+// SPDX-License-Identifier: GPL-2.0-or-later
+
/***************************************************************************
* Copyright (C) 2006 by Dominic Rath *
* Dominic.Rath@gmx.de *
* *
* Copyright (C) 2008 by Hongtao Zheng *
* hontor@126.com *
- * *
- * 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., *
- * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. *
***************************************************************************/
#ifdef HAVE_CONFIG_H
#include "register.h"
#include <helper/log.h>
-static uint32_t arm_shift(uint8_t shift, uint32_t Rm,
+static uint32_t arm_shift(uint8_t shift, uint32_t rm,
uint32_t shift_amount, uint8_t *carry)
{
uint32_t return_value = 0;
if (shift == 0x0) { /* LSL */
if ((shift_amount > 0) && (shift_amount <= 32)) {
- return_value = Rm << shift_amount;
- *carry = Rm >> (32 - shift_amount);
+ return_value = rm << shift_amount;
+ *carry = rm >> (32 - shift_amount);
} else if (shift_amount > 32) {
return_value = 0x0;
*carry = 0x0;
} else /* (shift_amount == 0) */
- return_value = Rm;
+ return_value = rm;
} else if (shift == 0x1) { /* LSR */
if ((shift_amount > 0) && (shift_amount <= 32)) {
- return_value = Rm >> shift_amount;
- *carry = (Rm >> (shift_amount - 1)) & 1;
+ return_value = rm >> shift_amount;
+ *carry = (rm >> (shift_amount - 1)) & 1;
} else if (shift_amount > 32) {
return_value = 0x0;
*carry = 0x0;
} else /* (shift_amount == 0) */
- return_value = Rm;
+ return_value = rm;
} else if (shift == 0x2) { /* ASR */
if ((shift_amount > 0) && (shift_amount <= 32)) {
/* C right shifts of unsigned values are guaranteed to
* shift (shift in signed-bit) by adding the sign bit
* manually
*/
- return_value = Rm >> shift_amount;
- if (Rm & 0x80000000)
+ return_value = rm >> shift_amount;
+ if (rm & 0x80000000)
return_value |= 0xffffffff << (32 - shift_amount);
} else if (shift_amount > 32) {
- if (Rm & 0x80000000) {
+ if (rm & 0x80000000) {
return_value = 0xffffffff;
*carry = 0x1;
} else {
*carry = 0x0;
}
} else /* (shift_amount == 0) */
- return_value = Rm;
+ return_value = rm;
} else if (shift == 0x3) { /* ROR */
if (shift_amount == 0)
- return_value = Rm;
+ return_value = rm;
else {
shift_amount = shift_amount % 32;
- return_value = (Rm >> shift_amount) | (Rm << (32 - shift_amount));
+ return_value = (rm >> shift_amount) | (rm << (32 - shift_amount));
*carry = (return_value >> 31) & 0x1;
}
} else if (shift == 0x4) { /* RRX */
- return_value = Rm >> 1;
+ return_value = rm >> 1;
if (*carry)
- Rm |= 0x80000000;
- *carry = Rm & 0x1;
+ rm |= 0x80000000;
+ *carry = rm & 0x1;
}
return return_value;
if (variant == 0) /* 32-bit immediate */
return_value = shifter_operand.immediate.immediate;
else if (variant == 1) {/* immediate shift */
- uint32_t Rm = sim->get_reg_mode(sim, shifter_operand.immediate_shift.Rm);
+ uint32_t rm = sim->get_reg_mode(sim, shifter_operand.immediate_shift.rm);
/* adjust RM in case the PC is being read */
- if (shifter_operand.immediate_shift.Rm == 15)
- Rm += 2 * instruction_size;
+ if (shifter_operand.immediate_shift.rm == 15)
+ rm += 2 * instruction_size;
return_value = arm_shift(shifter_operand.immediate_shift.shift,
- Rm, shifter_operand.immediate_shift.shift_imm,
+ rm, shifter_operand.immediate_shift.shift_imm,
shifter_carry_out);
} else if (variant == 2) { /* register shift */
- uint32_t Rm = sim->get_reg_mode(sim, shifter_operand.register_shift.Rm);
- uint32_t Rs = sim->get_reg_mode(sim, shifter_operand.register_shift.Rs);
+ uint32_t rm = sim->get_reg_mode(sim, shifter_operand.register_shift.rm);
+ uint32_t rs = sim->get_reg_mode(sim, shifter_operand.register_shift.rs);
/* adjust RM in case the PC is being read */
- if (shifter_operand.register_shift.Rm == 15)
- Rm += 2 * instruction_size;
+ if (shifter_operand.register_shift.rm == 15)
+ rm += 2 * instruction_size;
return_value = arm_shift(shifter_operand.immediate_shift.shift,
- Rm, Rs, shifter_carry_out);
+ rm, rs, shifter_carry_out);
} else {
LOG_ERROR("BUG: shifter_operand.variant not 0, 1 or 2");
return_value = 0xffffffff;
sim->set_reg(sim, 15, target_address);
else if (instruction.type == ARM_BL) {
uint32_t old_pc = sim->get_reg(sim, 15);
- int T = (sim->get_state(sim) == ARM_STATE_THUMB);
- sim->set_reg_mode(sim, 14, old_pc + 4 + T);
+ int t = (sim->get_state(sim) == ARM_STATE_THUMB);
+ sim->set_reg_mode(sim, 14, old_pc + 4 + t);
sim->set_reg(sim, 15, target_address);
} else if (instruction.type == ARM_BX) {
if (target_address & 0x1)
sim->set_reg(sim, 15, target_address & 0xfffffffe);
} else if (instruction.type == ARM_BLX) {
uint32_t old_pc = sim->get_reg(sim, 15);
- int T = (sim->get_state(sim) == ARM_STATE_THUMB);
- sim->set_reg_mode(sim, 14, old_pc + 4 + T);
+ int t = (sim->get_state(sim) == ARM_STATE_THUMB);
+ sim->set_reg_mode(sim, 14, old_pc + 4 + t);
if (target_address & 0x1)
sim->set_state(sim, ARM_STATE_THUMB);
/* data processing instructions, except compare instructions (CMP, CMN, TST, TEQ) */
else if (((instruction.type >= ARM_AND) && (instruction.type <= ARM_RSC))
|| ((instruction.type >= ARM_ORR) && (instruction.type <= ARM_MVN))) {
- uint32_t Rd, Rn, shifter_operand;
- uint8_t C = sim->get_cpsr(sim, 29, 1);
+ uint32_t rd, rn, shifter_operand;
+ uint8_t c = sim->get_cpsr(sim, 29, 1);
uint8_t carry_out;
- Rd = 0x0;
+ rd = 0x0;
/* ARM_MOV and ARM_MVN does not use Rn */
if ((instruction.type != ARM_MOV) && (instruction.type != ARM_MVN))
- Rn = sim->get_reg_mode(sim, instruction.info.data_proc.Rn);
+ rn = sim->get_reg_mode(sim, instruction.info.data_proc.rn);
else
- Rn = 0;
+ rn = 0;
shifter_operand = arm_shifter_operand(sim,
instruction.info.data_proc.variant,
&carry_out);
/* adjust Rn in case the PC is being read */
- if (instruction.info.data_proc.Rn == 15)
- Rn += 2 * instruction_size;
+ if (instruction.info.data_proc.rn == 15)
+ rn += 2 * instruction_size;
if (instruction.type == ARM_AND)
- Rd = Rn & shifter_operand;
+ rd = rn & shifter_operand;
else if (instruction.type == ARM_EOR)
- Rd = Rn ^ shifter_operand;
+ rd = rn ^ shifter_operand;
else if (instruction.type == ARM_SUB)
- Rd = Rn - shifter_operand;
+ rd = rn - shifter_operand;
else if (instruction.type == ARM_RSB)
- Rd = shifter_operand - Rn;
+ rd = shifter_operand - rn;
else if (instruction.type == ARM_ADD)
- Rd = Rn + shifter_operand;
+ rd = rn + shifter_operand;
else if (instruction.type == ARM_ADC)
- Rd = Rn + shifter_operand + (C & 1);
+ rd = rn + shifter_operand + (c & 1);
else if (instruction.type == ARM_SBC)
- Rd = Rn - shifter_operand - (C & 1) ? 0 : 1;
+ rd = rn - shifter_operand - (c & 1) ? 0 : 1;
else if (instruction.type == ARM_RSC)
- Rd = shifter_operand - Rn - (C & 1) ? 0 : 1;
+ rd = shifter_operand - rn - (c & 1) ? 0 : 1;
else if (instruction.type == ARM_ORR)
- Rd = Rn | shifter_operand;
+ rd = rn | shifter_operand;
else if (instruction.type == ARM_BIC)
- Rd = Rn & ~(shifter_operand);
+ rd = rn & ~(shifter_operand);
else if (instruction.type == ARM_MOV)
- Rd = shifter_operand;
+ rd = shifter_operand;
else if (instruction.type == ARM_MVN)
- Rd = ~shifter_operand;
+ rd = ~shifter_operand;
else
LOG_WARNING("unhandled instruction type");
if (dry_run_pc) {
- if (instruction.info.data_proc.Rd == 15)
- *dry_run_pc = Rd & ~1;
+ if (instruction.info.data_proc.rd == 15)
+ *dry_run_pc = rd & ~1;
else
*dry_run_pc = current_pc + instruction_size;
return ERROR_OK;
} else {
- if (instruction.info.data_proc.Rd == 15) {
- sim->set_reg_mode(sim, 15, Rd & ~1);
- if (Rd & 1)
+ if (instruction.info.data_proc.rd == 15) {
+ sim->set_reg_mode(sim, 15, rd & ~1);
+ if (rd & 1)
sim->set_state(sim, ARM_STATE_THUMB);
else
sim->set_state(sim, ARM_STATE_ARM);
return ERROR_OK;
}
- sim->set_reg_mode(sim, instruction.info.data_proc.Rd, Rd);
+ sim->set_reg_mode(sim, instruction.info.data_proc.rd, rd);
LOG_WARNING("no updating of flags yet");
}
}
/* load register instructions */
else if ((instruction.type >= ARM_LDR) && (instruction.type <= ARM_LDRSH)) {
uint32_t load_address = 0, modified_address = 0, load_value = 0;
- uint32_t Rn = sim->get_reg_mode(sim, instruction.info.load_store.Rn);
+ uint32_t rn = sim->get_reg_mode(sim, instruction.info.load_store.rn);
/* adjust Rn in case the PC is being read */
- if (instruction.info.load_store.Rn == 15)
- Rn += 2 * instruction_size;
+ if (instruction.info.load_store.rn == 15)
+ rn += 2 * instruction_size;
if (instruction.info.load_store.offset_mode == 0) {
- if (instruction.info.load_store.U)
- modified_address = Rn + instruction.info.load_store.offset.offset;
+ if (instruction.info.load_store.u)
+ modified_address = rn + instruction.info.load_store.offset.offset;
else
- modified_address = Rn - instruction.info.load_store.offset.offset;
+ modified_address = rn - instruction.info.load_store.offset.offset;
} else if (instruction.info.load_store.offset_mode == 1) {
uint32_t offset;
- uint32_t Rm = sim->get_reg_mode(sim,
- instruction.info.load_store.offset.reg.Rm);
+ uint32_t rm = sim->get_reg_mode(sim,
+ instruction.info.load_store.offset.reg.rm);
uint8_t shift = instruction.info.load_store.offset.reg.shift;
uint8_t shift_imm = instruction.info.load_store.offset.reg.shift_imm;
uint8_t carry = sim->get_cpsr(sim, 29, 1);
- offset = arm_shift(shift, Rm, shift_imm, &carry);
+ offset = arm_shift(shift, rm, shift_imm, &carry);
- if (instruction.info.load_store.U)
- modified_address = Rn + offset;
+ if (instruction.info.load_store.u)
+ modified_address = rn + offset;
else
- modified_address = Rn - offset;
+ modified_address = rn - offset;
} else
LOG_ERROR("BUG: offset_mode neither 0 (offset) nor 1 (scaled register)");
* the base address register
*/
load_address = modified_address;
- modified_address = Rn;
+ modified_address = rn;
} else if (instruction.info.load_store.index_mode == 1) {
/* pre-indexed mode
* we load from the modified address, and write it
* we load from the unmodified address, and write the
* modified address back
*/
- load_address = Rn;
+ load_address = rn;
}
- if ((!dry_run_pc) || (instruction.info.load_store.Rd == 15)) {
+ if ((!dry_run_pc) || (instruction.info.load_store.rd == 15)) {
retval = target_read_u32(target, load_address, &load_value);
if (retval != ERROR_OK)
return retval;
}
if (dry_run_pc) {
- if (instruction.info.load_store.Rd == 15)
+ if (instruction.info.load_store.rd == 15)
*dry_run_pc = load_value & ~1;
else
*dry_run_pc = current_pc + instruction_size;
if ((instruction.info.load_store.index_mode == 1) ||
(instruction.info.load_store.index_mode == 2))
sim->set_reg_mode(sim,
- instruction.info.load_store.Rn,
+ instruction.info.load_store.rn,
modified_address);
- if (instruction.info.load_store.Rd == 15) {
+ if (instruction.info.load_store.rd == 15) {
sim->set_reg_mode(sim, 15, load_value & ~1);
if (load_value & 1)
sim->set_state(sim, ARM_STATE_THUMB);
sim->set_state(sim, ARM_STATE_ARM);
return ERROR_OK;
}
- sim->set_reg_mode(sim, instruction.info.load_store.Rd, load_value);
+ sim->set_reg_mode(sim, instruction.info.load_store.rd, load_value);
}
}
/* load multiple instruction */
else if (instruction.type == ARM_LDM) {
int i;
- uint32_t Rn = sim->get_reg_mode(sim, instruction.info.load_store_multiple.Rn);
+ uint32_t rn = sim->get_reg_mode(sim, instruction.info.load_store_multiple.rn);
uint32_t load_values[16];
int bits_set = 0;
switch (instruction.info.load_store_multiple.addressing_mode) {
case 0: /* Increment after */
- /* Rn = Rn; */
+ /* rn = rn; */
break;
case 1: /* Increment before */
- Rn = Rn + 4;
+ rn = rn + 4;
break;
case 2: /* Decrement after */
- Rn = Rn - (bits_set * 4) + 4;
+ rn = rn - (bits_set * 4) + 4;
break;
case 3: /* Decrement before */
- Rn = Rn - (bits_set * 4);
+ rn = rn - (bits_set * 4);
break;
}
for (i = 0; i < 16; i++) {
if (instruction.info.load_store_multiple.register_list & (1 << i)) {
if ((!dry_run_pc) || (i == 15))
- target_read_u32(target, Rn, &load_values[i]);
- Rn += 4;
+ target_read_u32(target, rn, &load_values[i]);
+ rn += 4;
}
}
} else {
int update_cpsr = 0;
- if (instruction.info.load_store_multiple.S) {
+ if (instruction.info.load_store_multiple.s) {
if (instruction.info.load_store_multiple.register_list & 0x8000)
update_cpsr = 1;
}
}
/* base register writeback */
- if (instruction.info.load_store_multiple.W)
- sim->set_reg_mode(sim, instruction.info.load_store_multiple.Rn, Rn);
+ if (instruction.info.load_store_multiple.w)
+ sim->set_reg_mode(sim, instruction.info.load_store_multiple.rn, rn);
if (instruction.info.load_store_multiple.register_list & 0x8000)
if (dry_run_pc) {
/* STM wont affect PC (advance by instruction size */
} else {
- uint32_t Rn = sim->get_reg_mode(sim,
- instruction.info.load_store_multiple.Rn);
+ uint32_t rn = sim->get_reg_mode(sim,
+ instruction.info.load_store_multiple.rn);
int bits_set = 0;
for (i = 0; i < 16; i++) {
switch (instruction.info.load_store_multiple.addressing_mode) {
case 0: /* Increment after */
- /* Rn = Rn; */
+ /* rn = rn; */
break;
case 1: /* Increment before */
- Rn = Rn + 4;
+ rn = rn + 4;
break;
case 2: /* Decrement after */
- Rn = Rn - (bits_set * 4) + 4;
+ rn = rn - (bits_set * 4) + 4;
break;
case 3: /* Decrement before */
- Rn = Rn - (bits_set * 4);
+ rn = rn - (bits_set * 4);
break;
}
for (i = 0; i < 16; i++) {
if (instruction.info.load_store_multiple.register_list & (1 << i)) {
- target_write_u32(target, Rn, sim->get_reg_mode(sim, i));
- Rn += 4;
+ target_write_u32(target, rn, sim->get_reg_mode(sim, i));
+ rn += 4;
}
}
/* base register writeback */
- if (instruction.info.load_store_multiple.W)
+ if (instruction.info.load_store_multiple.w)
sim->set_reg_mode(sim,
- instruction.info.load_store_multiple.Rn, Rn);
+ instruction.info.load_store_multiple.rn, rn);
}
} else if (!dry_run_pc) {
projects / fw / openocd / blobdiff