test-mmap.c@ 62086

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Avoid arithmetic on void *
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1	/*
2	* Small test program to verify simulated mmap behaviour.
3	*
4	* When running qemu-linux-user with the -p flag, you may need to tell
5	* this test program about the pagesize because getpagesize() will not reflect
6	* the -p choice. Simply pass one argument beeing the pagesize.
7	*
8	* Copyright (c) 2007 AXIS Communications AB
9	* Written by Edgar E. Iglesias.
10	*
11	* This program is free software; you can redistribute it and/or modify
12	* it under the terms of the GNU General Public License as published by
13	* the Free Software Foundation; either version 2 of the License, or
14	* (at your option) any later version.
15	*
16	* This program is distributed in the hope that it will be useful,
17	* but WITHOUT ANY WARRANTY; without even the implied warranty of
18	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19	* GNU General Public License for more details.
20	*
21	* You should have received a copy of the GNU General Public License
22	* along with this program; if not, see <http://www.gnu.org/licenses/>.
23	*/
24
25	/*
26	* Oracle GPL Disclaimer: For the avoidance of doubt, except that if any license choice
27	* other than GPL or LGPL is available it will apply instead, Oracle elects to use only
28	* the General Public License version 2 (GPLv2) at this time for any software where
29	* a choice of GPL license versions is made available with the language indicating
30	* that GPLv2 or any later version may be used, or where a choice of which version
31	* of the GPL is applied is otherwise unspecified.
32	*/
33
34	#include <stdio.h>
35	#include <stdlib.h>
36	#include <stdint.h>
37	#include <string.h>
38	#include <unistd.h>
39
40	#include <sys/mman.h>
41
42	#define D(x)
43
44	#define fail_unless(x) \
45	do \
46	{ \
47	if (!(x)) { \
48	fprintf (stderr, "FAILED at %s:%d\n", __FILE__, __LINE__); \
49	exit (EXIT_FAILURE); \
50	} \
51	} while (0);
52
53	unsigned char *dummybuf;
54	static unsigned int pagesize;
55	static unsigned int pagemask;
56	int test_fd;
57	size_t test_fsize;
58
59	void check_aligned_anonymous_unfixed_mmaps(void)
60	{
61	void *p1;
62	void *p2;
63	void *p3;
64	void *p4;
65	void *p5;
66	uintptr_t p;
67	int i;
68
69	fprintf (stderr, "%s", __func__);
70	for (i = 0; i < 0x1fff; i++)
71	{
72	size_t len;
73
74	len = pagesize + (pagesize * i & 7);
75	p1 = mmap(NULL, len, PROT_READ,
76	MAP_PRIVATE \| MAP_ANONYMOUS, -1, 0);
77	p2 = mmap(NULL, len, PROT_READ,
78	MAP_PRIVATE \| MAP_ANONYMOUS, -1, 0);
79	p3 = mmap(NULL, len, PROT_READ,
80	MAP_PRIVATE \| MAP_ANONYMOUS, -1, 0);
81	p4 = mmap(NULL, len, PROT_READ,
82	MAP_PRIVATE \| MAP_ANONYMOUS, -1, 0);
83	p5 = mmap(NULL, len, PROT_READ,
84	MAP_PRIVATE \| MAP_ANONYMOUS, -1, 0);
85
86	/* Make sure we get pages aligned with the pagesize. The
87	target expects this. */
88	fail_unless (p1 != MAP_FAILED);
89	fail_unless (p2 != MAP_FAILED);
90	fail_unless (p3 != MAP_FAILED);
91	fail_unless (p4 != MAP_FAILED);
92	fail_unless (p5 != MAP_FAILED);
93	p = (uintptr_t) p1;
94	D(printf ("p=%x\n", p));
95	fail_unless ((p & pagemask) == 0);
96	p = (uintptr_t) p2;
97	fail_unless ((p & pagemask) == 0);
98	p = (uintptr_t) p3;
99	fail_unless ((p & pagemask) == 0);
100	p = (uintptr_t) p4;
101	fail_unless ((p & pagemask) == 0);
102	p = (uintptr_t) p5;
103	fail_unless ((p & pagemask) == 0);
104
105	/* Make sure we can read from the entire area. */
106	memcpy (dummybuf, p1, pagesize);
107	memcpy (dummybuf, p2, pagesize);
108	memcpy (dummybuf, p3, pagesize);
109	memcpy (dummybuf, p4, pagesize);
110	memcpy (dummybuf, p5, pagesize);
111
112	munmap (p1, len);
113	munmap (p2, len);
114	munmap (p3, len);
115	munmap (p4, len);
116	munmap (p5, len);
117	}
118	fprintf (stderr, " passed\n");
119	}
120
121	void check_large_anonymous_unfixed_mmap(void)
122	{
123	void *p1;
124	uintptr_t p;
125	size_t len;
126
127	fprintf (stderr, "%s", __func__);
128
129	len = 0x02000000;
130	p1 = mmap(NULL, len, PROT_READ,
131	MAP_PRIVATE \| MAP_ANONYMOUS, -1, 0);
132
133	/* Make sure we get pages aligned with the pagesize. The
134	target expects this. */
135	fail_unless (p1 != MAP_FAILED);
136	p = (uintptr_t) p1;
137	fail_unless ((p & pagemask) == 0);
138
139	/* Make sure we can read from the entire area. */
140	memcpy (dummybuf, p1, pagesize);
141	munmap (p1, len);
142	fprintf (stderr, " passed\n");
143	}
144
145	void check_aligned_anonymous_unfixed_colliding_mmaps(void)
146	{
147	char *p1;
148	char *p2;
149	char *p3;
150	uintptr_t p;
151	int i;
152
153	fprintf (stderr, "%s", __func__);
154	for (i = 0; i < 0x2fff; i++)
155	{
156	int nlen;
157	p1 = mmap(NULL, pagesize, PROT_READ,
158	MAP_PRIVATE \| MAP_ANONYMOUS, -1, 0);
159	fail_unless (p1 != MAP_FAILED);
160	p = (uintptr_t) p1;
161	fail_unless ((p & pagemask) == 0);
162	memcpy (dummybuf, p1, pagesize);
163
164	p2 = mmap(NULL, pagesize, PROT_READ,
165	MAP_PRIVATE \| MAP_ANONYMOUS, -1, 0);
166	fail_unless (p2 != MAP_FAILED);
167	p = (uintptr_t) p2;
168	fail_unless ((p & pagemask) == 0);
169	memcpy (dummybuf, p2, pagesize);
170
171
172	munmap (p1, pagesize);
173	nlen = pagesize * 8;
174	p3 = mmap(NULL, nlen, PROT_READ,
175	MAP_PRIVATE \| MAP_ANONYMOUS, -1, 0);
176
177	/* Check if the mmaped areas collide. */
178	if (p3 < p2
179	&& (p3 + nlen) > p2)
180	fail_unless (0);
181
182	memcpy (dummybuf, p3, pagesize);
183
184	/* Make sure we get pages aligned with the pagesize. The
185	target expects this. */
186	fail_unless (p3 != MAP_FAILED);
187	p = (uintptr_t) p3;
188	fail_unless ((p & pagemask) == 0);
189	munmap (p2, pagesize);
190	munmap (p3, nlen);
191	}
192	fprintf (stderr, " passed\n");
193	}
194
195	void check_aligned_anonymous_fixed_mmaps(void)
196	{
197	char *addr;
198	void *p1;
199	uintptr_t p;
200	int i;
201
202	/* Find a suitable address to start with. */
203	addr = mmap(NULL, pagesize * 40, PROT_READ \| PROT_WRITE,
204	MAP_PRIVATE \| MAP_ANONYMOUS,
205	-1, 0);
206	fprintf (stderr, "%s addr=%p", __func__, addr);
207	fail_unless (addr != MAP_FAILED);
208
209	for (i = 0; i < 40; i++)
210	{
211	/* Create submaps within our unfixed map. */
212	p1 = mmap(addr, pagesize, PROT_READ,
213	MAP_PRIVATE \| MAP_ANONYMOUS \| MAP_FIXED,
214	-1, 0);
215	/* Make sure we get pages aligned with the pagesize.
216	The target expects this. */
217	p = (uintptr_t) p1;
218	fail_unless (p1 == addr);
219	fail_unless ((p & pagemask) == 0);
220	memcpy (dummybuf, p1, pagesize);
221	munmap (p1, pagesize);
222	addr += pagesize;
223	}
224	fprintf (stderr, " passed\n");
225	}
226
227	void check_aligned_anonymous_fixed_mmaps_collide_with_host(void)
228	{
229	char *addr;
230	void *p1;
231	uintptr_t p;
232	int i;
233
234	/* Find a suitable address to start with. Right were the x86 hosts
235	stack is. */
236	addr = ((void *)0x80000000);
237	fprintf (stderr, "%s addr=%p", __func__, addr);
238	fprintf (stderr, "FIXME: QEMU fails to track pages used by the host.");
239
240	for (i = 0; i < 20; i++)
241	{
242	/* Create submaps within our unfixed map. */
243	p1 = mmap(addr, pagesize, PROT_READ \| PROT_WRITE,
244	MAP_PRIVATE \| MAP_ANONYMOUS \| MAP_FIXED,
245	-1, 0);
246	/* Make sure we get pages aligned with the pagesize.
247	The target expects this. */
248	p = (uintptr_t) p1;
249	fail_unless (p1 == addr);
250	fail_unless ((p & pagemask) == 0);
251	memcpy (p1, dummybuf, pagesize);
252	munmap (p1, pagesize);
253	addr += pagesize;
254	}
255	fprintf (stderr, " passed\n");
256	}
257
258	void check_file_unfixed_mmaps(void)
259	{
260	unsigned int p1, p2, *p3;
261	uintptr_t p;
262	int i;
263
264	fprintf (stderr, "%s", __func__);
265	for (i = 0; i < 0x10; i++)
266	{
267	size_t len;
268
269	len = pagesize;
270	p1 = mmap(NULL, len, PROT_READ,
271	MAP_PRIVATE,
272	test_fd, 0);
273	p2 = mmap(NULL, len, PROT_READ,
274	MAP_PRIVATE,
275	test_fd, pagesize);
276	p3 = mmap(NULL, len, PROT_READ,
277	MAP_PRIVATE,
278	test_fd, pagesize * 2);
279
280	fail_unless (p1 != MAP_FAILED);
281	fail_unless (p2 != MAP_FAILED);
282	fail_unless (p3 != MAP_FAILED);
283
284	/* Make sure we get pages aligned with the pagesize. The
285	target expects this. */
286	p = (uintptr_t) p1;
287	fail_unless ((p & pagemask) == 0);
288	p = (uintptr_t) p2;
289	fail_unless ((p & pagemask) == 0);
290	p = (uintptr_t) p3;
291	fail_unless ((p & pagemask) == 0);
292
293	/* Verify that the file maps was made correctly. */
294	D(printf ("p1=%d p2=%d p3=%d\n", p1, p2, *p3));
295	fail_unless (*p1 == 0);
296	fail_unless (p2 == (pagesize / sizeof p2));
297	fail_unless (p3 == ((pagesize 2) / sizeof *p3));
298
299	memcpy (dummybuf, p1, pagesize);
300	memcpy (dummybuf, p2, pagesize);
301	memcpy (dummybuf, p3, pagesize);
302	munmap (p1, len);
303	munmap (p2, len);
304	munmap (p3, len);
305	}
306	fprintf (stderr, " passed\n");
307	}
308
309	void check_file_unfixed_eof_mmaps(void)
310	{
311	char *cp;
312	unsigned int *p1;
313	uintptr_t p;
314	int i;
315
316	fprintf (stderr, "%s", __func__);
317	for (i = 0; i < 0x10; i++)
318	{
319	p1 = mmap(NULL, pagesize, PROT_READ,
320	MAP_PRIVATE,
321	test_fd,
322	(test_fsize - sizeof *p1) & ~pagemask);
323
324	fail_unless (p1 != MAP_FAILED);
325
326	/* Make sure we get pages aligned with the pagesize. The
327	target expects this. */
328	p = (uintptr_t) p1;
329	fail_unless ((p & pagemask) == 0);
330	/* Verify that the file maps was made correctly. */
331	fail_unless (p1[(test_fsize & pagemask) / sizeof *p1 - 1]
332	== ((test_fsize - sizeof p1) / sizeof p1));
333
334	/* Verify that the end of page is accessable and zeroed. */
335	cp = (void *) p1;
336	fail_unless (cp[pagesize - 4] == 0);
337	munmap (p1, pagesize);
338	}
339	fprintf (stderr, " passed\n");
340	}
341
342	void check_file_fixed_eof_mmaps(void)
343	{
344	char *addr;
345	char *cp;
346	unsigned int *p1;
347	uintptr_t p;
348	int i;
349
350	/* Find a suitable address to start with. */
351	addr = mmap(NULL, pagesize * 44, PROT_READ,
352	MAP_PRIVATE \| MAP_ANONYMOUS,
353	-1, 0);
354
355	fprintf (stderr, "%s addr=%p", __func__, (void *)addr);
356	fail_unless (addr != MAP_FAILED);
357
358	for (i = 0; i < 0x10; i++)
359	{
360	/* Create submaps within our unfixed map. */
361	p1 = mmap(addr, pagesize, PROT_READ,
362	MAP_PRIVATE \| MAP_FIXED,
363	test_fd,
364	(test_fsize - sizeof *p1) & ~pagemask);
365
366	fail_unless (p1 != MAP_FAILED);
367
368	/* Make sure we get pages aligned with the pagesize. The
369	target expects this. */
370	p = (uintptr_t) p1;
371	fail_unless ((p & pagemask) == 0);
372
373	/* Verify that the file maps was made correctly. */
374	fail_unless (p1[(test_fsize & pagemask) / sizeof *p1 - 1]
375	== ((test_fsize - sizeof p1) / sizeof p1));
376
377	/* Verify that the end of page is accessable and zeroed. */
378	cp = (void *)p1;
379	fail_unless (cp[pagesize - 4] == 0);
380	munmap (p1, pagesize);
381	addr += pagesize;
382	}
383	fprintf (stderr, " passed\n");
384	}
385
386	void check_file_fixed_mmaps(void)
387	{
388	unsigned char *addr;
389	unsigned int p1, p2, p3, p4;
390	int i;
391
392	/* Find a suitable address to start with. */
393	addr = mmap(NULL, pagesize * 40 * 4, PROT_READ,
394	MAP_PRIVATE \| MAP_ANONYMOUS,
395	-1, 0);
396	fprintf (stderr, "%s addr=%p", __func__, (void *)addr);
397	fail_unless (addr != MAP_FAILED);
398
399	for (i = 0; i < 40; i++)
400	{
401	p1 = mmap(addr, pagesize, PROT_READ,
402	MAP_PRIVATE \| MAP_FIXED,
403	test_fd, 0);
404	p2 = mmap(addr + pagesize, pagesize, PROT_READ,
405	MAP_PRIVATE \| MAP_FIXED,
406	test_fd, pagesize);
407	p3 = mmap(addr + pagesize * 2, pagesize, PROT_READ,
408	MAP_PRIVATE \| MAP_FIXED,
409	test_fd, pagesize * 2);
410	p4 = mmap(addr + pagesize * 3, pagesize, PROT_READ,
411	MAP_PRIVATE \| MAP_FIXED,
412	test_fd, pagesize * 3);
413
414	/* Make sure we get pages aligned with the pagesize.
415	The target expects this. */
416	fail_unless (p1 == (void *)addr);
417	fail_unless (p2 == (void *)(addr + pagesize));
418	fail_unless (p3 == (void )(addr + pagesize 2));
419	fail_unless (p4 == (void )(addr + pagesize 3));
420
421	/* Verify that the file maps was made correctly. */
422	fail_unless (*p1 == 0);
423	fail_unless (p2 == (pagesize / sizeof p2));
424	fail_unless (p3 == ((pagesize 2) / sizeof *p3));
425	fail_unless (p4 == ((pagesize 3) / sizeof *p4));
426
427	memcpy (dummybuf, p1, pagesize);
428	memcpy (dummybuf, p2, pagesize);
429	memcpy (dummybuf, p3, pagesize);
430	memcpy (dummybuf, p4, pagesize);
431
432	munmap (p1, pagesize);
433	munmap (p2, pagesize);
434	munmap (p3, pagesize);
435	munmap (p4, pagesize);
436	addr += pagesize * 4;
437	}
438	fprintf (stderr, " passed\n");
439	}
440
441	int main(int argc, char **argv)
442	{
443	char tempname[] = "/tmp/.cmmapXXXXXX";
444	unsigned int i;
445
446	/* Trust the first argument, otherwise probe the system for our
447	pagesize. */
448	if (argc > 1)
449	pagesize = strtoul(argv[1], NULL, 0);
450	else
451	pagesize = sysconf(_SC_PAGESIZE);
452
453	/* Assume pagesize is a power of two. */
454	pagemask = pagesize - 1;
455	dummybuf = malloc (pagesize);
456	printf ("pagesize=%u pagemask=%x\n", pagesize, pagemask);
457
458	test_fd = mkstemp(tempname);
459	unlink(tempname);
460
461	/* Fill the file with int's counting from zero and up. */
462	for (i = 0; i < (pagesize * 4) / sizeof i; i++)
463	write (test_fd, &i, sizeof i);
464	/* Append a few extra writes to make the file end at non
465	page boundary. */
466	write (test_fd, &i, sizeof i); i++;
467	write (test_fd, &i, sizeof i); i++;
468	write (test_fd, &i, sizeof i); i++;
469
470	test_fsize = lseek(test_fd, 0, SEEK_CUR);
471
472	/* Run the tests. */
473	check_aligned_anonymous_unfixed_mmaps();
474	check_aligned_anonymous_unfixed_colliding_mmaps();
475	check_aligned_anonymous_fixed_mmaps();
476	check_file_unfixed_mmaps();
477	check_file_fixed_mmaps();
478	check_file_fixed_eof_mmaps();
479	check_file_unfixed_eof_mmaps();
480
481	/* Fails at the moment. */
482	/* check_aligned_anonymous_fixed_mmaps_collide_with_host(); */
483
484	return EXIT_SUCCESS;
485	}

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