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, 1998, 1999, 2000, 2001
   4    Free Software Foundation, Inc.
   5
   6    This file is part of GDB.
   7
   8    This program is free software; you can redistribute it and/or modify
   9    it under the terms of the GNU General Public License as published by
  10    the Free Software Foundation; either version 2 of the License, or
  11    (at your option) any later version.
  12
  13    This program is distributed in the hope that it will be useful,
  14    but WITHOUT ANY WARRANTY; without even the implied warranty of
  15    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16    GNU General Public License for more details.
  17
  18    You should have received a copy of the GNU General Public License
  19    along with this program; if not, write to the Free Software
  20    Foundation, Inc., 59 Temple Place - Suite 330,
  21    Boston, MA 02111-1307, USA.  */
  22
  23 #include "defs.h"
  24 #include "gdbcore.h"
  25 #include "gdb_string.h"
  26 #include <fcntl.h>
  27 #include "frame.h"
  28 #include "inferior.h"
  29 #include "bfd.h"
  30 #include "symfile.h"
  31 #include "target.h"
  32 #include "gdbcmd.h"
  33 #include "objfiles.h"
  34 #include "gdb-stabs.h"
  35 #include <sys/types.h>
  36 #include "serial.h"
  37 #include "ocd.h"
  38 #include "ppc-tdep.h"
  39 #include "regcache.h"
  40
  41 static void bdm_ppc_open (char *name, int from_tty);
  42
  43 static ptid_t bdm_ppc_wait (ptid_t ptid,
  44                             struct target_waitstatus *target_status);
  45
  46 static void bdm_ppc_fetch_registers (int regno);
  47
  48 static void bdm_ppc_store_registers (int regno);
  49
  50 extern struct target_ops bdm_ppc_ops;   /* Forward decl */
  51 \f
  52 /*#define BDM_NUM_REGS 71 */
  53 #define BDM_NUM_REGS 24
  54
  55 #define BDM_REGMAP \
  56         2048, 2049, 2050, 2051, 2052, 2053, 2054, 2055, /* r0-r7 */ \
  57         2056, 2057, 2058, 2059, 2060, 2061, 2062, 2063, /* r8-r15 */ \
  58         2064, 2065, 2066, 2067, 2068, 2069, 2070, 2071, /* r16-r23 */ \
  59         2072, 2073, 2074, 2075, 2076, 2077, 2078, 2079, /* r24-r31 */ \
  60 \
  61         2080, 2082, 2084, 2086, 2088, 2090, 2092, 2094, /* fp0->fp8 */ \
  62         2096, 2098, 2100, 2102, 2104, 2106, 2108, 2110, /* fp0->fp8 */ \
  63         2112, 2114, 2116, 2118, 2120, 2122, 2124, 2126, /* fp0->fp8 */ \
  64         2128, 2130, 2132, 2134, 2136, 2138, 2140, 2142, /* fp0->fp8 */ \
  65 \
  66         26,        /* pc (SRR0 (SPR 26)) */ \
  67         2146,      /* ps (MSR) */ \
  68         2144,      /* cnd (CR) */ \
  69         8,         /* lr (SPR 8) */ \
  70         9,         /* cnt (CTR (SPR 9)) */ \
  71         1,         /* xer (SPR 1) */ \
  72         0,                      /* mq (SPR 0) */
  73 \f
  74
  75 char nowatchdog[4] =
  76 {0xff, 0xff, 0xff, 0x88};
  77
  78 /* Open a connection to a remote debugger.
  79    NAME is the filename used for communication.  */
  80
  81 static void
  82 bdm_ppc_open (char *name, 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 ptid_t
 102 bdm_ppc_wait (ptid_t ptid, struct target_waitstatus *target_status)
 103 {
 104   int stop_reason;
 105
 106   target_status->kind = TARGET_WAITKIND_STOPPED;
 107
 108   stop_reason = ocd_wait ();
 109
 110   if (stop_reason)
 111     {
 112       target_status->value.sig = TARGET_SIGNAL_INT;
 113       return inferior_ptid;
 114     }
 115
 116   target_status->value.sig = TARGET_SIGNAL_TRAP;        /* XXX for now */
 117
 118 #if 0
 119   {
 120     unsigned long ecr, der;
 121
 122     ecr = ocd_read_bdm_register (148);  /* Read the exception cause register */
 123     der = ocd_read_bdm_register (149);  /* Read the debug enables register */
 124     fprintf_unfiltered (gdb_stdout, "ecr = 0x%x, der = 0x%x\n", ecr, der);
 125   }
 126 #endif
 127
 128   return inferior_ptid;
 129 }
 130 \f
 131 static int bdm_regmap[] =
 132 {BDM_REGMAP};
 133
 134 /* Read the remote registers into regs.
 135    Fetch register REGNO, or all registers if REGNO == -1
 136
 137    The Wiggler uses the following codes to access the registers:
 138
 139    0 -> 1023            SPR 0 -> 1023
 140    0 - SPR 0 - MQ
 141    1 - SPR 1 - XER
 142    8 - SPR 8 - LR
 143    9 - SPR 9 - CTR (known as cnt in GDB)
 144    26 - SPR 26 - SRR0 - pc
 145    1024 -> 2047         DCR 0 -> DCR 1023 (IBM PPC 4xx only)
 146    2048 -> 2079         R0 -> R31
 147    2080 -> 2143         FP0 -> FP31 (64 bit regs) (IBM PPC 5xx only)
 148    2144                 CR (known as cnd in GDB)
 149    2145                 FPCSR
 150    2146                 MSR (known as ps in GDB)
 151  */
 152
 153 static void
 154 bdm_ppc_fetch_registers (int regno)
 155 {
 156   struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch);
 157   int i;
 158   unsigned char *regs, *beginregs, *endregs, *almostregs;
 159   unsigned char midregs[32];
 160   unsigned char mqreg[1];
 161   int first_regno, last_regno;
 162   int first_bdm_regno, last_bdm_regno;
 163   int reglen, beginreglen, endreglen;
 164
 165 #if 1
 166   for (i = 0; i < ppc_num_fprs; i++)
 167     {
 168       midregs[i] = -1;
 169     }
 170   mqreg[0] = -1;
 171 #endif
 172
 173   if (regno == -1)
 174     {
 175       first_regno = 0;
 176       last_regno = NUM_REGS - 1;
 177
 178       first_bdm_regno = 0;
 179       last_bdm_regno = BDM_NUM_REGS - 1;
 180     }
 181   else
 182     {
 183       first_regno = regno;
 184       last_regno = regno;
 185
 186       first_bdm_regno = bdm_regmap[regno];
 187       last_bdm_regno = bdm_regmap[regno];
 188     }
 189
 190   if (first_bdm_regno == -1)
 191     {
 192       supply_register (first_regno, NULL);
 193       return;                   /* Unsupported register */
 194     }
 195
 196 #if 1
 197   /* Can't ask for floating point regs on ppc 8xx, also need to
 198      avoid asking for the mq register. */
 199   if (first_regno == last_regno)        /* only want one reg */
 200     {
 201 /*      printf("Asking for register %d\n", first_regno); */
 202
 203       /* if asking for an invalid register */
 204       if ((first_regno == gdbarch_tdep (current_gdbarch)->ppc_mq_regnum)
 205           || (first_regno == gdbarch_tdep (current_gdbarch)->ppc_fpscr_regnum)
 206           || ((first_regno >= tdep->ppc_fp0_regnum)
 207               && (first_regno < tdep->ppc_fp0_regnum + ppc_num_fprs)))
 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                                           tdep->ppc_fp0_regnum - 1,
 225                                           &beginreglen);
 226       endregs
 227         = (strcat (midregs,
 228                    ocd_read_bdm_registers (tdep->ppc_fp0_regnum + ppc_num_fprs,
 229                                            last_bdm_regno - 1, &endreglen)));
 230       almostregs = (strcat (beginregs, endregs));
 231       regs = (strcat (almostregs, mqreg));
 232       reglen = beginreglen + 32 + endreglen + 1;
 233     }
 234
 235 #endif
 236 #if 0
 237   regs = ocd_read_bdm_registers (first_bdm_regno, last_bdm_regno, &reglen);
 238 #endif
 239
 240   for (i = first_regno; i <= last_regno; i++)
 241     {
 242       int bdm_regno, regoffset;
 243
 244       bdm_regno = bdm_regmap[i];
 245       if (bdm_regno != -1)
 246         {
 247           regoffset = bdm_regno - first_bdm_regno;
 248
 249           if (regoffset >= reglen / 4)
 250             continue;
 251
 252           supply_register (i, regs + 4 * regoffset);
 253         }
 254       else
 255         supply_register (i, NULL);      /* Unsupported register */
 256     }
 257 }
 258
 259 /* Store register REGNO, or all registers if REGNO == -1, from the contents
 260    of REGISTERS.  FIXME: ignores errors.  */
 261
 262 static void
 263 bdm_ppc_store_registers (int regno)
 264 {
 265   struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch);
 266   int i;
 267   int first_regno, last_regno;
 268   int first_bdm_regno, last_bdm_regno;
 269
 270   if (regno == -1)
 271     {
 272       first_regno = 0;
 273       last_regno = NUM_REGS - 1;
 274
 275       first_bdm_regno = 0;
 276       last_bdm_regno = BDM_NUM_REGS - 1;
 277     }
 278   else
 279     {
 280       first_regno = regno;
 281       last_regno = regno;
 282
 283       first_bdm_regno = bdm_regmap[regno];
 284       last_bdm_regno = bdm_regmap[regno];
 285     }
 286
 287   if (first_bdm_regno == -1)
 288     return;                     /* Unsupported register */
 289
 290   for (i = first_regno; i <= last_regno; i++)
 291     {
 292       int bdm_regno;
 293
 294       bdm_regno = bdm_regmap[i];
 295
 296       /* only attempt to write if it's a valid ppc 8xx register */
 297       /* (need to avoid FP regs and MQ reg) */
 298       if ((i != gdbarch_tdep (current_gdbarch)->ppc_mq_regnum)
 299           && (i != gdbarch_tdep (current_gdbarch)->ppc_fpscr_regnum)
 300           && ((i < tdep->ppc_fp0_regnum)
 301               || (i >= tdep->ppc_fp0_regnum + ppc_num_fprs)))
 302         {
 303 /*          printf("write valid reg %d\n", bdm_regno); */
 304           ocd_write_bdm_registers (bdm_regno, deprecated_registers + DEPRECATED_REGISTER_BYTE (i), 4);
 305         }
 306 /*
 307    else if (i == gdbarch_tdep (current_gdbarch)->ppc_mq_regnum)
 308    printf("don't write invalid reg %d (PPC_MQ_REGNUM)\n", bdm_regno);
 309    else
 310    printf("don't write invalid reg %d\n", bdm_regno);
 311  */
 312     }
 313 }
 314 \f
 315 /* Define the target subroutine names */
 316
 317 struct target_ops bdm_ppc_ops;
 318
 319 static void
 320 init_bdm_ppc_ops (void)
 321 {
 322   bdm_ppc_ops.to_shortname = "ocd";
 323   bdm_ppc_ops.to_longname = "Remote target with On-Chip Debugging";
 324   bdm_ppc_ops.to_doc = "Use a remote target with On-Chip Debugging.  To use a target box;\n\
 325 specify the serial device it is connected to (e.g. /dev/ttya).  To use\n\
 326 a wiggler, specify wiggler and then the port it is connected to\n\
 327 (e.g. wiggler lpt1).";          /* to_doc */
 328   bdm_ppc_ops.to_open = bdm_ppc_open;
 329   bdm_ppc_ops.to_close = ocd_close;
 330   bdm_ppc_ops.to_detach = ocd_detach;
 331   bdm_ppc_ops.to_resume = ocd_resume;
 332   bdm_ppc_ops.to_wait = bdm_ppc_wait;
 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_kill = ocd_kill;
 341   bdm_ppc_ops.to_load = ocd_load;
 342   bdm_ppc_ops.to_create_inferior = ocd_create_inferior;
 343   bdm_ppc_ops.to_mourn_inferior = ocd_mourn;
 344   bdm_ppc_ops.to_thread_alive = ocd_thread_alive;
 345   bdm_ppc_ops.to_stop = ocd_stop;
 346   bdm_ppc_ops.to_stratum = process_stratum;
 347   bdm_ppc_ops.to_has_all_memory = 1;
 348   bdm_ppc_ops.to_has_memory = 1;
 349   bdm_ppc_ops.to_has_stack = 1;
 350   bdm_ppc_ops.to_has_registers = 1;
 351   bdm_ppc_ops.to_has_execution = 1;
 352   bdm_ppc_ops.to_magic = OPS_MAGIC;
 353 }                               /* init_bdm_ppc_ops */
 354
 355 extern initialize_file_ftype _initialize_bdm_ppc; /* -Wmissing-prototypes */
 356
 357 void
 358 _initialize_bdm_ppc (void)
 359 {
 360   init_bdm_ppc_ops ();
 361   add_target (&bdm_ppc_ops);
 362 }