1 files changed, 50 insertions, 0 deletions
diff --git a/tests/sys/vm/mmap_map_32bit_helper.c b/tests/sys/vm/mmap_map_32bit_helper.c
new file mode 100644
index 000000000000..763bba35d2b9
--- /dev/null
+++ b/tests/sys/vm/mmap_map_32bit_helper.c
@@ -0,0 +1,50 @@
+/*-
+ * Copyright (c) 2023 Dmitry Chagin <dchagin@FreeBSD.org>
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#include <sys/mman.h>
+
+#include <err.h>
+#include <fcntl.h>
+#include <stdlib.h>
+#include <unistd.h>
+
+#define MAP_32BIT_MAX_ADDR      ((vm_offset_t)1 << 31)
+
+int
+main(void)
+{
+	size_t pagesize;
+	void *s32;
+	int fd;
+
+	if ((pagesize = getpagesize()) <= 0)
+		err(1, "getpagesize");
+
+	fd = open("/dev/zero", O_RDONLY);
+	if (fd <= 0)
+		err(1, "open failed");
+
+	s32 = mmap(NULL, pagesize, PROT_READ, MAP_32BIT | MAP_PRIVATE, fd, 0);
+	if (s32 == MAP_FAILED)
+		err(1, "mmap MAP_32BIT | MAP_PRIVATE failed");
+	if (((vm_offset_t)s32 + pagesize) > MAP_32BIT_MAX_ADDR)
+		errx(1, "mmap invalid result %p", s32);
+
+	close(fd);
+	if (munmap(s32, pagesize) != 0)
+		err(1, "munmap failed");
+
+	s32 = mmap(NULL, pagesize, PROT_READ | PROT_WRITE,
+	    MAP_32BIT | MAP_ANONYMOUS | MAP_PRIVATE, -1, 0);
+	if (s32 == MAP_FAILED)
+		err(1, "mmap MAP_32BIT | MAP_ANONYMOUS | MAP_PRIVATE failed");
+	if (((vm_offset_t)s32 + pagesize) > MAP_32BIT_MAX_ADDR)
+		errx(1, "mmap invalid result %p", s32);
+
+	if (munmap(s32, pagesize) != 0)
+		err(1, "munmap failed");
+	exit(0);
+}