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;
@@ -108,7 +108,7 @@ 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));
@@ -116,7 +116,7 @@ emulate_generic_r2_14_noflags(probes_opcode_t insn,
 
 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));
@@ -124,7 +124,7 @@ emulate_ldm_r3_15(probes_opcode_t insn,
 }
 
 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;

arch/arm/kernel/kprobes.h

@@ -30,11 +30,11 @@
 #define KPROBE_THUMB32_BREAKPOINT_INSTRUCTION	0xf7f0a018
 
 enum probes_insn __kprobes
-kprobe_decode_ldmstm(kprobe_opcode_t insn, struct arch_specific_insn *asi,
+kprobe_decode_ldmstm(kprobe_opcode_t insn, struct arch_probes_insn *asi,
 		const struct decode_header *h);
 
 typedef enum probes_insn (kprobe_decode_insn_t)(probes_opcode_t,
-						struct arch_specific_insn *,
+						struct arch_probes_insn *,
 						bool,
 						const union decode_action *);
 

arch/arm/kernel/probes-arm.c

@@ -58,7 +58,7 @@
  */
 
 void __kprobes simulate_bbl(probes_opcode_t insn,
-		struct arch_specific_insn *asi, struct pt_regs *regs)
+		struct arch_probes_insn *asi, struct pt_regs *regs)
 {
 	long iaddr = (long) regs->ARM_pc - 4;
 	int disp  = branch_displacement(insn);
@@ -70,7 +70,7 @@ void __kprobes simulate_bbl(probes_opcode_t insn,
 }
 
 void __kprobes simulate_blx1(probes_opcode_t insn,
-		struct arch_specific_insn *asi, struct pt_regs *regs)
+		struct arch_probes_insn *asi, struct pt_regs *regs)
 {
 	long iaddr = (long) regs->ARM_pc - 4;
 	int disp = branch_displacement(insn);
@@ -81,7 +81,7 @@ void __kprobes simulate_blx1(probes_opcode_t insn,
 }
 
 void __kprobes simulate_blx2bx(probes_opcode_t insn,
-		struct arch_specific_insn *asi, struct pt_regs *regs)
+		struct arch_probes_insn *asi, struct pt_regs *regs)
 {
 	int rm = insn & 0xf;
 	long rmv = regs->uregs[rm];
@@ -96,7 +96,7 @@ void __kprobes simulate_blx2bx(probes_opcode_t insn,
 }
 
 void __kprobes simulate_mrs(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;
 	unsigned long mask = 0xf8ff03df; /* Mask out execution state */
@@ -104,7 +104,7 @@ void __kprobes simulate_mrs(probes_opcode_t insn,
 }
 
 void __kprobes simulate_mov_ipsp(probes_opcode_t insn,
-		struct arch_specific_insn *asi, struct pt_regs *regs)
+		struct arch_probes_insn *asi, struct pt_regs *regs)
 {
 	regs->uregs[12] = regs->uregs[13];
 }
@@ -705,7 +705,7 @@ EXPORT_SYMBOL_GPL(probes_decode_arm_table);
 #endif
 
 static void __kprobes arm_singlestep(probes_opcode_t insn,
-		struct arch_specific_insn *asi, struct pt_regs *regs)
+		struct arch_probes_insn *asi, struct pt_regs *regs)
 {
 	regs->ARM_pc += 4;
 	asi->insn_handler(insn, asi, regs);
@@ -724,7 +724,7 @@ static void __kprobes arm_singlestep(probes_opcode_t insn,
  *   should also be very rare.
  */
 enum probes_insn __kprobes
-arm_probes_decode_insn(probes_opcode_t insn, struct arch_specific_insn *asi,
+arm_probes_decode_insn(probes_opcode_t insn, struct arch_probes_insn *asi,
 		       bool emulate, const union decode_action *actions)
 {
 	asi->insn_singlestep = arm_singlestep;

arch/arm/kernel/probes-arm.h

@@ -54,20 +54,20 @@ enum probes_arm_action {
 };
 
 void __kprobes simulate_bbl(probes_opcode_t opcode,
-	struct arch_specific_insn *asi, struct pt_regs *regs);
+	struct arch_probes_insn *asi, struct pt_regs *regs);
 void __kprobes simulate_blx1(probes_opcode_t opcode,
-	struct arch_specific_insn *asi, struct pt_regs *regs);
+	struct arch_probes_insn *asi, struct pt_regs *regs);
 void __kprobes simulate_blx2bx(probes_opcode_t opcode,
-	struct arch_specific_insn *asi, struct pt_regs *regs);
+	struct arch_probes_insn *asi, struct pt_regs *regs);
 void __kprobes simulate_mrs(probes_opcode_t opcode,
-	struct arch_specific_insn *asi, struct pt_regs *regs);
+	struct arch_probes_insn *asi, struct pt_regs *regs);
 void __kprobes simulate_mov_ipsp(probes_opcode_t opcode,
-	struct arch_specific_insn *asi, struct pt_regs *regs);
+	struct arch_probes_insn *asi, struct pt_regs *regs);
 
 extern const union decode_item probes_decode_arm_table[];
 
 enum probes_insn arm_probes_decode_insn(probes_opcode_t,
-		struct arch_specific_insn *, bool emulate,
+		struct arch_probes_insn *, bool emulate,
 		const union decode_action *actions);
 
 #endif

arch/arm/kernel/probes-thumb.c

@@ -844,7 +844,7 @@ static unsigned long __kprobes thumb_check_cc(unsigned long cpsr)
 }
 
 static void __kprobes thumb16_singlestep(probes_opcode_t opcode,
-		struct arch_specific_insn *asi,
+		struct arch_probes_insn *asi,
 		struct pt_regs *regs)
 {
 	regs->ARM_pc += 2;
@@ -853,7 +853,7 @@ static void __kprobes thumb16_singlestep(probes_opcode_t opcode,
 }
 
 static void __kprobes thumb32_singlestep(probes_opcode_t opcode,
-		struct arch_specific_insn *asi,
+		struct arch_probes_insn *asi,
 		struct pt_regs *regs)
 {
 	regs->ARM_pc += 4;
@@ -862,7 +862,7 @@ static void __kprobes thumb32_singlestep(probes_opcode_t opcode,
 }
 
 enum probes_insn __kprobes
-thumb16_probes_decode_insn(probes_opcode_t insn, struct arch_specific_insn *asi,
+thumb16_probes_decode_insn(probes_opcode_t insn, struct arch_probes_insn *asi,
 			   bool emulate, const union decode_action *actions)
 {
 	asi->insn_singlestep = thumb16_singlestep;
@@ -872,7 +872,7 @@ thumb16_probes_decode_insn(probes_opcode_t insn, struct arch_specific_insn *asi,
 }
 
 enum probes_insn __kprobes
-thumb32_probes_decode_insn(probes_opcode_t insn, struct arch_specific_insn *asi,
+thumb32_probes_decode_insn(probes_opcode_t insn, struct arch_probes_insn *asi,
 			   bool emulate, const union decode_action *actions)
 {
 	asi->insn_singlestep = thumb32_singlestep;

arch/arm/kernel/probes-thumb.h

@@ -88,10 +88,10 @@ extern const union decode_item probes_decode_thumb32_table[];
 extern const union decode_item probes_decode_thumb16_table[];
 
 enum probes_insn __kprobes
-thumb16_probes_decode_insn(probes_opcode_t insn, struct arch_specific_insn *asi,
+thumb16_probes_decode_insn(probes_opcode_t insn, struct arch_probes_insn *asi,
 		bool emulate, const union decode_action *actions);
 enum probes_insn __kprobes
-thumb32_probes_decode_insn(probes_opcode_t insn, struct arch_specific_insn *asi,
+thumb32_probes_decode_insn(probes_opcode_t insn, struct arch_probes_insn *asi,
 		bool emulate, const union decode_action *actions);
 
 #endif

arch/arm/kernel/probes.c

@@ -176,13 +176,13 @@ probes_check_cc * const probes_condition_checks[16] = {
 
 
 void __kprobes probes_simulate_nop(probes_opcode_t opcode,
-	struct arch_specific_insn *asi,
+	struct arch_probes_insn *asi,
 	struct pt_regs *regs)
 {
 }
 
 void __kprobes probes_emulate_none(probes_opcode_t opcode,
-	struct arch_specific_insn *asi,
+	struct arch_probes_insn *asi,
 	struct pt_regs *regs)
 {
 	asi->insn_fn();
@@ -196,7 +196,7 @@ void __kprobes probes_emulate_none(probes_opcode_t opcode,
  * emulation handler is called.
  */
 static probes_opcode_t __kprobes
-prepare_emulated_insn(probes_opcode_t insn, struct arch_specific_insn *asi,
+prepare_emulated_insn(probes_opcode_t insn, struct arch_probes_insn *asi,
 		      bool thumb)
 {
 #ifdef CONFIG_THUMB2_KERNEL
@@ -221,7 +221,7 @@ prepare_emulated_insn(probes_opcode_t insn, struct arch_specific_insn *asi,
  * prepare_emulated_insn
  */
 static void  __kprobes
-set_emulated_insn(probes_opcode_t insn, struct arch_specific_insn *asi,
+set_emulated_insn(probes_opcode_t insn, struct arch_probes_insn *asi,
 		  bool thumb)
 {
 #ifdef CONFIG_THUMB2_KERNEL
@@ -385,7 +385,7 @@ static const int decode_struct_sizes[NUM_DECODE_TYPES] = {
  *
  */
 int __kprobes
-probes_decode_insn(probes_opcode_t insn, struct arch_specific_insn *asi,
+probes_decode_insn(probes_opcode_t insn, struct arch_probes_insn *asi,
 		   const union decode_item *table, bool thumb,
 		   bool emulate, const union decode_action *actions)
 {

arch/arm/kernel/probes.h

@@ -306,7 +306,7 @@ union decode_item {
 
 struct decode_header;
 typedef enum probes_insn (probes_custom_decode_t)(probes_opcode_t,
-						  struct arch_specific_insn *,
+						  struct arch_probes_insn *,
 						  const struct decode_header *);
 
 union decode_action {
@@ -400,7 +400,7 @@ probes_insn_handler_t probes_simulate_nop;
 probes_insn_handler_t probes_emulate_none;
 
 int __kprobes
-probes_decode_insn(probes_opcode_t insn, struct arch_specific_insn *asi,
+probes_decode_insn(probes_opcode_t insn, struct arch_probes_insn *asi,
 		const union decode_item *table, bool thumb, bool emulate,
 		const union decode_action *actions);