Stop remote_read_bytes from handling partial reads itself.

	* remote-fileio.c: Include target.h.
	(remote_fileio_write_bytes): Delete.
	(remote_fileio_func_open, remote_fileio_func_write)
	(remote_fileio_func_rename, remote_fileio_func_unlink): Use
	target_read_memory.
	(remote_fileio_func_stat): Use target_read_memory and
	target_write_memory.
	(remote_fileio_func_gettimeofday): Use target_write_memory.
	(remote_fileio_func_system): Use target_read_memory.
	* remote.c (remote_write_bytes): Make it static.
	(remote_read_bytes): Don't handle partial reads here.
	* remote.h (remote_read_bytes): Delete declaration.

4 files changed, 75 insertions, 115 deletions

diff --git a/gdb/ChangeLog b/gdb/ChangeLog
index 059db18..ecb1724 100644
--- a/gdb/ChangeLog
+++ b/gdb/ChangeLog
@@ -1,5 +1,22 @@
 2011-01-25  Pedro Alves  <pedro@codesourcery.com>
 
+	Stop remote_read_bytes from handling partial reads itself.
+
+	* remote-fileio.c: Include target.h.
+	(remote_fileio_write_bytes): Delete.
+	(remote_fileio_func_open, remote_fileio_func_write)
+	(remote_fileio_func_rename, remote_fileio_func_unlink): Use
+	target_read_memory.
+	(remote_fileio_func_stat): Use target_read_memory and
+	target_write_memory.
+	(remote_fileio_func_gettimeofday): Use target_write_memory.
+	(remote_fileio_func_system): Use target_read_memory.
+	* remote.c (remote_write_bytes): Make it static.
+	(remote_read_bytes): Don't handle partial reads here.
+	* remote.h (remote_read_bytes): Delete declaration.
+
+2011-01-25  Pedro Alves  <pedro@codesourcery.com>
+
 	Simplify XML parsing a bit.
 
 	* xml-support.h (gdb_xml_parse_quick): Declare.
diff --git a/gdb/remote-fileio.c b/gdb/remote-fileio.c
index 4931c45..38d7c7c 100644
--- a/gdb/remote-fileio.c
+++ b/gdb/remote-fileio.c
@@ -30,6 +30,7 @@
 #include "exceptions.h"
 #include "remote-fileio.h"
 #include "event-loop.h"
+#include "target.h"
 
 #include <fcntl.h>
 #include <sys/time.h>
@@ -588,29 +589,11 @@ remote_fileio_return_success (int retcode)
   remote_fileio_reply (retcode, 0);
 }
 
-/* Wrapper function for remote_write_bytes() which has the disadvantage to
-   write only one packet, regardless of the requested number of bytes to
-   transfer.  This wrapper calls remote_write_bytes() as often as needed.  */
-static int
-remote_fileio_write_bytes (CORE_ADDR memaddr, gdb_byte *myaddr, int len)
-{
-  int ret = 0, written;
-
-  while (len > 0 && (written = remote_write_bytes (memaddr, myaddr, len)) > 0)
-    {
-      len -= written;
-      memaddr += written;
-      myaddr += written;
-      ret += written;
-    }
-  return ret;
-}
-
 static void
 remote_fileio_func_open (char *buf)
 {
   CORE_ADDR ptrval;
-  int length, retlength;
+  int length;
   long num;
   int flags, fd;
   mode_t mode;
@@ -638,10 +621,9 @@ remote_fileio_func_open (char *buf)
     }
   mode = remote_fileio_mode_to_host (num, 1);
 
-  /* Request pathname using 'm' packet.  */
+  /* Request pathname.  */
   pathname = alloca (length);
-  retlength = remote_read_bytes (ptrval, (gdb_byte *) pathname, length);
-  if (retlength != length)
+  if (target_read_memory (ptrval, (gdb_byte *) pathname, length) != 0)
     {
       remote_fileio_ioerror ();
       return;
@@ -819,10 +801,9 @@ remote_fileio_func_read (char *buf)
 
   if (ret > 0)
     {
-      retlength = remote_fileio_write_bytes (ptrval, buffer, ret);
-      if (retlength != ret)
-	ret = -1; /* errno has been set to EIO in
-		     remote_fileio_write_bytes().  */
+      errno = target_write_memory (ptrval, buffer, ret);
+      if (errno != 0)
+	ret = -1;
     }
 
   if (ret < 0)
@@ -839,7 +820,7 @@ remote_fileio_func_write (char *buf)
   long target_fd, num;
   LONGEST lnum;
   CORE_ADDR ptrval;
-  int fd, ret, retlength;
+  int fd, ret;
   gdb_byte *buffer;
   size_t length;
 
@@ -871,8 +852,7 @@ remote_fileio_func_write (char *buf)
   length = (size_t) num;
     
   buffer = (gdb_byte *) xmalloc (length);
-  retlength = remote_read_bytes (ptrval, buffer, length);
-  if (retlength != length)
+  if (target_read_memory (ptrval, buffer, length) != 0)
     {
       xfree (buffer);
       remote_fileio_ioerror ();
@@ -966,7 +946,7 @@ static void
 remote_fileio_func_rename (char *buf)
 {
   CORE_ADDR old_ptr, new_ptr;
-  int old_len, new_len, retlength;
+  int old_len, new_len;
   char *oldpath, *newpath;
   int ret, of, nf;
   struct stat ost, nst;
@@ -987,8 +967,7 @@ remote_fileio_func_rename (char *buf)
   
   /* Request oldpath using 'm' packet */
   oldpath = alloca (old_len);
-  retlength = remote_read_bytes (old_ptr, (gdb_byte *) oldpath, old_len);
-  if (retlength != old_len)
+  if (target_read_memory (old_ptr, (gdb_byte *) oldpath, old_len) != 0)
     {
       remote_fileio_ioerror ();
       return;
@@ -996,8 +975,7 @@ remote_fileio_func_rename (char *buf)
   
   /* Request newpath using 'm' packet */
   newpath = alloca (new_len);
-  retlength = remote_read_bytes (new_ptr, (gdb_byte *) newpath, new_len);
-  if (retlength != new_len)
+  if (target_read_memory (new_ptr, (gdb_byte *) newpath, new_len) != 0)
     {
       remote_fileio_ioerror ();
       return;
@@ -1062,7 +1040,7 @@ static void
 remote_fileio_func_unlink (char *buf)
 {
   CORE_ADDR ptrval;
-  int length, retlength;
+  int length;
   char *pathname;
   int ret;
   struct stat st;
@@ -1075,8 +1053,7 @@ remote_fileio_func_unlink (char *buf)
     }
   /* Request pathname using 'm' packet */
   pathname = alloca (length);
-  retlength = remote_read_bytes (ptrval, (gdb_byte *) pathname, length);
-  if (retlength != length)
+  if (target_read_memory (ptrval, (gdb_byte *) pathname, length) != 0)
     {
       remote_fileio_ioerror ();
       return;
@@ -1103,7 +1080,7 @@ static void
 remote_fileio_func_stat (char *buf)
 {
   CORE_ADDR statptr, nameptr;
-  int ret, namelength, retlength;
+  int ret, namelength;
   char *pathname;
   LONGEST lnum;
   struct stat st;
@@ -1126,8 +1103,7 @@ remote_fileio_func_stat (char *buf)
   
   /* Request pathname using 'm' packet */
   pathname = alloca (namelength);
-  retlength = remote_read_bytes (nameptr, (gdb_byte *) pathname, namelength);
-  if (retlength != namelength)
+  if (target_read_memory (nameptr, (gdb_byte *) pathname, namelength) != 0)
     {
       remote_fileio_ioerror ();
       return;
@@ -1151,10 +1127,9 @@ remote_fileio_func_stat (char *buf)
     {
       remote_fileio_to_fio_stat (&st, &fst);
       remote_fileio_to_fio_uint (0, fst.fst_dev);
-      
-      retlength = remote_fileio_write_bytes (statptr,
-					     (gdb_byte *) &fst, sizeof fst);
-      if (retlength != sizeof fst)
+
+      errno = target_write_memory (statptr, (gdb_byte *) &fst, sizeof fst);
+      if (errno != 0)
 	{
 	  remote_fileio_return_errno (-1);
 	  return;
@@ -1236,9 +1211,8 @@ remote_fileio_func_fstat (char *buf)
     {
       remote_fileio_to_fio_stat (&st, &fst);
 
-      retlength = remote_fileio_write_bytes (ptrval, (gdb_byte *) &fst,
-					     sizeof fst);
-      if (retlength != sizeof fst)
+      errno = target_write_memory (ptrval, (gdb_byte *) &fst, sizeof fst);
+      if (errno != 0)
 	{
 	  remote_fileio_return_errno (-1);
 	  return;
@@ -1289,9 +1263,8 @@ remote_fileio_func_gettimeofday (char *buf)
     {
       remote_fileio_to_fio_timeval (&tv, &ftv);
 
-      retlength = remote_fileio_write_bytes (ptrval, (gdb_byte *) &ftv,
-					     sizeof ftv);
-      if (retlength != sizeof ftv)
+      errno = target_write_memory (ptrval, (gdb_byte *) &ftv, sizeof ftv);
+      if (errno != 0)
 	{
 	  remote_fileio_return_errno (-1);
 	  return;
@@ -1336,8 +1309,7 @@ remote_fileio_func_system (char *buf)
     {
       /* Request commandline using 'm' packet */
       cmdline = alloca (length);
-      retlength = remote_read_bytes (ptrval, (gdb_byte *) cmdline, length);
-      if (retlength != length)
+      if (target_read_memory (ptrval, (gdb_byte *) cmdline, length) != 0)
 	{
 	  remote_fileio_ioerror ();
 	  return;
diff --git a/gdb/remote.c b/gdb/remote.c
index 48d9d55..b440e9e 100644
--- a/gdb/remote.c
+++ b/gdb/remote.c
@@ -6356,7 +6356,7 @@ remote_write_bytes_aux (const char *header, CORE_ADDR memaddr,
    Returns number of bytes transferred, or 0 (setting errno) for
    error.  Only transfer a single packet.  */
 
-int
+static int
 remote_write_bytes (CORE_ADDR memaddr, const gdb_byte *myaddr, int len)
 {
   char *packet_format = 0;
@@ -6391,19 +6391,14 @@ remote_write_bytes (CORE_ADDR memaddr, const gdb_byte *myaddr, int len)
 
    Returns number of bytes transferred, or 0 for error.  */
 
-/* NOTE: cagney/1999-10-18: This function (and its siblings in other
-   remote targets) shouldn't attempt to read the entire buffer.
-   Instead it should read a single packet worth of data and then
-   return the byte size of that packet to the caller.  The caller (its
-   caller and its callers caller ;-) already contains code for
-   handling partial reads.  */
-
-int
+static int
 remote_read_bytes (CORE_ADDR memaddr, gdb_byte *myaddr, int len)
 {
   struct remote_state *rs = get_remote_state ();
   int max_buf_size;		/* Max size of packet output buffer.  */
-  int origlen;
+  char *p;
+  int todo;
+  int i;
 
   if (len <= 0)
     return 0;
@@ -6412,56 +6407,37 @@ remote_read_bytes (CORE_ADDR memaddr, gdb_byte *myaddr, int len)
   /* The packet buffer will be large enough for the payload;
      get_memory_packet_size ensures this.  */
 
-  origlen = len;
-  while (len > 0)
-    {
-      char *p;
-      int todo;
-      int i;
+  /* Number if bytes that will fit.  */
+  todo = min (len, max_buf_size / 2);
 
-      todo = min (len, max_buf_size / 2);	/* num bytes that will fit.  */
-
-      /* construct "m"<memaddr>","<len>" */
-      /* sprintf (rs->buf, "m%lx,%x", (unsigned long) memaddr, todo); */
-      memaddr = remote_address_masked (memaddr);
-      p = rs->buf;
-      *p++ = 'm';
-      p += hexnumstr (p, (ULONGEST) memaddr);
-      *p++ = ',';
-      p += hexnumstr (p, (ULONGEST) todo);
-      *p = '\0';
-
-      putpkt (rs->buf);
-      getpkt (&rs->buf, &rs->buf_size, 0);
-
-      if (rs->buf[0] == 'E'
-	  && isxdigit (rs->buf[1]) && isxdigit (rs->buf[2])
-	  && rs->buf[3] == '\0')
-	{
-	  /* There is no correspondance between what the remote
-	     protocol uses for errors and errno codes.  We would like
-	     a cleaner way of representing errors (big enough to
-	     include errno codes, bfd_error codes, and others).  But
-	     for now just return EIO.  */
-	  errno = EIO;
-	  return 0;
-	}
-
-      /* Reply describes memory byte by byte,
-         each byte encoded as two hex characters.  */
-
-      p = rs->buf;
-      if ((i = hex2bin (p, myaddr, todo)) < todo)
-	{
-	  /* Reply is short.  This means that we were able to read
-	     only part of what we wanted to.  */
-	  return i + (origlen - len);
-	}
-      myaddr += todo;
-      memaddr += todo;
-      len -= todo;
+  /* Construct "m"<memaddr>","<len>".  */
+  memaddr = remote_address_masked (memaddr);
+  p = rs->buf;
+  *p++ = 'm';
+  p += hexnumstr (p, (ULONGEST) memaddr);
+  *p++ = ',';
+  p += hexnumstr (p, (ULONGEST) todo);
+  *p = '\0';
+  putpkt (rs->buf);
+  getpkt (&rs->buf, &rs->buf_size, 0);
+  if (rs->buf[0] == 'E'
+      && isxdigit (rs->buf[1]) && isxdigit (rs->buf[2])
+      && rs->buf[3] == '\0')
+    {
+      /* There is no correspondance between what the remote protocol
+	 uses for errors and errno codes.  We would like a cleaner way
+	 of representing errors (big enough to include errno codes,
+	 bfd_error codes, and others).  But for now just return
+	 EIO.  */
+      errno = EIO;
+      return 0;
     }
-  return origlen;
+  /* Reply describes memory byte by byte, each byte encoded as two hex
+     characters.  */
+  p = rs->buf;
+  i = hex2bin (p, myaddr, todo);
+  /* Return what we have.  Let higher layers handle partial reads.  */
+  return i;
 }
 
 
diff --git a/gdb/remote.h b/gdb/remote.h
index 5327947..25f5ccc 100644
--- a/gdb/remote.h
+++ b/gdb/remote.h
@@ -42,11 +42,6 @@ extern char *unpack_varlen_hex (char *buff, ULONGEST *result);
 
 extern void async_remote_interrupt_twice (void *arg);
 
-extern int remote_write_bytes (CORE_ADDR memaddr, const gdb_byte *myaddr,
-			       int len);
-
-extern int remote_read_bytes (CORE_ADDR memaddr, gdb_byte *myaddr, int len);
-
 void register_remote_g_packet_guess (struct gdbarch *gdbarch, int bytes,
 				     const struct target_desc *tdesc);
 void register_remote_support_xml (const char *);