target_request.c

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// SPDX-License-Identifier: GPL-2.0-or-later
 
/***************************************************************************
 *   Copyright (C) 2007 by Dominic Rath                                    *
 *   Dominic.Rath@gmx.de                                                   *
 *                                                                         *
 *   Copyright (C) 2007,2008 Øyvind Harboe                                 *
 *   oyvind.harboe@zylin.com                                               *
 *                                                                         *
 *   Copyright (C) 2008 by Spencer Oliver                                  *
 *   spen@spen-soft.co.uk                                                  *
 ***************************************************************************/
 
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
 
#include <helper/log.h>
#include <helper/binarybuffer.h>
 
#include "target.h"
#include "target_request.h"
#include "target_type.h"
#include "trace.h"
 
static bool got_message;
 
bool target_got_message(void)
{
    bool t = got_message;
    got_message = false;
    return t;
}
 
static int charmsg_mode;
 
static int target_asciimsg(struct target *target, uint32_t length)
{
    char *msg = malloc(DIV_ROUND_UP(length + 1, 4) * 4);
    struct debug_msg_receiver *c = target->dbgmsg;
 
    target->type->target_request_data(target, DIV_ROUND_UP(length, 4), (uint8_t *)msg);
    msg[length] = 0;
 
    LOG_DEBUG("%s", msg);
 
    while (c) {
        command_output_text(c->cmd_ctx, msg);
        c = c->next;
    }
 
    return ERROR_OK;
}
 
static int target_charmsg(struct target *target, uint8_t msg)
{
    LOG_USER_N("%c", msg);
 
    return ERROR_OK;
}
 
static int target_hexmsg(struct target *target, int size, uint32_t length)
{
    uint8_t *data = malloc(DIV_ROUND_UP(length * size, 4) * 4);
    char line[128];
    int line_len;
    struct debug_msg_receiver *c = target->dbgmsg;
    uint32_t i;
 
    LOG_DEBUG("size: %i, length: %i", (int)size, (int)length);
 
    target->type->target_request_data(target, DIV_ROUND_UP(length * size, 4), (uint8_t *)data);
 
    line_len = 0;
    for (i = 0; i < length; i++) {
        switch (size) {
            case 4:
                line_len += snprintf(line + line_len, 128 - line_len, "%8.8" PRIx32 " ", le_to_h_u32(data + (4*i)));
                break;
            case 2:
                line_len += snprintf(line + line_len, 128 - line_len, "%4.4x ", le_to_h_u16(data + (2*i)));
                break;
            case 1:
                line_len += snprintf(line + line_len, 128 - line_len, "%2.2x ", data[i]);
                break;
        }
 
        if ((i%8 == 7) || (i == length - 1)) {
            LOG_DEBUG("%s", line);
 
            while (c) {
                command_output_text(c->cmd_ctx, line);
                c = c->next;
            }
            c = target->dbgmsg;
            line_len = 0;
        }
    }
 
    free(data);
 
    return ERROR_OK;
}
 
/* handle requests from the target received by a target specific
 * side-band channel (e.g. ARM7/9 DCC)
 */
int target_request(struct target *target, uint32_t request)
{
    target_req_cmd_t target_req_cmd = request & 0xff;
 
    assert(target->type->target_request_data);
 
    /* Record that we got a target message for back-off algorithm */
    got_message = true;
 
    if (charmsg_mode) {
        target_charmsg(target, target_req_cmd);
        return ERROR_OK;
    }
 
    switch (target_req_cmd) {
        case TARGET_REQ_TRACEMSG:
            trace_point(target, (request & 0xffffff00) >> 8);
            break;
        case TARGET_REQ_DEBUGMSG:
            if (((request & 0xff00) >> 8) == 0)
                target_asciimsg(target, (request & 0xffff0000) >> 16);
            else
                target_hexmsg(target, (request & 0xff00) >> 8, (request & 0xffff0000) >> 16);
            break;
        case TARGET_REQ_DEBUGCHAR:
            target_charmsg(target, (request & 0x00ff0000) >> 16);
            break;
/*      case TARGET_REQ_SEMIHOSTING:
 *          break;
 */
        default:
            LOG_ERROR("unknown target request: %2.2x", target_req_cmd);
            break;
    }
 
    return ERROR_OK;
}
 
static int add_debug_msg_receiver(struct command_context *cmd_ctx, struct target *target)
{
    struct debug_msg_receiver **p = &target->dbgmsg;
 
    if (!target)
        return ERROR_COMMAND_SYNTAX_ERROR;
 
    /* see if there's already a list */
    if (*p) {
        /* find end of linked list */
        while ((*p)->next)
            p = &((*p)->next);
        p = &((*p)->next);
    }
 
    /* add new debug message receiver */
    (*p) = malloc(sizeof(struct debug_msg_receiver));
    (*p)->cmd_ctx = cmd_ctx;
    (*p)->next = NULL;
 
    /* enable callback */
    target->dbg_msg_enabled = 1;
 
    return ERROR_OK;
}
 
static struct debug_msg_receiver *find_debug_msg_receiver(struct command_context *cmd_ctx,
        struct target *target)
{
    int do_all_targets = 0;
 
    /* if no target has been specified search all of them */
    if (!target) {
        /* if no targets haven been specified */
        if (!all_targets)
            return NULL;
 
        target = all_targets;
        do_all_targets = 1;
    }
 
    /* so we target != null */
    struct debug_msg_receiver **p = &target->dbgmsg;
    do {
        while (*p) {
            if ((*p)->cmd_ctx == cmd_ctx)
                return *p;
            p = &((*p)->next);
        }
 
        target = target->next;
    } while (target && do_all_targets);
 
    return NULL;
}
 
int delete_debug_msg_receiver(struct command_context *cmd_ctx, struct target *target)
{
    struct debug_msg_receiver **p;
    struct debug_msg_receiver *c;
    int do_all_targets = 0;
 
    /* if no target has been specified search all of them */
    if (!target) {
        /* if no targets haven been specified */
        if (!all_targets)
            return ERROR_OK;
 
        target = all_targets;
        do_all_targets = 1;
    }
 
    do {
        p = &target->dbgmsg;
        c = *p;
        while (c) {
            struct debug_msg_receiver *next = c->next;
            if (c->cmd_ctx == cmd_ctx) {
                *p = next;
                free(c);
                if (!*p) {
                    /* disable callback */
                    target->dbg_msg_enabled = 0;
                }
                return ERROR_OK;
            } else
                p = &(c->next);
            c = next;
        }
 
        target = target->next;
    } while (target && do_all_targets);
 
    return ERROR_OK;
}
 
COMMAND_HANDLER(handle_target_request_debugmsgs_command)
{
    struct target *target = get_current_target(CMD_CTX);
 
    int receiving = 0;
 
    if (!target->type->target_request_data) {
        LOG_ERROR("Target %s does not support target requests", target_name(target));
        return ERROR_OK;
    }
 
    /* see if receiver is already registered */
    if (find_debug_msg_receiver(CMD_CTX, target))
        receiving = 1;
 
    if (CMD_ARGC > 0) {
        if (!strcmp(CMD_ARGV[0], "enable") || !strcmp(CMD_ARGV[0], "charmsg")) {
            /* don't register if this command context is already receiving */
            if (!receiving) {
                receiving = 1;
                add_debug_msg_receiver(CMD_CTX, target);
            }
            charmsg_mode = !strcmp(CMD_ARGV[0], "charmsg");
        } else if (!strcmp(CMD_ARGV[0], "disable")) {
            /* no need to delete a receiver if none is registered */
            if (receiving) {
                receiving = 0;
                delete_debug_msg_receiver(CMD_CTX, target);
            }
        } else
            return ERROR_COMMAND_SYNTAX_ERROR;
    }
 
    command_print(CMD, "receiving debug messages from current target %s",
            (receiving) ? (charmsg_mode ? "charmsg" : "enabled") : "disabled");
    return ERROR_OK;
}
 
static const struct command_registration target_req_exec_command_handlers[] = {
    {
        .name = "debugmsgs",
        .handler = handle_target_request_debugmsgs_command,
        .mode = COMMAND_EXEC,
        .help = "display and/or modify reception of debug messages from target",
        .usage = "['enable'|'charmsg'|'disable']",
    },
    COMMAND_REGISTRATION_DONE
};
static const struct command_registration target_req_command_handlers[] = {
    {
        .name = "target_request",
        .mode = COMMAND_ANY,
        .help = "target request command group",
        .usage = "",
        .chain = target_req_exec_command_handlers,
    },
    COMMAND_REGISTRATION_DONE
};
 
int target_request_register_commands(struct command_context *cmd_ctx)
{
    return register_commands(cmd_ctx, NULL, target_req_command_handlers);
}