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 #include "gdb_assert.h"
  41
  42 static void bdm_ppc_open (char *name, int from_tty);
  43
  44 static ptid_t bdm_ppc_wait (ptid_t ptid,
  45                             struct target_waitstatus *target_status);
  46
  47 static void bdm_ppc_fetch_registers (int regno);
  48
  49 static void bdm_ppc_store_registers (int regno);
  50
  51 extern struct target_ops bdm_ppc_ops;   /* Forward decl */
  52 \f
  53 /*#define BDM_NUM_REGS 71 */
  54 #define BDM_NUM_REGS 24
  55
  56 #define BDM_REGMAP \
  57         2048, 2049, 2050, 2051, 2052, 2053, 2054, 2055, /* r0-r7 */ \
  58         2056, 2057, 2058, 2059, 2060, 2061, 2062, 2063, /* r8-r15 */ \
  59         2064, 2065, 2066, 2067, 2068, 2069, 2070, 2071, /* r16-r23 */ \
  60         2072, 2073, 2074, 2075, 2076, 2077, 2078, 2079, /* r24-r31 */ \
  61 \
  62         2080, 2082, 2084, 2086, 2088, 2090, 2092, 2094, /* fp0->fp8 */ \
  63         2096, 2098, 2100, 2102, 2104, 2106, 2108, 2110, /* fp0->fp8 */ \
  64         2112, 2114, 2116, 2118, 2120, 2122, 2124, 2126, /* fp0->fp8 */ \
  65         2128, 2130, 2132, 2134, 2136, 2138, 2140, 2142, /* fp0->fp8 */ \
  66 \
  67         26,        /* pc (SRR0 (SPR 26)) */ \
  68         2146,      /* ps (MSR) */ \
  69         2144,      /* cnd (CR) */ \
  70         8,         /* lr (SPR 8) */ \
  71         9,         /* cnt (CTR (SPR 9)) */ \
  72         1,         /* xer (SPR 1) */ \
  73         0,                      /* mq (SPR 0) */
  74 \f
  75
  76 char nowatchdog[4] =
  77 {0xff, 0xff, 0xff, 0x88};
  78
  79 /* Open a connection to a remote debugger.
  80    NAME is the filename used for communication.  */
  81
  82 static void
  83 bdm_ppc_open (char *name, 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 ptid_t
 103 bdm_ppc_wait (ptid_t ptid, struct target_waitstatus *target_status)
 104 {
 105   int stop_reason;
 106
 107   target_status->kind = TARGET_WAITKIND_STOPPED;
 108
 109   stop_reason = ocd_wait ();
 110
 111   if (stop_reason)
 112     {
 113       target_status->value.sig = TARGET_SIGNAL_INT;
 114       return inferior_ptid;
 115     }
 116
 117   target_status->value.sig = TARGET_SIGNAL_TRAP;        /* XXX for now */
 118
 119 #if 0
 120   {
 121     unsigned long ecr, der;
 122
 123     ecr = ocd_read_bdm_register (148);  /* Read the exception cause register */
 124     der = ocd_read_bdm_register (149);  /* Read the debug enables register */
 125     fprintf_unfiltered (gdb_stdout, "ecr = 0x%x, der = 0x%x\n", ecr, der);
 126   }
 127 #endif
 128
 129   return inferior_ptid;
 130 }
 131 \f
 132 static int bdm_regmap[] =
 133 {BDM_REGMAP};
 134
 135 /* Read the remote registers into regs.
 136    Fetch register REGNO, or all registers if REGNO == -1
 137
 138    The Wiggler uses the following codes to access the registers:
 139
 140    0 -> 1023            SPR 0 -> 1023
 141    0 - SPR 0 - MQ
 142    1 - SPR 1 - XER
 143    8 - SPR 8 - LR
 144    9 - SPR 9 - CTR (known as cnt in GDB)
 145    26 - SPR 26 - SRR0 - pc
 146    1024 -> 2047         DCR 0 -> DCR 1023 (IBM PPC 4xx only)
 147    2048 -> 2079         R0 -> R31
 148    2080 -> 2143         FP0 -> FP31 (64 bit regs) (IBM PPC 5xx only)
 149    2144                 CR (known as cnd in GDB)
 150    2145                 FPCSR
 151    2146                 MSR (known as ps in GDB)
 152  */
 153
 154 static void
 155 bdm_ppc_fetch_registers (int regno)
 156 {
 157   struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch);
 158   int i;
 159   unsigned char *regs;
 160   int first_regno, last_regno;
 161   int first_bdm_regno, last_bdm_regno;
 162   int reglen;
 163
 164   if (regno == -1)
 165     {
 166       first_regno = 0;
 167       last_regno = NUM_REGS - 1;
 168
 169       first_bdm_regno = 0;
 170       last_bdm_regno = BDM_NUM_REGS - 1;
 171     }
 172   else
 173     {
 174       first_regno = regno;
 175       last_regno = regno;
 176
 177       first_bdm_regno = bdm_regmap[regno];
 178       last_bdm_regno = bdm_regmap[regno];
 179     }
 180
 181   if (first_bdm_regno == -1)
 182     {
 183       regcache_raw_supply (current_regcache, first_regno, NULL);
 184       return;                   /* Unsupported register */
 185     }
 186
 187   /* FIXME: jimb/2004-05-04: I'm not sure how to adapt this code to
 188      processors that lack floating point registers, and I don't have
 189      have the equipment to test it.  So we'll leave that case for the
 190      next person who encounters it.  */
 191   gdb_assert (ppc_floating_point_unit_p (current_gdbarch));
 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 == gdbarch_tdep (current_gdbarch)->ppc_mq_regnum)
 202           || (first_regno == gdbarch_tdep (current_gdbarch)->ppc_fpscr_regnum)
 203           || ((first_regno >= tdep->ppc_fp0_regnum)
 204               && (first_regno < tdep->ppc_fp0_regnum + ppc_num_fprs)))
 205         {
 206 /*          printf("invalid reg request!\n"); */
 207           regcache_raw_supply (current_regcache, first_regno, NULL);
 208           return;               /* Unsupported register */
 209         }
 210       else
 211         {
 212           regs = ocd_read_bdm_registers (first_bdm_regno,
 213                                          last_bdm_regno, &reglen);
 214         }
 215     }
 216   else
 217     internal_error (__FILE__, __LINE__,
 218                     _("ppc_bdm_fetch_registers: "
 219                     "'all registers' case not implemented"));
 220
 221 #endif
 222 #if 0
 223   regs = ocd_read_bdm_registers (first_bdm_regno, last_bdm_regno, &reglen);
 224 #endif
 225
 226   for (i = first_regno; i <= last_regno; i++)
 227     {
 228       int bdm_regno, regoffset;
 229
 230       bdm_regno = bdm_regmap[i];
 231       if (bdm_regno != -1)
 232         {
 233           regoffset = bdm_regno - first_bdm_regno;
 234
 235           if (regoffset >= reglen / 4)
 236             continue;
 237
 238           regcache_raw_supply (current_regcache, i, regs + 4 * regoffset);
 239         }
 240       else
 241         regcache_raw_supply (current_regcache, i, NULL);        /* Unsupported register */
 242     }
 243 }
 244
 245 /* Store register REGNO, or all registers if REGNO == -1, from the contents
 246    of REGISTERS.  FIXME: ignores errors.  */
 247
 248 static void
 249 bdm_ppc_store_registers (int regno)
 250 {
 251   struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch);
 252   int i;
 253   int first_regno, last_regno;
 254   int first_bdm_regno, last_bdm_regno;
 255
 256   if (regno == -1)
 257     {
 258       first_regno = 0;
 259       last_regno = NUM_REGS - 1;
 260
 261       first_bdm_regno = 0;
 262       last_bdm_regno = BDM_NUM_REGS - 1;
 263     }
 264   else
 265     {
 266       first_regno = regno;
 267       last_regno = regno;
 268
 269       first_bdm_regno = bdm_regmap[regno];
 270       last_bdm_regno = bdm_regmap[regno];
 271     }
 272
 273   if (first_bdm_regno == -1)
 274     return;                     /* Unsupported register */
 275
 276   /* FIXME: jimb/2004-05-04: I'm not sure how to adapt this code to
 277      processors that lack floating point registers, and I don't have
 278      have the equipment to test it.  So we'll leave that case for the
 279      next person who encounters it.  */
 280   gdb_assert (ppc_floating_point_unit_p (current_gdbarch));
 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 != gdbarch_tdep (current_gdbarch)->ppc_mq_regnum)
 291           && (i != gdbarch_tdep (current_gdbarch)->ppc_fpscr_regnum)
 292           && ((i < tdep->ppc_fp0_regnum)
 293               || (i >= tdep->ppc_fp0_regnum + ppc_num_fprs)))
 294         {
 295 /*          printf("write valid reg %d\n", bdm_regno); */
 296           ocd_write_bdm_registers (bdm_regno, deprecated_registers + DEPRECATED_REGISTER_BYTE (i), 4);
 297         }
 298 /*
 299    else if (i == gdbarch_tdep (current_gdbarch)->ppc_mq_regnum)
 300    printf("don't write invalid reg %d (PPC_MQ_REGNUM)\n", bdm_regno);
 301    else
 302    printf("don't write invalid reg %d\n", bdm_regno);
 303  */
 304     }
 305 }
 306 \f
 307 /* Define the target subroutine names */
 308
 309 struct target_ops bdm_ppc_ops;
 310
 311 static void
 312 init_bdm_ppc_ops (void)
 313 {
 314   bdm_ppc_ops.to_shortname = "ocd";
 315   bdm_ppc_ops.to_longname = "Remote target with On-Chip Debugging";
 316   bdm_ppc_ops.to_doc = "Use a remote target with On-Chip Debugging.  To use a target box;\n\
 317 specify the serial device it is connected to (e.g. /dev/ttya).  To use\n\
 318 a wiggler, specify wiggler and then the port it is connected to\n\
 319 (e.g. wiggler lpt1).";          /* to_doc */
 320   bdm_ppc_ops.to_open = bdm_ppc_open;
 321   bdm_ppc_ops.to_close = ocd_close;
 322   bdm_ppc_ops.to_detach = ocd_detach;
 323   bdm_ppc_ops.to_resume = ocd_resume;
 324   bdm_ppc_ops.to_wait = bdm_ppc_wait;
 325   bdm_ppc_ops.to_fetch_registers = bdm_ppc_fetch_registers;
 326   bdm_ppc_ops.to_store_registers = bdm_ppc_store_registers;
 327   bdm_ppc_ops.to_prepare_to_store = ocd_prepare_to_store;
 328   bdm_ppc_ops.deprecated_xfer_memory = ocd_xfer_memory;
 329   bdm_ppc_ops.to_files_info = ocd_files_info;
 330   bdm_ppc_ops.to_insert_breakpoint = ocd_insert_breakpoint;
 331   bdm_ppc_ops.to_remove_breakpoint = ocd_remove_breakpoint;
 332   bdm_ppc_ops.to_kill = ocd_kill;
 333   bdm_ppc_ops.to_load = ocd_load;
 334   bdm_ppc_ops.to_create_inferior = ocd_create_inferior;
 335   bdm_ppc_ops.to_mourn_inferior = ocd_mourn;
 336   bdm_ppc_ops.to_thread_alive = ocd_thread_alive;
 337   bdm_ppc_ops.to_stop = ocd_stop;
 338   bdm_ppc_ops.to_stratum = process_stratum;
 339   bdm_ppc_ops.to_has_all_memory = 1;
 340   bdm_ppc_ops.to_has_memory = 1;
 341   bdm_ppc_ops.to_has_stack = 1;
 342   bdm_ppc_ops.to_has_registers = 1;
 343   bdm_ppc_ops.to_has_execution = 1;
 344   bdm_ppc_ops.to_magic = OPS_MAGIC;
 345 }                               /* init_bdm_ppc_ops */
 346
 347 extern initialize_file_ftype _initialize_bdm_ppc; /* -Wmissing-prototypes */
 348
 349 void
 350 _initialize_bdm_ppc (void)
 351 {
 352   init_bdm_ppc_ops ();
 353   add_target (&bdm_ppc_ops);
 354 }