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/* Remote target glue for the ROM68K ROM monitor.

   Copyright 1988, 1991, 1992, 1993, 1994, 1995, 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 "target.h"

#include "monitor.h"

#include "serial.h"

#include "regcache.h"

#include "value.h"

static void rom68k_open (char *args, int from_tty);

/* Return true if C is a hex digit.

   We can't use isxdigit here: that is affected by the current locale;

   ROM68K is not.  */

static int

is_hex_digit (int c)

{

  return (('0' <= c && c <= '9')

          || ('a' <= c && c <= 'f')

          || ('A' <= c && c <= 'F'));

}

/* Convert hex digit A to a number.  */

static int

hex_digit_value (int a)

{

  if (a >= '0' && a <= '9')

    return a - '0';

  else if (a >= 'a' && a <= 'f')

    return a - 'a' + 10;

  else if (a >= 'A' && a <= 'F')

    return a - 'A' + 10;

  else

    error ("Invalid hex digit %d", a);

}

/* Return true iff C is a whitespace character.

   We can't use isspace here: that is affected by the current locale;

   ROM68K is not.  */

static int

is_whitespace (int c)

{

  return (c == ' '

          || c == '\r'

          || c == '\n'

          || c == '\t'

          || c == '\f');

}

/* Parse a string of hex digits starting at HEX, supply them as the

   value of register REGNO, skip any whitespace, and return a pointer

   to the next character.

   There is a function in monitor.c, monitor_supply_register, which is

   supposed to do this job.  However, there is some rather odd stuff

   in there (whitespace characters don't terminate numbers, for

   example) that is incorrect for ROM68k.  It's basically impossible

   to safely tweak monitor_supply_register --- it's used by a zillion

   other monitors; who knows what behaviors they're depending on.  So

   instead, we'll just use our own function, which can behave exactly

   the way we want it to.  */

static char *

rom68k_supply_one_register (int regno, unsigned char *hex)

{

  ULONGEST value;

  unsigned char regbuf[MAX_REGISTER_RAW_SIZE];

  value = 0;

  while (*hex != '\0')

    if (is_hex_digit (*hex))

      value = (value * 16) + hex_digit_value (*hex++);

    else

      break;

  /* Skip any whitespace.  */

  while (is_whitespace (*hex))

    hex++;

  store_unsigned_integer (regbuf, REGISTER_RAW_SIZE (regno), value);

  supply_register (regno, regbuf);

  return hex;

}

static void

rom68k_supply_register (char *regname, int regnamelen, char *val, int vallen)

{

  int numregs;

  int regno;

  numregs = 1;

  regno = -1;

  if (regnamelen == 2)

    switch (regname[0])

      {

      case 'S':

        if (regname[1] == 'R')

          regno = PS_REGNUM;

        break;

      case 'P':

        if (regname[1] == 'C')

          regno = PC_REGNUM;

        break;

      case 'D':

        if (regname[1] != 'R')

          break;

        regno = D0_REGNUM;

        numregs = 8;

        break;

      case 'A':

        if (regname[1] != 'R')

          break;

        regno = A0_REGNUM;

        numregs = 7;

        break;

      }

  else if (regnamelen == 3)

    switch (regname[0])

      {

      case 'I':

        if (regname[1] == 'S' && regname[2] == 'P')

          regno = SP_REGNUM;

      }

  if (regno >= 0)

    while (numregs-- > 0)

      val = rom68k_supply_one_register (regno++, val);

}

/* This array of registers need to match the indexes used by GDB.

   This exists because the various ROM monitors use different strings

   than does GDB, and don't necessarily support all the registers

   either. So, typing "info reg sp" becomes a "r30".  */

static const char *

rom68k_regname (int index)

{

  static char *regnames[] =

  {

    "D0", "D1", "D2", "D3", "D4", "D5", "D6", "D7",

    "A0", "A1", "A2", "A3", "A4", "A5", "A6", "ISP",

    "SR", "PC"

  };

  if ((index >= (sizeof (regnames) / sizeof(regnames[0])))

       || (index < 0) || (index >= NUM_REGS))

    return NULL;

  else

    return regnames[index];

}

/* Define the monitor command strings. Since these are passed directly

   through to a printf style function, we may include formatting

   strings. We also need a CR or LF on the end.  */

static struct target_ops rom68k_ops;

static char *rom68k_inits[] =

{".\r\r", NULL};                /* Exits pm/pr & download cmds */

static struct monitor_ops rom68k_cmds;

static void

init_rom68k_cmds (void)

{

  rom68k_cmds.flags = MO_PRINT_PROGRAM_OUTPUT;

  rom68k_cmds.init = rom68k_inits;      /* monitor init string */

  rom68k_cmds.cont = "go\r";

  rom68k_cmds.step = "st\r";

  rom68k_cmds.stop = NULL;

  rom68k_cmds.set_break = "db %x\r";

  rom68k_cmds.clr_break = "cb %x\r";

  rom68k_cmds.clr_all_break = "cb *\r";

  rom68k_cmds.fill = "fm %x %x %x\r";

  rom68k_cmds.setmem.cmdb = "pm %x %x\r";

  rom68k_cmds.setmem.cmdw = "pm.w %x %x\r";

  rom68k_cmds.setmem.cmdl = "pm.l %x %x\r";

  rom68k_cmds.setmem.cmdll = NULL;

  rom68k_cmds.setmem.resp_delim = NULL;

  rom68k_cmds.setmem.term = NULL;

  rom68k_cmds.setmem.term_cmd = NULL;

  rom68k_cmds.getmem.cmdb = "dm %x %x\r";

  rom68k_cmds.getmem.cmdw = "dm.w %x %x\r";

  rom68k_cmds.getmem.cmdl = "dm.l %x %x\r";

  rom68k_cmds.getmem.cmdll = NULL;

  rom68k_cmds.getmem.resp_delim = "  ";

  rom68k_cmds.getmem.term = NULL;

  rom68k_cmds.getmem.term_cmd = NULL;

  rom68k_cmds.setreg.cmd = "pr %s %x\r";

  rom68k_cmds.setreg.resp_delim = NULL;

  rom68k_cmds.setreg.term = NULL;

  rom68k_cmds.setreg.term_cmd = NULL;

  rom68k_cmds.getreg.cmd = "pr %s\r";

  rom68k_cmds.getreg.resp_delim = ":  ";

  rom68k_cmds.getreg.term = "= ";

  rom68k_cmds.getreg.term_cmd = ".\r";

  rom68k_cmds.dump_registers = "dr\r";

  rom68k_cmds.register_pattern =

    "\\(\\w+\\)=\\([0-9a-fA-F]+\\( +[0-9a-fA-F]+\\b\\)*\\)";

  rom68k_cmds.supply_register = rom68k_supply_register;

  rom68k_cmds.load_routine = NULL;

  rom68k_cmds.load = "dc\r";

  rom68k_cmds.loadresp = "Waiting for S-records from host... ";

  rom68k_cmds.prompt = "ROM68K :-> ";

  rom68k_cmds.line_term = "\r";

  rom68k_cmds.cmd_end = ".\r";

  rom68k_cmds.target = &rom68k_ops;

  rom68k_cmds.stopbits = SERIAL_1_STOPBITS;

  rom68k_cmds.regnames = NULL;

  rom68k_cmds.regname = rom68k_regname;

  rom68k_cmds.magic = MONITOR_OPS_MAGIC;

}                               /* init_rom68k_cmds */

static void

rom68k_open (char *args, int from_tty)

{

  monitor_open (args, &rom68k_cmds, from_tty);

}

void

_initialize_rom68k (void)

{

  init_rom68k_cmds ();

  init_monitor_ops (&rom68k_ops);

  rom68k_ops.to_shortname = "rom68k";

  rom68k_ops.to_longname = "Rom68k debug monitor for the IDP Eval board";

  rom68k_ops.to_doc = "Debug on a Motorola IDP eval board running the ROM68K monitor.\n\

Specify the serial device it is connected to (e.g. /dev/ttya).";

  rom68k_ops.to_open = rom68k_open;

  add_target (&rom68k_ops);

}