/* Target dependent code for the Fujitsu SPARClite for GDB, the GNU debugger.
   Copyright 1994, 1995  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., 675 Mass Ave, Cambridge, MA 02139, USA.  */

#include "defs.h"
#include "gdbcore.h"
#include "breakpoint.h"
#include "target.h"
#include "serial.h"
#include <sys/types.h>
#include <sys/time.h>
#ifndef __GO32__
#include <unistd.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netdb.h>
#endif

extern struct target_ops sparclite_ops;	/* Forward decl */
extern struct target_ops remote_ops;

static char *remote_target_name = NULL;
static serial_t remote_desc = NULL;
static int serial_flag;
#ifndef __GO32__
static int udp_fd = -1;
#endif

static serial_t open_tty PARAMS ((char *name));
static int send_resp PARAMS ((serial_t desc, char c));
static void close_tty PARAMS ((int ignore));
#ifndef __GO32__
static int recv_udp_buf PARAMS ((int fd, unsigned char *buf, int len, int timeout));
static int send_udp_buf PARAMS ((int fd, unsigned char *buf, int len));
#endif
static void sparclite_open PARAMS ((char *name, int from_tty));
static void sparclite_close PARAMS ((int quitting));
static void download PARAMS ((char *target_name, char *args, int from_tty,
			      void (*write_routine) (bfd *from_bfd,
						     asection *from_sec,
						     file_ptr from_addr,
						     bfd_vma to_addr, int len),
			      void (*start_routine) (bfd_vma entry)));
static void sparclite_serial_start PARAMS ((bfd_vma entry));
static void sparclite_serial_write PARAMS ((bfd *from_bfd, asection *from_sec,
					    file_ptr from_addr,
					    bfd_vma to_addr, int len));
#ifndef __GO32__
static unsigned short calc_checksum PARAMS ((unsigned char *buffer,
					     int count));
static void sparclite_udp_start PARAMS ((bfd_vma entry));
static void sparclite_udp_write PARAMS ((bfd *from_bfd, asection *from_sec,
					 file_ptr from_addr, bfd_vma to_addr,
					 int len));
#endif
static void sparclite_download PARAMS ((char *filename, int from_tty));

#define DDA2_SUP_ASI		0xb000000
#define DDA1_SUP_ASI		0xb0000

#define DDA2_ASI_MASK 		0xff000000
#define DDA1_ASI_MASK 		0xff0000 
#define DIA2_SUP_MODE 		0x8000
#define DIA1_SUP_MODE 		0x4000
#define DDA2_ENABLE 		0x100
#define DDA1_ENABLE 		0x80
#define DIA2_ENABLE 		0x40
#define DIA1_ENABLE 		0x20
#define DSINGLE_STEP 		0x10
#define DDV_TYPE_MASK 		0xc
#define DDV_TYPE_LOAD 		0x0
#define DDV_TYPE_STORE 		0x4
#define DDV_TYPE_ACCESS 	0x8
#define DDV_TYPE_ALWAYS		0xc
#define DDV_COND		0x2
#define DDV_MASK		0x1

int
sparclite_insert_watchpoint (addr, len, type)
     CORE_ADDR addr;
     int len;
     int type;
{
  CORE_ADDR dcr;

  dcr = read_register (DCR_REGNUM);

  if (!(dcr & DDA1_ENABLE))
    {
      write_register (DDA1_REGNUM, addr);
      dcr &= ~(DDA1_ASI_MASK | DDV_TYPE_MASK);
      dcr |= (DDA1_SUP_ASI | DDA1_ENABLE);
      if (type == 1)
	{
	  write_register (DDV1_REGNUM, 0);
	  write_register (DDV2_REGNUM, 0xffffffff);
	  dcr |= (DDV_TYPE_LOAD & (~DDV_COND & ~DDV_MASK));
	}   
      else if (type == 0)
	{
	  write_register (DDV1_REGNUM, 0);
	  write_register (DDV2_REGNUM, 0xffffffff);
	  dcr |= (DDV_TYPE_STORE & (~DDV_COND & ~DDV_MASK));
	}
      else
	{
	  write_register (DDV1_REGNUM, 0);
	  write_register (DDV2_REGNUM, 0xffffffff);
	  dcr |= (DDV_TYPE_ACCESS);
	}
      write_register (DCR_REGNUM, dcr);
    }
  else if (!(dcr & DDA2_ENABLE))
    {
      write_register (DDA2_REGNUM, addr);
      dcr &= ~(DDA2_ASI_MASK & DDV_TYPE_MASK);
      dcr |= (DDA2_SUP_ASI | DDA2_ENABLE);
      if (type == 1)
	{
	  write_register (DDV1_REGNUM, 0);
	  write_register (DDV2_REGNUM, 0xffffffff);
	  dcr |= (DDV_TYPE_LOAD & ~DDV_COND & ~DDV_MASK);
	}
      else if (type == 0)
	{
	  write_register (DDV1_REGNUM, 0);
	  write_register (DDV2_REGNUM, 0xffffffff);
	  dcr |= (DDV_TYPE_STORE & ~DDV_COND & ~DDV_MASK);
	}
      else
	{
	  write_register (DDV1_REGNUM, 0);
	  write_register (DDV2_REGNUM, 0xffffffff);
	  dcr |= (DDV_TYPE_ACCESS);
	}
      write_register (DCR_REGNUM, dcr);
    }
  else
    return -1;

  return 0;
} 

int
sparclite_remove_watchpoint (addr, len, type)
     CORE_ADDR addr;
     int len;
     int type;
{
  CORE_ADDR dcr, dda1, dda2;

  dcr = read_register (DCR_REGNUM);
  dda1 = read_register (DDA1_REGNUM);
  dda2 = read_register (DDA2_REGNUM);

  if ((dcr & DDA1_ENABLE) && addr == dda1)
    write_register (DCR_REGNUM, (dcr & ~DDA1_ENABLE));
  else if ((dcr & DDA2_ENABLE) && addr == dda2)
    write_register (DCR_REGNUM, (dcr & ~DDA2_ENABLE));
  else
    return -1;

  return 0;
}

int
sparclite_insert_hw_breakpoint (addr, len)
     CORE_ADDR addr;
     int len;
{
  CORE_ADDR dcr;

  dcr = read_register (DCR_REGNUM);
  
  if (!(dcr & DIA1_ENABLE))
    {
      write_register (DIA1_REGNUM, addr);
      write_register (DCR_REGNUM, (dcr | DIA1_ENABLE | DIA1_SUP_MODE));
    }
  else if (!(dcr & DIA2_ENABLE))
    {
      write_register (DIA2_REGNUM, addr);
      write_register (DCR_REGNUM, (dcr | DIA2_ENABLE | DIA2_SUP_MODE));
    }
  else
    return -1;

  return 0;
}

int
sparclite_remove_hw_breakpoint (addr, shadow)
     CORE_ADDR addr;
     int shadow;
{
  CORE_ADDR dcr, dia1, dia2;

  dcr = read_register (DCR_REGNUM);
  dia1 = read_register (DIA1_REGNUM);
  dia2 = read_register (DIA2_REGNUM);
  
  if ((dcr & DIA1_ENABLE) && addr == dia1)
    write_register (DCR_REGNUM, (dcr & ~DIA1_ENABLE));
  else if ((dcr & DIA2_ENABLE) && addr == dia2)
    write_register (DCR_REGNUM, (dcr & ~DIA2_ENABLE));
  else
    return -1;

  return 0;
}

int
sparclite_check_watch_resources (type, cnt, ot)
     int type;
     int cnt;
     int ot;
{
  if (type == bp_hardware_breakpoint)
    if (TARGET_HW_BREAK_LIMIT == 0)
      return 0;
    else if (cnt <= TARGET_HW_BREAK_LIMIT)
      return 1;
  else
    if (TARGET_HW_WATCH_LIMIT == 0)
      return 0;
    else if (ot)
      return -1;
    else if (cnt <= TARGET_HW_WATCH_LIMIT)
      return 1;
  return -1;
}

CORE_ADDR
sparclite_stopped_data_address ()
{
  CORE_ADDR dsr, dda1, dda2;

  dsr = read_register (DSR_REGNUM);
  dda1 = read_register (DDA1_REGNUM);
  dda2 = read_register (DDA2_REGNUM);

  if (dsr & 0x10)
    return dda1;
  else if (dsr & 0x20)
    return dda2;
  else
    return 0;
}

static serial_t
open_tty (name)
     char *name;
{
  serial_t desc;

  desc = SERIAL_OPEN (name);
  if (!desc)
    perror_with_name (name);

  if (baud_rate != -1)
    {
      if (SERIAL_SETBAUDRATE (desc, baud_rate))
	{
	  SERIAL_CLOSE (desc);
	  perror_with_name (name);
	}
    }

  SERIAL_RAW (desc);

  SERIAL_FLUSH_INPUT (desc);

  return desc;
}

static int
send_resp (desc, c)
     serial_t desc;
     char c;
{
  int i;

  SERIAL_WRITE (desc, &c, 1);
  i = SERIAL_READCHAR (desc, 2);

  if (i >= 0)
    return i;

  switch (i)
    {
    case SERIAL_ERROR:
      perror_with_name ("Remote communication error");
    case SERIAL_TIMEOUT:
      error ("Remote timeout");
    case SERIAL_EOF:
      error ("Remote connection closed");
    }
}

static void
close_tty (ignore)
     int ignore;
{
  if (!remote_desc)
    return;

  SERIAL_CLOSE (remote_desc);

  remote_desc = NULL;
}

#ifndef __GO32__
static int
recv_udp_buf (fd, buf, len, timeout)
     int fd, len;
     unsigned char *buf;
     int timeout;
{
  int cc;
  fd_set readfds;

  FD_ZERO (&readfds);
  FD_SET (fd, &readfds);

  if (timeout >= 0)
    {
      struct timeval timebuf;

      timebuf.tv_sec = timeout;
      timebuf.tv_usec = 0;
      cc = select (fd + 1, &readfds, 0, 0, &timebuf);
    }
  else
    cc = select (fd + 1, &readfds, 0, 0, 0);

  if (cc == 0)
    return 0;

  if (cc != 1)
    perror_with_name ("recv_udp_buf: Bad return value from select:");

  cc = recv (fd, buf, len, 0);

  if (cc < 0)
    perror_with_name ("Got an error from recv: ");
}

static int
send_udp_buf (fd, buf, len)
     int fd, len;
     unsigned char *buf;
{
  int cc;

  cc = send (fd, buf, len, 0);

  if (cc == len)
    return;

  if (cc < 0)
    perror_with_name ("Got an error from send: ");

  error ("Short count in send: tried %d, sent %d\n", len, cc);
}
#endif /* __GO32__ */

static void
sparclite_open (name, from_tty)
     char *name;
     int from_tty;
{
  struct cleanup *old_chain;
  int c;
  char *p;

  if (!name)
    error ("You need to specify what device or hostname is associated with the SparcLite board.");

  target_preopen (from_tty);

  unpush_target (&sparclite_ops);

  if (remote_target_name)
    free (remote_target_name);

  remote_target_name = strsave (name);

  /* We need a 'serial' or 'udp' keyword to disambiguate host:port, which can
     mean either a serial port on a terminal server, or the IP address of a
     SPARClite demo board.  If there's no colon, then it pretty much has to be
     a local device (except for DOS... grrmble) */

  p = strchr (name, ' ');

  if (p)
    {
      *p++ = '\000';
      while ((*p != '\000') && isspace (*p)) p++;

      if (strncmp (name, "serial", strlen (name)) == 0)
	serial_flag = 1;
      else if (strncmp (name, "udp", strlen (name)) == 0)
	serial_flag = 0;
      else
	error ("Must specify either `serial' or `udp'.");
    }
  else
    {
      p = name;

      if (!strchr (name, ':'))
	serial_flag = 1;	/* No colon is unambiguous (local device) */
      else
	error ("Usage: target sparclite serial /dev/ttyb\n\
or: target sparclite udp host");
    }

  if (serial_flag)
    {
      remote_desc = open_tty (p);

      old_chain = make_cleanup (close_tty, 0);

      c = send_resp (remote_desc, 0x00);

      if (c != 0xaa)
	error ("Unknown response (0x%x) from SparcLite.  Try resetting the board.",
	       c);

      c = send_resp (remote_desc, 0x55);

      if (c != 0x55)
	error ("Sparclite appears to be ill.");
    }
  else
    {
#ifndef __GO32__
      struct hostent *he;
      struct sockaddr_in sockaddr;
      unsigned char buffer[100];
      int cc;

      /* Setup the socket.  Must be raw UDP. */

      he = gethostbyname (p);

      if (!he)
	error ("No such host %s.", p);

      udp_fd = socket (PF_INET, SOCK_DGRAM, 0);

      old_chain = make_cleanup (close, udp_fd);

      sockaddr.sin_family = PF_INET;
      sockaddr.sin_port = htons(7000);
      memcpy (&sockaddr.sin_addr.s_addr, he->h_addr, sizeof (struct in_addr));

      if (connect (udp_fd, &sockaddr, sizeof(sockaddr)))
	perror_with_name ("Connect failed");

      buffer[0] = 0x5;
      buffer[1] = 0;

      send_udp_buf (udp_fd, buffer, 2);	/* Request version */
      cc = recv_udp_buf (udp_fd, buffer, sizeof(buffer), 5); /* Get response */
      if (cc == 0)
	error ("SPARClite isn't responding.");

      if (cc < 3)
	error ("SPARClite appears to be ill.");
#else
      error ("UDP downloading is not supported for DOS hosts.");
#endif /* __GO32__ */
    }

  printf_unfiltered ("[SPARClite appears to be alive]\n");

  push_target (&sparclite_ops);

  discard_cleanups (old_chain);

  return;
}

static void
sparclite_close (quitting)
     int quitting;
{
  if (serial_flag)
    close_tty (0);
#ifndef __GO32__
  else
    if (udp_fd != -1)
      close (udp_fd);
#endif
}

#define LOAD_ADDRESS 0x40000000

static void
download (target_name, args, from_tty, write_routine, start_routine)
     char *target_name;
     char *args;
     int from_tty;
     void (*write_routine)();
     void (*start_routine)();
{
  struct cleanup *old_chain;
  asection *section;
  bfd *pbfd;
  bfd_vma entry;
  int i;
#define WRITESIZE 1024
  char *filename;
  int quiet;
  int nostart;

  quiet = 0;
  nostart = 0;
  filename = NULL;

  while (*args != '\000')
    {
      char *arg;

      while (isspace (*args)) args++;

      arg = args;

      while ((*args != '\000') && !isspace (*args)) args++;

      if (*args != '\000')
	*args++ = '\000';

      if (*arg != '-')
	filename = arg;
      else if (strncmp (arg, "-quiet", strlen (arg)) == 0)
	quiet = 1;
      else if (strncmp (arg, "-nostart", strlen (arg)) == 0)
	nostart = 1;
      else
	error ("unknown option `%s'", arg);
    }

  if (!filename)
    filename = get_exec_file (1);

  pbfd = bfd_openr (filename, gnutarget);
  if (pbfd == NULL)
    {
      perror_with_name (filename);
      return;
    }
  old_chain = make_cleanup (bfd_close, pbfd);

  if (!bfd_check_format (pbfd, bfd_object)) 
    error ("\"%s\" is not an object file: %s", filename,
	   bfd_errmsg (bfd_get_error ()));

  for (section = pbfd->sections; section; section = section->next) 
    {
      if (bfd_get_section_flags (pbfd, section) & SEC_LOAD)
	{
	  bfd_vma section_address;
	  bfd_size_type section_size;
	  file_ptr fptr;

	  section_address = bfd_get_section_vma (pbfd, section);
	  /* Adjust sections from a.out files, since they don't
	     carry their addresses with.  */
	  if (bfd_get_flavour (pbfd) == bfd_target_aout_flavour)
	    section_address += LOAD_ADDRESS;

	  section_size = bfd_get_section_size_before_reloc (section);

	  if (!quiet)
	    printf_filtered ("[Loading section %s at 0x%x (%d bytes)]\n",
			     bfd_get_section_name (pbfd, section),
			     section_address,
			     section_size);

	  fptr = 0;
	  while (section_size > 0)
	    {
	      int count;
	      static char inds[] = "|/-\\";
	      static int k = 0;

	      QUIT;

	      count = min (section_size, WRITESIZE);

	      write_routine (pbfd, section, fptr, section_address, count);

	      if (!quiet)
		{
		  printf_unfiltered ("\r%c", inds[k++ % 4]);
		  gdb_flush (gdb_stdout);
		}

	      section_address += count;
	      fptr += count;
	      section_size -= count;
	    }
	}
    }

  if (!nostart)
    {
      entry = bfd_get_start_address (pbfd);

      if (!quiet)
	printf_unfiltered ("[Starting %s at 0x%x]\n", filename, entry);

      start_routine (entry);
    }

  do_cleanups (old_chain);
}

static void
sparclite_serial_start (entry)
     bfd_vma entry;
{
  char buffer[5];
  int i;

  buffer[0] = 0x03;
  store_unsigned_integer (buffer + 1, 4, entry);

  SERIAL_WRITE (remote_desc, buffer, 1 + 4);
  i = SERIAL_READCHAR (remote_desc, 2);
  if (i != 0x55)
    error ("Can't start SparcLite.  Error code %d\n", i);
}

static void
sparclite_serial_write (from_bfd, from_sec, from_addr, to_addr, len)
     bfd *from_bfd;
     asection *from_sec;
     file_ptr from_addr;
     bfd_vma to_addr;
     int len;
{
  char buffer[4 + 4 + WRITESIZE]; /* addr + len + data */
  unsigned char checksum;
  int i;

  store_unsigned_integer (buffer, 4, to_addr); /* Address */
  store_unsigned_integer (buffer + 4, 4, len); /* Length */

  bfd_get_section_contents (from_bfd, from_sec, buffer + 8, from_addr, len);

  checksum = 0;
  for (i = 0; i < len; i++)
    checksum += buffer[8 + i];

  i = send_resp (remote_desc, 0x01);

  if (i != 0x5a)
    error ("Bad response from load command (0x%x)", i);

  SERIAL_WRITE (remote_desc, buffer, 4 + 4 + len);
  i = SERIAL_READCHAR (remote_desc, 2);
  if (i < 0)
    error ("I/O error in serial code.  Return code %d\n", i);

  if (i != checksum)
    error ("Bad checksum from load command (0x%x)", i);
}

#ifndef __GO32__

static unsigned short
calc_checksum (buffer, count)
     unsigned char *buffer;
     int count;
{
  unsigned short checksum;

  checksum = 0;
  for (; count > 0; count -= 2, buffer += 2)
    checksum += (*buffer << 8) | *(buffer + 1);

  if (count != 0)
    checksum += *buffer << 8;

  return checksum;
}

static void
sparclite_udp_start (entry)
     bfd_vma entry;
{
  unsigned char buffer[6];
  int i;

  buffer[0] = 0x3;
  buffer[1] = 0;
  buffer[2] = entry >> 24;
  buffer[3] = entry >> 16;
  buffer[4] = entry >> 8;
  buffer[5] = entry;

  send_udp_buf (udp_fd, buffer, 6); /* Send start addr */
  i = recv_udp_buf (udp_fd, buffer, sizeof(buffer), -1); /* Get response */

  if (i < 1 || buffer[0] != 0x55)
    error ("Failed to take start address.");
}

static void
sparclite_udp_write (from_bfd, from_sec, from_addr, to_addr, len)
     bfd *from_bfd;
     asection *from_sec;
     file_ptr from_addr;
     bfd_vma to_addr;
     int len;
{
  unsigned char buffer[2000];
  unsigned short checksum;
  static int pkt_num = 0;
  static unsigned long old_addr = -1;
  int i;

  while (1)
    {
      if (to_addr != old_addr)
	{
	  buffer[0] = 0x1;	/* Load command */
	  buffer[1] = 0x1;	/* Loading address */
	  buffer[2] = to_addr >> 24;
	  buffer[3] = to_addr >> 16;
	  buffer[4] = to_addr >> 8;
	  buffer[5] = to_addr;

	  checksum = 0;
	  for (i = 0; i < 6; i++)
	    checksum += buffer[i];
	  checksum &= 0xff;

	  send_udp_buf (udp_fd, buffer, 6);
	  i = recv_udp_buf (udp_fd, buffer, sizeof buffer, -1);

	  if (i < 1)
	    error ("Got back short checksum for load addr.");

	  if (checksum != buffer[0])
	    error ("Got back bad checksum for load addr.");

	  pkt_num = 0;		/* Load addr resets packet seq # */
	  old_addr = to_addr;
	}

      bfd_get_section_contents (from_bfd, from_sec, buffer + 6, from_addr,
				len);

      checksum = calc_checksum (buffer + 6, len);

      buffer[0] = 0x1;		/* Load command */
      buffer[1] = 0x2;		/* Loading data */
      buffer[2] = pkt_num >> 8;
      buffer[3] = pkt_num;
      buffer[4] = checksum >> 8;
      buffer[5] = checksum;

      send_udp_buf (udp_fd, buffer, len + 6);
      i = recv_udp_buf (udp_fd, buffer, sizeof buffer, 3);

      if (i == 0)
	{
	  fprintf_unfiltered (gdb_stderr, "send_data: timeout sending %d bytes to address 0x%x retrying\n", len, to_addr);
	  continue;
	}

      if (buffer[0] != 0xff)
	error ("Got back bad response for load data.");

      old_addr += len;
      pkt_num++;

      return;
    }
}

#endif /* __GO32__ */

static void
sparclite_download (filename, from_tty)
     char *filename;
     int from_tty;
{
  if (!serial_flag)
#ifndef __GO32__
    download (remote_target_name, filename, from_tty, sparclite_udp_write,
	      sparclite_udp_start);
#else
    abort ();			/* sparclite_open should prevent this! */
#endif
  else
    download (remote_target_name, filename, from_tty, sparclite_serial_write,
	      sparclite_serial_start);
}

/* Define the target subroutine names */

static struct target_ops sparclite_ops =
{
  "sparclite",			/* to_shortname */
  "SPARClite remote target",	/* to_longname */
  "Use a remote SPARClite target board via a serial line, using a gdb-specific protocol.\n\
Specify the serial device it is connected to (e.g. /dev/ttya).",  /* to_doc */
  sparclite_open,		/* to_open */
  sparclite_close,		/* to_close */
  0,				/* to_attach */
  0,				/* to_detach */
  0,				/* to_resume */
  0,				/* to_wait */
  0,				/* to_fetch_registers */
  0,				/* to_store_registers */
  0,				/* to_prepare_to_store */
  0,				/* to_xfer_memory */
  0,				/* to_files_info */
  0,				/* to_insert_breakpoint */
  0,				/* to_remove_breakpoint */
  0,				/* to_terminal_init */
  0,				/* to_terminal_inferior */
  0,				/* to_terminal_ours_for_output */
  0,				/* to_terminal_ours */
  0,				/* to_terminal_info */
  0,				/* to_kill */
  sparclite_download,		/* to_load */
  0,				/* to_lookup_symbol */
  0,				/* to_create_inferior */
  0,				/* to_mourn_inferior */
  0,				/* to_can_run */
  0,				/* to_notice_signals */
  0,				/* to_stop */
  download_stratum,		/* to_stratum */
  0,				/* to_next */
  0,				/* to_has_all_memory */
  0,				/* to_has_memory */
  0,				/* to_has_stack */
  0,				/* to_has_registers */
  0,				/* to_has_execution */
  0,				/* sections */
  0,				/* sections_end */
  OPS_MAGIC			/* to_magic */
  };

void
_initialize_sparcl_tdep ()
{
  add_target (&sparclite_ops);
}