smp.c

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// SPDX-License-Identifier: GPL-2.0-or-later
 
/***************************************************************************
 *                                                                         *
 * Copyright (C) ST-Ericsson SA 2011                                       *
 * Author: Michel Jaouen <michel.jaouen@stericsson.com> for ST-Ericsson.   *
 ***************************************************************************/
 
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
 
#include "server/server.h"
 
#include "target/target.h"
 
#include "server/gdb_server.h"
#include "smp.h"
#include "helper/binarybuffer.h"
 
/* DEPRECATED: gdb_read_smp_packet/gdb_write_smp_packet to be removed      */
/*  implementation of new packet in gdb interface for smp feature          */
/*                                                                         */
/*   j : smp  status request                                               */
/*   J : smp  set request                                                  */
/*                                                                         */
/*   jc :read core id displayed by gdb connection                          */
/*   reply XXXXXXXX core id is int32_t , 8 hex digits                      */
/*                                                                         */
/*   Reply ENN error not supported (target not smp)                        */
/*                                                                         */
/*   JcXX  set core id displayed at next gdb continue                      */
/*   maximum 8 bytes described core id int32_t (8 hex digits)              */
/*  (core id -1 , reserved for returning to normal continue mode) */
/*  Reply ENN error not supported(target not smp,core id out of range)     */
/*  Reply OK : for success                                                 */
/*                                                                         */
/*  handling of this packet within gdb can be done by the creation         */
/*  internal variable by mean of function allocate_computed_value          */
/*  set $_core 1 => Jc01 packet is sent                                    */
/*  print $_core => jc packet is sent and result is affected in $          */
/*  Another way to test this packet is the usage of maintenance packet     */
/*  maint packet Jc01                                                      */
/*  maint packet jc                                                        */
 
/* packet j :smp status request */
#define DEPRECATED_MSG "DEPRECATED: This method is deprecated in favor of the hwthread pseudo RTOS"
int gdb_read_smp_packet(struct connection *connection,
        char const *packet, int packet_size)
{
    struct target *target = get_target_from_connection(connection);
    int retval = ERROR_OK;
 
    LOG_WARNING(DEPRECATED_MSG);
 
    if (target->smp) {
        if (strncmp(packet, "jc", 2) == 0) {
            const uint32_t len = sizeof(target->gdb_service->core[0]);
            char hex_buffer[len * 2 + 1];
            uint8_t buffer[len];
            buf_set_u32(buffer, 0, len * 8, target->gdb_service->core[0]);
            size_t pkt_len = hexify(hex_buffer, buffer, sizeof(buffer),
                sizeof(hex_buffer));
 
            retval = gdb_put_packet(connection, hex_buffer, pkt_len);
        }
    } else
        retval = gdb_put_packet(connection, "E01", 3);
    return retval;
}
 
/* J :  smp set request */
int gdb_write_smp_packet(struct connection *connection,
        char const *packet, int packet_size)
{
    struct target *target = get_target_from_connection(connection);
    char *separator;
    int coreid = 0;
    int retval = ERROR_OK;
 
    LOG_WARNING(DEPRECATED_MSG);
 
    /* skip command character */
    if (target->smp) {
        if (strncmp(packet, "Jc", 2) == 0) {
            packet += 2;
            coreid = strtoul(packet, &separator, 16);
            target->gdb_service->core[1] = coreid;
            retval = gdb_put_packet(connection, "OK", 2);
        }
    } else
        retval = gdb_put_packet(connection, "E01", 3);
 
    return retval;
}
 
COMMAND_HANDLER(default_handle_smp_command)
{
    struct target *target = get_current_target(CMD_CTX);
    struct target_list *head;
 
    if (CMD_ARGC > 1)
        return ERROR_COMMAND_SYNTAX_ERROR;
 
    if (!CMD_ARGC) {
        command_print(CMD, "%s", target->smp ? "on" : "off");
        return ERROR_OK;
    }
 
    if (!strcmp(CMD_ARGV[0], "on")) {
        foreach_smp_target(head, target->smp_targets)
            head->target->smp = 1;
 
        return ERROR_OK;
    }
 
    if (!strcmp(CMD_ARGV[0], "off")) {
        foreach_smp_target(head, target->smp_targets)
            head->target->smp = 0;
 
        /* fixes the target display to the debugger */
        if (!list_empty(target->smp_targets) && target->gdb_service)
            target->gdb_service->target = target;
 
        return ERROR_OK;
    }
 
    return ERROR_COMMAND_SYNTAX_ERROR;
}
 
COMMAND_HANDLER(handle_smp_gdb_command)
{
    struct target *target = get_current_target(CMD_CTX);
    int retval = ERROR_OK;
 
    LOG_WARNING(DEPRECATED_MSG);
 
    if (!list_empty(target->smp_targets)) {
        if (CMD_ARGC == 1) {
            int coreid = 0;
            COMMAND_PARSE_NUMBER(int, CMD_ARGV[0], coreid);
            if (retval != ERROR_OK)
                return retval;
            target->gdb_service->core[1] = coreid;
 
        }
        command_print(CMD, "gdb coreid  %" PRId32 " -> %" PRId32, target->gdb_service->core[0]
            , target->gdb_service->core[1]);
    }
    return ERROR_OK;
}
 
const struct command_registration smp_command_handlers[] = {
    {
        .name = "smp",
        .handler = default_handle_smp_command,
        .mode = COMMAND_EXEC,
        .help = "smp handling",
        .usage = "[on|off]",
    },
    {
        .name = "smp_gdb",
        .handler = handle_smp_gdb_command,
        .mode = COMMAND_EXEC,
        .help = "display/fix current core played to gdb",
        .usage = "",
    },
    COMMAND_REGISTRATION_DONE
};