aboutsummaryrefslogtreecommitdiff
path: root/stdlib/tst-makecontext3.c
blob: a44169ae363faadc8f1e6829363ab75dd3a40335 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
/* Copyright (C) 2001,2002,2004,2006,2009 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, write to the Free
   Software Foundation, 51 Franklin Street - Fifth Floor, Boston, MA
   02110-1301, USA.  */

#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <ucontext.h>
#include <unistd.h>

static ucontext_t ctx[3];

static int was_in_f1;
static int was_in_f2;

static char st2[32768];

static volatile int flag;

static void
f1 (int a00, int a01, int a02, int a03, int a04, int a05, int a06, int a07,
    int a08, int a09, int a10, int a11, int a12, int a13, int a14, int a15,
    int a16, int a17, int a18, int a19, int a20, int a21, int a22, int a23,
    int a24, int a25, int a26, int a27, int a28, int a29, int a30, int a31,
    int a32)
{
  printf ("start f1(a00=%08x,a01=%08x,a02=%08x,a03=%08x,\n"
	  "         a04=%08x,a05=%08x,a06=%08x,a07=%08x,\n"
	  "         a08=%08x,a09=%08x,a10=%08x,a11=%08x,\n"
	  "         a12=%08x,a13=%08x,a14=%08x,a15=%08x,\n"
	  "         a16=%08x,a17=%08x,a18=%08x,a19=%08x,\n"
	  "         a20=%08x,a21=%08x,a22=%08x,a23=%08x,\n"
	  "         a24=%08x,a25=%08x,a26=%08x,a27=%08x,\n"
	  "         a28=%08x,a29=%08x,a30=%08x,a31=%08x,\n"
	  "         a32=%08x) [%d]\n",
	  a00, a01, a02, a03, a04, a05, a06, a07,
	  a08, a09, a10, a11, a12, a13, a14, a15,
	  a16, a17, a18, a19, a20, a21, a22, a23,
	  a24, a25, a26, a27, a28, a29, a30, a31,
	  a32, flag);

  if (a00 != (0x00000001 << flag) || a01 != (0x00000004 << flag)
      || a02 != (0x00000012 << flag) || a03 != (0x00000048 << flag)
      || a04 != (0x00000123 << flag) || a05 != (0x0000048d << flag)
      || a06 != (0x00001234 << flag) || a07 != (0x000048d1 << flag)
      || a08 != (0x00012345 << flag) || a09 != (0x00048d15 << flag)
      || a10 != (0x00123456 << flag) || a11 != (0x0048d159 << flag)
      || a12 != (0x01234567 << flag) || a13 != (0x048d159e << flag)
      || a14 != (0x12345678 << flag) || a15 != (0x48d159e2 << flag)
      || a16 != (0x23456789 << flag) || a17 != (0x8d159e26 << flag)
      || a18 != (0x3456789a << flag) || a19 != (0xd159e26a << flag)
      || a20 != (0x456789ab << flag) || a21 != (0x159e26af << flag)
      || a22 != (0x56789abc << flag) || a23 != (0x59e26af3 << flag)
      || a24 != (0x6789abcd << flag) || a25 != (0x9e26af37 << flag)
      || a26 != (0x789abcde << flag) || a27 != (0xe26af37b << flag)
      || a28 != (0x89abcdef << flag) || a29 != (0x26af37bc << flag)
      || a30 != (0x9abcdef0 << flag) || a31 != (0x6af37bc3 << flag)
      || a32 != (0xabcdef0f << flag))
    {
      puts ("arg mismatch");
      exit (-1);
    }

  if (flag && swapcontext (&ctx[1], &ctx[2]) != 0)
    {
      printf ("%s: swapcontext: %m\n", __FUNCTION__);
      exit (1);
    }
  printf ("finish f1 [%d]\n", flag);
  flag++;
  was_in_f1++;
}

static void
f2 (void)
{
  puts ("start f2");
  if (swapcontext (&ctx[2], &ctx[1]) != 0)
    {
      printf ("%s: swapcontext: %m\n", __FUNCTION__);
      exit (1);
    }
  puts ("finish f2");
  was_in_f2 = 1;
}

volatile int global;


static int back_in_main;


static void
check_called (void)
{
  if (back_in_main == 0)
    {
      puts ("program did not reach main again");
      _exit (1);
    }
}


int
main (void)
{
  atexit (check_called);

  char st1[32768];

  puts ("making contexts");
  if (getcontext (&ctx[0]) != 0)
    {
      if (errno == ENOSYS)
	{
	  back_in_main = 1;
	  exit (0);
	}

      printf ("%s: getcontext: %m\n", __FUNCTION__);
      exit (1);
    }

  if (getcontext (&ctx[1]) != 0)
    {
      printf ("%s: getcontext: %m\n", __FUNCTION__);
      exit (1);
    }

  ctx[1].uc_stack.ss_sp = st1;
  ctx[1].uc_stack.ss_size = sizeof st1;
  ctx[1].uc_link = &ctx[0];
  errno = 0;
  makecontext (&ctx[1], (void (*) (void)) f1, 33,
	       0x00000001 << flag, 0x00000004 << flag,
	       0x00000012 << flag, 0x00000048 << flag,
	       0x00000123 << flag, 0x0000048d << flag,
	       0x00001234 << flag, 0x000048d1 << flag,
	       0x00012345 << flag, 0x00048d15 << flag,
	       0x00123456 << flag, 0x0048d159 << flag,
	       0x01234567 << flag, 0x048d159e << flag,
	       0x12345678 << flag, 0x48d159e2 << flag,
	       0x23456789 << flag, 0x8d159e26 << flag,
	       0x3456789a << flag, 0xd159e26a << flag,
	       0x456789ab << flag, 0x159e26af << flag,
	       0x56789abc << flag, 0x59e26af3 << flag,
	       0x6789abcd << flag, 0x9e26af37 << flag,
	       0x789abcde << flag, 0xe26af37b << flag,
	       0x89abcdef << flag, 0x26af37bc << flag,
	       0x9abcdef0 << flag, 0x6af37bc3 << flag,
	       0xabcdef0f << flag);

  /* Without this check, a stub makecontext can make us spin forever.  */
  if (errno == ENOSYS)
    {
      puts ("makecontext not implemented");
      back_in_main = 1;
      return 0;
    }

  /* Play some tricks with this context.  */
  if (++global == 1)
    if (setcontext (&ctx[1]) != 0)
      {
	printf ("%s: setcontext: %m\n", __FUNCTION__);
	exit (1);
      }
  if (global != 2)
    {
      printf ("%s: 'global' not incremented twice\n", __FUNCTION__);
      exit (1);
    }

  if (getcontext (&ctx[2]) != 0)
    {
      printf ("%s: second getcontext: %m\n", __FUNCTION__);
      exit (1);
    }
  ctx[2].uc_stack.ss_sp = st2;
  ctx[2].uc_stack.ss_size = sizeof st2;
  ctx[2].uc_link = &ctx[1];
  makecontext (&ctx[2], f2, 0);

  puts ("swapping contexts");
  if (swapcontext (&ctx[0], &ctx[2]) != 0)
    {
      printf ("%s: swapcontext: %m\n", __FUNCTION__);
      exit (1);
    }
  puts ("back at main program");
  back_in_main = 1;

  if (was_in_f1 < 2)
    {
      puts ("didn't reach f1 twice");
      exit (1);
    }
  if (was_in_f2 == 0)
    {
      puts ("didn't reach f2");
      exit (1);
    }

  puts ("test succeeded");
  return 0;
}