remote-sim.c: cleanup debug output code.

Manually tested with a --target=arm-eabi build, and doing

$ arm-eabi-gcc ~/gdb/tests/main.c -o a.out -c -g
$ ./gdb a.out
...
(gdb) tar sim
(gdb) load
(gdb) set debug remote 1
(gdb) disassemble 0
Dump of assembler code for function main:
gdbsim_xfer_inferior_memory: myaddr 0x7fffffffd400, memaddr 0x0, len 4, write 0
   0x00000000 <+0>:             0xe1a0c00d
mov     r12, sp
gdbsim_xfer_inferior_memory: myaddr 0x7fffffffd400, memaddr 0x4, len 4, write 0
   0x00000004 <+4>:             0xe92dd800
push    {r11, r12, lr, pc}
gdbsim_xfer_inferior_memory: myaddr 0x7fffffffd400, memaddr 0x8, len 4, write 0
   0x00000008 <+8>:             0xe24cb004
sub     r11, r12, #4
gdbsim_xfer_inferior_memory: myaddr 0x7fffffffd400, memaddr 0xc, len 4, write 0
   0x0000000c <+12>:            0xe24dd008
sub     sp, sp, #8
gdbsim_xfer_inferior_memory: myaddr 0x7fffffffd400, memaddr 0x10, len 4, write 0
   0x00000010 <+16>:            0xe50b0010
str     r0, [r11, #-16]
gdbsim_xfer_inferior_memory: myaddr 0x7fffffffd400, memaddr 0x14, len 4, write 0
   0x00000014 <+20>:            0xe50b1014
str     r1, [r11, #-20]
gdbsim_xfer_inferior_memory: myaddr 0x7fffffffd400, memaddr 0x18, len 4, write 0
   0x00000018 <+24>:            0xe3a03000
mov     r3, #0
gdbsim_xfer_inferior_memory: myaddr 0x7fffffffd400, memaddr 0x1c, len 4, write 0
   0x0000001c <+28>:            0xe1a00003
mov     r0, r3
gdbsim_xfer_inferior_memory: myaddr 0x7fffffffd400, memaddr 0x20, len 4, write 0
   0x00000020 <+32>:            0xe24bd00c
sub     sp, r11, #12
gdbsim_xfer_inferior_memory: myaddr 0x7fffffffd400, memaddr 0x24, len 4, write 0
   0x00000024 <+36>:            0xe89da800
ldm     sp, {r11, sp, pc}
End of assembler dump.
(gdb) p *0 = 1
gdbsim_xfer_inferior_memory: myaddr 0xc69bc0, memaddr 0x0, len 4, write 1
        0x00000001
$1 = 1

Which happens to differ from before, I think due to stdout line buffering:

(gdb) disassemble 0
Dump of assembler code for function main:
   0x00000000 <+0>:     gdbsim_xfer_inferior_memory: myaddr 0x0x7fffffffd400, memaddr 0x0, len 4, write 0
        0xe1a0c00d

But the new output looks reasonable to me, better even.

gdb/
2013-09-06  Pedro Alves  <palves@redhat.com>

	* remote-sim.c (gdbsim_xfer_inferior_memory): Use
	host_address_to_string, and send debug output to gdb_stdlog.

1 files changed, 8 insertions, 9 deletions

diff --git a/gdb/remote-sim.c b/gdb/remote-sim.c
index d534e56..49e2581 100644
--- a/gdb/remote-sim.c
+++ b/gdb/remote-sim.c
@@ -1086,18 +1086,17 @@ gdbsim_xfer_inferior_memory (CORE_ADDR memaddr, gdb_byte *myaddr, int len,
   gdb_assert (sim_data->gdbsim_desc != NULL);
 
   if (remote_debug)
-    {
-      /* FIXME: Send to something other than STDOUT?  */
-      printf_filtered ("gdbsim_xfer_inferior_memory: myaddr 0x");
-      gdb_print_host_address (myaddr, gdb_stdout);
-      printf_filtered (", memaddr %s, len %d, write %d\n",
-		       paddress (target_gdbarch (), memaddr), len, write);
-      if (remote_debug && write)
-	dump_mem (myaddr, len);
-    }
+    fprintf_unfiltered (gdb_stdlog,
+			"gdbsim_xfer_inferior_memory: myaddr %s, "
+			"memaddr %s, len %d, write %d\n",
+			host_address_to_string (myaddr),
+			paddress (target_gdbarch (), memaddr),
+			len, write);
 
   if (write)
     {
+      if (remote_debug && len > 0)
+	dump_mem (myaddr, len);
       len = sim_write (sim_data->gdbsim_desc, memaddr, myaddr, len);
     }
   else