[PATCH] MIPS: Ignore invalid regs during info registers all

[James Hogan <james.hogan@imgtec.com>]

The "info registers all" command causes mips_print_registers_info () to be
called for all register numbers, including invalid ones such as unused DSP
register numbers. This triggers an error () call which prevents further
register values being printed. Just silently return without printing
anything or erroring, so that all valid registers can be printed.

For example, before this patch:
  (gdb) info registers all
  zero: 0x0
  ...
  fir: 0x30f30320
  Not a valid register for the current processor type
  (gdb)

After this patch:
  (gdb) info registers all
  zero: 0x0
  ...
  fir: 0x30f30320
  restart: 0x0
  (gdb)

gdb/ChangeLog:

	* mips-tdep.c (mips_print_registers_info): Replace error for
	single invalid register with silent return.
---
 gdb/ChangeLog   | 5 +++++
 gdb/mips-tdep.c | 2 +-
 2 files changed, 6 insertions(+), 1 deletion(-)

diff --git a/gdb/ChangeLog b/gdb/ChangeLog
index f3282144c303..5da8415c3ca0 100644
--- a/gdb/ChangeLog
+++ b/gdb/ChangeLog
@@ -1,3 +1,8 @@
+2014-09-30  James Hogan  <james.hogan@imgtec.com>
+
+	* mips-tdep.c (mips_print_registers_info): Replace error for
+	single invalid register with silent return.
+
 2014-09-30  Andreas Arnez  <arnez@linux.vnet.ibm.com>
 
 	* gdbarch.sh (regset_from_core_section): Remove gdbarch method.
diff --git a/gdb/mips-tdep.c b/gdb/mips-tdep.c
index 188580f2ebdc..3c4665457552 100644
--- a/gdb/mips-tdep.c
+++ b/gdb/mips-tdep.c
@@ -6332,7 +6332,7 @@ mips_print_registers_info (struct gdbarch *gdbarch, struct ui_file *file,
     {
       gdb_assert (regnum >= gdbarch_num_regs (gdbarch));
       if (*(gdbarch_register_name (gdbarch, regnum)) == '\0')
-	error (_("Not a valid register for the current processor type"));
+	return;
 
       mips_print_register (file, frame, regnum);
       fprintf_filtered (file, "\n");
-- 
1.8.5.5