arm11_dbgtap.c

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// SPDX-License-Identifier: GPL-2.0-or-later
 
/***************************************************************************
 *   Copyright (C) 2008 digenius technology GmbH.                          *
 *   Michael Bruck                                                         *
 *                                                                         *
 *   Copyright (C) 2008,2009 Oyvind Harboe oyvind.harboe@zylin.com         *
 ***************************************************************************/
 
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
 
#include "arm_jtag.h"
#include "arm11_dbgtap.h"
 
#include <helper/time_support.h>
 
#if 0
#define JTAG_DEBUG(expr ...)    do { if (1) \
                         LOG_DEBUG(expr); } while (0)
#else
#define JTAG_DEBUG(expr ...)    do { if (0) \
                         LOG_DEBUG(expr); } while (0)
#endif
 
/*
This pathmove goes from Pause-IR to Shift-IR while avoiding RTI. The
behavior of the FTDI driver IIRC was to go via RTI.
 
Conversely there may be other places in this code where the ARM11 code relies
on the driver to hit through RTI when coming from Update-?R.
*/
static const tap_state_t arm11_move_pi_to_si_via_ci[] = {
    TAP_IREXIT2, TAP_IRUPDATE, TAP_DRSELECT, TAP_IRSELECT, TAP_IRCAPTURE, TAP_IRSHIFT
};
 
/* REVISIT no error handling here! */
static void arm11_add_ir_scan_vc(struct jtag_tap *tap, struct scan_field *fields,
    tap_state_t state)
{
    if (cmd_queue_cur_state == TAP_IRPAUSE)
        jtag_add_pathmove(ARRAY_SIZE(arm11_move_pi_to_si_via_ci),
            arm11_move_pi_to_si_via_ci);
 
    jtag_add_ir_scan(tap, fields, state);
}
 
static const tap_state_t arm11_move_pd_to_sd_via_cd[] = {
    TAP_DREXIT2, TAP_DRUPDATE, TAP_DRSELECT, TAP_DRCAPTURE, TAP_DRSHIFT
};
 
/* REVISIT no error handling here! */
void arm11_add_dr_scan_vc(struct jtag_tap *tap, int num_fields, struct scan_field *fields,
    tap_state_t state)
{
    if (cmd_queue_cur_state == TAP_DRPAUSE)
        jtag_add_pathmove(ARRAY_SIZE(arm11_move_pd_to_sd_via_cd),
            arm11_move_pd_to_sd_via_cd);
 
    jtag_add_dr_scan(tap, num_fields, fields, state);
}
 
 
void arm11_setup_field(struct arm11_common *arm11, int num_bits,
    void *out_data, void *in_data, struct scan_field *field)
{
    field->num_bits                 = num_bits;
    field->out_value                = out_data;
    field->in_value                 = in_data;
}
 
static const char *arm11_ir_to_string(uint8_t ir)
{
    const char *s = "unknown";
 
    switch (ir) {
        case ARM11_EXTEST:
            s = "EXTEST";
            break;
        case ARM11_SCAN_N:
            s = "SCAN_N";
            break;
        case ARM11_RESTART:
            s = "RESTART";
            break;
        case ARM11_HALT:
            s = "HALT";
            break;
        case ARM11_INTEST:
            s = "INTEST";
            break;
        case ARM11_ITRSEL:
            s = "ITRSEL";
            break;
        case ARM11_IDCODE:
            s = "IDCODE";
            break;
        case ARM11_BYPASS:
            s = "BYPASS";
            break;
    }
    return s;
}
 
void arm11_add_ir(struct arm11_common *arm11, uint8_t instr, tap_state_t state)
{
    struct jtag_tap *tap = arm11->arm.target->tap;
 
    if (buf_get_u32(tap->cur_instr, 0, 5) == instr) {
        JTAG_DEBUG("IR <= 0x%02x SKIPPED", instr);
        return;
    }
 
    JTAG_DEBUG("IR <= %s (0x%02x)", arm11_ir_to_string(instr), instr);
 
    struct scan_field field;
 
    arm11_setup_field(arm11, 5, &instr, NULL, &field);
 
    arm11_add_ir_scan_vc(arm11->arm.target->tap,
        &field,
        state == ARM11_TAP_DEFAULT ? TAP_IRPAUSE : state);
}
 
static void arm11_in_handler_scan_n(uint8_t *in_value)
{
    /* Don't expect JTAG layer to modify bits we didn't ask it to read */
    uint8_t v = *in_value & 0x1F;
 
    if (v != 0x10) {
        LOG_ERROR("'arm11 target' JTAG error SCREG OUT 0x%02x", v);
        jtag_set_error(ERROR_FAIL);
    }
}
 
int arm11_add_debug_scan_n(struct arm11_common *arm11,
    uint8_t chain, tap_state_t state)
{
    /* Don't needlessly switch the scan chain.
     * NOTE:  the ITRSEL instruction fakes SCREG changing;
     * but leaves its actual value unchanged.
     */
#if 0
    /* FIX!!! the optimization below is broken because we do not */
    /* invalidate the cur_scan_chain upon a TRST/TMS. See arm_jtag.c */
    /* for example on how to invalidate cur_scan_chain. Tested patches gladly */
    /* accepted! */
    if (arm11->jtag_info.cur_scan_chain == chain) {
        JTAG_DEBUG("SCREG <= %d SKIPPED", chain);
        return jtag_add_statemove((state == ARM11_TAP_DEFAULT)
            ? TAP_DRPAUSE : state);
    }
#endif
    JTAG_DEBUG("SCREG <= %d", chain);
 
    arm11_add_ir(arm11, ARM11_SCAN_N, ARM11_TAP_DEFAULT);
 
    struct scan_field field;
 
    uint8_t tmp[1];
    arm11_setup_field(arm11, 5, &chain, &tmp, &field);
 
    arm11_add_dr_scan_vc(arm11->arm.target->tap,
        1,
        &field,
        state == ARM11_TAP_DEFAULT ? TAP_DRPAUSE : state);
 
    jtag_execute_queue_noclear();
 
    arm11_in_handler_scan_n(tmp);
 
    arm11->jtag_info.cur_scan_chain = chain;
 
    return jtag_execute_queue();
}
 
static void arm11_add_debug_inst(struct arm11_common *arm11,
    uint32_t inst, uint8_t *flag, tap_state_t state)
{
    JTAG_DEBUG("INST <= 0x%08x", (unsigned) inst);
 
    struct scan_field itr[2];
 
    arm11_setup_field(arm11, 32, &inst, NULL, itr + 0);
    arm11_setup_field(arm11, 1, NULL, flag, itr + 1);
 
    arm11_add_dr_scan_vc(arm11->arm.target->tap, ARRAY_SIZE(itr), itr, state);
}
 
int arm11_read_dscr(struct arm11_common *arm11)
{
    int retval;
 
    retval = arm11_add_debug_scan_n(arm11, 0x01, ARM11_TAP_DEFAULT);
    if (retval != ERROR_OK)
        return retval;
 
    arm11_add_ir(arm11, ARM11_INTEST, ARM11_TAP_DEFAULT);
 
    uint32_t dscr;
    struct scan_field chain1_field;
 
    arm11_setup_field(arm11, 32, NULL, &dscr, &chain1_field);
 
    arm11_add_dr_scan_vc(arm11->arm.target->tap, 1, &chain1_field, TAP_DRPAUSE);
 
    CHECK_RETVAL(jtag_execute_queue());
 
    if (arm11->dscr != dscr)
        JTAG_DEBUG("DSCR  = %08x (OLD %08x)",
            (unsigned) dscr,
            (unsigned) arm11->dscr);
 
    arm11->dscr = dscr;
 
    return ERROR_OK;
}
 
int arm11_write_dscr(struct arm11_common *arm11, uint32_t dscr)
{
    int retval;
    retval = arm11_add_debug_scan_n(arm11, 0x01, ARM11_TAP_DEFAULT);
    if (retval != ERROR_OK)
        return retval;
 
    arm11_add_ir(arm11, ARM11_EXTEST, ARM11_TAP_DEFAULT);
 
    struct scan_field chain1_field;
 
    arm11_setup_field(arm11, 32, &dscr, NULL, &chain1_field);
 
    arm11_add_dr_scan_vc(arm11->arm.target->tap, 1, &chain1_field, TAP_DRPAUSE);
 
    CHECK_RETVAL(jtag_execute_queue());
 
    JTAG_DEBUG("DSCR <= %08x (OLD %08x)",
        (unsigned) dscr,
        (unsigned) arm11->dscr);
 
    arm11->dscr = dscr;
 
    return ERROR_OK;
}
 
int arm11_run_instr_data_prepare(struct arm11_common *arm11)
{
    return arm11_add_debug_scan_n(arm11, 0x05, ARM11_TAP_DEFAULT);
}
 
int arm11_run_instr_data_finish(struct arm11_common *arm11)
{
    return arm11_add_debug_scan_n(arm11, 0x00, ARM11_TAP_DEFAULT);
}
 
static
int arm11_run_instr_no_data(struct arm11_common *arm11,
    uint32_t *opcode, size_t count)
{
    arm11_add_ir(arm11, ARM11_ITRSEL, ARM11_TAP_DEFAULT);
 
    while (count--) {
        arm11_add_debug_inst(arm11, *opcode++, NULL, TAP_IDLE);
 
        int i = 0;
        while (1) {
            uint8_t flag;
 
            arm11_add_debug_inst(arm11, 0, &flag, count ? TAP_IDLE : TAP_DRPAUSE);
 
            CHECK_RETVAL(jtag_execute_queue());
 
            if (flag)
                break;
 
            int64_t then = 0;
 
            if (i == 1000)
                then = timeval_ms();
            if (i >= 1000) {
                if ((timeval_ms()-then) > 1000) {
                    LOG_WARNING(
                        "Timeout (1000ms) waiting for instructions to complete");
                    return ERROR_FAIL;
                }
            }
 
            i++;
        }
    }
 
    return ERROR_OK;
}
 
int arm11_run_instr_no_data1(struct arm11_common *arm11, uint32_t opcode)
{
    return arm11_run_instr_no_data(arm11, &opcode, 1);
}
 
 
int arm11_run_instr_data_to_core(struct arm11_common *arm11,
    uint32_t opcode,
    uint32_t *data,
    size_t count)
{
    arm11_add_ir(arm11, ARM11_ITRSEL, ARM11_TAP_DEFAULT);
 
    arm11_add_debug_inst(arm11, opcode, NULL, TAP_DRPAUSE);
 
    arm11_add_ir(arm11, ARM11_EXTEST, ARM11_TAP_DEFAULT);
 
    struct scan_field chain5_fields[3];
 
    uint32_t _data;
    uint8_t ready;
    uint8_t n_retry;
 
    arm11_setup_field(arm11, 32,    &_data, NULL,           chain5_fields + 0);
    arm11_setup_field(arm11,  1,    NULL,   &ready,         chain5_fields + 1);
    arm11_setup_field(arm11,  1,    NULL,   &n_retry,       chain5_fields + 2);
 
    while (count--) {
        int i = 0;
        do {
            _data        = *data;
 
            arm11_add_dr_scan_vc(arm11->arm.target->tap, ARRAY_SIZE(
                    chain5_fields), chain5_fields, TAP_IDLE);
 
            CHECK_RETVAL(jtag_execute_queue());
 
            JTAG_DEBUG("DTR  ready %d  n_retry %d", ready, n_retry);
 
            int64_t then = 0;
 
            if (i == 1000)
                then = timeval_ms();
            if (i >= 1000) {
                if ((timeval_ms()-then) > 1000) {
                    LOG_WARNING(
                        "Timeout (1000ms) waiting for instructions to complete");
                    return ERROR_FAIL;
                }
            }
 
            i++;
        } while (!ready);
 
        data++;
    }
 
    arm11_add_ir(arm11, ARM11_INTEST, ARM11_TAP_DEFAULT);
 
    int i = 0;
    do {
        _data        = 0;
 
        arm11_add_dr_scan_vc(arm11->arm.target->tap, ARRAY_SIZE(
                chain5_fields), chain5_fields, TAP_DRPAUSE);
 
        CHECK_RETVAL(jtag_execute_queue());
 
        JTAG_DEBUG("DTR  _data %08x  ready %d  n_retry %d",
            (unsigned) _data, ready, n_retry);
 
        int64_t then = 0;
 
        if (i == 1000)
            then = timeval_ms();
        if (i >= 1000) {
            if ((timeval_ms()-then) > 1000) {
                LOG_WARNING("Timeout (1000ms) waiting for instructions to complete");
                return ERROR_FAIL;
            }
        }
 
        i++;
    } while (!ready);
 
    return ERROR_OK;
}
 
static const tap_state_t arm11_move_drpause_idle_drpause_with_delay[] = {
    TAP_DREXIT2, TAP_DRUPDATE, TAP_IDLE, TAP_IDLE, TAP_IDLE, TAP_DRSELECT, TAP_DRCAPTURE,
    TAP_DRSHIFT
};
 
static int arm11_run_instr_data_to_core_noack_inner(struct jtag_tap *tap,
    uint32_t opcode,
    uint32_t *data,
    size_t count)
{
    struct scan_field chain5_fields[3];
 
    chain5_fields[0].num_bits               = 32;
    chain5_fields[0].out_value              = NULL; /*&Data*/
    chain5_fields[0].in_value               = NULL;
 
    chain5_fields[1].num_bits               = 1;
    chain5_fields[1].out_value              = NULL;
    chain5_fields[1].in_value               = NULL; /*&Ready*/
 
    chain5_fields[2].num_bits               = 1;
    chain5_fields[2].out_value              = NULL;
    chain5_fields[2].in_value               = NULL;
 
    uint8_t *readies;
    unsigned readies_num = count;
    unsigned bytes = sizeof(*readies)*readies_num;
 
    readies = malloc(bytes);
    if (!readies) {
        LOG_ERROR("Out of memory allocating %u bytes", bytes);
        return ERROR_FAIL;
    }
 
    uint8_t *ready_pos                      = readies;
    while (count--) {
        chain5_fields[0].out_value      = (uint8_t *)(data++);
        chain5_fields[1].in_value       = ready_pos++;
 
        if (count > 0) {
            jtag_add_dr_scan(tap, ARRAY_SIZE(chain5_fields), chain5_fields,
                TAP_DRPAUSE);
            jtag_add_pathmove(ARRAY_SIZE(arm11_move_drpause_idle_drpause_with_delay),
                arm11_move_drpause_idle_drpause_with_delay);
        } else
            jtag_add_dr_scan(tap, ARRAY_SIZE(chain5_fields), chain5_fields, TAP_IDLE);
    }
 
    int retval = jtag_execute_queue();
    if (retval == ERROR_OK) {
        unsigned error_count = 0;
 
        for (size_t i = 0; i < readies_num; i++) {
            if (readies[i] != 1)
                error_count++;
        }
 
        if (error_count > 0) {
            LOG_ERROR("%u words out of %u not transferred",
                error_count, readies_num);
            retval = ERROR_FAIL;
        }
    }
    free(readies);
 
    return retval;
}
 
int arm11_run_instr_data_to_core_noack(struct arm11_common *arm11,
    uint32_t opcode,
    uint32_t *data,
    size_t count)
{
    arm11_add_ir(arm11, ARM11_ITRSEL, ARM11_TAP_DEFAULT);
 
    arm11_add_debug_inst(arm11, opcode, NULL, TAP_DRPAUSE);
 
    arm11_add_ir(arm11, ARM11_EXTEST, ARM11_TAP_DEFAULT);
 
    int retval = arm11_run_instr_data_to_core_noack_inner(arm11->arm.target->tap,
            opcode,
            data,
            count);
 
    if (retval != ERROR_OK)
        return retval;
 
    arm11_add_ir(arm11, ARM11_INTEST, ARM11_TAP_DEFAULT);
 
    struct scan_field chain5_fields[3];
 
    arm11_setup_field(arm11,
        32,
        NULL /*&Data*/,
        NULL,
        chain5_fields + 0);
    arm11_setup_field(arm11,
        1,
        NULL,
        NULL /*&Ready*/,
        chain5_fields + 1);
    arm11_setup_field(arm11,
        1,
        NULL,
        NULL,
        chain5_fields + 2);
 
    uint8_t ready_flag;
    chain5_fields[1].in_value   = &ready_flag;
 
    arm11_add_dr_scan_vc(arm11->arm.target->tap, ARRAY_SIZE(
            chain5_fields), chain5_fields, TAP_DRPAUSE);
 
    retval = jtag_execute_queue();
    if (retval == ERROR_OK) {
        if (ready_flag != 1) {
            LOG_ERROR("last word not transferred");
            retval = ERROR_FAIL;
        }
    }
 
    return retval;
}
 
 
int arm11_run_instr_data_to_core1(struct arm11_common *arm11, uint32_t opcode, uint32_t data)
{
    return arm11_run_instr_data_to_core(arm11, opcode, &data, 1);
}
 
 
int arm11_run_instr_data_from_core(struct arm11_common *arm11,
    uint32_t opcode,
    uint32_t *data,
    size_t count)
{
    arm11_add_ir(arm11, ARM11_ITRSEL, ARM11_TAP_DEFAULT);
 
    arm11_add_debug_inst(arm11, opcode, NULL, TAP_IDLE);
 
    arm11_add_ir(arm11, ARM11_INTEST, ARM11_TAP_DEFAULT);
 
    struct scan_field chain5_fields[3];
 
    uint32_t _data;
    uint8_t ready;
    uint8_t n_retry;
 
    arm11_setup_field(arm11, 32,    NULL,   &_data,     chain5_fields + 0);
    arm11_setup_field(arm11,  1,    NULL,   &ready,     chain5_fields + 1);
    arm11_setup_field(arm11,  1,    NULL,   &n_retry,   chain5_fields + 2);
 
    while (count--) {
        int i = 0;
        do {
            arm11_add_dr_scan_vc(arm11->arm.target->tap, ARRAY_SIZE(
                    chain5_fields), chain5_fields,
                count ? TAP_IDLE : TAP_DRPAUSE);
 
            CHECK_RETVAL(jtag_execute_queue());
 
            JTAG_DEBUG("DTR  _data %08x  ready %d  n_retry %d",
                (unsigned) _data, ready, n_retry);
 
            int64_t then = 0;
 
            if (i == 1000)
                then = timeval_ms();
            if (i >= 1000) {
                if ((timeval_ms()-then) > 1000) {
                    LOG_WARNING(
                        "Timeout (1000ms) waiting for instructions to complete");
                    return ERROR_FAIL;
                }
            }
 
            i++;
        } while (!ready);
 
        *data++ = _data;
    }
 
    return ERROR_OK;
}
 
int arm11_run_instr_data_from_core_via_r0(struct arm11_common *arm11,
    uint32_t opcode,
    uint32_t *data)
{
    int retval;
    retval = arm11_run_instr_no_data1(arm11, opcode);
    if (retval != ERROR_OK)
        return retval;
 
    /* MCR p14,0,R0,c0,c5,0 (move r0 -> wDTR -> local var) */
    arm11_run_instr_data_from_core(arm11, 0xEE000E15, data, 1);
 
    return ERROR_OK;
}
 
int arm11_run_instr_data_to_core_via_r0(struct arm11_common *arm11, uint32_t opcode, uint32_t data)
{
    int retval;
    /* MRC p14,0,r0,c0,c5,0 */
    retval = arm11_run_instr_data_to_core1(arm11, 0xEE100E15, data);
    if (retval != ERROR_OK)
        return retval;
 
    retval = arm11_run_instr_no_data1(arm11, opcode);
    if (retval != ERROR_OK)
        return retval;
 
    return ERROR_OK;
}
 
int arm11_sc7_run(struct arm11_common *arm11, struct arm11_sc7_action *actions, size_t count)
{
    int retval;
 
    retval = arm11_add_debug_scan_n(arm11, 0x07, ARM11_TAP_DEFAULT);
    if (retval != ERROR_OK)
        return retval;
 
    arm11_add_ir(arm11, ARM11_EXTEST, ARM11_TAP_DEFAULT);
 
    struct scan_field chain7_fields[3];
 
    uint8_t n_rw;
    uint32_t data_out;
    uint8_t address_out;
    uint8_t ready;
    uint32_t data_in;
    uint8_t address_in;
 
    arm11_setup_field(arm11,  1, &n_rw,              &ready,          chain7_fields + 0);
    arm11_setup_field(arm11, 32, &data_out,          &data_in,        chain7_fields + 1);
    arm11_setup_field(arm11,  7, &address_out,       &address_in,     chain7_fields + 2);
 
    for (size_t i = 0; i < count + 1; i++) {
        if (i < count) {
            n_rw             = actions[i].write ? 1 : 0;
            data_out         = actions[i].value;
            address_out      = actions[i].address;
        } else {
            n_rw             = 1;
            data_out         = 0;
            address_out      = 0;
        }
 
        /* Timeout here so we don't get stuck. */
        int i_n = 0;
        while (1) {
            JTAG_DEBUG("SC7 <= c%-3d Data %08x %s",
                (unsigned) address_out,
                (unsigned) data_out,
                n_rw ? "write" : "read");
 
            arm11_add_dr_scan_vc(arm11->arm.target->tap, ARRAY_SIZE(chain7_fields),
                chain7_fields, TAP_DRPAUSE);
 
            CHECK_RETVAL(jtag_execute_queue());
 
            /* 'n_rw' is 'ready' on read out */
            if (ready)
                break;
 
            int64_t then = 0;
 
            if (i_n == 1000)
                then = timeval_ms();
            if (i_n >= 1000) {
                if ((timeval_ms()-then) > 1000) {
                    LOG_WARNING(
                        "Timeout (1000ms) waiting for instructions to complete");
                    return ERROR_FAIL;
                }
            }
 
            i_n++;
        }
 
        if (!n_rw)
            JTAG_DEBUG("SC7 => Data %08x", (unsigned) data_in);
 
        if (i > 0) {
            if (actions[i - 1].address != address_in)
                LOG_WARNING("Scan chain 7 shifted out unexpected address");
 
            if (!actions[i - 1].write)
                actions[i - 1].value = data_in;
            else {
                if (actions[i - 1].value != data_in)
                    LOG_WARNING("Scan chain 7 shifted out unexpected data");
            }
        }
    }
    return ERROR_OK;
}
 
int arm11_sc7_clear_vbw(struct arm11_common *arm11)
{
    size_t clear_bw_size = arm11->brp + 1;
    struct arm11_sc7_action *clear_bw = malloc(sizeof(struct arm11_sc7_action) * clear_bw_size);
    struct arm11_sc7_action *pos = clear_bw;
 
    for (size_t i = 0; i < clear_bw_size; i++) {
        clear_bw[i].write       = true;
        clear_bw[i].value       = 0;
    }
 
    for (size_t i = 0; i < arm11->brp; i++)
        (pos++)->address = ARM11_SC7_BCR0 + i;
 
    (pos++)->address = ARM11_SC7_VCR;
 
    int retval;
    retval = arm11_sc7_run(arm11, clear_bw, clear_bw_size);
 
    free(clear_bw);
 
    return retval;
}
 
int arm11_sc7_set_vcr(struct arm11_common *arm11, uint32_t value)
{
    struct arm11_sc7_action set_vcr;
 
    set_vcr.write           = true;
    set_vcr.address         = ARM11_SC7_VCR;
    set_vcr.value           = value;
 
    return arm11_sc7_run(arm11, &set_vcr, 1);
}
 
int arm11_read_memory_word(struct arm11_common *arm11, uint32_t address, uint32_t *result)
{
    int retval;
    retval = arm11_run_instr_data_prepare(arm11);
    if (retval != ERROR_OK)
        return retval;
 
    /* MRC p14,0,r0,c0,c5,0 (r0 = address) */
    CHECK_RETVAL(arm11_run_instr_data_to_core1(arm11, 0xee100e15, address));
 
    /* LDC p14,c5,[R0],#4 (DTR = [r0]) */
    CHECK_RETVAL(arm11_run_instr_data_from_core(arm11, 0xecb05e01, result, 1));
 
    return arm11_run_instr_data_finish(arm11);
}
 
/************************************************************************/
 
/*
 * ARM11 provider for the OpenOCD implementation of the standard
 * architectural ARM v6/v7 "Debug Programmer's Model" (DPM).
 */
 
static inline struct arm11_common *dpm_to_arm11(struct arm_dpm *dpm)
{
    return container_of(dpm, struct arm11_common, dpm);
}
 
static int arm11_dpm_prepare(struct arm_dpm *dpm)
{
    return arm11_run_instr_data_prepare(dpm_to_arm11(dpm));
}
 
static int arm11_dpm_finish(struct arm_dpm *dpm)
{
    return arm11_run_instr_data_finish(dpm_to_arm11(dpm));
}
 
static int arm11_dpm_instr_write_data_dcc(struct arm_dpm *dpm,
    uint32_t opcode, uint32_t data)
{
    return arm11_run_instr_data_to_core(dpm_to_arm11(dpm),
        opcode, &data, 1);
}
 
static int arm11_dpm_instr_write_data_r0(struct arm_dpm *dpm,
    uint32_t opcode, uint32_t data)
{
    return arm11_run_instr_data_to_core_via_r0(dpm_to_arm11(dpm),
        opcode, data);
}
 
static int arm11_dpm_instr_read_data_dcc(struct arm_dpm *dpm,
    uint32_t opcode, uint32_t *data)
{
    return arm11_run_instr_data_from_core(dpm_to_arm11(dpm),
        opcode, data, 1);
}
 
static int arm11_dpm_instr_read_data_r0(struct arm_dpm *dpm,
    uint32_t opcode, uint32_t *data)
{
    return arm11_run_instr_data_from_core_via_r0(dpm_to_arm11(dpm),
        opcode, data);
}
 
/* Because arm11_sc7_run() takes a vector of actions, we batch breakpoint
 * and watchpoint operations instead of running them right away.  Since we
 * pre-allocated our vector, we don't need to worry about space.
 */
static int arm11_bpwp_enable(struct arm_dpm *dpm, unsigned index_t,
    uint32_t addr, uint32_t control)
{
    struct arm11_common *arm11 = dpm_to_arm11(dpm);
    struct arm11_sc7_action *action;
 
    action = arm11->bpwp_actions + arm11->bpwp_n;
 
    /* Invariant:  this bp/wp is disabled.
     * It also happens that the core is halted here, but for
     * DPM-based cores we don't actually care about that.
     */
 
    action[0].write = action[1].write = true;
 
    action[0].value = addr;
    action[1].value = control;
 
    switch (index_t) {
        case 0 ... 15:
            action[0].address = ARM11_SC7_BVR0 + index_t;
            action[1].address = ARM11_SC7_BCR0 + index_t;
            break;
        case 16 ... 32:
            index_t -= 16;
            action[0].address = ARM11_SC7_WVR0 + index_t;
            action[1].address = ARM11_SC7_WCR0 + index_t;
            break;
        default:
            return ERROR_FAIL;
    }
 
    arm11->bpwp_n += 2;
 
    return ERROR_OK;
}
 
static int arm11_bpwp_disable(struct arm_dpm *dpm, unsigned index_t)
{
    struct arm11_common *arm11 = dpm_to_arm11(dpm);
    struct arm11_sc7_action *action;
 
    action = arm11->bpwp_actions + arm11->bpwp_n;
 
    action[0].write = true;
    action[0].value = 0;
 
    switch (index_t) {
        case 0 ... 15:
            action[0].address = ARM11_SC7_BCR0 + index_t;
            break;
        case 16 ... 32:
            index_t -= 16;
            action[0].address = ARM11_SC7_WCR0 + index_t;
            break;
        default:
            return ERROR_FAIL;
    }
 
    arm11->bpwp_n += 1;
 
    return ERROR_OK;
}
 
int arm11_bpwp_flush(struct arm11_common *arm11)
{
    int retval;
 
    if (!arm11->bpwp_n)
        return ERROR_OK;
 
    retval = arm11_sc7_run(arm11, arm11->bpwp_actions, arm11->bpwp_n);
    arm11->bpwp_n = 0;
 
    return retval;
}
 
int arm11_dpm_init(struct arm11_common *arm11, uint32_t didr)
{
    struct arm_dpm *dpm = &arm11->dpm;
    int retval;
 
    dpm->arm = &arm11->arm;
 
    dpm->didr = didr;
 
    dpm->prepare = arm11_dpm_prepare;
    dpm->finish = arm11_dpm_finish;
 
    dpm->instr_write_data_dcc = arm11_dpm_instr_write_data_dcc;
    dpm->instr_write_data_r0 = arm11_dpm_instr_write_data_r0;
 
    dpm->instr_read_data_dcc = arm11_dpm_instr_read_data_dcc;
    dpm->instr_read_data_r0 = arm11_dpm_instr_read_data_r0;
 
    dpm->bpwp_enable = arm11_bpwp_enable;
    dpm->bpwp_disable = arm11_bpwp_disable;
 
    retval = arm_dpm_setup(dpm);
    if (retval != ERROR_OK)
        return retval;
 
    /* alloc enough to enable all breakpoints and watchpoints at once */
    arm11->bpwp_actions = calloc(2 * (dpm->nbp + dpm->nwp),
            sizeof(*arm11->bpwp_actions));
    if (!arm11->bpwp_actions)
        return ERROR_FAIL;
 
    retval = arm_dpm_initialize(dpm);
    if (retval != ERROR_OK)
        return retval;
 
    return arm11_bpwp_flush(arm11);
}
 
void arm11_dpm_deinit(struct arm11_common *arm11)
{
    struct arm_dpm *dpm = &arm11->dpm;
 
    free(arm11->bpwp_actions);
    arm_free_reg_cache(dpm->arm);
    free(dpm->dbp);
    free(dpm->dwp);
}