arm966e.c

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// SPDX-License-Identifier: GPL-2.0-or-later
 
/***************************************************************************
 *   Copyright (C) 2005 by Dominic Rath                                    *
 *   Dominic.Rath@gmx.de                                                   *
 *                                                                         *
 *   Copyright (C) 2008 by Spencer Oliver                                  *
 *   spen@spen-soft.co.uk                                                  *
 ***************************************************************************/
 
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
 
#include "arm966e.h"
#include "target_type.h"
#include "arm_opcodes.h"
 
#if 0
#define _DEBUG_INSTRUCTION_EXECUTION_
#endif
 
int arm966e_init_arch_info(struct target *target, struct arm966e_common *arm966e, struct jtag_tap *tap)
{
    struct arm7_9_common *arm7_9 = &arm966e->arm7_9_common;
 
    /* initialize arm7/arm9 specific info (including armv4_5) */
    arm9tdmi_init_arch_info(target, arm7_9, tap);
 
    arm966e->common_magic = ARM966E_COMMON_MAGIC;
 
    /* The ARM966E-S implements the ARMv5TE architecture which
     * has the BKPT instruction, so we don't have to use a watchpoint comparator
     */
    arm7_9->arm_bkpt = ARMV5_BKPT(0x0);
    arm7_9->thumb_bkpt = ARMV5_T_BKPT(0x0) & 0xffff;
 
    return ERROR_OK;
}
 
static int arm966e_target_create(struct target *target, Jim_Interp *interp)
{
    struct arm966e_common *arm966e = calloc(1, sizeof(struct arm966e_common));
 
    return arm966e_init_arch_info(target, arm966e, target->tap);
}
 
static void arm966e_deinit_target(struct target *target)
{
    struct arm *arm = target_to_arm(target);
    struct arm966e_common *arm966e = target_to_arm966(target);
 
    arm7_9_deinit(target);
    arm_free_reg_cache(arm);
    free(arm966e);
}
 
static int arm966e_verify_pointer(struct command_invocation *cmd,
        struct arm966e_common *arm966e)
{
    if (arm966e->common_magic != ARM966E_COMMON_MAGIC) {
        command_print(cmd, "target is not an ARM966");
        return ERROR_TARGET_INVALID;
    }
    return ERROR_OK;
}
 
/*
 * REVISIT:  The "read_cp15" and "write_cp15" commands could hook up
 * to eventual mrc() and mcr() routines ... the reg_addr values being
 * constructed (for CP15 only) from Opcode_1, Opcode_2, and CRn values.
 * See section 7.3 of the ARM966E-S TRM.
 */
 
static int arm966e_read_cp15(struct target *target, int reg_addr, uint32_t *value)
{
    int retval = ERROR_OK;
    struct arm7_9_common *arm7_9 = target_to_arm7_9(target);
    struct arm_jtag *jtag_info = &arm7_9->jtag_info;
    struct scan_field fields[3];
    uint8_t reg_addr_buf = reg_addr & 0x3f;
    uint8_t nr_w_buf = 0;
 
    retval = arm_jtag_scann(jtag_info, 0xf, TAP_IDLE);
    if (retval != ERROR_OK)
        return retval;
    retval = arm_jtag_set_instr(jtag_info->tap, jtag_info->intest_instr, NULL, TAP_IDLE);
    if (retval != ERROR_OK)
        return retval;
 
    fields[0].num_bits = 32;
    /* REVISIT: table 7-2 shows that bits 31-31 need to be
     * specified for accessing BIST registers ...
     */
    fields[0].out_value = NULL;
    fields[0].in_value = NULL;
 
    fields[1].num_bits = 6;
    fields[1].out_value = &reg_addr_buf;
    fields[1].in_value = NULL;
 
    fields[2].num_bits = 1;
    fields[2].out_value = &nr_w_buf;
    fields[2].in_value = NULL;
 
    jtag_add_dr_scan(jtag_info->tap, 3, fields, TAP_IDLE);
 
    fields[1].in_value = (uint8_t *)value;
 
    jtag_add_dr_scan(jtag_info->tap, 3, fields, TAP_IDLE);
 
    jtag_add_callback(arm_le_to_h_u32, (jtag_callback_data_t)value);
 
 
#ifdef _DEBUG_INSTRUCTION_EXECUTION_
    retval = jtag_execute_queue();
    if (retval != ERROR_OK)
        return retval;
    LOG_DEBUG("addr: 0x%x value: %8.8x", reg_addr, *value);
#endif
 
    return ERROR_OK;
}
 
/* EXPORTED to str9x (flash) */
int arm966e_write_cp15(struct target *target, int reg_addr, uint32_t value)
{
    int retval = ERROR_OK;
    struct arm7_9_common *arm7_9 = target_to_arm7_9(target);
    struct arm_jtag *jtag_info = &arm7_9->jtag_info;
    struct scan_field fields[3];
    uint8_t reg_addr_buf = reg_addr & 0x3f;
    uint8_t nr_w_buf = 1;
    uint8_t value_buf[4];
 
    buf_set_u32(value_buf, 0, 32, value);
 
    retval = arm_jtag_scann(jtag_info, 0xf, TAP_IDLE);
    if (retval != ERROR_OK)
        return retval;
    retval = arm_jtag_set_instr(jtag_info->tap, jtag_info->intest_instr, NULL, TAP_IDLE);
    if (retval != ERROR_OK)
        return retval;
 
    fields[0].num_bits = 32;
    fields[0].out_value = value_buf;
    fields[0].in_value = NULL;
 
    fields[1].num_bits = 6;
    fields[1].out_value = &reg_addr_buf;
    fields[1].in_value = NULL;
 
    fields[2].num_bits = 1;
    fields[2].out_value = &nr_w_buf;
    fields[2].in_value = NULL;
 
    jtag_add_dr_scan(jtag_info->tap, 3, fields, TAP_IDLE);
 
#ifdef _DEBUG_INSTRUCTION_EXECUTION_
    LOG_DEBUG("addr: 0x%x value: %8.8x", reg_addr, value);
#endif
 
    return ERROR_OK;
}
 
COMMAND_HANDLER(arm966e_handle_cp15_command)
{
    int retval;
    struct target *target = get_current_target(CMD_CTX);
    struct arm966e_common *arm966e = target_to_arm966(target);
 
    retval = arm966e_verify_pointer(CMD, arm966e);
    if (retval != ERROR_OK)
        return retval;
 
    if (target->state != TARGET_HALTED) {
        command_print(CMD, "Error: target must be stopped for \"%s\" command", CMD_NAME);
        return ERROR_TARGET_NOT_HALTED;
    }
 
    /* one or more argument, access a single register (write if second argument is given */
    if (CMD_ARGC >= 1) {
        uint32_t address;
        COMMAND_PARSE_NUMBER(u32, CMD_ARGV[0], address);
 
        if (CMD_ARGC == 1) {
            uint32_t value;
            retval = arm966e_read_cp15(target, address, &value);
            if (retval != ERROR_OK) {
                command_print(CMD,
                        "couldn't access reg %" PRIu32,
                        address);
                return ERROR_OK;
            }
            retval = jtag_execute_queue();
            if (retval != ERROR_OK)
                return retval;
 
            command_print(CMD, "%" PRIu32 ": %8.8" PRIx32,
                    address, value);
        } else if (CMD_ARGC == 2) {
            uint32_t value;
            COMMAND_PARSE_NUMBER(u32, CMD_ARGV[1], value);
            retval = arm966e_write_cp15(target, address, value);
            if (retval != ERROR_OK) {
                command_print(CMD,
                        "couldn't access reg %" PRIu32,
                        address);
                return ERROR_OK;
            }
            command_print(CMD, "%" PRIu32 ": %8.8" PRIx32,
                    address, value);
        }
    }
 
    return ERROR_OK;
}
 
static const struct command_registration arm966e_exec_command_handlers[] = {
    {
        .name = "cp15",
        .handler = arm966e_handle_cp15_command,
        .mode = COMMAND_EXEC,
        .usage = "regnum [value]",
        .help = "display/modify cp15 register",
    },
    COMMAND_REGISTRATION_DONE
};
 
const struct command_registration arm966e_command_handlers[] = {
    {
        .chain = arm9tdmi_command_handlers,
    },
    {
        .name = "arm966e",
        .mode = COMMAND_ANY,
        .help = "arm966e command group",
        .usage = "",
        .chain = arm966e_exec_command_handlers,
    },
    COMMAND_REGISTRATION_DONE
};
 
struct target_type arm966e_target = {
    .name = "arm966e",
 
    .poll = arm7_9_poll,
    .arch_state = arm_arch_state,
 
    .target_request_data = arm7_9_target_request_data,
 
    .halt = arm7_9_halt,
    .resume = arm7_9_resume,
    .step = arm7_9_step,
 
    .assert_reset = arm7_9_assert_reset,
    .deassert_reset = arm7_9_deassert_reset,
    .soft_reset_halt = arm7_9_soft_reset_halt,
 
    .get_gdb_arch = arm_get_gdb_arch,
    .get_gdb_reg_list = arm_get_gdb_reg_list,
 
    .read_memory = arm7_9_read_memory,
    .write_memory = arm7_9_write_memory_opt,
 
    .checksum_memory = arm_checksum_memory,
    .blank_check_memory = arm_blank_check_memory,
 
    .run_algorithm = armv4_5_run_algorithm,
 
    .add_breakpoint = arm7_9_add_breakpoint,
    .remove_breakpoint = arm7_9_remove_breakpoint,
    .add_watchpoint = arm7_9_add_watchpoint,
    .remove_watchpoint = arm7_9_remove_watchpoint,
 
    .commands = arm966e_command_handlers,
    .target_create = arm966e_target_create,
    .init_target = arm9tdmi_init_target,
    .deinit_target = arm966e_deinit_target,
    .examine = arm7_9_examine,
    .check_reset = arm7_9_check_reset,
};