Add a tests for user-mode mmap

git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@4006 c046a42c-6fe2-441c-8c8c-71466251a162

configure

@@ -1244,6 +1244,7 @@ if test "$source_path_used" = "yes" ; then
     DIRS="tests tests/cris slirp audio"
     FILES="Makefile tests/Makefile"
     FILES="$FILES tests/cris/Makefile tests/cris/.gdbinit"
+    FILES="$FILES tests/test-mmap.c"
     for dir in $DIRS ; do
             mkdir -p $dir
     done

tests/Makefile

@@ -51,6 +51,15 @@ ifeq ($(ARCH),i386)
 	@if diff -u test-i386.ref test-i386.out ; then echo "Auto Test OK (no code copy)"; fi
 endif
 
+.PHONY: test-mmap
+test-mmap: test-mmap.c
+	$(CC) $(CFLAGS) -Wall -static -O2 $(LDFLAGS) -o $@ $<
+	-./test-mmap
+	-$(QEMU) ./test-mmap
+	-$(QEMU) -p 8192 ./test-mmap 8192
+	-$(QEMU) -p 16384 ./test-mmap 16384
+	-$(QEMU) -p 32768 ./test-mmap 32768
+
 # generic Linux and CPU test
 linux-test: linux-test.c
 	$(CC) $(CFLAGS) $(LDFLAGS) -o $@ $< -lm

tests/test-mmap.c

+/*
+ * 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 beeing 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, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#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);
+
+		/* 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.  */
+		fail_unless (p3 != MAP_FAILED);
+		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 accessable 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 accessable 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 int *addr;
+	unsigned int *p1, *p2, *p3, *p4;
+	int i;
+
+	/* Find a suitable address to start with.  */
+	addr = mmap(NULL, pagesize * 44 * 3, 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 == addr);
+		fail_unless (p2 == addr + pagesize);
+		fail_unless (p3 == addr + pagesize * 2);
+		fail_unless (p4 == 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 * 3;
+	}
+	fprintf (stderr, " passed\n");
+}
+
+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++)
+		write (test_fd, &i, sizeof i);
+	/* Append a few extra writes to make the file end at non 
+	   page boundary.  */
+	write (test_fd, &i, sizeof i); i++;
+	write (test_fd, &i, sizeof i); i++;
+	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;
+}