svf.c

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// SPDX-License-Identifier: GPL-2.0-or-later
 
/***************************************************************************
 *    Copyright (C) 2009 by Simon Qian                                     *
 *    SimonQian@SimonQian.com                                              *
 ***************************************************************************/
 
/* The specification for SVF is available here:
 * http://www.asset-intertech.com/support/svf.pdf
 * Below, this document is referred to as the "SVF spec".
 *
 * The specification for XSVF is available here:
 * http://www.xilinx.com/support/documentation/application_notes/xapp503.pdf
 * Below, this document is referred to as the "XSVF spec".
 */
 
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
 
#include <jtag/jtag.h>
#include "svf.h"
#include "helper/system.h"
#include <helper/time_support.h>
 
/* SVF command */
enum svf_command {
    ENDDR,
    ENDIR,
    FREQUENCY,
    HDR,
    HIR,
    PIO,
    PIOMAP,
    RUNTEST,
    SDR,
    SIR,
    STATE,
    TDR,
    TIR,
    TRST,
};
 
static const char *svf_command_name[14] = {
    "ENDDR",
    "ENDIR",
    "FREQUENCY",
    "HDR",
    "HIR",
    "PIO",
    "PIOMAP",
    "RUNTEST",
    "SDR",
    "SIR",
    "STATE",
    "TDR",
    "TIR",
    "TRST"
};
 
enum trst_mode {
    TRST_ON,
    TRST_OFF,
    TRST_Z,
    TRST_ABSENT
};
 
static const char *svf_trst_mode_name[4] = {
    "ON",
    "OFF",
    "Z",
    "ABSENT"
};
 
struct svf_statemove {
    tap_state_t from;
    tap_state_t to;
    uint32_t num_of_moves;
    tap_state_t paths[8];
};
 
/*
 * These paths are from the SVF specification for the STATE command, to be
 * used when the STATE command only includes the final state.  The first
 * element of the path is the "from" (current) state, and the last one is
 * the "to" (target) state.
 *
 * All specified paths are the shortest ones in the JTAG spec, and are thus
 * not (!!) exact matches for the paths used elsewhere in OpenOCD.  Note
 * that PAUSE-to-PAUSE transitions all go through UPDATE and then CAPTURE,
 * which has specific effects on the various registers; they are not NOPs.
 *
 * Paths to RESET are disabled here.  As elsewhere in OpenOCD, and in XSVF
 * and many SVF implementations, we don't want to risk missing that state.
 * To get to RESET, always we ignore the current state.
 */
static const struct svf_statemove svf_statemoves[] = {
    /* from         to              num_of_moves,   paths[8] */
/*  {TAP_RESET,     TAP_RESET,      1,              {TAP_RESET}}, */
    {TAP_RESET,     TAP_IDLE,       2,              {TAP_RESET, TAP_IDLE} },
    {TAP_RESET,     TAP_DRPAUSE,    6,              {TAP_RESET, TAP_IDLE, TAP_DRSELECT,
                                                        TAP_DRCAPTURE, TAP_DREXIT1, TAP_DRPAUSE} },
    {TAP_RESET,     TAP_IRPAUSE,    7,              {TAP_RESET, TAP_IDLE, TAP_DRSELECT,
                                                        TAP_IRSELECT, TAP_IRCAPTURE,
                                                        TAP_IREXIT1, TAP_IRPAUSE} },
 
/*  {TAP_IDLE,      TAP_RESET,      4,              {TAP_IDLE,
 * TAP_DRSELECT, TAP_IRSELECT, TAP_RESET}}, */
    {TAP_IDLE,      TAP_IDLE,       1,              {TAP_IDLE} },
    {TAP_IDLE,      TAP_DRPAUSE,    5,              {TAP_IDLE, TAP_DRSELECT, TAP_DRCAPTURE,
                                                        TAP_DREXIT1, TAP_DRPAUSE} },
    {TAP_IDLE,      TAP_IRPAUSE,    6,              {TAP_IDLE, TAP_DRSELECT, TAP_IRSELECT,
                                                        TAP_IRCAPTURE, TAP_IREXIT1, TAP_IRPAUSE} },
 
/*  {TAP_DRPAUSE,   TAP_RESET,      6,              {TAP_DRPAUSE,
 * TAP_DREXIT2, TAP_DRUPDATE, TAP_DRSELECT, TAP_IRSELECT, TAP_RESET}}, */
    {TAP_DRPAUSE,   TAP_IDLE,       4,              {TAP_DRPAUSE, TAP_DREXIT2, TAP_DRUPDATE,
                                                        TAP_IDLE} },
    {TAP_DRPAUSE,   TAP_DRPAUSE,    7,              {TAP_DRPAUSE, TAP_DREXIT2, TAP_DRUPDATE,
                                                        TAP_DRSELECT, TAP_DRCAPTURE,
                                                        TAP_DREXIT1, TAP_DRPAUSE} },
    {TAP_DRPAUSE,   TAP_IRPAUSE,    8,              {TAP_DRPAUSE, TAP_DREXIT2, TAP_DRUPDATE,
                                                        TAP_DRSELECT, TAP_IRSELECT,
                                                        TAP_IRCAPTURE, TAP_IREXIT1, TAP_IRPAUSE} },
 
/*  {TAP_IRPAUSE,   TAP_RESET,      6,              {TAP_IRPAUSE,
 * TAP_IREXIT2, TAP_IRUPDATE, TAP_DRSELECT, TAP_IRSELECT, TAP_RESET}}, */
    {TAP_IRPAUSE,   TAP_IDLE,       4,              {TAP_IRPAUSE, TAP_IREXIT2, TAP_IRUPDATE,
                                                        TAP_IDLE} },
    {TAP_IRPAUSE,   TAP_DRPAUSE,    7,              {TAP_IRPAUSE, TAP_IREXIT2, TAP_IRUPDATE,
                                                        TAP_DRSELECT, TAP_DRCAPTURE,
                                                        TAP_DREXIT1, TAP_DRPAUSE} },
    {TAP_IRPAUSE,   TAP_IRPAUSE,    8,              {TAP_IRPAUSE, TAP_IREXIT2, TAP_IRUPDATE,
                                                        TAP_DRSELECT, TAP_IRSELECT,
                                                        TAP_IRCAPTURE, TAP_IREXIT1, TAP_IRPAUSE} }
};
 
#define XXR_TDI             (1 << 0)
#define XXR_TDO             (1 << 1)
#define XXR_MASK            (1 << 2)
#define XXR_SMASK           (1 << 3)
struct svf_xxr_para {
    int len;
    int data_mask;
    uint8_t *tdi;
    uint8_t *tdo;
    uint8_t *mask;
    uint8_t *smask;
};
 
struct svf_para {
    float frequency;
    tap_state_t ir_end_state;
    tap_state_t dr_end_state;
    tap_state_t runtest_run_state;
    tap_state_t runtest_end_state;
    enum trst_mode trst_mode;
 
    struct svf_xxr_para hir_para;
    struct svf_xxr_para hdr_para;
    struct svf_xxr_para tir_para;
    struct svf_xxr_para tdr_para;
    struct svf_xxr_para sir_para;
    struct svf_xxr_para sdr_para;
};
 
static struct svf_para svf_para;
static const struct svf_para svf_para_init = {
/*  frequency, ir_end_state, dr_end_state, runtest_run_state, runtest_end_state, trst_mode */
    0,          TAP_IDLE,       TAP_IDLE,   TAP_IDLE,       TAP_IDLE,       TRST_Z,
/*  hir_para */
/*  {len,   data_mask,  tdi,    tdo,    mask,   smask}, */
    {0,         0,      NULL,   NULL,   NULL,   NULL},
/*  hdr_para */
/*  {len,   data_mask,  tdi,    tdo,    mask,   smask}, */
    {0,         0,      NULL,   NULL,   NULL,   NULL},
/*  tir_para */
/*  {len,   data_mask,  tdi,    tdo,    mask,   smask}, */
    {0,         0,      NULL,   NULL,   NULL,   NULL},
/*  tdr_para */
/*  {len,   data_mask,  tdi,    tdo,    mask,   smask}, */
    {0,         0,      NULL,   NULL,   NULL,   NULL},
/*  sir_para */
/*  {len,   data_mask,  tdi,    tdo,    mask,   smask}, */
    {0,         0,      NULL,   NULL,   NULL,   NULL},
/*  sdr_para */
/*  {len,   data_mask,  tdi,    tdo,    mask,   smask}, */
    {0,         0,      NULL,   NULL,   NULL,   NULL},
};
 
struct svf_check_tdo_para {
    int line_num;       /* used to record line number of the check operation */
    /* so more information could be printed */
    int enabled;        /* check is enabled or not */
    int buffer_offset;  /* buffer_offset to buffers */
    int bit_len;        /* bit length to check */
};
 
#define SVF_CHECK_TDO_PARA_SIZE 1024
static struct svf_check_tdo_para *svf_check_tdo_para;
static int svf_check_tdo_para_index;
 
static int svf_read_command_from_file(FILE *fd);
static int svf_check_tdo(void);
static int svf_add_check_para(uint8_t enabled, int buffer_offset, int bit_len);
static int svf_run_command(struct command_context *cmd_ctx, char *cmd_str);
static int svf_execute_tap(void);
 
static FILE *svf_fd;
static char *svf_read_line;
static size_t svf_read_line_size;
static char *svf_command_buffer;
static size_t svf_command_buffer_size;
static int svf_line_number;
static int svf_getline(char **lineptr, size_t *n, FILE *stream);
 
#define SVF_MAX_BUFFER_SIZE_TO_COMMIT   (1024 * 1024)
static uint8_t *svf_tdi_buffer, *svf_tdo_buffer, *svf_mask_buffer;
static int svf_buffer_index, svf_buffer_size;
static int svf_quiet;
static int svf_nil;
static int svf_ignore_error;
 
/* Targeting particular tap */
static int svf_tap_is_specified;
static int svf_set_padding(struct svf_xxr_para *para, int len, unsigned char tdi);
 
/* Progress Indicator */
static int svf_progress_enabled;
static long svf_total_lines;
static int svf_percentage;
static int svf_last_printed_percentage = -1;
 
/*
 * macro is used to print the svf hex buffer at desired debug level
 * DEBUG, INFO, ERROR, USER
 */
#define SVF_BUF_LOG(_lvl, _buf, _nbits, _desc)                          \
    svf_hexbuf_print(LOG_LVL_##_lvl,  __FILE__, __LINE__, __func__, _buf, _nbits, _desc)
 
static void svf_hexbuf_print(int dbg_lvl, const char *file, unsigned line,
                             const char *function, const uint8_t *buf,
                             int bit_len, const char *desc)
{
    int j, len = 0;
    int byte_len = DIV_ROUND_UP(bit_len, 8);
    int msbits = bit_len % 8;
 
    /* allocate 2 bytes per hex digit */
    char *prbuf = malloc((byte_len * 2) + 2 + 1);
    if (!prbuf)
        return;
 
    /* print correct number of bytes, mask excess bits where applicable */
    uint8_t msb = buf[byte_len - 1] & (msbits ? (1 << msbits) - 1 : 0xff);
    len = sprintf(prbuf, msbits <= 4 ? "0x%01"PRIx8 : "0x%02"PRIx8, msb);
    for (j = byte_len - 2; j >= 0; j--)
        len += sprintf(prbuf + len, "%02"PRIx8, buf[j]);
 
    log_printf_lf(dbg_lvl, file, line, function, "%8s = %s", desc ? desc : " ", prbuf);
 
    free(prbuf);
}
 
static int svf_realloc_buffers(size_t len)
{
    void *ptr;
 
    if (svf_execute_tap() != ERROR_OK)
        return ERROR_FAIL;
 
    ptr = realloc(svf_tdi_buffer, len);
    if (!ptr)
        return ERROR_FAIL;
    svf_tdi_buffer = ptr;
 
    ptr = realloc(svf_tdo_buffer, len);
    if (!ptr)
        return ERROR_FAIL;
    svf_tdo_buffer = ptr;
 
    ptr = realloc(svf_mask_buffer, len);
    if (!ptr)
        return ERROR_FAIL;
    svf_mask_buffer = ptr;
 
    svf_buffer_size = len;
 
    return ERROR_OK;
}
 
static void svf_free_xxd_para(struct svf_xxr_para *para)
{
    if (para) {
        free(para->tdi);
        para->tdi = NULL;
 
        free(para->tdo);
        para->tdo = NULL;
 
        free(para->mask);
        para->mask = NULL;
 
        free(para->smask);
        para->smask = NULL;
    }
}
 
int svf_add_statemove(tap_state_t state_to)
{
    tap_state_t state_from = cmd_queue_cur_state;
    unsigned index_var;
 
    /* when resetting, be paranoid and ignore current state */
    if (state_to == TAP_RESET) {
        if (svf_nil)
            return ERROR_OK;
 
        jtag_add_tlr();
        return ERROR_OK;
    }
 
    for (index_var = 0; index_var < ARRAY_SIZE(svf_statemoves); index_var++) {
        if ((svf_statemoves[index_var].from == state_from)
                && (svf_statemoves[index_var].to == state_to)) {
            if (svf_nil)
                continue;
                        /* recorded path includes current state ... avoid
                         *extra TCKs! */
            if (svf_statemoves[index_var].num_of_moves > 1)
                jtag_add_pathmove(svf_statemoves[index_var].num_of_moves - 1,
                    svf_statemoves[index_var].paths + 1);
            else
                jtag_add_pathmove(svf_statemoves[index_var].num_of_moves,
                    svf_statemoves[index_var].paths);
            return ERROR_OK;
        }
    }
    LOG_ERROR("SVF: can not move to %s", tap_state_name(state_to));
    return ERROR_FAIL;
}
 
COMMAND_HANDLER(handle_svf_command)
{
#define SVF_MIN_NUM_OF_OPTIONS 1
#define SVF_MAX_NUM_OF_OPTIONS 5
    int command_num = 0;
    int ret = ERROR_OK;
    int64_t time_measure_ms;
    int time_measure_s, time_measure_m;
 
    /* use NULL to indicate a "plain" svf file which accounts for
     * any additional devices in the scan chain, otherwise the device
     * that should be affected
    */
    struct jtag_tap *tap = NULL;
 
    if ((CMD_ARGC < SVF_MIN_NUM_OF_OPTIONS) || (CMD_ARGC > SVF_MAX_NUM_OF_OPTIONS))
        return ERROR_COMMAND_SYNTAX_ERROR;
 
    /* parse command line */
    svf_quiet = 0;
    svf_nil = 0;
    svf_progress_enabled = 0;
    svf_ignore_error = 0;
    for (unsigned int i = 0; i < CMD_ARGC; i++) {
        if (strcmp(CMD_ARGV[i], "-tap") == 0) {
            tap = jtag_tap_by_string(CMD_ARGV[i+1]);
            if (!tap) {
                command_print(CMD, "Tap: %s unknown", CMD_ARGV[i+1]);
                return ERROR_FAIL;
            }
            i++;
        } else if ((strcmp(CMD_ARGV[i],
                "quiet") == 0) || (strcmp(CMD_ARGV[i], "-quiet") == 0))
            svf_quiet = 1;
        else if ((strcmp(CMD_ARGV[i], "nil") == 0) || (strcmp(CMD_ARGV[i], "-nil") == 0))
            svf_nil = 1;
        else if ((strcmp(CMD_ARGV[i],
                  "progress") == 0) || (strcmp(CMD_ARGV[i], "-progress") == 0))
            svf_progress_enabled = 1;
        else if ((strcmp(CMD_ARGV[i],
                  "ignore_error") == 0) || (strcmp(CMD_ARGV[i], "-ignore_error") == 0))
            svf_ignore_error = 1;
        else {
            svf_fd = fopen(CMD_ARGV[i], "r");
            if (!svf_fd) {
                int err = errno;
                command_print(CMD, "open(\"%s\"): %s", CMD_ARGV[i], strerror(err));
                /* no need to free anything now */
                return ERROR_COMMAND_SYNTAX_ERROR;
            } else
                LOG_USER("svf processing file: \"%s\"", CMD_ARGV[i]);
        }
    }
 
    if (!svf_fd)
        return ERROR_COMMAND_SYNTAX_ERROR;
 
    /* get time */
    time_measure_ms = timeval_ms();
 
    /* init */
    svf_line_number = 0;
    svf_command_buffer_size = 0;
 
    svf_check_tdo_para_index = 0;
    svf_check_tdo_para = malloc(sizeof(struct svf_check_tdo_para) * SVF_CHECK_TDO_PARA_SIZE);
    if (!svf_check_tdo_para) {
        LOG_ERROR("not enough memory");
        ret = ERROR_FAIL;
        goto free_all;
    }
 
    svf_buffer_index = 0;
    /* double the buffer size */
    /* in case current command cannot be committed, and next command is a bit scan command */
    /* here is 32K bits for this big scan command, it should be enough */
    /* buffer will be reallocated if buffer size is not enough */
    if (svf_realloc_buffers(2 * SVF_MAX_BUFFER_SIZE_TO_COMMIT) != ERROR_OK) {
        ret = ERROR_FAIL;
        goto free_all;
    }
 
    memcpy(&svf_para, &svf_para_init, sizeof(svf_para));
 
    if (!svf_nil) {
        /* TAP_RESET */
        jtag_add_tlr();
    }
 
    if (tap) {
        /* Tap is specified, set header/trailer paddings */
        int header_ir_len = 0, header_dr_len = 0, trailer_ir_len = 0, trailer_dr_len = 0;
        struct jtag_tap *check_tap;
 
        svf_tap_is_specified = 1;
 
        for (check_tap = jtag_all_taps(); check_tap; check_tap = check_tap->next_tap) {
            if (check_tap->abs_chain_position < tap->abs_chain_position) {
                /* Header */
                header_ir_len += check_tap->ir_length;
                header_dr_len++;
            } else if (check_tap->abs_chain_position > tap->abs_chain_position) {
                /* Trailer */
                trailer_ir_len += check_tap->ir_length;
                trailer_dr_len++;
            }
        }
 
        /* HDR %d TDI (0) */
        if (svf_set_padding(&svf_para.hdr_para, header_dr_len, 0) != ERROR_OK) {
            LOG_ERROR("failed to set data header");
            return ERROR_FAIL;
        }
 
        /* HIR %d TDI (0xFF) */
        if (svf_set_padding(&svf_para.hir_para, header_ir_len, 0xFF) != ERROR_OK) {
            LOG_ERROR("failed to set instruction header");
            return ERROR_FAIL;
        }
 
        /* TDR %d TDI (0) */
        if (svf_set_padding(&svf_para.tdr_para, trailer_dr_len, 0) != ERROR_OK) {
            LOG_ERROR("failed to set data trailer");
            return ERROR_FAIL;
        }
 
        /* TIR %d TDI (0xFF) */
        if (svf_set_padding(&svf_para.tir_para, trailer_ir_len, 0xFF) != ERROR_OK) {
            LOG_ERROR("failed to set instruction trailer");
            return ERROR_FAIL;
        }
    }
 
    if (svf_progress_enabled) {
        /* Count total lines in file. */
        while (!feof(svf_fd)) {
            svf_getline(&svf_command_buffer, &svf_command_buffer_size, svf_fd);
            svf_total_lines++;
        }
        rewind(svf_fd);
    }
    while (svf_read_command_from_file(svf_fd) == ERROR_OK) {
        /* Log Output */
        if (svf_quiet) {
            if (svf_progress_enabled) {
                svf_percentage = ((svf_line_number * 20) / svf_total_lines) * 5;
                if (svf_last_printed_percentage != svf_percentage) {
                    LOG_USER_N("\r%d%%    ", svf_percentage);
                    svf_last_printed_percentage = svf_percentage;
                }
            }
        } else {
            if (svf_progress_enabled) {
                svf_percentage = ((svf_line_number * 20) / svf_total_lines) * 5;
                LOG_USER_N("%3d%%  %s", svf_percentage, svf_read_line);
            } else
                LOG_USER_N("%s", svf_read_line);
        }
        /* Run Command */
        if (svf_run_command(CMD_CTX, svf_command_buffer) != ERROR_OK) {
            LOG_ERROR("fail to run command at line %d", svf_line_number);
            ret = ERROR_FAIL;
            break;
        }
        command_num++;
    }
 
    if ((!svf_nil) && (jtag_execute_queue() != ERROR_OK))
        ret = ERROR_FAIL;
    else if (svf_check_tdo() != ERROR_OK)
        ret = ERROR_FAIL;
 
    /* print time */
    time_measure_ms = timeval_ms() - time_measure_ms;
    time_measure_s = time_measure_ms / 1000;
    time_measure_ms %= 1000;
    time_measure_m = time_measure_s / 60;
    time_measure_s %= 60;
    if (time_measure_ms < 1000)
        command_print(CMD,
            "\r\nTime used: %dm%ds%" PRId64 "ms ",
            time_measure_m,
            time_measure_s,
            time_measure_ms);
 
free_all:
 
    fclose(svf_fd);
    svf_fd = 0;
 
    /* free buffers */
    free(svf_command_buffer);
    svf_command_buffer = NULL;
    svf_command_buffer_size = 0;
 
    free(svf_check_tdo_para);
    svf_check_tdo_para = NULL;
    svf_check_tdo_para_index = 0;
 
    free(svf_tdi_buffer);
    svf_tdi_buffer = NULL;
 
    free(svf_tdo_buffer);
    svf_tdo_buffer = NULL;
 
    free(svf_mask_buffer);
    svf_mask_buffer = NULL;
 
    svf_buffer_index = 0;
    svf_buffer_size = 0;
 
    svf_free_xxd_para(&svf_para.hdr_para);
    svf_free_xxd_para(&svf_para.hir_para);
    svf_free_xxd_para(&svf_para.tdr_para);
    svf_free_xxd_para(&svf_para.tir_para);
    svf_free_xxd_para(&svf_para.sdr_para);
    svf_free_xxd_para(&svf_para.sir_para);
 
    if (ret == ERROR_OK)
        command_print(CMD,
                  "svf file programmed %s for %d commands with %d errors",
                  (svf_ignore_error > 1) ? "unsuccessfully" : "successfully",
                  command_num,
                  (svf_ignore_error > 1) ? (svf_ignore_error - 1) : 0);
    else
        command_print(CMD, "svf file programmed failed");
 
    svf_ignore_error = 0;
    return ret;
}
 
static int svf_getline(char **lineptr, size_t *n, FILE *stream)
{
#define MIN_CHUNK 16    /* Buffer is increased by this size each time as required */
    size_t i = 0;
 
    if (!*lineptr) {
        *n = MIN_CHUNK;
        *lineptr = malloc(*n);
        if (!*lineptr)
            return -1;
    }
 
    (*lineptr)[0] = fgetc(stream);
    while ((*lineptr)[i] != '\n') {
        (*lineptr)[++i] = fgetc(stream);
        if (feof(stream)) {
            (*lineptr)[0] = 0;
            return -1;
        }
        if ((i + 2) > *n) {
            *n += MIN_CHUNK;
            *lineptr = realloc(*lineptr, *n);
        }
    }
 
    (*lineptr)[++i] = 0;
 
    return sizeof(*lineptr);
}
 
#define SVFP_CMD_INC_CNT 1024
static int svf_read_command_from_file(FILE *fd)
{
    unsigned char ch;
    int i = 0;
    size_t cmd_pos = 0;
    int cmd_ok = 0, slash = 0;
 
    if (svf_getline(&svf_read_line, &svf_read_line_size, svf_fd) <= 0)
        return ERROR_FAIL;
    svf_line_number++;
    ch = svf_read_line[0];
    while (!cmd_ok && (ch != 0)) {
        switch (ch) {
            case '!':
                slash = 0;
                if (svf_getline(&svf_read_line, &svf_read_line_size, svf_fd) <= 0)
                    return ERROR_FAIL;
                svf_line_number++;
                i = -1;
                break;
            case '/':
                if (++slash == 2) {
                    slash = 0;
                    if (svf_getline(&svf_read_line, &svf_read_line_size,
                        svf_fd) <= 0)
                        return ERROR_FAIL;
                    svf_line_number++;
                    i = -1;
                }
                break;
            case ';':
                slash = 0;
                cmd_ok = 1;
                break;
            case '\n':
                svf_line_number++;
                if (svf_getline(&svf_read_line, &svf_read_line_size, svf_fd) <= 0)
                    return ERROR_FAIL;
                i = -1;
                /* fallthrough */
            case '\r':
                slash = 0;
                /* Don't save '\r' and '\n' if no data is parsed */
                if (!cmd_pos)
                    break;
                /* fallthrough */
            default:
                /* The parsing code currently expects a space
                 * before parentheses -- "TDI (123)".  Also a
                 * space afterwards -- "TDI (123) TDO(456)".
                 * But such spaces are optional... instead of
                 * parser updates, cope with that by adding the
                 * spaces as needed.
                 *
                 * Ensure there are 3 bytes available, for:
                 *  - current character
                 *  - added space.
                 *  - terminating NUL ('\0')
                 */
                if (cmd_pos + 3 > svf_command_buffer_size) {
                    svf_command_buffer = realloc(svf_command_buffer, cmd_pos + 3);
                    svf_command_buffer_size = cmd_pos + 3;
                    if (!svf_command_buffer) {
                        LOG_ERROR("not enough memory");
                        return ERROR_FAIL;
                    }
                }
 
                /* insert a space before '(' */
                if ('(' == ch)
                    svf_command_buffer[cmd_pos++] = ' ';
 
                svf_command_buffer[cmd_pos++] = (char)toupper(ch);
 
                /* insert a space after ')' */
                if (')' == ch)
                    svf_command_buffer[cmd_pos++] = ' ';
                break;
        }
        ch = svf_read_line[++i];
    }
 
    if (cmd_ok) {
        svf_command_buffer[cmd_pos] = '\0';
        return ERROR_OK;
    } else
        return ERROR_FAIL;
}
 
static int svf_parse_cmd_string(char *str, int len, char **argus, int *num_of_argu)
{
    int pos = 0, num = 0, space_found = 1, in_bracket = 0;
 
    while (pos < len) {
        switch (str[pos]) {
            case '!':
            case '/':
                LOG_ERROR("fail to parse svf command");
                return ERROR_FAIL;
            case '(':
                in_bracket = 1;
                goto parse_char;
            case ')':
                in_bracket = 0;
                goto parse_char;
            default:
parse_char:
                if (!in_bracket && isspace((int) str[pos])) {
                    space_found = 1;
                    str[pos] = '\0';
                } else if (space_found) {
                    argus[num++] = &str[pos];
                    space_found = 0;
                }
                break;
        }
        pos++;
    }
 
    if (num == 0)
        return ERROR_FAIL;
 
    *num_of_argu = num;
 
    return ERROR_OK;
}
 
bool svf_tap_state_is_stable(tap_state_t state)
{
    return (state == TAP_RESET) || (state == TAP_IDLE)
            || (state == TAP_DRPAUSE) || (state == TAP_IRPAUSE);
}
 
static int svf_find_string_in_array(char *str, char **strs, int num_of_element)
{
    int i;
 
    for (i = 0; i < num_of_element; i++) {
        if (!strcmp(str, strs[i]))
            return i;
    }
    return 0xFF;
}
 
static int svf_adjust_array_length(uint8_t **arr, int orig_bit_len, int new_bit_len)
{
    int new_byte_len = (new_bit_len + 7) >> 3;
 
    if ((!*arr) || (((orig_bit_len + 7) >> 3) < ((new_bit_len + 7) >> 3))) {
        free(*arr);
        *arr = calloc(1, new_byte_len);
        if (!*arr) {
            LOG_ERROR("not enough memory");
            return ERROR_FAIL;
        }
    }
    return ERROR_OK;
}
 
static int svf_set_padding(struct svf_xxr_para *para, int len, unsigned char tdi)
{
    int error = ERROR_OK;
    error |= svf_adjust_array_length(&para->tdi, para->len, len);
    memset(para->tdi, tdi, (len + 7) >> 3);
    error |= svf_adjust_array_length(&para->tdo, para->len, len);
    error |= svf_adjust_array_length(&para->mask, para->len, len);
    para->len = len;
    para->data_mask = XXR_TDI;
 
    return error;
}
 
static int svf_copy_hexstring_to_binary(char *str, uint8_t **bin, int orig_bit_len, int bit_len)
{
    int i, str_len = strlen(str), str_hbyte_len = (bit_len + 3) >> 2;
    uint8_t ch = 0;
 
    if (svf_adjust_array_length(bin, orig_bit_len, bit_len) != ERROR_OK) {
        LOG_ERROR("fail to adjust length of array");
        return ERROR_FAIL;
    }
 
    /* fill from LSB (end of str) to MSB (beginning of str) */
    for (i = 0; i < str_hbyte_len; i++) {
        ch = 0;
        while (str_len > 0) {
            ch = str[--str_len];
 
            /* Skip whitespace.  The SVF specification (rev E) is
             * deficient in terms of basic lexical issues like
             * where whitespace is allowed.  Long bitstrings may
             * require line ends for correctness, since there is
             * a hard limit on line length.
             */
            if (!isspace(ch)) {
                if ((ch >= '0') && (ch <= '9')) {
                    ch = ch - '0';
                    break;
                } else if ((ch >= 'A') && (ch <= 'F')) {
                    ch = ch - 'A' + 10;
                    break;
                } else {
                    LOG_ERROR("invalid hex string");
                    return ERROR_FAIL;
                }
            }
 
            ch = 0;
        }
 
        /* write bin */
        if (i % 2) {
            /* MSB */
            (*bin)[i / 2] |= ch << 4;
        } else {
            /* LSB */
            (*bin)[i / 2] = 0;
            (*bin)[i / 2] |= ch;
        }
    }
 
    /* consume optional leading '0' MSBs or whitespace */
    while (str_len > 0 && ((str[str_len - 1] == '0')
            || isspace((int) str[str_len - 1])))
        str_len--;
 
    /* check validity: we must have consumed everything */
    if (str_len > 0 || (ch & ~((2 << ((bit_len - 1) % 4)) - 1)) != 0) {
        LOG_ERROR("value exceeds length");
        return ERROR_FAIL;
    }
 
    return ERROR_OK;
}
 
static int svf_check_tdo(void)
{
    int i, len, index_var;
 
    for (i = 0; i < svf_check_tdo_para_index; i++) {
        index_var = svf_check_tdo_para[i].buffer_offset;
        len = svf_check_tdo_para[i].bit_len;
        if ((svf_check_tdo_para[i].enabled)
                && buf_cmp_mask(&svf_tdi_buffer[index_var], &svf_tdo_buffer[index_var],
                &svf_mask_buffer[index_var], len)) {
            LOG_ERROR("tdo check error at line %d",
                svf_check_tdo_para[i].line_num);
            SVF_BUF_LOG(ERROR, &svf_tdi_buffer[index_var], len, "READ");
            SVF_BUF_LOG(ERROR, &svf_tdo_buffer[index_var], len, "WANT");
            SVF_BUF_LOG(ERROR, &svf_mask_buffer[index_var], len, "MASK");
 
            if (svf_ignore_error == 0)
                return ERROR_FAIL;
            else
                svf_ignore_error++;
        }
    }
    svf_check_tdo_para_index = 0;
 
    return ERROR_OK;
}
 
static int svf_add_check_para(uint8_t enabled, int buffer_offset, int bit_len)
{
    if (svf_check_tdo_para_index >= SVF_CHECK_TDO_PARA_SIZE) {
        LOG_ERROR("toooooo many operation undone");
        return ERROR_FAIL;
    }
 
    svf_check_tdo_para[svf_check_tdo_para_index].line_num = svf_line_number;
    svf_check_tdo_para[svf_check_tdo_para_index].bit_len = bit_len;
    svf_check_tdo_para[svf_check_tdo_para_index].enabled = enabled;
    svf_check_tdo_para[svf_check_tdo_para_index].buffer_offset = buffer_offset;
    svf_check_tdo_para_index++;
 
    return ERROR_OK;
}
 
static int svf_execute_tap(void)
{
    if ((!svf_nil) && (jtag_execute_queue() != ERROR_OK))
        return ERROR_FAIL;
    else if (svf_check_tdo() != ERROR_OK)
        return ERROR_FAIL;
 
    svf_buffer_index = 0;
 
    return ERROR_OK;
}
 
static int svf_run_command(struct command_context *cmd_ctx, char *cmd_str)
{
    char *argus[256], command;
    int num_of_argu = 0, i;
 
    /* tmp variable */
    int i_tmp;
 
    /* for RUNTEST */
    int run_count;
    float min_time;
    /* for XXR */
    struct svf_xxr_para *xxr_para_tmp;
    uint8_t **pbuffer_tmp;
    struct scan_field field;
    /* for STATE */
    tap_state_t *path = NULL, state;
    /* flag padding commands skipped due to -tap command */
    int padding_command_skipped = 0;
 
    if (svf_parse_cmd_string(cmd_str, strlen(cmd_str), argus, &num_of_argu) != ERROR_OK)
        return ERROR_FAIL;
 
    /* NOTE: we're a bit loose here, because we ignore case in
     * TAP state names (instead of insisting on uppercase).
     */
 
    command = svf_find_string_in_array(argus[0],
            (char **)svf_command_name, ARRAY_SIZE(svf_command_name));
    switch (command) {
        case ENDDR:
        case ENDIR:
            if (num_of_argu != 2) {
                LOG_ERROR("invalid parameter of %s", argus[0]);
                return ERROR_FAIL;
            }
 
            i_tmp = tap_state_by_name(argus[1]);
 
            if (svf_tap_state_is_stable(i_tmp)) {
                if (command == ENDIR) {
                    svf_para.ir_end_state = i_tmp;
                    LOG_DEBUG("\tIR end_state = %s",
                            tap_state_name(i_tmp));
                } else {
                    svf_para.dr_end_state = i_tmp;
                    LOG_DEBUG("\tDR end_state = %s",
                            tap_state_name(i_tmp));
                }
            } else {
                LOG_ERROR("%s: %s is not a stable state",
                        argus[0], argus[1]);
                return ERROR_FAIL;
            }
            break;
        case FREQUENCY:
            if ((num_of_argu != 1) && (num_of_argu != 3)) {
                LOG_ERROR("invalid parameter of %s", argus[0]);
                return ERROR_FAIL;
            }
            if (num_of_argu == 1) {
                /* TODO: set jtag speed to full speed */
                svf_para.frequency = 0;
            } else {
                if (strcmp(argus[2], "HZ")) {
                    LOG_ERROR("HZ not found in FREQUENCY command");
                    return ERROR_FAIL;
                }
                if (svf_execute_tap() != ERROR_OK)
                    return ERROR_FAIL;
                svf_para.frequency = atof(argus[1]);
                /* TODO: set jtag speed to */
                if (svf_para.frequency > 0) {
                    command_run_linef(cmd_ctx,
                            "adapter speed %d",
                            (int)svf_para.frequency / 1000);
                    LOG_DEBUG("\tfrequency = %f", svf_para.frequency);
                }
            }
            break;
        case HDR:
            if (svf_tap_is_specified) {
                padding_command_skipped = 1;
                break;
            }
            xxr_para_tmp = &svf_para.hdr_para;
            goto xxr_common;
        case HIR:
            if (svf_tap_is_specified) {
                padding_command_skipped = 1;
                break;
            }
            xxr_para_tmp = &svf_para.hir_para;
            goto xxr_common;
        case TDR:
            if (svf_tap_is_specified) {
                padding_command_skipped = 1;
                break;
            }
            xxr_para_tmp = &svf_para.tdr_para;
            goto xxr_common;
        case TIR:
            if (svf_tap_is_specified) {
                padding_command_skipped = 1;
                break;
            }
            xxr_para_tmp = &svf_para.tir_para;
            goto xxr_common;
        case SDR:
            xxr_para_tmp = &svf_para.sdr_para;
            goto xxr_common;
        case SIR:
            xxr_para_tmp = &svf_para.sir_para;
            goto xxr_common;
xxr_common:
            /* XXR length [TDI (tdi)] [TDO (tdo)][MASK (mask)] [SMASK (smask)] */
            if ((num_of_argu > 10) || (num_of_argu % 2)) {
                LOG_ERROR("invalid parameter of %s", argus[0]);
                return ERROR_FAIL;
            }
            i_tmp = xxr_para_tmp->len;
            xxr_para_tmp->len = atoi(argus[1]);
            /* If we are to enlarge the buffers, all parts of xxr_para_tmp
             * need to be freed */
            if (i_tmp < xxr_para_tmp->len) {
                free(xxr_para_tmp->tdi);
                xxr_para_tmp->tdi = NULL;
                free(xxr_para_tmp->tdo);
                xxr_para_tmp->tdo = NULL;
                free(xxr_para_tmp->mask);
                xxr_para_tmp->mask = NULL;
                free(xxr_para_tmp->smask);
                xxr_para_tmp->smask = NULL;
            }
 
            LOG_DEBUG("\tlength = %d", xxr_para_tmp->len);
            xxr_para_tmp->data_mask = 0;
            for (i = 2; i < num_of_argu; i += 2) {
                if ((strlen(argus[i + 1]) < 3) || (argus[i + 1][0] != '(') ||
                (argus[i + 1][strlen(argus[i + 1]) - 1] != ')')) {
                    LOG_ERROR("data section error");
                    return ERROR_FAIL;
                }
                argus[i + 1][strlen(argus[i + 1]) - 1] = '\0';
                /* TDI, TDO, MASK, SMASK */
                if (!strcmp(argus[i], "TDI")) {
                    /* TDI */
                    pbuffer_tmp = &xxr_para_tmp->tdi;
                    xxr_para_tmp->data_mask |= XXR_TDI;
                } else if (!strcmp(argus[i], "TDO")) {
                    /* TDO */
                    pbuffer_tmp = &xxr_para_tmp->tdo;
                    xxr_para_tmp->data_mask |= XXR_TDO;
                } else if (!strcmp(argus[i], "MASK")) {
                    /* MASK */
                    pbuffer_tmp = &xxr_para_tmp->mask;
                    xxr_para_tmp->data_mask |= XXR_MASK;
                } else if (!strcmp(argus[i], "SMASK")) {
                    /* SMASK */
                    pbuffer_tmp = &xxr_para_tmp->smask;
                    xxr_para_tmp->data_mask |= XXR_SMASK;
                } else {
                    LOG_ERROR("unknown parameter: %s", argus[i]);
                    return ERROR_FAIL;
                }
                if (ERROR_OK !=
                svf_copy_hexstring_to_binary(&argus[i + 1][1], pbuffer_tmp, i_tmp,
                    xxr_para_tmp->len)) {
                    LOG_ERROR("fail to parse hex value");
                    return ERROR_FAIL;
                }
                SVF_BUF_LOG(DEBUG, *pbuffer_tmp, xxr_para_tmp->len, argus[i]);
            }
            /* If a command changes the length of the last scan of the same type and the
             * MASK parameter is absent, */
            /* the mask pattern used is all cares */
            if (!(xxr_para_tmp->data_mask & XXR_MASK) && (i_tmp != xxr_para_tmp->len)) {
                /* MASK not defined and length changed */
                if (ERROR_OK !=
                svf_adjust_array_length(&xxr_para_tmp->mask, i_tmp,
                    xxr_para_tmp->len)) {
                    LOG_ERROR("fail to adjust length of array");
                    return ERROR_FAIL;
                }
                buf_set_ones(xxr_para_tmp->mask, xxr_para_tmp->len);
            }
            /* If TDO is absent, no comparison is needed, set the mask to 0 */
            if (!(xxr_para_tmp->data_mask & XXR_TDO)) {
                if (!xxr_para_tmp->tdo) {
                    if (ERROR_OK !=
                    svf_adjust_array_length(&xxr_para_tmp->tdo, i_tmp,
                        xxr_para_tmp->len)) {
                        LOG_ERROR("fail to adjust length of array");
                        return ERROR_FAIL;
                    }
                }
                if (!xxr_para_tmp->mask) {
                    if (ERROR_OK !=
                    svf_adjust_array_length(&xxr_para_tmp->mask, i_tmp,
                        xxr_para_tmp->len)) {
                        LOG_ERROR("fail to adjust length of array");
                        return ERROR_FAIL;
                    }
                }
                memset(xxr_para_tmp->mask, 0, (xxr_para_tmp->len + 7) >> 3);
            }
            /* do scan if necessary */
            if (command == SDR) {
                /* check buffer size first, reallocate if necessary */
                i = svf_para.hdr_para.len + svf_para.sdr_para.len +
                        svf_para.tdr_para.len;
                if ((svf_buffer_size - svf_buffer_index) < ((i + 7) >> 3)) {
                    /* reallocate buffer */
                    if (svf_realloc_buffers(svf_buffer_index + ((i + 7) >> 3)) != ERROR_OK) {
                        LOG_ERROR("not enough memory");
                        return ERROR_FAIL;
                    }
                }
 
                /* assemble dr data */
                i = 0;
                buf_set_buf(svf_para.hdr_para.tdi,
                        0,
                        &svf_tdi_buffer[svf_buffer_index],
                        i,
                        svf_para.hdr_para.len);
                i += svf_para.hdr_para.len;
                buf_set_buf(svf_para.sdr_para.tdi,
                        0,
                        &svf_tdi_buffer[svf_buffer_index],
                        i,
                        svf_para.sdr_para.len);
                i += svf_para.sdr_para.len;
                buf_set_buf(svf_para.tdr_para.tdi,
                        0,
                        &svf_tdi_buffer[svf_buffer_index],
                        i,
                        svf_para.tdr_para.len);
                i += svf_para.tdr_para.len;
 
                /* add check data */
                if (svf_para.sdr_para.data_mask & XXR_TDO) {
                    /* assemble dr mask data */
                    i = 0;
                    buf_set_buf(svf_para.hdr_para.mask,
                            0,
                            &svf_mask_buffer[svf_buffer_index],
                            i,
                            svf_para.hdr_para.len);
                    i += svf_para.hdr_para.len;
                    buf_set_buf(svf_para.sdr_para.mask,
                            0,
                            &svf_mask_buffer[svf_buffer_index],
                            i,
                            svf_para.sdr_para.len);
                    i += svf_para.sdr_para.len;
                    buf_set_buf(svf_para.tdr_para.mask,
                            0,
                            &svf_mask_buffer[svf_buffer_index],
                            i,
                            svf_para.tdr_para.len);
 
                    /* assemble dr check data */
                    i = 0;
                    buf_set_buf(svf_para.hdr_para.tdo,
                            0,
                            &svf_tdo_buffer[svf_buffer_index],
                            i,
                            svf_para.hdr_para.len);
                    i += svf_para.hdr_para.len;
                    buf_set_buf(svf_para.sdr_para.tdo,
                            0,
                            &svf_tdo_buffer[svf_buffer_index],
                            i,
                            svf_para.sdr_para.len);
                    i += svf_para.sdr_para.len;
                    buf_set_buf(svf_para.tdr_para.tdo,
                            0,
                            &svf_tdo_buffer[svf_buffer_index],
                            i,
                            svf_para.tdr_para.len);
                    i += svf_para.tdr_para.len;
 
                    svf_add_check_para(1, svf_buffer_index, i);
                } else
                    svf_add_check_para(0, svf_buffer_index, i);
                field.num_bits = i;
                field.out_value = &svf_tdi_buffer[svf_buffer_index];
                field.in_value = (xxr_para_tmp->data_mask & XXR_TDO) ? &svf_tdi_buffer[svf_buffer_index] : NULL;
                if (!svf_nil) {
                    /* NOTE:  doesn't use SVF-specified state paths */
                    jtag_add_plain_dr_scan(field.num_bits,
                            field.out_value,
                            field.in_value,
                            svf_para.dr_end_state);
                }
 
                svf_buffer_index += (i + 7) >> 3;
            } else if (command == SIR) {
                /* check buffer size first, reallocate if necessary */
                i = svf_para.hir_para.len + svf_para.sir_para.len +
                        svf_para.tir_para.len;
                if ((svf_buffer_size - svf_buffer_index) < ((i + 7) >> 3)) {
                    if (svf_realloc_buffers(svf_buffer_index + ((i + 7) >> 3)) != ERROR_OK) {
                        LOG_ERROR("not enough memory");
                        return ERROR_FAIL;
                    }
                }
 
                /* assemble ir data */
                i = 0;
                buf_set_buf(svf_para.hir_para.tdi,
                        0,
                        &svf_tdi_buffer[svf_buffer_index],
                        i,
                        svf_para.hir_para.len);
                i += svf_para.hir_para.len;
                buf_set_buf(svf_para.sir_para.tdi,
                        0,
                        &svf_tdi_buffer[svf_buffer_index],
                        i,
                        svf_para.sir_para.len);
                i += svf_para.sir_para.len;
                buf_set_buf(svf_para.tir_para.tdi,
                        0,
                        &svf_tdi_buffer[svf_buffer_index],
                        i,
                        svf_para.tir_para.len);
                i += svf_para.tir_para.len;
 
                /* add check data */
                if (svf_para.sir_para.data_mask & XXR_TDO) {
                    /* assemble dr mask data */
                    i = 0;
                    buf_set_buf(svf_para.hir_para.mask,
                            0,
                            &svf_mask_buffer[svf_buffer_index],
                            i,
                            svf_para.hir_para.len);
                    i += svf_para.hir_para.len;
                    buf_set_buf(svf_para.sir_para.mask,
                            0,
                            &svf_mask_buffer[svf_buffer_index],
                            i,
                            svf_para.sir_para.len);
                    i += svf_para.sir_para.len;
                    buf_set_buf(svf_para.tir_para.mask,
                            0,
                            &svf_mask_buffer[svf_buffer_index],
                            i,
                            svf_para.tir_para.len);
 
                    /* assemble dr check data */
                    i = 0;
                    buf_set_buf(svf_para.hir_para.tdo,
                            0,
                            &svf_tdo_buffer[svf_buffer_index],
                            i,
                            svf_para.hir_para.len);
                    i += svf_para.hir_para.len;
                    buf_set_buf(svf_para.sir_para.tdo,
                            0,
                            &svf_tdo_buffer[svf_buffer_index],
                            i,
                            svf_para.sir_para.len);
                    i += svf_para.sir_para.len;
                    buf_set_buf(svf_para.tir_para.tdo,
                            0,
                            &svf_tdo_buffer[svf_buffer_index],
                            i,
                            svf_para.tir_para.len);
                    i += svf_para.tir_para.len;
 
                    svf_add_check_para(1, svf_buffer_index, i);
                } else
                    svf_add_check_para(0, svf_buffer_index, i);
                field.num_bits = i;
                field.out_value = &svf_tdi_buffer[svf_buffer_index];
                field.in_value = (xxr_para_tmp->data_mask & XXR_TDO) ? &svf_tdi_buffer[svf_buffer_index] : NULL;
                if (!svf_nil) {
                    /* NOTE:  doesn't use SVF-specified state paths */
                    jtag_add_plain_ir_scan(field.num_bits,
                            field.out_value,
                            field.in_value,
                            svf_para.ir_end_state);
                }
 
                svf_buffer_index += (i + 7) >> 3;
            }
            break;
        case PIO:
        case PIOMAP:
            LOG_ERROR("PIO and PIOMAP are not supported");
            return ERROR_FAIL;
        case RUNTEST:
            /* RUNTEST [run_state] run_count run_clk [min_time SEC [MAXIMUM max_time
             * SEC]] [ENDSTATE end_state] */
            /* RUNTEST [run_state] min_time SEC [MAXIMUM max_time SEC] [ENDSTATE
             * end_state] */
            if ((num_of_argu < 3) || (num_of_argu > 11)) {
                LOG_ERROR("invalid parameter of %s", argus[0]);
                return ERROR_FAIL;
            }
            /* init */
            run_count = 0;
            min_time = 0;
            i = 1;
 
            /* run_state */
            i_tmp = tap_state_by_name(argus[i]);
            if (i_tmp != TAP_INVALID) {
                if (svf_tap_state_is_stable(i_tmp)) {
                    svf_para.runtest_run_state = i_tmp;
 
                    /* When a run_state is specified, the new
                     * run_state becomes the default end_state.
                     */
                    svf_para.runtest_end_state = i_tmp;
                    LOG_DEBUG("\trun_state = %s", tap_state_name(i_tmp));
                    i++;
                } else {
                    LOG_ERROR("%s: %s is not a stable state", argus[0], tap_state_name(i_tmp));
                    return ERROR_FAIL;
                }
            }
 
            /* run_count run_clk */
            if (((i + 2) <= num_of_argu) && strcmp(argus[i + 1], "SEC")) {
                if (!strcmp(argus[i + 1], "TCK")) {
                    /* clock source is TCK */
                    run_count = atoi(argus[i]);
                    LOG_DEBUG("\trun_count@TCK = %d", run_count);
                } else {
                    LOG_ERROR("%s not supported for clock", argus[i + 1]);
                    return ERROR_FAIL;
                }
                i += 2;
            }
            /* min_time SEC */
            if (((i + 2) <= num_of_argu) && !strcmp(argus[i + 1], "SEC")) {
                min_time = atof(argus[i]);
                LOG_DEBUG("\tmin_time = %fs", min_time);
                i += 2;
            }
            /* MAXIMUM max_time SEC */
            if (((i + 3) <= num_of_argu) &&
            !strcmp(argus[i], "MAXIMUM") && !strcmp(argus[i + 2], "SEC")) {
                float max_time = 0;
                max_time = atof(argus[i + 1]);
                LOG_DEBUG("\tmax_time = %fs", max_time);
                i += 3;
            }
            /* ENDSTATE end_state */
            if (((i + 2) <= num_of_argu) && !strcmp(argus[i], "ENDSTATE")) {
                i_tmp = tap_state_by_name(argus[i + 1]);
 
                if (svf_tap_state_is_stable(i_tmp)) {
                    svf_para.runtest_end_state = i_tmp;
                    LOG_DEBUG("\tend_state = %s", tap_state_name(i_tmp));
                } else {
                    LOG_ERROR("%s: %s is not a stable state", argus[0], tap_state_name(i_tmp));
                    return ERROR_FAIL;
                }
                i += 2;
            }
 
            /* all parameter should be parsed */
            if (i == num_of_argu) {
#if 1
                /* FIXME handle statemove failures */
                uint32_t min_usec = 1000000 * min_time;
 
                /* enter into run_state if necessary */
                if (cmd_queue_cur_state != svf_para.runtest_run_state)
                    svf_add_statemove(svf_para.runtest_run_state);
 
                /* add clocks and/or min wait */
                if (run_count > 0) {
                    if (!svf_nil)
                        jtag_add_clocks(run_count);
                }
 
                if (min_usec > 0) {
                    if (!svf_nil)
                        jtag_add_sleep(min_usec);
                }
 
                /* move to end_state if necessary */
                if (svf_para.runtest_end_state != svf_para.runtest_run_state)
                    svf_add_statemove(svf_para.runtest_end_state);
 
#else
                if (svf_para.runtest_run_state != TAP_IDLE) {
                    LOG_ERROR("cannot runtest in %s state",
                            tap_state_name(svf_para.runtest_run_state));
                    return ERROR_FAIL;
                }
 
                if (!svf_nil)
                    jtag_add_runtest(run_count, svf_para.runtest_end_state);
#endif
            } else {
                LOG_ERROR("fail to parse parameter of RUNTEST, %d out of %d is parsed",
                        i,
                        num_of_argu);
                return ERROR_FAIL;
            }
            break;
        case STATE:
            /* STATE [pathstate1 [pathstate2 ...[pathstaten]]] stable_state */
            if (num_of_argu < 2) {
                LOG_ERROR("invalid parameter of %s", argus[0]);
                return ERROR_FAIL;
            }
            if (num_of_argu > 2) {
                /* STATE pathstate1 ... stable_state */
                path = malloc((num_of_argu - 1) * sizeof(tap_state_t));
                if (!path) {
                    LOG_ERROR("not enough memory");
                    return ERROR_FAIL;
                }
                num_of_argu--;  /* num of path */
                i_tmp = 1;      /* path is from parameter 1 */
                for (i = 0; i < num_of_argu; i++, i_tmp++) {
                    path[i] = tap_state_by_name(argus[i_tmp]);
                    if (path[i] == TAP_INVALID) {
                        LOG_ERROR("%s: %s is not a valid state", argus[0], argus[i_tmp]);
                        free(path);
                        return ERROR_FAIL;
                    }
                    /* OpenOCD refuses paths containing TAP_RESET */
                    if (path[i] == TAP_RESET) {
                        /* FIXME last state MUST be stable! */
                        if (i > 0) {
                            if (!svf_nil)
                                jtag_add_pathmove(i, path);
                        }
                        if (!svf_nil)
                            jtag_add_tlr();
                        num_of_argu -= i + 1;
                        i = -1;
                    }
                }
                if (num_of_argu > 0) {
                    /* execute last path if necessary */
                    if (svf_tap_state_is_stable(path[num_of_argu - 1])) {
                        /* last state MUST be stable state */
                        if (!svf_nil)
                            jtag_add_pathmove(num_of_argu, path);
                        LOG_DEBUG("\tmove to %s by path_move",
                                tap_state_name(path[num_of_argu - 1]));
                    } else {
                        LOG_ERROR("%s: %s is not a stable state",
                                argus[0],
                                tap_state_name(path[num_of_argu - 1]));
                        free(path);
                        return ERROR_FAIL;
                    }
                }
 
                free(path);
                path = NULL;
            } else {
                /* STATE stable_state */
                state = tap_state_by_name(argus[1]);
                if (svf_tap_state_is_stable(state)) {
                    LOG_DEBUG("\tmove to %s by svf_add_statemove",
                            tap_state_name(state));
                    /* FIXME handle statemove failures */
                    svf_add_statemove(state);
                } else {
                    LOG_ERROR("%s: %s is not a stable state",
                            argus[0], tap_state_name(state));
                    return ERROR_FAIL;
                }
            }
            break;
        case TRST:
            /* TRST trst_mode */
            if (num_of_argu != 2) {
                LOG_ERROR("invalid parameter of %s", argus[0]);
                return ERROR_FAIL;
            }
            if (svf_para.trst_mode != TRST_ABSENT) {
                if (svf_execute_tap() != ERROR_OK)
                    return ERROR_FAIL;
                i_tmp = svf_find_string_in_array(argus[1],
                        (char **)svf_trst_mode_name,
                        ARRAY_SIZE(svf_trst_mode_name));
                switch (i_tmp) {
                case TRST_ON:
                    if (!svf_nil)
                        jtag_add_reset(1, 0);
                    break;
                case TRST_Z:
                case TRST_OFF:
                    if (!svf_nil)
                        jtag_add_reset(0, 0);
                    break;
                case TRST_ABSENT:
                    break;
                default:
                    LOG_ERROR("unknown TRST mode: %s", argus[1]);
                    return ERROR_FAIL;
                }
                svf_para.trst_mode = i_tmp;
                LOG_DEBUG("\ttrst_mode = %s", svf_trst_mode_name[svf_para.trst_mode]);
            } else {
                LOG_ERROR("can not accept TRST command if trst_mode is ABSENT");
                return ERROR_FAIL;
            }
            break;
        default:
            LOG_ERROR("invalid svf command: %s", argus[0]);
            return ERROR_FAIL;
    }
 
    if (!svf_quiet) {
        if (padding_command_skipped)
            LOG_USER("(Above Padding command skipped, as per -tap argument)");
    }
 
    if (debug_level >= LOG_LVL_DEBUG) {
        /* for convenient debugging, execute tap if possible */
        if ((svf_buffer_index > 0) &&
                (((command != STATE) && (command != RUNTEST)) ||
                        ((command == STATE) && (num_of_argu == 2)))) {
            if (svf_execute_tap() != ERROR_OK)
                return ERROR_FAIL;
 
            /* output debug info */
            if ((command == SIR) || (command == SDR))
                SVF_BUF_LOG(DEBUG, svf_tdi_buffer, svf_check_tdo_para[0].bit_len, "TDO read");
        }
    } else {
        /* for fast executing, execute tap if necessary */
        /* half of the buffer is for the next command */
        if (((svf_buffer_index >= SVF_MAX_BUFFER_SIZE_TO_COMMIT) ||
                (svf_check_tdo_para_index >= SVF_CHECK_TDO_PARA_SIZE / 2)) &&
                (((command != STATE) && (command != RUNTEST)) ||
                        ((command == STATE) && (num_of_argu == 2))))
            return svf_execute_tap();
    }
 
    return ERROR_OK;
}
 
static const struct command_registration svf_command_handlers[] = {
    {
        .name = "svf",
        .handler = handle_svf_command,
        .mode = COMMAND_EXEC,
        .help = "Runs a SVF file.",
        .usage = "[-tap device.tap] <file> [quiet] [nil] [progress] [ignore_error]",
    },
    COMMAND_REGISTRATION_DONE
};
 
int svf_register_commands(struct command_context *cmd_ctx)
{
    return register_commands(cmd_ctx, NULL, svf_command_handlers);
}