| Line 126... |
Line 126... |
case SPR_NPC:
|
case SPR_NPC:
|
{
|
{
|
/* The debugger has redirected us to a new address */
|
/* The debugger has redirected us to a new address */
|
/* This is usually done to reissue an instruction
|
/* This is usually done to reissue an instruction
|
which just caused a breakpoint exception. */
|
which just caused a breakpoint exception. */
|
|
|
|
/* JPB patch. When GDB stepi, this may be used to set the PC to the
|
|
value it is already at. If this is the case, then we do nothing (in
|
|
particular we do not trash a delayed branch) */
|
|
|
|
if (value != cpu_state.pc)
|
|
{
|
cpu_state.pc = value;
|
cpu_state.pc = value;
|
|
|
if(!value && config.sim.verbose)
|
if(!value && config.sim.verbose)
|
PRINTF("WARNING: PC just set to 0!\n");
|
PRINTF("WARNING: PC just set to 0!\n");
|
|
|
/* Clear any pending delay slot jumps also */
|
/* Clear any pending delay slot jumps also */
|
cpu_state.delay_insn = 0;
|
cpu_state.delay_insn = 0;
|
pcnext = value + 4;
|
pcnext = value + 4;
|
|
|
|
/* Further JPB patch. If the processor is stalled, then subsequent
|
|
reads of the NPC should return 0 until the processor is
|
|
unstalled. If the processor is stalled, note that the NPC has
|
|
been updated while the processor was stalled. */
|
|
|
|
if (runtime.cpu.stalled)
|
|
{
|
|
cpu_state.npc_not_valid = 1;
|
|
}
|
|
}
|
}
|
}
|
break;
|
break;
|
case SPR_PICSR:
|
case SPR_PICSR:
|
if(!config.pic.edge_trigger)
|
if(!config.pic.edge_trigger)
|
cpu_state.sprs[SPR_PICSR] = prev_val;
|
cpu_state.sprs[SPR_PICSR] = prev_val;
|
| Line 219... |
Line 237... |
|
|
ret = cpu_state.sprs[regno];
|
ret = cpu_state.sprs[regno];
|
|
|
switch (regno) {
|
switch (regno) {
|
case SPR_NPC:
|
case SPR_NPC:
|
|
|
|
/* The NPC is the program counter UNLESS the NPC has been changed and we
|
|
are stalled, which will have flushed the pipeline, so the value is
|
|
zero. Currently this is optional behavior, since it breaks GDB.
|
|
*/
|
|
|
|
if (config.sim.strict_npc && cpu_state.npc_not_valid)
|
|
{
|
|
ret = 0;
|
|
}
|
|
else
|
|
{
|
ret = cpu_state.pc;
|
ret = cpu_state.pc;
|
|
}
|
break;
|
break;
|
|
|
case SPR_TTCR:
|
case SPR_TTCR:
|
ret = spr_read_ttcr();
|
ret = spr_read_ttcr();
|
break;
|
break;
|
default:
|
default:
|
/* Links to GPRS */
|
/* Links to GPRS */
|
