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/* Remote target communications for the Macraigor Systems BDM Wiggler

   talking to a Motorola PPC 8xx ADS board

   Copyright 1996, 1997, 1998, 1999, 2000, 2001

   Free Software Foundation, Inc.

   This file is part of GDB.

   This program is free software; you can redistribute it and/or modify

   it under the terms of the GNU General Public License as published by

   the Free Software Foundation; either version 2 of the License, or

   (at your option) any later version.

   This program is distributed in the hope that it will be useful,

   but WITHOUT ANY WARRANTY; without even the implied warranty of

   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License

   along with this program; if not, write to the Free Software

   Foundation, Inc., 59 Temple Place - Suite 330,

   Boston, MA 02111-1307, USA.  */

#include "defs.h"

#include "gdbcore.h"

#include "gdb_string.h"

#include <fcntl.h>

#include "frame.h"

#include "inferior.h"

#include "bfd.h"

#include "symfile.h"

#include "target.h"

#include "gdbcmd.h"

#include "objfiles.h"

#include "gdb-stabs.h"

#include <sys/types.h>

#include "serial.h"

#include "ocd.h"

#include "ppc-tdep.h"

#include "regcache.h"

static void bdm_ppc_open (char *name, int from_tty);

static ptid_t bdm_ppc_wait (ptid_t ptid,

                            struct target_waitstatus *target_status);

static void bdm_ppc_fetch_registers (int regno);

static void bdm_ppc_store_registers (int regno);

extern struct target_ops bdm_ppc_ops;   /* Forward decl */

/*#define BDM_NUM_REGS 71 */

#define BDM_NUM_REGS 24

#define BDM_REGMAP \

        2048, 2049, 2050, 2051, 2052, 2053, 2054, 2055, /* r0-r7 */ \

        2056, 2057, 2058, 2059, 2060, 2061, 2062, 2063, /* r8-r15 */ \

        2064, 2065, 2066, 2067, 2068, 2069, 2070, 2071, /* r16-r23 */ \

        2072, 2073, 2074, 2075, 2076, 2077, 2078, 2079, /* r24-r31 */ \

\

        2080, 2082, 2084, 2086, 2088, 2090, 2092, 2094, /* fp0->fp8 */ \

        2096, 2098, 2100, 2102, 2104, 2106, 2108, 2110, /* fp0->fp8 */ \

        2112, 2114, 2116, 2118, 2120, 2122, 2124, 2126, /* fp0->fp8 */ \

        2128, 2130, 2132, 2134, 2136, 2138, 2140, 2142, /* fp0->fp8 */ \

\

        26,        /* pc (SRR0 (SPR 26)) */ \

        2146,      /* ps (MSR) */ \

        2144,      /* cnd (CR) */ \

        8,         /* lr (SPR 8) */ \

        9,         /* cnt (CTR (SPR 9)) */ \

        1,         /* xer (SPR 1) */ \

        0,                       /* mq (SPR 0) */

char nowatchdog[4] =

{0xff, 0xff, 0xff, 0x88};

/* Open a connection to a remote debugger.

   NAME is the filename used for communication.  */

static void

bdm_ppc_open (char *name, int from_tty)

{

  CORE_ADDR watchdogaddr = 0xff000004;

  ocd_open (name, from_tty, OCD_TARGET_MOTO_PPC, &bdm_ppc_ops);

  /* We want interrupts to drop us into debugging mode. */

  /* Modify the DER register to accomplish this. */

  ocd_write_bdm_register (149, 0x20024000);

  /* Disable watchdog timer on the board */

  ocd_write_bytes (watchdogaddr, nowatchdog, 4);

}

/* Wait until the remote machine stops, then return,

   storing status in STATUS just as `wait' would.

   Returns "pid" (though it's not clear what, if anything, that

   means in the case of this target).  */

static ptid_t

bdm_ppc_wait (ptid_t ptid, struct target_waitstatus *target_status)

{

  int stop_reason;

  target_status->kind = TARGET_WAITKIND_STOPPED;

  stop_reason = ocd_wait ();

  if (stop_reason)

    {

      target_status->value.sig = TARGET_SIGNAL_INT;

      return inferior_ptid;

    }

  target_status->value.sig = TARGET_SIGNAL_TRAP;        /* XXX for now */

#if 0

  {

    unsigned long ecr, der;

    ecr = ocd_read_bdm_register (148);  /* Read the exception cause register */

    der = ocd_read_bdm_register (149);  /* Read the debug enables register */

    fprintf_unfiltered (gdb_stdout, "ecr = 0x%x, der = 0x%x\n", ecr, der);

  }

#endif

  return inferior_ptid;

}

static int bdm_regmap[] =

{BDM_REGMAP};

/* Read the remote registers into regs.

   Fetch register REGNO, or all registers if REGNO == -1

   The Wiggler uses the following codes to access the registers:

   1 - SPR 1 - XER

   8 - SPR 8 - LR

   9 - SPR 9 - CTR (known as cnt in GDB)

   26 - SPR 26 - SRR0 - pc

   1024 -> 2047         DCR 0 -> DCR 1023 (IBM PPC 4xx only)

   2048 -> 2079         R0 -> R31

   2080 -> 2143         FP0 -> FP31 (64 bit regs) (IBM PPC 5xx only)

   2144                 CR (known as cnd in GDB)

   2145                 FPCSR

   2146                 MSR (known as ps in GDB)

 */

static void

bdm_ppc_fetch_registers (int regno)

{

  int i;

  unsigned char *regs, *beginregs, *endregs, *almostregs;

  unsigned char midregs[32];

  unsigned char mqreg[1];

  int first_regno, last_regno;

  int first_bdm_regno, last_bdm_regno;

  int reglen, beginreglen, endreglen;

#if 1

  for (i = 0; i < (FPLAST_REGNUM - FP0_REGNUM + 1); i++)

    {

      midregs[i] = -1;

    }

  mqreg[0] = -1;

#endif

  if (regno == -1)

    {

      first_regno = 0;

      last_regno = NUM_REGS - 1;

      first_bdm_regno = 0;

      last_bdm_regno = BDM_NUM_REGS - 1;

    }

  else

    {

      first_regno = regno;

      last_regno = regno;

      first_bdm_regno = bdm_regmap[regno];

      last_bdm_regno = bdm_regmap[regno];

    }

  if (first_bdm_regno == -1)

    {

      supply_register (first_regno, NULL);

      return;                   /* Unsupported register */

    }

#if 1

  /* Can't ask for floating point regs on ppc 8xx, also need to

     avoid asking for the mq register. */

  if (first_regno == last_regno)        /* only want one reg */

    {

/*      printf("Asking for register %d\n", first_regno); */

      /* if asking for an invalid register */

      if ((first_regno == gdbarch_tdep (current_gdbarch)->ppc_mq_regnum)

          || (first_regno == gdbarch_tdep (current_gdbarch)->ppc_fpscr_regnum)

          || ((first_regno >= FP0_REGNUM) && (first_regno <= FPLAST_REGNUM)))

        {

/*          printf("invalid reg request!\n"); */

          supply_register (first_regno, NULL);

          return;               /* Unsupported register */

        }

      else

        {

          regs = ocd_read_bdm_registers (first_bdm_regno,

                                         last_bdm_regno, &reglen);

        }

    }

  else

    /* want all regs */

    {

/*      printf("Asking for registers %d to %d\n", first_regno, last_regno); */

      beginregs = ocd_read_bdm_registers (first_bdm_regno,

                                          FP0_REGNUM - 1, &beginreglen);

      endregs = (strcat (midregs,

                         ocd_read_bdm_registers (FPLAST_REGNUM + 1,

                                          last_bdm_regno - 1, &endreglen)));

      almostregs = (strcat (beginregs, endregs));

      regs = (strcat (almostregs, mqreg));

      reglen = beginreglen + 32 + endreglen + 1;

    }

#endif

#if 0

  regs = ocd_read_bdm_registers (first_bdm_regno, last_bdm_regno, &reglen);

#endif

  for (i = first_regno; i <= last_regno; i++)

    {

      int bdm_regno, regoffset;

      bdm_regno = bdm_regmap[i];

      if (bdm_regno != -1)

        {

          regoffset = bdm_regno - first_bdm_regno;

          if (regoffset >= reglen / 4)

            continue;

          supply_register (i, regs + 4 * regoffset);

        }

      else

        supply_register (i, NULL);      /* Unsupported register */

    }

}

/* Store register REGNO, or all registers if REGNO == -1, from the contents

   of REGISTERS.  FIXME: ignores errors.  */

static void

bdm_ppc_store_registers (int regno)

{

  int i;

  int first_regno, last_regno;

  int first_bdm_regno, last_bdm_regno;

  if (regno == -1)

    {

      first_regno = 0;

      last_regno = NUM_REGS - 1;

      first_bdm_regno = 0;

      last_bdm_regno = BDM_NUM_REGS - 1;

    }

  else

    {

      first_regno = regno;

      last_regno = regno;

      first_bdm_regno = bdm_regmap[regno];

      last_bdm_regno = bdm_regmap[regno];

    }

  if (first_bdm_regno == -1)

    return;                     /* Unsupported register */

  for (i = first_regno; i <= last_regno; i++)

    {

      int bdm_regno;

      bdm_regno = bdm_regmap[i];

      /* only attempt to write if it's a valid ppc 8xx register */

      /* (need to avoid FP regs and MQ reg) */

      if ((i != gdbarch_tdep (current_gdbarch)->ppc_mq_regnum)

          && (i != gdbarch_tdep (current_gdbarch)->ppc_fpscr_regnum)

          && ((i < FP0_REGNUM) || (i > FPLAST_REGNUM)))

        {

/*          printf("write valid reg %d\n", bdm_regno); */

          ocd_write_bdm_registers (bdm_regno, registers + REGISTER_BYTE (i), 4);

        }

/*

   else if (i == gdbarch_tdep (current_gdbarch)->ppc_mq_regnum)

   printf("don't write invalid reg %d (PPC_MQ_REGNUM)\n", bdm_regno);

   else

   printf("don't write invalid reg %d\n", bdm_regno);

 */

    }

}

/* Define the target subroutine names */

struct target_ops bdm_ppc_ops;

static void

init_bdm_ppc_ops (void)

{

  bdm_ppc_ops.to_shortname = "ocd";

  bdm_ppc_ops.to_longname = "Remote target with On-Chip Debugging";

  bdm_ppc_ops.to_doc = "Use a remote target with On-Chip Debugging.  To use a target box;\n\

specify the serial device it is connected to (e.g. /dev/ttya).  To use\n\

a wiggler, specify wiggler and then the port it is connected to\n\

(e.g. wiggler lpt1).";          /* to_doc */

  bdm_ppc_ops.to_open = bdm_ppc_open;

  bdm_ppc_ops.to_close = ocd_close;

  bdm_ppc_ops.to_attach = NULL;

  bdm_ppc_ops.to_post_attach = NULL;

  bdm_ppc_ops.to_require_attach = NULL;

  bdm_ppc_ops.to_detach = ocd_detach;

  bdm_ppc_ops.to_require_detach = NULL;

  bdm_ppc_ops.to_resume = ocd_resume;

  bdm_ppc_ops.to_wait = bdm_ppc_wait;

  bdm_ppc_ops.to_post_wait = NULL;

  bdm_ppc_ops.to_fetch_registers = bdm_ppc_fetch_registers;

  bdm_ppc_ops.to_store_registers = bdm_ppc_store_registers;

  bdm_ppc_ops.to_prepare_to_store = ocd_prepare_to_store;

  bdm_ppc_ops.to_xfer_memory = ocd_xfer_memory;

  bdm_ppc_ops.to_files_info = ocd_files_info;

  bdm_ppc_ops.to_insert_breakpoint = ocd_insert_breakpoint;

  bdm_ppc_ops.to_remove_breakpoint = ocd_remove_breakpoint;

  bdm_ppc_ops.to_terminal_init = NULL;

  bdm_ppc_ops.to_terminal_inferior = NULL;

  bdm_ppc_ops.to_terminal_ours_for_output = NULL;

  bdm_ppc_ops.to_terminal_ours = NULL;

  bdm_ppc_ops.to_terminal_info = NULL;

  bdm_ppc_ops.to_kill = ocd_kill;

  bdm_ppc_ops.to_load = ocd_load;

  bdm_ppc_ops.to_lookup_symbol = NULL;

  bdm_ppc_ops.to_create_inferior = ocd_create_inferior;

  bdm_ppc_ops.to_post_startup_inferior = NULL;

  bdm_ppc_ops.to_acknowledge_created_inferior = NULL;

  bdm_ppc_ops.to_clone_and_follow_inferior = NULL;

  bdm_ppc_ops.to_post_follow_inferior_by_clone = NULL;

  bdm_ppc_ops.to_insert_fork_catchpoint = NULL;

  bdm_ppc_ops.to_remove_fork_catchpoint = NULL;

  bdm_ppc_ops.to_insert_vfork_catchpoint = NULL;

  bdm_ppc_ops.to_remove_vfork_catchpoint = NULL;

  bdm_ppc_ops.to_has_forked = NULL;

  bdm_ppc_ops.to_has_vforked = NULL;

  bdm_ppc_ops.to_can_follow_vfork_prior_to_exec = NULL;

  bdm_ppc_ops.to_post_follow_vfork = NULL;

  bdm_ppc_ops.to_insert_exec_catchpoint = NULL;

  bdm_ppc_ops.to_remove_exec_catchpoint = NULL;

  bdm_ppc_ops.to_has_execd = NULL;

  bdm_ppc_ops.to_reported_exec_events_per_exec_call = NULL;

  bdm_ppc_ops.to_has_exited = NULL;

  bdm_ppc_ops.to_mourn_inferior = ocd_mourn;

  bdm_ppc_ops.to_can_run = 0;

  bdm_ppc_ops.to_notice_signals = 0;

  bdm_ppc_ops.to_thread_alive = ocd_thread_alive;

  bdm_ppc_ops.to_stop = ocd_stop;

  bdm_ppc_ops.to_pid_to_exec_file = NULL;

  bdm_ppc_ops.to_stratum = process_stratum;

  bdm_ppc_ops.DONT_USE = NULL;

  bdm_ppc_ops.to_has_all_memory = 1;

  bdm_ppc_ops.to_has_memory = 1;

  bdm_ppc_ops.to_has_stack = 1;

  bdm_ppc_ops.to_has_registers = 1;

  bdm_ppc_ops.to_has_execution = 1;

  bdm_ppc_ops.to_sections = NULL;

  bdm_ppc_ops.to_sections_end = NULL;

  bdm_ppc_ops.to_magic = OPS_MAGIC;

}                               /* init_bdm_ppc_ops */

void

_initialize_bdm_ppc (void)

{

  init_bdm_ppc_ops ();

  add_target (&bdm_ppc_ops);

}