static void host_signal_handler(int host_signum, siginfo_t *info,
void *puc)
{
int sig;
target_siginfo_t tinfo;
/* the CPU emulator uses some host signals to detect exceptions,
we we forward to it some signals */
if (host_signum == SIGSEGV || host_signum == SIGBUS) {
if (cpu_signal_handler(host_signum, (void*)info, puc))
return;
}
/* get target signal number */
sig = host_to_target_signal(host_signum);
if (sig < 1 || sig > NSIG)
return;
#if defined(DEBUG_SIGNAL)
fprintf(stderr, "qemu: got signal %d\n", sig);
#endif
if (queue_signal(sig, &tinfo) == 1) {
/* interrupt the virtual CPU as soon as possible */
cpu_exit(global_env);
}
}
void kprintf(const char *fmt, ...)
{
va_list listp;
boolean_t state;
if (!disable_serial_output) {
boolean_t early = FALSE;
if (rdmsr64(MSR_IA32_GS_BASE) == 0) {
early = TRUE;
}
/* If PE_kputc has not yet been initialized, don't
* take any locks, just dump to serial */
if (!PE_kputc || early) {
va_start(listp, fmt);
_doprnt(fmt, &listp, pal_serial_putc, 16);
va_end(listp);
return;
}
/*
* Spin to get kprintf lock but poll for incoming signals
* while interrupts are masked.
*/
state = ml_set_interrupts_enabled(FALSE);
pal_preemption_assert();
while (!simple_lock_try(&kprintf_lock)) {
(void) cpu_signal_handler(NULL);
}
if (cpu_number() != cpu_last_locked) {
MP_DEBUG_KPRINTF("[cpu%d...]\n", cpu_number());
cpu_last_locked = cpu_number();
}
va_start(listp, fmt);
_doprnt(fmt, &listp, PE_kputc, 16);
va_end(listp);
simple_unlock(&kprintf_lock);
ml_set_interrupts_enabled(state);
}
}
struct savearea * interrupt(
int type,
struct savearea *ssp,
unsigned int dsisr,
unsigned int dar)
{
int current_cpu;
struct per_proc_info *proc_info;
uint64_t now;
thread_t thread;
disable_preemption();
perfCallback fn = perfIntHook;
if(fn) { /* Is there a hook? */
if(fn(type, ssp, dsisr, dar) == KERN_SUCCESS) return ssp; /* If it succeeds, we are done... */
}
#if CONFIG_DTRACE
if(tempDTraceIntHook) { /* Is there a hook? */
if(tempDTraceIntHook(type, ssp, dsisr, dar) == KERN_SUCCESS) return ssp; /* If it succeeds, we are done... */
}
#endif
#if 0
{
extern void fctx_text(void);
fctx_test();
}
#endif
current_cpu = cpu_number();
proc_info = getPerProc();
switch (type) {
case T_DECREMENTER:
KERNEL_DEBUG_CONSTANT(MACHDBG_CODE(DBG_MACH_EXCP_DECI, 0) | DBG_FUNC_NONE,
isync_mfdec(), (unsigned int)ssp->save_srr0, 0, 0, 0);
now = mach_absolute_time(); /* Find out what time it is */
if(now >= proc_info->pms.pmsPop) { /* Is it time for power management state change? */
pmsStep(1); /* Yes, advance step */
now = mach_absolute_time(); /* Get the time again since we ran a bit */
}
thread = current_thread(); /* Find ourselves */
if(thread->machine.qactTimer != 0) { /* Is the timer set? */
if (thread->machine.qactTimer <= now) { /* It is set, has it popped? */
thread->machine.qactTimer = 0; /* Clear single shot timer */
if((unsigned int)thread->machine.vmmControl & 0xFFFFFFFE) { /* Are there any virtual machines? */
vmm_timer_pop(thread); /* Yes, check out them out... */
}
}
}
etimer_intr(USER_MODE(ssp->save_srr1), ssp->save_srr0); /* Handle event timer */
break;
case T_INTERRUPT:
/* Call the platform interrupt routine */
counter(c_incoming_interrupts++);
KERNEL_DEBUG_CONSTANT(MACHDBG_CODE(DBG_MACH_EXCP_INTR, 0) | DBG_FUNC_START,
current_cpu, (unsigned int)ssp->save_srr0, 0, 0, 0);
#if CONFIG_DTRACE && (DEVELOPMENT || DEBUG )
DTRACE_INT5(interrupt__start, void *, proc_info->interrupt_nub, int, proc_info->interrupt_source,
void *, proc_info->interrupt_target, IOInterruptHandler, proc_info->interrupt_handler,
void *, proc_info->interrupt_refCon);
#endif
proc_info->interrupt_handler(
proc_info->interrupt_target,
proc_info->interrupt_refCon,
proc_info->interrupt_nub,
proc_info->interrupt_source);
#if CONFIG_DTRACE && (DEVELOPMENT || DEBUG )
DTRACE_INT5(interrupt__complete, void *, proc_info->interrupt_nub, int, proc_info->interrupt_source,
void *, proc_info->interrupt_target, IOInterruptHandler, proc_info->interrupt_handler,
void *, proc_info->interrupt_refCon);
#endif
KERNEL_DEBUG_CONSTANT(MACHDBG_CODE(DBG_MACH_EXCP_INTR, 0) | DBG_FUNC_END,
0, 0, 0, 0, 0);
break;
case T_SIGP:
/* Did the other processor signal us? */
cpu_signal_handler();
break;
case T_SHUTDOWN:
cpu_doshutdown();
panic("returning from cpu_doshutdown()\n");
break;
default:
if (!Call_Debugger(type, ssp))
unresolved_kernel_trap(type, ssp, dsisr, dar, NULL);
break;
}
enable_preemption();
return ssp;
}