arch/arm/probes/decode-thumb.c

Source file repositories/reference/linux-study-clean/arch/arm/probes/decode-thumb.c

File Facts

System
Linux kernel
Corpus path
arch/arm/probes/decode-thumb.c
Extension
.c
Size
32328 bytes
Lines
882
Domain
Architecture Layer
Bucket
arch/arm
Inferred role
Architecture Layer: exported/initcall integration point
Status
integration implementation candidate

Why This File Exists

CPU and platform-specific kernel glue: boot entry, traps, syscall entry, interrupts, page tables, context switch, and low-level barriers.

Dependency Surface

Detected Declarations

Annotated Snippet

// SPDX-License-Identifier: GPL-2.0-only
/*
 * arch/arm/probes/decode-thumb.c
 *
 * Copyright (C) 2011 Jon Medhurst <tixy@yxit.co.uk>.
 */

#include <linux/stddef.h>
#include <linux/kernel.h>
#include <linux/module.h>

#include "decode.h"
#include "decode-thumb.h"


static const union decode_item t32_table_1110_100x_x0xx[] = {
	/* Load/store multiple instructions */

	/* Rn is PC		1110 100x x0xx 1111 xxxx xxxx xxxx xxxx */
	DECODE_REJECT	(0xfe4f0000, 0xe80f0000),

	/* SRS			1110 1000 00x0 xxxx xxxx xxxx xxxx xxxx */
	/* RFE			1110 1000 00x1 xxxx xxxx xxxx xxxx xxxx */
	DECODE_REJECT	(0xffc00000, 0xe8000000),
	/* SRS			1110 1001 10x0 xxxx xxxx xxxx xxxx xxxx */
	/* RFE			1110 1001 10x1 xxxx xxxx xxxx xxxx xxxx */
	DECODE_REJECT	(0xffc00000, 0xe9800000),

	/* STM Rn, {...pc}	1110 100x x0x0 xxxx 1xxx xxxx xxxx xxxx */
	DECODE_REJECT	(0xfe508000, 0xe8008000),
	/* LDM Rn, {...lr,pc}	1110 100x x0x1 xxxx 11xx xxxx xxxx xxxx */
	DECODE_REJECT	(0xfe50c000, 0xe810c000),
	/* LDM/STM Rn, {...sp}	1110 100x x0xx xxxx xx1x xxxx xxxx xxxx */
	DECODE_REJECT	(0xfe402000, 0xe8002000),

	/* STMIA		1110 1000 10x0 xxxx xxxx xxxx xxxx xxxx */
	/* LDMIA		1110 1000 10x1 xxxx xxxx xxxx xxxx xxxx */
	/* STMDB		1110 1001 00x0 xxxx xxxx xxxx xxxx xxxx */
	/* LDMDB		1110 1001 00x1 xxxx xxxx xxxx xxxx xxxx */
	DECODE_CUSTOM	(0xfe400000, 0xe8000000, PROBES_T32_LDMSTM),

	DECODE_END
};

static const union decode_item t32_table_1110_100x_x1xx[] = {
	/* Load/store dual, load/store exclusive, table branch */

	/* STRD (immediate)	1110 1000 x110 xxxx xxxx xxxx xxxx xxxx */
	/* LDRD (immediate)	1110 1000 x111 xxxx xxxx xxxx xxxx xxxx */
	DECODE_OR	(0xff600000, 0xe8600000),
	/* STRD (immediate)	1110 1001 x1x0 xxxx xxxx xxxx xxxx xxxx */
	/* LDRD (immediate)	1110 1001 x1x1 xxxx xxxx xxxx xxxx xxxx */
	DECODE_EMULATEX	(0xff400000, 0xe9400000, PROBES_T32_LDRDSTRD,
						 REGS(NOPCWB, NOSPPC, NOSPPC, 0, 0)),

	/* TBB			1110 1000 1101 xxxx xxxx xxxx 0000 xxxx */
	/* TBH			1110 1000 1101 xxxx xxxx xxxx 0001 xxxx */
	DECODE_SIMULATEX(0xfff000e0, 0xe8d00000, PROBES_T32_TABLE_BRANCH,
						 REGS(NOSP, 0, 0, 0, NOSPPC)),

	/* STREX		1110 1000 0100 xxxx xxxx xxxx xxxx xxxx */
	/* LDREX		1110 1000 0101 xxxx xxxx xxxx xxxx xxxx */
	/* STREXB		1110 1000 1100 xxxx xxxx xxxx 0100 xxxx */
	/* STREXH		1110 1000 1100 xxxx xxxx xxxx 0101 xxxx */
	/* STREXD		1110 1000 1100 xxxx xxxx xxxx 0111 xxxx */
	/* LDREXB		1110 1000 1101 xxxx xxxx xxxx 0100 xxxx */
	/* LDREXH		1110 1000 1101 xxxx xxxx xxxx 0101 xxxx */
	/* LDREXD		1110 1000 1101 xxxx xxxx xxxx 0111 xxxx */
	/* And unallocated instructions...				*/
	DECODE_END
};

static const union decode_item t32_table_1110_101x[] = {
	/* Data-processing (shifted register)				*/

	/* TST			1110 1010 0001 xxxx xxxx 1111 xxxx xxxx */
	/* TEQ			1110 1010 1001 xxxx xxxx 1111 xxxx xxxx */
	DECODE_EMULATEX	(0xff700f00, 0xea100f00, PROBES_T32_TST,
						 REGS(NOSPPC, 0, 0, 0, NOSPPC)),

	/* CMN			1110 1011 0001 xxxx xxxx 1111 xxxx xxxx */
	DECODE_OR	(0xfff00f00, 0xeb100f00),
	/* CMP			1110 1011 1011 xxxx xxxx 1111 xxxx xxxx */
	DECODE_EMULATEX	(0xfff00f00, 0xebb00f00, PROBES_T32_TST,
						 REGS(NOPC, 0, 0, 0, NOSPPC)),

	/* MOV			1110 1010 010x 1111 xxxx xxxx xxxx xxxx */
	/* MVN			1110 1010 011x 1111 xxxx xxxx xxxx xxxx */
	DECODE_EMULATEX	(0xffcf0000, 0xea4f0000, PROBES_T32_MOV,
						 REGS(0, 0, NOSPPC, 0, NOSPPC)),

Annotation

Implementation Notes