/*
* kdb_trap - field a TRACE or BPT trap
* Return non-zero if we "handled" the trap.
*/
int
kdb_trap(int type, db_regs_t *regs)
{
switch (type) {
case T_TRACE: /* single-step */
case T_BREAKPOINT: /* breakpoint */
/* case T_WATCHPOINT:*/
break;
case -1:
break;
default:
kdbprinttrap(type, 0);
if (db_recover != 0) {
/* This will longjmp back to db_command_loop */
db_error("Caught exception in ddb.\n");
/*NOTREACHED*/
}
/*
* Tell caller "We did NOT handle the trap."
* Caller should panic or whatever.
*/
return 0;
}
/*
* We'd like to be on a separate debug stack here, but
* that's easier to do in locore.s before we get here.
* See sun3/locore.s:T_TRACE for stack switch code.
*/
ddb_regs = *regs;
db_active++;
cnpollc(true); /* set polling mode, unblank video */
db_trap(type, 0); /* where the work happens */
cnpollc(false); /* resume interrupt mode */
db_active--;
*regs = ddb_regs;
/*
* Indicate that single_step is for KDB.
* But lock out interrupts to prevent TRACE_KDB from setting the
* trace bit in the current SR (and trapping while exiting KDB).
*/
(void)spl7();
/*
* Tell caller "We HAVE handled the trap."
* Caller will return to locore and rte.
*/
return 1;
}
boolean_t
kdb_trap(
int type,
int code,
struct i386_saved_state *regs)
{
spl_t s;
s = splhigh();
saved_ipl[cpu_number()] = s;
switch (type) {
case T_DEBUG: /* single_step */
{
int addr;
int status = get_dr6();
if (status & 0xf) { /* hmm hdw break */
addr = status & 0x8 ? get_dr3() :
status & 0x4 ? get_dr2() :
status & 0x2 ? get_dr1() :
get_dr0();
regs->efl |= EFL_RF;
db_single_step_cmd(addr, 0, 1, "p");
}
}
case T_INT3: /* breakpoint */
case T_WATCHPOINT: /* watchpoint */
case -1: /* keyboard interrupt */
break;
default:
if (db_recover) {
i386_nested_saved_state = *regs;
db_printf("Caught %s (%d), code = %x, pc = %x\n",
trap_name(type), type, code, regs->eip);
db_error("");
/*NOTREACHED*/
}
kdbprinttrap(type, code);
}
#if NCPUS > 1
if (db_enter())
#endif /* NCPUS > 1 */
{
i386_last_saved_statep = regs;
i386_last_kdb_sp = (unsigned) &type;
/* XXX Should switch to ddb`s own stack here. */
ddb_regs = *regs;
if ((regs->cs & 0x3) == KERNEL_RING) {
/*
* Kernel mode - esp and ss not saved
*/
ddb_regs.uesp = (int)®s->uesp; /* kernel stack pointer */
ddb_regs.ss = KERNEL_DS;
}
cnpollc(TRUE);
db_task_trap(type, code, (regs->cs & 0x3) != 0);
cnpollc(FALSE);
regs->eip = ddb_regs.eip;
regs->efl = ddb_regs.efl;
regs->eax = ddb_regs.eax;
regs->ecx = ddb_regs.ecx;
regs->edx = ddb_regs.edx;
regs->ebx = ddb_regs.ebx;
if ((regs->cs & 0x3) != KERNEL_RING) {
/*
* user mode - saved esp and ss valid
*/
regs->uesp = ddb_regs.uesp; /* user stack pointer */
regs->ss = ddb_regs.ss & 0xffff; /* user stack segment */
}
regs->ebp = ddb_regs.ebp;
regs->esi = ddb_regs.esi;
regs->edi = ddb_regs.edi;
regs->es = ddb_regs.es & 0xffff;
regs->cs = ddb_regs.cs & 0xffff;
regs->ds = ddb_regs.ds & 0xffff;
regs->fs = ddb_regs.fs & 0xffff;
regs->gs = ddb_regs.gs & 0xffff;
if ((type == T_INT3) &&
(db_get_task_value(regs->eip, BKPT_SIZE, FALSE, TASK_NULL)
== BKPT_INST))
regs->eip += BKPT_SIZE;
}
#if NCPUS > 1
db_leave();
#endif /* NCPUS > 1 */
splx(s);
return 1;
}
/*
* kdb_trap - field a TRACE or BPT trap
*/
void
kdb_trap(
int type,
struct savearea *regs)
{
boolean_t trap_from_user;
int previous_console_device;
int code=0;
previous_console_device=switch_to_serial_console();
switch (type) {
case T_TRACE: /* single_step */
case T_PROGRAM: /* breakpoint */
#if 0
case T_WATCHPOINT: /* watchpoint */
#endif
case -1: /* keyboard interrupt */
break;
default:
if (db_recover) {
ppc_nested_saved_state = *regs;
db_printf("Caught ");
if (type > TRAP_TYPES)
db_printf("type %d", type);
else
db_printf("%s", trap_type[type]);
db_printf(" trap, pc = %x\n",
regs->save_srr0);
db_error("");
/*NOTREACHED*/
}
kdbprinttrap(type, code, (int *)®s->save_srr0, regs->save_r1);
}
saved_state[cpu_number()] = regs;
ppc_last_saved_statep = regs;
ppc_last_kdb_sp = (unsigned) &type;
if (!IS_USER_TRAP(regs)) {
bzero((char *)&ddb_regs, sizeof (ddb_regs));
ddb_regs = *regs;
trap_from_user = FALSE;
}
else {
ddb_regs = *regs;
trap_from_user = TRUE;
}
db_task_trap(type, code, trap_from_user);
*regs = ddb_regs;
if ((type == T_PROGRAM) &&
(db_get_task_value(regs->save_srr0,
BKPT_SIZE,
FALSE,
db_target_space(current_act(),
trap_from_user))
== BKPT_INST))
regs->save_srr0 += BKPT_SIZE;
kdb_exit:
saved_state[cpu_number()] = 0;
switch_to_old_console(previous_console_device);
}
