powerpc: Use a function for getting the instruction op code

In preparation for using a data type for instructions that can not be
directly used with the '>>' operator use a function for getting the op
code of an instruction.
Signed-off-by: Jordan Niethe <jniethe5@gmail.com>
Reviewed-by: Alistair Popple <alistair@popple.id.au>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20200506034050.24806-9-jniethe5@gmail.com

arch/powerpc/include/asm/inst.h

@@ -13,4 +13,9 @@ static inline u32 ppc_inst_val(u32 x)
 	return x;
 }
 
+static inline int ppc_inst_primary_opcode(u32 x)
+{
+	return ppc_inst_val(x) >> 26;
+}
+
 #endif /* _ASM_POWERPC_INST_H */

arch/powerpc/kernel/align.c

@@ -314,7 +314,7 @@ int fix_alignment(struct pt_regs *regs)
 	}
 
 #ifdef CONFIG_SPE
-	if ((ppc_inst_val(instr) >> 26) == 0x4) {
+	if (ppc_inst_primary_opcode(instr) == 0x4) {
 		int reg = (ppc_inst_val(instr) >> 21) & 0x1f;
 		PPC_WARN_ALIGNMENT(spe, regs);
 		return emulate_spe(regs, reg, instr);

arch/powerpc/kernel/vecemu.c

@@ -10,6 +10,7 @@
 #include <asm/processor.h>
 #include <asm/switch_to.h>
 #include <linux/uaccess.h>
+#include <asm/inst.h>
 
 /* Functions in vector.S */
 extern void vaddfp(vector128 *dst, vector128 *a, vector128 *b);
@@ -268,7 +269,7 @@ int emulate_altivec(struct pt_regs *regs)
 		return -EFAULT;
 
 	word = ppc_inst_val(instr);
-	if ((word >> 26) != 4)
+	if (ppc_inst_primary_opcode(instr) != 4)
 		return -EINVAL;		/* not an altivec instruction */
 	vd = (word >> 21) & 0x1f;
 	va = (word >> 16) & 0x1f;

arch/powerpc/lib/code-patching.c

@@ -231,7 +231,7 @@ bool is_offset_in_branch_range(long offset)
  */
 bool is_conditional_branch(unsigned int instr)
 {
-	unsigned int opcode = instr >> 26;
+	unsigned int opcode = ppc_inst_primary_opcode(instr);
 
 	if (opcode == 16)       /* bc, bca, bcl, bcla */
 		return true;
@@ -289,7 +289,7 @@ int create_cond_branch(unsigned int *instr, const unsigned int *addr,
 
 static unsigned int branch_opcode(unsigned int instr)
 {
-	return (instr >> 26) & 0x3F;
+	return ppc_inst_primary_opcode(instr) & 0x3F;
 }
 
 static int instr_is_branch_iform(unsigned int instr)

arch/powerpc/lib/sstep.c

@@ -1175,7 +1175,7 @@ int analyse_instr(struct instruction_op *op, const struct pt_regs *regs,
 	word = ppc_inst_val(instr);
 	op->type = COMPUTE;
 
-	opcode = instr >> 26;
+	opcode = ppc_inst_primary_opcode(instr);
 	switch (opcode) {
 	case 16:	/* bc */
 		op->type = BRANCH;

arch/powerpc/mm/fault.c

@@ -41,6 +41,7 @@
 #include <asm/siginfo.h>
 #include <asm/debug.h>
 #include <asm/kup.h>
+#include <asm/inst.h>
 
 /*
  * Check whether the instruction inst is a store using
@@ -52,7 +53,7 @@ static bool store_updates_sp(unsigned int inst)
 	if (((ppc_inst_val(inst) >> 16) & 0x1f) != 1)
 		return false;
 	/* check major opcode */
-	switch (inst >> 26) {
+	switch (ppc_inst_primary_opcode(inst)) {
 	case OP_STWU:
 	case OP_STBU:
 	case OP_STHU: