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 "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 PARAMS ((char *name, int from_tty));
  41
  42 static int bdm_ppc_wait PARAMS ((int pid,
  43                                  struct target_waitstatus * target_status));
  44
  45 static void bdm_ppc_fetch_registers PARAMS ((int regno));
  46
  47 static void bdm_ppc_store_registers PARAMS ((int regno));
  48
  49 extern struct target_ops bdm_ppc_ops;   /* Forward decl */
  50 \f
  51 /*#define BDM_NUM_REGS 71 */
  52 #define BDM_NUM_REGS 24
  53
  54 #define BDM_REGMAP \
  55         2048, 2049, 2050, 2051, 2052, 2053, 2054, 2055, /* r0-r7 */ \
  56         2056, 2057, 2058, 2059, 2060, 2061, 2062, 2063, /* r8-r15 */ \
  57         2064, 2065, 2066, 2067, 2068, 2069, 2070, 2071, /* r16-r23 */ \
  58         2072, 2073, 2074, 2075, 2076, 2077, 2078, 2079, /* r24-r31 */ \
  59 \
  60         2080, 2082, 2084, 2086, 2088, 2090, 2092, 2094, /* fp0->fp8 */ \
  61         2096, 2098, 2100, 2102, 2104, 2106, 2108, 2110, /* fp0->fp8 */ \
  62         2112, 2114, 2116, 2118, 2120, 2122, 2124, 2126, /* fp0->fp8 */ \
  63         2128, 2130, 2132, 2134, 2136, 2138, 2140, 2142, /* fp0->fp8 */ \
  64 \
  65         26,        /* pc (SRR0 (SPR 26)) */ \
  66         2146,      /* ps (MSR) */ \
  67         2144,      /* cnd (CR) */ \
  68         8,         /* lr (SPR 8) */ \
  69         9,         /* cnt (CTR (SPR 9)) */ \
  70         1,         /* xer (SPR 1) */ \
  71         0,                      /* mq (SPR 0) */
  72 \f
  73
  74 char nowatchdog[4] =
  75 {0xff, 0xff, 0xff, 0x88};
  76
  77 /* Open a connection to a remote debugger.
  78    NAME is the filename used for communication.  */
  79
  80 static void
  81 bdm_ppc_open (name, from_tty)
  82      char *name;
  83      int from_tty;
  84 {
  85   CORE_ADDR watchdogaddr = 0xff000004;
  86
  87   ocd_open (name, from_tty, OCD_TARGET_MOTO_PPC, &bdm_ppc_ops);
  88
  89   /* We want interrupts to drop us into debugging mode. */
  90   /* Modify the DER register to accomplish this. */
  91   ocd_write_bdm_register (149, 0x20024000);
  92
  93   /* Disable watchdog timer on the board */
  94   ocd_write_bytes (watchdogaddr, nowatchdog, 4);
  95 }
  96
  97 /* Wait until the remote machine stops, then return,
  98    storing status in STATUS just as `wait' would.
  99    Returns "pid" (though it's not clear what, if anything, that
 100    means in the case of this target).  */
 101
 102 static int
 103 bdm_ppc_wait (pid, target_status)
 104      int pid;
 105      struct target_waitstatus *target_status;
 106 {
 107   int stop_reason;
 108
 109   target_status->kind = TARGET_WAITKIND_STOPPED;
 110
 111   stop_reason = ocd_wait ();
 112
 113   if (stop_reason)
 114     {
 115       target_status->value.sig = TARGET_SIGNAL_INT;
 116       return inferior_pid;
 117     }
 118
 119   target_status->value.sig = TARGET_SIGNAL_TRAP;        /* XXX for now */
 120
 121 #if 0
 122   {
 123     unsigned long ecr, der;
 124
 125     ecr = ocd_read_bdm_register (148);  /* Read the exception cause register */
 126     der = ocd_read_bdm_register (149);  /* Read the debug enables register */
 127     fprintf_unfiltered (gdb_stdout, "ecr = 0x%x, der = 0x%x\n", ecr, der);
 128   }
 129 #endif
 130
 131   return inferior_pid;
 132 }
 133 \f
 134 static int bdm_regmap[] =
 135 {BDM_REGMAP};
 136
 137 /* Read the remote registers into regs.
 138    Fetch register REGNO, or all registers if REGNO == -1
 139
 140    The Wiggler uses the following codes to access the registers:
 141
 142    0 -> 1023            SPR 0 -> 1023
 143    0 - SPR 0 - MQ
 144    1 - SPR 1 - XER
 145    8 - SPR 8 - LR
 146    9 - SPR 9 - CTR (known as cnt in GDB)
 147    26 - SPR 26 - SRR0 - pc
 148    1024 -> 2047         DCR 0 -> DCR 1023 (IBM PPC 4xx only)
 149    2048 -> 2079         R0 -> R31
 150    2080 -> 2143         FP0 -> FP31 (64 bit regs) (IBM PPC 5xx only)
 151    2144                 CR (known as cnd in GDB)
 152    2145                 FPCSR
 153    2146                 MSR (known as ps in GDB)
 154  */
 155
 156 static void
 157 bdm_ppc_fetch_registers (regno)
 158      int regno;
 159 {
 160   int i;
 161   unsigned char *regs, *beginregs, *endregs, *almostregs;
 162   unsigned char midregs[32];
 163   unsigned char mqreg[1];
 164   int first_regno, last_regno;
 165   int first_bdm_regno, last_bdm_regno;
 166   int reglen, beginreglen, endreglen;
 167
 168 #if 1
 169   for (i = 0; i < (FPLAST_REGNUM - FP0_REGNUM + 1); i++)
 170     {
 171       midregs[i] = -1;
 172     }
 173   mqreg[0] = -1;
 174 #endif
 175
 176   if (regno == -1)
 177     {
 178       first_regno = 0;
 179       last_regno = NUM_REGS - 1;
 180
 181       first_bdm_regno = 0;
 182       last_bdm_regno = BDM_NUM_REGS - 1;
 183     }
 184   else
 185     {
 186       first_regno = regno;
 187       last_regno = regno;
 188
 189       first_bdm_regno = bdm_regmap[regno];
 190       last_bdm_regno = bdm_regmap[regno];
 191     }
 192
 193   if (first_bdm_regno == -1)
 194     {
 195       supply_register (first_regno, NULL);
 196       return;                   /* Unsupported register */
 197     }
 198
 199 #if 1
 200   /* Can't ask for floating point regs on ppc 8xx, also need to
 201      avoid asking for the mq register. */
 202   if (first_regno == last_regno)        /* only want one reg */
 203     {
 204 /*      printf("Asking for register %d\n", first_regno); */
 205
 206       /* if asking for an invalid register */
 207       if ((first_regno == MQ_REGNUM) ||
 208           ((first_regno >= FP0_REGNUM) && (first_regno <= FPLAST_REGNUM)))
 209         {
 210 /*          printf("invalid reg request!\n"); */
 211           supply_register (first_regno, NULL);
 212           return;               /* Unsupported register */
 213         }
 214       else
 215         {
 216           regs = ocd_read_bdm_registers (first_bdm_regno,
 217                                          last_bdm_regno, &reglen);
 218         }
 219     }
 220   else
 221     /* want all regs */
 222     {
 223 /*      printf("Asking for registers %d to %d\n", first_regno, last_regno); */
 224       beginregs = ocd_read_bdm_registers (first_bdm_regno,
 225                                           FP0_REGNUM - 1, &beginreglen);
 226       endregs = (strcat (midregs,
 227                          ocd_read_bdm_registers (FPLAST_REGNUM + 1,
 228                                           last_bdm_regno - 1, &endreglen)));
 229       almostregs = (strcat (beginregs, endregs));
 230       regs = (strcat (almostregs, mqreg));
 231       reglen = beginreglen + 32 + endreglen + 1;
 232     }
 233
 234 #endif
 235 #if 0
 236   regs = ocd_read_bdm_registers (first_bdm_regno, last_bdm_regno, &reglen);
 237 #endif
 238
 239   for (i = first_regno; i <= last_regno; i++)
 240     {
 241       int bdm_regno, regoffset;
 242
 243       bdm_regno = bdm_regmap[i];
 244       if (bdm_regno != -1)
 245         {
 246           regoffset = bdm_regno - first_bdm_regno;
 247
 248           if (regoffset >= reglen / 4)
 249             continue;
 250
 251           supply_register (i, regs + 4 * regoffset);
 252         }
 253       else
 254         supply_register (i, NULL);      /* Unsupported register */
 255     }
 256 }
 257
 258 /* Store register REGNO, or all registers if REGNO == -1, from the contents
 259    of REGISTERS.  FIXME: ignores errors.  */
 260
 261 static void
 262 bdm_ppc_store_registers (regno)
 263      int regno;
 264 {
 265   int i;
 266   int first_regno, last_regno;
 267   int first_bdm_regno, last_bdm_regno;
 268
 269   if (regno == -1)
 270     {
 271       first_regno = 0;
 272       last_regno = NUM_REGS - 1;
 273
 274       first_bdm_regno = 0;
 275       last_bdm_regno = BDM_NUM_REGS - 1;
 276     }
 277   else
 278     {
 279       first_regno = regno;
 280       last_regno = regno;
 281
 282       first_bdm_regno = bdm_regmap[regno];
 283       last_bdm_regno = bdm_regmap[regno];
 284     }
 285
 286   if (first_bdm_regno == -1)
 287     return;                     /* Unsupported register */
 288
 289   for (i = first_regno; i <= last_regno; i++)
 290     {
 291       int bdm_regno;
 292
 293       bdm_regno = bdm_regmap[i];
 294
 295       /* only attempt to write if it's a valid ppc 8xx register */
 296       /* (need to avoid FP regs and MQ reg) */
 297       if ((i != MQ_REGNUM) && ((i < FP0_REGNUM) || (i > FPLAST_REGNUM)))
 298         {
 299 /*          printf("write valid reg %d\n", bdm_regno); */
 300           ocd_write_bdm_registers (bdm_regno, registers + REGISTER_BYTE (i), 4);
 301         }
 302 /*
 303    else if (i == MQ_REGNUM)
 304    printf("don't write invalid reg %d (MQ_REGNUM)\n", bdm_regno);
 305    else
 306    printf("don't write invalid reg %d\n", bdm_regno);
 307  */
 308     }
 309 }
 310 \f
 311 /* Define the target subroutine names */
 312
 313 struct target_ops bdm_ppc_ops;
 314
 315 static void
 316 init_bdm_ppc_ops (void)
 317 {
 318   bdm_ppc_ops.to_shortname = "ocd";
 319   bdm_ppc_ops.to_longname = "Remote target with On-Chip Debugging";
 320   bdm_ppc_ops.to_doc = "Use a remote target with On-Chip Debugging.  To use a target box;\n\
 321 specify the serial device it is connected to (e.g. /dev/ttya).  To use\n\
 322 a wiggler, specify wiggler and then the port it is connected to\n\
 323 (e.g. wiggler lpt1).";          /* to_doc */
 324   bdm_ppc_ops.to_open = bdm_ppc_open;
 325   bdm_ppc_ops.to_close = ocd_close;
 326   bdm_ppc_ops.to_attach = NULL;
 327   bdm_ppc_ops.to_post_attach = NULL;
 328   bdm_ppc_ops.to_require_attach = NULL;
 329   bdm_ppc_ops.to_detach = ocd_detach;
 330   bdm_ppc_ops.to_require_detach = NULL;
 331   bdm_ppc_ops.to_resume = ocd_resume;
 332   bdm_ppc_ops.to_wait = bdm_ppc_wait;
 333   bdm_ppc_ops.to_post_wait = NULL;
 334   bdm_ppc_ops.to_fetch_registers = bdm_ppc_fetch_registers;
 335   bdm_ppc_ops.to_store_registers = bdm_ppc_store_registers;
 336   bdm_ppc_ops.to_prepare_to_store = ocd_prepare_to_store;
 337   bdm_ppc_ops.to_xfer_memory = ocd_xfer_memory;
 338   bdm_ppc_ops.to_files_info = ocd_files_info;
 339   bdm_ppc_ops.to_insert_breakpoint = ocd_insert_breakpoint;
 340   bdm_ppc_ops.to_remove_breakpoint = ocd_remove_breakpoint;
 341   bdm_ppc_ops.to_terminal_init = NULL;
 342   bdm_ppc_ops.to_terminal_inferior = NULL;
 343   bdm_ppc_ops.to_terminal_ours_for_output = NULL;
 344   bdm_ppc_ops.to_terminal_ours = NULL;
 345   bdm_ppc_ops.to_terminal_info = NULL;
 346   bdm_ppc_ops.to_kill = ocd_kill;
 347   bdm_ppc_ops.to_load = ocd_load;
 348   bdm_ppc_ops.to_lookup_symbol = NULL;
 349   bdm_ppc_ops.to_create_inferior = ocd_create_inferior;
 350   bdm_ppc_ops.to_post_startup_inferior = NULL;
 351   bdm_ppc_ops.to_acknowledge_created_inferior = NULL;
 352   bdm_ppc_ops.to_clone_and_follow_inferior = NULL;
 353   bdm_ppc_ops.to_post_follow_inferior_by_clone = NULL;
 354   bdm_ppc_ops.to_insert_fork_catchpoint = NULL;
 355   bdm_ppc_ops.to_remove_fork_catchpoint = NULL;
 356   bdm_ppc_ops.to_insert_vfork_catchpoint = NULL;
 357   bdm_ppc_ops.to_remove_vfork_catchpoint = NULL;
 358   bdm_ppc_ops.to_has_forked = NULL;
 359   bdm_ppc_ops.to_has_vforked = NULL;
 360   bdm_ppc_ops.to_can_follow_vfork_prior_to_exec = NULL;
 361   bdm_ppc_ops.to_post_follow_vfork = NULL;
 362   bdm_ppc_ops.to_insert_exec_catchpoint = NULL;
 363   bdm_ppc_ops.to_remove_exec_catchpoint = NULL;
 364   bdm_ppc_ops.to_has_execd = NULL;
 365   bdm_ppc_ops.to_reported_exec_events_per_exec_call = NULL;
 366   bdm_ppc_ops.to_has_exited = NULL;
 367   bdm_ppc_ops.to_mourn_inferior = ocd_mourn;
 368   bdm_ppc_ops.to_can_run = 0;
 369   bdm_ppc_ops.to_notice_signals = 0;
 370   bdm_ppc_ops.to_thread_alive = ocd_thread_alive;
 371   bdm_ppc_ops.to_stop = ocd_stop;
 372   bdm_ppc_ops.to_pid_to_exec_file = NULL;
 373   bdm_ppc_ops.to_core_file_to_sym_file = NULL;
 374   bdm_ppc_ops.to_stratum = process_stratum;
 375   bdm_ppc_ops.DONT_USE = NULL;
 376   bdm_ppc_ops.to_has_all_memory = 1;
 377   bdm_ppc_ops.to_has_memory = 1;
 378   bdm_ppc_ops.to_has_stack = 1;
 379   bdm_ppc_ops.to_has_registers = 1;
 380   bdm_ppc_ops.to_has_execution = 1;
 381   bdm_ppc_ops.to_sections = NULL;
 382   bdm_ppc_ops.to_sections_end = NULL;
 383   bdm_ppc_ops.to_magic = OPS_MAGIC;
 384 }                               /* init_bdm_ppc_ops */
 385
 386 void
 387 _initialize_bdm_ppc ()
 388 {
 389   init_bdm_ppc_ops ();
 390   add_target (&bdm_ppc_ops);
 391 }