linux/arch/arm/kernel/kprobes.h

/*
 * arch/arm/kernel/kprobes.h
 *
 * Contents moved from arch/arm/include/asm/kprobes.h which is
 * Copyright (C) 2006, 2007 Motorola Inc.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 */

#ifndef _ARM_KERNEL_KPROBES_H
#define _ARM_KERNEL_KPROBES_H

/*
 * These undefined instructions must be unique and
 * reserved solely for kprobes' use.
 */
#define KPROBE_ARM_BREAKPOINT_INSTRUCTION	0xe7f001f8
#define KPROBE_THUMB16_BREAKPOINT_INSTRUCTION	0xde18
#define KPROBE_THUMB32_BREAKPOINT_INSTRUCTION	0xf7f0a018


enum kprobe_insn {
	INSN_REJECTED,
	INSN_GOOD,
	INSN_GOOD_NO_SLOT
};

typedef enum kprobe_insn (kprobe_decode_insn_t)(kprobe_opcode_t,
						struct arch_specific_insn *);

#ifdef CONFIG_THUMB2_KERNEL

enum kprobe_insn thumb16_kprobe_decode_insn(kprobe_opcode_t,
						struct arch_specific_insn *);
enum kprobe_insn thumb32_kprobe_decode_insn(kprobe_opcode_t,
						struct arch_specific_insn *);

#else /* !CONFIG_THUMB2_KERNEL */

enum kprobe_insn arm_kprobe_decode_insn(kprobe_opcode_t,
					struct arch_specific_insn *);
#endif

void __init arm_kprobe_decode_init(void);

extern kprobe_check_cc * const kprobe_condition_checks[16];


#if __LINUX_ARM_ARCH__ >= 7

/* str_pc_offset is architecturally defined from ARMv7 onwards */
#define str_pc_offset 8
#define find_str_pc_offset()

#else /* __LINUX_ARM_ARCH__ < 7 */

/* We need a run-time check to determine str_pc_offset */
extern int str_pc_offset;
void __init find_str_pc_offset(void);

#endif


/*
 * Update ITSTATE after normal execution of an IT block instruction.
 *
 * The 8 IT state bits are split into two parts in CPSR:
 *	ITSTATE<1:0> are in CPSR<26:25>
 *	ITSTATE<7:2> are in CPSR<15:10>
 */
static inline unsigned long it_advance(unsigned long cpsr)
	{
	if ((cpsr & 0x06000400) == 0) {
		/* ITSTATE<2:0> == 0 means end of IT block, so clear IT state */
		cpsr &= ~PSR_IT_MASK;
	} else {
		/* We need to shift left ITSTATE<4:0> */
		const unsigned long mask = 0x06001c00;  /* Mask ITSTATE<4:0> */
		unsigned long it = cpsr & mask;
		it <<= 1;
		it |= it >> (27 - 10);  /* Carry ITSTATE<2> to correct place */
		it &= mask;
		cpsr &= ~mask;
		cpsr |= it;
	}
	return cpsr;
}

/*
 * Test if load/store instructions writeback the address register.
 * if P (bit 24) == 0 or W (bit 21) == 1
 */
#define is_writeback(insn) ((insn ^ 0x01000000) & 0x01200000)

#endif /* _ARM_KERNEL_KPROBES_H */