src/target/smp.c

   1 /***************************************************************************
   2  *                                                                         *
   3  * Copyright (C) ST-Ericsson SA 2011                                       *
   4  * Author: Michel Jaouen <michel.jaouen@stericsson.com> for ST-Ericsson.   *
   5  *   This program is free software; you can redistribute it and/or modify  *
   6  *   it under the terms of the GNU General Public License as published by  *
   7  *   the Free Software Foundation; either version 2 of the License, or     *
   8  *   (at your option) any later version.                                   *
   9  *                                                                         *
  10  *   This program is distributed in the hope that it will be useful,       *
  11  *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
  12  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
  13  *   GNU General Public License for more details.                          *
  14  *                                                                         *
  15  *   You should have received a copy of the GNU General Public License     *
  16  *   along with this program.  If not, see <http://www.gnu.org/licenses/>. *
  17  ***************************************************************************/
  18
  19 #ifdef HAVE_CONFIG_H
  20 #include "config.h"
  21 #endif
  22
  23 #include "server/server.h"
  24
  25 #include "target/target.h"
  26
  27 #include "server/gdb_server.h"
  28 #include "smp.h"
  29 #include "helper/binarybuffer.h"
  30
  31 /*  implementation of new packet in gdb interface for smp feature          */
  32 /*                                                                         */
  33 /*   j : smp  status request                                               */
  34 /*   J : smp  set request                                                  */
  35 /*                                                                         */
  36 /*   jc :read core id displayed by gdb connection                          */
  37 /*   reply XXXXXXXX core id is int32_t , 8 hex digits                      */
  38 /*                                                                         */
  39 /*   Reply ENN error not supported (target not smp)                        */
  40 /*                                                                         */
  41 /*   JcXX  set core id displayed at next gdb continue                      */
  42 /*   maximum 8 bytes described core id int32_t (8 hex digits)              */
  43 /*  (core id -1 , reserved for returning to normal continue mode) */
  44 /*  Reply ENN error not supported(target not smp,core id out of range)     */
  45 /*  Reply OK : for success                                                 */
  46 /*                                                                         */
  47 /*  handling of this packet within gdb can be done by the creation         */
  48 /*  internal variable by mean of function allocate_computed_value          */
  49 /*  set $_core 1 => Jc01 packet is sent                                    */
  50 /*  print $_core => jc packet is sent and result is affected in $          */
  51 /*  Another way to test this packet is the usage of maintenance packet     */
  52 /*  maint packet Jc01                                                      */
  53 /*  maint packet jc                                                        */
  54
  55 /* packet j :smp status request */
  56 int gdb_read_smp_packet(struct connection *connection,
  57                 char const *packet, int packet_size)
  58 {
  59         struct target *target = get_target_from_connection(connection);
  60         int retval = ERROR_OK;
  61         if (target->smp) {
  62                 if (strncmp(packet, "jc", 2) == 0) {
  63                         const uint32_t len = sizeof(target->gdb_service->core[0]);
  64                         char hex_buffer[len * 2 + 1];
  65                         uint8_t buffer[len];
  66                         buf_set_u32(buffer, 0, len * 8, target->gdb_service->core[0]);
  67                         size_t pkt_len = hexify(hex_buffer, buffer, sizeof(buffer),
  68                                 sizeof(hex_buffer));
  69
  70                         retval = gdb_put_packet(connection, hex_buffer, pkt_len);
  71                 }
  72         } else
  73                 retval = gdb_put_packet(connection, "E01", 3);
  74         return retval;
  75 }
  76
  77 /* J :  smp set request */
  78 int gdb_write_smp_packet(struct connection *connection,
  79                 char const *packet, int packet_size)
  80 {
  81         struct target *target = get_target_from_connection(connection);
  82         char *separator;
  83         int coreid = 0;
  84         int retval = ERROR_OK;
  85
  86         /* skip command character */
  87         if (target->smp) {
  88                 if (strncmp(packet, "Jc", 2) == 0) {
  89                         packet += 2;
  90                         coreid = strtoul(packet, &separator, 16);
  91                         target->gdb_service->core[1] = coreid;
  92                         retval = gdb_put_packet(connection, "OK", 2);
  93                 }
  94         } else
  95                 retval = gdb_put_packet(connection, "E01", 3);
  96
  97         return retval;
  98 }
  99
 100 COMMAND_HANDLER(default_handle_smp_command)
 101 {
 102         struct target *target = get_current_target(CMD_CTX);
 103         struct target_list *head;
 104
 105         if (CMD_ARGC > 1)
 106                 return ERROR_COMMAND_SYNTAX_ERROR;
 107
 108         if (!CMD_ARGC) {
 109                 command_print(CMD, "%s", target->smp ? "on" : "off");
 110                 return ERROR_OK;
 111         }
 112
 113         if (!strcmp(CMD_ARGV[0], "on")) {
 114                 foreach_smp_target(head, target->head)
 115                         head->target->smp = 1;
 116
 117                 return ERROR_OK;
 118         }
 119
 120         if (!strcmp(CMD_ARGV[0], "off")) {
 121                 foreach_smp_target(head, target->head)
 122                         head->target->smp = 0;
 123
 124                 /* fixes the target display to the debugger */
 125                 if (target->head)
 126                         target->gdb_service->target = target;
 127
 128                 return ERROR_OK;
 129         }
 130
 131         return ERROR_COMMAND_SYNTAX_ERROR;
 132 }
 133
 134 COMMAND_HANDLER(handle_smp_gdb_command)
 135 {
 136         struct target *target = get_current_target(CMD_CTX);
 137         int retval = ERROR_OK;
 138         struct target_list *head;
 139         head = target->head;
 140         if (head) {
 141                 if (CMD_ARGC == 1) {
 142                         int coreid = 0;
 143                         COMMAND_PARSE_NUMBER(int, CMD_ARGV[0], coreid);
 144                         if (retval != ERROR_OK)
 145                                 return retval;
 146                         target->gdb_service->core[1] = coreid;
 147
 148                 }
 149                 command_print(CMD, "gdb coreid  %" PRId32 " -> %" PRId32, target->gdb_service->core[0]
 150                         , target->gdb_service->core[1]);
 151         }
 152         return ERROR_OK;
 153 }
 154
 155 const struct command_registration smp_command_handlers[] = {
 156         {
 157                 .name = "smp",
 158                 .handler = default_handle_smp_command,
 159                 .mode = COMMAND_EXEC,
 160                 .help = "smp handling",
 161                 .usage = "[on|off]",
 162         },
 163         {
 164                 .name = "smp_gdb",
 165                 .handler = handle_smp_gdb_command,
 166                 .mode = COMMAND_EXEC,
 167                 .help = "display/fix current core played to gdb",
 168                 .usage = "",
 169         },
 170         COMMAND_REGISTRATION_DONE
 171 };