gdb/ppc-bdm.c

   1 /* Remote target communications for the Macraigor Systems BDM Wiggler
   2    talking to a Motorola PPC 505.
   3    Copyright 1996, 1997 Free Software Foundation, Inc.
   4
   5 This file is part of GDB.
   6
   7 This program is free software; you can redistribute it and/or modify
   8 it under the terms of the GNU General Public License as published by
   9 the Free Software Foundation; either version 2 of the License, or
  10 (at your option) any later version.
  11
  12 This program is distributed in the hope that it will be useful,
  13 but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 GNU General Public License for more details.
  16
  17 You should have received a copy of the GNU General Public License
  18 along with this program; if not, write to the Free Software
  19 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
  20
  21 #include "defs.h"
  22 #include "gdbcore.h"
  23 #include "gdb_string.h"
  24 #include <fcntl.h>
  25 #include "frame.h"
  26 #include "inferior.h"
  27 #include "bfd.h"
  28 #include "symfile.h"
  29 #include "target.h"
  30 #include "wait.h"
  31 #include "gdbcmd.h"
  32 #include "objfiles.h"
  33 #include "gdb-stabs.h"
  34 #include <sys/types.h>
  35 #include <signal.h>
  36 #include "serial.h"
  37 #include "ocd.h"
  38
  39 static void bdm_ppc_open PARAMS ((char *name, int from_tty));
  40
  41 static int bdm_ppc_wait PARAMS ((int pid,
  42                                  struct target_waitstatus *target_status));
  43
  44 static void bdm_ppc_fetch_registers PARAMS ((int regno));
  45
  46 static void bdm_ppc_store_registers PARAMS ((int regno));
  47
  48 extern struct target_ops bdm_ppc_ops;   /* Forward decl */
  49 \f
  50 /* Open a connection to a remote debugger.
  51    NAME is the filename used for communication.  */
  52
  53 static void
  54 bdm_ppc_open (name, from_tty)
  55      char *name;
  56      int from_tty;
  57 {
  58   wiggler_open (name, from_tty, WIGGLER_TARGET_MOTO_PPC, &bdm_ppc_ops);
  59 }
  60
  61 /* Wait until the remote machine stops, then return,
  62    storing status in STATUS just as `wait' would.
  63    Returns "pid" (though it's not clear what, if anything, that
  64    means in the case of this target).  */
  65
  66 static int
  67 bdm_ppc_wait (pid, target_status)
  68      int pid;
  69      struct target_waitstatus *target_status;
  70 {
  71   int stop_reason;
  72
  73   target_status->kind = TARGET_WAITKIND_STOPPED;
  74
  75   stop_reason = wiggler_wait ();
  76
  77   if (stop_reason)
  78     {
  79       target_status->value.sig = TARGET_SIGNAL_INT;
  80       return inferior_pid;
  81     }
  82
  83   target_status->value.sig = TARGET_SIGNAL_TRAP; /* XXX for now */
  84
  85   {
  86     unsigned long ecr, der;
  87
  88     ecr = wiggler_read_bdm_register (148); /* Read the exception cause register */
  89     der = wiggler_read_bdm_register (149); /* Read the debug enables register */
  90     fprintf_unfiltered (gdb_stdout, "ecr = 0x%x, der = 0x%x\n", ecr, der);
  91   }
  92
  93   return inferior_pid;
  94 }
  95 \f
  96 static int bdm_regmap[] = {BDM_REGMAP};
  97
  98 /* Read the remote registers into regs.
  99
 100    The Wiggler uses the following codes to access the registers:
 101
 102    0 -> 1023            SPR 0 -> 1023
 103         0 - SPR 0 - MQ
 104         1 - SPR 1 - XER
 105         8 - SPR 8 - LR
 106         9 - SPR 9 - CTR (known as cnt in GDB)
 107         26 - SPR 26 - SRR0 - pc
 108    1024 -> 2047         DCR 0 -> DCR 1023 (IBM PPC 4xx only)
 109    2048 -> 2079         R0 -> R31
 110    2080 -> 2143         FP0 -> FP31 (64 bit regs)
 111    2144                 CR (known as cnd in GDB)
 112    2145                 FPCSR
 113    2146                 MSR (known as ps in GDB)
 114  */
 115
 116 static void
 117 bdm_ppc_fetch_registers (regno)
 118      int regno;
 119 {
 120   int i;
 121   unsigned char *regs;
 122   int first_regno, last_regno;
 123   int first_bdm_regno, last_bdm_regno;
 124   int reglen;
 125
 126   if (regno == -1)
 127     {
 128       first_regno = 0;
 129       last_regno = NUM_REGS - 1;
 130
 131       first_bdm_regno = 0;
 132       last_bdm_regno = BDM_NUM_REGS - 1;
 133     }
 134   else
 135     {
 136       first_regno = regno;
 137       last_regno = regno;
 138
 139       first_bdm_regno = bdm_regmap [regno];
 140       last_bdm_regno = bdm_regmap [regno];
 141     }
 142
 143   if (first_bdm_regno == -1)
 144     {
 145       supply_register (first_regno, NULL);
 146       return;                   /* Unsupported register */
 147     }
 148
 149   regs = wiggler_read_bdm_registers (first_bdm_regno, last_bdm_regno, &reglen);
 150
 151   for (i = first_regno; i <= last_regno; i++)
 152     {
 153       int bdm_regno, regoffset;
 154
 155       bdm_regno = bdm_regmap [i];
 156       if (bdm_regno != -1)
 157         {
 158           regoffset = bdm_regno - first_bdm_regno;
 159
 160           if (regoffset >= reglen / 4)
 161             continue;
 162
 163           supply_register (i, regs + 4 * regoffset);
 164         }
 165       else
 166         supply_register (i, NULL); /* Unsupported register */
 167     }
 168 }
 169
 170 /* Store register REGNO, or all registers if REGNO == -1, from the contents
 171    of REGISTERS.  FIXME: ignores errors.  */
 172
 173 static void
 174 bdm_ppc_store_registers (regno)
 175      int regno;
 176 {
 177   int i;
 178   int first_regno, last_regno;
 179   int first_bdm_regno, last_bdm_regno;
 180
 181   if (regno == -1)
 182     {
 183       first_regno = 0;
 184       last_regno = NUM_REGS - 1;
 185
 186       first_bdm_regno = 0;
 187       last_bdm_regno = BDM_NUM_REGS - 1;
 188     }
 189   else
 190     {
 191       first_regno = regno;
 192       last_regno = regno;
 193
 194       first_bdm_regno = bdm_regmap [regno];
 195       last_bdm_regno = bdm_regmap [regno];
 196     }
 197
 198   if (first_bdm_regno == -1)
 199     return;                     /* Unsupported register */
 200
 201   for (i = first_regno; i <= last_regno; i++)
 202     {
 203       int bdm_regno;
 204
 205       bdm_regno = bdm_regmap [i];
 206
 207       wiggler_write_bdm_registers (bdm_regno, registers + REGISTER_BYTE (i), 4);
 208     }
 209 }
 210 \f
 211 /* Define the target subroutine names */
 212
 213 struct target_ops bdm_ppc_ops = {
 214   "wiggler",                    /* to_shortname */
 215   "",                           /* to_longname */
 216   "",                           /* to_doc */
 217   bdm_ppc_open,                 /* to_open */
 218   wiggler_close,                /* to_close */
 219   NULL,                         /* to_attach */
 220   wiggler_detach,               /* to_detach */
 221   wiggler_resume,               /* to_resume */
 222   bdm_ppc_wait,                 /* to_wait */
 223   bdm_ppc_fetch_registers,      /* to_fetch_registers */
 224   bdm_ppc_store_registers,      /* to_store_registers */
 225   wiggler_prepare_to_store,     /* to_prepare_to_store */
 226   wiggler_xfer_memory,          /* to_xfer_memory */
 227   wiggler_files_info,           /* to_files_info */
 228   memory_insert_breakpoint,     /* to_insert_breakpoint */
 229   memory_remove_breakpoint,     /* to_remove_breakpoint */
 230   NULL,                         /* to_terminal_init */
 231   NULL,                         /* to_terminal_inferior */
 232   NULL,                         /* to_terminal_ours_for_output */
 233   NULL,                         /* to_terminal_ours */
 234   NULL,                         /* to_terminal_info */
 235   wiggler_kill,                 /* to_kill */
 236   wiggler_load,                 /* to_load */
 237   NULL,                         /* to_lookup_symbol */
 238   wiggler_create_inferior,      /* to_create_inferior */
 239   wiggler_mourn,                /* to_mourn_inferior */
 240   0,                            /* to_can_run */
 241   0,                            /* to_notice_signals */
 242   wiggler_thread_alive,         /* to_thread_alive */
 243   wiggler_stop,                 /* to_stop */
 244   process_stratum,              /* to_stratum */
 245   NULL,                         /* to_next */
 246   1,                            /* to_has_all_memory */
 247   1,                            /* to_has_memory */
 248   1,                            /* to_has_stack */
 249   1,                            /* to_has_registers */
 250   1,                            /* to_has_execution */
 251   NULL,                         /* sections */
 252   NULL,                         /* sections_end */
 253   OPS_MAGIC                     /* to_magic */
 254 };
 255
 256 void
 257 _initialize_bdm_ppc ()
 258 {
 259   add_target (&bdm_ppc_ops);
 260 }