1 /* Copyright (C) 2001-2013 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
4 The GNU C Library is free software; you can redistribute it and/or
5 modify it under the terms of the GNU Lesser General Public
6 License as published by the Free Software Foundation; either
7 version 2.1 of the License, or (at your option) any later version.
9 The GNU C Library is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 Lesser General Public License for more details.
14 You should have received a copy of the GNU Lesser General Public
15 License along with the GNU C Library; if not, see
16 <http://www.gnu.org/licenses/>. */
25 static ucontext_t ctx[3];
30 static char st2[32768];
33 f1 (int a0, int a1, int a2, int a3)
35 printf ("start f1(a0=%x,a1=%x,a2=%x,a3=%x)\n", a0, a1, a2, a3);
37 if (a0 != 1 || a1 != 2 || a2 != 3 || a3 != -4)
39 puts ("arg mismatch");
43 if (swapcontext (&ctx[1], &ctx[2]) != 0)
45 printf ("%s: swapcontext: %m\n", __FUNCTION__);
59 printf ("&on_stack=%p\n", on_stack);
60 if (on_stack < st2 || on_stack >= st2 + sizeof (st2))
62 printf ("%s: memory stack is not where it belongs!", __FUNCTION__);
66 if (swapcontext (&ctx[2], &ctx[1]) != 0)
68 printf ("%s: swapcontext: %m\n", __FUNCTION__);
76 test_stack(volatile int a, volatile int b,
77 volatile int c, volatile int d)
83 /* Test for cases where getcontext is clobbering the callers
84 stack, including parameters. */
89 printf ("%s: getcontext clobbers parm a\n", __FUNCTION__);
95 printf ("%s: getcontext clobbers parm b\n", __FUNCTION__);
101 printf ("%s: getcontext clobbers parm c\n", __FUNCTION__);
107 printf ("%s: getcontext clobbers parm d\n", __FUNCTION__);
113 printf ("%s: getcontext clobbers varible e\n", __FUNCTION__);
119 printf ("%s: getcontext clobbers variable f\n", __FUNCTION__);
127 static int back_in_main;
133 if (back_in_main == 0)
135 puts ("program did not reach main again");
144 atexit (check_called);
148 puts ("making contexts");
149 if (getcontext (&ctx[1]) != 0)
157 printf ("%s: getcontext: %m\n", __FUNCTION__);
161 test_stack (1, 2, 3, 4);
163 /* Play some tricks with this context. */
165 if (setcontext (&ctx[1]) != 0)
167 printf ("%s: setcontext: %m\n", __FUNCTION__);
172 printf ("%s: 'global' not incremented twice\n", __FUNCTION__);
176 ctx[1].uc_stack.ss_sp = st1;
177 ctx[1].uc_stack.ss_size = sizeof st1;
178 ctx[1].uc_link = &ctx[0];
180 ucontext_t tempctx = ctx[1];
181 makecontext (&ctx[1], (void (*) (void)) f1, 4, 1, 2, 3, -4);
183 /* Without this check, a stub makecontext can make us spin forever. */
184 if (memcmp (&tempctx, &ctx[1], sizeof ctx[1]) == 0)
186 puts ("makecontext was a no-op, presuming not implemented");
191 if (getcontext (&ctx[2]) != 0)
193 printf ("%s: second getcontext: %m\n", __FUNCTION__);
196 ctx[2].uc_stack.ss_sp = st2;
197 ctx[2].uc_stack.ss_size = sizeof st2;
198 ctx[2].uc_link = &ctx[1];
199 makecontext (&ctx[2], f2, 0);
201 puts ("swapping contexts");
202 if (swapcontext (&ctx[0], &ctx[2]) != 0)
204 printf ("%s: swapcontext: %m\n", __FUNCTION__);
207 puts ("back at main program");
212 puts ("didn't reach f1");
217 puts ("didn't reach f2");
221 puts ("test succeeded");