
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result = clone (fn, stack, 0, NULL);
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/* Check that clone does not clobber call-saved registers. */
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TEST_VERIFY (a == v && b == v && c == v && d == v && e == v && f == v
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&& g == v && h == v && i == v && j == v && k == v && l == v
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&& m == v && n == v && o == v);
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return result;
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}
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static void
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__attribute__((noinline))
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do_test_single (int (*fn)(void *), void *stack)
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{
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printf ("%s (fn=%p, stack=%p)\n", __FUNCTION__, fn, stack);
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errno = 0;
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int result = do_clone (fn, stack);
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TEST_COMPARE (errno, EINVAL);
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TEST_COMPARE (result, -1);
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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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char st[128 * 1024] __attribute__ ((aligned));
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void *stack = NULL;
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#if _STACK_GROWS_DOWN
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stack = st + sizeof (st);
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#elif _STACK_GROWS_UP
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stack = st;
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#else
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# error "Define either _STACK_GROWS_DOWN or _STACK_GROWS_UP"
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#endif
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do_test_single (child_fn, NULL);
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do_test_single (NULL, stack);
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do_test_single (NULL, NULL);
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return 0;
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}
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#include <support/test-driver.c>
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