ARM: Make arch_specific_insn a define for new arch_probes_insn structure

Because the common underlying code for ARM kprobes and uprobes needs
to share a common architecrure-specific context structure, and because
the generic kprobes include file insists on defining this to a dummy
structure when kprobes is not configured, a new common structure is
required which can exist when uprobes is configured without kprobes.
In this case kprobes will define a dummy structure, but without the
define aliasing the two structure tags it will not affect uprobes and
the shared probes code.

Signed-off-by: David A. Long <dave.long@linaro.org>
Acked-by: Jon Medhurst <tixy@linaro.org>

arch/arm/include/asm/kprobes.h

@@ -31,6 +31,8 @@ typedef u32 kprobe_opcode_t;
 struct kprobe;
 #include <asm/probes.h>
 
+#define	arch_specific_insn	arch_probes_insn
+
 struct prev_kprobe {
 	struct kprobe *kp;
 	unsigned int status;

arch/arm/include/asm/probes.h

@@ -21,18 +21,18 @@
 
 typedef u32 probes_opcode_t;
 
-struct arch_specific_insn;
+struct arch_probes_insn;
 typedef void (probes_insn_handler_t)(probes_opcode_t,
-				     struct arch_specific_insn *,
+				     struct arch_probes_insn *,
 				     struct pt_regs *);
 typedef unsigned long (probes_check_cc)(unsigned long);
 typedef void (probes_insn_singlestep_t)(probes_opcode_t,
-					struct arch_specific_insn *,
+					struct arch_probes_insn *,
 					struct pt_regs *);
 typedef void (probes_insn_fn_t)(void);
 
 /* Architecture specific copy of original instruction. */
-struct arch_specific_insn {
+struct arch_probes_insn {
 	probes_opcode_t			*insn;
 	probes_insn_handler_t		*insn_handler;
 	probes_check_cc			*insn_check_cc;

arch/arm/kernel/kprobes-arm.c

@@ -74,7 +74,7 @@
 
 static void __kprobes
 emulate_ldrdstrd(probes_opcode_t insn,
-	struct arch_specific_insn *asi, struct pt_regs *regs)
+	struct arch_probes_insn *asi, struct pt_regs *regs)
 {
 	unsigned long pc = regs->ARM_pc + 4;
 	int rt = (insn >> 12) & 0xf;
@@ -103,7 +103,7 @@ emulate_ldrdstrd(probes_opcode_t insn,
 
 static void __kprobes
 emulate_ldr(probes_opcode_t insn,
-	struct arch_specific_insn *asi, struct pt_regs *regs)
+	struct arch_probes_insn *asi, struct pt_regs *regs)
 {
 	unsigned long pc = regs->ARM_pc + 4;
 	int rt = (insn >> 12) & 0xf;
@@ -133,7 +133,7 @@ emulate_ldr(probes_opcode_t insn,
 
 static void __kprobes
 emulate_str(probes_opcode_t insn,
-	struct arch_specific_insn *asi, struct pt_regs *regs)
+	struct arch_probes_insn *asi, struct pt_regs *regs)
 {
 	unsigned long rtpc = regs->ARM_pc - 4 + str_pc_offset;
 	unsigned long rnpc = regs->ARM_pc + 4;
@@ -160,7 +160,7 @@ emulate_str(probes_opcode_t insn,
 
 static void __kprobes
 emulate_rd12rn16rm0rs8_rwflags(probes_opcode_t insn,
-	struct arch_specific_insn *asi, struct pt_regs *regs)
+	struct arch_probes_insn *asi, struct pt_regs *regs)
 {
 	unsigned long pc = regs->ARM_pc + 4;
 	int rd = (insn >> 12) & 0xf;
@@ -195,7 +195,7 @@ emulate_rd12rn16rm0rs8_rwflags(probes_opcode_t insn,
 
 static void __kprobes
 emulate_rd12rn16rm0_rwflags_nopc(probes_opcode_t insn,
-	struct arch_specific_insn *asi, struct pt_regs *regs)
+	struct arch_probes_insn *asi, struct pt_regs *regs)
 {
 	int rd = (insn >> 12) & 0xf;
 	int rn = (insn >> 16) & 0xf;
@@ -222,7 +222,7 @@ emulate_rd12rn16rm0_rwflags_nopc(probes_opcode_t insn,
 
 static void __kprobes
 emulate_rd16rn12rm0rs8_rwflags_nopc(probes_opcode_t insn,
-	struct arch_specific_insn *asi,
+	struct arch_probes_insn *asi,
 	struct pt_regs *regs)
 {
 	int rd = (insn >> 16) & 0xf;
@@ -252,7 +252,7 @@ emulate_rd16rn12rm0rs8_rwflags_nopc(probes_opcode_t insn,
 
 static void __kprobes
 emulate_rd12rm0_noflags_nopc(probes_opcode_t insn,
-	struct arch_specific_insn *asi, struct pt_regs *regs)
+	struct arch_probes_insn *asi, struct pt_regs *regs)
 {
 	int rd = (insn >> 12) & 0xf;
 	int rm = insn & 0xf;
@@ -272,7 +272,7 @@ emulate_rd12rm0_noflags_nopc(probes_opcode_t insn,
 
 static void __kprobes
 emulate_rdlo12rdhi16rn0rm8_rwflags_nopc(probes_opcode_t insn,
-	struct arch_specific_insn *asi,
+	struct arch_probes_insn *asi,
 	struct pt_regs *regs)
 {
 	int rdlo = (insn >> 12) & 0xf;

arch/arm/kernel/kprobes-common.c

@@ -18,7 +18,7 @@
 
 
 static void __kprobes simulate_ldm1stm1(probes_opcode_t insn,
-		struct arch_specific_insn *asi,
+		struct arch_probes_insn *asi,
 		struct pt_regs *regs)
 {
 	int rn = (insn >> 16) & 0xf;
@@ -60,7 +60,7 @@ static void __kprobes simulate_ldm1stm1(probes_opcode_t insn,
 }
 
 static void __kprobes simulate_stm1_pc(probes_opcode_t insn,
-	struct arch_specific_insn *asi,
+	struct arch_probes_insn *asi,
 	struct pt_regs *regs)
 {
 	unsigned long addr = regs->ARM_pc - 4;
@@ -71,7 +71,7 @@ static void __kprobes simulate_stm1_pc(probes_opcode_t insn,
 }
 
 static void __kprobes simulate_ldm1_pc(probes_opcode_t insn,
-	struct arch_specific_insn *asi,
+	struct arch_probes_insn *asi,
 	struct pt_regs *regs)
 {
 	simulate_ldm1stm1(insn, asi, regs);
@@ -80,7 +80,7 @@ static void __kprobes simulate_ldm1_pc(probes_opcode_t insn,
 
 static void __kprobes
 emulate_generic_r0_12_noflags(probes_opcode_t insn,
-	struct arch_specific_insn *asi, struct pt_regs *regs)
+	struct arch_probes_insn *asi, struct pt_regs *regs)
 {
 	register void *rregs asm("r1") = regs;
 	register void *rfn asm("lr") = asi->insn_fn;
@@ -108,23 +108,23 @@ emulate_generic_r0_12_noflags(probes_opcode_t insn,
 
 static void __kprobes
 emulate_generic_r2_14_noflags(probes_opcode_t insn,
-	struct arch_specific_insn *asi, struct pt_regs *regs)
+	struct arch_probes_insn *asi, struct pt_regs *regs)
 {
 	emulate_generic_r0_12_noflags(insn, asi,
 		(struct pt_regs *)(regs->uregs+2));
 }
 
 static void __kprobes
 emulate_ldm_r3_15(probes_opcode_t insn,
-	struct arch_specific_insn *asi, struct pt_regs *regs)
+	struct arch_probes_insn *asi, struct pt_regs *regs)
 {
 	emulate_generic_r0_12_noflags(insn, asi,
 		(struct pt_regs *)(regs->uregs+3));
 	load_write_pc(regs->ARM_pc, regs);
 }
 
 enum probes_insn __kprobes
-kprobe_decode_ldmstm(probes_opcode_t insn, struct arch_specific_insn *asi,
+kprobe_decode_ldmstm(probes_opcode_t insn, struct arch_probes_insn *asi,
 		const struct decode_header *h)
 {
 	probes_insn_handler_t *handler = 0;