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openocd/src/target/arm_disassembler.c

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/***************************************************************************
* Copyright (C) 2006 by Dominic Rath *
* Dominic.Rath@gmx.de *
* *
* Copyright (C) 2009 by David Brownell *
* *
* This program is free software; you can redistribute it and/or modify *
* it under the terms of the GNU General Public License as published by *
* the Free Software Foundation; either version 2 of the License, or *
* (at your option) any later version. *
* *
* 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. *
* *
* You should have received a copy of the GNU General Public License *
* along with this program; if not, write to the *
* Free Software Foundation, Inc., *
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. *
***************************************************************************/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "target.h"
#include "arm_disassembler.h"
#include <helper/log.h>
/*
* This disassembler supports two main functions for OpenOCD:
*
* - Various "disassemble" commands. OpenOCD can serve as a
* machine-language debugger, without help from GDB.
*
* - Single stepping. Not all ARM cores support hardware single
* stepping. To work without that support, the debugger must
* be able to decode instructions to find out where to put a
* "next instruction" breakpoint.
*
* In addition, interpretation of ETM trace data needs some of the
* decoding mechanisms.
*
* At this writing (September 2009) neither function is complete.
*
* - ARM decoding
* * Old-style syntax (not UAL) is generally used
* * VFP instructions are not understood (ARMv5 and later)
* except as coprocessor 10/11 operations
* * Most ARM instructions through ARMv6 are decoded, but some
* of the post-ARMv4 opcodes may not be handled yet
* CPS, SDIV, UDIV, LDREX*, STREX*, QASX, ...
* * NEON instructions are not understood (ARMv7-A)
*
* - Thumb/Thumb2 decoding
* * UAL syntax should be consistently used
* * Any Thumb2 instructions used in Cortex-M3 (ARMv7-M) should
* be handled properly. Accordingly, so should the subset
* used in Cortex-M0/M1; and "original" 16-bit Thumb from
* ARMv4T and ARMv5T.
* * Conditional effects of Thumb2 "IT" (if-then) instructions
* are not handled: the affected instructions are not shown
* with their now-conditional suffixes.
* * Some ARMv6 and ARMv7-M Thumb2 instructions may not be
* handled (minimally for coprocessor access).
* * SIMD instructions, and some other Thumb2 instructions
* from ARMv7-A, are not understood.
*
* - ThumbEE decoding
* * As a Thumb2 variant, the Thumb2 comments (above) apply.
* * Opcodes changed by ThumbEE mode are not handled; these
* instructions wrongly decode as LDM and STM.
*
* - Jazelle decoding ... no support whatsoever for Jazelle mode
* or decoding. ARM encourages use of the more generic ThumbEE
* mode, instead of Jazelle mode, in current chips.
*
* - Single-step/emulation ... spotty support, which is only weakly
* tested. Thumb2 is not supported. (Arguably a full simulator
* is not needed to support just single stepping. Recognizing
* branch vs non-branch instructions suffices, except when the
* instruction faults and triggers a synchronous exception which
* can be intercepted using other means.)
*
* ARM DDI 0406B "ARM Architecture Reference Manual, ARM v7-A and
* ARM v7-R edition" gives the most complete coverage of the various
* generations of ARM instructions. At this writing it is publicly
* accessible to anyone willing to create an account at the ARM
* web site; see http://www.arm.com/documentation/ for information.
*
* ARM DDI 0403C "ARMv7-M Architecture Reference Manual" provides
* more details relevant to the Thumb2-only processors (such as
* the Cortex-M implementations).
*/
/* textual represenation of the condition field
* ALways (default) is ommitted (empty string) */
static const char *arm_condition_strings[] = {
"EQ", "NE", "CS", "CC", "MI", "PL", "VS", "VC", "HI", "LS", "GE", "LT", "GT", "LE", "", "NV"
};
/* make up for C's missing ROR */
static uint32_t ror(uint32_t value, int places)
{
return (value >> places) | (value << (32 - places));
}
static int evaluate_unknown(uint32_t opcode,
uint32_t address, struct arm_instruction *instruction)
{
instruction->type = ARM_UNDEFINED_INSTRUCTION;
snprintf(instruction->text, 128,
"0x%8.8" PRIx32 "\t0x%8.8" PRIx32
"\tUNDEFINED INSTRUCTION", address, opcode);
return ERROR_OK;
}
static int evaluate_pld(uint32_t opcode,
uint32_t address, struct arm_instruction *instruction)
{
/* PLD */
if ((opcode & 0x0d70f000) == 0x0550f000) {
instruction->type = ARM_PLD;
snprintf(instruction->text,
128,
"0x%8.8" PRIx32 "\t0x%8.8" PRIx32 "\tPLD ...TODO...",
address,
opcode);
return ERROR_OK;
}
return evaluate_unknown(opcode, address, instruction);
}
static int evaluate_srs(uint32_t opcode,
uint32_t address, struct arm_instruction *instruction)
{
const char *wback = (opcode & (1 << 21)) ? "!" : "";
const char *mode = "";
switch ((opcode >> 23) & 0x3) {
case 0:
mode = "DA";
break;
case 1:
/* "IA" is default */
break;
case 2:
mode = "DB";
break;
case 3:
mode = "IB";
break;
}
switch (opcode & 0x0e500000) {
case 0x08400000:
snprintf(instruction->text, 128, "0x%8.8" PRIx32
"\t0x%8.8" PRIx32
"\tSRS%s\tSP%s, #%d",
address, opcode,
mode, wback,
(unsigned)(opcode & 0x1f));
break;
case 0x08100000:
snprintf(instruction->text, 128, "0x%8.8" PRIx32
"\t0x%8.8" PRIx32
"\tRFE%s\tr%d%s",
address, opcode,
mode,
(unsigned)((opcode >> 16) & 0xf), wback);
break;
default:
return evaluate_unknown(opcode, address, instruction);
}
return ERROR_OK;
}
static int evaluate_swi(uint32_t opcode,
uint32_t address, struct arm_instruction *instruction)
{
instruction->type = ARM_SWI;
snprintf(instruction->text, 128,
"0x%8.8" PRIx32 "\t0x%8.8" PRIx32 "\tSVC %#6.6" PRIx32,
address, opcode, (opcode & 0xffffff));
return ERROR_OK;
}
static int evaluate_blx_imm(uint32_t opcode,
uint32_t address, struct arm_instruction *instruction)
{
int offset;
uint32_t immediate;
uint32_t target_address;
instruction->type = ARM_BLX;
immediate = opcode & 0x00ffffff;
/* sign extend 24-bit immediate */
if (immediate & 0x00800000)
offset = 0xff000000 | immediate;
else
offset = immediate;
/* shift two bits left */
offset <<= 2;
/* odd/event halfword */
if (opcode & 0x01000000)
offset |= 0x2;
target_address = address + 8 + offset;
snprintf(instruction->text,
128,
"0x%8.8" PRIx32 "\t0x%8.8" PRIx32 "\tBLX 0x%8.8" PRIx32 "",
address,
opcode,
target_address);
instruction->info.b_bl_bx_blx.reg_operand = -1;
instruction->info.b_bl_bx_blx.target_address = target_address;
return ERROR_OK;
}
static int evaluate_b_bl(uint32_t opcode,
uint32_t address, struct arm_instruction *instruction)
{
uint8_t L;
uint32_t immediate;
int offset;
uint32_t target_address;
immediate = opcode & 0x00ffffff;
L = (opcode & 0x01000000) >> 24;
/* sign extend 24-bit immediate */
if (immediate & 0x00800000)
offset = 0xff000000 | immediate;
else
offset = immediate;
/* shift two bits left */
offset <<= 2;
target_address = address + 8 + offset;
if (L)
instruction->type = ARM_BL;
else
instruction->type = ARM_B;
snprintf(instruction->text,
128,
"0x%8.8" PRIx32 "\t0x%8.8" PRIx32 "\tB%s%s 0x%8.8" PRIx32,
address,
opcode,
(L) ? "L" : "",
COND(opcode),
target_address);
instruction->info.b_bl_bx_blx.reg_operand = -1;
instruction->info.b_bl_bx_blx.target_address = target_address;
return ERROR_OK;
}
/* Coprocessor load/store and double register transfers
* both normal and extended instruction space (condition field b1111) */
static int evaluate_ldc_stc_mcrr_mrrc(uint32_t opcode,
uint32_t address, struct arm_instruction *instruction)
{
uint8_t cp_num = (opcode & 0xf00) >> 8;
/* MCRR or MRRC */
if (((opcode & 0x0ff00000) == 0x0c400000) || ((opcode & 0x0ff00000) == 0x0c500000)) {
uint8_t cp_opcode, Rd, Rn, CRm;
char *mnemonic;
cp_opcode = (opcode & 0xf0) >> 4;
Rd = (opcode & 0xf000) >> 12;
Rn = (opcode & 0xf0000) >> 16;
CRm = (opcode & 0xf);
/* MCRR */
if ((opcode & 0x0ff00000) == 0x0c400000) {
instruction->type = ARM_MCRR;
mnemonic = "MCRR";
} else if ((opcode & 0x0ff00000) == 0x0c500000) {
/* MRRC */
instruction->type = ARM_MRRC;
mnemonic = "MRRC";
} else {
LOG_ERROR("Unknown instruction");
return ERROR_FAIL;
}
snprintf(instruction->text, 128,
"0x%8.8" PRIx32 "\t0x%8.8" PRIx32
"\t%s%s%s p%i, %x, r%i, r%i, c%i",
address, opcode, mnemonic,
((opcode & 0xf0000000) == 0xf0000000)
? "2" : COND(opcode),
COND(opcode), cp_num, cp_opcode, Rd, Rn, CRm);
} else {/* LDC or STC */
uint8_t CRd, Rn, offset;
uint8_t U;
char *mnemonic;
char addressing_mode[32];
CRd = (opcode & 0xf000) >> 12;
Rn = (opcode & 0xf0000) >> 16;
offset = (opcode & 0xff) << 2;
/* load/store */
if (opcode & 0x00100000) {
instruction->type = ARM_LDC;
mnemonic = "LDC";
} else {
instruction->type = ARM_STC;
mnemonic = "STC";
}
U = (opcode & 0x00800000) >> 23;
/* addressing modes */
if ((opcode & 0x01200000) == 0x01000000)/* offset */
snprintf(addressing_mode, 32, "[r%i, #%s%d]",
Rn, U ? "" : "-", offset);
else if ((opcode & 0x01200000) == 0x01200000) /* pre-indexed */
snprintf(addressing_mode, 32, "[r%i, #%s%d]!",
Rn, U ? "" : "-", offset);
else if ((opcode & 0x01200000) == 0x00200000) /* post-indexed */
snprintf(addressing_mode, 32, "[r%i], #%s%d",
Rn, U ? "" : "-", offset);
else if ((opcode & 0x01200000) == 0x00000000) /* unindexed */
snprintf(addressing_mode, 32, "[r%i], {%d}",
Rn, offset >> 2);
snprintf(instruction->text, 128, "0x%8.8" PRIx32
"\t0x%8.8" PRIx32
"\t%s%s%s p%i, c%i, %s",
address, opcode, mnemonic,
((opcode & 0xf0000000) == 0xf0000000)
? "2" : COND(opcode),
(opcode & (1 << 22)) ? "L" : "",
cp_num, CRd, addressing_mode);
}
return ERROR_OK;
}
/* Coprocessor data processing instructions
* Coprocessor register transfer instructions
* both normal and extended instruction space (condition field b1111) */
static int evaluate_cdp_mcr_mrc(uint32_t opcode,
uint32_t address, struct arm_instruction *instruction)
{
const char *cond;
char *mnemonic;
uint8_t cp_num, opcode_1, CRd_Rd, CRn, CRm, opcode_2;
cond = ((opcode & 0xf0000000) == 0xf0000000) ? "2" : COND(opcode);
cp_num = (opcode & 0xf00) >> 8;
CRd_Rd = (opcode & 0xf000) >> 12;
CRn = (opcode & 0xf0000) >> 16;
CRm = (opcode & 0xf);
opcode_2 = (opcode & 0xe0) >> 5;
/* CDP or MRC/MCR */
if (opcode & 0x00000010) { /* bit 4 set -> MRC/MCR */
if (opcode & 0x00100000) { /* bit 20 set -> MRC */
instruction->type = ARM_MRC;
mnemonic = "MRC";
} else {/* bit 20 not set -> MCR */
instruction->type = ARM_MCR;
mnemonic = "MCR";
}
opcode_1 = (opcode & 0x00e00000) >> 21;
snprintf(instruction->text,
128,
"0x%8.8" PRIx32 "\t0x%8.8" PRIx32 "\t%s%s p%i, 0x%2.2x, r%i, c%i, c%i, 0x%2.2x",
address,
opcode,
mnemonic,
cond,
cp_num,
opcode_1,
CRd_Rd,
CRn,
CRm,
opcode_2);
} else {/* bit 4 not set -> CDP */
instruction->type = ARM_CDP;
mnemonic = "CDP";
opcode_1 = (opcode & 0x00f00000) >> 20;
snprintf(instruction->text,
128,
"0x%8.8" PRIx32 "\t0x%8.8" PRIx32 "\t%s%s p%i, 0x%2.2x, c%i, c%i, c%i, 0x%2.2x",
address,
opcode,
mnemonic,
cond,
cp_num,
opcode_1,
CRd_Rd,
CRn,
CRm,
opcode_2);
}
return ERROR_OK;
}
/* Load/store instructions */
static int evaluate_load_store(uint32_t opcode,
uint32_t address, struct arm_instruction *instruction)
{
uint8_t I, P, U, B, W, L;
uint8_t Rn, Rd;
char *operation;/* "LDR" or "STR" */
char *suffix; /* "", "B", "T", "BT" */
char offset[32];
/* examine flags */
I = (opcode & 0x02000000) >> 25;
P = (opcode & 0x01000000) >> 24;
U = (opcode & 0x00800000) >> 23;
B = (opcode & 0x00400000) >> 22;
W = (opcode & 0x00200000) >> 21;
L = (opcode & 0x00100000) >> 20;
/* target register */
Rd = (opcode & 0xf000) >> 12;
/* base register */
Rn = (opcode & 0xf0000) >> 16;
instruction->info.load_store.Rd = Rd;
instruction->info.load_store.Rn = Rn;
instruction->info.load_store.U = U;
/* determine operation */
if (L)
operation = "LDR";
else
operation = "STR";
/* determine instruction type and suffix */
if (B) {
if ((P == 0) && (W == 1)) {
if (L)
instruction->type = ARM_LDRBT;
else
instruction->type = ARM_STRBT;
suffix = "BT";
} else {
if (L)
instruction->type = ARM_LDRB;
else
instruction->type = ARM_STRB;
suffix = "B";
}
} else {
if ((P == 0) && (W == 1)) {
if (L)
instruction->type = ARM_LDRT;
else
instruction->type = ARM_STRT;
suffix = "T";
} else {
if (L)
instruction->type = ARM_LDR;
else
instruction->type = ARM_STR;
suffix = "";
}
}
if (!I) { /* #+-<offset_12> */
uint32_t offset_12 = (opcode & 0xfff);
if (offset_12)
snprintf(offset, 32, ", #%s0x%" PRIx32 "", (U) ? "" : "-", offset_12);
else
snprintf(offset, 32, "%s", "");
instruction->info.load_store.offset_mode = 0;
instruction->info.load_store.offset.offset = offset_12;
} else {/* either +-<Rm> or +-<Rm>, <shift>, #<shift_imm> */
uint8_t shift_imm, shift;
uint8_t Rm;
shift_imm = (opcode & 0xf80) >> 7;
shift = (opcode & 0x60) >> 5;
Rm = (opcode & 0xf);
/* LSR encodes a shift by 32 bit as 0x0 */
if ((shift == 0x1) && (shift_imm == 0x0))
shift_imm = 0x20;
/* ASR encodes a shift by 32 bit as 0x0 */
if ((shift == 0x2) && (shift_imm == 0x0))
shift_imm = 0x20;
/* ROR by 32 bit is actually a RRX */
if ((shift == 0x3) && (shift_imm == 0x0))
shift = 0x4;
instruction->info.load_store.offset_mode = 1;
instruction->info.load_store.offset.reg.Rm = Rm;
instruction->info.load_store.offset.reg.shift = shift;
instruction->info.load_store.offset.reg.shift_imm = shift_imm;
if ((shift_imm == 0x0) && (shift == 0x0)) /* +-<Rm> */
snprintf(offset, 32, ", %sr%i", (U) ? "" : "-", Rm);
else { /* +-<Rm>, <Shift>, #<shift_imm> */
switch (shift) {
case 0x0: /* LSL */
snprintf(offset, 32, ", %sr%i, LSL #0x%x", (U) ? "" : "-", Rm, shift_imm);
break;
case 0x1: /* LSR */
snprintf(offset, 32, ", %sr%i, LSR #0x%x", (U) ? "" : "-", Rm, shift_imm);
break;
case 0x2: /* ASR */
snprintf(offset, 32, ", %sr%i, ASR #0x%x", (U) ? "" : "-", Rm, shift_imm);
break;
case 0x3: /* ROR */
snprintf(offset, 32, ", %sr%i, ROR #0x%x", (U) ? "" : "-", Rm, shift_imm);
break;
case 0x4: /* RRX */
snprintf(offset, 32, ", %sr%i, RRX", (U) ? "" : "-", Rm);
break;
}
}
}
if (P == 1) {
if (W == 0) { /* offset */
snprintf(instruction->text,
128,
"0x%8.8" PRIx32 "\t0x%8.8" PRIx32 "\t%s%s%s r%i, [r%i%s]",
address,
opcode,
operation,
COND(opcode),
suffix,
Rd,
Rn,
offset);
instruction->info.load_store.index_mode = 0;
} else {/* pre-indexed */
snprintf(instruction->text,
128,
"0x%8.8" PRIx32 "\t0x%8.8" PRIx32 "\t%s%s%s r%i, [r%i%s]!",
address,
opcode,
operation,
COND(opcode),
suffix,
Rd,
Rn,
offset);
instruction->info.load_store.index_mode = 1;
}
} else {/* post-indexed */
snprintf(instruction->text,
128,
"0x%8.8" PRIx32 "\t0x%8.8" PRIx32 "\t%s%s%s r%i, [r%i]%s",
address,
opcode,
operation,
COND(opcode),
suffix,
Rd,
Rn,
offset);
instruction->info.load_store.index_mode = 2;
}
return ERROR_OK;
}
static int evaluate_extend(uint32_t opcode, uint32_t address, char *cp)
{
unsigned rm = (opcode >> 0) & 0xf;
unsigned rd = (opcode >> 12) & 0xf;
unsigned rn = (opcode >> 16) & 0xf;
char *type, *rot;
switch ((opcode >> 24) & 0x3) {
case 0:
type = "B16";
break;
case 1:
sprintf(cp, "UNDEFINED");
return ARM_UNDEFINED_INSTRUCTION;
case 2:
type = "B";
break;
default:
type = "H";
break;
}
switch ((opcode >> 10) & 0x3) {
case 0:
rot = "";
break;
case 1:
rot = ", ROR #8";
break;
case 2:
rot = ", ROR #16";
break;
default:
rot = ", ROR #24";
break;
}
if (rn == 0xf) {
sprintf(cp, "%cXT%s%s\tr%d, r%d%s",
(opcode & (1 << 22)) ? 'U' : 'S',
type, COND(opcode),
rd, rm, rot);
return ARM_MOV;
} else {
sprintf(cp, "%cXTA%s%s\tr%d, r%d, r%d%s",
(opcode & (1 << 22)) ? 'U' : 'S',
type, COND(opcode),
rd, rn, rm, rot);
return ARM_ADD;
}
}
static int evaluate_p_add_sub(uint32_t opcode, uint32_t address, char *cp)
{
char *prefix;
char *op;
int type;
switch ((opcode >> 20) & 0x7) {
case 1:
prefix = "S";
break;
case 2:
prefix = "Q";
break;
case 3:
prefix = "SH";
break;
case 5:
prefix = "U";
break;
case 6:
prefix = "UQ";
break;
case 7:
prefix = "UH";
break;
default:
goto undef;
}
switch ((opcode >> 5) & 0x7) {
case 0:
op = "ADD16";
type = ARM_ADD;
break;
case 1:
op = "ADDSUBX";
type = ARM_ADD;
break;
case 2:
op = "SUBADDX";
type = ARM_SUB;
break;
case 3:
op = "SUB16";
type = ARM_SUB;
break;
case 4:
op = "ADD8";
type = ARM_ADD;
break;
case 7:
op = "SUB8";
type = ARM_SUB;
break;
default:
goto undef;
}
sprintf(cp, "%s%s%s\tr%d, r%d, r%d", prefix, op, COND(opcode),
(int) (opcode >> 12) & 0xf,
(int) (opcode >> 16) & 0xf,
(int) (opcode >> 0) & 0xf);
return type;
undef:
/* these opcodes might be used someday */
sprintf(cp, "UNDEFINED");
return ARM_UNDEFINED_INSTRUCTION;
}
/* ARMv6 and later support "media" instructions (includes SIMD) */
static int evaluate_media(uint32_t opcode, uint32_t address,
struct arm_instruction *instruction)
{
char *cp = instruction->text;
char *mnemonic = NULL;
sprintf(cp,
"0x%8.8" PRIx32 "\t0x%8.8" PRIx32 "\t",
address, opcode);
cp = strchr(cp, 0);
/* parallel add/subtract */
if ((opcode & 0x01800000) == 0x00000000) {
instruction->type = evaluate_p_add_sub(opcode, address, cp);
return ERROR_OK;
}
/* halfword pack */
if ((opcode & 0x01f00020) == 0x00800000) {
char *type, *shift;
unsigned imm = (unsigned) (opcode >> 7) & 0x1f;
if (opcode & (1 << 6)) {
type = "TB";
shift = "ASR";
if (imm == 0)
imm = 32;
} else {
type = "BT";
shift = "LSL";
}
sprintf(cp, "PKH%s%s\tr%d, r%d, r%d, %s #%d",
type, COND(opcode),
(int) (opcode >> 12) & 0xf,
(int) (opcode >> 16) & 0xf,
(int) (opcode >> 0) & 0xf,
shift, imm);
return ERROR_OK;
}
/* word saturate */
if ((opcode & 0x01a00020) == 0x00a00000) {
char *shift;
unsigned imm = (unsigned) (opcode >> 7) & 0x1f;
if (opcode & (1 << 6)) {
shift = "ASR";
if (imm == 0)
imm = 32;
} else
shift = "LSL";
sprintf(cp, "%cSAT%s\tr%d, #%d, r%d, %s #%d",
(opcode & (1 << 22)) ? 'U' : 'S',
COND(opcode),
(int) (opcode >> 12) & 0xf,
(int) (opcode >> 16) & 0x1f,
(int) (opcode >> 0) & 0xf,
shift, imm);
return ERROR_OK;
}
/* sign extension */
if ((opcode & 0x018000f0) == 0x00800070) {
instruction->type = evaluate_extend(opcode, address, cp);
return ERROR_OK;
}
/* multiplies */
if ((opcode & 0x01f00080) == 0x01000000) {
unsigned rn = (opcode >> 12) & 0xf;
if (rn != 0xf)
sprintf(cp, "SML%cD%s%s\tr%d, r%d, r%d, r%d",
(opcode & (1 << 6)) ? 'S' : 'A',
(opcode & (1 << 5)) ? "X" : "",
COND(opcode),
(int) (opcode >> 16) & 0xf,
(int) (opcode >> 0) & 0xf,
(int) (opcode >> 8) & 0xf,
rn);
else
sprintf(cp, "SMU%cD%s%s\tr%d, r%d, r%d",
(opcode & (1 << 6)) ? 'S' : 'A',
(opcode & (1 << 5)) ? "X" : "",
COND(opcode),
(int) (opcode >> 16) & 0xf,
(int) (opcode >> 0) & 0xf,
(int) (opcode >> 8) & 0xf);
return ERROR_OK;
}
if ((opcode & 0x01f00000) == 0x01400000) {
sprintf(cp, "SML%cLD%s%s\tr%d, r%d, r%d, r%d",
(opcode & (1 << 6)) ? 'S' : 'A',
(opcode & (1 << 5)) ? "X" : "",
COND(opcode),
(int) (opcode >> 12) & 0xf,
(int) (opcode >> 16) & 0xf,
(int) (opcode >> 0) & 0xf,
(int) (opcode >> 8) & 0xf);
return ERROR_OK;
}
if ((opcode & 0x01f00000) == 0x01500000) {
unsigned rn = (opcode >> 12) & 0xf;
switch (opcode & 0xc0) {
case 3:
if (rn == 0xf)
goto undef;
/* FALL THROUGH */
case 0:
break;
default:
goto undef;
}
if (rn != 0xf)
sprintf(cp, "SMML%c%s%s\tr%d, r%d, r%d, r%d",
(opcode & (1 << 6)) ? 'S' : 'A',
(opcode & (1 << 5)) ? "R" : "",
COND(opcode),
(int) (opcode >> 16) & 0xf,
(int) (opcode >> 0) & 0xf,
(int) (opcode >> 8) & 0xf,
rn);
else
sprintf(cp, "SMMUL%s%s\tr%d, r%d, r%d",
(opcode & (1 << 5)) ? "R" : "",
COND(opcode),
(int) (opcode >> 16) & 0xf,
(int) (opcode >> 0) & 0xf,
(int) (opcode >> 8) & 0xf);
return ERROR_OK;
}
/* simple matches against the remaining decode bits */
switch (opcode & 0x01f000f0) {
case 0x00a00030:
case 0x00e00030:
/* parallel halfword saturate */
sprintf(cp, "%cSAT16%s\tr%d, #%d, r%d",
(opcode & (1 << 22)) ? 'U' : 'S',
COND(opcode),
(int) (opcode >> 12) & 0xf,
(int) (opcode >> 16) & 0xf,
(int) (opcode >> 0) & 0xf);
return ERROR_OK;
case 0x00b00030:
mnemonic = "REV";
break;
case 0x00b000b0:
mnemonic = "REV16";
break;
case 0x00f000b0:
mnemonic = "REVSH";
break;
case 0x008000b0:
/* select bytes */
sprintf(cp, "SEL%s\tr%d, r%d, r%d", COND(opcode),
(int) (opcode >> 12) & 0xf,
(int) (opcode >> 16) & 0xf,
(int) (opcode >> 0) & 0xf);
return ERROR_OK;
case 0x01800010:
/* unsigned sum of absolute differences */
if (((opcode >> 12) & 0xf) == 0xf)
sprintf(cp, "USAD8%s\tr%d, r%d, r%d", COND(opcode),
(int) (opcode >> 16) & 0xf,
(int) (opcode >> 0) & 0xf,
(int) (opcode >> 8) & 0xf);
else
sprintf(cp, "USADA8%s\tr%d, r%d, r%d, r%d", COND(opcode),
(int) (opcode >> 16) & 0xf,
(int) (opcode >> 0) & 0xf,
(int) (opcode >> 8) & 0xf,
(int) (opcode >> 12) & 0xf);
return ERROR_OK;
}
if (mnemonic) {
unsigned rm = (opcode >> 0) & 0xf;
unsigned rd = (opcode >> 12) & 0xf;
sprintf(cp, "%s%s\tr%d, r%d", mnemonic, COND(opcode), rm, rd);
return ERROR_OK;
}
undef:
/* these opcodes might be used someday */
sprintf(cp, "UNDEFINED");
return ERROR_OK;
}
/* Miscellaneous load/store instructions */
static int evaluate_misc_load_store(uint32_t opcode,
uint32_t address, struct arm_instruction *instruction)
{
uint8_t P, U, I, W, L, S, H;
uint8_t Rn, Rd;
char *operation;/* "LDR" or "STR" */
char *suffix; /* "H", "SB", "SH", "D" */
char offset[32];
/* examine flags */
P = (opcode & 0x01000000) >> 24;
U = (opcode & 0x00800000) >> 23;
I = (opcode & 0x00400000) >> 22;
W = (opcode & 0x00200000) >> 21;
L = (opcode & 0x00100000) >> 20;
S = (opcode & 0x00000040) >> 6;
H = (opcode & 0x00000020) >> 5;
/* target register */
Rd = (opcode & 0xf000) >> 12;
/* base register */
Rn = (opcode & 0xf0000) >> 16;
instruction->info.load_store.Rd = Rd;
instruction->info.load_store.Rn = Rn;
instruction->info.load_store.U = U;
/* determine instruction type and suffix */
if (S) {/* signed */
if (L) {/* load */
if (H) {
operation = "LDR";
instruction->type = ARM_LDRSH;
suffix = "SH";
} else {
operation = "LDR";
instruction->type = ARM_LDRSB;
suffix = "SB";
}
} else {/* there are no signed stores, so this is used to encode double-register
*load/stores */
suffix = "D";
if (H) {
operation = "STR";
instruction->type = ARM_STRD;
} else {
operation = "LDR";
instruction->type = ARM_LDRD;
}
}
} else {/* unsigned */
suffix = "H";
if (L) {/* load */
operation = "LDR";
instruction->type = ARM_LDRH;
} else {/* store */
operation = "STR";
instruction->type = ARM_STRH;
}
}
if (I) {/* Immediate offset/index (#+-<offset_8>)*/
uint32_t offset_8 = ((opcode & 0xf00) >> 4) | (opcode & 0xf);
snprintf(offset, 32, "#%s0x%" PRIx32 "", (U) ? "" : "-", offset_8);
instruction->info.load_store.offset_mode = 0;
instruction->info.load_store.offset.offset = offset_8;
} else {/* Register offset/index (+-<Rm>) */
uint8_t Rm;
Rm = (opcode & 0xf);
snprintf(offset, 32, "%sr%i", (U) ? "" : "-", Rm);
instruction->info.load_store.offset_mode = 1;
instruction->info.load_store.offset.reg.Rm = Rm;
instruction->info.load_store.offset.reg.shift = 0x0;
instruction->info.load_store.offset.reg.shift_imm = 0x0;
}
if (P == 1) {
if (W == 0) { /* offset */
snprintf(instruction->text,
128,
"0x%8.8" PRIx32 "\t0x%8.8" PRIx32 "\t%s%s%s r%i, [r%i, %s]",
address,
opcode,
operation,
COND(opcode),
suffix,
Rd,
Rn,
offset);
instruction->info.load_store.index_mode = 0;
} else {/* pre-indexed */
snprintf(instruction->text,
128,
"0x%8.8" PRIx32 "\t0x%8.8" PRIx32 "\t%s%s%s r%i, [r%i, %s]!",
address,
opcode,
operation,
COND(opcode),
suffix,
Rd,
Rn,
offset);
instruction->info.load_store.index_mode = 1;
}
} else {/* post-indexed */
snprintf(instruction->text,
128,
"0x%8.8" PRIx32 "\t0x%8.8" PRIx32 "\t%s%s%s r%i, [r%i], %s",
address,
opcode,
operation,
COND(opcode),
suffix,
Rd,
Rn,
offset);
instruction->info.load_store.index_mode = 2;
}
return ERROR_OK;
}
/* Load/store multiples instructions */
static int evaluate_ldm_stm(uint32_t opcode,
uint32_t address, struct arm_instruction *instruction)
{
uint8_t P, U, S, W, L, Rn;
uint32_t register_list;
char *addressing_mode;
char *mnemonic;
char reg_list[69];
char *reg_list_p;
int i;
int first_reg = 1;
P = (opcode & 0x01000000) >> 24;
U = (opcode & 0x00800000) >> 23;
S = (opcode & 0x00400000) >> 22;
W = (opcode & 0x00200000) >> 21;
L = (opcode & 0x00100000) >> 20;
register_list = (opcode & 0xffff);
Rn = (opcode & 0xf0000) >> 16;
instruction->info.load_store_multiple.Rn = Rn;
instruction->info.load_store_multiple.register_list = register_list;
instruction->info.load_store_multiple.S = S;
instruction->info.load_store_multiple.W = W;
if (L) {
instruction->type = ARM_LDM;
mnemonic = "LDM";
} else {
instruction->type = ARM_STM;
mnemonic = "STM";
}
if (P) {
if (U) {
instruction->info.load_store_multiple.addressing_mode = 1;
addressing_mode = "IB";
} else {
instruction->info.load_store_multiple.addressing_mode = 3;
addressing_mode = "DB";
}
} else {
if (U) {
instruction->info.load_store_multiple.addressing_mode = 0;
/* "IA" is the default in UAL syntax */
addressing_mode = "";
} else {
instruction->info.load_store_multiple.addressing_mode = 2;
addressing_mode = "DA";
}
}
reg_list_p = reg_list;
for (i = 0; i <= 15; i++) {
if ((register_list >> i) & 1) {
if (first_reg) {
first_reg = 0;
reg_list_p += snprintf(reg_list_p,
(reg_list + 69 - reg_list_p),
"r%i",
i);
} else
reg_list_p += snprintf(reg_list_p,
(reg_list + 69 - reg_list_p),
", r%i",
i);
}
}
snprintf(instruction->text, 128,
"0x%8.8" PRIx32 "\t0x%8.8" PRIx32
"\t%s%s%s r%i%s, {%s}%s",
address, opcode,
mnemonic, addressing_mode, COND(opcode),
Rn, (W) ? "!" : "", reg_list, (S) ? "^" : "");
return ERROR_OK;
}
/* Multiplies, extra load/stores */
static int evaluate_mul_and_extra_ld_st(uint32_t opcode,
uint32_t address, struct arm_instruction *instruction)
{
/* Multiply (accumulate) (long) and Swap/swap byte */
if ((opcode & 0x000000f0) == 0x00000090) {
/* Multiply (accumulate) */
if ((opcode & 0x0f800000) == 0x00000000) {
uint8_t Rm, Rs, Rn, Rd, S;
Rm = opcode & 0xf;
Rs = (opcode & 0xf00) >> 8;
Rn = (opcode & 0xf000) >> 12;
Rd = (opcode & 0xf0000) >> 16;
S = (opcode & 0x00100000) >> 20;
/* examine A bit (accumulate) */
if (opcode & 0x00200000) {
instruction->type = ARM_MLA;
snprintf(instruction->text,
128,
"0x%8.8" PRIx32 "\t0x%8.8" PRIx32 "\tMLA%s%s r%i, r%i, r%i, r%i",
address,
opcode,
COND(opcode),
(S) ? "S" : "",
Rd,
Rm,
Rs,
Rn);
} else {
instruction->type = ARM_MUL;
snprintf(instruction->text,
128,
"0x%8.8" PRIx32 "\t0x%8.8" PRIx32 "\tMUL%s%s r%i, r%i, r%i",
address,
opcode,
COND(opcode),
(S) ? "S" : "",
Rd,
Rm,
Rs);
}
return ERROR_OK;
}
/* Multiply (accumulate) long */
if ((opcode & 0x0f800000) == 0x00800000) {
char *mnemonic = NULL;
uint8_t Rm, Rs, RdHi, RdLow, S;
Rm = opcode & 0xf;
Rs = (opcode & 0xf00) >> 8;
RdHi = (opcode & 0xf000) >> 12;
RdLow = (opcode & 0xf0000) >> 16;
S = (opcode & 0x00100000) >> 20;
switch ((opcode & 0x00600000) >> 21) {
case 0x0:
instruction->type = ARM_UMULL;
mnemonic = "UMULL";
break;
case 0x1:
instruction->type = ARM_UMLAL;
mnemonic = "UMLAL";
break;
case 0x2:
instruction->type = ARM_SMULL;
mnemonic = "SMULL";
break;
case 0x3:
instruction->type = ARM_SMLAL;
mnemonic = "SMLAL";
break;
}
snprintf(instruction->text,
128,
"0x%8.8" PRIx32 "\t0x%8.8" PRIx32 "\t%s%s%s r%i, r%i, r%i, r%i",
address,
opcode,
mnemonic,
COND(opcode),
(S) ? "S" : "",
RdLow,
RdHi,
Rm,
Rs);
return ERROR_OK;
}
/* Swap/swap byte */
if ((opcode & 0x0f800000) == 0x01000000) {
uint8_t Rm, Rd, Rn;
Rm = opcode & 0xf;
Rd = (opcode & 0xf000) >> 12;
Rn = (opcode & 0xf0000) >> 16;
/* examine B flag */
instruction->type = (opcode & 0x00400000) ? ARM_SWPB : ARM_SWP;
snprintf(instruction->text,
128,
"0x%8.8" PRIx32 "\t0x%8.8" PRIx32 "\t%s%s r%i, r%i, [r%i]",
address,
opcode,
(opcode & 0x00400000) ? "SWPB" : "SWP",
COND(opcode),
Rd,
Rm,
Rn);
return ERROR_OK;
}
}
return evaluate_misc_load_store(opcode, address, instruction);
}
static int evaluate_mrs_msr(uint32_t opcode,
uint32_t address, struct arm_instruction *instruction)
{
int R = (opcode & 0x00400000) >> 22;
char *PSR = (R) ? "SPSR" : "CPSR";
/* Move register to status register (MSR) */
if (opcode & 0x00200000) {
instruction->type = ARM_MSR;
/* immediate variant */
if (opcode & 0x02000000) {
uint8_t immediate = (opcode & 0xff);
uint8_t rotate = (opcode & 0xf00);
snprintf(instruction->text,
128,
"0x%8.8" PRIx32 "\t0x%8.8" PRIx32 "\tMSR%s %s_%s%s%s%s, 0x%8.8" PRIx32,
address,
opcode,
COND(opcode),
PSR,
(opcode & 0x10000) ? "c" : "",
(opcode & 0x20000) ? "x" : "",
(opcode & 0x40000) ? "s" : "",
(opcode & 0x80000) ? "f" : "",
ror(immediate, (rotate * 2))
);
} else {/* register variant */
uint8_t Rm = opcode & 0xf;
snprintf(instruction->text,
128,
"0x%8.8" PRIx32 "\t0x%8.8" PRIx32 "\tMSR%s %s_%s%s%s%s, r%i",
address,
opcode,
COND(opcode),
PSR,
(opcode & 0x10000) ? "c" : "",
(opcode & 0x20000) ? "x" : "",
(opcode & 0x40000) ? "s" : "",
(opcode & 0x80000) ? "f" : "",
Rm
);
}
} else {/* Move status register to register (MRS) */
uint8_t Rd;
instruction->type = ARM_MRS;
Rd = (opcode & 0x0000f000) >> 12;
snprintf(instruction->text,
128,
"0x%8.8" PRIx32 "\t0x%8.8" PRIx32 "\tMRS%s r%i, %s",
address,
opcode,
COND(opcode),
Rd,
PSR);
}
return ERROR_OK;
}
/* Miscellaneous instructions */
static int evaluate_misc_instr(uint32_t opcode,
uint32_t address, struct arm_instruction *instruction)
{
/* MRS/MSR */
if ((opcode & 0x000000f0) == 0x00000000)
evaluate_mrs_msr(opcode, address, instruction);
/* BX */
if ((opcode & 0x006000f0) == 0x00200010) {
uint8_t Rm;
instruction->type = ARM_BX;
Rm = opcode & 0xf;
snprintf(instruction->text, 128, "0x%8.8" PRIx32 "\t0x%8.8" PRIx32 "\tBX%s r%i",
address, opcode, COND(opcode), Rm);
instruction->info.b_bl_bx_blx.reg_operand = Rm;
instruction->info.b_bl_bx_blx.target_address = -1;
}
/* BXJ - "Jazelle" support (ARMv5-J) */
if ((opcode & 0x006000f0) == 0x00200020) {
uint8_t Rm;
instruction->type = ARM_BX;
Rm = opcode & 0xf;
snprintf(instruction->text, 128,
"0x%8.8" PRIx32 "\t0x%8.8" PRIx32 "\tBXJ%s r%i",
address, opcode, COND(opcode), Rm);
instruction->info.b_bl_bx_blx.reg_operand = Rm;
instruction->info.b_bl_bx_blx.target_address = -1;
}
/* CLZ */
if ((opcode & 0x006000f0) == 0x00600010) {
uint8_t Rm, Rd;
instruction->type = ARM_CLZ;
Rm = opcode & 0xf;
Rd = (opcode & 0xf000) >> 12;
snprintf(instruction->text,
128,
"0x%8.8" PRIx32 "\t0x%8.8" PRIx32 "\tCLZ%s r%i, r%i",
address,
opcode,
COND(opcode),
Rd,
Rm);
}
/* BLX(2) */
if ((opcode & 0x006000f0) == 0x00200030) {
uint8_t Rm;
instruction->type = ARM_BLX;
Rm = opcode & 0xf;
snprintf(instruction->text, 128, "0x%8.8" PRIx32 "\t0x%8.8" PRIx32 "\tBLX%s r%i",
address, opcode, COND(opcode), Rm);
instruction->info.b_bl_bx_blx.reg_operand = Rm;
instruction->info.b_bl_bx_blx.target_address = -1;
}
/* Enhanced DSP add/subtracts */
if ((opcode & 0x0000000f0) == 0x00000050) {
uint8_t Rm, Rd, Rn;
char *mnemonic = NULL;
Rm = opcode & 0xf;
Rd = (opcode & 0xf000) >> 12;
Rn = (opcode & 0xf0000) >> 16;
switch ((opcode & 0x00600000) >> 21) {
case 0x0:
instruction->type = ARM_QADD;
mnemonic = "QADD";
break;
case 0x1:
instruction->type = ARM_QSUB;
mnemonic = "QSUB";
break;
case 0x2:
instruction->type = ARM_QDADD;
mnemonic = "QDADD";
break;
case 0x3:
instruction->type = ARM_QDSUB;
mnemonic = "QDSUB";
break;
}
snprintf(instruction->text,
128,
"0x%8.8" PRIx32 "\t0x%8.8" PRIx32 "\t%s%s r%i, r%i, r%i",
address,
opcode,
mnemonic,
COND(opcode),
Rd,
Rm,
Rn);
}
/* exception return */
if ((opcode & 0x0000000f0) == 0x00000060) {
if (((opcode & 0x600000) >> 21) == 3)
instruction->type = ARM_ERET;
snprintf(instruction->text,
128,
"0x%8.8" PRIx32 "\t0x%8.8" PRIx32 "\tERET",
address,
opcode);
}
/* exception generate instructions */
if ((opcode & 0x0000000f0) == 0x00000070) {
uint32_t immediate = 0;
char *mnemonic = NULL;
switch ((opcode & 0x600000) >> 21) {
case 0x1:
instruction->type = ARM_BKPT;
mnemonic = "BRKT";
immediate = ((opcode & 0x000fff00) >> 4) | (opcode & 0xf);
break;
case 0x2:
instruction->type = ARM_HVC;
mnemonic = "HVC";
immediate = ((opcode & 0x000fff00) >> 4) | (opcode & 0xf);
break;
case 0x3:
instruction->type = ARM_SMC;
mnemonic = "SMC";
immediate = (opcode & 0xf);
break;
}
snprintf(instruction->text,
128,
"0x%8.8" PRIx32 "\t0x%8.8" PRIx32 "\t%s 0x%4.4" PRIx32 "",
address,
opcode,
mnemonic,
immediate);
}
/* Enhanced DSP multiplies */
if ((opcode & 0x000000090) == 0x00000080) {
int x = (opcode & 0x20) >> 5;
int y = (opcode & 0x40) >> 6;
/* SMLA < x><y> */
if ((opcode & 0x00600000) == 0x00000000) {
uint8_t Rd, Rm, Rs, Rn;
instruction->type = ARM_SMLAxy;
Rd = (opcode & 0xf0000) >> 16;
Rm = (opcode & 0xf);
Rs = (opcode & 0xf00) >> 8;
Rn = (opcode & 0xf000) >> 12;
snprintf(instruction->text,
128,
"0x%8.8" PRIx32 "\t0x%8.8" PRIx32 "\tSMLA%s%s%s r%i, r%i, r%i, r%i",
address,
opcode,
(x) ? "T" : "B",
(y) ? "T" : "B",
COND(opcode),
Rd,
Rm,
Rs,
Rn);
}
/* SMLAL < x><y> */
if ((opcode & 0x00600000) == 0x00400000) {
uint8_t RdLow, RdHi, Rm, Rs;
instruction->type = ARM_SMLAxy;
RdHi = (opcode & 0xf0000) >> 16;
RdLow = (opcode & 0xf000) >> 12;
Rm = (opcode & 0xf);
Rs = (opcode & 0xf00) >> 8;
snprintf(instruction->text,
128,
"0x%8.8" PRIx32 "\t0x%8.8" PRIx32 "\tSMLA%s%s%s r%i, r%i, r%i, r%i",
address,
opcode,
(x) ? "T" : "B",
(y) ? "T" : "B",
COND(opcode),
RdLow,
RdHi,
Rm,
Rs);
}
/* SMLAW < y> */
if (((opcode & 0x00600000) == 0x00100000) && (x == 0)) {
uint8_t Rd, Rm, Rs, Rn;
instruction->type = ARM_SMLAWy;
Rd = (opcode & 0xf0000) >> 16;
Rm = (opcode & 0xf);
Rs = (opcode & 0xf00) >> 8;
Rn = (opcode & 0xf000) >> 12;
snprintf(instruction->text,
128,
"0x%8.8" PRIx32 "\t0x%8.8" PRIx32 "\tSMLAW%s%s r%i, r%i, r%i, r%i",
address,
opcode,
(y) ? "T" : "B",
COND(opcode),
Rd,
Rm,
Rs,
Rn);
}
/* SMUL < x><y> */
if ((opcode & 0x00600000) == 0x00300000) {
uint8_t Rd, Rm, Rs;
instruction->type = ARM_SMULxy;
Rd = (opcode & 0xf0000) >> 16;
Rm = (opcode & 0xf);
Rs = (opcode & 0xf00) >> 8;
snprintf(instruction->text,
128,
"0x%8.8" PRIx32 "\t0x%8.8" PRIx32 "\tSMULW%s%s%s r%i, r%i, r%i",
address,
opcode,
(x) ? "T" : "B",
(y) ? "T" : "B",
COND(opcode),
Rd,
Rm,
Rs);
}
/* SMULW < y> */
if (((opcode & 0x00600000) == 0x00100000) && (x == 1)) {
uint8_t Rd, Rm, Rs;
instruction->type = ARM_SMULWy;
Rd = (opcode & 0xf0000) >> 16;
Rm = (opcode & 0xf);
Rs = (opcode & 0xf00) >> 8;
snprintf(instruction->text,
128,
"0x%8.8" PRIx32 "\t0x%8.8" PRIx32 "\tSMULW%s%s r%i, r%i, r%i",
address,
opcode,
(y) ? "T" : "B",
COND(opcode),
Rd,
Rm,
Rs);
}
}
return ERROR_OK;
}
static int evaluate_data_proc(uint32_t opcode,
uint32_t address, struct arm_instruction *instruction)
{
uint8_t I, op, S, Rn, Rd;
char *mnemonic = NULL;
char shifter_operand[32];
I = (opcode & 0x02000000) >> 25;
op = (opcode & 0x01e00000) >> 21;
S = (opcode & 0x00100000) >> 20;
Rd = (opcode & 0xf000) >> 12;
Rn = (opcode & 0xf0000) >> 16;
instruction->info.data_proc.Rd = Rd;
instruction->info.data_proc.Rn = Rn;
instruction->info.data_proc.S = S;
switch (op) {
case 0x0:
instruction->type = ARM_AND;
mnemonic = "AND";
break;
case 0x1:
instruction->type = ARM_EOR;
mnemonic = "EOR";
break;
case 0x2:
instruction->type = ARM_SUB;
mnemonic = "SUB";
break;
case 0x3:
instruction->type = ARM_RSB;
mnemonic = "RSB";
break;
case 0x4:
instruction->type = ARM_ADD;
mnemonic = "ADD";
break;
case 0x5:
instruction->type = ARM_ADC;
mnemonic = "ADC";
break;
case 0x6:
instruction->type = ARM_SBC;
mnemonic = "SBC";
break;
case 0x7:
instruction->type = ARM_RSC;
mnemonic = "RSC";
break;
case 0x8:
instruction->type = ARM_TST;
mnemonic = "TST";
break;
case 0x9:
instruction->type = ARM_TEQ;
mnemonic = "TEQ";
break;
case 0xa:
instruction->type = ARM_CMP;
mnemonic = "CMP";
break;
case 0xb:
instruction->type = ARM_CMN;
mnemonic = "CMN";
break;
case 0xc:
instruction->type = ARM_ORR;
mnemonic = "ORR";
break;
case 0xd:
instruction->type = ARM_MOV;
mnemonic = "MOV";
break;
case 0xe:
instruction->type = ARM_BIC;
mnemonic = "BIC";
break;
case 0xf:
instruction->type = ARM_MVN;
mnemonic = "MVN";
break;
}
if (I) {/* immediate shifter operand (#<immediate>)*/
uint8_t immed_8 = opcode & 0xff;
uint8_t rotate_imm = (opcode & 0xf00) >> 8;
uint32_t immediate;
immediate = ror(immed_8, rotate_imm * 2);
snprintf(shifter_operand, 32, "#0x%" PRIx32 "", immediate);
instruction->info.data_proc.variant = 0;
instruction->info.data_proc.shifter_operand.immediate.immediate = immediate;
} else {/* register-based shifter operand */
uint8_t shift, Rm;
shift = (opcode & 0x60) >> 5;
Rm = (opcode & 0xf);
if ((opcode & 0x10) != 0x10) { /* Immediate shifts ("<Rm>" or "<Rm>, <shift>
*#<shift_immediate>") */
uint8_t shift_imm;
shift_imm = (opcode & 0xf80) >> 7;
instruction->info.data_proc.variant = 1;
instruction->info.data_proc.shifter_operand.immediate_shift.Rm = Rm;
instruction->info.data_proc.shifter_operand.immediate_shift.shift_imm =
shift_imm;
instruction->info.data_proc.shifter_operand.immediate_shift.shift = shift;
/* LSR encodes a shift by 32 bit as 0x0 */
if ((shift == 0x1) && (shift_imm == 0x0))
shift_imm = 0x20;
/* ASR encodes a shift by 32 bit as 0x0 */
if ((shift == 0x2) && (shift_imm == 0x0))
shift_imm = 0x20;
/* ROR by 32 bit is actually a RRX */
if ((shift == 0x3) && (shift_imm == 0x0))
shift = 0x4;
if ((shift_imm == 0x0) && (shift == 0x0))
snprintf(shifter_operand, 32, "r%i", Rm);
else {
if (shift == 0x0) /* LSL */
snprintf(shifter_operand,
32,
"r%i, LSL #0x%x",
Rm,
shift_imm);
else if (shift == 0x1) /* LSR */
snprintf(shifter_operand,
32,
"r%i, LSR #0x%x",
Rm,
shift_imm);
else if (shift == 0x2) /* ASR */
snprintf(shifter_operand,
32,
"r%i, ASR #0x%x",
Rm,
shift_imm);
else if (shift == 0x3) /* ROR */
snprintf(shifter_operand,
32,
"r%i, ROR #0x%x",
Rm,
shift_imm);
else if (shift == 0x4) /* RRX */
snprintf(shifter_operand, 32, "r%i, RRX", Rm);
}
} else {/* Register shifts ("<Rm>, <shift> <Rs>") */
uint8_t Rs = (opcode & 0xf00) >> 8;
instruction->info.data_proc.variant = 2;
instruction->info.data_proc.shifter_operand.register_shift.Rm = Rm;
instruction->info.data_proc.shifter_operand.register_shift.Rs = Rs;
instruction->info.data_proc.shifter_operand.register_shift.shift = shift;
if (shift == 0x0) /* LSL */
snprintf(shifter_operand, 32, "r%i, LSL r%i", Rm, Rs);
else if (shift == 0x1) /* LSR */
snprintf(shifter_operand, 32, "r%i, LSR r%i", Rm, Rs);
else if (shift == 0x2) /* ASR */
snprintf(shifter_operand, 32, "r%i, ASR r%i", Rm, Rs);
else if (shift == 0x3) /* ROR */
snprintf(shifter_operand, 32, "r%i, ROR r%i", Rm, Rs);
}
}
if ((op < 0x8) || (op == 0xc) || (op == 0xe)) { /* <opcode3>{<cond>}{S} <Rd>, <Rn>,
*<shifter_operand> */
snprintf(instruction->text,
128,
"0x%8.8" PRIx32 "\t0x%8.8" PRIx32 "\t%s%s%s r%i, r%i, %s",
address,
opcode,
mnemonic,
COND(opcode),
(S) ? "S" : "",
Rd,
Rn,
shifter_operand);
} else if ((op == 0xd) || (op == 0xf)) { /* <opcode1>{<cond>}{S} <Rd>,
*<shifter_operand> */
if (opcode == 0xe1a00000) /* print MOV r0,r0 as NOP */
snprintf(instruction->text,
128,
"0x%8.8" PRIx32 "\t0x%8.8" PRIx32 "\tNOP",
address,
opcode);
else
snprintf(instruction->text,
128,
"0x%8.8" PRIx32 "\t0x%8.8" PRIx32 "\t%s%s%s r%i, %s",
address,
opcode,
mnemonic,
COND(opcode),
(S) ? "S" : "",
Rd,
shifter_operand);
} else {/* <opcode2>{<cond>} <Rn>, <shifter_operand> */
snprintf(instruction->text, 128, "0x%8.8" PRIx32 "\t0x%8.8" PRIx32 "\t%s%s r%i, %s",
address, opcode, mnemonic, COND(opcode),
Rn, shifter_operand);
}
return ERROR_OK;
}
int arm_evaluate_opcode(uint32_t opcode, uint32_t address,
struct arm_instruction *instruction)
{
/* clear fields, to avoid confusion */
memset(instruction, 0, sizeof(struct arm_instruction));
instruction->opcode = opcode;
instruction->instruction_size = 4;
/* catch opcodes with condition field [31:28] = b1111 */
if ((opcode & 0xf0000000) == 0xf0000000) {
/* Undefined instruction (or ARMv5E cache preload PLD) */
if ((opcode & 0x08000000) == 0x00000000)
return evaluate_pld(opcode, address, instruction);
/* Undefined instruction (or ARMv6+ SRS/RFE) */
if ((opcode & 0x0e000000) == 0x08000000)
return evaluate_srs(opcode, address, instruction);
/* Branch and branch with link and change to Thumb */
if ((opcode & 0x0e000000) == 0x0a000000)
return evaluate_blx_imm(opcode, address, instruction);
/* Extended coprocessor opcode space (ARMv5 and higher)
* Coprocessor load/store and double register transfers */
if ((opcode & 0x0e000000) == 0x0c000000)
return evaluate_ldc_stc_mcrr_mrrc(opcode, address, instruction);
/* Coprocessor data processing */
if ((opcode & 0x0f000100) == 0x0c000000)
return evaluate_cdp_mcr_mrc(opcode, address, instruction);
/* Coprocessor register transfers */
if ((opcode & 0x0f000010) == 0x0c000010)
return evaluate_cdp_mcr_mrc(opcode, address, instruction);
/* Undefined instruction */
if ((opcode & 0x0f000000) == 0x0f000000) {
instruction->type = ARM_UNDEFINED_INSTRUCTION;
snprintf(instruction->text,
128,
"0x%8.8" PRIx32 "\t0x%8.8" PRIx32 "\tUNDEFINED INSTRUCTION",
address,
opcode);
return ERROR_OK;
}
}
/* catch opcodes with [27:25] = b000 */
if ((opcode & 0x0e000000) == 0x00000000) {
/* Multiplies, extra load/stores */
if ((opcode & 0x00000090) == 0x00000090)
return evaluate_mul_and_extra_ld_st(opcode, address, instruction);
/* Miscellaneous instructions */
if ((opcode & 0x0f900000) == 0x01000000)
return evaluate_misc_instr(opcode, address, instruction);
return evaluate_data_proc(opcode, address, instruction);
}
/* catch opcodes with [27:25] = b001 */
if ((opcode & 0x0e000000) == 0x02000000) {
/* Undefined instruction */
if ((opcode & 0x0fb00000) == 0x03000000) {
instruction->type = ARM_UNDEFINED_INSTRUCTION;
snprintf(instruction->text,
128,
"0x%8.8" PRIx32 "\t0x%8.8" PRIx32 "\tUNDEFINED INSTRUCTION",
address,
opcode);
return ERROR_OK;
}
/* Move immediate to status register */
if ((opcode & 0x0fb00000) == 0x03200000)
return evaluate_mrs_msr(opcode, address, instruction);
return evaluate_data_proc(opcode, address, instruction);
}
/* catch opcodes with [27:25] = b010 */
if ((opcode & 0x0e000000) == 0x04000000) {
/* Load/store immediate offset */
return evaluate_load_store(opcode, address, instruction);
}
/* catch opcodes with [27:25] = b011 */
if ((opcode & 0x0e000000) == 0x06000000) {
/* Load/store register offset */
if ((opcode & 0x00000010) == 0x00000000)
return evaluate_load_store(opcode, address, instruction);
/* Architecturally Undefined instruction
* ... don't expect these to ever be used
*/
if ((opcode & 0x07f000f0) == 0x07f000f0) {
instruction->type = ARM_UNDEFINED_INSTRUCTION;
snprintf(instruction->text, 128,
"0x%8.8" PRIx32 "\t0x%8.8" PRIx32 "\tUNDEF",
address, opcode);
return ERROR_OK;
}
/* "media" instructions */
return evaluate_media(opcode, address, instruction);
}
/* catch opcodes with [27:25] = b100 */
if ((opcode & 0x0e000000) == 0x08000000) {
/* Load/store multiple */
return evaluate_ldm_stm(opcode, address, instruction);
}
/* catch opcodes with [27:25] = b101 */
if ((opcode & 0x0e000000) == 0x0a000000) {
/* Branch and branch with link */
return evaluate_b_bl(opcode, address, instruction);
}
/* catch opcodes with [27:25] = b110 */
if ((opcode & 0x0e000000) == 0x0c000000) {
/* Coprocessor load/store and double register transfers */
return evaluate_ldc_stc_mcrr_mrrc(opcode, address, instruction);
}
/* catch opcodes with [27:25] = b111 */
if ((opcode & 0x0e000000) == 0x0e000000) {
/* Software interrupt */
if ((opcode & 0x0f000000) == 0x0f000000)
return evaluate_swi(opcode, address, instruction);
/* Coprocessor data processing */
if ((opcode & 0x0f000010) == 0x0e000000)
return evaluate_cdp_mcr_mrc(opcode, address, instruction);
/* Coprocessor register transfers */
if ((opcode & 0x0f000010) == 0x0e000010)
return evaluate_cdp_mcr_mrc(opcode, address, instruction);
}
LOG_ERROR("ARM: should never reach this point (opcode=%08x)",
(unsigned) opcode);
return -1;
}
static int evaluate_b_bl_blx_thumb(uint16_t opcode,
uint32_t address, struct arm_instruction *instruction)
{
uint32_t offset = opcode & 0x7ff;
uint32_t opc = (opcode >> 11) & 0x3;
uint32_t target_address;
char *mnemonic = NULL;
/* sign extend 11-bit offset */
if (((opc == 0) || (opc == 2)) && (offset & 0x00000400))
offset = 0xfffff800 | offset;
target_address = address + 4 + (offset << 1);
switch (opc) {
/* unconditional branch */
case 0:
instruction->type = ARM_B;
mnemonic = "B";
break;
/* BLX suffix */
case 1:
instruction->type = ARM_BLX;
mnemonic = "BLX";
target_address &= 0xfffffffc;
break;
/* BL/BLX prefix */
case 2:
instruction->type = ARM_UNKNOWN_INSTUCTION;
mnemonic = "prefix";
target_address = offset << 12;
break;
/* BL suffix */
case 3:
instruction->type = ARM_BL;
mnemonic = "BL";
break;
}
/* TODO: deal correctly with dual opcode (prefixed) BL/BLX;
* these are effectively 32-bit instructions even in Thumb1. For
* disassembly, it's simplest to always use the Thumb2 decoder.
*
* But some cores will evidently handle them as two instructions,
* where exceptions may occur between the two. The ETMv3.2+ ID
* register has a bit which exposes this behavior.
*/
snprintf(instruction->text, 128,
"0x%8.8" PRIx32 " 0x%4.4x \t%s\t%#8.8" PRIx32,
address, opcode, mnemonic, target_address);
instruction->info.b_bl_bx_blx.reg_operand = -1;
instruction->info.b_bl_bx_blx.target_address = target_address;
return ERROR_OK;
}
static int evaluate_add_sub_thumb(uint16_t opcode,
uint32_t address, struct arm_instruction *instruction)
{
uint8_t Rd = (opcode >> 0) & 0x7;
uint8_t Rn = (opcode >> 3) & 0x7;
uint8_t Rm_imm = (opcode >> 6) & 0x7;
uint32_t opc = opcode & (1 << 9);
uint32_t reg_imm = opcode & (1 << 10);
char *mnemonic;
if (opc) {
instruction->type = ARM_SUB;
mnemonic = "SUBS";
} else {
/* REVISIT: if reg_imm == 0, display as "MOVS" */
instruction->type = ARM_ADD;
mnemonic = "ADDS";
}
instruction->info.data_proc.Rd = Rd;
instruction->info.data_proc.Rn = Rn;
instruction->info.data_proc.S = 1;
if (reg_imm) {
instruction->info.data_proc.variant = 0;/*immediate*/
instruction->info.data_proc.shifter_operand.immediate.immediate = Rm_imm;
snprintf(instruction->text, 128,
"0x%8.8" PRIx32 " 0x%4.4x \t%s\tr%i, r%i, #%d",
address, opcode, mnemonic, Rd, Rn, Rm_imm);
} else {
instruction->info.data_proc.variant = 1;/*immediate shift*/
instruction->info.data_proc.shifter_operand.immediate_shift.Rm = Rm_imm;
snprintf(instruction->text, 128,
"0x%8.8" PRIx32 " 0x%4.4x \t%s\tr%i, r%i, r%i",
address, opcode, mnemonic, Rd, Rn, Rm_imm);
}
return ERROR_OK;
}
static int evaluate_shift_imm_thumb(uint16_t opcode,
uint32_t address, struct arm_instruction *instruction)
{
uint8_t Rd = (opcode >> 0) & 0x7;
uint8_t Rm = (opcode >> 3) & 0x7;
uint8_t imm = (opcode >> 6) & 0x1f;
uint8_t opc = (opcode >> 11) & 0x3;
char *mnemonic = NULL;
switch (opc) {
case 0:
instruction->type = ARM_MOV;
mnemonic = "LSLS";
instruction->info.data_proc.shifter_operand.immediate_shift.shift = 0;
break;
case 1:
instruction->type = ARM_MOV;
mnemonic = "LSRS";
instruction->info.data_proc.shifter_operand.immediate_shift.shift = 1;
break;
case 2:
instruction->type = ARM_MOV;
mnemonic = "ASRS";
instruction->info.data_proc.shifter_operand.immediate_shift.shift = 2;
break;
}
if ((imm == 0) && (opc != 0))
imm = 32;
instruction->info.data_proc.Rd = Rd;
instruction->info.data_proc.Rn = -1;
instruction->info.data_proc.S = 1;
instruction->info.data_proc.variant = 1;/*immediate_shift*/
instruction->info.data_proc.shifter_operand.immediate_shift.Rm = Rm;
instruction->info.data_proc.shifter_operand.immediate_shift.shift_imm = imm;
snprintf(instruction->text, 128,
"0x%8.8" PRIx32 " 0x%4.4x \t%s\tr%i, r%i, #%#2.2x",
address, opcode, mnemonic, Rd, Rm, imm);
return ERROR_OK;
}
static int evaluate_data_proc_imm_thumb(uint16_t opcode,
uint32_t address, struct arm_instruction *instruction)
{
uint8_t imm = opcode & 0xff;
uint8_t Rd = (opcode >> 8) & 0x7;
uint32_t opc = (opcode >> 11) & 0x3;
char *mnemonic = NULL;
instruction->info.data_proc.Rd = Rd;
instruction->info.data_proc.Rn = Rd;
instruction->info.data_proc.S = 1;
instruction->info.data_proc.variant = 0;/*immediate*/
instruction->info.data_proc.shifter_operand.immediate.immediate = imm;
switch (opc) {
case 0:
instruction->type = ARM_MOV;
mnemonic = "MOVS";
instruction->info.data_proc.Rn = -1;
break;
case 1:
instruction->type = ARM_CMP;
mnemonic = "CMP";
instruction->info.data_proc.Rd = -1;
break;
case 2:
instruction->type = ARM_ADD;
mnemonic = "ADDS";
break;
case 3:
instruction->type = ARM_SUB;
mnemonic = "SUBS";
break;
}
snprintf(instruction->text, 128,
"0x%8.8" PRIx32 " 0x%4.4x \t%s\tr%i, #%#2.2x",
address, opcode, mnemonic, Rd, imm);
return ERROR_OK;
}
static int evaluate_data_proc_thumb(uint16_t opcode,
uint32_t address, struct arm_instruction *instruction)
{
uint8_t high_reg, op, Rm, Rd, H1, H2;
char *mnemonic = NULL;
bool nop = false;
high_reg = (opcode & 0x0400) >> 10;
op = (opcode & 0x03C0) >> 6;
Rd = (opcode & 0x0007);
Rm = (opcode & 0x0038) >> 3;
H1 = (opcode & 0x0080) >> 7;
H2 = (opcode & 0x0040) >> 6;
instruction->info.data_proc.Rd = Rd;
instruction->info.data_proc.Rn = Rd;
instruction->info.data_proc.S = (!high_reg || (instruction->type == ARM_CMP));
instruction->info.data_proc.variant = 1 /*immediate shift*/;
instruction->info.data_proc.shifter_operand.immediate_shift.Rm = Rm;
if (high_reg) {
Rd |= H1 << 3;
Rm |= H2 << 3;
op >>= 2;
switch (op) {
case 0x0:
instruction->type = ARM_ADD;
mnemonic = "ADD";
break;
case 0x1:
instruction->type = ARM_CMP;
mnemonic = "CMP";
break;
case 0x2:
instruction->type = ARM_MOV;
mnemonic = "MOV";
if (Rd == Rm)
nop = true;
break;
case 0x3:
if ((opcode & 0x7) == 0x0) {
instruction->info.b_bl_bx_blx.reg_operand = Rm;
if (H1) {
instruction->type = ARM_BLX;
snprintf(instruction->text, 128,
"0x%8.8" PRIx32
" 0x%4.4x \tBLX\tr%i",
address, opcode, Rm);
} else {
instruction->type = ARM_BX;
snprintf(instruction->text, 128,
"0x%8.8" PRIx32
" 0x%4.4x \tBX\tr%i",
address, opcode, Rm);
}
} else {
instruction->type = ARM_UNDEFINED_INSTRUCTION;
snprintf(instruction->text, 128,
"0x%8.8" PRIx32
" 0x%4.4x \t"
"UNDEFINED INSTRUCTION",
address, opcode);
}
return ERROR_OK;
break;
}
} else {
switch (op) {
case 0x0:
instruction->type = ARM_AND;
mnemonic = "ANDS";
break;
case 0x1:
instruction->type = ARM_EOR;
mnemonic = "EORS";
break;
case 0x2:
instruction->type = ARM_MOV;
mnemonic = "LSLS";
instruction->info.data_proc.variant = 2 /*register shift*/;
instruction->info.data_proc.shifter_operand.register_shift.shift = 0;
instruction->info.data_proc.shifter_operand.register_shift.Rm = Rd;
instruction->info.data_proc.shifter_operand.register_shift.Rs = Rm;
break;
case 0x3:
instruction->type = ARM_MOV;
mnemonic = "LSRS";
instruction->info.data_proc.variant = 2 /*register shift*/;
instruction->info.data_proc.shifter_operand.register_shift.shift = 1;
instruction->info.data_proc.shifter_operand.register_shift.Rm = Rd;
instruction->info.data_proc.shifter_operand.register_shift.Rs = Rm;
break;
case 0x4:
instruction->type = ARM_MOV;
mnemonic = "ASRS";
instruction->info.data_proc.variant = 2 /*register shift*/;
instruction->info.data_proc.shifter_operand.register_shift.shift = 2;
instruction->info.data_proc.shifter_operand.register_shift.Rm = Rd;
instruction->info.data_proc.shifter_operand.register_shift.Rs = Rm;
break;
case 0x5:
instruction->type = ARM_ADC;
mnemonic = "ADCS";
break;
case 0x6:
instruction->type = ARM_SBC;
mnemonic = "SBCS";
break;
case 0x7:
instruction->type = ARM_MOV;
mnemonic = "RORS";
instruction->info.data_proc.variant = 2 /*register shift*/;
instruction->info.data_proc.shifter_operand.register_shift.shift = 3;
instruction->info.data_proc.shifter_operand.register_shift.Rm = Rd;
instruction->info.data_proc.shifter_operand.register_shift.Rs = Rm;
break;
case 0x8:
instruction->type = ARM_TST;
mnemonic = "TST";
break;
case 0x9:
instruction->type = ARM_RSB;
mnemonic = "RSBS";
instruction->info.data_proc.variant = 0 /*immediate*/;
instruction->info.data_proc.shifter_operand.immediate.immediate = 0;
instruction->info.data_proc.Rn = Rm;
break;
case 0xA:
instruction->type = ARM_CMP;
mnemonic = "CMP";
break;
case 0xB:
instruction->type = ARM_CMN;
mnemonic = "CMN";
break;
case 0xC:
instruction->type = ARM_ORR;
mnemonic = "ORRS";
break;
case 0xD:
instruction->type = ARM_MUL;
mnemonic = "MULS";
break;
case 0xE:
instruction->type = ARM_BIC;
mnemonic = "BICS";
break;
case 0xF:
instruction->type = ARM_MVN;
mnemonic = "MVNS";
break;
}
}
if (nop)
snprintf(instruction->text, 128,
"0x%8.8" PRIx32 " 0x%4.4x \tNOP\t\t\t"
"; (%s r%i, r%i)",
address, opcode, mnemonic, Rd, Rm);
else
snprintf(instruction->text, 128,
"0x%8.8" PRIx32 " 0x%4.4x \t%s\tr%i, r%i",
address, opcode, mnemonic, Rd, Rm);
return ERROR_OK;
}
/* PC-relative data addressing is word-aligned even with Thumb */
static inline uint32_t thumb_alignpc4(uint32_t addr)
{
return (addr + 4) & ~3;
}
static int evaluate_load_literal_thumb(uint16_t opcode,
uint32_t address, struct arm_instruction *instruction)
{
uint32_t immediate;
uint8_t Rd = (opcode >> 8) & 0x7;
instruction->type = ARM_LDR;
immediate = opcode & 0x000000ff;
immediate *= 4;
instruction->info.load_store.Rd = Rd;
instruction->info.load_store.Rn = 15 /*PC*/;
instruction->info.load_store.index_mode = 0; /*offset*/
instruction->info.load_store.offset_mode = 0; /*immediate*/
instruction->info.load_store.offset.offset = immediate;
snprintf(instruction->text, 128,
"0x%8.8" PRIx32 " 0x%4.4x \t"
"LDR\tr%i, [pc, #%#" PRIx32 "]\t; %#8.8" PRIx32,
address, opcode, Rd, immediate,
thumb_alignpc4(address) + immediate);
return ERROR_OK;
}
static int evaluate_load_store_reg_thumb(uint16_t opcode,
uint32_t address, struct arm_instruction *instruction)
{
uint8_t Rd = (opcode >> 0) & 0x7;
uint8_t Rn = (opcode >> 3) & 0x7;
uint8_t Rm = (opcode >> 6) & 0x7;
uint8_t opc = (opcode >> 9) & 0x7;
char *mnemonic = NULL;
switch (opc) {
case 0:
instruction->type = ARM_STR;
mnemonic = "STR";
break;
case 1:
instruction->type = ARM_STRH;
mnemonic = "STRH";
break;
case 2:
instruction->type = ARM_STRB;
mnemonic = "STRB";
break;
case 3:
instruction->type = ARM_LDRSB;
mnemonic = "LDRSB";
break;
case 4:
instruction->type = ARM_LDR;
mnemonic = "LDR";
break;
case 5:
instruction->type = ARM_LDRH;
mnemonic = "LDRH";
break;
case 6:
instruction->type = ARM_LDRB;
mnemonic = "LDRB";
break;
case 7:
instruction->type = ARM_LDRSH;
mnemonic = "LDRSH";
break;
}
snprintf(instruction->text, 128,
"0x%8.8" PRIx32 " 0x%4.4x \t%s\tr%i, [r%i, r%i]",
address, opcode, mnemonic, Rd, Rn, Rm);
instruction->info.load_store.Rd = Rd;
instruction->info.load_store.Rn = Rn;
instruction->info.load_store.index_mode = 0; /*offset*/
instruction->info.load_store.offset_mode = 1; /*register*/
instruction->info.load_store.offset.reg.Rm = Rm;
return ERROR_OK;
}
static int evaluate_load_store_imm_thumb(uint16_t opcode,
uint32_t address, struct arm_instruction *instruction)
{
uint32_t offset = (opcode >> 6) & 0x1f;
uint8_t Rd = (opcode >> 0) & 0x7;
uint8_t Rn = (opcode >> 3) & 0x7;
uint32_t L = opcode & (1 << 11);
uint32_t B = opcode & (1 << 12);
char *mnemonic;
char suffix = ' ';
uint32_t shift = 2;
if (L) {
instruction->type = ARM_LDR;
mnemonic = "LDR";
} else {
instruction->type = ARM_STR;
mnemonic = "STR";
}
if ((opcode&0xF000) == 0x8000) {
suffix = 'H';
shift = 1;
} else if (B) {
suffix = 'B';
shift = 0;
}
snprintf(instruction->text, 128,
"0x%8.8" PRIx32 " 0x%4.4x \t%s%c\tr%i, [r%i, #%#" PRIx32 "]",
address, opcode, mnemonic, suffix, Rd, Rn, offset << shift);
instruction->info.load_store.Rd = Rd;
instruction->info.load_store.Rn = Rn;
instruction->info.load_store.index_mode = 0; /*offset*/
instruction->info.load_store.offset_mode = 0; /*immediate*/
instruction->info.load_store.offset.offset = offset << shift;
return ERROR_OK;
}
static int evaluate_load_store_stack_thumb(uint16_t opcode,
uint32_t address, struct arm_instruction *instruction)
{
uint32_t offset = opcode & 0xff;
uint8_t Rd = (opcode >> 8) & 0x7;
uint32_t L = opcode & (1 << 11);
char *mnemonic;
if (L) {
instruction->type = ARM_LDR;
mnemonic = "LDR";
} else {
instruction->type = ARM_STR;
mnemonic = "STR";
}
snprintf(instruction->text, 128,
"0x%8.8" PRIx32 " 0x%4.4x \t%s\tr%i, [SP, #%#" PRIx32 "]",
address, opcode, mnemonic, Rd, offset*4);
instruction->info.load_store.Rd = Rd;
instruction->info.load_store.Rn = 13 /*SP*/;
instruction->info.load_store.index_mode = 0; /*offset*/
instruction->info.load_store.offset_mode = 0; /*immediate*/
instruction->info.load_store.offset.offset = offset*4;
return ERROR_OK;
}
static int evaluate_add_sp_pc_thumb(uint16_t opcode,
uint32_t address, struct arm_instruction *instruction)
{
uint32_t imm = opcode & 0xff;
uint8_t Rd = (opcode >> 8) & 0x7;
uint8_t Rn;
uint32_t SP = opcode & (1 << 11);
const char *reg_name;
instruction->type = ARM_ADD;
if (SP) {
reg_name = "SP";
Rn = 13;
} else {
reg_name = "PC";
Rn = 15;
}
snprintf(instruction->text, 128,
"0x%8.8" PRIx32 " 0x%4.4x \tADD\tr%i, %s, #%#" PRIx32,
address, opcode, Rd, reg_name, imm * 4);
instruction->info.data_proc.variant = 0 /* immediate */;
instruction->info.data_proc.Rd = Rd;
instruction->info.data_proc.Rn = Rn;
instruction->info.data_proc.shifter_operand.immediate.immediate = imm*4;
return ERROR_OK;
}
static int evaluate_adjust_stack_thumb(uint16_t opcode,
uint32_t address, struct arm_instruction *instruction)
{
uint32_t imm = opcode & 0x7f;
uint8_t opc = opcode & (1 << 7);
char *mnemonic;
if (opc) {
instruction->type = ARM_SUB;
mnemonic = "SUB";
} else {
instruction->type = ARM_ADD;
mnemonic = "ADD";
}
snprintf(instruction->text, 128,
"0x%8.8" PRIx32 " 0x%4.4x \t%s\tSP, #%#" PRIx32,
address, opcode, mnemonic, imm*4);
instruction->info.data_proc.variant = 0 /* immediate */;
instruction->info.data_proc.Rd = 13 /*SP*/;
instruction->info.data_proc.Rn = 13 /*SP*/;
instruction->info.data_proc.shifter_operand.immediate.immediate = imm*4;
return ERROR_OK;
}
static int evaluate_breakpoint_thumb(uint16_t opcode,
uint32_t address, struct arm_instruction *instruction)
{
uint32_t imm = opcode & 0xff;
instruction->type = ARM_BKPT;
snprintf(instruction->text, 128,
"0x%8.8" PRIx32 " 0x%4.4x \tBKPT\t%#2.2" PRIx32 "",
address, opcode, imm);
return ERROR_OK;
}
static int evaluate_load_store_multiple_thumb(uint16_t opcode,
uint32_t address, struct arm_instruction *instruction)
{
uint32_t reg_list = opcode & 0xff;
uint32_t L = opcode & (1 << 11);
uint32_t R = opcode & (1 << 8);
uint8_t Rn = (opcode >> 8) & 7;
uint8_t addr_mode = 0 /* IA */;
char reg_names[40];
char *reg_names_p;
char *mnemonic;
char ptr_name[7] = "";
int i;
/* REVISIT: in ThumbEE mode, there are no LDM or STM instructions.
* The STMIA and LDMIA opcodes are used for other instructions.
*/
if ((opcode & 0xf000) == 0xc000) { /* generic load/store multiple */
char *wback = "!";
if (L) {
instruction->type = ARM_LDM;
mnemonic = "LDM";
if (opcode & (1 << Rn))
wback = "";
} else {
instruction->type = ARM_STM;
mnemonic = "STM";
}
snprintf(ptr_name, sizeof ptr_name, "r%i%s, ", Rn, wback);
} else {/* push/pop */
Rn = 13;/* SP */
if (L) {
instruction->type = ARM_LDM;
mnemonic = "POP";
if (R)
reg_list |= (1 << 15) /*PC*/;
} else {
instruction->type = ARM_STM;
mnemonic = "PUSH";
addr_mode = 3; /*DB*/
if (R)
reg_list |= (1 << 14) /*LR*/;
}
}
reg_names_p = reg_names;
for (i = 0; i <= 15; i++) {
if (reg_list & (1 << i))
reg_names_p += snprintf(reg_names_p,
(reg_names + 40 - reg_names_p),
"r%i, ",
i);
}
if (reg_names_p > reg_names)
reg_names_p[-2] = '\0';
else /* invalid op : no registers */
reg_names[0] = '\0';
snprintf(instruction->text, 128,
"0x%8.8" PRIx32 " 0x%4.4x \t%s\t%s{%s}",
address, opcode, mnemonic, ptr_name, reg_names);
instruction->info.load_store_multiple.register_list = reg_list;
instruction->info.load_store_multiple.Rn = Rn;
instruction->info.load_store_multiple.addressing_mode = addr_mode;
return ERROR_OK;
}
static int evaluate_cond_branch_thumb(uint16_t opcode,
uint32_t address, struct arm_instruction *instruction)
{
uint32_t offset = opcode & 0xff;
uint8_t cond = (opcode >> 8) & 0xf;
uint32_t target_address;
if (cond == 0xf) {
instruction->type = ARM_SWI;
snprintf(instruction->text, 128,
"0x%8.8" PRIx32 " 0x%4.4x \tSVC\t%#2.2" PRIx32,
address, opcode, offset);
return ERROR_OK;
} else if (cond == 0xe) {
instruction->type = ARM_UNDEFINED_INSTRUCTION;
snprintf(instruction->text, 128,
"0x%8.8" PRIx32 " 0x%4.4x \tUNDEFINED INSTRUCTION",
address, opcode);
return ERROR_OK;
}
/* sign extend 8-bit offset */
if (offset & 0x00000080)
offset = 0xffffff00 | offset;
target_address = address + 4 + (offset << 1);
snprintf(instruction->text, 128,
"0x%8.8" PRIx32 " 0x%4.4x \tB%s\t%#8.8" PRIx32,
address, opcode,
arm_condition_strings[cond], target_address);
instruction->type = ARM_B;
instruction->info.b_bl_bx_blx.reg_operand = -1;
instruction->info.b_bl_bx_blx.target_address = target_address;
return ERROR_OK;
}
static int evaluate_cb_thumb(uint16_t opcode, uint32_t address,
struct arm_instruction *instruction)
{
unsigned offset;
/* added in Thumb2 */
offset = (opcode >> 3) & 0x1f;
offset |= (opcode & 0x0200) >> 4;
snprintf(instruction->text, 128,
"0x%8.8" PRIx32 " 0x%4.4x \tCB%sZ\tr%d, %#8.8" PRIx32,
address, opcode,
(opcode & 0x0800) ? "N" : "",
opcode & 0x7, address + 4 + (offset << 1));
return ERROR_OK;
}
static int evaluate_extend_thumb(uint16_t opcode, uint32_t address,
struct arm_instruction *instruction)
{
/* added in ARMv6 */
snprintf(instruction->text, 128,
"0x%8.8" PRIx32 " 0x%4.4x \t%cXT%c\tr%d, r%d",
address, opcode,
(opcode & 0x0080) ? 'U' : 'S',
(opcode & 0x0040) ? 'B' : 'H',
opcode & 0x7, (opcode >> 3) & 0x7);
return ERROR_OK;
}
static int evaluate_cps_thumb(uint16_t opcode, uint32_t address,
struct arm_instruction *instruction)
{
/* added in ARMv6 */
if ((opcode & 0x0ff0) == 0x0650)
snprintf(instruction->text, 128,
"0x%8.8" PRIx32 " 0x%4.4x \tSETEND %s",
address, opcode,
(opcode & 0x80) ? "BE" : "LE");
else /* ASSUME (opcode & 0x0fe0) == 0x0660 */
snprintf(instruction->text, 128,
"0x%8.8" PRIx32 " 0x%4.4x \tCPSI%c\t%s%s%s",
address, opcode,
(opcode & 0x0010) ? 'D' : 'E',
(opcode & 0x0004) ? "A" : "",
(opcode & 0x0002) ? "I" : "",
(opcode & 0x0001) ? "F" : "");
return ERROR_OK;
}
static int evaluate_byterev_thumb(uint16_t opcode, uint32_t address,
struct arm_instruction *instruction)
{
char *suffix;
/* added in ARMv6 */
switch ((opcode >> 6) & 3) {
case 0:
suffix = "";
break;
case 1:
suffix = "16";
break;
default:
suffix = "SH";
break;
}
snprintf(instruction->text, 128,
"0x%8.8" PRIx32 " 0x%4.4x \tREV%s\tr%d, r%d",
address, opcode, suffix,
opcode & 0x7, (opcode >> 3) & 0x7);
return ERROR_OK;
}
static int evaluate_hint_thumb(uint16_t opcode, uint32_t address,
struct arm_instruction *instruction)
{
char *hint;
switch ((opcode >> 4) & 0x0f) {
case 0:
hint = "NOP";
break;
case 1:
hint = "YIELD";
break;
case 2:
hint = "WFE";
break;
case 3:
hint = "WFI";
break;
case 4:
hint = "SEV";
break;
default:
hint = "HINT (UNRECOGNIZED)";
break;
}
snprintf(instruction->text, 128,
"0x%8.8" PRIx32 " 0x%4.4x \t%s",
address, opcode, hint);
return ERROR_OK;
}
static int evaluate_ifthen_thumb(uint16_t opcode, uint32_t address,
struct arm_instruction *instruction)
{
unsigned cond = (opcode >> 4) & 0x0f;
char *x = "", *y = "", *z = "";
if (opcode & 0x01)
z = (opcode & 0x02) ? "T" : "E";
if (opcode & 0x03)
y = (opcode & 0x04) ? "T" : "E";
if (opcode & 0x07)
x = (opcode & 0x08) ? "T" : "E";
snprintf(instruction->text, 128,
"0x%8.8" PRIx32 " 0x%4.4x \tIT%s%s%s\t%s",
address, opcode,
x, y, z, arm_condition_strings[cond]);
/* NOTE: strictly speaking, the next 1-4 instructions should
* now be displayed with the relevant conditional suffix...
*/
return ERROR_OK;
}
int thumb_evaluate_opcode(uint16_t opcode, uint32_t address, struct arm_instruction *instruction)
{
/* clear fields, to avoid confusion */
memset(instruction, 0, sizeof(struct arm_instruction));
instruction->opcode = opcode;
instruction->instruction_size = 2;
if ((opcode & 0xe000) == 0x0000) {
/* add/substract register or immediate */
if ((opcode & 0x1800) == 0x1800)
return evaluate_add_sub_thumb(opcode, address, instruction);
/* shift by immediate */
else
return evaluate_shift_imm_thumb(opcode, address, instruction);
}
/* Add/substract/compare/move immediate */
if ((opcode & 0xe000) == 0x2000)
return evaluate_data_proc_imm_thumb(opcode, address, instruction);
/* Data processing instructions */
if ((opcode & 0xf800) == 0x4000)
return evaluate_data_proc_thumb(opcode, address, instruction);
/* Load from literal pool */
if ((opcode & 0xf800) == 0x4800)
return evaluate_load_literal_thumb(opcode, address, instruction);
/* Load/Store register offset */
if ((opcode & 0xf000) == 0x5000)
return evaluate_load_store_reg_thumb(opcode, address, instruction);
/* Load/Store immediate offset */
if (((opcode & 0xe000) == 0x6000)
|| ((opcode & 0xf000) == 0x8000))
return evaluate_load_store_imm_thumb(opcode, address, instruction);
/* Load/Store from/to stack */
if ((opcode & 0xf000) == 0x9000)
return evaluate_load_store_stack_thumb(opcode, address, instruction);
/* Add to SP/PC */
if ((opcode & 0xf000) == 0xa000)
return evaluate_add_sp_pc_thumb(opcode, address, instruction);
/* Misc */
if ((opcode & 0xf000) == 0xb000) {
switch ((opcode >> 8) & 0x0f) {
case 0x0:
return evaluate_adjust_stack_thumb(opcode, address, instruction);
case 0x1:
case 0x3:
case 0x9:
case 0xb:
return evaluate_cb_thumb(opcode, address, instruction);
case 0x2:
return evaluate_extend_thumb(opcode, address, instruction);
case 0x4:
case 0x5:
case 0xc:
case 0xd:
return evaluate_load_store_multiple_thumb(opcode, address,
instruction);
case 0x6:
return evaluate_cps_thumb(opcode, address, instruction);
case 0xa:
if ((opcode & 0x00c0) == 0x0080)
break;
return evaluate_byterev_thumb(opcode, address, instruction);
case 0xe:
return evaluate_breakpoint_thumb(opcode, address, instruction);
case 0xf:
if (opcode & 0x000f)
return evaluate_ifthen_thumb(opcode, address,
instruction);
else
return evaluate_hint_thumb(opcode, address,
instruction);
}
instruction->type = ARM_UNDEFINED_INSTRUCTION;
snprintf(instruction->text, 128,
"0x%8.8" PRIx32 " 0x%4.4x \tUNDEFINED INSTRUCTION",
address, opcode);
return ERROR_OK;
}
/* Load/Store multiple */
if ((opcode & 0xf000) == 0xc000)
return evaluate_load_store_multiple_thumb(opcode, address, instruction);
/* Conditional branch + SWI */
if ((opcode & 0xf000) == 0xd000)
return evaluate_cond_branch_thumb(opcode, address, instruction);
if ((opcode & 0xe000) == 0xe000) {
/* Undefined instructions */
if ((opcode & 0xf801) == 0xe801) {
instruction->type = ARM_UNDEFINED_INSTRUCTION;
snprintf(instruction->text, 128,
"0x%8.8" PRIx32 " 0x%8.8x\t"
"UNDEFINED INSTRUCTION",
address, opcode);
return ERROR_OK;
} else /* Branch to offset */
return evaluate_b_bl_blx_thumb(opcode, address, instruction);
}
LOG_ERROR("Thumb: should never reach this point (opcode=%04x)", opcode);
return -1;
}
static int t2ev_b_bl(uint32_t opcode, uint32_t address,
struct arm_instruction *instruction, char *cp)
{
unsigned offset;
unsigned b21 = 1 << 21;
unsigned b22 = 1 << 22;
/* instead of combining two smaller 16-bit branch instructions,
* Thumb2 uses only one larger 32-bit instruction.
*/
offset = opcode & 0x7ff;
offset |= (opcode & 0x03ff0000) >> 5;
if (opcode & (1 << 26)) {
offset |= 0xff << 23;
if ((opcode & (1 << 11)) == 0)
b21 = 0;
if ((opcode & (1 << 13)) == 0)
b22 = 0;
} else {
if (opcode & (1 << 11))
b21 = 0;
if (opcode & (1 << 13))
b22 = 0;
}
offset |= b21;
offset |= b22;
address += 4;
address += offset << 1;
instruction->type = (opcode & (1 << 14)) ? ARM_BL : ARM_B;
instruction->info.b_bl_bx_blx.reg_operand = -1;
instruction->info.b_bl_bx_blx.target_address = address;
sprintf(cp, "%s\t%#8.8" PRIx32,
(opcode & (1 << 14)) ? "BL" : "B.W",
address);
return ERROR_OK;
}
static int t2ev_cond_b(uint32_t opcode, uint32_t address,
struct arm_instruction *instruction, char *cp)
{
unsigned offset;
unsigned b17 = 1 << 17;
unsigned b18 = 1 << 18;
unsigned cond = (opcode >> 22) & 0x0f;
offset = opcode & 0x7ff;
offset |= (opcode & 0x003f0000) >> 5;
if (opcode & (1 << 26)) {
offset |= 0x1fff << 19;
if ((opcode & (1 << 11)) == 0)
b17 = 0;
if ((opcode & (1 << 13)) == 0)
b18 = 0;
} else {
if (opcode & (1 << 11))
b17 = 0;
if (opcode & (1 << 13))
b18 = 0;
}
offset |= b17;
offset |= b18;
address += 4;
address += offset << 1;
instruction->type = ARM_B;
instruction->info.b_bl_bx_blx.reg_operand = -1;
instruction->info.b_bl_bx_blx.target_address = address;
sprintf(cp, "B%s.W\t%#8.8" PRIx32,
arm_condition_strings[cond],
address);
return ERROR_OK;
}
static const char *special_name(int number)
{
char *special = "(RESERVED)";
switch (number) {
case 0:
special = "apsr";
break;
case 1:
special = "iapsr";
break;
case 2:
special = "eapsr";
break;
case 3:
special = "xpsr";
break;
case 5:
special = "ipsr";
break;
case 6:
special = "epsr";
break;
case 7:
special = "iepsr";
break;
case 8:
special = "msp";
break;
case 9:
special = "psp";
break;
case 16:
special = "primask";
break;
case 17:
special = "basepri";
break;
case 18:
special = "basepri_max";
break;
case 19:
special = "faultmask";
break;
case 20:
special = "control";
break;
}
return special;
}
static int t2ev_hint(uint32_t opcode, uint32_t address,
struct arm_instruction *instruction, char *cp)
{
const char *mnemonic;
if (opcode & 0x0700) {
instruction->type = ARM_UNDEFINED_INSTRUCTION;
strcpy(cp, "UNDEFINED");
return ERROR_OK;
}
if (opcode & 0x00f0) {
sprintf(cp, "DBG\t#%d", (int) opcode & 0xf);
return ERROR_OK;
}
switch (opcode & 0x0f) {
case 0:
mnemonic = "NOP.W";
break;
case 1:
mnemonic = "YIELD.W";
break;
case 2:
mnemonic = "WFE.W";
break;
case 3:
mnemonic = "WFI.W";
break;
case 4:
mnemonic = "SEV.W";
break;
default:
mnemonic = "HINT.W (UNRECOGNIZED)";
break;
}
strcpy(cp, mnemonic);
return ERROR_OK;
}
static int t2ev_misc(uint32_t opcode, uint32_t address,
struct arm_instruction *instruction, char *cp)
{
const char *mnemonic;
switch ((opcode >> 4) & 0x0f) {
case 0:
mnemonic = "LEAVEX";
break;
case 1:
mnemonic = "ENTERX";
break;
case 2:
mnemonic = "CLREX";
break;
case 4:
mnemonic = "DSB";
break;
case 5:
mnemonic = "DMB";
break;
case 6:
mnemonic = "ISB";
break;
default:
return ERROR_COMMAND_SYNTAX_ERROR;
}
strcpy(cp, mnemonic);
return ERROR_OK;
}
static int t2ev_b_misc(uint32_t opcode, uint32_t address,
struct arm_instruction *instruction, char *cp)
{
/* permanently undefined */
if ((opcode & 0x07f07000) == 0x07f02000) {
instruction->type = ARM_UNDEFINED_INSTRUCTION;
strcpy(cp, "UNDEFINED");
return ERROR_OK;
}
switch ((opcode >> 12) & 0x5) {
case 0x1:
case 0x5:
return t2ev_b_bl(opcode, address, instruction, cp);
case 0x4:
goto undef;
case 0:
if (((opcode >> 23) & 0x07) != 0x07)
return t2ev_cond_b(opcode, address, instruction, cp);
if (opcode & (1 << 26))
goto undef;
break;
}
switch ((opcode >> 20) & 0x7f) {
case 0x38:
case 0x39:
sprintf(cp, "MSR\t%s, r%d", special_name(opcode & 0xff),
(int) (opcode >> 16) & 0x0f);
return ERROR_OK;
case 0x3a:
return t2ev_hint(opcode, address, instruction, cp);
case 0x3b:
return t2ev_misc(opcode, address, instruction, cp);
case 0x3c:
sprintf(cp, "BXJ\tr%d", (int) (opcode >> 16) & 0x0f);
return ERROR_OK;
case 0x3e:
case 0x3f:
sprintf(cp, "MRS\tr%d, %s", (int) (opcode >> 8) & 0x0f,
special_name(opcode & 0xff));
return ERROR_OK;
}
undef:
return ERROR_COMMAND_SYNTAX_ERROR;
}
static int t2ev_data_mod_immed(uint32_t opcode, uint32_t address,
struct arm_instruction *instruction, char *cp)
{
char *mnemonic = NULL;
int rn = (opcode >> 16) & 0xf;
int rd = (opcode >> 8) & 0xf;
unsigned immed = opcode & 0xff;
unsigned func;
bool one = false;
char *suffix = "";
char *suffix2 = "";
/* ARMv7-M: A5.3.2 Modified immediate constants */
func = (opcode >> 11) & 0x0e;
if (immed & 0x80)
func |= 1;
if (opcode & (1 << 26))
func |= 0x10;
/* "Modified" immediates */
switch (func >> 1) {
case 0:
break;
case 2:
immed <<= 8;
/* FALLTHROUGH */
case 1:
immed += immed << 16;
break;
case 3:
immed += immed << 8;
immed += immed << 16;
break;
default:
immed |= 0x80;
immed = ror(immed, func);
}
if (opcode & (1 << 20))
suffix = "S";
switch ((opcode >> 21) & 0xf) {
case 0:
if (rd == 0xf) {
instruction->type = ARM_TST;
mnemonic = "TST";
one = true;
suffix = "";
rd = rn;
} else {
instruction->type = ARM_AND;
mnemonic = "AND";
}
break;
case 1:
instruction->type = ARM_BIC;
mnemonic = "BIC";
break;
case 2:
if (rn == 0xf) {
instruction->type = ARM_MOV;
mnemonic = "MOV";
one = true;
suffix2 = ".W";
} else {
instruction->type = ARM_ORR;
mnemonic = "ORR";
}
break;
case 3:
if (rn == 0xf) {
instruction->type = ARM_MVN;
mnemonic = "MVN";
one = true;
} else {
/* instruction->type = ARM_ORN; */
mnemonic = "ORN";
}
break;
case 4:
if (rd == 0xf) {
instruction->type = ARM_TEQ;
mnemonic = "TEQ";
one = true;
suffix = "";
rd = rn;
} else {
instruction->type = ARM_EOR;
mnemonic = "EOR";
}
break;
case 8:
if (rd == 0xf) {
instruction->type = ARM_CMN;
mnemonic = "CMN";
one = true;
suffix = "";
rd = rn;
} else {
instruction->type = ARM_ADD;
mnemonic = "ADD";
suffix2 = ".W";
}
break;
case 10:
instruction->type = ARM_ADC;
mnemonic = "ADC";
suffix2 = ".W";
break;
case 11:
instruction->type = ARM_SBC;
mnemonic = "SBC";
break;
case 13:
if (rd == 0xf) {
instruction->type = ARM_CMP;
mnemonic = "CMP";
one = true;
suffix = "";
rd = rn;
} else {
instruction->type = ARM_SUB;
mnemonic = "SUB";
}
suffix2 = ".W";
break;
case 14:
instruction->type = ARM_RSB;
mnemonic = "RSB";
suffix2 = ".W";
break;
default:
return ERROR_COMMAND_SYNTAX_ERROR;
}
if (one)
sprintf(cp, "%s%s\tr%d, #%d\t; %#8.8x",
mnemonic, suffix2, rd, immed, immed);
else
sprintf(cp, "%s%s%s\tr%d, r%d, #%d\t; %#8.8x",
mnemonic, suffix, suffix2,
rd, rn, immed, immed);
return ERROR_OK;
}
static int t2ev_data_immed(uint32_t opcode, uint32_t address,
struct arm_instruction *instruction, char *cp)
{
char *mnemonic = NULL;
int rn = (opcode >> 16) & 0xf;
int rd = (opcode >> 8) & 0xf;
unsigned immed;
bool add = false;
bool is_signed = false;
immed = (opcode & 0x0ff) | ((opcode & 0x7000) >> 4);
if (opcode & (1 << 26))
immed |= (1 << 11);
switch ((opcode >> 20) & 0x1f) {
case 0:
if (rn == 0xf) {
add = true;
goto do_adr;
}
mnemonic = "ADDW";
break;
case 4:
immed |= (opcode >> 4) & 0xf000;
sprintf(cp, "MOVW\tr%d, #%d\t; %#3.3x", rd, immed, immed);
return ERROR_OK;
case 0x0a:
if (rn == 0xf)
goto do_adr;
mnemonic = "SUBW";
break;
case 0x0c:
/* move constant to top 16 bits of register */
immed |= (opcode >> 4) & 0xf000;
sprintf(cp, "MOVT\tr%d, #%d\t; %#4.4x", rd, immed, immed);
return ERROR_OK;
case 0x10:
case 0x12:
is_signed = true;
case 0x18:
case 0x1a:
/* signed/unsigned saturated add */
immed = (opcode >> 6) & 0x03;
immed |= (opcode >> 10) & 0x1c;
sprintf(cp, "%sSAT\tr%d, #%d, r%d, %s #%d\t",
is_signed ? "S" : "U",
rd, (int) (opcode & 0x1f) + is_signed, rn,
(opcode & (1 << 21)) ? "ASR" : "LSL",
immed ? immed : 32);
return ERROR_OK;
case 0x14:
is_signed = true;
/* FALLTHROUGH */
case 0x1c:
/* signed/unsigned bitfield extract */
immed = (opcode >> 6) & 0x03;
immed |= (opcode >> 10) & 0x1c;
sprintf(cp, "%sBFX\tr%d, r%d, #%d, #%d\t",
is_signed ? "S" : "U",
rd, rn, immed,
(int) (opcode & 0x1f) + 1);
return ERROR_OK;
case 0x16:
immed = (opcode >> 6) & 0x03;
immed |= (opcode >> 10) & 0x1c;
if (rn == 0xf) /* bitfield clear */
sprintf(cp, "BFC\tr%d, #%d, #%d\t",
rd, immed,
(int) (opcode & 0x1f) + 1 - immed);
else /* bitfield insert */
sprintf(cp, "BFI\tr%d, r%d, #%d, #%d\t",
rd, rn, immed,
(int) (opcode & 0x1f) + 1 - immed);
return ERROR_OK;
default:
return ERROR_COMMAND_SYNTAX_ERROR;
}
sprintf(cp, "%s\tr%d, r%d, #%d\t; %#3.3x", mnemonic,
rd, rn, immed, immed);
return ERROR_OK;
do_adr:
address = thumb_alignpc4(address);
if (add)
address += immed;
else
address -= immed;
/* REVISIT "ADD/SUB Rd, PC, #const ; 0x..." might be better;
* not hiding the pc-relative stuff will sometimes be useful.
*/
sprintf(cp, "ADR.W\tr%d, %#8.8" PRIx32, rd, address);
return ERROR_OK;
}
static int t2ev_store_single(uint32_t opcode, uint32_t address,
struct arm_instruction *instruction, char *cp)
{
unsigned op = (opcode >> 20) & 0xf;
char *size = "";
char *suffix = "";
char *p1 = "";
char *p2 = "]";
unsigned immed;
unsigned rn = (opcode >> 16) & 0x0f;
unsigned rt = (opcode >> 12) & 0x0f;
if (rn == 0xf)
return ERROR_COMMAND_SYNTAX_ERROR;
if (opcode & 0x0800)
op |= 1;
switch (op) {
/* byte */
case 0x8:
case 0x9:
size = "B";
goto imm12;
case 0x1:
size = "B";
goto imm8;
case 0x0:
size = "B";
break;
/* halfword */
case 0xa:
case 0xb:
size = "H";
goto imm12;
case 0x3:
size = "H";
goto imm8;
case 0x2:
size = "H";
break;
/* word */
case 0xc:
case 0xd:
goto imm12;
case 0x5:
goto imm8;
case 0x4:
break;
/* error */
default:
return ERROR_COMMAND_SYNTAX_ERROR;
}
sprintf(cp, "STR%s.W\tr%d, [r%d, r%d, LSL #%d]",
size, rt, rn, (int) opcode & 0x0f,
(int) (opcode >> 4) & 0x03);
return ERROR_OK;
imm12:
immed = opcode & 0x0fff;
sprintf(cp, "STR%s.W\tr%d, [r%d, #%u]\t; %#3.3x",
size, rt, rn, immed, immed);
return ERROR_OK;
imm8:
immed = opcode & 0x00ff;
switch (opcode & 0x700) {
case 0x600:
suffix = "T";
break;
case 0x000:
case 0x200:
return ERROR_COMMAND_SYNTAX_ERROR;
}
/* two indexed modes will write back rn */
if (opcode & 0x100) {
if (opcode & 0x400) /* pre-indexed */
p2 = "]!";
else { /* post-indexed */
p1 = "]";
p2 = "";
}
}
sprintf(cp, "STR%s%s\tr%d, [r%d%s, #%s%u%s\t; %#2.2x",
size, suffix, rt, rn, p1,
(opcode & 0x200) ? "" : "-",
immed, p2, immed);
return ERROR_OK;
}
static int t2ev_mul32(uint32_t opcode, uint32_t address,
struct arm_instruction *instruction, char *cp)
{
int ra = (opcode >> 12) & 0xf;
switch (opcode & 0x007000f0) {
case 0:
if (ra == 0xf)
sprintf(cp, "MUL\tr%d, r%d, r%d",
(int) (opcode >> 8) & 0xf,
(int) (opcode >> 16) & 0xf,
(int) (opcode >> 0) & 0xf);
else
sprintf(cp, "MLA\tr%d, r%d, r%d, r%d",
(int) (opcode >> 8) & 0xf,
(int) (opcode >> 16) & 0xf,
(int) (opcode >> 0) & 0xf, ra);
break;
case 0x10:
sprintf(cp, "MLS\tr%d, r%d, r%d, r%d",
(int) (opcode >> 8) & 0xf,
(int) (opcode >> 16) & 0xf,
(int) (opcode >> 0) & 0xf, ra);
break;
default:
return ERROR_COMMAND_SYNTAX_ERROR;
}
return ERROR_OK;
}
static int t2ev_mul64_div(uint32_t opcode, uint32_t address,
struct arm_instruction *instruction, char *cp)
{
int op = (opcode >> 4) & 0xf;
char *infix = "MUL";
op += (opcode >> 16) & 0x70;
switch (op) {
case 0x40:
case 0x60:
infix = "MLA";
/* FALLTHROUGH */
case 0:
case 0x20:
sprintf(cp, "%c%sL\tr%d, r%d, r%d, r%d",
(op & 0x20) ? 'U' : 'S',
infix,
(int) (opcode >> 12) & 0xf,
(int) (opcode >> 8) & 0xf,
(int) (opcode >> 16) & 0xf,
(int) (opcode >> 0) & 0xf);
break;
case 0x1f:
case 0x3f:
sprintf(cp, "%cDIV\tr%d, r%d, r%d",
(op & 0x20) ? 'U' : 'S',
(int) (opcode >> 8) & 0xf,
(int) (opcode >> 16) & 0xf,
(int) (opcode >> 0) & 0xf);
break;
default:
return ERROR_COMMAND_SYNTAX_ERROR;
}
return ERROR_OK;
}
static int t2ev_ldm_stm(uint32_t opcode, uint32_t address,
struct arm_instruction *instruction, char *cp)
{
int rn = (opcode >> 16) & 0xf;
int op = (opcode >> 22) & 0x6;
int t = (opcode >> 21) & 1;
unsigned registers = opcode & 0xffff;
char *mode = "";
if (opcode & (1 << 20))
op |= 1;
switch (op) {
case 0:
mode = "DB";
/* FALL THROUGH */
case 6:
sprintf(cp, "SRS%s\tsp%s, #%d", mode,
t ? "!" : "",
(unsigned) (opcode & 0x1f));
return ERROR_OK;
case 1:
mode = "DB";
/* FALL THROUGH */
case 7:
sprintf(cp, "RFE%s\tr%d%s", mode,
(unsigned) ((opcode >> 16) & 0xf),
t ? "!" : "");
return ERROR_OK;
case 2:
sprintf(cp, "STM.W\tr%d%s, ", rn, t ? "!" : "");
break;
case 3:
if (rn == 13 && t)
sprintf(cp, "POP.W\t");
else
sprintf(cp, "LDM.W\tr%d%s, ", rn, t ? "!" : "");
break;
case 4:
if (rn == 13 && t)
sprintf(cp, "PUSH.W\t");
else
sprintf(cp, "STMDB\tr%d%s, ", rn, t ? "!" : "");
break;
case 5:
sprintf(cp, "LDMDB.W\tr%d%s, ", rn, t ? "!" : "");
break;
default:
return ERROR_COMMAND_SYNTAX_ERROR;
}
cp = strchr(cp, 0);
*cp++ = '{';
for (t = 0; registers; t++, registers >>= 1) {
if ((registers & 1) == 0)
continue;
registers &= ~1;
sprintf(cp, "r%d%s", t, registers ? ", " : "");
cp = strchr(cp, 0);
}
*cp++ = '}';
*cp++ = 0;
return ERROR_OK;
}
/* load/store dual or exclusive, table branch */
static int t2ev_ldrex_strex(uint32_t opcode, uint32_t address,
struct arm_instruction *instruction, char *cp)
{
unsigned op1op2 = (opcode >> 20) & 0x3;
unsigned op3 = (opcode >> 4) & 0xf;
char *mnemonic;
unsigned rn = (opcode >> 16) & 0xf;
unsigned rt = (opcode >> 12) & 0xf;
unsigned rd = (opcode >> 8) & 0xf;
unsigned imm = opcode & 0xff;
char *p1 = "";
char *p2 = "]";
op1op2 |= (opcode >> 21) & 0xc;
switch (op1op2) {
case 0:
mnemonic = "STREX";
goto strex;
case 1:
mnemonic = "LDREX";
goto ldrex;
case 2:
case 6:
case 8:
case 10:
case 12:
case 14:
mnemonic = "STRD";
goto immediate;
case 3:
case 7:
case 9:
case 11:
case 13:
case 15:
mnemonic = "LDRD";
if (rn == 15)
goto literal;
else
goto immediate;
case 4:
switch (op3) {
case 4:
mnemonic = "STREXB";
break;
case 5:
mnemonic = "STREXH";
break;
default:
return ERROR_COMMAND_SYNTAX_ERROR;
}
rd = opcode & 0xf;
imm = 0;
goto strex;
case 5:
switch (op3) {
case 0:
sprintf(cp, "TBB\t[r%u, r%u]", rn, imm & 0xf);
return ERROR_OK;
case 1:
sprintf(cp, "TBH\t[r%u, r%u, LSL #1]", rn, imm & 0xf);
return ERROR_OK;
case 4:
mnemonic = "LDREXB";
break;
case 5:
mnemonic = "LDREXH";
break;
default:
return ERROR_COMMAND_SYNTAX_ERROR;
}
imm = 0;
goto ldrex;
}
return ERROR_COMMAND_SYNTAX_ERROR;
strex:
imm <<= 2;
if (imm)
sprintf(cp, "%s\tr%u, r%u, [r%u, #%u]\t; %#2.2x",
mnemonic, rd, rt, rn, imm, imm);
else
sprintf(cp, "%s\tr%u, r%u, [r%u]",
mnemonic, rd, rt, rn);
return ERROR_OK;
ldrex:
imm <<= 2;
if (imm)
sprintf(cp, "%s\tr%u, [r%u, #%u]\t; %#2.2x",
mnemonic, rt, rn, imm, imm);
else
sprintf(cp, "%s\tr%u, [r%u]",
mnemonic, rt, rn);
return ERROR_OK;
immediate:
/* two indexed modes will write back rn */
if (opcode & (1 << 21)) {
if (opcode & (1 << 24)) /* pre-indexed */
p2 = "]!";
else { /* post-indexed */
p1 = "]";
p2 = "";
}
}
imm <<= 2;
sprintf(cp, "%s\tr%u, r%u, [r%u%s, #%s%u%s\t; %#2.2x",
mnemonic, rt, rd, rn, p1,
(opcode & (1 << 23)) ? "" : "-",
imm, p2, imm);
return ERROR_OK;
literal:
address = thumb_alignpc4(address);
imm <<= 2;
if (opcode & (1 << 23))
address += imm;
else
address -= imm;
sprintf(cp, "%s\tr%u, r%u, %#8.8" PRIx32,
mnemonic, rt, rd, address);
return ERROR_OK;
}
static int t2ev_data_shift(uint32_t opcode, uint32_t address,
struct arm_instruction *instruction, char *cp)
{
int op = (opcode >> 21) & 0xf;
int rd = (opcode >> 8) & 0xf;
int rn = (opcode >> 16) & 0xf;
int type = (opcode >> 4) & 0x3;
int immed = (opcode >> 6) & 0x3;
char *mnemonic;
char *suffix = "";
immed |= (opcode >> 10) & 0x1c;
if (opcode & (1 << 20))
suffix = "S";
switch (op) {
case 0:
if (rd == 0xf) {
if (!(opcode & (1 << 20)))
return ERROR_COMMAND_SYNTAX_ERROR;
instruction->type = ARM_TST;
mnemonic = "TST";
suffix = "";
goto two;
}
instruction->type = ARM_AND;
mnemonic = "AND";
break;
case 1:
instruction->type = ARM_BIC;
mnemonic = "BIC";
break;
case 2:
if (rn == 0xf) {
instruction->type = ARM_MOV;
switch (type) {
case 0:
if (immed == 0) {
sprintf(cp, "MOV%s.W\tr%d, r%d",
suffix, rd,
(int) (opcode & 0xf));
return ERROR_OK;
}
mnemonic = "LSL";
break;
case 1:
mnemonic = "LSR";
break;
case 2:
mnemonic = "ASR";
break;
default:
if (immed == 0) {
sprintf(cp, "RRX%s\tr%d, r%d",
suffix, rd,
(int) (opcode & 0xf));
return ERROR_OK;
}
mnemonic = "ROR";
break;
}
goto immediate;
} else {
instruction->type = ARM_ORR;
mnemonic = "ORR";
}
break;
case 3:
if (rn == 0xf) {
instruction->type = ARM_MVN;
mnemonic = "MVN";
rn = rd;
goto two;
} else {
/* instruction->type = ARM_ORN; */
mnemonic = "ORN";
}
break;
case 4:
if (rd == 0xf) {
if (!(opcode & (1 << 20)))
return ERROR_COMMAND_SYNTAX_ERROR;
instruction->type = ARM_TEQ;
mnemonic = "TEQ";
suffix = "";
goto two;
}
instruction->type = ARM_EOR;
mnemonic = "EOR";
break;
case 8:
if (rd == 0xf) {
if (!(opcode & (1 << 20)))
return ERROR_COMMAND_SYNTAX_ERROR;
instruction->type = ARM_CMN;
mnemonic = "CMN";
suffix = "";
goto two;
}
instruction->type = ARM_ADD;
mnemonic = "ADD";
break;
case 0xa:
instruction->type = ARM_ADC;
mnemonic = "ADC";
break;
case 0xb:
instruction->type = ARM_SBC;
mnemonic = "SBC";
break;
case 0xd:
if (rd == 0xf) {
if (!(opcode & (1 << 21)))
return ERROR_COMMAND_SYNTAX_ERROR;
instruction->type = ARM_CMP;
mnemonic = "CMP";
suffix = "";
goto two;
}
instruction->type = ARM_SUB;
mnemonic = "SUB";
break;
case 0xe:
instruction->type = ARM_RSB;
mnemonic = "RSB";
break;
default:
return ERROR_COMMAND_SYNTAX_ERROR;
}
sprintf(cp, "%s%s.W\tr%d, r%d, r%d",
mnemonic, suffix, rd, rn, (int) (opcode & 0xf));
shift:
cp = strchr(cp, 0);
switch (type) {
case 0:
if (immed == 0)
return ERROR_OK;
suffix = "LSL";
break;
case 1:
suffix = "LSR";
if (immed == 32)
immed = 0;
break;
case 2:
suffix = "ASR";
if (immed == 32)
immed = 0;
break;
case 3:
if (immed == 0) {
strcpy(cp, ", RRX");
return ERROR_OK;
}
suffix = "ROR";
break;
}
sprintf(cp, ", %s #%d", suffix, immed ? immed : 32);
return ERROR_OK;
two:
sprintf(cp, "%s%s.W\tr%d, r%d",
mnemonic, suffix, rn, (int) (opcode & 0xf));
goto shift;
immediate:
sprintf(cp, "%s%s.W\tr%d, r%d, #%d",
mnemonic, suffix, rd,
(int) (opcode & 0xf), immed ? immed : 32);
return ERROR_OK;
}
static int t2ev_data_reg(uint32_t opcode, uint32_t address,
struct arm_instruction *instruction, char *cp)
{
char *mnemonic;
char *suffix = "";
if (((opcode >> 4) & 0xf) == 0) {
switch ((opcode >> 21) & 0x7) {
case 0:
mnemonic = "LSL";
break;
case 1:
mnemonic = "LSR";
break;
case 2:
mnemonic = "ASR";
break;
case 3:
mnemonic = "ROR";
break;
default:
return ERROR_COMMAND_SYNTAX_ERROR;
}
instruction->type = ARM_MOV;
if (opcode & (1 << 20))
suffix = "S";
sprintf(cp, "%s%s.W\tr%d, r%d, r%d",
mnemonic, suffix,
(int) (opcode >> 8) & 0xf,
(int) (opcode >> 16) & 0xf,
(int) (opcode >> 0) & 0xf);
} else if (opcode & (1 << 7)) {
switch ((opcode >> 20) & 0xf) {
case 0:
case 1:
case 4:
case 5:
switch ((opcode >> 4) & 0x3) {
case 1:
suffix = ", ROR #8";
break;
case 2:
suffix = ", ROR #16";
break;
case 3:
suffix = ", ROR #24";
break;
}
sprintf(cp, "%cXT%c.W\tr%d, r%d%s",
(opcode & (1 << 24)) ? 'U' : 'S',
(opcode & (1 << 26)) ? 'B' : 'H',
(int) (opcode >> 8) & 0xf,
(int) (opcode >> 0) & 0xf,
suffix);
break;
case 8:
case 9:
case 0xa:
case 0xb:
if (opcode & (1 << 6))
return ERROR_COMMAND_SYNTAX_ERROR;
if (((opcode >> 12) & 0xf) != 0xf)
return ERROR_COMMAND_SYNTAX_ERROR;
if (!(opcode & (1 << 20)))
return ERROR_COMMAND_SYNTAX_ERROR;
switch (((opcode >> 19) & 0x04)
| ((opcode >> 4) & 0x3)) {
case 0:
mnemonic = "REV.W";
break;
case 1:
mnemonic = "REV16.W";
break;
case 2:
mnemonic = "RBIT";
break;
case 3:
mnemonic = "REVSH.W";
break;
case 4:
mnemonic = "CLZ";
break;
default:
return ERROR_COMMAND_SYNTAX_ERROR;
}
sprintf(cp, "%s\tr%d, r%d",
mnemonic,
(int) (opcode >> 8) & 0xf,
(int) (opcode >> 0) & 0xf);
break;
default:
return ERROR_COMMAND_SYNTAX_ERROR;
}
}
return ERROR_OK;
}
static int t2ev_load_word(uint32_t opcode, uint32_t address,
struct arm_instruction *instruction, char *cp)
{
int rn = (opcode >> 16) & 0xf;
int immed;
instruction->type = ARM_LDR;
if (rn == 0xf) {
immed = opcode & 0x0fff;
if ((opcode & (1 << 23)) == 0)
immed = -immed;
sprintf(cp, "LDR\tr%d, %#8.8" PRIx32,
(int) (opcode >> 12) & 0xf,
thumb_alignpc4(address) + immed);
return ERROR_OK;
}
if (opcode & (1 << 23)) {
immed = opcode & 0x0fff;
sprintf(cp, "LDR.W\tr%d, [r%d, #%d]\t; %#3.3x",
(int) (opcode >> 12) & 0xf,
rn, immed, immed);
return ERROR_OK;
}
if (!(opcode & (0x3f << 6))) {
sprintf(cp, "LDR.W\tr%d, [r%d, r%d, LSL #%d]",
(int) (opcode >> 12) & 0xf,
rn,
(int) (opcode >> 0) & 0xf,
(int) (opcode >> 4) & 0x3);
return ERROR_OK;
}
if (((opcode >> 8) & 0xf) == 0xe) {
immed = opcode & 0x00ff;
sprintf(cp, "LDRT\tr%d, [r%d, #%d]\t; %#2.2x",
(int) (opcode >> 12) & 0xf,
rn, immed, immed);
return ERROR_OK;
}
if (((opcode >> 8) & 0xf) == 0xc || (opcode & 0x0900) == 0x0900) {
char *p1 = "]", *p2 = "";
if (!(opcode & 0x0500))
return ERROR_COMMAND_SYNTAX_ERROR;
immed = opcode & 0x00ff;
/* two indexed modes will write back rn */
if (opcode & 0x100) {
if (opcode & 0x400) /* pre-indexed */
p2 = "]!";
else { /* post-indexed */
p1 = "]";
p2 = "";
}
}
sprintf(cp, "LDR\tr%d, [r%d%s, #%s%u%s\t; %#2.2x",
(int) (opcode >> 12) & 0xf,
rn, p1,
(opcode & 0x200) ? "" : "-",
immed, p2, immed);
return ERROR_OK;
}
return ERROR_COMMAND_SYNTAX_ERROR;
}
static int t2ev_load_byte_hints(uint32_t opcode, uint32_t address,
struct arm_instruction *instruction, char *cp)
{
int rn = (opcode >> 16) & 0xf;
int rt = (opcode >> 12) & 0xf;
int op2 = (opcode >> 6) & 0x3f;
unsigned immed;
char *p1 = "", *p2 = "]";
char *mnemonic;
switch ((opcode >> 23) & 0x3) {
case 0:
if ((rn & rt) == 0xf) {
pld_literal:
immed = opcode & 0xfff;
address = thumb_alignpc4(address);
if (opcode & (1 << 23))
address += immed;
else
address -= immed;
sprintf(cp, "PLD\tr%d, %#8.8" PRIx32,
rt, address);
return ERROR_OK;
}
if (rn == 0x0f && rt != 0x0f) {
ldrb_literal:
immed = opcode & 0xfff;
address = thumb_alignpc4(address);
if (opcode & (1 << 23))
address += immed;
else
address -= immed;
sprintf(cp, "LDRB\tr%d, %#8.8" PRIx32,
rt, address);
return ERROR_OK;
}
if (rn == 0x0f)
break;
if ((op2 & 0x3c) == 0x38) {
immed = opcode & 0xff;
sprintf(cp, "LDRBT\tr%d, [r%d, #%d]\t; %#2.2x",
rt, rn, immed, immed);
return ERROR_OK;
}
if ((op2 & 0x3c) == 0x30) {
if (rt == 0x0f) {
immed = opcode & 0xff;
immed = -immed;
preload_immediate:
p1 = (opcode & (1 << 21)) ? "W" : "";
sprintf(cp, "PLD%s\t[r%d, #%d]\t; %#6.6x",
p1, rn, immed, immed);
return ERROR_OK;
}
mnemonic = "LDRB";
ldrxb_immediate_t3:
immed = opcode & 0xff;
if (!(opcode & 0x200))
immed = -immed;
/* two indexed modes will write back rn */
if (opcode & 0x100) {
if (opcode & 0x400) /* pre-indexed */
p2 = "]!";
else { /* post-indexed */
p1 = "]";
p2 = "";
}
}
ldrxb_immediate_t2:
sprintf(cp, "%s\tr%d, [r%d%s, #%d%s\t; %#8.8x",
mnemonic, rt, rn, p1,
immed, p2, immed);
return ERROR_OK;
}
if ((op2 & 0x24) == 0x24) {
mnemonic = "LDRB";
goto ldrxb_immediate_t3;
}
if (op2 == 0) {
int rm = opcode & 0xf;
if (rt == 0x0f)
sprintf(cp, "PLD\t");
else
sprintf(cp, "LDRB.W\tr%d, ", rt);
immed = (opcode >> 4) & 0x3;
cp = strchr(cp, 0);
sprintf(cp, "[r%d, r%d, LSL #%d]", rn, rm, immed);
return ERROR_OK;
}
break;
case 1:
if ((rn & rt) == 0xf)
goto pld_literal;
if (rt == 0xf) {
immed = opcode & 0xfff;
goto preload_immediate;
}
if (rn == 0x0f)
goto ldrb_literal;
mnemonic = "LDRB.W";
immed = opcode & 0xfff;
goto ldrxb_immediate_t2;
case 2:
if ((rn & rt) == 0xf) {
immed = opcode & 0xfff;
address = thumb_alignpc4(address);
if (opcode & (1 << 23))
address += immed;
else
address -= immed;
sprintf(cp, "PLI\t%#8.8" PRIx32, address);
return ERROR_OK;
}
if (rn == 0xf && rt != 0xf) {
ldrsb_literal:
immed = opcode & 0xfff;
address = thumb_alignpc4(address);
if (opcode & (1 << 23))
address += immed;
else
address -= immed;
sprintf(cp, "LDRSB\t%#8.8" PRIx32, address);
return ERROR_OK;
}
if (rn == 0xf)
break;
if ((op2 & 0x3c) == 0x38) {
immed = opcode & 0xff;
sprintf(cp, "LDRSBT\tr%d, [r%d, #%d]\t; %#2.2x",
rt, rn, immed, immed);
return ERROR_OK;
}
if ((op2 & 0x3c) == 0x30) {
if (rt == 0xf) {
immed = opcode & 0xff;
immed = -immed; /* pli */
sprintf(cp, "PLI\t[r%d, #%d]\t; -%#2.2x",
rn, immed, -immed);
return ERROR_OK;
}
mnemonic = "LDRSB";
goto ldrxb_immediate_t3;
}
if ((op2 & 0x24) == 0x24) {
mnemonic = "LDRSB";
goto ldrxb_immediate_t3;
}
if (op2 == 0) {
int rm = opcode & 0xf;
if (rt == 0x0f)
sprintf(cp, "PLI\t");
else
sprintf(cp, "LDRSB.W\tr%d, ", rt);
immed = (opcode >> 4) & 0x3;
cp = strchr(cp, 0);
sprintf(cp, "[r%d, r%d, LSL #%d]", rn, rm, immed);
return ERROR_OK;
}
break;
case 3:
if (rt == 0xf) {
immed = opcode & 0xfff;
sprintf(cp, "PLI\t[r%d, #%d]\t; %#3.3x",
rn, immed, immed);
return ERROR_OK;
}
if (rn == 0xf)
goto ldrsb_literal;
immed = opcode & 0xfff;
mnemonic = "LDRSB";
goto ldrxb_immediate_t2;
}
return ERROR_COMMAND_SYNTAX_ERROR;
}
static int t2ev_load_halfword(uint32_t opcode, uint32_t address,
struct arm_instruction *instruction, char *cp)
{
int rn = (opcode >> 16) & 0xf;
int rt = (opcode >> 12) & 0xf;
int op2 = (opcode >> 6) & 0x3f;
char *sign = "";
unsigned immed;
if (rt == 0xf) {
sprintf(cp, "HINT (UNALLOCATED)");
return ERROR_OK;
}
if (opcode & (1 << 24))
sign = "S";
if ((opcode & (1 << 23)) == 0) {
if (rn == 0xf) {
ldrh_literal:
immed = opcode & 0xfff;
address = thumb_alignpc4(address);
if (opcode & (1 << 23))
address += immed;
else
address -= immed;
sprintf(cp, "LDR%sH\tr%d, %#8.8" PRIx32,
sign, rt, address);
return ERROR_OK;
}
if (op2 == 0) {
int rm = opcode & 0xf;
immed = (opcode >> 4) & 0x3;
sprintf(cp, "LDR%sH.W\tr%d, [r%d, r%d, LSL #%d]",
sign, rt, rn, rm, immed);
return ERROR_OK;
}
if ((op2 & 0x3c) == 0x38) {
immed = opcode & 0xff;
sprintf(cp, "LDR%sHT\tr%d, [r%d, #%d]\t; %#2.2x",
sign, rt, rn, immed, immed);
return ERROR_OK;
}
if ((op2 & 0x3c) == 0x30 || (op2 & 0x24) == 0x24) {
char *p1 = "", *p2 = "]";
immed = opcode & 0xff;
if (!(opcode & 0x200))
immed = -immed;
/* two indexed modes will write back rn */
if (opcode & 0x100) {
if (opcode & 0x400) /* pre-indexed */
p2 = "]!";
else { /* post-indexed */
p1 = "]";
p2 = "";
}
}
sprintf(cp, "LDR%sH\tr%d, [r%d%s, #%d%s\t; %#8.8x",
sign, rt, rn, p1, immed, p2, immed);
return ERROR_OK;
}
} else {
if (rn == 0xf)
goto ldrh_literal;
immed = opcode & 0xfff;
sprintf(cp, "LDR%sH%s\tr%d, [r%d, #%d]\t; %#6.6x",
sign, *sign ? "" : ".W",
rt, rn, immed, immed);
return ERROR_OK;
}
return ERROR_COMMAND_SYNTAX_ERROR;
}
/*
* REVISIT for Thumb2 instructions, instruction->type and friends aren't
* always set. That means eventual arm_simulate_step() support for Thumb2
* will need work in this area.
*/
int thumb2_opcode(struct target *target, uint32_t address, struct arm_instruction *instruction)
{
int retval;
uint16_t op;
uint32_t opcode;
char *cp;
/* clear low bit ... it's set on function pointers */
address &= ~1;
/* clear fields, to avoid confusion */
memset(instruction, 0, sizeof(struct arm_instruction));
/* read first halfword, see if this is the only one */
retval = target_read_u16(target, address, &op);
if (retval != ERROR_OK)
return retval;
switch (op & 0xf800) {
case 0xf800:
case 0xf000:
case 0xe800:
/* 32-bit instructions */
instruction->instruction_size = 4;
opcode = op << 16;
retval = target_read_u16(target, address + 2, &op);
if (retval != ERROR_OK)
return retval;
opcode |= op;
instruction->opcode = opcode;
break;
default:
/* 16-bit: Thumb1 + IT + CBZ/CBNZ + ... */
return thumb_evaluate_opcode(op, address, instruction);
}
snprintf(instruction->text, 128,
"0x%8.8" PRIx32 " 0x%8.8" PRIx32 "\t",
address, opcode);
cp = strchr(instruction->text, 0);
retval = ERROR_FAIL;
/* ARMv7-M: A5.3.1 Data processing (modified immediate) */
if ((opcode & 0x1a008000) == 0x10000000)
retval = t2ev_data_mod_immed(opcode, address, instruction, cp);
/* ARMv7-M: A5.3.3 Data processing (plain binary immediate) */
else if ((opcode & 0x1a008000) == 0x12000000)
retval = t2ev_data_immed(opcode, address, instruction, cp);
/* ARMv7-M: A5.3.4 Branches and miscellaneous control */
else if ((opcode & 0x18008000) == 0x10008000)
retval = t2ev_b_misc(opcode, address, instruction, cp);
/* ARMv7-M: A5.3.5 Load/store multiple */
else if ((opcode & 0x1e400000) == 0x08000000)
retval = t2ev_ldm_stm(opcode, address, instruction, cp);
/* ARMv7-M: A5.3.6 Load/store dual or exclusive, table branch */
else if ((opcode & 0x1e400000) == 0x08400000)
retval = t2ev_ldrex_strex(opcode, address, instruction, cp);
/* ARMv7-M: A5.3.7 Load word */
else if ((opcode & 0x1f700000) == 0x18500000)
retval = t2ev_load_word(opcode, address, instruction, cp);
/* ARMv7-M: A5.3.8 Load halfword, unallocated memory hints */
else if ((opcode & 0x1e700000) == 0x18300000)
retval = t2ev_load_halfword(opcode, address, instruction, cp);
/* ARMv7-M: A5.3.9 Load byte, memory hints */
else if ((opcode & 0x1e700000) == 0x18100000)
retval = t2ev_load_byte_hints(opcode, address, instruction, cp);
/* ARMv7-M: A5.3.10 Store single data item */
else if ((opcode & 0x1f100000) == 0x18000000)
retval = t2ev_store_single(opcode, address, instruction, cp);
/* ARMv7-M: A5.3.11 Data processing (shifted register) */
else if ((opcode & 0x1e000000) == 0x0a000000)
retval = t2ev_data_shift(opcode, address, instruction, cp);
/* ARMv7-M: A5.3.12 Data processing (register)
* and A5.3.13 Miscellaneous operations
*/
else if ((opcode & 0x1f000000) == 0x1a000000)
retval = t2ev_data_reg(opcode, address, instruction, cp);
/* ARMv7-M: A5.3.14 Multiply, and multiply accumulate */
else if ((opcode & 0x1f800000) == 0x1b000000)
retval = t2ev_mul32(opcode, address, instruction, cp);
/* ARMv7-M: A5.3.15 Long multiply, long multiply accumulate, divide */
else if ((opcode & 0x1f800000) == 0x1b800000)
retval = t2ev_mul64_div(opcode, address, instruction, cp);
if (retval == ERROR_OK)
return retval;
/*
* Thumb2 also supports coprocessor, ThumbEE, and DSP/Media (SIMD)
* instructions; not yet handled here.
*/
if (retval == ERROR_COMMAND_SYNTAX_ERROR) {
instruction->type = ARM_UNDEFINED_INSTRUCTION;
strcpy(cp, "UNDEFINED OPCODE");
return ERROR_OK;
}
LOG_DEBUG("Can't decode 32-bit Thumb2 yet (opcode=%08" PRIx32 ")",
opcode);
strcpy(cp, "(32-bit Thumb2 ...)");
return ERROR_OK;
}
int arm_access_size(struct arm_instruction *instruction)
{
if ((instruction->type == ARM_LDRB)
|| (instruction->type == ARM_LDRBT)
|| (instruction->type == ARM_LDRSB)
|| (instruction->type == ARM_STRB)
|| (instruction->type == ARM_STRBT))
return 1;
else if ((instruction->type == ARM_LDRH)
|| (instruction->type == ARM_LDRSH)
|| (instruction->type == ARM_STRH))
return 2;
else if ((instruction->type == ARM_LDR)
|| (instruction->type == ARM_LDRT)
|| (instruction->type == ARM_STR)
|| (instruction->type == ARM_STRT))
return 4;
else if ((instruction->type == ARM_LDRD)
|| (instruction->type == ARM_STRD))
return 8;
else {
LOG_ERROR("BUG: instruction type %i isn't a load/store instruction",
instruction->type);
return 0;
}
}
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