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FRV: Reinstate null behaviour for the GDB remote protocol 'p' command

Reinstate the null behaviour that the in-kernel gdbstub had for the GDB
remote protocol 'p' command (retrieve a single register value) prior to
commit 7ca8b9c ("frv: extend gdbstub to support more features of

Before that, the 'p' command just returned an empty reply, which causes
gdb to then go and use the 'g' command.  However, since that commit, the
'p' command returns an error string, which causes gdb to abort its
connection to the target.

Not all gdb versions are affected, some use try 'g' first, and if that
works, don't bother with 'p', and so don't see the error.

Signed-off-by: David Howells <>
Signed-off-by: Linus Torvalds <>
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1 parent 9aad9c0 commit a7f5378e2449fc8ae3f92739a6cc2239748ef86a David Howells committed with torvalds Jun 9, 2010
Showing with 6 additions and 0 deletions.
  1. +6 −0 arch/frv/kernel/gdb-stub.c
6 arch/frv/kernel/gdb-stub.c
@@ -1789,6 +1789,12 @@ void gdbstub(int sigval)
flush_cache = 1;
+ /* pNN: Read value of reg N and return it */
+ case 'p':
+ /* return no value, indicating that we don't support
+ * this command and that gdb should use 'g' instead */
+ break;
/* PNN,=RRRRRRRR: Write value R to reg N return OK */
case 'P':
ptr = &input_buffer[1];

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