sandbox: Try to start the RAM buffer at a particular address

Use a starting address of 256MB which should be available. This helps to make sandbox RAM buffers pointers more recognisable. Signed-off-by: Simon Glass <[email protected]>
imaami · Nov 14, 2018 · bd8b745 · bd8b745
1 parent 205dd5a
commit bd8b745
Showing 1 changed file with 6 additions and 1 deletion.
diff --git a/arch/sandbox/cpu/os.c b/arch/sandbox/cpu/os.c
@@ -174,7 +174,12 @@ void *os_malloc(size_t length)
 	struct os_mem_hdr *hdr;
 	int page_size = getpagesize();
 
-	hdr = mmap(NULL, length + page_size,
+	/*
+	 * Use an address that is hopefully available to us so that pointers
+	 * to this memory are fairly obvious. If we end up with a different
+	 * address, that's fine too.
+	 */
+	hdr = mmap((void *)0x10000000, length + page_size,
 		   PROT_READ | PROT_WRITE | PROT_EXEC,
 		   MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
 	if (hdr == MAP_FAILED)