ARM: kprobes: Add condition code checking to Thumb emulation

#include "kprobes.h"

/*

 * True if current instruction is in an IT block.

 */

#define in_it_block(cpsr)	((cpsr & 0x06000c00) != 0x00000000)

/*

 * Return the condition code to check for the currently executing instruction.

 * This is in ITSTATE<7:4> which is in CPSR<15:12> but is only valid if

 * in_it_block returns true.

 */

#define current_cond(cpsr)	((cpsr >> 12) & 0xf)

static unsigned long __kprobes thumb_check_cc(unsigned long cpsr)

{

	if (unlikely(in_it_block(cpsr)))

		return kprobe_condition_checks[current_cond(cpsr)](cpsr);

	return true;

}

enum kprobe_insn __kprobes

thumb16_kprobe_decode_insn(kprobe_opcode_t insn, struct arch_specific_insn *asi)

{

	asi->insn_check_cc = thumb_check_cc;

	return INSN_REJECTED;

}

enum kprobe_insn __kprobes

thumb32_kprobe_decode_insn(kprobe_opcode_t insn, struct arch_specific_insn *asi)

{

	asi->insn_check_cc = thumb_check_cc;

	return INSN_REJECTED;

}