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 #ifdef HAVE_CONFIG_H
  21 #include "config.h"
  22 #endif
  23
  24 #include "server/server.h"
  25 #include <helper/types.h>
  26
  27 #include "target/target.h"
  28
  29 #include "server/gdb_server.h"
  30 #include "smp.h"
  31
  32
  33 /*  implementation of new packet in gdb interface for smp feature          */
  34 /*                                                                         */
  35 /*   j : smp  status request                                               */
  36 /*   J : smp  set request                                                  */
  37 /*                                                                         */
  38 /*   jc :read core id displayed by gdb connection                          */
  39 /*   reply XXXXXXXX core id is int32_t , 8 hex digits                      */
  40 /*                                                                         */
  41 /*   Reply ENN error not supported (target not smp)                        */
  42 /*                                                                         */
  43 /*   JcXX  set core id displayed at next gdb continue                      */
  44 /*   maximum 8 bytes described core id int32_t (8 hex digits)              */
  45 /*  (core id -1 , reserved for returning to normal continue mode) */
  46 /*  Reply ENN error not supported(target not smp,core id out of range)     */
  47 /*  Reply OK : for success                                                 */
  48 /*                                                                         */
  49 /*  handling of this packet within gdb can be done by the creation         */
  50 /*  internal variable by mean of function allocate_computed_value          */
  51 /*  set $_core 1 => Jc01 packet is sent                                    */
  52 /*  print $_core => jc packet is sent and result is affected in $          */
  53 /*  Another way to test this packet is the usage of maintenance packet     */
  54 /*  maint packet Jc01                                                      */
  55 /*  maint packet jc                                                        */
  56
  57 static const char DIGITS[16] = "0123456789abcdef";
  58
  59
  60 /* packet j :smp status request */
  61 int gdb_read_smp_packet(struct connection *connection,
  62                 struct target *target, char *packet, int packet_size)
  63 {
  64         uint32_t len = sizeof(int32_t);
  65         uint8_t *buffer;
  66         char *hex_buffer;
  67         int retval = ERROR_OK;
  68         if (target->smp)
  69         {
  70                 if (strstr(packet, "jc"))
  71                 {
  72                         hex_buffer = malloc(len * 2 + 1);
  73                         buffer = (uint8_t *)&target->gdb_service->core[0];
  74                         uint32_t i;
  75                         for (i = 0; i < 4; i++)
  76                         {
  77                                 uint8_t t = buffer[i];
  78                                 hex_buffer[2 * i] = DIGITS[(t >> 4) & 0xf];
  79                                 hex_buffer[2 * i + 1] = DIGITS[t & 0xf];
  80                         }
  81
  82                         gdb_put_packet(connection, hex_buffer, len * 2);
  83
  84                         free(hex_buffer);
  85                 }
  86         }
  87         else
  88                 retval = gdb_put_packet(connection,"E01",3);
  89         return retval;
  90 }
  91
  92 /* J :  smp set request */
  93 int gdb_write_smp_packet(struct connection *connection,
  94                 struct target *target, char *packet, int packet_size)
  95 {
  96         char *separator;
  97         int coreid = 0;
  98
  99         /* skip command character */
 100         if (target->smp)
 101         {
 102                 if (strstr(packet, "Jc"))
 103                 {
 104                         packet+=2;
 105                         coreid = strtoul(packet, &separator, 16);
 106                         target->gdb_service->core[1] = coreid;
 107                         gdb_put_packet(connection, "OK", 2);
 108                 }
 109         }
 110         else
 111         {
 112                 gdb_put_packet(connection,"E01",3);
 113         }
 114
 115         return ERROR_OK;
 116 }