remote-mm.c

早期freebsd实现

  out_msg_buf->go_msg.code = GO;
  out_msg_buf->go_msg.length = 0;
  msg_send_serial(out_msg_buf);
  /* No message to expect after a GO */
}

/**************************************************************** REMOTE_CLOSE
** Close the open connection to the minimon debugger.
   Use this when you want to detach and do something else
   with your gdb.  */
static void
mm_close (quitting)	/*FIXME: how is quitting used */
     int quitting;
{
  if (mm_desc < 0)
    error ("Can't close remote connection: not debugging remotely.");

  /* We should never get here if there isn't something valid in
     mm_desc and mm_stream.  

     Due to a bug in Unix, fclose closes not only the stdio stream,
     but also the file descriptor.  So we don't actually close
     mm_desc.  */
  DRAIN_INPUT();
  fclose (mm_stream);	
  /* close (mm_desc); */

  /* Do not try to close mm_desc again, later in the program.  */
  mm_stream = NULL;
  mm_desc = -1;

#if defined (LOG_FILE)
  if (ferror (log_file))
    printf ("Error writing log file.\n");
  if (fclose (log_file) != 0)
    printf ("Error closing log file.\n");
#endif

  printf ("Ending remote debugging\n");
} 

/************************************************************* REMOTE_ATACH */
/* Attach to a program that is already loaded and running 
 * Upon exiting the process's execution is stopped.
 */
static void
mm_attach (args, from_tty)
     char *args;
     int from_tty;
{

  if (!mm_stream)
      error ("MiniMon not opened yet, use the 'target minimon' command.\n");
	
  if (from_tty)
      printf ("Attaching to remote program %s...\n", prog_name);

  /* Make sure the target is currently running, it is supposed to be. */
  /* FIXME: is it ok to send MiniMon a BREAK if it is already stopped in 
   * 	the dbg core.  If so, we don't need to send this GO.
   */
  out_msg_buf->go_msg.code = GO;
  out_msg_buf->go_msg.length = 0;
  msg_send_serial(out_msg_buf);
  sleep(2);	/* At the worst it will stop, receive a message, continue */
 
  /* Send the mm a break. */ 
  out_msg_buf->break_msg.code = BREAK;
  out_msg_buf->break_msg.length = 0;
  msg_send_serial(out_msg_buf);
}
/********************************************************** REMOTE_DETACH */
/* Terminate the open connection to the remote debugger.
   Use this when you want to detach and do something else
   with your gdb.  Leave remote process running (with no breakpoints set). */
static void
mm_detach (args,from_tty)
     char *args;
     int from_tty;
{
  remove_breakpoints();		/* Just in case there were any left in */
  out_msg_buf->go_msg.code = GO;
  out_msg_buf->go_msg.length = 0;
  msg_send_serial(out_msg_buf);
  pop_target();         	/* calls mm_close to do the real work */
}


/*************************************************************** REMOTE_RESUME
** Tell the remote machine to resume.  */

static void
mm_resume (step, sig)
     int step, sig;
{
  if (sig)
    error ("Can't send signals to a remote MiniMon system.");

  if (step) {
      out_msg_buf->step_msg.code= STEP;
      out_msg_buf->step_msg.length = 1*4;
      out_msg_buf->step_msg.count = 1;		/* step 1 instruction */
      msg_send_serial(out_msg_buf);
  } else {
      out_msg_buf->go_msg.code= GO;
      out_msg_buf->go_msg.length = 0;
      msg_send_serial(out_msg_buf);
  }
}

/***************************************************************** REMOTE_WAIT
** Wait until the remote machine stops, then return,
   storing status in STATUS just as `wait' would.  */

static int
mm_wait (status)
     WAITTYPE *status;
{
  int i, result;
  int old_timeout = timeout;
  int old_immediate_quit = immediate_quit;

  WSETEXIT ((*status), 0);


/* wait for message to arrive. It should be:
	- A HIF service request.
	- A HIF exit service request.
	- A CHANNEL0_ACK.
	- A CHANNEL1 request.
	- a debugcore HALT message.
  HIF services must be responded too, and while-looping continued.
  If the target stops executing, mm_wait() should return.
*/
  timeout = 0;	/* Wait indefinetly for a message */
  immediate_quit = 1;   /* Helps ability to QUIT */
  while(1)
  {
    while(msg_recv_serial(in_msg_buf)) {
    	QUIT;	/* Let user quit if they want */
    }
    switch (in_msg_buf->halt_msg.code)
    {
    case HIF_CALL:
	i = in_msg_buf->hif_call_rtn_msg.service_number;
	result=service_HIF(in_msg_buf);
   	if(i == 1) /* EXIT */
	    goto exit;
	if(result)
	    printf("Warning: failure during HIF service %d\n", i);
	break;
    case CHANNEL0_ACK:
	service_HIF(in_msg_buf);
	break;
    case CHANNEL1:
        i=in_msg_buf->channel1_msg.length;
        in_msg_buf->channel1_msg.data[i] = '\0';
        printf("%s", in_msg_buf->channel1_msg.data);
	fflush(stdout);
        /* Send CHANNEL1_ACK message */
        out_msg_buf->channel1_ack_msg.code = CHANNEL1_ACK;
        out_msg_buf->channel1_ack_msg.length = 0;
        result = msg_send_serial(out_msg_buf);
	break;
    case HALT:
	goto halted;
    default:
	goto halted;
    }
  }
halted:
  /* FIXME, these printfs should not be here.  This is a source level 
     debugger, guys!  */
  if (in_msg_buf->halt_msg.trap_number== 0)
  { printf("Am290*0 received vector number %d (break point)\n",
	in_msg_buf->halt_msg.trap_number);
    WSETSTOP ((*status), SIGTRAP);
  }
  else if (in_msg_buf->halt_msg.trap_number== 1)
  { printf("Am290*0 received vector number %d\n",
	in_msg_buf->halt_msg.trap_number);
    WSETSTOP ((*status), SIGBUS);
  }
  else if (in_msg_buf->halt_msg.trap_number== 3
        || in_msg_buf->halt_msg.trap_number== 4)
  { printf("Am290*0 received vector number %d\n",
	in_msg_buf->halt_msg.trap_number);
    WSETSTOP ((*status), SIGFPE);
  }
  else if (in_msg_buf->halt_msg.trap_number== 5)
  { printf("Am290*0 received vector number %d\n",
	in_msg_buf->halt_msg.trap_number);
    WSETSTOP ((*status), SIGILL);
  }
  else if (in_msg_buf->halt_msg.trap_number >= 6
        && in_msg_buf->halt_msg.trap_number <= 11)
  { printf("Am290*0 received vector number %d\n",
	in_msg_buf->halt_msg.trap_number);
    WSETSTOP ((*status), SIGSEGV);
  }
  else if (in_msg_buf->halt_msg.trap_number== 12
        || in_msg_buf->halt_msg.trap_number== 13)
  { printf("Am290*0 received vector number %d\n",
	in_msg_buf->halt_msg.trap_number);
    WSETSTOP ((*status), SIGILL);
  }
  else if (in_msg_buf->halt_msg.trap_number== 14)
  { printf("Am290*0 received vector number %d\n",
	in_msg_buf->halt_msg.trap_number);
    WSETSTOP ((*status), SIGALRM);
  }
  else if (in_msg_buf->halt_msg.trap_number== 15)
    WSETSTOP ((*status), SIGTRAP);
  else if (in_msg_buf->halt_msg.trap_number >= 16
        && in_msg_buf->halt_msg.trap_number <= 21)
  { printf("Am290*0 received vector number %d\n",
	in_msg_buf->halt_msg.trap_number);
    WSETSTOP ((*status), SIGINT);
  }
  else if (in_msg_buf->halt_msg.trap_number== 22)
  { printf("Am290*0 received vector number %d\n",
	in_msg_buf->halt_msg.trap_number);
    WSETSTOP ((*status), SIGILL);
  } /* BREAK message was sent */
  else if (in_msg_buf->halt_msg.trap_number== 75)
    WSETSTOP ((*status), SIGTRAP);
  else
exit:
    WSETEXIT ((*status), 0);

  timeout = old_timeout;	/* Restore original timeout value */
  immediate_quit = old_immediate_quit;
  return 0;
}

/******************************************************* REMOTE_FETCH_REGISTERS
 * Read a remote register 'regno'. 
 * If regno==-1 then read all the registers.
 */
static void 
mm_fetch_registers (regno)
int	regno;
{
  INT32 *data_p;

  if (regno >= 0)  {
	fetch_register(regno);
	return;
  }

/* Gr1/rsp */
  out_msg_buf->read_req_msg.byte_count = 4*1;
  out_msg_buf->read_req_msg.memory_space = GLOBAL_REG;
  out_msg_buf->read_req_msg.address = 1;
  msg_send_serial(out_msg_buf);
  expect_msg(READ_ACK,in_msg_buf,1);
  data_p = &(in_msg_buf->read_r_ack_msg.data[0]);
  supply_register (GR1_REGNUM , data_p);

#if defined(GR64_REGNUM)	/* Read gr64-127 */
/* Global Registers gr64-gr95 */ 
  out_msg_buf->read_req_msg.code= READ_REQ;
  out_msg_buf->read_req_msg.length = 4*3;
  out_msg_buf->read_req_msg.byte_count = 4*32;
  out_msg_buf->read_req_msg.memory_space = GLOBAL_REG;
  out_msg_buf->read_req_msg.address = 64;
  msg_send_serial(out_msg_buf);
  expect_msg(READ_ACK,in_msg_buf,1);
  data_p = &(in_msg_buf->read_r_ack_msg.data[0]);

  for (regno=GR64_REGNUM; regno<GR64_REGNUM+32; regno++) {
      supply_register (regno, data_p++);
  }
#endif	/*  GR64_REGNUM */

/* Global Registers gr96-gr127 */ 
  out_msg_buf->read_req_msg.code= READ_REQ;
  out_msg_buf->read_req_msg.length = 4*3;
  out_msg_buf->read_req_msg.byte_count = 4 * 32;
  out_msg_buf->read_req_msg.memory_space = GLOBAL_REG;
  out_msg_buf->read_req_msg.address = 96;
  msg_send_serial(out_msg_buf);
  expect_msg(READ_ACK,in_msg_buf,1);
  data_p = &(in_msg_buf->read_r_ack_msg.data[0]);

  for (regno=GR96_REGNUM; regno<GR96_REGNUM+32; regno++) {
      supply_register (regno, data_p++);
  }

/* Local Registers */ 
  out_msg_buf->read_req_msg.byte_count = 4 * (128);
  out_msg_buf->read_req_msg.memory_space = LOCAL_REG;
  out_msg_buf->read_req_msg.address = 0;
  msg_send_serial(out_msg_buf);
  expect_msg(READ_ACK,in_msg_buf,1);
  data_p = &(in_msg_buf->read_r_ack_msg.data[0]);

  for (regno=LR0_REGNUM; regno<LR0_REGNUM+128; regno++) {
      supply_register (regno, data_p++);
  }

/* Protected Special Registers */ 
  out_msg_buf->read_req_msg.byte_count = 4*15;
  out_msg_buf->read_req_msg.memory_space = SPECIAL_REG;
  out_msg_buf->read_req_msg.address = 0;
  msg_send_serial( out_msg_buf);
  expect_msg(READ_ACK,in_msg_buf,1);
  data_p = &(in_msg_buf->read_r_ack_msg.data[0]);

  for (regno=0; regno<=14; regno++) {
      supply_register (SR_REGNUM(regno), data_p++);
  }
  if (USE_SHADOW_PC) {	/* Let regno_to_srnum() handle the register number */
	fetch_register(NPC_REGNUM);
	fetch_register(PC_REGNUM);
	fetch_register(PC2_REGNUM);
  }

/* Unprotected Special Registers */ 
  out_msg_buf->read_req_msg.byte_count = 4*8;
  out_msg_buf->read_req_msg.memory_space = SPECIAL_REG;
  out_msg_buf->read_req_msg.address = 128;
  msg_send_serial( out_msg_buf);
  expect_msg(READ_ACK,in_msg_buf,1);
  data_p = &(in_msg_buf->read_r_ack_msg.data[0]);

  for (regno=128; regno<=135; regno++) {
      supply_register (SR_REGNUM(regno), data_p++);
  }

  /* There doesn't seem to be any way to get these.  */
  {
    int val = -1;
    supply_register (FPE_REGNUM, &val);
    supply_register (INTE_REGNUM, &val);
    supply_register (FPS_REGNUM, &val);
    supply_register (EXO_REGNUM, &val);
  }
}


/****************************************************** REMOTE_STORE_REGISTERS
 * Store register regno into the target.  
 * If regno==-1 then store all the registers.
 * Result is 0 for success, -1 for failure.
 */

static void
mm_store_registers (regno)
int regno;
{
  int result;
  
  if (regno >= 0) {
    store_register(regno);
    return;
  }

  result = 0;

  out_msg_buf->write_r_msg.code= WRITE_REQ;

/* Gr1/rsp */
  out_msg_buf->write_r_msg.byte_count = 4*1;
  out_msg_buf->write_r_msg.length = 3*4 + out_msg_buf->write_r_msg.byte_count;
  out_msg_buf->write_r_msg.memory_space = GLOBAL_REG;
  out_msg_buf->write_r_msg.address = 1;
  out_msg_buf->write_r_msg.data[0] = read_register (GR1_REGNUM);

  msg_send_serial( out_msg_buf);
  if (!expect_msg(WRITE_ACK,in_msg_buf,1)) {
	result = -1;
  }

#if defined(GR64_REGNUM)
/* Global registers gr64-gr95 */
  out_msg_buf->write_r_msg.byte_count = 4* (32);
  out_msg_buf->write_r_msg.length = 3*4 + out_msg_buf->write_r_msg.byte_count;
  out_msg_buf->write_r_msg.address = 64;

  for (regno=GR64_REGNUM ; regno<GR64_REGNUM+32 ; regno++)
    {
      out_msg_buf->write_r_msg.data[regno-GR64_REGNUM] = read_register (regno);
    }
  msg_send_serial(out_msg_buf);
  if (!expect_msg(WRITE_ACK,in_msg_buf,1)) {
	result = -1;
  }
#endif	/* GR64_REGNUM */

/* Global registers gr96-gr127 */
  out_msg_buf->write_r_msg.byte_count = 4* (32);
  out_msg_buf->write_r_msg.length = 3*4 + out_msg_buf->write_r_msg.byte_count;
  out_msg_buf->write_r_msg.address = 96;
  for (regno=GR96_REGNUM ; regno<GR96_REGNUM+32 ; regno++)
    {
      out_msg_buf->write_r_msg.data[regno-GR96_REGNUM] = read_register (regno);
    }
  msg_send_serial( out_msg_buf);
  if (!expect_msg(WRITE_ACK,in_msg_buf,1)) {
	result = -1;
  }

/* Local Registers */
  out_msg_buf->write_r_msg.memory_space = LOCAL_REG;
  out_msg_buf->write_r_msg.byte_count = 4*128;
  out_msg_buf->write_r_msg.length = 3*4 + out_msg_buf->write_r_msg.byte_count;
  out_msg_buf->write_r_msg.address = 0;