1 /* Verify that the clone wrapper properly aligns the child stack.
2    Copyright (C) 2021 Free Software Foundation, Inc.
3    This file is part of the GNU C Library.
4 
5    The GNU C Library is free software; you can redistribute it and/or
6    modify it under the terms of the GNU Lesser General Public
7    License as published by the Free Software Foundation; either
8    version 2.1 of the License, or (at your option) any later version.
9 
10    The GNU C Library is distributed in the hope that it will be useful,
11    but WITHOUT ANY WARRANTY; without even the implied warranty of
12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
13    Lesser General Public License for more details.
14 
15    You should have received a copy of the GNU Lesser General Public
16    License along with the GNU C Library; if not, see
17    <https://www.gnu.org/licenses/>.  */
18 
19 #include <sched.h>
20 #include <stdbool.h>
21 #include <stdint.h>
22 #include <stdio.h>
23 #include <string.h>
24 #include <sys/wait.h>
25 #include <unistd.h>
26 #include <libc-pointer-arith.h>
27 #include <tst-stack-align.h>
28 #include <stackinfo.h>
29 #include <support/xunistd.h>
30 #include <support/check.h>
31 
32 static int
check_stack_alignment(void * arg)33 check_stack_alignment (void *arg)
34 {
35   bool ok = true;
36 
37   puts ("in f");
38 
39   if (TEST_STACK_ALIGN ())
40     ok = false;
41 
42   return ok ? 0 : 1;
43 }
44 
45 static int
do_test(void)46 do_test (void)
47 {
48   puts ("in do_test");
49 
50   if (TEST_STACK_ALIGN ())
51     FAIL_EXIT1 ("stack isn't aligned\n");
52 
53 #ifdef __ia64__
54 # define STACK_SIZE (256 * 1024)
55 #else
56 # define STACK_SIZE (128 * 1024)
57 #endif
58 
59   char st[STACK_SIZE + 1];
60   /* NB: Align child stack to 1 byte.  */
61   char *stack = PTR_ALIGN_UP (&st[0], 2) + 1;
62 
63 #ifdef __ia64__
64   extern int __clone2 (int (*__fn) (void *__arg), void *__child_stack_base,
65 		       size_t __child_stack_size, int __flags,
66 		       void *__arg, ...);
67   pid_t p = __clone2 (check_stack_alignment, stack, STACK_SIZE, 0, 0);
68 #else
69 # if _STACK_GROWS_DOWN
70   pid_t p = clone (check_stack_alignment, stack + STACK_SIZE, 0, 0);
71 # elif _STACK_GROWS_UP
72   pid_t p = clone (check_stack_alignment, stack, 0, 0);
73 # else
74 #  error "Define either _STACK_GROWS_DOWN or _STACK_GROWS_UP"
75 # endif
76 #endif
77 
78   /* Clone must not fail.  */
79   TEST_VERIFY_EXIT (p != -1);
80 
81   int e;
82   xwaitpid (p, &e, __WCLONE);
83   if (!WIFEXITED (e))
84     {
85       if (WIFSIGNALED (e))
86 	printf ("died from signal %s\n", strsignal (WTERMSIG (e)));
87      FAIL_EXIT1 ("process did not terminate correctly");
88     }
89 
90   if (WEXITSTATUS (e) != 0)
91     FAIL_EXIT1 ("exit code %d", WEXITSTATUS (e));
92 
93   return 0;
94 }
95 
96 #include <support/test-driver.c>
97