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, write to the                         *
  17  *   Free Software Foundation, Inc.,                                       *
  18  *   59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.             *
  19  ***************************************************************************/
  20
  21 #ifdef HAVE_CONFIG_H
  22 #include "config.h"
  23 #endif
  24
  25 #include "server/server.h"
  26
  27 #include "target/target.h"
  28
  29 #include "server/gdb_server.h"
  30 #include "smp.h"
  31
  32 /*  implementation of new packet in gdb interface for smp feature          */
  33 /*                                                                         */
  34 /*   j : smp  status request                                               */
  35 /*   J : smp  set request                                                  */
  36 /*                                                                         */
  37 /*   jc :read core id displayed by gdb connection                          */
  38 /*   reply XXXXXXXX core id is int32_t , 8 hex digits                      */
  39 /*                                                                         */
  40 /*   Reply ENN error not supported (target not smp)                        */
  41 /*                                                                         */
  42 /*   JcXX  set core id displayed at next gdb continue                      */
  43 /*   maximum 8 bytes described core id int32_t (8 hex digits)              */
  44 /*  (core id -1 , reserved for returning to normal continue mode) */
  45 /*  Reply ENN error not supported(target not smp,core id out of range)     */
  46 /*  Reply OK : for success                                                 */
  47 /*                                                                         */
  48 /*  handling of this packet within gdb can be done by the creation         */
  49 /*  internal variable by mean of function allocate_computed_value          */
  50 /*  set $_core 1 => Jc01 packet is sent                                    */
  51 /*  print $_core => jc packet is sent and result is affected in $          */
  52 /*  Another way to test this packet is the usage of maintenance packet     */
  53 /*  maint packet Jc01                                                      */
  54 /*  maint packet jc                                                        */
  55
  56 static const char DIGITS[16] = "0123456789abcdef";
  57
  58 /* packet j :smp status request */
  59 int gdb_read_smp_packet(struct connection *connection,
  60                 char *packet, int packet_size)
  61 {
  62         struct target *target = get_target_from_connection(connection);
  63         uint32_t len = sizeof(int32_t);
  64         uint8_t *buffer;
  65         char *hex_buffer;
  66         int retval = ERROR_OK;
  67         if (target->smp) {
  68                 if (strncmp(packet, "jc", 2) == 0) {
  69                         hex_buffer = malloc(len * 2 + 1);
  70                         buffer = (uint8_t *)&target->gdb_service->core[0];
  71                         uint32_t i;
  72                         for (i = 0; i < 4; i++) {
  73                                 uint8_t t = buffer[i];
  74                                 hex_buffer[2 * i] = DIGITS[(t >> 4) & 0xf];
  75                                 hex_buffer[2 * i + 1] = DIGITS[t & 0xf];
  76                         }
  77
  78                         retval = gdb_put_packet(connection, hex_buffer, len * 2);
  79
  80                         free(hex_buffer);
  81                 }
  82         } else
  83                 retval = gdb_put_packet(connection, "E01", 3);
  84         return retval;
  85 }
  86
  87 /* J :  smp set request */
  88 int gdb_write_smp_packet(struct connection *connection,
  89                 char *packet, int packet_size)
  90 {
  91         struct target *target = get_target_from_connection(connection);
  92         char *separator;
  93         int coreid = 0;
  94         int retval = ERROR_OK;
  95
  96         /* skip command character */
  97         if (target->smp) {
  98                 if (strncmp(packet, "Jc", 2) == 0) {
  99                         packet += 2;
 100                         coreid = strtoul(packet, &separator, 16);
 101                         target->gdb_service->core[1] = coreid;
 102                         retval = gdb_put_packet(connection, "OK", 2);
 103                 }
 104         } else
 105                 retval = gdb_put_packet(connection, "E01", 3);
 106
 107         return retval;
 108 }