From: Balbir Singh <bsingharora@gmail.com>
Date: Mon, 1 Feb 2016 06:03:25 +0000 (+1100)
Subject: powerpc: Fix kgdb on little endian ppc64le
X-Git-Url: http://git.cdn.openwrt.org/?a=commitdiff_plain;h=94e3d923592fcfe5585c18a0af9b196de0a13072;p=openwrt%2Fstaging%2Fblogic.git

powerpc: Fix kgdb on little endian ppc64le

I spent some time trying to use kgdb and debugged my inability to
resume from kgdb_handle_breakpoint(). NIP is not incremented
and that leads to a loop in the debugger.

I've tested this lightly on a virtual instance with KDB enabled.
After the patch, I am able to get the "go" command to work as
expected.

Signed-off-by: Balbir Singh <bsingharora@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
---

diff --git a/arch/powerpc/kernel/kgdb.c b/arch/powerpc/kernel/kgdb.c
index e77c3ccf8dcf..dbf098121ce6 100644
--- a/arch/powerpc/kernel/kgdb.c
+++ b/arch/powerpc/kernel/kgdb.c
@@ -445,7 +445,11 @@ int kgdb_arch_handle_exception(int vector, int signo, int err_code,
  * Global data
  */
 struct kgdb_arch arch_kgdb_ops = {
+#ifdef __LITTLE_ENDIAN__
+	.gdb_bpt_instr = {0x08, 0x10, 0x82, 0x7d},
+#else
 	.gdb_bpt_instr = {0x7d, 0x82, 0x10, 0x08},
+#endif
 };
 
 static int kgdb_not_implemented(struct pt_regs *regs)