/* Read memory. */
-int
-sim_read (SIM_DESC sd, SIM_ADDR mem, void *buf, int length)
+uint64_t
+sim_read (SIM_DESC sd, uint64_t mem, void *buf, uint64_t length)
{
check_desc (sd);
/* Write memory. */
-int
-sim_write (SIM_DESC sd, SIM_ADDR mem, const void *buf, int length)
+uint64_t
+sim_write (SIM_DESC sd, uint64_t mem, const void *buf, uint64_t length)
{
check_desc (sd);