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gdb_hook.c

/*
 * Carsten Langgaard, carstenl@mips.com
 * Copyright (C) 2000 MIPS Technologies, Inc.  All rights reserved.
 *
 *  This program is free software; you can distribute it and/or modify it
 *  under the terms of the GNU General Public License (Version 2) as
 *  published by the Free Software Foundation.
 *
 *  This program is distributed in the hope 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 is the interface to the remote debugger stub.
 */
#include <linux/types.h>
#include <linux/serial.h>
#include <linux/serialP.h>
#include <linux/serial_reg.h>

#include <asm/serial.h>
#include <asm/io.h>

static struct serial_state rs_table[] = {
      SERIAL_PORT_DFNS  /* Defined in serial.h */
};

static struct async_struct kdb_port_info = {0};

int (*generic_putDebugChar)(char);
char (*generic_getDebugChar)(void);

static __inline__ unsigned int serial_in(struct async_struct *info, int offset)
{
      return inb(info->port + offset);
}

static __inline__ void serial_out(struct async_struct *info, int offset,
                        int value)
{
      outb(value, info->port+offset);
}

int rs_kgdb_hook(int tty_no, int speed) {
      int t;
      struct serial_state *ser = &rs_table[tty_no];

      kdb_port_info.state = ser;
      kdb_port_info.magic = SERIAL_MAGIC;
      kdb_port_info.port = ser->port;
      kdb_port_info.flags = ser->flags;

      /*
       * Clear all interrupts
       */
      serial_in(&kdb_port_info, UART_LSR);
      serial_in(&kdb_port_info, UART_RX);
      serial_in(&kdb_port_info, UART_IIR);
      serial_in(&kdb_port_info, UART_MSR);

      /*
       * Now, initialize the UART
       */
      serial_out(&kdb_port_info, UART_LCR, UART_LCR_WLEN8); /* reset DLAB */
      if (kdb_port_info.flags & ASYNC_FOURPORT) {
            kdb_port_info.MCR = UART_MCR_DTR | UART_MCR_RTS;
            t = UART_MCR_DTR | UART_MCR_OUT1;
      } else {
            kdb_port_info.MCR
                  = UART_MCR_DTR | UART_MCR_RTS | UART_MCR_OUT2;
            t = UART_MCR_DTR | UART_MCR_RTS;
      }

      kdb_port_info.MCR = t;        /* no interrupts, please */
      serial_out(&kdb_port_info, UART_MCR, kdb_port_info.MCR);

      /*
       * and set the speed of the serial port
       */
      if (speed == 0)
            speed = 9600;

      t = kdb_port_info.state->baud_base / speed;
      /* set DLAB */
      serial_out(&kdb_port_info, UART_LCR, UART_LCR_WLEN8 | UART_LCR_DLAB);
      serial_out(&kdb_port_info, UART_DLL, t & 0xff);/* LS of divisor */
      serial_out(&kdb_port_info, UART_DLM, t >> 8);  /* MS of divisor */
      /* reset DLAB */
      serial_out(&kdb_port_info, UART_LCR, UART_LCR_WLEN8);

      return speed;
}

int putDebugChar(char c)
{
      return generic_putDebugChar(c);
}

char getDebugChar(void)
{
      return generic_getDebugChar();
}

int rs_putDebugChar(char c)
{

      if (!kdb_port_info.state) {   /* need to init device first */
            return 0;
      }

      while ((serial_in(&kdb_port_info, UART_LSR) & UART_LSR_THRE) == 0)
            ;

      serial_out(&kdb_port_info, UART_TX, c);

      return 1;
}

char rs_getDebugChar(void)
{
      if (!kdb_port_info.state) {   /* need to init device first */
            return 0;
      }

      while (!(serial_in(&kdb_port_info, UART_LSR) & 1))
            ;

      return serial_in(&kdb_port_info, UART_RX);
}

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