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/*
* Hooks for GDB
*
*/
#include <bsp.h>
#include <rtems/m68k/m68302.h>
#include <m68302scc.h>
static int initialised = 0;
/*
* This file does not intend to make things part of the public interface.
* Methods here are only available to the GDB stub. So prototypes are
* needed to avoid warnings.
*/
void putDebugChar(char ch);
char getDebugChar(void);
void exceptionHandler(unsigned int vector, void *handler);
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 {
uint16_t move_a7; /* move #FORMAT_ID,%a7@- */
uint16_t format_id;
uint16_t jmp; /* jmp _ISR_Handlers */
uint32_t 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)
{
uint32_t *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 = (uint32_t) handler;
interrupt_table[vector] = (uint32_t) &gdb_jump_table[vector];
}
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