/* Remote target glue for the ROM68K ROM monitor.
   Copyright (C) 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., 51 Franklin Street, Fifth Floor,
   Boston, MA 02110-1301, USA.  */

#include "defs.h"
#include "gdbcore.h"
#include "target.h"
#include "monitor.h"
#include "serial.h"
#include "regcache.h"
#include "value.h"

#include "m68k-tdep.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_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_size (current_gdbarch, regno), value);
  regcache_raw_supply (current_regcache, 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 = M68K_D0_REGNUM;
	numregs = 8;
	break;
      case 'A':
	if (regname[1] != 'R')
	  break;
	regno = M68K_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);
}

extern initialize_file_ftype _initialize_rom68k; /* -Wmissing-prototypes */

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);
}