gdb/ppc-bdm.c

   1 /* Remote target communications for the Macraigor Systems BDM Wiggler
   2    talking to a Motorola PPC 8xx ADS board
   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,
  20    Boston, MA 02111-1307, USA.  */
  21
  22 #include "defs.h"
  23 #include "gdbcore.h"
  24 #include "gdb_string.h"
  25 #include <fcntl.h>
  26 #include "frame.h"
  27 #include "inferior.h"
  28 #include "bfd.h"
  29 #include "symfile.h"
  30 #include "target.h"
  31 #include "gdb_wait.h"
  32 #include "gdbcmd.h"
  33 #include "objfiles.h"
  34 #include "gdb-stabs.h"
  35 #include <sys/types.h>
  36 #include <signal.h>
  37 #include "serial.h"
  38 #include "ocd.h"
  39
  40 static void bdm_ppc_open (char *name, int from_tty);
  41
  42 static int bdm_ppc_wait (int pid, struct target_waitstatus *target_status);
  43
  44 static void bdm_ppc_fetch_registers (int regno);
  45
  46 static void bdm_ppc_store_registers (int regno);
  47
  48 extern struct target_ops bdm_ppc_ops;   /* Forward decl */
  49 \f
  50 /*#define BDM_NUM_REGS 71 */
  51 #define BDM_NUM_REGS 24
  52
  53 #define BDM_REGMAP \
  54         2048, 2049, 2050, 2051, 2052, 2053, 2054, 2055, /* r0-r7 */ \
  55         2056, 2057, 2058, 2059, 2060, 2061, 2062, 2063, /* r8-r15 */ \
  56         2064, 2065, 2066, 2067, 2068, 2069, 2070, 2071, /* r16-r23 */ \
  57         2072, 2073, 2074, 2075, 2076, 2077, 2078, 2079, /* r24-r31 */ \
  58 \
  59         2080, 2082, 2084, 2086, 2088, 2090, 2092, 2094, /* fp0->fp8 */ \
  60         2096, 2098, 2100, 2102, 2104, 2106, 2108, 2110, /* fp0->fp8 */ \
  61         2112, 2114, 2116, 2118, 2120, 2122, 2124, 2126, /* fp0->fp8 */ \
  62         2128, 2130, 2132, 2134, 2136, 2138, 2140, 2142, /* fp0->fp8 */ \
  63 \
  64         26,        /* pc (SRR0 (SPR 26)) */ \
  65         2146,      /* ps (MSR) */ \
  66         2144,      /* cnd (CR) */ \
  67         8,         /* lr (SPR 8) */ \
  68         9,         /* cnt (CTR (SPR 9)) */ \
  69         1,         /* xer (SPR 1) */ \
  70         0,                      /* mq (SPR 0) */
  71 \f
  72
  73 char nowatchdog[4] =
  74 {0xff, 0xff, 0xff, 0x88};
  75
  76 /* Open a connection to a remote debugger.
  77    NAME is the filename used for communication.  */
  78
  79 static void
  80 bdm_ppc_open (name, from_tty)
  81      char *name;
  82      int from_tty;
  83 {
  84   CORE_ADDR watchdogaddr = 0xff000004;
  85
  86   ocd_open (name, from_tty, OCD_TARGET_MOTO_PPC, &bdm_ppc_ops);
  87
  88   /* We want interrupts to drop us into debugging mode. */
  89   /* Modify the DER register to accomplish this. */
  90   ocd_write_bdm_register (149, 0x20024000);
  91
  92   /* Disable watchdog timer on the board */
  93   ocd_write_bytes (watchdogaddr, nowatchdog, 4);
  94 }
  95
  96 /* Wait until the remote machine stops, then return,
  97    storing status in STATUS just as `wait' would.
  98    Returns "pid" (though it's not clear what, if anything, that
  99    means in the case of this target).  */
 100
 101 static int
 102 bdm_ppc_wait (pid, target_status)
 103      int pid;
 104      struct target_waitstatus *target_status;
 105 {
 106   int stop_reason;
 107
 108   target_status->kind = TARGET_WAITKIND_STOPPED;
 109
 110   stop_reason = ocd_wait ();
 111
 112   if (stop_reason)
 113     {
 114       target_status->value.sig = TARGET_SIGNAL_INT;
 115       return inferior_pid;
 116     }
 117
 118   target_status->value.sig = TARGET_SIGNAL_TRAP;        /* XXX for now */
 119
 120 #if 0
 121   {
 122     unsigned long ecr, der;
 123
 124     ecr = ocd_read_bdm_register (148);  /* Read the exception cause register */
 125     der = ocd_read_bdm_register (149);  /* Read the debug enables register */
 126     fprintf_unfiltered (gdb_stdout, "ecr = 0x%x, der = 0x%x\n", ecr, der);
 127   }
 128 #endif
 129
 130   return inferior_pid;
 131 }
 132 \f
 133 static int bdm_regmap[] =
 134 {BDM_REGMAP};
 135
 136 /* Read the remote registers into regs.
 137    Fetch register REGNO, or all registers if REGNO == -1
 138
 139    The Wiggler uses the following codes to access the registers:
 140
 141    0 -> 1023            SPR 0 -> 1023
 142    0 - SPR 0 - MQ
 143    1 - SPR 1 - XER
 144    8 - SPR 8 - LR
 145    9 - SPR 9 - CTR (known as cnt in GDB)
 146    26 - SPR 26 - SRR0 - pc
 147    1024 -> 2047         DCR 0 -> DCR 1023 (IBM PPC 4xx only)
 148    2048 -> 2079         R0 -> R31
 149    2080 -> 2143         FP0 -> FP31 (64 bit regs) (IBM PPC 5xx only)
 150    2144                 CR (known as cnd in GDB)
 151    2145                 FPCSR
 152    2146                 MSR (known as ps in GDB)
 153  */
 154
 155 static void
 156 bdm_ppc_fetch_registers (regno)
 157      int regno;
 158 {
 159   int i;
 160   unsigned char *regs, *beginregs, *endregs, *almostregs;
 161   unsigned char midregs[32];
 162   unsigned char mqreg[1];
 163   int first_regno, last_regno;
 164   int first_bdm_regno, last_bdm_regno;
 165   int reglen, beginreglen, endreglen;
 166
 167 #if 1
 168   for (i = 0; i < (FPLAST_REGNUM - FP0_REGNUM + 1); i++)
 169     {
 170       midregs[i] = -1;
 171     }
 172   mqreg[0] = -1;
 173 #endif
 174
 175   if (regno == -1)
 176     {
 177       first_regno = 0;
 178       last_regno = NUM_REGS - 1;
 179
 180       first_bdm_regno = 0;
 181       last_bdm_regno = BDM_NUM_REGS - 1;
 182     }
 183   else
 184     {
 185       first_regno = regno;
 186       last_regno = regno;
 187
 188       first_bdm_regno = bdm_regmap[regno];
 189       last_bdm_regno = bdm_regmap[regno];
 190     }
 191
 192   if (first_bdm_regno == -1)
 193     {
 194       supply_register (first_regno, NULL);
 195       return;                   /* Unsupported register */
 196     }
 197
 198 #if 1
 199   /* Can't ask for floating point regs on ppc 8xx, also need to
 200      avoid asking for the mq register. */
 201   if (first_regno == last_regno)        /* only want one reg */
 202     {
 203 /*      printf("Asking for register %d\n", first_regno); */
 204
 205       /* if asking for an invalid register */
 206       if ((first_regno == MQ_REGNUM) ||
 207           ((first_regno >= FP0_REGNUM) && (first_regno <= FPLAST_REGNUM)))
 208         {
 209 /*          printf("invalid reg request!\n"); */
 210           supply_register (first_regno, NULL);
 211           return;               /* Unsupported register */
 212         }
 213       else
 214         {
 215           regs = ocd_read_bdm_registers (first_bdm_regno,
 216                                          last_bdm_regno, &reglen);
 217         }
 218     }
 219   else
 220     /* want all regs */
 221     {
 222 /*      printf("Asking for registers %d to %d\n", first_regno, last_regno); */
 223       beginregs = ocd_read_bdm_registers (first_bdm_regno,
 224                                           FP0_REGNUM - 1, &beginreglen);
 225       endregs = (strcat (midregs,
 226                          ocd_read_bdm_registers (FPLAST_REGNUM + 1,
 227                                           last_bdm_regno - 1, &endreglen)));
 228       almostregs = (strcat (beginregs, endregs));
 229       regs = (strcat (almostregs, mqreg));
 230       reglen = beginreglen + 32 + endreglen + 1;
 231     }
 232
 233 #endif
 234 #if 0
 235   regs = ocd_read_bdm_registers (first_bdm_regno, last_bdm_regno, &reglen);
 236 #endif
 237
 238   for (i = first_regno; i <= last_regno; i++)
 239     {
 240       int bdm_regno, regoffset;
 241
 242       bdm_regno = bdm_regmap[i];
 243       if (bdm_regno != -1)
 244         {
 245           regoffset = bdm_regno - first_bdm_regno;
 246
 247           if (regoffset >= reglen / 4)
 248             continue;
 249
 250           supply_register (i, regs + 4 * regoffset);
 251         }
 252       else
 253         supply_register (i, NULL);      /* Unsupported register */
 254     }
 255 }
 256
 257 /* Store register REGNO, or all registers if REGNO == -1, from the contents
 258    of REGISTERS.  FIXME: ignores errors.  */
 259
 260 static void
 261 bdm_ppc_store_registers (regno)
 262      int regno;
 263 {
 264   int i;
 265   int first_regno, last_regno;
 266   int first_bdm_regno, last_bdm_regno;
 267
 268   if (regno == -1)
 269     {
 270       first_regno = 0;
 271       last_regno = NUM_REGS - 1;
 272
 273       first_bdm_regno = 0;
 274       last_bdm_regno = BDM_NUM_REGS - 1;
 275     }
 276   else
 277     {
 278       first_regno = regno;
 279       last_regno = regno;
 280
 281       first_bdm_regno = bdm_regmap[regno];
 282       last_bdm_regno = bdm_regmap[regno];
 283     }
 284
 285   if (first_bdm_regno == -1)
 286     return;                     /* Unsupported register */
 287
 288   for (i = first_regno; i <= last_regno; i++)
 289     {
 290       int bdm_regno;
 291
 292       bdm_regno = bdm_regmap[i];
 293
 294       /* only attempt to write if it's a valid ppc 8xx register */
 295       /* (need to avoid FP regs and MQ reg) */
 296       if ((i != MQ_REGNUM) && ((i < FP0_REGNUM) || (i > FPLAST_REGNUM)))
 297         {
 298 /*          printf("write valid reg %d\n", bdm_regno); */
 299           ocd_write_bdm_registers (bdm_regno, registers + REGISTER_BYTE (i), 4);
 300         }
 301 /*
 302    else if (i == MQ_REGNUM)
 303    printf("don't write invalid reg %d (MQ_REGNUM)\n", bdm_regno);
 304    else
 305    printf("don't write invalid reg %d\n", bdm_regno);
 306  */
 307     }
 308 }
 309 \f
 310 /* Define the target subroutine names */
 311
 312 struct target_ops bdm_ppc_ops;
 313
 314 static void
 315 init_bdm_ppc_ops (void)
 316 {
 317   bdm_ppc_ops.to_shortname = "ocd";
 318   bdm_ppc_ops.to_longname = "Remote target with On-Chip Debugging";
 319   bdm_ppc_ops.to_doc = "Use a remote target with On-Chip Debugging.  To use a target box;\n\
 320 specify the serial device it is connected to (e.g. /dev/ttya).  To use\n\
 321 a wiggler, specify wiggler and then the port it is connected to\n\
 322 (e.g. wiggler lpt1).";          /* to_doc */
 323   bdm_ppc_ops.to_open = bdm_ppc_open;
 324   bdm_ppc_ops.to_close = ocd_close;
 325   bdm_ppc_ops.to_attach = NULL;
 326   bdm_ppc_ops.to_post_attach = NULL;
 327   bdm_ppc_ops.to_require_attach = NULL;
 328   bdm_ppc_ops.to_detach = ocd_detach;
 329   bdm_ppc_ops.to_require_detach = NULL;
 330   bdm_ppc_ops.to_resume = ocd_resume;
 331   bdm_ppc_ops.to_wait = bdm_ppc_wait;
 332   bdm_ppc_ops.to_post_wait = NULL;
 333   bdm_ppc_ops.to_fetch_registers = bdm_ppc_fetch_registers;
 334   bdm_ppc_ops.to_store_registers = bdm_ppc_store_registers;
 335   bdm_ppc_ops.to_prepare_to_store = ocd_prepare_to_store;
 336   bdm_ppc_ops.to_xfer_memory = ocd_xfer_memory;
 337   bdm_ppc_ops.to_files_info = ocd_files_info;
 338   bdm_ppc_ops.to_insert_breakpoint = ocd_insert_breakpoint;
 339   bdm_ppc_ops.to_remove_breakpoint = ocd_remove_breakpoint;
 340   bdm_ppc_ops.to_terminal_init = NULL;
 341   bdm_ppc_ops.to_terminal_inferior = NULL;
 342   bdm_ppc_ops.to_terminal_ours_for_output = NULL;
 343   bdm_ppc_ops.to_terminal_ours = NULL;
 344   bdm_ppc_ops.to_terminal_info = NULL;
 345   bdm_ppc_ops.to_kill = ocd_kill;
 346   bdm_ppc_ops.to_load = ocd_load;
 347   bdm_ppc_ops.to_lookup_symbol = NULL;
 348   bdm_ppc_ops.to_create_inferior = ocd_create_inferior;
 349   bdm_ppc_ops.to_post_startup_inferior = NULL;
 350   bdm_ppc_ops.to_acknowledge_created_inferior = NULL;
 351   bdm_ppc_ops.to_clone_and_follow_inferior = NULL;
 352   bdm_ppc_ops.to_post_follow_inferior_by_clone = NULL;
 353   bdm_ppc_ops.to_insert_fork_catchpoint = NULL;
 354   bdm_ppc_ops.to_remove_fork_catchpoint = NULL;
 355   bdm_ppc_ops.to_insert_vfork_catchpoint = NULL;
 356   bdm_ppc_ops.to_remove_vfork_catchpoint = NULL;
 357   bdm_ppc_ops.to_has_forked = NULL;
 358   bdm_ppc_ops.to_has_vforked = NULL;
 359   bdm_ppc_ops.to_can_follow_vfork_prior_to_exec = NULL;
 360   bdm_ppc_ops.to_post_follow_vfork = NULL;
 361   bdm_ppc_ops.to_insert_exec_catchpoint = NULL;
 362   bdm_ppc_ops.to_remove_exec_catchpoint = NULL;
 363   bdm_ppc_ops.to_has_execd = NULL;
 364   bdm_ppc_ops.to_reported_exec_events_per_exec_call = NULL;
 365   bdm_ppc_ops.to_has_exited = NULL;
 366   bdm_ppc_ops.to_mourn_inferior = ocd_mourn;
 367   bdm_ppc_ops.to_can_run = 0;
 368   bdm_ppc_ops.to_notice_signals = 0;
 369   bdm_ppc_ops.to_thread_alive = ocd_thread_alive;
 370   bdm_ppc_ops.to_stop = ocd_stop;
 371   bdm_ppc_ops.to_pid_to_exec_file = NULL;
 372   bdm_ppc_ops.to_core_file_to_sym_file = NULL;
 373   bdm_ppc_ops.to_stratum = process_stratum;
 374   bdm_ppc_ops.DONT_USE = NULL;
 375   bdm_ppc_ops.to_has_all_memory = 1;
 376   bdm_ppc_ops.to_has_memory = 1;
 377   bdm_ppc_ops.to_has_stack = 1;
 378   bdm_ppc_ops.to_has_registers = 1;
 379   bdm_ppc_ops.to_has_execution = 1;
 380   bdm_ppc_ops.to_sections = NULL;
 381   bdm_ppc_ops.to_sections_end = NULL;
 382   bdm_ppc_ops.to_magic = OPS_MAGIC;
 383 }                               /* init_bdm_ppc_ops */
 384
 385 void
 386 _initialize_bdm_ppc ()
 387 {
 388   init_bdm_ppc_ops ();
 389   add_target (&bdm_ppc_ops);
 390 }