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 int bdm_ppc_wait (int pid, struct target_waitstatus *target_status);
  44
  45 static void bdm_ppc_fetch_registers (int regno);
  46
  47 static void bdm_ppc_store_registers (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 (char *name, int from_tty)
  82 {
  83   CORE_ADDR watchdogaddr = 0xff000004;
  84
  85   ocd_open (name, from_tty, OCD_TARGET_MOTO_PPC, &bdm_ppc_ops);
  86
  87   /* We want interrupts to drop us into debugging mode. */
  88   /* Modify the DER register to accomplish this. */
  89   ocd_write_bdm_register (149, 0x20024000);
  90
  91   /* Disable watchdog timer on the board */
  92   ocd_write_bytes (watchdogaddr, nowatchdog, 4);
  93 }
  94
  95 /* Wait until the remote machine stops, then return,
  96    storing status in STATUS just as `wait' would.
  97    Returns "pid" (though it's not clear what, if anything, that
  98    means in the case of this target).  */
  99
 100 static int
 101 bdm_ppc_wait (int pid, struct target_waitstatus *target_status)
 102 {
 103   int stop_reason;
 104
 105   target_status->kind = TARGET_WAITKIND_STOPPED;
 106
 107   stop_reason = ocd_wait ();
 108
 109   if (stop_reason)
 110     {
 111       target_status->value.sig = TARGET_SIGNAL_INT;
 112       return inferior_pid;
 113     }
 114
 115   target_status->value.sig = TARGET_SIGNAL_TRAP;        /* XXX for now */
 116
 117 #if 0
 118   {
 119     unsigned long ecr, der;
 120
 121     ecr = ocd_read_bdm_register (148);  /* Read the exception cause register */
 122     der = ocd_read_bdm_register (149);  /* Read the debug enables register */
 123     fprintf_unfiltered (gdb_stdout, "ecr = 0x%x, der = 0x%x\n", ecr, der);
 124   }
 125 #endif
 126
 127   return inferior_pid;
 128 }
 129 \f
 130 static int bdm_regmap[] =
 131 {BDM_REGMAP};
 132
 133 /* Read the remote registers into regs.
 134    Fetch register REGNO, or all registers if REGNO == -1
 135
 136    The Wiggler uses the following codes to access the registers:
 137
 138    0 -> 1023            SPR 0 -> 1023
 139    0 - SPR 0 - MQ
 140    1 - SPR 1 - XER
 141    8 - SPR 8 - LR
 142    9 - SPR 9 - CTR (known as cnt in GDB)
 143    26 - SPR 26 - SRR0 - pc
 144    1024 -> 2047         DCR 0 -> DCR 1023 (IBM PPC 4xx only)
 145    2048 -> 2079         R0 -> R31
 146    2080 -> 2143         FP0 -> FP31 (64 bit regs) (IBM PPC 5xx only)
 147    2144                 CR (known as cnd in GDB)
 148    2145                 FPCSR
 149    2146                 MSR (known as ps in GDB)
 150  */
 151
 152 static void
 153 bdm_ppc_fetch_registers (int regno)
 154 {
 155   int i;
 156   unsigned char *regs, *beginregs, *endregs, *almostregs;
 157   unsigned char midregs[32];
 158   unsigned char mqreg[1];
 159   int first_regno, last_regno;
 160   int first_bdm_regno, last_bdm_regno;
 161   int reglen, beginreglen, endreglen;
 162
 163 #if 1
 164   for (i = 0; i < (FPLAST_REGNUM - FP0_REGNUM + 1); i++)
 165     {
 166       midregs[i] = -1;
 167     }
 168   mqreg[0] = -1;
 169 #endif
 170
 171   if (regno == -1)
 172     {
 173       first_regno = 0;
 174       last_regno = NUM_REGS - 1;
 175
 176       first_bdm_regno = 0;
 177       last_bdm_regno = BDM_NUM_REGS - 1;
 178     }
 179   else
 180     {
 181       first_regno = regno;
 182       last_regno = regno;
 183
 184       first_bdm_regno = bdm_regmap[regno];
 185       last_bdm_regno = bdm_regmap[regno];
 186     }
 187
 188   if (first_bdm_regno == -1)
 189     {
 190       supply_register (first_regno, NULL);
 191       return;                   /* Unsupported register */
 192     }
 193
 194 #if 1
 195   /* Can't ask for floating point regs on ppc 8xx, also need to
 196      avoid asking for the mq register. */
 197   if (first_regno == last_regno)        /* only want one reg */
 198     {
 199 /*      printf("Asking for register %d\n", first_regno); */
 200
 201       /* if asking for an invalid register */
 202       if ((first_regno == PPC_MQ_REGNUM) ||
 203           ((first_regno >= FP0_REGNUM) && (first_regno <= FPLAST_REGNUM)))
 204         {
 205 /*          printf("invalid reg request!\n"); */
 206           supply_register (first_regno, NULL);
 207           return;               /* Unsupported register */
 208         }
 209       else
 210         {
 211           regs = ocd_read_bdm_registers (first_bdm_regno,
 212                                          last_bdm_regno, &reglen);
 213         }
 214     }
 215   else
 216     /* want all regs */
 217     {
 218 /*      printf("Asking for registers %d to %d\n", first_regno, last_regno); */
 219       beginregs = ocd_read_bdm_registers (first_bdm_regno,
 220                                           FP0_REGNUM - 1, &beginreglen);
 221       endregs = (strcat (midregs,
 222                          ocd_read_bdm_registers (FPLAST_REGNUM + 1,
 223                                           last_bdm_regno - 1, &endreglen)));
 224       almostregs = (strcat (beginregs, endregs));
 225       regs = (strcat (almostregs, mqreg));
 226       reglen = beginreglen + 32 + endreglen + 1;
 227     }
 228
 229 #endif
 230 #if 0
 231   regs = ocd_read_bdm_registers (first_bdm_regno, last_bdm_regno, &reglen);
 232 #endif
 233
 234   for (i = first_regno; i <= last_regno; i++)
 235     {
 236       int bdm_regno, regoffset;
 237
 238       bdm_regno = bdm_regmap[i];
 239       if (bdm_regno != -1)
 240         {
 241           regoffset = bdm_regno - first_bdm_regno;
 242
 243           if (regoffset >= reglen / 4)
 244             continue;
 245
 246           supply_register (i, regs + 4 * regoffset);
 247         }
 248       else
 249         supply_register (i, NULL);      /* Unsupported register */
 250     }
 251 }
 252
 253 /* Store register REGNO, or all registers if REGNO == -1, from the contents
 254    of REGISTERS.  FIXME: ignores errors.  */
 255
 256 static void
 257 bdm_ppc_store_registers (int regno)
 258 {
 259   int i;
 260   int first_regno, last_regno;
 261   int first_bdm_regno, last_bdm_regno;
 262
 263   if (regno == -1)
 264     {
 265       first_regno = 0;
 266       last_regno = NUM_REGS - 1;
 267
 268       first_bdm_regno = 0;
 269       last_bdm_regno = BDM_NUM_REGS - 1;
 270     }
 271   else
 272     {
 273       first_regno = regno;
 274       last_regno = regno;
 275
 276       first_bdm_regno = bdm_regmap[regno];
 277       last_bdm_regno = bdm_regmap[regno];
 278     }
 279
 280   if (first_bdm_regno == -1)
 281     return;                     /* Unsupported register */
 282
 283   for (i = first_regno; i <= last_regno; i++)
 284     {
 285       int bdm_regno;
 286
 287       bdm_regno = bdm_regmap[i];
 288
 289       /* only attempt to write if it's a valid ppc 8xx register */
 290       /* (need to avoid FP regs and MQ reg) */
 291       if ((i != PPC_MQ_REGNUM) && ((i < FP0_REGNUM) || (i > FPLAST_REGNUM)))
 292         {
 293 /*          printf("write valid reg %d\n", bdm_regno); */
 294           ocd_write_bdm_registers (bdm_regno, registers + REGISTER_BYTE (i), 4);
 295         }
 296 /*
 297    else if (i == PPC_MQ_REGNUM)
 298    printf("don't write invalid reg %d (PPC_MQ_REGNUM)\n", bdm_regno);
 299    else
 300    printf("don't write invalid reg %d\n", bdm_regno);
 301  */
 302     }
 303 }
 304 \f
 305 /* Define the target subroutine names */
 306
 307 struct target_ops bdm_ppc_ops;
 308
 309 static void
 310 init_bdm_ppc_ops (void)
 311 {
 312   bdm_ppc_ops.to_shortname = "ocd";
 313   bdm_ppc_ops.to_longname = "Remote target with On-Chip Debugging";
 314   bdm_ppc_ops.to_doc = "Use a remote target with On-Chip Debugging.  To use a target box;\n\
 315 specify the serial device it is connected to (e.g. /dev/ttya).  To use\n\
 316 a wiggler, specify wiggler and then the port it is connected to\n\
 317 (e.g. wiggler lpt1).";          /* to_doc */
 318   bdm_ppc_ops.to_open = bdm_ppc_open;
 319   bdm_ppc_ops.to_close = ocd_close;
 320   bdm_ppc_ops.to_attach = NULL;
 321   bdm_ppc_ops.to_post_attach = NULL;
 322   bdm_ppc_ops.to_require_attach = NULL;
 323   bdm_ppc_ops.to_detach = ocd_detach;
 324   bdm_ppc_ops.to_require_detach = NULL;
 325   bdm_ppc_ops.to_resume = ocd_resume;
 326   bdm_ppc_ops.to_wait = bdm_ppc_wait;
 327   bdm_ppc_ops.to_post_wait = NULL;
 328   bdm_ppc_ops.to_fetch_registers = bdm_ppc_fetch_registers;
 329   bdm_ppc_ops.to_store_registers = bdm_ppc_store_registers;
 330   bdm_ppc_ops.to_prepare_to_store = ocd_prepare_to_store;
 331   bdm_ppc_ops.to_xfer_memory = ocd_xfer_memory;
 332   bdm_ppc_ops.to_files_info = ocd_files_info;
 333   bdm_ppc_ops.to_insert_breakpoint = ocd_insert_breakpoint;
 334   bdm_ppc_ops.to_remove_breakpoint = ocd_remove_breakpoint;
 335   bdm_ppc_ops.to_terminal_init = NULL;
 336   bdm_ppc_ops.to_terminal_inferior = NULL;
 337   bdm_ppc_ops.to_terminal_ours_for_output = NULL;
 338   bdm_ppc_ops.to_terminal_ours = NULL;
 339   bdm_ppc_ops.to_terminal_info = NULL;
 340   bdm_ppc_ops.to_kill = ocd_kill;
 341   bdm_ppc_ops.to_load = ocd_load;
 342   bdm_ppc_ops.to_lookup_symbol = NULL;
 343   bdm_ppc_ops.to_create_inferior = ocd_create_inferior;
 344   bdm_ppc_ops.to_post_startup_inferior = NULL;
 345   bdm_ppc_ops.to_acknowledge_created_inferior = NULL;
 346   bdm_ppc_ops.to_clone_and_follow_inferior = NULL;
 347   bdm_ppc_ops.to_post_follow_inferior_by_clone = NULL;
 348   bdm_ppc_ops.to_insert_fork_catchpoint = NULL;
 349   bdm_ppc_ops.to_remove_fork_catchpoint = NULL;
 350   bdm_ppc_ops.to_insert_vfork_catchpoint = NULL;
 351   bdm_ppc_ops.to_remove_vfork_catchpoint = NULL;
 352   bdm_ppc_ops.to_has_forked = NULL;
 353   bdm_ppc_ops.to_has_vforked = NULL;
 354   bdm_ppc_ops.to_can_follow_vfork_prior_to_exec = NULL;
 355   bdm_ppc_ops.to_post_follow_vfork = NULL;
 356   bdm_ppc_ops.to_insert_exec_catchpoint = NULL;
 357   bdm_ppc_ops.to_remove_exec_catchpoint = NULL;
 358   bdm_ppc_ops.to_has_execd = NULL;
 359   bdm_ppc_ops.to_reported_exec_events_per_exec_call = NULL;
 360   bdm_ppc_ops.to_has_exited = NULL;
 361   bdm_ppc_ops.to_mourn_inferior = ocd_mourn;
 362   bdm_ppc_ops.to_can_run = 0;
 363   bdm_ppc_ops.to_notice_signals = 0;
 364   bdm_ppc_ops.to_thread_alive = ocd_thread_alive;
 365   bdm_ppc_ops.to_stop = ocd_stop;
 366   bdm_ppc_ops.to_pid_to_exec_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 }