[PATCH 4/7] nto-procfs.c: Don't install a deprecated_xfer_memory method

[Pedro Alves <palves at redhat dot com>]

This removes yet another instance of a deprecated_xfer_memory user.

I have no way to test this.

gdb/
2014-02-19  Pedro Alves  <palves@redhat.com>

	* nto-procfs.c (procfs_xfer_memory): Adjust interface as a
	to_xfer_partial helper.  Rewrite.
	(procfs_xfer_partial): New function.
	(init_procfs_ops): Don't install a deprecated_xfer_memory hook.
	Install a to_xfer_partial hook.
---
 gdb/nto-procfs.c | 58 +++++++++++++++++++++++++++++++++-----------------------
 1 file changed, 34 insertions(+), 24 deletions(-)

diff --git a/gdb/nto-procfs.c b/gdb/nto-procfs.c
index d0bdc90..bdda7ce 100644
--- a/gdb/nto-procfs.c
+++ b/gdb/nto-procfs.c
@@ -59,10 +59,6 @@ static void procfs_open (char *, int);
 
 static int procfs_can_run (struct target_ops *self);
 
-static int procfs_xfer_memory (CORE_ADDR, gdb_byte *, int, int,
-			       struct mem_attrib *attrib,
-			       struct target_ops *);
-
 static void init_procfs_ops (void);
 
 static ptid_t do_attach (ptid_t ptid);
@@ -849,30 +845,44 @@ procfs_fetch_registers (struct target_ops *ops,
     nto_supply_altregset (regcache, (char *) &reg.altreg);
 }
 
-/* Copy LEN bytes to/from inferior's memory starting at MEMADDR
-   from/to debugger memory starting at MYADDR.  Copy from inferior
-   if DOWRITE is zero or to inferior if DOWRITE is nonzero.
+/* Helper for procfs_xfer_partial that handles memory transfers.
+   Arguments are like target_xfer_partial.  */
 
-   Returns the length copied, which is either the LEN argument or
-   zero.  This xfer function does not do partial moves, since procfs_ops
-   doesn't allow memory operations to cross below us in the target stack
-   anyway.  */
-static int
-procfs_xfer_memory (CORE_ADDR memaddr, gdb_byte *myaddr, int len, int dowrite,
-		    struct mem_attrib *attrib, struct target_ops *target)
+static enum target_xfer_status
+procfs_xfer_memory (gdb_byte *readbuf, const gdb_byte *writebuf,
+		    ULONGEST memaddr, ULONGEST len, ULONGEST *xfered_len)
 {
-  int nbytes = 0;
+  int nbytes;
+
+  if (lseek (ctl_fd, (off_t) memaddr, SEEK_SET) != (off_t) memaddr)
+    return TARGET_XFER_E_IO;
+
+  if (writebuf != NULL)
+    nbytes = write (ctl_fd, writebuf, len);
+  else
+    nbytes = read (ctl_fd, readbuf, len);
+  if (nbytes <= 0)
+    return TARGET_XFER_E_IO;
+  *xfered_len = nbytes;
+  return TARGET_XFER_OK;
+}
+
+/* Target to_xfer_partial implementation.  */
 
-  if (lseek (ctl_fd, (off_t) memaddr, SEEK_SET) == (off_t) memaddr)
+static enum target_xfer_status
+procfs_xfer_partial (struct target_ops *ops, enum target_object object,
+		     const char *annex, gdb_byte *readbuf,
+		     const gdb_byte *writebuf, ULONGEST offset, ULONGEST len,
+		     ULONGEST *xfered_len)
+{
+  switch (object)
     {
-      if (dowrite)
-	nbytes = write (ctl_fd, myaddr, len);
-      else
-	nbytes = read (ctl_fd, myaddr, len);
-      if (nbytes < 0)
-	nbytes = 0;
+    case TARGET_OBJECT_MEMORY:
+      return procfs_xfer_memory (readbuf, writebuf, offset, len, xfered_len);
+    default:
+      return ops->beneath->to_xfer_partial (ops->beneath, object, annex,
+					    readbuf, writebuf, offset, len);
     }
-  return (nbytes);
 }
 
 /* Take a program previously attached to and detaches it.
@@ -1397,7 +1407,7 @@ init_procfs_ops (void)
   procfs_ops.to_fetch_registers = procfs_fetch_registers;
   procfs_ops.to_store_registers = procfs_store_registers;
   procfs_ops.to_prepare_to_store = procfs_prepare_to_store;
-  procfs_ops.deprecated_xfer_memory = procfs_xfer_memory;
+  procfs_ops.to_xfer_partial = procfs_xfer_partial;
   procfs_ops.to_files_info = procfs_files_info;
   procfs_ops.to_insert_breakpoint = procfs_insert_breakpoint;
   procfs_ops.to_remove_breakpoint = procfs_remove_breakpoint;
-- 
1.7.11.7