gdb-hooks.c

RTEMS (Real-Time Executive for Multiprocessor Systems) is a free open source real-time operating sys

/*****************************************************************************/
/*
  $Id: gdb-hooks.c,v 1.1 1997/07/31 22:13:23 joel Exp $
  
  Hooks for GDB

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


#include <bsp.h>
#include <m68302.h>
#include <m68302scc.h>

static int initialised = 0;

void putDebugChar(char ch)
{
  if (!initialised)
  {
    scc_initialise(DEBUG_PORT, DEBUG_BAUD, 0);
    initialised = 1;
  }
  
  scc_out(DEBUG_PORT, ch);
}

char getDebugChar(void)
{
  if (!initialised)
  {
    scc_initialise(DEBUG_PORT, DEBUG_BAUD, 0);
    initialised = 1;
  }

  while (!scc_status(DEBUG_PORT, 0));
  
  return scc_in(DEBUG_PORT);  
}

/*
 * Need to create yet another jump table for gdb this time
 */

void (*exceptionHook)(unsigned int) = 0;

typedef struct {
  rtems_unsigned16 move_a7;            /* move #FORMAT_ID,%a7@- */
  rtems_unsigned16 format_id;
  rtems_unsigned16 jmp;                /* jmp  _ISR_Handlers */
  rtems_unsigned32 isr_handler;
} GDB_HANDLER_ENTRY;

#if !defined(M68K_MOVE_A7)
#define M68K_MOVE_A7 0x3F3C
#endif

#if !defined(M68K_JMP)
#define M68K_JMP     0x4EF9
#endif

/* points to jsr-exception-table in targets wo/ VBR register */
static GDB_HANDLER_ENTRY gdb_jump_table[256];

void exceptionHandler(unsigned int vector, void *handler)
{
  rtems_unsigned32 *interrupt_table = 0;
  
  gdb_jump_table[vector].move_a7 = M68K_MOVE_A7;
  gdb_jump_table[vector].format_id = vector;
  gdb_jump_table[vector].jmp = M68K_JMP;
  gdb_jump_table[vector].isr_handler = (rtems_unsigned32) handler;

  interrupt_table[vector] = (rtems_unsigned32) &gdb_jump_table[vector];
}