powerpc: Merge xmon

The merged version follows the ppc64 version pretty closely mostly,
and in fact ARCH=ppc64 now uses the arch/powerpc/xmon version.
The main difference for ppc64 is that the 'p' command to call
show_state (which was always pretty dodgy) has been replaced by
the ppc32 'p' command, which calls a given procedure (so in fact
the old 'p' command behaviour can be achieved with 'p $show_state').

Signed-off-by: Paul Mackerras <paulus@samba.org>

include/asm-powerpc/ppc_asm.h

@@ -188,6 +188,10 @@ n:
 #define LDL	ld
 #define STL	std
 #define CMPI	cmpdi
+#define SZL	8
+
+/* offsets for stack frame layout */
+#define LRSAVE	16
 
 #else /* 32-bit */
 #define LOADADDR(rn,name) \
@@ -203,6 +207,10 @@ n:
 #define LDL	lwz
 #define STL	stw
 #define CMPI	cmpwi
+#define SZL	4
+
+/* offsets for stack frame layout */
+#define LRSAVE	4
 
 #endif