* 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 *
* Might be simplest to always use the Thumb2 decoder.
*/
- snprintf(instruction->text, 128, "0x%8.8" PRIx32 "\t0x%4.4x\t%s 0x%8.8" PRIx32 , address, opcode,mnemonic, target_address);
+ 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;
{
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 "\t0x%4.4x\t%s r%i, r%i, #%d",
- address, opcode, mnemonic, Rd, Rn, 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 "\t0x%4.4x\t%s r%i, r%i, r%i",
- address, opcode, mnemonic, Rd, Rn, 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;
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 "\t0x%4.4x\t%s r%i, r%i, #0x%02x" ,
- address, opcode, mnemonic, Rd, Rm, 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;
}
break;
}
- snprintf(instruction->text, 128, "0x%8.8" PRIx32 "\t0x%4.4x\t%s r%i, #0x%02x" ,
- address, opcode, mnemonic, Rd, imm);
+ 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;
}
{
uint8_t high_reg, op, Rm, Rd,H1,H2;
char *mnemonic = NULL;
+ bool nop = false;
high_reg = (opcode & 0x0400) >> 10;
op = (opcode & 0x03C0) >> 6;
case 0x2:
instruction->type = ARM_MOV;
mnemonic = "MOV";
+ if (Rd == Rm)
+ nop = true;
break;
case 0x3:
if ((opcode & 0x7) == 0x0)
if (H1)
{
instruction->type = ARM_BLX;
- snprintf(instruction->text, 128, "0x%8.8" PRIx32 "\t0x%4.4x\tBLX r%i", address, opcode, Rm);
+ 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 "\t0x%4.4x\tBX r%i", address, opcode, Rm);
+ 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 "\t0x%4.4x\tUNDEFINED INSTRUCTION", address, opcode);
+ snprintf(instruction->text, 128,
+ "0x%8.8" PRIx32
+ " 0x%4.4x \t"
+ "UNDEFINED INSTRUCTION",
+ address, opcode);
}
return ERROR_OK;
break;
break;
case 0x9:
instruction->type = ARM_RSB;
- mnemonic = "NEGS";
+ mnemonic = "RSBS";
instruction->info.data_proc.variant = 0 /*immediate*/;
instruction->info.data_proc.shifter_operand.immediate.immediate = 0;
instruction->info.data_proc.Rn = Rm;
}
}
- snprintf(instruction->text, 128, "0x%8.8" PRIx32 "\t0x%4.4x\t%s r%i, r%i",
+ 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;
+}
+
int evaluate_load_literal_thumb(uint16_t opcode, uint32_t address, arm_instruction_t *instruction)
{
uint32_t immediate;
instruction->type = ARM_LDR;
immediate = opcode & 0x000000ff;
-
- snprintf(instruction->text, 128, "0x%8.8" PRIx32 "\t0x%4.4x\tLDR r%i, [PC, #0x%" PRIx32 "]", address, opcode, Rd, immediate*4);
+ 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*4;
+ 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;
}
break;
}
- snprintf(instruction->text, 128, "0x%8.8" PRIx32 "\t0x%4.4x\t%s r%i, [r%i, r%i]", address, opcode, mnemonic, Rd, Rn, Rm);
+ 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;
shift = 0;
}
- snprintf(instruction->text, 128, "0x%8.8" PRIx32 "\t0x%4.4x\t%s%c r%i, [r%i, #0x%" PRIx32 "]", address, opcode, mnemonic, suffix, Rd, Rn, offset << shift);
+ 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;
mnemonic = "STR";
}
- snprintf(instruction->text, 128, "0x%8.8" PRIx32 "\t0x%4.4x\t%s r%i, [SP, #0x%" PRIx32 "]", address, opcode, mnemonic, Rd, offset*4);
+ 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*/;
Rn = 15;
}
- snprintf(instruction->text, 128, "0x%8.8" PRIx32 "\t0x%4.4x\tADD r%i, %s, #0x%" PRIx32 "", address, opcode, Rd,reg_name, imm*4);
+ 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;
mnemonic = "ADD";
}
- snprintf(instruction->text, 128, "0x%8.8" PRIx32 "\t0x%4.4x\t%s SP, #0x%" PRIx32 "", address, opcode, mnemonic, imm*4);
+ 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->type = ARM_BKPT;
- snprintf(instruction->text, 128, "0x%8.8" PRIx32 "\t0x%4.4x\tBKPT 0x%02" PRIx32 "", address, opcode, imm);
+ snprintf(instruction->text, 128,
+ "0x%8.8" PRIx32 " 0x%4.4x \tBKPT\t%#2.2" PRIx32 "",
+ address, opcode, imm);
return ERROR_OK;
}
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,7,"r%i!, ",Rn);
+ snprintf(ptr_name, sizeof ptr_name, "r%i%s, ", Rn, wback);
}
else
{ /* push/pop */
if (reg_names_p > reg_names)
reg_names_p[-2] = '\0';
else /* invalid op : no registers */
- reg_names[0] = '\0';
+ reg_names[0] = '\0';
- snprintf(instruction->text, 128, "0x%8.8" PRIx32 "\t0x%4.4x\t%s %s{%s}", address, opcode, mnemonic, ptr_name,reg_names);
+ 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->type = ARM_SWI;
snprintf(instruction->text, 128,
- "0x%8.8" PRIx32 "\t0x%4.4x\tSVC 0x%02" PRIx32,
+ "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 "\t0x%4.4x\tUNDEFINED INSTRUCTION", address, opcode);
+ snprintf(instruction->text, 128,
+ "0x%8.8" PRIx32 " 0x%4.4x \tUNDEFINED INSTRUCTION",
+ address, opcode);
return ERROR_OK;
}
target_address = address + 4 + (offset << 1);
- snprintf(instruction->text, 128, "0x%8.8" PRIx32 "\t0x%4.4x\tB%s 0x%8.8" PRIx32 , address, opcode,
- arm_condition_strings[cond], target_address);
+ 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;
offset |= (opcode & 0x0200) >> 4;
snprintf(instruction->text, 128,
- "0x%8.8" PRIx32 "\t0x%4.4x\tCB%sZ r%d, %#8.8" PRIx32,
+ "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));
{
/* added in ARMv6 */
snprintf(instruction->text, 128,
- "0x%8.8" PRIx32 "\t0x%4.4x\t%cXT%c r%d, r%d",
+ "0x%8.8" PRIx32 " 0x%4.4x \t%cXT%c\tr%d, r%d",
address, opcode,
(opcode & 0x0080) ? 'U' : 'S',
(opcode & 0x0040) ? 'B' : 'H',
/* added in ARMv6 */
if ((opcode & 0x0ff0) == 0x0650)
snprintf(instruction->text, 128,
- "0x%8.8" PRIx32 "\t0x%4.4x\tSETEND %s",
+ "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 "\t0x%4.4x\tCPSI%c %s%s%s",
+ "0x%8.8" PRIx32 " 0x%4.4x \tCPSI%c\t%s%s%s",
address, opcode,
(opcode & 0x0010) ? 'D' : 'E',
(opcode & 0x0004) ? "A" : "",
char *suffix;
/* added in ARMv6 */
- switch (opcode & 0x00c0) {
+ switch ((opcode >> 6) & 3) {
case 0:
suffix = "";
break;
break;
}
snprintf(instruction->text, 128,
- "0x%8.8" PRIx32 "\t0x%4.4x\tREV%s r%d, r%d",
+ "0x%8.8" PRIx32 " 0x%4.4x \tREV%s\tr%d, r%d",
address, opcode, suffix,
opcode & 0x7, (opcode >> 3) & 0x7);
}
snprintf(instruction->text, 128,
- "0x%8.8" PRIx32 "\t0x%4.4x\t%s",
+ "0x%8.8" PRIx32 " 0x%4.4x \t%s",
address, opcode, hint);
return ERROR_OK;
x = (opcode & 0x08) ? "T" : "E";
snprintf(instruction->text, 128,
- "0x%8.8" PRIx32 "\t0x%4.4x\tIT%s%s%s %s",
+ "0x%8.8" PRIx32 " 0x%4.4x \tIT%s%s%s\t%s",
address, opcode,
x, y, z, arm_condition_strings[cond]);
instruction->type = ARM_UNDEFINED_INSTRUCTION;
snprintf(instruction->text, 128,
- "0x%8.8" PRIx32 "\t0x%4.4x\tUNDEFINED INSTRUCTION",
+ "0x%8.8" PRIx32 " 0x%4.4x \tUNDEFINED INSTRUCTION",
address, opcode);
return ERROR_OK;
}
if ((opcode & 0xf801) == 0xe801)
{
instruction->type = ARM_UNDEFINED_INSTRUCTION;
- snprintf(instruction->text, 128, "0x%8.8" PRIx32 "\t0x%8.8x\tUNDEFINED INSTRUCTION", address, opcode);
+ snprintf(instruction->text, 128,
+ "0x%8.8" PRIx32 " 0x%8.8x\t"
+ "UNDEFINED INSTRUCTION",
+ address, opcode);
return ERROR_OK;
}
else
return -1;
}
-/*
- * 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(target_t *target, uint32_t address, arm_instruction_t *instruction)
+static int t2ev_b_bl(uint32_t opcode, uint32_t address,
+ arm_instruction_t *instruction, char *cp)
{
- int retval;
- uint16_t op;
- uint32_t opcode;
+ unsigned offset;
+ unsigned b21 = 1 << 21;
+ unsigned b22 = 1 << 22;
- /* clear low bit ... it's set on function pointers */
- address &= ~1;
+ /* 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);
- /* clear fields, to avoid confusion */
- memset(instruction, 0, sizeof(arm_instruction_t));
+ return ERROR_OK;
+}
- /* read first halfword, see if this is the only one */
- retval = target_read_u16(target, address, &op);
- if (retval != ERROR_OK)
- return retval;
+static int t2ev_cond_b(uint32_t opcode, uint32_t address,
+ arm_instruction_t *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 |= 0xffff << 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;
- 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;
+ 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,
+ arm_instruction_t *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:
- /* 16-bit: Thumb1 + IT + CBZ/CBNZ + ... */
- return thumb_evaluate_opcode(op, address, instruction);
+ mnemonic = "HINT.W (UNRECOGNIZED)";
+ break;
+ }
+ strcpy(cp, mnemonic);
+ return ERROR_OK;
+}
+
+static int t2ev_misc(uint32_t opcode, uint32_t address,
+ arm_instruction_t *instruction, char *cp)
+{
+ const char *mnemonic;
+
+ switch ((opcode >> 4) & 0x0f) {
+ case 2:
+ mnemonic = "CLREX";
+ break;
+ case 4:
+ mnemonic = "DSB";
+ break;
+ case 5:
+ mnemonic = "DMB";
+ break;
+ case 6:
+ mnemonic = "ISB";
+ break;
+ default:
+ return ERROR_INVALID_ARGUMENTS;
+ }
+ strcpy(cp, mnemonic);
+ return ERROR_OK;
+}
+
+static int t2ev_b_misc(uint32_t opcode, uint32_t address,
+ arm_instruction_t *instruction, char *cp)
+{
+ /* permanently undefined */
+ if ((opcode & 0x07f07000) == 0x07f02000) {
+ instruction->type = ARM_UNDEFINED_INSTRUCTION;
+ strcpy(cp, "UNDEFINED");
+ return ERROR_OK;
}
- /* FIXME decode the 32-bit instructions */
+ 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;
+ }
- LOG_DEBUG("Can't decode 32-bit Thumb2 yet (opcode=%08x)", opcode);
+ 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 0x3e:
+ case 0x3f:
+ sprintf(cp, "MRS\tr%d, %s", (int) (opcode >> 8) & 0x0f,
+ special_name(opcode & 0xff));
+ return ERROR_OK;
+ }
- snprintf(instruction->text, 128,
- "0x%8.8" PRIx32 "\t0x%8.8x\t... 32-bit Thumb2 ...",
- address, opcode);
+undef:
+ return ERROR_INVALID_ARGUMENTS;
+}
+
+static int t2ev_data_mod_immed(uint32_t opcode, uint32_t address,
+ arm_instruction_t *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_INVALID_ARGUMENTS;
+ }
+
+ 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,
+ arm_instruction_t *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", rn, 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_INVALID_ARGUMENTS;
+ }
+
+ 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,
+ arm_instruction_t *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_INVALID_ARGUMENTS;
+
+ 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_INVALID_ARGUMENTS;
+ }
+
+ 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_INVALID_ARGUMENTS;
+ }
+
+ /* 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,
+ arm_instruction_t *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_INVALID_ARGUMENTS;
+ }
+ return ERROR_OK;
+}
+
+static int t2ev_mul64_div(uint32_t opcode, uint32_t address,
+ arm_instruction_t *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_INVALID_ARGUMENTS;
+ }
+
+ return ERROR_OK;
+}
+
+static int t2ev_ldm_stm(uint32_t opcode, uint32_t address,
+ arm_instruction_t *instruction, char *cp)
+{
+ int rn = (opcode >> 16) & 0xf;
+ int op = (opcode >> 22) & 0x6;
+ int t = (opcode >> 21) & 1;
+ unsigned registers = opcode & 0xffff;
+
+ if (opcode & (1 << 20))
+ op |= 1;
+
+ switch (op) {
+ 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_INVALID_ARGUMENTS;
+ }
+
+ 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;
+}
+
+static int t2ev_data_shift(uint32_t opcode, uint32_t address,
+ arm_instruction_t *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) & 0x7;
+ if (opcode & (1 << 21))
+ suffix = "S";
+
+ switch (op) {
+ case 0:
+ if (rd == 0xf) {
+ if (!(opcode & (1 << 21)))
+ return ERROR_INVALID_ARGUMENTS;
+ instruction->type = ARM_TST;
+ mnemonic = "TST";
+ 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.W\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 << 21)))
+ return ERROR_INVALID_ARGUMENTS;
+ instruction->type = ARM_TEQ;
+ mnemonic = "TEQ";
+ goto two;
+ }
+ instruction->type = ARM_EOR;
+ mnemonic = "EOR";
+ break;
+ case 8:
+ if (rd == 0xf) {
+ if (!(opcode & (1 << 21)))
+ return ERROR_INVALID_ARGUMENTS;
+ instruction->type = ARM_CMN;
+ mnemonic = "CMN";
+ 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_INVALID_ARGUMENTS;
+ instruction->type = ARM_CMP;
+ mnemonic = "CMP";
+ goto two;
+ }
+ instruction->type = ARM_SUB;
+ mnemonic = "SUB";
+ break;
+ case 0xe:
+ instruction->type = ARM_RSB;
+ mnemonic = "RSB";
+ break;
+ default:
+ return ERROR_INVALID_ARGUMENTS;
+ }
+
+ 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";
+ break;
+ case 2:
+ suffix = "ASR";
+ 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,
+ arm_instruction_t *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_INVALID_ARGUMENTS;
+ }
+
+ 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_INVALID_ARGUMENTS;
+ if (((opcode >> 12) & 0xf) != 0xf)
+ return ERROR_INVALID_ARGUMENTS;
+ if (!(opcode & (1 << 20)))
+ return ERROR_INVALID_ARGUMENTS;
+
+ 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_INVALID_ARGUMENTS;
+ }
+ sprintf(cp, "%s\tr%d, r%d",
+ mnemonic,
+ (int) (opcode >> 8) & 0xf,
+ (int) (opcode >> 0) & 0xf);
+ break;
+ default:
+ return ERROR_INVALID_ARGUMENTS;
+ }
+ }
+
+ return ERROR_OK;
+}
+
+static int t2ev_load_word(uint32_t opcode, uint32_t address,
+ arm_instruction_t *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_INVALID_ARGUMENTS;
+
+ 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_INVALID_ARGUMENTS;
+}
+
+static int t2ev_load_byte_hints(uint32_t opcode, uint32_t address,
+ arm_instruction_t *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; %#3.3" PRIx32,
+ rn, immed, immed);
+ return ERROR_OK;
+ }
+ if (rn == 0xf)
+ goto ldrsb_literal;
+ immed = opcode & 0xfff;
+ mnemonic = "LDRSB";
+ goto ldrxb_immediate_t2;
+ }
+
+ return ERROR_INVALID_ARGUMENTS;
+}
+
+static int t2ev_load_halfword(uint32_t opcode, uint32_t address,
+ arm_instruction_t *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_INVALID_ARGUMENTS;
+}
+
+/*
+ * 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(target_t *target, uint32_t address, arm_instruction_t *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(arm_instruction_t));
+
+ /* 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: A5.3.7 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);
+
+ /* FIXME decode more 32-bit instructions */
+
+ if (retval == ERROR_OK)
+ return retval;
+
+ if (retval == ERROR_INVALID_ARGUMENTS) {
+ 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;
}
Code Review / openocd.git / blobdiff