diff --git a/gdb/corefile.c b/gdb/corefile.c
index 986e4f5..89fcf49 100644
--- a/gdb/corefile.c
+++ b/gdb/corefile.c
@@ -213,7 +213,7 @@ memory_error (int status, CORE_ADDR memaddr)
 /* Same as target_read_memory, but report an error if can't read.  */
 
 void
-read_memory (CORE_ADDR memaddr, gdb_byte *myaddr, int len)
+read_memory (CORE_ADDR memaddr, gdb_byte *myaddr, size_t len)
 {
   int status;
 
@@ -225,7 +225,7 @@ read_memory (CORE_ADDR memaddr, gdb_byte *myaddr, int len)
 /* Same as target_read_stack, but report an error if can't read.  */
 
 void
-read_stack (CORE_ADDR memaddr, gdb_byte *myaddr, int len)
+read_stack (CORE_ADDR memaddr, gdb_byte *myaddr, size_t len)
 {
   int status;
 
@@ -352,7 +352,7 @@ read_memory_typed_address (CORE_ADDR addr, struct type *type)
    write.  */
 void
 write_memory (CORE_ADDR memaddr, 
-	      const bfd_byte *myaddr, int len)
+	      const bfd_byte *myaddr, size_t len)
 {
   int status;
 
diff --git a/gdb/gdbcore.h b/gdb/gdbcore.h
index 776ce9f..9843b1e 100644
--- a/gdb/gdbcore.h
+++ b/gdb/gdbcore.h
@@ -45,11 +45,11 @@ extern void memory_error (int status, CORE_ADDR memaddr);
 
 /* Like target_read_memory, but report an error if can't read.  */
 
-extern void read_memory (CORE_ADDR memaddr, gdb_byte *myaddr, int len);
+extern void read_memory (CORE_ADDR memaddr, gdb_byte *myaddr, size_t len);
 
 /* Like target_read_stack, but report an error if can't read.  */
 
-extern void read_stack (CORE_ADDR memaddr, gdb_byte *myaddr, int len);
+extern void read_stack (CORE_ADDR memaddr, gdb_byte *myaddr, size_t len);
 
 /* Read an integer from debugged memory, given address and number of
    bytes.  */
@@ -83,7 +83,8 @@ CORE_ADDR read_memory_typed_address (CORE_ADDR addr, struct type *type);
    byteswapping, alignment, different sizes for host vs. target types,
    etc.  */
 
-extern void write_memory (CORE_ADDR memaddr, const gdb_byte *myaddr, int len);
+extern void write_memory (CORE_ADDR memaddr, const gdb_byte *myaddr,
+			  size_t len);
 
 /* Store VALUE at ADDR in the inferior as a LEN-byte unsigned integer.  */
 extern void write_memory_unsigned_integer (CORE_ADDR addr, int len,
diff --git a/gdb/remote.c b/gdb/remote.c
index 565de19..80e889f 100644
--- a/gdb/remote.c
+++ b/gdb/remote.c
@@ -6450,7 +6450,7 @@ check_binary_download (CORE_ADDR addr)
 
 static int
 remote_write_bytes_aux (const char *header, CORE_ADDR memaddr,
-			const gdb_byte *myaddr, int len,
+			const gdb_byte *myaddr, size_t len,
 			char packet_format, int use_length)
 {
   struct remote_state *rs = get_remote_state ();
@@ -6611,7 +6611,7 @@ remote_write_bytes_aux (const char *header, CORE_ADDR memaddr,
    error.  Only transfer a single packet.  */
 
 static int
-remote_write_bytes (CORE_ADDR memaddr, const gdb_byte *myaddr, int len)
+remote_write_bytes (CORE_ADDR memaddr, const gdb_byte *myaddr, size_t len)
 {
   char *packet_format = 0;
 
diff --git a/gdb/target.c b/gdb/target.c
index 91b4b47..a074188 100644
--- a/gdb/target.c
+++ b/gdb/target.c
@@ -1772,7 +1772,7 @@ target_read_memory (CORE_ADDR memaddr, gdb_byte *myaddr, size_t len)
    the target's stack.  This may trigger different cache behavior.  */
 
 int
-target_read_stack (CORE_ADDR memaddr, gdb_byte *myaddr, int len)
+target_read_stack (CORE_ADDR memaddr, gdb_byte *myaddr, size_t len)
 {
   /* Dispatch to the topmost target, not the flattened current_target.
      Memory accesses check target->to_has_(all_)memory, and the
@@ -1791,7 +1791,7 @@ target_read_stack (CORE_ADDR memaddr, gdb_byte *myaddr, int len)
    Callers that can deal with partial writes should call target_write.  */
 
 int
-target_write_memory (CORE_ADDR memaddr, const gdb_byte *myaddr, int len)
+target_write_memory (CORE_ADDR memaddr, const gdb_byte *myaddr, size_t len)
 {
   /* Dispatch to the topmost target, not the flattened current_target.
      Memory accesses check target->to_has_(all_)memory, and the
@@ -1810,7 +1810,7 @@ target_write_memory (CORE_ADDR memaddr, const gdb_byte *myaddr, int len)
    should call target_write.  */
 
 int
-target_write_raw_memory (CORE_ADDR memaddr, const gdb_byte *myaddr, int len)
+target_write_raw_memory (CORE_ADDR memaddr, const gdb_byte *myaddr, size_t len)
 {
   /* Dispatch to the topmost target, not the flattened current_target.
      Memory accesses check target->to_has_(all_)memory, and the
diff --git a/gdb/target.h b/gdb/target.h
index f3ef33a..99ce3b7 100644
--- a/gdb/target.h
+++ b/gdb/target.h
@@ -999,13 +999,13 @@ extern int target_read_string (CORE_ADDR, char **, int, int *);
 extern int target_read_memory (CORE_ADDR memaddr, gdb_byte *myaddr,
 			       size_t len);
 
-extern int target_read_stack (CORE_ADDR memaddr, gdb_byte *myaddr, int len);
+extern int target_read_stack (CORE_ADDR memaddr, gdb_byte *myaddr, size_t len);
 
 extern int target_write_memory (CORE_ADDR memaddr, const gdb_byte *myaddr,
-				int len);
+				size_t len);
 
 extern int target_write_raw_memory (CORE_ADDR memaddr, const gdb_byte *myaddr,
-				    int len);
+				    size_t len);
 
 /* Fetches the target's memory map.  If one is found it is sorted
    and returned, after some consistency checking.  Otherwise, NULL
-- 
1.7.7.6