--- /dev/null
+/*
+ * Small test program to verify simulated mmap behaviour.
+ *
+ * When running qemu-linux-user with the -p flag, you may need to tell
+ * this test program about the pagesize because getpagesize() will not reflect
+ * the -p choice. Simply pass one argument being the pagesize.
+ *
+ * Copyright (c) 2007 AXIS Communications AB
+ * Written by Edgar E. Iglesias.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <stdint.h>
+#include <string.h>
+#include <unistd.h>
+
+#include <sys/mman.h>
+
+#define D(x)
+
+#define fail_unless(x) \
+do \
+{ \
+ if (!(x)) { \
+ fprintf (stderr, "FAILED at %s:%d\n", __FILE__, __LINE__); \
+ exit (EXIT_FAILURE); \
+ } \
+} while (0);
+
+unsigned char *dummybuf;
+static unsigned int pagesize;
+static unsigned int pagemask;
+int test_fd;
+size_t test_fsize;
+
+void check_aligned_anonymous_unfixed_mmaps(void)
+{
+ void *p1;
+ void *p2;
+ void *p3;
+ void *p4;
+ void *p5;
+ uintptr_t p;
+ int i;
+
+ fprintf (stderr, "%s", __func__);
+ for (i = 0; i < 0x1fff; i++)
+ {
+ size_t len;
+
+ len = pagesize + (pagesize * i & 7);
+ p1 = mmap(NULL, len, PROT_READ,
+ MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
+ p2 = mmap(NULL, len, PROT_READ,
+ MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
+ p3 = mmap(NULL, len, PROT_READ,
+ MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
+ p4 = mmap(NULL, len, PROT_READ,
+ MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
+ p5 = mmap(NULL, len, PROT_READ,
+ MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
+
+ /* Make sure we get pages aligned with the pagesize. The
+ target expects this. */
+ fail_unless (p1 != MAP_FAILED);
+ fail_unless (p2 != MAP_FAILED);
+ fail_unless (p3 != MAP_FAILED);
+ fail_unless (p4 != MAP_FAILED);
+ fail_unless (p5 != MAP_FAILED);
+ p = (uintptr_t) p1;
+ D(printf ("p=%x\n", p));
+ fail_unless ((p & pagemask) == 0);
+ p = (uintptr_t) p2;
+ fail_unless ((p & pagemask) == 0);
+ p = (uintptr_t) p3;
+ fail_unless ((p & pagemask) == 0);
+ p = (uintptr_t) p4;
+ fail_unless ((p & pagemask) == 0);
+ p = (uintptr_t) p5;
+ fail_unless ((p & pagemask) == 0);
+
+ /* Make sure we can read from the entire area. */
+ memcpy (dummybuf, p1, pagesize);
+ memcpy (dummybuf, p2, pagesize);
+ memcpy (dummybuf, p3, pagesize);
+ memcpy (dummybuf, p4, pagesize);
+ memcpy (dummybuf, p5, pagesize);
+
+ munmap (p1, len);
+ munmap (p2, len);
+ munmap (p3, len);
+ munmap (p4, len);
+ munmap (p5, len);
+ }
+ fprintf (stderr, " passed\n");
+}
+
+void check_large_anonymous_unfixed_mmap(void)
+{
+ void *p1;
+ uintptr_t p;
+ size_t len;
+
+ fprintf (stderr, "%s", __func__);
+
+ len = 0x02000000;
+ p1 = mmap(NULL, len, PROT_READ,
+ MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
+
+ /* Make sure we get pages aligned with the pagesize. The
+ target expects this. */
+ fail_unless (p1 != MAP_FAILED);
+ p = (uintptr_t) p1;
+ fail_unless ((p & pagemask) == 0);
+
+ /* Make sure we can read from the entire area. */
+ memcpy (dummybuf, p1, pagesize);
+ munmap (p1, len);
+ fprintf (stderr, " passed\n");
+}
+
+void check_aligned_anonymous_unfixed_colliding_mmaps(void)
+{
+ char *p1;
+ char *p2;
+ char *p3;
+ uintptr_t p;
+ int i;
+
+ fprintf (stderr, "%s", __func__);
+ for (i = 0; i < 0x2fff; i++)
+ {
+ int nlen;
+ p1 = mmap(NULL, pagesize, PROT_READ,
+ MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
+ fail_unless (p1 != MAP_FAILED);
+ p = (uintptr_t) p1;
+ fail_unless ((p & pagemask) == 0);
+ memcpy (dummybuf, p1, pagesize);
+
+ p2 = mmap(NULL, pagesize, PROT_READ,
+ MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
+ fail_unless (p2 != MAP_FAILED);
+ p = (uintptr_t) p2;
+ fail_unless ((p & pagemask) == 0);
+ memcpy (dummybuf, p2, pagesize);
+
+
+ munmap (p1, pagesize);
+ nlen = pagesize * 8;
+ p3 = mmap(NULL, nlen, PROT_READ,
+ MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
+ fail_unless (p3 != MAP_FAILED);
+
+ /* Check if the mmaped areas collide. */
+ if (p3 < p2
+ && (p3 + nlen) > p2)
+ fail_unless (0);
+
+ memcpy (dummybuf, p3, pagesize);
+
+ /* Make sure we get pages aligned with the pagesize. The
+ target expects this. */
+ p = (uintptr_t) p3;
+ fail_unless ((p & pagemask) == 0);
+ munmap (p2, pagesize);
+ munmap (p3, nlen);
+ }
+ fprintf (stderr, " passed\n");
+}
+
+void check_aligned_anonymous_fixed_mmaps(void)
+{
+ char *addr;
+ void *p1;
+ uintptr_t p;
+ int i;
+
+ /* Find a suitable address to start with. */
+ addr = mmap(NULL, pagesize * 40, PROT_READ | PROT_WRITE,
+ MAP_PRIVATE | MAP_ANONYMOUS,
+ -1, 0);
+ fprintf (stderr, "%s addr=%p", __func__, addr);
+ fail_unless (addr != MAP_FAILED);
+
+ for (i = 0; i < 40; i++)
+ {
+ /* Create submaps within our unfixed map. */
+ p1 = mmap(addr, pagesize, PROT_READ,
+ MAP_PRIVATE | MAP_ANONYMOUS | MAP_FIXED,
+ -1, 0);
+ /* Make sure we get pages aligned with the pagesize.
+ The target expects this. */
+ p = (uintptr_t) p1;
+ fail_unless (p1 == addr);
+ fail_unless ((p & pagemask) == 0);
+ memcpy (dummybuf, p1, pagesize);
+ munmap (p1, pagesize);
+ addr += pagesize;
+ }
+ fprintf (stderr, " passed\n");
+}
+
+void check_aligned_anonymous_fixed_mmaps_collide_with_host(void)
+{
+ char *addr;
+ void *p1;
+ uintptr_t p;
+ int i;
+
+ /* Find a suitable address to start with. Right were the x86 hosts
+ stack is. */
+ addr = ((void *)0x80000000);
+ fprintf (stderr, "%s addr=%p", __func__, addr);
+ fprintf (stderr, "FIXME: QEMU fails to track pages used by the host.");
+
+ for (i = 0; i < 20; i++)
+ {
+ /* Create submaps within our unfixed map. */
+ p1 = mmap(addr, pagesize, PROT_READ | PROT_WRITE,
+ MAP_PRIVATE | MAP_ANONYMOUS | MAP_FIXED,
+ -1, 0);
+ /* Make sure we get pages aligned with the pagesize.
+ The target expects this. */
+ p = (uintptr_t) p1;
+ fail_unless (p1 == addr);
+ fail_unless ((p & pagemask) == 0);
+ memcpy (p1, dummybuf, pagesize);
+ munmap (p1, pagesize);
+ addr += pagesize;
+ }
+ fprintf (stderr, " passed\n");
+}
+
+void check_file_unfixed_mmaps(void)
+{
+ unsigned int *p1, *p2, *p3;
+ uintptr_t p;
+ int i;
+
+ fprintf (stderr, "%s", __func__);
+ for (i = 0; i < 0x10; i++)
+ {
+ size_t len;
+
+ len = pagesize;
+ p1 = mmap(NULL, len, PROT_READ,
+ MAP_PRIVATE,
+ test_fd, 0);
+ p2 = mmap(NULL, len, PROT_READ,
+ MAP_PRIVATE,
+ test_fd, pagesize);
+ p3 = mmap(NULL, len, PROT_READ,
+ MAP_PRIVATE,
+ test_fd, pagesize * 2);
+
+ fail_unless (p1 != MAP_FAILED);
+ fail_unless (p2 != MAP_FAILED);
+ fail_unless (p3 != MAP_FAILED);
+
+ /* Make sure we get pages aligned with the pagesize. The
+ target expects this. */
+ p = (uintptr_t) p1;
+ fail_unless ((p & pagemask) == 0);
+ p = (uintptr_t) p2;
+ fail_unless ((p & pagemask) == 0);
+ p = (uintptr_t) p3;
+ fail_unless ((p & pagemask) == 0);
+
+ /* Verify that the file maps was made correctly. */
+ D(printf ("p1=%d p2=%d p3=%d\n", *p1, *p2, *p3));
+ fail_unless (*p1 == 0);
+ fail_unless (*p2 == (pagesize / sizeof *p2));
+ fail_unless (*p3 == ((pagesize * 2) / sizeof *p3));
+
+ memcpy (dummybuf, p1, pagesize);
+ memcpy (dummybuf, p2, pagesize);
+ memcpy (dummybuf, p3, pagesize);
+ munmap (p1, len);
+ munmap (p2, len);
+ munmap (p3, len);
+ }
+ fprintf (stderr, " passed\n");
+}
+
+void check_file_unfixed_eof_mmaps(void)
+{
+ char *cp;
+ unsigned int *p1;
+ uintptr_t p;
+ int i;
+
+ fprintf (stderr, "%s", __func__);
+ for (i = 0; i < 0x10; i++)
+ {
+ p1 = mmap(NULL, pagesize, PROT_READ,
+ MAP_PRIVATE,
+ test_fd,
+ (test_fsize - sizeof *p1) & ~pagemask);
+
+ fail_unless (p1 != MAP_FAILED);
+
+ /* Make sure we get pages aligned with the pagesize. The
+ target expects this. */
+ p = (uintptr_t) p1;
+ fail_unless ((p & pagemask) == 0);
+ /* Verify that the file maps was made correctly. */
+ fail_unless (p1[(test_fsize & pagemask) / sizeof *p1 - 1]
+ == ((test_fsize - sizeof *p1) / sizeof *p1));
+
+ /* Verify that the end of page is accessible and zeroed. */
+ cp = (void *) p1;
+ fail_unless (cp[pagesize - 4] == 0);
+ munmap (p1, pagesize);
+ }
+ fprintf (stderr, " passed\n");
+}
+
+void check_file_fixed_eof_mmaps(void)
+{
+ char *addr;
+ char *cp;
+ unsigned int *p1;
+ uintptr_t p;
+ int i;
+
+ /* Find a suitable address to start with. */
+ addr = mmap(NULL, pagesize * 44, PROT_READ,
+ MAP_PRIVATE | MAP_ANONYMOUS,
+ -1, 0);
+
+ fprintf (stderr, "%s addr=%p", __func__, (void *)addr);
+ fail_unless (addr != MAP_FAILED);
+
+ for (i = 0; i < 0x10; i++)
+ {
+ /* Create submaps within our unfixed map. */
+ p1 = mmap(addr, pagesize, PROT_READ,
+ MAP_PRIVATE | MAP_FIXED,
+ test_fd,
+ (test_fsize - sizeof *p1) & ~pagemask);
+
+ fail_unless (p1 != MAP_FAILED);
+
+ /* Make sure we get pages aligned with the pagesize. The
+ target expects this. */
+ p = (uintptr_t) p1;
+ fail_unless ((p & pagemask) == 0);
+
+ /* Verify that the file maps was made correctly. */
+ fail_unless (p1[(test_fsize & pagemask) / sizeof *p1 - 1]
+ == ((test_fsize - sizeof *p1) / sizeof *p1));
+
+ /* Verify that the end of page is accessible and zeroed. */
+ cp = (void *)p1;
+ fail_unless (cp[pagesize - 4] == 0);
+ munmap (p1, pagesize);
+ addr += pagesize;
+ }
+ fprintf (stderr, " passed\n");
+}
+
+void check_file_fixed_mmaps(void)
+{
+ unsigned char *addr;
+ unsigned int *p1, *p2, *p3, *p4;
+ int i;
+
+ /* Find a suitable address to start with. */
+ addr = mmap(NULL, pagesize * 40 * 4, PROT_READ,
+ MAP_PRIVATE | MAP_ANONYMOUS,
+ -1, 0);
+ fprintf (stderr, "%s addr=%p", __func__, (void *)addr);
+ fail_unless (addr != MAP_FAILED);
+
+ for (i = 0; i < 40; i++)
+ {
+ p1 = mmap(addr, pagesize, PROT_READ,
+ MAP_PRIVATE | MAP_FIXED,
+ test_fd, 0);
+ p2 = mmap(addr + pagesize, pagesize, PROT_READ,
+ MAP_PRIVATE | MAP_FIXED,
+ test_fd, pagesize);
+ p3 = mmap(addr + pagesize * 2, pagesize, PROT_READ,
+ MAP_PRIVATE | MAP_FIXED,
+ test_fd, pagesize * 2);
+ p4 = mmap(addr + pagesize * 3, pagesize, PROT_READ,
+ MAP_PRIVATE | MAP_FIXED,
+ test_fd, pagesize * 3);
+
+ /* Make sure we get pages aligned with the pagesize.
+ The target expects this. */
+ fail_unless (p1 == (void *)addr);
+ fail_unless (p2 == (void *)addr + pagesize);
+ fail_unless (p3 == (void *)addr + pagesize * 2);
+ fail_unless (p4 == (void *)addr + pagesize * 3);
+
+ /* Verify that the file maps was made correctly. */
+ fail_unless (*p1 == 0);
+ fail_unless (*p2 == (pagesize / sizeof *p2));
+ fail_unless (*p3 == ((pagesize * 2) / sizeof *p3));
+ fail_unless (*p4 == ((pagesize * 3) / sizeof *p4));
+
+ memcpy (dummybuf, p1, pagesize);
+ memcpy (dummybuf, p2, pagesize);
+ memcpy (dummybuf, p3, pagesize);
+ memcpy (dummybuf, p4, pagesize);
+
+ munmap (p1, pagesize);
+ munmap (p2, pagesize);
+ munmap (p3, pagesize);
+ munmap (p4, pagesize);
+ addr += pagesize * 4;
+ }
+ fprintf (stderr, " passed\n");
+}
+
+void checked_write(int fd, const void *buf, size_t count)
+{
+ ssize_t rc = write(fd, buf, count);
+ fail_unless(rc == count);
+}
+
+int main(int argc, char **argv)
+{
+ char tempname[] = "/tmp/.cmmapXXXXXX";
+ unsigned int i;
+
+ /* Trust the first argument, otherwise probe the system for our
+ pagesize. */
+ if (argc > 1)
+ pagesize = strtoul(argv[1], NULL, 0);
+ else
+ pagesize = sysconf(_SC_PAGESIZE);
+
+ /* Assume pagesize is a power of two. */
+ pagemask = pagesize - 1;
+ dummybuf = malloc (pagesize);
+ printf ("pagesize=%u pagemask=%x\n", pagesize, pagemask);
+
+ test_fd = mkstemp(tempname);
+ unlink(tempname);
+
+ /* Fill the file with int's counting from zero and up. */
+ for (i = 0; i < (pagesize * 4) / sizeof i; i++) {
+ checked_write(test_fd, &i, sizeof i);
+ }
+
+ /* Append a few extra writes to make the file end at non
+ page boundary. */
+ checked_write(test_fd, &i, sizeof i); i++;
+ checked_write(test_fd, &i, sizeof i); i++;
+ checked_write(test_fd, &i, sizeof i); i++;
+
+ test_fsize = lseek(test_fd, 0, SEEK_CUR);
+
+ /* Run the tests. */
+ check_aligned_anonymous_unfixed_mmaps();
+ check_aligned_anonymous_unfixed_colliding_mmaps();
+ check_aligned_anonymous_fixed_mmaps();
+ check_file_unfixed_mmaps();
+ check_file_fixed_mmaps();
+ check_file_fixed_eof_mmaps();
+ check_file_unfixed_eof_mmaps();
+
+ /* Fails at the moment. */
+ /* check_aligned_anonymous_fixed_mmaps_collide_with_host(); */
+
+ return EXIT_SUCCESS;
+}
Code Review / kvmfornfv.git / blobdiff