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92a7d13439
In the x86-64 clone wrapper, align child stack to 16 bytes per the x86-64 psABI. Reviewed-by: Carlos O'Donell <carlos@redhat.com>
97 lines
2.5 KiB
C
97 lines
2.5 KiB
C
/* Verify that the clone wrapper properly aligns the child stack.
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Copyright (C) 2021 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 <sched.h>
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#include <stdbool.h>
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#include <stdint.h>
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#include <stdio.h>
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#include <string.h>
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#include <sys/wait.h>
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#include <unistd.h>
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#include <libc-pointer-arith.h>
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#include <tst-stack-align.h>
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#include <stackinfo.h>
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#include <support/xunistd.h>
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#include <support/check.h>
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static int
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check_stack_alignment (void *arg)
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{
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bool ok = true;
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puts ("in f");
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if (TEST_STACK_ALIGN ())
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ok = false;
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return ok ? 0 : 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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puts ("in do_test");
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if (TEST_STACK_ALIGN ())
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FAIL_EXIT1 ("stack isn't aligned\n");
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#ifdef __ia64__
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# define STACK_SIZE (256 * 1024)
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#else
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# define STACK_SIZE (128 * 1024)
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#endif
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char st[STACK_SIZE + 1];
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/* NB: Align child stack to 1 byte. */
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char *stack = PTR_ALIGN_UP (&st[0], 2) + 1;
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#ifdef __ia64__
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extern int __clone2 (int (*__fn) (void *__arg), void *__child_stack_base,
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size_t __child_stack_size, int __flags,
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void *__arg, ...);
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pid_t p = __clone2 (check_stack_alignment, stack, STACK_SIZE, 0, 0);
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#else
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# if _STACK_GROWS_DOWN
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pid_t p = clone (check_stack_alignment, stack + STACK_SIZE, 0, 0);
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# elif _STACK_GROWS_UP
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pid_t p = clone (check_stack_alignment, stack, 0, 0);
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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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#endif
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/* Clone must not fail. */
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TEST_VERIFY_EXIT (p != -1);
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int e;
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xwaitpid (p, &e, __WCLONE);
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if (!WIFEXITED (e))
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{
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if (WIFSIGNALED (e))
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printf ("died from signal %s\n", strsignal (WTERMSIG (e)));
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FAIL_EXIT1 ("process did not terminate correctly");
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}
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if (WEXITSTATUS (e) != 0)
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FAIL_EXIT1 ("exit code %d", WEXITSTATUS (e));
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return 0;
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}
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#include <support/test-driver.c>
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