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[Qemu-devel] [PATCH] Small testsuite for mmap.
From: |
Edgar E. Iglesias |
Subject: |
[Qemu-devel] [PATCH] Small testsuite for mmap. |
Date: |
Sat, 16 Feb 2008 21:21:08 +0100 |
User-agent: |
Mutt/1.5.16 (2007-06-09) |
Hello,
This patch adds a small test program to help verify mmap behaviour, at the
moment it only does some very basic tests. Unfortunately, current qemu fails
to pass. I'll send a patch for that in a moment.
Best regards,
--
Edgar E. Iglesias
Axis Communications AB
diff --git a/tests/Makefile b/tests/Makefile
index 1775be8..6000c73 100644
--- a/tests/Makefile
+++ b/tests/Makefile
@@ -51,6 +51,12 @@ 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 $@ $<
+ $(QEMU) ./test-mmap
+ $(QEMU) -p 8192 ./test-mmap 8192
+
# generic Linux and CPU test
linux-test: linux-test.c
$(CC) $(CFLAGS) $(LDFLAGS) -o $@ $< -lm
diff --git a/tests/test-mmap.c b/tests/test-mmap.c
new file mode 100644
index 0000000..3711115
--- /dev/null
+++ b/tests/test-mmap.c
@@ -0,0 +1,171 @@
+/*
+ * 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 cause getpagesize will not reflect the
+ * -p choice. Simply pass one argument beeing the pagesize.
+ */
+#include <stdio.h>
+#include <stdlib.h>
+#include <stdint.h>
+#include <unistd.h>
+
+#include <sys/mman.h>
+
+#define fail_unless(x) \
+do \
+{ \
+ if (!(x)) { \
+ fprintf (stderr, "FAILED at %s:%d\n", __FILE__, __LINE__); \
+ exit (EXIT_FAILURE); \
+ } \
+} while (0);
+
+
+static unsigned int pagesize;
+static unsigned int pagemask;
+int test_fd;
+
+void check_aligned_anonymous_unfixed_mmaps(void)
+{
+ void *p1;
+ void *p2;
+ void *p3;
+ uintptr_t p;
+ int i;
+
+ printf ("%s\n", __func__);
+ for (i = 0; i < 0xffff; 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);
+
+ /* 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);
+ 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);
+ munmap (p1, len);
+ munmap (p2, len);
+ munmap (p3, len);
+ }
+}
+
+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,
+ MAP_PRIVATE | MAP_ANONYMOUS,
+ -1, 0);
+ printf ("%s addr=%p\n", __func__, addr);
+ fail_unless (addr != MAP_FAILED);
+
+ for (i = 0; i < 40; i++)
+ {
+ 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 != MAP_FAILED);
+ fail_unless ((p & pagemask) == 0);
+ munmap (p1, pagesize);
+ addr += pagesize;
+ }
+}
+
+void check_file_unfixed_mmaps(void)
+{
+ unsigned int *p1, *p2, *p3;
+ uintptr_t p;
+ int i;
+
+ printf ("%s\n", __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. */
+ fail_unless (*p1 == 0);
+ fail_unless (*p2 == (pagesize / sizeof *p2));
+ fail_unless (*p3 == ((pagesize * 2) / sizeof *p3));
+
+ munmap (p1, len);
+ munmap (p2, len);
+ munmap (p3, len);
+ }
+}
+
+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;
+ 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);
+
+ /* Run the tests. */
+ check_aligned_anonymous_unfixed_mmaps();
+ check_aligned_anonymous_fixed_mmaps();
+ check_file_unfixed_mmaps();
+
+ return EXIT_SUCCESS;
+}
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