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Commit e9a92859 authored by Jon Medhurst's avatar Jon Medhurst Committed by Tixy
Browse files

ARM: kprobes: Migrate remaining instruction decoding functions to tables 



Signed-off-by: default avatarJon Medhurst <tixy@yxit.co.uk>
Acked-by: default avatarNicolas Pitre <nicolas.pitre@linaro.org>
parent 0d32e7d1

arch/arm/kernel/kprobes-arm.c

+90 −80
Original line number Diff line number Diff line
@@ -1209,27 +1209,6 @@ static const union decode_item arm_cccc_000x_table[] = { 
	DECODE_END

};



static enum kprobe_insn __kprobes

space_cccc_000x(kprobe_opcode_t insn, struct arch_specific_insn *asi)

{

	if ((insn & 0x0f900080) == 0x01000000)

		return kprobe_decode_insn(insn, asi, arm_cccc_0001_0xx0____0xxx_table, false);



	if ((insn & 0x0f900090) == 0x01000080)

		return kprobe_decode_insn(insn, asi, arm_cccc_0001_0xx0____1xx0_table, false);



	if ((insn & 0x0f0000f0) == 0x00000090)

		return kprobe_decode_insn(insn, asi, arm_cccc_0000_____1001_table, false);



	if ((insn & 0x0f0000f0) == 0x01000090)

		return kprobe_decode_insn(insn, asi, arm_cccc_0001_____1001_table, false);



	if ((insn & 0x0e000090) == 0x00000090)

		return kprobe_decode_insn(insn, asi, arm_cccc_000x_____1xx1_table, false);



	return kprobe_decode_insn(insn, asi, arm_cccc_000x_table, false);

}



static const union decode_item arm_cccc_001x_table[] = {

	/* Data-processing (immediate)					*/
@@ -1447,31 +1426,96 @@ static const union decode_item arm_cccc_100x_table[] = { 
	DECODE_END

};



static enum kprobe_insn __kprobes

space_cccc_101x(kprobe_opcode_t insn, struct arch_specific_insn *asi)

{

	/* B  : cccc 1010 xxxx xxxx xxxx xxxx xxxx xxxx */

	/* BL : cccc 1011 xxxx xxxx xxxx xxxx xxxx xxxx */

	asi->insn_handler = simulate_bbl;

	return INSN_GOOD_NO_SLOT;

}

const union decode_item kprobe_decode_arm_table[] = {

	/*

	 * Unconditional instructions

	 *			1111 xxxx xxxx xxxx xxxx xxxx xxxx xxxx

	 */

	DECODE_TABLE	(0xf0000000, 0xf0000000, arm_1111_table),



static enum kprobe_insn __kprobes

space_cccc_11xx(kprobe_opcode_t insn, struct arch_specific_insn *asi)

{

	/* Coprocessor instructions... */

	/* MCRR : cccc 1100 0100 xxxx xxxx xxxx xxxx xxxx : (Rd!=Rn) */

	/* MRRC : cccc 1100 0101 xxxx xxxx xxxx xxxx xxxx : (Rd!=Rn) */

	/* LDC  : cccc 110x xxx1 xxxx xxxx xxxx xxxx xxxx */

	/* STC  : cccc 110x xxx0 xxxx xxxx xxxx xxxx xxxx */

	/* CDP  : cccc 1110 xxxx xxxx xxxx xxxx xxx0 xxxx */

	/* MCR  : cccc 1110 xxx0 xxxx xxxx xxxx xxx1 xxxx */

	/* MRC  : cccc 1110 xxx1 xxxx xxxx xxxx xxx1 xxxx */

	/*

	 * Miscellaneous instructions

	 *			cccc 0001 0xx0 xxxx xxxx xxxx 0xxx xxxx

	 */

	DECODE_TABLE	(0x0f900080, 0x01000000, arm_cccc_0001_0xx0____0xxx_table),



	/* SVC  : cccc 1111 xxxx xxxx xxxx xxxx xxxx xxxx */

	/*

	 * Halfword multiply and multiply-accumulate

	 *			cccc 0001 0xx0 xxxx xxxx xxxx 1xx0 xxxx

	 */

	DECODE_TABLE	(0x0f900090, 0x01000080, arm_cccc_0001_0xx0____1xx0_table),



	return INSN_REJECTED;

}

	/*

	 * Multiply and multiply-accumulate

	 *			cccc 0000 xxxx xxxx xxxx xxxx 1001 xxxx

	 */

	DECODE_TABLE	(0x0f0000f0, 0x00000090, arm_cccc_0000_____1001_table),



	/*

	 * Synchronization primitives

	 *			cccc 0001 xxxx xxxx xxxx xxxx 1001 xxxx

	 */

	DECODE_TABLE	(0x0f0000f0, 0x01000090, arm_cccc_0001_____1001_table),



	/*

	 * Extra load/store instructions

	 *			cccc 000x xxxx xxxx xxxx xxxx 1xx1 xxxx

	 */

	DECODE_TABLE	(0x0e000090, 0x00000090, arm_cccc_000x_____1xx1_table),



	/*

	 * Data-processing (register)

	 *			cccc 000x xxxx xxxx xxxx xxxx xxx0 xxxx

	 * Data-processing (register-shifted register)

	 *			cccc 000x xxxx xxxx xxxx xxxx 0xx1 xxxx

	 */

	DECODE_TABLE	(0x0e000000, 0x00000000, arm_cccc_000x_table),



	/*

	 * Data-processing (immediate)

	 *			cccc 001x xxxx xxxx xxxx xxxx xxxx xxxx

	 */

	DECODE_TABLE	(0x0e000000, 0x02000000, arm_cccc_001x_table),



	/*

	 * Media instructions

	 *			cccc 011x xxxx xxxx xxxx xxxx xxx1 xxxx

	 */

	DECODE_TABLE	(0x0f000010, 0x06000010, arm_cccc_0110_____xxx1_table),

	DECODE_TABLE	(0x0f000010, 0x07000010, arm_cccc_0111_____xxx1_table),



	/*

	 * Load/store word and unsigned byte

	 *			cccc 01xx xxxx xxxx xxxx xxxx xxxx xxxx

	 */

	DECODE_TABLE	(0x0c000000, 0x04000000, arm_cccc_01xx_table),



	/*

	 * Block data transfer instructions

	 *			cccc 100x xxxx xxxx xxxx xxxx xxxx xxxx

	 */

	DECODE_TABLE	(0x0e000000, 0x08000000, arm_cccc_100x_table),



	/* B			cccc 1010 xxxx xxxx xxxx xxxx xxxx xxxx */

	/* BL			cccc 1011 xxxx xxxx xxxx xxxx xxxx xxxx */

	DECODE_SIMULATE	(0x0e000000, 0x0a000000, simulate_bbl),



	/*

	 * Supervisor Call, and coprocessor instructions

	 */



	/* MCRR			cccc 1100 0100 xxxx xxxx xxxx xxxx xxxx */

	/* MRRC			cccc 1100 0101 xxxx xxxx xxxx xxxx xxxx */

	/* LDC			cccc 110x xxx1 xxxx xxxx xxxx xxxx xxxx */

	/* STC			cccc 110x xxx0 xxxx xxxx xxxx xxxx xxxx */

	/* CDP			cccc 1110 xxxx xxxx xxxx xxxx xxx0 xxxx */

	/* MCR			cccc 1110 xxx0 xxxx xxxx xxxx xxx1 xxxx */

	/* MRC			cccc 1110 xxx1 xxxx xxxx xxxx xxx1 xxxx */

	/* SVC			cccc 1111 xxxx xxxx xxxx xxxx xxxx xxxx */

	DECODE_REJECT	(0x0c000000, 0x0c000000),



	DECODE_END

};



static void __kprobes arm_singlestep(struct kprobe *p, struct pt_regs *regs)

{
@@ -1496,39 +1540,5 @@ arm_kprobe_decode_insn(kprobe_opcode_t insn, struct arch_specific_insn *asi) 
{

	asi->insn_singlestep = arm_singlestep;

	asi->insn_check_cc = kprobe_condition_checks[insn>>28];

	asi->insn[1] = KPROBE_RETURN_INSTRUCTION;



	if ((insn & 0xf0000000) == 0xf0000000)



		return kprobe_decode_insn(insn, asi, arm_1111_table, false);



	else if ((insn & 0x0e000000) == 0x00000000)



		return space_cccc_000x(insn, asi);



	else if ((insn & 0x0e000000) == 0x02000000)



		return kprobe_decode_insn(insn, asi, arm_cccc_001x_table, false);



	else if ((insn & 0x0f000010) == 0x06000010)



		return kprobe_decode_insn(insn, asi, arm_cccc_0110_____xxx1_table, false);



	else if ((insn & 0x0f000010) == 0x07000010)



		return kprobe_decode_insn(insn, asi, arm_cccc_0111_____xxx1_table, false);



	else if ((insn & 0x0c000000) == 0x04000000)



		return kprobe_decode_insn(insn, asi, arm_cccc_01xx_table, false);



	else if ((insn & 0x0e000000) == 0x08000000)



		return kprobe_decode_insn(insn, asi, arm_cccc_100x_table, false);



	else if ((insn & 0x0e000000) == 0x0a000000)



		return space_cccc_101x(insn, asi);



	return space_cccc_11xx(insn, asi);

	return kprobe_decode_insn(insn, asi, kprobe_decode_arm_table, false);

}