ARM: use a function table for determining instruction interpreter action

Make the instruction interpreter call back to semantic action functions
through a function pointer array provided by the invoker.  The interpreter
decodes the instructions into groups and uses the group number to index
into the supplied array.  kprobes and uprobes code will each supply their
own array of functions.

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

1 files changed, 11 insertions, 4 deletions

diff --git a/arch/arm/kernel/kprobes.h b/arch/arm/kernel/kprobes.h
index aa68c0ea1a0b..7798035d6003 100644
--- a/arch/arm/kernel/kprobes.h
+++ b/arch/arm/kernel/kprobes.h
@@ -27,6 +27,8 @@
 #define KPROBE_THUMB16_BREAKPOINT_INSTRUCTION	0xde18
 #define KPROBE_THUMB32_BREAKPOINT_INSTRUCTION	0xf7f0a018
 
+struct decode_header;
+union decode_action;
 
 enum kprobe_insn {
 	INSN_REJECTED,
@@ -35,19 +37,24 @@ enum kprobe_insn {
 };
 
 typedef enum kprobe_insn (kprobe_decode_insn_t)(kprobe_opcode_t,
-						struct arch_specific_insn *);
+						struct arch_specific_insn *,
+						const union decode_action *);
 
 #ifdef CONFIG_THUMB2_KERNEL
 
 enum kprobe_insn thumb16_kprobe_decode_insn(kprobe_opcode_t,
-						struct arch_specific_insn *);
+					    struct arch_specific_insn *,
+					    const union decode_action *);
 enum kprobe_insn thumb32_kprobe_decode_insn(kprobe_opcode_t,
-						struct arch_specific_insn *);
+					    struct arch_specific_insn *,
+					    const union decode_action *);
 
 #else /* !CONFIG_THUMB2_KERNEL */
 
 enum kprobe_insn arm_kprobe_decode_insn(kprobe_opcode_t,
-					struct arch_specific_insn *);
+					struct arch_specific_insn *,
+					const union decode_action *);
+
 #endif
 
 void __init arm_kprobe_decode_init(void);