tests/tcg/multiarch/test-mmap: Check mmaps beyond reserved_va

Unfixed mmap calls where start > reserved_va or the max guest addr
should have a valid result.

Signed-off-by: Bingwu Zhang <xtex@astrafall.org>
Signed-off-by: Helge Deller <deller@gmx.de>

tests/tcg/multiarch/test-mmap.c

@@ -497,6 +497,20 @@ void check_shrink_mmaps(void)
     fprintf(stdout, " passed\n");
 }
 
+void check_mmaps_beyond_addr_space(void)
+{
+    unsigned char *addr;
+    addr = mmap((void *)(-(unsigned long)pagesize * 10), pagesize * 2,
+                PROT_READ, MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
+    fprintf(stdout, "%s addr=%p errno=%d", __func__, (void *)addr, errno);
+    fail_unless(addr != MAP_FAILED);
+
+    memcpy(dummybuf, addr, 2 * pagesize);
+    munmap(addr, 2 * pagesize);
+
+    fprintf(stdout, " passed\n");
+}
+
 int main(int argc, char **argv)
 {
 	char tempname[] = "/tmp/.cmmapXXXXXX";
@@ -540,6 +554,7 @@ int main(int argc, char **argv)
 	check_file_unfixed_eof_mmaps();
 	check_invalid_mmaps();
     check_shrink_mmaps();
+    check_mmaps_beyond_addr_space();
 
 	/* Fails at the moment.  */
 	/* check_aligned_anonymous_fixed_mmaps_collide_with_host(); */