void
cyg_hal_gdb_interrupt (target_register_t pc)
{
t_inst break_inst = HAL_BREAKINST;
CYGARC_HAL_SAVE_GP();
// Clear flag that we Continued instead of Stepping
cyg_hal_gdb_running_step = 0;
// and override existing break? So that a ^C takes effect...
if (NULL != break_buffer.targetAddr)
cyg_hal_gdb_remove_break( (target_register_t)break_buffer.targetAddr );
if (NULL == break_buffer.targetAddr) {
// Not always safe to read/write directly to program
// memory due to possibly unaligned instruction, use the
// provided memory functions instead.
__read_mem_safe(&break_buffer.savedInstr, (t_inst*)pc, HAL_BREAKINST_SIZE);
__write_mem_safe(&break_inst, (t_inst*)pc, HAL_BREAKINST_SIZE);
// Save the PC where we put the break, so we can remove
// it after the target takes the break.
break_buffer.targetAddr = (t_inst*)pc;
__data_cache(CACHE_FLUSH);
__instruction_cache(CACHE_FLUSH);
}
CYGARC_HAL_RESTORE_GP();
}
static void
__insert_break(int indx, target_register_t pc)
{
sstep_instr[indx].targetAddr = (t_inst *)pc;
sstep_instr[indx].savedInstr = *(t_inst *)pc;
*(t_inst*)pc = (t_inst)HAL_BREAKINST;
__data_cache(CACHE_FLUSH);
__instruction_cache(CACHE_FLUSH);
}
void
install_async_breakpoint(void *pc)
{
asyncBuffer.targetAddr = pc;
asyncBuffer.savedInstr = *(t_inst *)pc;
*(t_inst *)pc = (t_inst)HAL_BREAKINST;
__instruction_cache(CACHE_FLUSH);
__data_cache(CACHE_FLUSH);
}
static void
__remove_break(int indx)
{
if (sstep_instr[indx].targetAddr != 0) {
*(sstep_instr[indx].targetAddr) = sstep_instr[indx].savedInstr;
sstep_instr[indx].targetAddr = 0;
__data_cache(CACHE_FLUSH);
__instruction_cache(CACHE_FLUSH);
}
}
int
cyg_hal_gdb_remove_break (target_register_t pc)
{
if ( cyg_hal_gdb_running_step )
return 0;
if ((t_inst*)pc == break_buffer.targetAddr) {
__write_mem_safe(&break_buffer.savedInstr, (t_inst*)pc, HAL_BREAKINST_SIZE);
break_buffer.targetAddr = NULL;
__data_cache(CACHE_FLUSH);
__instruction_cache(CACHE_FLUSH);
return 1;
}
return 0;
}
int __computeSignal (unsigned int trap_number)
{
if (asyncBuffer.targetAddr != NULL)
{
/* BP installed by serial driver to stop running program */
*asyncBuffer.targetAddr = asyncBuffer.savedInstr;
__instruction_cache(CACHE_FLUSH);
__data_cache(CACHE_FLUSH);
asyncBuffer.targetAddr = NULL;
return SIGINT;
}
#ifdef SIGSYSCALL
switch (trap_number)
{
case SIGSYSCALL:
/* System call */
return SIGSYSCALL;
}
#endif
return SIGTRAP;
}