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/*  main.c -- top level of ARMulator:  ARM6 Instruction Emulator.

    Copyright (C) 1994 Advanced RISC Machines Ltd.

    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. */

/**********************************************************************/

/* Forks the ARMulator and hangs on a socket passing on RDP messages  */

/* down a pipe to the ARMulator which translates them into RDI calls. */

/**********************************************************************/

#include <stdio.h>

#include <string.h>

#include <sys/types.h>

#include <sys/socket.h>

#include <netinet/in.h>

#include <signal.h>

#include <netdb.h>

#include <unistd.h>

#include "armdefs.h"

#include "dbg_rdi.h"

#include "dbg_conf.h"

#define MAXHOSTNAMELENGTH 64

/* Read and write routines down sockets and pipes */

void MYread_chars (int sock, void *p, int n);

unsigned char MYread_char (int sock);

ARMword MYread_word (int sock);

void MYread_FPword (int sock, char *putinhere);

void MYwrite_word (int sock, ARMword i);

void MYwrite_string (int sock, char *s);

void MYwrite_FPword (int sock, char *fromhere);

void MYwrite_char (int sock, unsigned char c);

void passon (int source, int dest, int n);

/* Mother and child processes */

void parent (void);

void kid (void);

/* The child process id. */

pid_t child;

/* The socket to the debugger */

int debugsock;

/* The pipes between the two processes */

int mumkid[2];

int kidmum[2];

/* A pipe for handling SWI return values that goes straight from the */

/* parent to the ARMulator host interface, bypassing the childs RDP */

/* to RDI interpreter */

int DebuggerARMul[2];

/* The maximum number of file descriptors */

int nfds;

/* The socket handle */

int sockethandle;

/* The machine name */

char localhost[MAXHOSTNAMELENGTH + 1];

/* The socket number */

unsigned int socketnumber;

/**************************************************************/

/* Takes one argument: the socket number.                     */

/* Opens a socket to the debugger, and once opened spawns the */

/* ARMulator and sets up a couple of pipes.                   */

/**************************************************************/

int

main (int argc, char *argv[])

{

  int i;

  struct sockaddr_in devil, isa;

  struct hostent *hp;

  if (argc == 1)

    {

      fprintf (stderr, "No socket number\n");

      return 1;

    }

  sscanf (argv[1], "%d", &socketnumber);

  if (!socketnumber || socketnumber > 0xffff)

    {

      fprintf (stderr, "Invalid socket number: %d\n", socketnumber);

      return 1;

    }

  gethostname (localhost, MAXHOSTNAMELENGTH);

  hp = gethostbyname (localhost);

  if (!hp)

    {

      fprintf (stderr, "Cannot get local host info\n");

      return 1;

    }

  /* Open a socket */

  sockethandle = socket (hp->h_addrtype, SOCK_STREAM, 0);

  if (sockethandle == -1)

    {

      perror ("socket");

      return 1;

    }

  devil.sin_family = hp->h_addrtype;

  devil.sin_port = htons (socketnumber);

  devil.sin_addr.s_addr = 0;

  for (i = 0; i < sizeof (devil.sin_zero); i++)

    devil.sin_zero[i] = '\000';

  memcpy (&devil.sin_addr, hp->h_addr_list[0], hp->h_length);

  if (bind (sockethandle, &devil, sizeof (devil)) < 0)

    {

      perror ("bind");

      return 1;

    }

  /* May only accept one debugger at once */

  if (listen (sockethandle, 0))

    {

      perror ("listen");

      return 1;

    }

  fprintf (stderr, "Waiting for connection from debugger...");

  debugsock = accept (sockethandle, &isa, &i);

  if (debugsock == -1)

    {

      perror ("accept");

      return 1;

    }

  fprintf (stderr, " done.\nConnection Established.\n");

  nfds = getdtablesize ();

  if (pipe (mumkid))

    {

      perror ("pipe");

      return 1;

    }

  if (pipe (kidmum))

    {

      perror ("pipe");

      return 1;

    }

  if (pipe (DebuggerARMul))

    {

      perror ("pipe");

      return 1;

    }

#ifdef DEBUG

  fprintf (stderr, "Created pipes ok\n");

#endif

  child = fork ();

#ifdef DEBUG

  fprintf (stderr, "fork() ok\n");

#endif

  if (child == 0)

    kid ();

  if (child != -1)

    parent ();

  perror ("fork");

  return 1;

}