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