powerpc/ppc-opcode: Define and use PPC_RAW_TRAP() and PPC_RAW_TW()

Add and use PPC_RAW_TRAP() instead of opencoding.
Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/52c7e522e56a38e3ff0363906919445920005a8f.1657205708.git.christophe.leroy@csgroup.eu

arch/powerpc/include/asm/ppc-opcode.h

@@ -581,6 +581,8 @@
 
 #define PPC_RAW_BRANCH(offset)		(0x48000000 | PPC_LI(offset))
 #define PPC_RAW_BL(offset)		(0x48000001 | PPC_LI(offset))
+#define PPC_RAW_TW(t0, a, b)		(0x7f000008 | ___PPC_RS(t0) | ___PPC_RA(a) | ___PPC_RB(b))
+#define PPC_RAW_TRAP()			PPC_RAW_TW(31, 0, 0)
 
 /* Deal with instructions that older assemblers aren't aware of */
 #define	PPC_BCCTR_FLUSH		stringify_in_c(.long PPC_INST_BCCTR_FLUSH)

arch/powerpc/include/asm/probes.h

@@ -9,8 +9,9 @@
  */
 #include <linux/types.h>
 #include <asm/disassemble.h>
+#include <asm/ppc-opcode.h>
 
-#define BREAKPOINT_INSTRUCTION	0x7fe00008	/* trap */
+#define BREAKPOINT_INSTRUCTION	PPC_RAW_TRAP()	/* trap */
 
 /* Trap definitions per ISA */
 #define IS_TW(instr)		(((instr) & 0xfc0007fe) == 0x7c000008)

arch/powerpc/xmon/xmon.c

@@ -116,7 +116,7 @@ struct bpt {
 static struct bpt bpts[NBPTS];
 static struct bpt dabr[HBP_NUM_MAX];
 static struct bpt *iabr;
-static unsigned bpinstr = 0x7fe00008;	/* trap */
+static unsigned int bpinstr = PPC_RAW_TRAP();
 
 #define BP_NUM(bp)	((bp) - bpts + 1)