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-rw-r--r--test/mmap/mmap2.c46
1 files changed, 46 insertions, 0 deletions
diff --git a/test/mmap/mmap2.c b/test/mmap/mmap2.c
new file mode 100644
index 000000000..8b94c6199
--- /dev/null
+++ b/test/mmap/mmap2.c
@@ -0,0 +1,46 @@
+/* When trying to map /dev/mem with offset 0xFFFFF000 on the ARM platform, mmap
+ * returns -EOVERFLOW.
+ *
+ * Since off_t is defined as a long int and the sign bit is set in the address,
+ * the shift operation shifts in ones instead of zeroes
+ * from the left. This results the offset sent to the kernel function becomes
+ * 0xFFFFFFFF instead of 0x000FFFFF with MMAP2_PAGE_SHIFT set to 12.
+ */
+
+#include <unistd.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <sys/mman.h>
+
+#define FATAL do { fprintf(stderr, "Error at line %d, file %s (%d) [%s]\n", \
+ __LINE__, __FILE__, errno, strerror(errno)); exit(1); } while(0)
+
+#define MAP_SIZE 4096UL
+#define MAP_MASK (MAP_SIZE - 1)
+
+int main(int argc, char **argv) {
+ void* map_base = 0;
+ int fd;
+ off_t target = 0xfffff000;
+ if((fd = open("/dev/mem", O_RDWR | O_SYNC)) == -1) {
+ /* skip test for non-root users */
+ if (errno == EACCES)
+ return 0;
+ FATAL;
+ }
+ printf("/dev/mem opened.\n");
+ fflush(stdout);
+
+ /* Map one page */
+ map_base = mmap(0, MAP_SIZE, PROT_READ | PROT_WRITE, MAP_SHARED,
+ fd, target & ~MAP_MASK);
+ if(map_base == (void *) -1) FATAL;
+ printf("Memory mapped at address %p.\n", map_base);
+ fflush(stdout);
+ if(munmap(map_base, MAP_SIZE) == -1) FATAL;
+ close(fd);
+ return 0;
+}