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/* Remote debugging interface for boot monitors, for GDB.

   Copyright 1990, 1991, 1992, 1993, 1994, 1995, 1996, 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.  */

/* This file was derived from remote-eb.c, which did a similar job, but for

   an AMD-29K running EBMON.  That file was in turn derived from remote.c

   as mentioned in the following comment (left in for comic relief):

   "This is like remote.c but is for a different situation--

   having a PC running os9000 hook up with a unix machine with

   a serial line, and running ctty com2 on the PC. os9000 has a debug

   monitor called ROMBUG running.  Not to mention that the PC

   has PC/NFS, so it can access the same executables that gdb can,

   over the net in real time."

   In reality, this module talks to a debug monitor called 'ROMBUG', which

   We communicate with ROMBUG via a direct serial line, the network version

   of ROMBUG is not available yet.

 */

/* FIXME This file needs to be rewritten if it's to work again, either

   to self-contained or to use the new monitor interface.  */

#include "defs.h"

#include "gdbcore.h"

#include "target.h"

#include "gdb_string.h"

#include <sys/types.h>

#include "command.h"

#include "serial.h"

#include "monitor.h"

#include "remote-utils.h"

#include "symtab.h"

#include "symfile.h"

#include "objfiles.h"

#include "gdb-stabs.h"

#include "regcache.h"

struct cmd_list_element *showlist;

extern struct target_ops rombug_ops;    /* Forward declaration */

extern struct monitor_ops rombug_cmds;  /* Forward declaration */

extern struct cmd_list_element *setlist;

extern struct cmd_list_element *unsetlist;

extern int attach_flag;

static void rombug_close ();

static void rombug_fetch_register ();

static void rombug_fetch_registers ();

static void rombug_store_register ();

#if 0

static int sr_get_debug ();     /* flag set by "set remotedebug" */

#endif

static int hashmark;            /* flag set by "set hash" */

static int rombug_is_open = 0;

/* FIXME: Replace with sr_get_debug ().  */

#define LOG_FILE "monitor.log"

FILE *log_file;

static int monitor_log = 0;

static int tty_xon = 0;

static int tty_xoff = 0;

static int timeout = 10;

static int is_trace_mode = 0;

/* Descriptor for I/O to remote machine.  Initialize it to NULL */

static serial_t monitor_desc = NULL;

static CORE_ADDR bufaddr = 0;

static int buflen = 0;

static char readbuf[16];

/* Send data to monitor.  Works just like printf. */

static void

printf_monitor (char *pattern,...)

{

  va_list args;

  char buf[200];

  int i;

  va_start (args, pattern);

  vsprintf (buf, pattern, args);

  va_end (args);

  if (SERIAL_WRITE (monitor_desc, buf, strlen (buf)))

    fprintf (stderr, "SERIAL_WRITE failed: %s\n", safe_strerror (errno));

}

/* Read a character from the remote system, doing all the fancy timeout stuff */

static int

readchar (int timeout)

{

  int c;

  c = SERIAL_READCHAR (monitor_desc, timeout);

  if (sr_get_debug ())

    putchar (c & 0x7f);

  if (monitor_log && isascii (c))

    putc (c & 0x7f, log_file);

  if (c >= 0)

    return c & 0x7f;

  if (c == SERIAL_TIMEOUT)

    {

      if (timeout == 0)

        return c;               /* Polls shouldn't generate timeout errors */

      error ("Timeout reading from remote system.");

    }

  perror_with_name ("remote-monitor");

}

/* Scan input from the remote system, until STRING is found.  If DISCARD is

   non-zero, then discard non-matching input, else print it out.

   Let the user break out immediately.  */

static void

expect (char *string, int discard)

{

  char *p = string;

  int c;

  if (sr_get_debug ())

    printf ("Expecting \"%s\"\n", string);

  immediate_quit++;

  while (1)

    {

      c = readchar (timeout);

      if (!isascii (c))

        continue;

      if (c == *p++)

        {

          if (*p == '\0')

            {

              immediate_quit--;

              if (sr_get_debug ())

                printf ("\nMatched\n");

              return;

            }

        }

      else

        {

          if (!discard)

            {

              fwrite (string, 1, (p - 1) - string, stdout);

              putchar ((char) c);

              fflush (stdout);

            }

          p = string;

        }

    }

}

/* Keep discarding input until we see the ROMBUG prompt.

   The convention for dealing with the prompt is that you

   o give your command

   o *then* wait for the prompt.

   Thus the last thing that a procedure does with the serial line

   will be an expect_prompt().  Exception:  rombug_resume does not

   wait for the prompt, because the terminal is being handed over

   to the inferior.  However, the next thing which happens after that

   is a rombug_wait which does wait for the prompt.

   Note that this includes abnormal exit, e.g. error().  This is

   necessary to prevent getting into states from which we can't

   recover.  */

static void

expect_prompt (int discard)

{

  if (monitor_log)

    /* This is a convenient place to do this.  The idea is to do it often

       enough that we never lose much data if we terminate abnormally.  */

    fflush (log_file);

  if (is_trace_mode)

    {

      expect ("trace", discard);

    }

  else

    {

      expect (PROMPT, discard);

    }

}

/* Get a hex digit from the remote system & return its value.

   If ignore_space is nonzero, ignore spaces (not newline, tab, etc).  */

static int

get_hex_digit (int ignore_space)

{

  int ch;

  while (1)

    {

      ch = readchar (timeout);

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

        return ch - '0';

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

        return ch - 'A' + 10;

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

        return ch - 'a' + 10;

      else if (ch == ' ' && ignore_space)

        ;

      else

        {

          expect_prompt (1);

          error ("Invalid hex digit from remote system.");

        }

    }

}

/* Get a byte from monitor and put it in *BYT.  Accept any number

   leading spaces.  */

static void

get_hex_byte (char *byt)

{

  int val;

  val = get_hex_digit (1) << 4;

  val |= get_hex_digit (0);

  *byt = val;

}

/* Get N 32-bit words from remote, each preceded by a space,

   and put them in registers starting at REGNO.  */

static void

get_hex_regs (int n, int regno)

{

  long val;

  int i;

  unsigned char b;

  for (i = 0; i < n; i++)

    {

      int j;

      val = 0;

      for (j = 0; j < 4; j++)

        {

          get_hex_byte (&b);

          if (TARGET_BYTE_ORDER == BIG_ENDIAN)

            val = (val << 8) + b;

          else

            val = val + (b << (j * 8));

        }

      supply_register (regno++, (char *) &val);

    }

}

/* This is called not only when we first attach, but also when the

   user types "run" after having attached.  */

static void

rombug_create_inferior (char *execfile, char *args, char **env)

{

  int entry_pt;

  if (args && *args)

    error ("Can't pass arguments to remote ROMBUG process");

  if (execfile == 0 || exec_bfd == 0)

    error ("No executable file specified");

  entry_pt = (int) bfd_get_start_address (exec_bfd);

  if (monitor_log)

    fputs ("\nIn Create_inferior()", log_file);

/* The "process" (board) is already stopped awaiting our commands, and

   the program is already downloaded.  We just set its PC and go.  */

  init_wait_for_inferior ();

  proceed ((CORE_ADDR) entry_pt, TARGET_SIGNAL_DEFAULT, 0);

}

/* Open a connection to a remote debugger.

   NAME is the filename used for communication.  */

static char dev_name[100];

static void

rombug_open (char *args, int from_tty)

{

  if (args == NULL)

    error ("Use `target RomBug DEVICE-NAME' to use a serial port, or \n\

`target RomBug HOST-NAME:PORT-NUMBER' to use a network connection.");

  target_preopen (from_tty);

  if (rombug_is_open)

    unpush_target (&rombug_ops);

  strcpy (dev_name, args);

  monitor_desc = SERIAL_OPEN (dev_name);

  if (monitor_desc == NULL)

    perror_with_name (dev_name);

  /* if baud rate is set by 'set remotebaud' */

  if (SERIAL_SETBAUDRATE (monitor_desc, sr_get_baud_rate ()))

    {

      SERIAL_CLOSE (monitor_desc);

      perror_with_name ("RomBug");

    }

  SERIAL_RAW (monitor_desc);

  if (tty_xon || tty_xoff)

    {

      struct hardware_ttystate

        {

          struct termios t;

        }

       *tty_s;

      tty_s = (struct hardware_ttystate *) SERIAL_GET_TTY_STATE (monitor_desc);

      if (tty_xon)

        tty_s->t.c_iflag |= IXON;

      if (tty_xoff)

        tty_s->t.c_iflag |= IXOFF;

      SERIAL_SET_TTY_STATE (monitor_desc, (serial_ttystate) tty_s);

    }

  rombug_is_open = 1;

  log_file = fopen (LOG_FILE, "w");

  if (log_file == NULL)

    perror_with_name (LOG_FILE);

  push_monitor (&rombug_cmds);

  printf_monitor ("\r");        /* CR wakes up monitor */

  expect_prompt (1);

  push_target (&rombug_ops);

  attach_flag = 1;

  if (from_tty)

    printf ("Remote %s connected to %s\n", target_shortname,

            dev_name);

  rombug_fetch_registers ();

  printf_monitor ("ov e \r");

  expect_prompt (1);

  bufaddr = 0;

  buflen = 0;

}

/*

 * Close out all files and local state before this target loses control.

 */

static void

rombug_close (int quitting)

{

  if (rombug_is_open)

    {

      SERIAL_CLOSE (monitor_desc);

      monitor_desc = NULL;

      rombug_is_open = 0;

    }

  if (log_file)

    {

      if (ferror (log_file))

        fprintf (stderr, "Error writing log file.\n");

      if (fclose (log_file) != 0)

        fprintf (stderr, "Error closing log file.\n");

      log_file = 0;

    }

}

int

rombug_link (char *mod_name, CORE_ADDR *text_reloc)

{

  int i, j;

  unsigned long val;

  unsigned char b;

  printf_monitor ("l %s \r", mod_name);

  expect_prompt (1);

  printf_monitor (".r \r");

  expect (REG_DELIM, 1);

  for (i = 0; i <= 7; i++)

    {

      val = 0;

      for (j = 0; j < 4; j++)

        {

          get_hex_byte (&b);

          val = (val << 8) + b;

        }

    }

  expect_prompt (1);

  *text_reloc = val;

  return 1;

}

/* Terminate the open connection to the remote debugger.

   Use this when you want to detach and do something else

   with your gdb.  */

static void

rombug_detach (int from_tty)

{

  if (attach_flag)

    {

      printf_monitor (GO_CMD);

      attach_flag = 0;

    }

  pop_target ();                /* calls rombug_close to do the real work */

  if (from_tty)

    printf ("Ending remote %s debugging\n", target_shortname);

}

/*

 * Tell the remote machine to resume.

 */

static void

rombug_resume (ptid_t ptid, int step, enum target_signal sig)

{

  if (monitor_log)

    fprintf (log_file, "\nIn Resume (step=%d, sig=%d)\n", step, sig);

  if (step)

    {

      is_trace_mode = 1;

      printf_monitor (STEP_CMD);

      /* wait for the echo.  **

         expect (STEP_CMD, 1);

       */

    }

  else

    {

      printf_monitor (GO_CMD);

      /* swallow the echo.  **

         expect (GO_CMD, 1);

       */

    }

  bufaddr = 0;

  buflen = 0;

}

/*

 * Wait until the remote machine stops, then return,

 * storing status in status just as `wait' would.

 */

static ptid *

rombug_wait (ptid_t ptid, struct target_waitstatus *status)

{

  int old_timeout = timeout;

  struct section_offsets *offs;

  CORE_ADDR addr, pc;

  struct obj_section *obj_sec;

  if (monitor_log)

    fputs ("\nIn wait ()", log_file);

  status->kind = TARGET_WAITKIND_EXITED;

  status->value.integer = 0;

  timeout = -1;                 /* Don't time out -- user program is running. */

  expect ("eax:", 0);            /* output any message before register display */

  expect_prompt (1);            /* Wait for prompt, outputting extraneous text */

  status->kind = TARGET_WAITKIND_STOPPED;

  status->value.sig = TARGET_SIGNAL_TRAP;

  timeout = old_timeout;

  rombug_fetch_registers ();

  bufaddr = 0;

  buflen = 0;

  pc = read_register (PC_REGNUM);

  addr = read_register (DATABASE_REG);

  obj_sec = find_pc_section (pc);

  if (obj_sec != NULL)

    {

      if (obj_sec->objfile != symfile_objfile)

        new_symfile_objfile (obj_sec->objfile, 1, 0);

      offs = (struct section_offsets *) alloca (SIZEOF_SECTION_OFFSETS);

      memcpy (offs, symfile_objfile->section_offsets, SIZEOF_SECTION_OFFSETS);

      offs->offsets[SECT_OFF_DATA (symfile_objfile)]  = addr;

      offs->offsets[SECT_OFF_BSS (symfile_objfile)]  = addr;

      objfile_relocate (symfile_objfile, offs);

    }

  return inferior_ptid;

}

/* Return the name of register number regno in the form input and output by

   monitor.  Currently, register_names just happens to contain exactly what

   monitor wants.  Lets take advantage of that just as long as possible! */

static char *

get_reg_name (int regno)

{

  static char buf[50];

  char *p;

  char *b;

  b = buf;

  if (regno < 0)

    return ("");

/*

   for (p = REGISTER_NAME (regno); *p; p++)

   *b++ = toupper(*p);

   *b = '\000';

 */

  p = (char *) REGISTER_NAME (regno);

  return p;

/*

   return buf;

 */

}

/* read the remote registers into the block regs.  */

static void

rombug_fetch_registers (void)

{

  int regno, j, i;

  long val;

  unsigned char b;

  printf_monitor (GET_REG);

  expect ("eax:", 1);

  expect ("\n", 1);

  get_hex_regs (1, 0);

  get_hex_regs (1, 3);

  get_hex_regs (1, 1);

  get_hex_regs (1, 2);

  get_hex_regs (1, 6);

  get_hex_regs (1, 7);

  get_hex_regs (1, 5);

  get_hex_regs (1, 4);

  for (regno = 8; regno <= 15; regno++)

    {

      expect (REG_DELIM, 1);

      if (regno >= 8 && regno <= 13)

        {

          val = 0;

          for (j = 0; j < 2; j++)

            {

              get_hex_byte (&b);

              if (TARGET_BYTE_ORDER == BIG_ENDIAN)

                val = (val << 8) + b;

              else

                val = val + (b << (j * 8));

            }

          if (regno == 8)

            i = 10;

          if (regno >= 9 && regno <= 12)

            i = regno + 3;

          if (regno == 13)

            i = 11;

          supply_register (i, (char *) &val);

        }

      else if (regno == 14)

        {

          get_hex_regs (1, PC_REGNUM);

        }

      else if (regno == 15)

        {

          get_hex_regs (1, 9);

        }

      else

        {

          val = 0;

          supply_register (regno, (char *) &val);

        }

    }

  is_trace_mode = 0;

  expect_prompt (1);

}

/* Fetch register REGNO, or all registers if REGNO is -1.

   Returns errno value.  */

static void

rombug_fetch_register (int regno)

{

  int val, j;

  unsigned char b;

  if (monitor_log)

    {

      fprintf (log_file, "\nIn Fetch Register (reg=%s)\n", get_reg_name (regno));

      fflush (log_file);

    }

  if (regno < 0)

    {

      rombug_fetch_registers ();

    }

  else

    {

      char *name = get_reg_name (regno);

      printf_monitor (GET_REG);

      if (regno >= 10 && regno <= 15)

        {

          expect ("\n", 1);

          expect ("\n", 1);

          expect (name, 1);

          expect (REG_DELIM, 1);

          val = 0;

          for (j = 0; j < 2; j++)

            {

              get_hex_byte (&b);

              if (TARGET_BYTE_ORDER == BIG_ENDIAN)

                val = (val << 8) + b;

              else

                val = val + (b << (j * 8));

            }

          supply_register (regno, (char *) &val);

        }

      else if (regno == 8 || regno == 9)

        {

          expect ("\n", 1);

          expect ("\n", 1);

          expect ("\n", 1);

          expect (name, 1);

          expect (REG_DELIM, 1);

          get_hex_regs (1, regno);

        }

      else

        {

          expect (name, 1);

          expect (REG_DELIM, 1);

          expect ("\n", 1);

          get_hex_regs (1, 0);

          get_hex_regs (1, 3);

          get_hex_regs (1, 1);

          get_hex_regs (1, 2);

          get_hex_regs (1, 6);

          get_hex_regs (1, 7);

          get_hex_regs (1, 5);

          get_hex_regs (1, 4);

        }

      expect_prompt (1);

    }

  return;

}

/* Store the remote registers from the contents of the block REGS.  */

static void

rombug_store_registers (void)

{

  int regno;

  for (regno = 0; regno <= PC_REGNUM; regno++)

    rombug_store_register (regno);

  registers_changed ();

}

/* Store register REGNO, or all if REGNO == 0.

   return errno value.  */

static void

rombug_store_register (int regno)

{

  char *name;

  if (monitor_log)

    fprintf (log_file, "\nIn Store_register (regno=%d)\n", regno);

  if (regno == -1)

    rombug_store_registers ();