diff --git a/include/sim/sim.h b/include/sim/sim.h
index 251a1d46310..5dfb28b6785 100644
--- a/include/sim/sim.h
+++ b/include/sim/sim.h
@@ -160,14 +160,14 @@ SIM_RC sim_create_inferior (SIM_DESC sd, struct bfd *abfd,
    at virtual address MEM and store in BUF.  Result is number of bytes
    read, or zero if error.  */
 
-uint64_t sim_read (SIM_DESC sd, uint64_t mem, void *buf, uint64_t length);
+uint64_t sim_read (SIM_DESC sd, uint64_t addr, void *buf, uint64_t length);
 
 
 /* Store LENGTH bytes from BUF into the simulated program's
    memory. Store bytes starting at virtual address MEM. Result is
    number of bytes write, or zero if error.  */
 
-uint64_t sim_write (SIM_DESC sd, uint64_t mem, const void *buf, uint64_t length);
+uint64_t sim_write (SIM_DESC sd, uint64_t addr, const void *buf, uint64_t length);
 
 
 /* Fetch register REGNO storing its raw (target endian) value in the
diff --git a/sim/common/sim-hrw.c b/sim/common/sim-hrw.c
index 757b826cc63..582d391ae1a 100644
--- a/sim/common/sim-hrw.c
+++ b/sim/common/sim-hrw.c
@@ -27,17 +27,17 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
    modeling real hardware */
 
 uint64_t
-sim_read (SIM_DESC sd, uint64_t mem, void *buffer, uint64_t length)
+sim_read (SIM_DESC sd, uint64_t addr, void *buffer, uint64_t length)
 {
   SIM_ASSERT (STATE_MAGIC (sd) == SIM_MAGIC_NUMBER);
   return sim_core_read_buffer (sd, NULL, read_map,
-			       buffer, mem, length);
+			       buffer, addr, length);
 }
 
 uint64_t
-sim_write (SIM_DESC sd, uint64_t mem, const void *buffer, uint64_t length)
+sim_write (SIM_DESC sd, uint64_t addr, const void *buffer, uint64_t length)
 {
   SIM_ASSERT (STATE_MAGIC (sd) == SIM_MAGIC_NUMBER);
   return sim_core_write_buffer (sd, NULL, write_map,
-				buffer, mem, length);
+				buffer, addr, length);
 }
diff --git a/sim/erc32/interf.c b/sim/erc32/interf.c
index 1f2660771f8..98b8a65b944 100644
--- a/sim/erc32/interf.c
+++ b/sim/erc32/interf.c
@@ -330,25 +330,25 @@ sim_fetch_register(SIM_DESC sd, int regno, void *buf, int length)
 }
 
 uint64_t
-sim_write (SIM_DESC sd, uint64_t mem, const void *buffer, uint64_t length)
+sim_write (SIM_DESC sd, uint64_t addr, const void *buffer, uint64_t length)
 {
     int i;
     const unsigned char *data = buffer;
 
     for (i = 0; i < length; i++) {
-	sis_memory_write ((mem + i) ^ EBT, &data[i], 1);
+	sis_memory_write ((addr + i) ^ EBT, &data[i], 1);
     }
     return length;
 }
 
 uint64_t
-sim_read (SIM_DESC sd, uint64_t mem, void *buffer, uint64_t length)
+sim_read (SIM_DESC sd, uint64_t addr, void *buffer, uint64_t length)
 {
     int i;
     unsigned char *data = buffer;
 
     for (i = 0; i < length; i++) {
-	sis_memory_read ((mem + i) ^ EBT, &data[i], 1);
+	sis_memory_read ((addr + i) ^ EBT, &data[i], 1);
     }
     return length;
 }
diff --git a/sim/m32c/gdb-if.c b/sim/m32c/gdb-if.c
index a1a96b450f3..bf8424e65df 100644
--- a/sim/m32c/gdb-if.c
+++ b/sim/m32c/gdb-if.c
@@ -159,24 +159,24 @@ sim_create_inferior (SIM_DESC sd, struct bfd * abfd,
 }
 
 uint64_t
-sim_read (SIM_DESC sd, uint64_t mem, void *buf, uint64_t length)
+sim_read (SIM_DESC sd, uint64_t addr, void *buf, uint64_t length)
 {
   check_desc (sd);
 
-  if (mem == 0)
+  if (addr == 0)
     return 0;
 
-  mem_get_blk ((int) mem, buf, length);
+  mem_get_blk ((int) addr, buf, length);
 
   return length;
 }
 
 uint64_t
-sim_write (SIM_DESC sd, uint64_t mem, const void *buf, uint64_t length)
+sim_write (SIM_DESC sd, uint64_t addr, const void *buf, uint64_t length)
 {
   check_desc (sd);
 
-  mem_put_blk ((int) mem, buf, length);
+  mem_put_blk ((int) addr, buf, length);
 
   return length;
 }
diff --git a/sim/ppc/sim_calls.c b/sim/ppc/sim_calls.c
index 13e39a6e07b..dc177e45c7a 100644
--- a/sim/ppc/sim_calls.c
+++ b/sim/ppc/sim_calls.c
@@ -125,26 +125,26 @@ sim_load (SIM_DESC sd, const char *prog, bfd *abfd, int from_tty)
 
 
 uint64_t
-sim_read (SIM_DESC sd, uint64_t mem, void *buf, uint64_t length)
+sim_read (SIM_DESC sd, uint64_t addr, void *buf, uint64_t length)
 {
   int result = psim_read_memory(simulator, MAX_NR_PROCESSORS,
-				buf, mem, length);
+				buf, addr, length);
   TRACE(trace_gdb,
-	("sim_read(mem=0x%" PRIx64 ", buf=%p, length=%" PRIx64 ") = %d\n",
-	 mem, buf, length, result));
+	("sim_read(addr=0x%" PRIx64 ", buf=%p, length=%" PRIx64 ") = %d\n",
+	 addr, buf, length, result));
   return result;
 }
 
 
 uint64_t
-sim_write (SIM_DESC sd, uint64_t mem, const void *buf, uint64_t length)
+sim_write (SIM_DESC sd, uint64_t addr, const void *buf, uint64_t length)
 {
   int result = psim_write_memory(simulator, MAX_NR_PROCESSORS,
-				 buf, mem, length,
+				 buf, addr, length,
 				 1/*violate_ro*/);
   TRACE(trace_gdb,
-	("sim_write(mem=0x%" PRIx64 ", buf=%p, length=%" PRIx64 ") = %d\n",
-	 mem, buf, length, result));
+	("sim_write(addr=0x%" PRIx64 ", buf=%p, length=%" PRIx64 ") = %d\n",
+	 addr, buf, length, result));
   return result;
 }
 
diff --git a/sim/rl78/gdb-if.c b/sim/rl78/gdb-if.c
index b85302b40a0..6c0a70beb19 100644
--- a/sim/rl78/gdb-if.c
+++ b/sim/rl78/gdb-if.c
@@ -205,32 +205,32 @@ sim_create_inferior (SIM_DESC sd, struct bfd *abfd,
 /* Read memory.  */
 
 uint64_t
-sim_read (SIM_DESC sd, uint64_t mem, void *buf, uint64_t length)
+sim_read (SIM_DESC sd, uint64_t addr, void *buf, uint64_t length)
 {
   check_desc (sd);
 
-  if (mem >= MEM_SIZE)
+  if (addr >= MEM_SIZE)
     return 0;
-  else if (mem + length > MEM_SIZE)
-    length = MEM_SIZE - mem;
+  else if (addr + length > MEM_SIZE)
+    length = MEM_SIZE - addr;
 
-  mem_get_blk (mem, buf, length);
+  mem_get_blk (addr, buf, length);
   return length;
 }
 
 /* Write memory.  */
 
 uint64_t
-sim_write (SIM_DESC sd, uint64_t mem, const void *buf, uint64_t length)
+sim_write (SIM_DESC sd, uint64_t addr, const void *buf, uint64_t length)
 {
   check_desc (sd);
 
-  if (mem >= MEM_SIZE)
+  if (addr >= MEM_SIZE)
     return 0;
-  else if (mem + length > MEM_SIZE)
-    length = MEM_SIZE - mem;
+  else if (addr + length > MEM_SIZE)
+    length = MEM_SIZE - addr;
 
-  mem_put_blk (mem, buf, length);
+  mem_put_blk (addr, buf, length);
   return length;
 }
 
diff --git a/sim/rx/gdb-if.c b/sim/rx/gdb-if.c
index 6b616b7612a..0fc626d9e9c 100644
--- a/sim/rx/gdb-if.c
+++ b/sim/rx/gdb-if.c
@@ -227,23 +227,23 @@ sim_create_inferior (SIM_DESC sd, struct bfd *abfd,
 }
 
 uint64_t
-sim_read (SIM_DESC sd, uint64_t mem, void *buffer, uint64_t length)
+sim_read (SIM_DESC sd, uint64_t addr, void *buffer, uint64_t length)
 {
   int i;
   unsigned char *data = buffer;
 
   check_desc (sd);
 
-  if (mem == 0)
+  if (addr == 0)
     return 0;
 
   execution_error_clear_last_error ();
 
   for (i = 0; i < length; i++)
     {
-      bfd_vma addr = mem + i;
-      int do_swap = addr_in_swap_list (addr);
-      data[i] = mem_get_qi (addr ^ (do_swap ? 3 : 0));
+      bfd_vma vma = addr + i;
+      int do_swap = addr_in_swap_list (vma);
+      data[i] = mem_get_qi (vma ^ (do_swap ? 3 : 0));
 
       if (execution_error_get_last_error () != SIM_ERR_NONE)
 	return i;
@@ -253,7 +253,7 @@ sim_read (SIM_DESC sd, uint64_t mem, void *buffer, uint64_t length)
 }
 
 uint64_t
-sim_write (SIM_DESC sd, uint64_t mem, const void *buffer, uint64_t length)
+sim_write (SIM_DESC sd, uint64_t addr, const void *buffer, uint64_t length)
 {
   int i;
   const unsigned char *data = buffer;
@@ -264,9 +264,9 @@ sim_write (SIM_DESC sd, uint64_t mem, const void *buffer, uint64_t length)
 
   for (i = 0; i < length; i++)
     {
-      bfd_vma addr = mem + i;
-      int do_swap = addr_in_swap_list (addr);
-      mem_put_qi (addr ^ (do_swap ? 3 : 0), data[i]);
+      bfd_vma vma = addr + i;
+      int do_swap = addr_in_swap_list (vma);
+      mem_put_qi (vma ^ (do_swap ? 3 : 0), data[i]);
 
       if (execution_error_get_last_error () != SIM_ERR_NONE)
 	return i;