static void
profile_tick(void *arg)
{
profile_probe_t *prof = arg;
#if defined(__x86_64__)
x86_saved_state_t *kern_regs = find_kern_regs(current_thread());
if (NULL != kern_regs) {
/* Kernel was interrupted. */
dtrace_probe(prof->prof_id, saved_state64(kern_regs)->isf.rip, 0x0, 0, 0, 0);
} else {
pal_register_cache_state(current_thread(), VALID);
/* Possibly a user interrupt */
x86_saved_state_t *tagged_regs = (x86_saved_state_t *)find_user_regs(current_thread());
if (NULL == tagged_regs) {
/* Too bad, so sad, no useful interrupt state. */
dtrace_probe(prof->prof_id, 0xcafebabe,
0x0, 0, 0, 0); /* XXX_BOGUS also see profile_usermode() below. */
} else if (is_saved_state64(tagged_regs)) {
x86_saved_state64_t *regs = saved_state64(tagged_regs);
dtrace_probe(prof->prof_id, 0x0, regs->isf.rip, 0, 0, 0);
} else {
x86_saved_state32_t *regs = saved_state32(tagged_regs);
dtrace_probe(prof->prof_id, 0x0, regs->eip, 0, 0, 0);
}
}
#else
#error Unknown architecture
#endif
}
/*
* Real-time clock device interrupt.
*/
void
rtclock_intr(
x86_saved_state_t *tregs)
{
uint64_t rip;
boolean_t user_mode = FALSE;
assert(get_preemption_level() > 0);
assert(!ml_get_interrupts_enabled());
if (is_saved_state64(tregs) == TRUE) {
x86_saved_state64_t *regs;
regs = saved_state64(tregs);
if (regs->isf.cs & 0x03)
user_mode = TRUE;
rip = regs->isf.rip;
} else {
x86_saved_state32_t *regs;
regs = saved_state32(tregs);
if (regs->cs & 0x03)
user_mode = TRUE;
rip = regs->eip;
}
/* call the generic etimer */
timer_intr(user_mode, rip);
}
/* wind-back a syscall instruction */
void
pal_syscall_restart(thread_t thread __unused, x86_saved_state_t *state)
{
/* work out which flavour thread it is */
if( is_saved_state32(state) )
{
x86_saved_state32_t *regs32;
regs32 = saved_state32(state);
if (regs32->cs == SYSENTER_CS || regs32->cs == SYSENTER_TF_CS)
regs32->eip -= 5;
else
regs32->eip -= 2;
}
else
{
x86_saved_state64_t *regs64;
assert( is_saved_state64(state) );
regs64 = saved_state64(state);
/* Only one instruction for 64-bit threads */
regs64->isf.rip -= 2;
}
}
/*
* thread_fast_set_cthread_self: Sets the machine kernel thread ID of the
* current thread to the given thread ID; fast version for 32-bit processes
*
* Parameters: self Thread ID to set
*
* Returns: 0 Success
* !0 Not success
*/
kern_return_t
thread_fast_set_cthread_self(uint32_t self)
{
thread_t thread = current_thread();
pcb_t pcb = thread->machine.pcb;
struct real_descriptor desc = {
.limit_low = 1,
.limit_high = 0,
.base_low = self & 0xffff,
.base_med = (self >> 16) & 0xff,
.base_high = (self >> 24) & 0xff,
.access = ACC_P|ACC_PL_U|ACC_DATA_W,
.granularity = SZ_32|SZ_G,
};
current_thread()->machine.pcb->cthread_self = (uint64_t) self; /* preserve old func too */
/* assign descriptor */
mp_disable_preemption();
pcb->cthread_desc = desc;
*ldt_desc_p(USER_CTHREAD) = desc;
saved_state32(pcb->iss)->gs = USER_CTHREAD;
mp_enable_preemption();
return (USER_CTHREAD);
}
/*
* thread_fast_set_cthread_self64: Sets the machine kernel thread ID of the
* current thread to the given thread ID; fast version for 64-bit processes
*
* Parameters: self Thread ID
*
* Returns: 0 Success
* !0 Not success
*/
kern_return_t
thread_fast_set_cthread_self64(uint64_t self)
{
pcb_t pcb = current_thread()->machine.pcb;
cpu_data_t *cdp;
/* check for canonical address, set 0 otherwise */
if (!IS_USERADDR64_CANONICAL(self))
self = 0ULL;
pcb->cthread_self = self;
mp_disable_preemption();
cdp = current_cpu_datap();
#if defined(__x86_64__)
if ((cdp->cpu_uber.cu_user_gs_base != pcb->cthread_self) ||
(pcb->cthread_self != rdmsr64(MSR_IA32_KERNEL_GS_BASE)))
wrmsr64(MSR_IA32_KERNEL_GS_BASE, self);
#endif
cdp->cpu_uber.cu_user_gs_base = self;
mp_enable_preemption();
return (USER_CTHREAD);
}
/*
* Function: unix_syscall
*
* Inputs: regs - pointer to i386 save area
*
* Outputs: none
*/
void
unix_syscall(x86_saved_state_t *state)
{
thread_t thread;
void *vt;
unsigned int code;
struct sysent *callp;
int error;
vm_offset_t params;
struct proc *p;
struct uthread *uthread;
x86_saved_state32_t *regs;
boolean_t is_vfork;
assert(is_saved_state32(state));
regs = saved_state32(state);
#if DEBUG
if (regs->eax == 0x800)
thread_exception_return();
#endif
thread = current_thread();
uthread = get_bsdthread_info(thread);
/* Get the approriate proc; may be different from task's for vfork() */
is_vfork = uthread->uu_flag & UT_VFORK;
if (__improbable(is_vfork != 0))
p = current_proc();
else
p = (struct proc *)get_bsdtask_info(current_task());
/* Verify that we are not being called from a task without a proc */
if (__improbable(p == NULL)) {
regs->eax = EPERM;
regs->efl |= EFL_CF;
task_terminate_internal(current_task());
thread_exception_return();
/* NOTREACHED */
}
code = regs->eax & I386_SYSCALL_NUMBER_MASK;
DEBUG_KPRINT_SYSCALL_UNIX("unix_syscall: code=%d(%s) eip=%u\n",
code, syscallnames[code >= NUM_SYSENT ? 63 : code], (uint32_t)regs->eip);
params = (vm_offset_t) (regs->uesp + sizeof (int));
regs->efl &= ~(EFL_CF);
callp = (code >= NUM_SYSENT) ? &sysent[63] : &sysent[code];
if (__improbable(callp == sysent)) {
code = fuword(params);
params += sizeof(int);
callp = (code >= NUM_SYSENT) ? &sysent[63] : &sysent[code];
}
vt = (void *)uthread->uu_arg;
if (callp->sy_arg_bytes != 0) {
#if CONFIG_REQUIRES_U32_MUNGING
sy_munge_t *mungerp;
#else
#error U32 syscalls on x86_64 kernel requires munging
#endif
uint32_t nargs;
assert((unsigned) callp->sy_arg_bytes <= sizeof (uthread->uu_arg));
nargs = callp->sy_arg_bytes;
error = copyin((user_addr_t) params, (char *) vt, nargs);
if (error) {
regs->eax = error;
regs->efl |= EFL_CF;
thread_exception_return();
/* NOTREACHED */
}
if (__probable(code != 180)) {
int *ip = (int *)vt;
KERNEL_DEBUG_CONSTANT_IST(KDEBUG_TRACE,
BSDDBG_CODE(DBG_BSD_EXCP_SC, code) | DBG_FUNC_START,
*ip, *(ip+1), *(ip+2), *(ip+3), 0);
}
#if CONFIG_REQUIRES_U32_MUNGING
mungerp = callp->sy_arg_munge32;
if (mungerp != NULL)
(*mungerp)(vt);
#endif
} else
KERNEL_DEBUG_CONSTANT_IST(KDEBUG_TRACE,
BSDDBG_CODE(DBG_BSD_EXCP_SC, code) | DBG_FUNC_START,
0, 0, 0, 0, 0);
/*
* Delayed binding of thread credential to process credential, if we
* are not running with an explicitly set thread credential.
*/
kauth_cred_uthread_update(uthread, p);
uthread->uu_rval[0] = 0;
uthread->uu_rval[1] = 0;
uthread->uu_flag |= UT_NOTCANCELPT;
uthread->syscall_code = code;
#ifdef JOE_DEBUG
uthread->uu_iocount = 0;
uthread->uu_vpindex = 0;
#endif
AUDIT_SYSCALL_ENTER(code, p, uthread);
error = (*(callp->sy_call))((void *) p, (void *) vt, &(uthread->uu_rval[0]));
AUDIT_SYSCALL_EXIT(code, p, uthread, error);
#ifdef JOE_DEBUG
if (uthread->uu_iocount)
printf("system call returned with uu_iocount != 0\n");
#endif
#if CONFIG_DTRACE
uthread->t_dtrace_errno = error;
#endif /* CONFIG_DTRACE */
if (__improbable(error == ERESTART)) {
/*
* Move the user's pc back to repeat the syscall:
* 5 bytes for a sysenter, or 2 for an int 8x.
* The SYSENTER_TF_CS covers single-stepping over a sysenter
* - see debug trap handler in idt.s/idt64.s
*/
pal_syscall_restart(thread, state);
}
else if (error != EJUSTRETURN) {
if (__improbable(error)) {
regs->eax = error;
regs->efl |= EFL_CF; /* carry bit */
} else { /* (not error) */
/*
* We split retval across two registers, in case the
* syscall had a 64-bit return value, in which case
* eax/edx matches the function call ABI.
*/
regs->eax = uthread->uu_rval[0];
regs->edx = uthread->uu_rval[1];
}
}
DEBUG_KPRINT_SYSCALL_UNIX(
"unix_syscall: error=%d retval=(%u,%u)\n",
error, regs->eax, regs->edx);
uthread->uu_flag &= ~UT_NOTCANCELPT;
if (__improbable(uthread->uu_lowpri_window)) {
/*
* task is marked as a low priority I/O type
* and the I/O we issued while in this system call
* collided with normal I/O operations... we'll
* delay in order to mitigate the impact of this
* task on the normal operation of the system
*/
throttle_lowpri_io(1);
}
if (__probable(code != 180))
KERNEL_DEBUG_CONSTANT_IST(KDEBUG_TRACE,
BSDDBG_CODE(DBG_BSD_EXCP_SC, code) | DBG_FUNC_END,
error, uthread->uu_rval[0], uthread->uu_rval[1], p->p_pid, 0);
if (__improbable(!is_vfork && callp->sy_call == (sy_call_t *)execve && !error)) {
pal_execve_return(thread);
}
thread_exception_return();
/* NOTREACHED */
}
void
unix_syscall_return(int error)
{
thread_t thread;
struct uthread *uthread;
struct proc *p;
unsigned int code;
struct sysent *callp;
thread = current_thread();
uthread = get_bsdthread_info(thread);
pal_register_cache_state(thread, DIRTY);
p = current_proc();
if (proc_is64bit(p)) {
x86_saved_state64_t *regs;
regs = saved_state64(find_user_regs(thread));
code = uthread->syscall_code;
callp = (code >= NUM_SYSENT) ? &sysent[63] : &sysent[code];
#if CONFIG_DTRACE
if (callp->sy_call == dtrace_systrace_syscall)
dtrace_systrace_syscall_return( code, error, uthread->uu_rval );
#endif /* CONFIG_DTRACE */
AUDIT_SYSCALL_EXIT(code, p, uthread, error);
if (error == ERESTART) {
/*
* repeat the syscall
*/
pal_syscall_restart( thread, find_user_regs(thread) );
}
else if (error != EJUSTRETURN) {
if (error) {
regs->rax = error;
regs->isf.rflags |= EFL_CF; /* carry bit */
} else { /* (not error) */
switch (callp->sy_return_type) {
case _SYSCALL_RET_INT_T:
regs->rax = uthread->uu_rval[0];
regs->rdx = uthread->uu_rval[1];
break;
case _SYSCALL_RET_UINT_T:
regs->rax = ((u_int)uthread->uu_rval[0]);
regs->rdx = ((u_int)uthread->uu_rval[1]);
break;
case _SYSCALL_RET_OFF_T:
case _SYSCALL_RET_ADDR_T:
case _SYSCALL_RET_SIZE_T:
case _SYSCALL_RET_SSIZE_T:
case _SYSCALL_RET_UINT64_T:
regs->rax = *((uint64_t *)(&uthread->uu_rval[0]));
regs->rdx = 0;
break;
case _SYSCALL_RET_NONE:
break;
default:
panic("unix_syscall: unknown return type");
break;
}
regs->isf.rflags &= ~EFL_CF;
}
}
DEBUG_KPRINT_SYSCALL_UNIX(
"unix_syscall_return: error=%d retval=(%llu,%llu)\n",
error, regs->rax, regs->rdx);
} else {
x86_saved_state32_t *regs;
regs = saved_state32(find_user_regs(thread));
regs->efl &= ~(EFL_CF);
code = uthread->syscall_code;
callp = (code >= NUM_SYSENT) ? &sysent[63] : &sysent[code];
#if CONFIG_DTRACE
if (callp->sy_call == dtrace_systrace_syscall)
dtrace_systrace_syscall_return( code, error, uthread->uu_rval );
#endif /* CONFIG_DTRACE */
AUDIT_SYSCALL_EXIT(code, p, uthread, error);
if (error == ERESTART) {
pal_syscall_restart( thread, find_user_regs(thread) );
}
else if (error != EJUSTRETURN) {
if (error) {
regs->eax = error;
regs->efl |= EFL_CF; /* carry bit */
} else { /* (not error) */
regs->eax = uthread->uu_rval[0];
regs->edx = uthread->uu_rval[1];
}
}
DEBUG_KPRINT_SYSCALL_UNIX(
"unix_syscall_return: error=%d retval=(%u,%u)\n",
error, regs->eax, regs->edx);
}
uthread->uu_flag &= ~UT_NOTCANCELPT;
if (uthread->uu_lowpri_window) {
/*
* task is marked as a low priority I/O type
* and the I/O we issued while in this system call
* collided with normal I/O operations... we'll
* delay in order to mitigate the impact of this
* task on the normal operation of the system
*/
throttle_lowpri_io(1);
}
if (code != 180)
KERNEL_DEBUG_CONSTANT_IST(KDEBUG_TRACE,
BSDDBG_CODE(DBG_BSD_EXCP_SC, code) | DBG_FUNC_END,
error, uthread->uu_rval[0], uthread->uu_rval[1], p->p_pid, 0);
thread_exception_return();
/* NOTREACHED */
}
void
mach_call_munger(x86_saved_state_t *state)
{
int argc;
int call_number;
mach_call_t mach_call;
kern_return_t retval;
struct mach_call_args args = { 0, 0, 0, 0, 0, 0, 0, 0, 0 };
x86_saved_state32_t *regs;
#if PROC_REF_DEBUG
struct uthread *ut = get_bsdthread_info(current_thread());
uthread_reset_proc_refcount(ut);
#endif
assert(is_saved_state32(state));
regs = saved_state32(state);
call_number = -(regs->eax);
DEBUG_KPRINT_SYSCALL_MACH(
"mach_call_munger: code=%d(%s)\n",
call_number, mach_syscall_name_table[call_number]);
#if DEBUG_TRACE
kprintf("mach_call_munger(0x%08x) code=%d\n", regs, call_number);
#endif
if (call_number < 0 || call_number >= mach_trap_count) {
i386_exception(EXC_SYSCALL, call_number, 1);
/* NOTREACHED */
}
mach_call = (mach_call_t)mach_trap_table[call_number].mach_trap_function;
if (mach_call == (mach_call_t)kern_invalid) {
DEBUG_KPRINT_SYSCALL_MACH(
"mach_call_munger: kern_invalid 0x%x\n", regs->eax);
i386_exception(EXC_SYSCALL, call_number, 1);
/* NOTREACHED */
}
argc = mach_trap_table[call_number].mach_trap_arg_count;
if (argc) {
retval = mach_call_arg_munger32(regs->uesp, &args, &mach_trap_table[call_number]);
if (retval != KERN_SUCCESS) {
regs->eax = retval;
DEBUG_KPRINT_SYSCALL_MACH(
"mach_call_munger: retval=0x%x\n", retval);
thread_exception_return();
/* NOTREACHED */
}
}
#ifdef MACH_BSD
mach_kauth_cred_uthread_update();
#endif
KERNEL_DEBUG_CONSTANT_IST(KDEBUG_TRACE,
MACHDBG_CODE(DBG_MACH_EXCP_SC, (call_number)) | DBG_FUNC_START,
args.arg1, args.arg2, args.arg3, args.arg4, 0);
retval = mach_call(&args);
DEBUG_KPRINT_SYSCALL_MACH("mach_call_munger: retval=0x%x\n", retval);
KERNEL_DEBUG_CONSTANT_IST(KDEBUG_TRACE,
MACHDBG_CODE(DBG_MACH_EXCP_SC,(call_number)) | DBG_FUNC_END,
retval, 0, 0, 0, 0);
regs->eax = retval;
throttle_lowpri_io(1);
#if PROC_REF_DEBUG
if (__improbable(uthread_get_proc_refcount(ut) != 0)) {
panic("system call returned with uu_proc_refcount != 0");
}
#endif
thread_exception_return();
/* NOTREACHED */
}
void
machdep_syscall(x86_saved_state_t *state)
{
int args[machdep_call_count];
int trapno;
int nargs;
const machdep_call_t *entry;
x86_saved_state32_t *regs;
assert(is_saved_state32(state));
regs = saved_state32(state);
trapno = regs->eax;
#if DEBUG_TRACE
kprintf("machdep_syscall(0x%08x) code=%d\n", regs, trapno);
#endif
DEBUG_KPRINT_SYSCALL_MDEP(
"machdep_syscall: trapno=%d\n", trapno);
if (trapno < 0 || trapno >= machdep_call_count) {
regs->eax = (unsigned int)kern_invalid(NULL);
thread_exception_return();
/* NOTREACHED */
}
entry = &machdep_call_table[trapno];
nargs = entry->nargs;
if (nargs != 0) {
if (copyin((user_addr_t) regs->uesp + sizeof (int),
(char *) args, (nargs * sizeof (int)))) {
regs->eax = KERN_INVALID_ADDRESS;
thread_exception_return();
/* NOTREACHED */
}
}
switch (nargs) {
case 0:
regs->eax = (*entry->routine.args_0)();
break;
case 1:
regs->eax = (*entry->routine.args_1)(args[0]);
break;
case 2:
regs->eax = (*entry->routine.args_2)(args[0],args[1]);
break;
case 3:
if (!entry->bsd_style)
regs->eax = (*entry->routine.args_3)(args[0],args[1],args[2]);
else {
int error;
uint32_t rval;
error = (*entry->routine.args_bsd_3)(&rval, args[0], args[1], args[2]);
if (error) {
regs->eax = error;
regs->efl |= EFL_CF; /* carry bit */
} else {
regs->eax = rval;
regs->efl &= ~EFL_CF;
}
}
break;
case 4:
regs->eax = (*entry->routine.args_4)(args[0], args[1], args[2], args[3]);
break;
default:
panic("machdep_syscall: too many args");
}
DEBUG_KPRINT_SYSCALL_MDEP("machdep_syscall: retval=%u\n", regs->eax);
throttle_lowpri_io(1);
thread_exception_return();
/* NOTREACHED */
}
static kern_return_t
dtrace_machtrace_syscall(struct mach_call_args *args)
{
int code; /* The mach call number */
machtrace_sysent_t *sy;
dtrace_id_t id;
kern_return_t rval;
#if 0 /* XXX */
proc_t *p;
#endif
syscall_arg_t *ip = (syscall_arg_t *)args;
mach_call_t mach_call;
#if defined (__x86_64__)
{
pal_register_cache_state(current_thread(), VALID);
x86_saved_state_t *tagged_regs = (x86_saved_state_t *)find_user_regs(current_thread());
if (is_saved_state64(tagged_regs)) {
code = saved_state64(tagged_regs)->rax & SYSCALL_NUMBER_MASK;
} else {
code = -saved_state32(tagged_regs)->eax;
}
}
#else
#error Unknown Architecture
#endif
sy = &machtrace_sysent[code];
if ((id = sy->stsy_entry) != DTRACE_IDNONE) {
uthread_t uthread = (uthread_t)get_bsdthread_info(current_thread());
if (uthread)
uthread->t_dtrace_syscall_args = (void *)ip;
(*machtrace_probe)(id, *ip, *(ip+1), *(ip+2), *(ip+3), *(ip+4));
if (uthread)
uthread->t_dtrace_syscall_args = (void *)0;
}
#if 0 /* XXX */
/*
* We want to explicitly allow DTrace consumers to stop a process
* before it actually executes the meat of the syscall.
*/
p = ttoproc(curthread);
mutex_enter(&p->p_lock);
if (curthread->t_dtrace_stop && !curthread->t_lwp->lwp_nostop) {
curthread->t_dtrace_stop = 0;
stop(PR_REQUESTED, 0);
}
mutex_exit(&p->p_lock);
#endif
mach_call = (mach_call_t)(*sy->stsy_underlying);
rval = mach_call(args);
if ((id = sy->stsy_return) != DTRACE_IDNONE)
(*machtrace_probe)(id, (uint64_t)rval, 0, 0, 0, 0);
return (rval);
}
int32_t
dtrace_systrace_syscall(struct proc *pp, void *uap, int *rv)
{
unsigned short code; /* The system call number */
systrace_sysent_t *sy;
dtrace_id_t id;
int32_t rval;
#if 0 /* XXX */
proc_t *p;
#endif
syscall_arg_t *ip = (syscall_arg_t *)uap;
#if defined (__x86_64__)
{
pal_register_cache_state(current_thread(), VALID);
x86_saved_state_t *tagged_regs = (x86_saved_state_t *)find_user_regs(current_thread());
if (is_saved_state64(tagged_regs)) {
x86_saved_state64_t *regs = saved_state64(tagged_regs);
code = regs->rax & SYSCALL_NUMBER_MASK;
/*
* Check for indirect system call... system call number
* passed as 'arg0'
*/
if (code == 0) {
code = regs->rdi;
}
} else {
code = saved_state32(tagged_regs)->eax & I386_SYSCALL_NUMBER_MASK;
if (code == 0) {
vm_offset_t params = (vm_offset_t) (saved_state32(tagged_regs)->uesp + sizeof (int));
code = fuword(params);
}
}
}
#else
#error Unknown Architecture
#endif
// Bounds "check" the value of code a la unix_syscall
sy = (code >= NUM_SYSENT) ? &systrace_sysent[63] : &systrace_sysent[code];
if ((id = sy->stsy_entry) != DTRACE_IDNONE) {
uthread_t uthread = (uthread_t)get_bsdthread_info(current_thread());
if (uthread)
uthread->t_dtrace_syscall_args = (void *)ip;
if (ip)
(*systrace_probe)(id, *ip, *(ip+1), *(ip+2), *(ip+3), *(ip+4));
else
(*systrace_probe)(id, 0, 0, 0, 0, 0);
if (uthread)
uthread->t_dtrace_syscall_args = (void *)0;
}
#if 0 /* XXX */
/*
* We want to explicitly allow DTrace consumers to stop a process
* before it actually executes the meat of the syscall.
*/
p = ttoproc(curthread);
mutex_enter(&p->p_lock);
if (curthread->t_dtrace_stop && !curthread->t_lwp->lwp_nostop) {
curthread->t_dtrace_stop = 0;
stop(PR_REQUESTED, 0);
}
mutex_exit(&p->p_lock);
#endif
rval = (*sy->stsy_underlying)(pp, uap, rv);
if ((id = sy->stsy_return) != DTRACE_IDNONE) {
uint64_t munged_rv0, munged_rv1;
uthread_t uthread = (uthread_t)get_bsdthread_info(current_thread());
if (uthread)
uthread->t_dtrace_errno = rval; /* Establish t_dtrace_errno now in case this enabling refers to it. */
/*
* "Decode" rv for use in the call to dtrace_probe()
*/
if (rval == ERESTART) {
munged_rv0 = -1LL; /* System call will be reissued in user mode. Make DTrace report a -1 return. */
munged_rv1 = -1LL;
} else if (rval != EJUSTRETURN) {
if (rval) {
munged_rv0 = -1LL; /* Mimic what libc will do. */
munged_rv1 = -1LL;
} else {
switch (sy->stsy_return_type) {
case _SYSCALL_RET_INT_T:
munged_rv0 = rv[0];
munged_rv1 = rv[1];
break;
case _SYSCALL_RET_UINT_T:
munged_rv0 = ((u_int)rv[0]);
munged_rv1 = ((u_int)rv[1]);
break;
case _SYSCALL_RET_OFF_T:
case _SYSCALL_RET_UINT64_T:
munged_rv0 = *(u_int64_t *)rv;
munged_rv1 = 0LL;
break;
case _SYSCALL_RET_ADDR_T:
case _SYSCALL_RET_SIZE_T:
case _SYSCALL_RET_SSIZE_T:
munged_rv0 = *(user_addr_t *)rv;
munged_rv1 = 0LL;
break;
case _SYSCALL_RET_NONE:
munged_rv0 = 0LL;
munged_rv1 = 0LL;
break;
default:
munged_rv0 = 0LL;
munged_rv1 = 0LL;
break;
}
}
} else {
munged_rv0 = 0LL;
munged_rv1 = 0LL;
}
/*
* <http://mail.opensolaris.org/pipermail/dtrace-discuss/2007-January/003276.html> says:
*
* "This is a bit of an historical artifact. At first, the syscall provider just
* had its return value in arg0, and the fbt and pid providers had their return
* values in arg1 (so that we could use arg0 for the offset of the return site).
*
* We inevitably started writing scripts where we wanted to see the return
* values from probes in all three providers, and we made this script easier
* to write by replicating the syscall return values in arg1 to match fbt and
* pid. We debated briefly about removing the return value from arg0, but
* decided that it would be less confusing to have the same data in two places
* than to have some non-helpful, non-intuitive value in arg0.
*
* This change was made 4/23/2003 according to the DTrace project's putback log."
*/
(*systrace_probe)(id, munged_rv0, munged_rv0, munged_rv1, (uint64_t)rval, 0);
}
return (rval);
}
kern_return_t
dtrace_user_probe(x86_saved_state_t *regs)
{
x86_saved_state64_t *regs64;
x86_saved_state32_t *regs32;
int trapno;
/*
* FIXME!
*
* The only call path into this method is always a user trap.
* We don't need to test for user trap, but should assert it.
*/
boolean_t user_mode = TRUE;
if (is_saved_state64(regs) == TRUE) {
regs64 = saved_state64(regs);
regs32 = NULL;
trapno = regs64->isf.trapno;
user_mode = TRUE; // By default, because xnu is 32 bit only
} else {
regs64 = NULL;
regs32 = saved_state32(regs);
if (regs32->cs & 0x03) user_mode = TRUE;
trapno = regs32->trapno;
}
lck_rw_t *rwp;
struct proc *p = current_proc();
uthread_t uthread = (uthread_t)get_bsdthread_info(current_thread());
if (user_mode /*|| (rp->r_ps & PS_VM)*/) {
/*
* DTrace accesses t_cred in probe context. t_cred
* must always be either NULL, or point to a valid,
* allocated cred structure.
*/
kauth_cred_uthread_update(uthread, p);
}
if (trapno == T_DTRACE_RET) {
uint8_t step = uthread->t_dtrace_step;
uint8_t ret = uthread->t_dtrace_ret;
user_addr_t npc = uthread->t_dtrace_npc;
if (uthread->t_dtrace_ast) {
printf("dtrace_user_probe() should be calling aston()\n");
// aston(uthread);
// uthread->t_sig_check = 1;
}
/*
* Clear all user tracing flags.
*/
uthread->t_dtrace_ft = 0;
/*
* If we weren't expecting to take a return probe trap, kill
* the process as though it had just executed an unassigned
* trap instruction.
*/
if (step == 0) {
/*
* APPLE NOTE: We're returning KERN_FAILURE, which causes
* the generic signal handling code to take over, which will effectively
* deliver a EXC_BAD_INSTRUCTION to the user process.
*/
return KERN_FAILURE;
}
/*
* If we hit this trap unrelated to a return probe, we're
* just here to reset the AST flag since we deferred a signal
* until after we logically single-stepped the instruction we
* copied out.
*/
if (ret == 0) {
if (regs64) {
regs64->isf.rip = npc;
} else {
regs32->eip = npc;
}
return KERN_SUCCESS;
}
/*
* We need to wait until after we've called the
* dtrace_return_probe_ptr function pointer to set %pc.
*/
rwp = &CPU->cpu_ft_lock;
lck_rw_lock_shared(rwp);
if (dtrace_return_probe_ptr != NULL)
(void) (*dtrace_return_probe_ptr)(regs);
lck_rw_unlock_shared(rwp);
if (regs64) {
regs64->isf.rip = npc;
} else {
regs32->eip = npc;
}
return KERN_SUCCESS;
} else if (trapno == T_INT3) {
uint8_t instr;
rwp = &CPU->cpu_ft_lock;
/*
* The DTrace fasttrap provider uses the breakpoint trap
* (int 3). We let DTrace take the first crack at handling
* this trap; if it's not a probe that DTrace knowns about,
* we call into the trap() routine to handle it like a
* breakpoint placed by a conventional debugger.
*/
/*
* APPLE NOTE: I believe the purpose of the reader/writers lock
* is thus: There are times which dtrace needs to prevent calling
* dtrace_pid_probe_ptr(). Sun's original impl grabbed a plain
* mutex here. However, that serialized all probe calls, and
* destroyed MP behavior. So now they use a RW lock, with probes
* as readers, and the top level synchronization as a writer.
*/
lck_rw_lock_shared(rwp);
if (dtrace_pid_probe_ptr != NULL &&
(*dtrace_pid_probe_ptr)(regs) == 0) {
lck_rw_unlock_shared(rwp);
return KERN_SUCCESS;
}
lck_rw_unlock_shared(rwp);
/*
* If the instruction that caused the breakpoint trap doesn't
* look like an int 3 anymore, it may be that this tracepoint
* was removed just after the user thread executed it. In
* that case, return to user land to retry the instuction.
*/
user_addr_t pc = (regs64) ? regs64->isf.rip : (user_addr_t)regs32->eip;
if (fuword8(pc - 1, &instr) == 0 && instr != FASTTRAP_INSTR) {
if (regs64) {
regs64->isf.rip--;
} else {
regs32->eip--;
}
return KERN_SUCCESS;
}
}
return KERN_FAILURE;
}
static kern_return_t do_kernel_backtrace(
thread_t thread,
struct x86_kernel_state *regs,
uint64_t *frames,
mach_msg_type_number_t *start_idx,
mach_msg_type_number_t max_idx)
{
uint64_t kernStackMin = (uint64_t)thread->kernel_stack;
uint64_t kernStackMax = (uint64_t)kernStackMin + kernel_stack_size;
mach_msg_type_number_t ct = *start_idx;
kern_return_t kr = KERN_FAILURE;
#if __LP64__
uint64_t currPC = 0ULL;
uint64_t currFP = 0ULL;
uint64_t prevPC = 0ULL;
uint64_t prevFP = 0ULL;
if(KERN_SUCCESS != chudxnu_kern_read(&currPC, (vm_offset_t)&(regs->k_rip), sizeof(uint64_t))) {
return KERN_FAILURE;
}
if(KERN_SUCCESS != chudxnu_kern_read(&currFP, (vm_offset_t)&(regs->k_rbp), sizeof(uint64_t))) {
return KERN_FAILURE;
}
#else
uint32_t currPC = 0U;
uint32_t currFP = 0U;
uint32_t prevPC = 0U;
uint32_t prevFP = 0U;
if(KERN_SUCCESS != chudxnu_kern_read(&currPC, (vm_offset_t)&(regs->k_eip), sizeof(uint32_t))) {
return KERN_FAILURE;
}
if(KERN_SUCCESS != chudxnu_kern_read(&currFP, (vm_offset_t)&(regs->k_ebp), sizeof(uint32_t))) {
return KERN_FAILURE;
}
#endif
if(*start_idx >= max_idx)
return KERN_RESOURCE_SHORTAGE; // no frames traced
if(!currPC) {
return KERN_FAILURE;
}
frames[ct++] = (uint64_t)currPC;
// build a backtrace of this kernel state
#if __LP64__
while(VALID_STACK_ADDRESS64(TRUE, currFP, kernStackMin, kernStackMax)) {
// this is the address where caller lives in the user thread
uint64_t caller = currFP + sizeof(uint64_t);
#else
while(VALID_STACK_ADDRESS(TRUE, currFP, kernStackMin, kernStackMax)) {
uint32_t caller = (uint32_t)currFP + sizeof(uint32_t);
#endif
if(!currFP || !currPC) {
currPC = 0;
break;
}
if(ct >= max_idx) {
*start_idx = ct;
return KERN_RESOURCE_SHORTAGE;
}
/* read our caller */
kr = chudxnu_kern_read(&currPC, (vm_offset_t)caller, sizeof(currPC));
if(kr != KERN_SUCCESS || !currPC) {
currPC = 0UL;
break;
}
/*
* retrive contents of the frame pointer and advance to the next stack
* frame if it's valid
*/
prevFP = 0;
kr = chudxnu_kern_read(&prevFP, (vm_offset_t)currFP, sizeof(currPC));
#if __LP64__
if(VALID_STACK_ADDRESS64(TRUE, prevFP, kernStackMin, kernStackMax)) {
#else
if(VALID_STACK_ADDRESS(TRUE, prevFP, kernStackMin, kernStackMax)) {
#endif
frames[ct++] = (uint64_t)currPC;
prevPC = currPC;
}
if(prevFP <= currFP) {
break;
} else {
currFP = prevFP;
}
}
*start_idx = ct;
return KERN_SUCCESS;
}
__private_extern__
kern_return_t chudxnu_thread_get_callstack64(
thread_t thread,
uint64_t *callstack,
mach_msg_type_number_t *count,
boolean_t user_only)
{
kern_return_t kr = KERN_FAILURE;
task_t task = thread->task;
uint64_t currPC = 0ULL;
boolean_t supervisor = FALSE;
mach_msg_type_number_t bufferIndex = 0;
mach_msg_type_number_t bufferMaxIndex = *count;
x86_saved_state_t *tagged_regs = NULL; // kernel register state
x86_saved_state64_t *regs64 = NULL;
x86_saved_state32_t *regs32 = NULL;
x86_saved_state32_t *u_regs32 = NULL;
x86_saved_state64_t *u_regs64 = NULL;
struct x86_kernel_state *kregs = NULL;
if(ml_at_interrupt_context()) {
if(user_only) {
/* can't backtrace user state on interrupt stack. */
return KERN_FAILURE;
}
/* backtracing at interrupt context? */
if(thread == current_thread() && current_cpu_datap()->cpu_int_state) {
/*
* Locate the registers for the interrupted thread, assuming it is
* current_thread().
*/
tagged_regs = current_cpu_datap()->cpu_int_state;
if(is_saved_state64(tagged_regs)) {
/* 64 bit registers */
regs64 = saved_state64(tagged_regs);
supervisor = ((regs64->isf.cs & SEL_PL) != SEL_PL_U);
} else {
/* 32 bit registers */
regs32 = saved_state32(tagged_regs);
supervisor = ((regs32->cs & SEL_PL) != SEL_PL_U);
}
}
}
if(!ml_at_interrupt_context() && kernel_task == task) {
if(!thread->kernel_stack) {
return KERN_FAILURE;
}
// Kernel thread not at interrupt context
kregs = (struct x86_kernel_state *)NULL;
// nofault read of the thread->kernel_stack pointer
if(KERN_SUCCESS != chudxnu_kern_read(&kregs, (vm_offset_t)&(thread->kernel_stack), sizeof(void *))) {
return KERN_FAILURE;
}
// Adjust to find the saved kernel state
kregs = STACK_IKS((vm_offset_t)(uintptr_t)kregs);
supervisor = TRUE;
} else if(!tagged_regs) {
/*
* not at interrupt context, or tracing a different thread than
* current_thread() at interrupt context
*/
tagged_regs = USER_STATE(thread);
if(is_saved_state64(tagged_regs)) {
/* 64 bit registers */
regs64 = saved_state64(tagged_regs);
supervisor = ((regs64->isf.cs & SEL_PL) != SEL_PL_U);
} else {
/* 32 bit registers */
regs32 = saved_state32(tagged_regs);
supervisor = ((regs32->cs & SEL_PL) != SEL_PL_U);
}
}
*count = 0;
if(supervisor) {
// the caller only wants a user callstack.
if(user_only) {
// bail - we've only got kernel state
return KERN_FAILURE;
}
} else {
// regs32(64) is not in supervisor mode.
u_regs32 = regs32;
u_regs64 = regs64;
regs32 = NULL;
regs64 = NULL;
}
if (user_only) {
/* we only want to backtrace the user mode */
if(!(u_regs32 || u_regs64)) {
/* no user state to look at */
return KERN_FAILURE;
}
}
/*
* Order of preference for top of stack:
* 64 bit kernel state (not likely)
* 32 bit kernel state
* 64 bit user land state
* 32 bit user land state
*/
if(kregs) {
/*
* nofault read of the registers from the kernel stack (as they can
* disappear on the fly).
*/
#if __LP64__
if(KERN_SUCCESS != chudxnu_kern_read(&currPC, (vm_offset_t)&(kregs->k_rip), sizeof(uint64_t))) {
return KERN_FAILURE;
}
#else
uint32_t tmp;
if(KERN_SUCCESS != chudxnu_kern_read(&tmp, (vm_offset_t)&(kregs->k_eip), sizeof(uint32_t))) {
return KERN_FAILURE;
}
currPC = (uint64_t)tmp;
#endif
} else if(regs64) {
currPC = regs64->isf.rip;
} else if(regs32) {
currPC = (uint64_t) regs32->eip;
} else if(u_regs64) {
currPC = u_regs64->isf.rip;
} else if(u_regs32) {
currPC = (uint64_t) u_regs32->eip;
}
if(!currPC) {
/* no top of the stack, bail out */
return KERN_FAILURE;
}
bufferIndex = 0;
if(bufferMaxIndex < 1) {
*count = 0;
return KERN_RESOURCE_SHORTAGE;
}
/* backtrace kernel */
if(kregs) {
addr64_t address = 0ULL;
size_t size = 0UL;
// do the backtrace
kr = do_kernel_backtrace(thread, kregs, callstack, &bufferIndex, bufferMaxIndex);
// and do a nofault read of (r|e)sp
#if __LP64__
uint64_t rsp = 0ULL;
size = sizeof(uint64_t);
if(KERN_SUCCESS != chudxnu_kern_read(&address, (vm_offset_t)&(kregs->k_rsp), size)) {
address = 0ULL;
}
#else
uint32_t rsp = 0ULL, tmp = 0ULL;
size = sizeof(uint32_t);
if(KERN_SUCCESS != chudxnu_kern_read(&tmp, (vm_offset_t)&(kregs->k_esp), size)) {
address = 0ULL;
} else {
address = (addr64_t)tmp;
}
#endif
if(address && KERN_SUCCESS == chudxnu_kern_read(&rsp, (vm_offset_t)address, size) && bufferIndex < bufferMaxIndex) {
callstack[bufferIndex++] = (uint64_t)rsp;
}
} else if(regs64) {
uint64_t rsp = 0ULL;
// backtrace the 64bit side.
kr = do_backtrace64(task, thread, regs64, callstack, &bufferIndex,
bufferMaxIndex, TRUE);
if(KERN_SUCCESS == chudxnu_kern_read(&rsp, (vm_offset_t) regs64->isf.rsp, sizeof(uint64_t)) &&
bufferIndex < bufferMaxIndex) {
callstack[bufferIndex++] = rsp;
}
} else if(regs32) {
uint32_t esp = 0UL;
// backtrace the 32bit side.
kr = do_backtrace32(task, thread, regs32, callstack, &bufferIndex,
bufferMaxIndex, TRUE);
if(KERN_SUCCESS == chudxnu_kern_read(&esp, (vm_offset_t) regs32->uesp, sizeof(uint32_t)) &&
bufferIndex < bufferMaxIndex) {
callstack[bufferIndex++] = (uint64_t) esp;
}
} else if(u_regs64) {
/* backtrace user land */
uint64_t rsp = 0ULL;
kr = do_backtrace64(task, thread, u_regs64, callstack, &bufferIndex,
bufferMaxIndex, FALSE);
if(KERN_SUCCESS == chudxnu_task_read(task, &rsp, (addr64_t) u_regs64->isf.rsp, sizeof(uint64_t)) &&
bufferIndex < bufferMaxIndex) {
callstack[bufferIndex++] = rsp;
}
} else if(u_regs32) {
uint32_t esp = 0UL;
kr = do_backtrace32(task, thread, u_regs32, callstack, &bufferIndex,
bufferMaxIndex, FALSE);
if(KERN_SUCCESS == chudxnu_task_read(task, &esp, (addr64_t) u_regs32->uesp, sizeof(uint32_t)) &&
bufferIndex < bufferMaxIndex) {
callstack[bufferIndex++] = (uint64_t) esp;
}
}
*count = bufferIndex;
return kr;
}
void
mach_call_munger(x86_saved_state_t *state)
{
int argc;
int call_number;
mach_call_t mach_call;
kern_return_t retval;
struct mach_call_args args = { 0, 0, 0, 0, 0, 0, 0, 0, 0 };
x86_saved_state32_t *regs;
assert(is_saved_state32(state));
regs = saved_state32(state);
call_number = -(regs->eax);
DEBUG_KPRINT_SYSCALL_MACH(
"mach_call_munger: code=%d(%s)\n",
call_number, mach_syscall_name_table[call_number]);
#if DEBUG_TRACE
kprintf("mach_call_munger(0x%08x) code=%d\n", regs, call_number);
#endif
if (call_number < 0 || call_number >= mach_trap_count) {
i386_exception(EXC_SYSCALL, call_number, 1);
/* NOTREACHED */
}
mach_call = (mach_call_t)mach_trap_table[call_number].mach_trap_function;
if (mach_call == (mach_call_t)kern_invalid) {
DEBUG_KPRINT_SYSCALL_MACH(
"mach_call_munger: kern_invalid 0x%x\n", regs->eax);
i386_exception(EXC_SYSCALL, call_number, 1);
/* NOTREACHED */
}
argc = mach_trap_table[call_number].mach_trap_arg_count;
if (argc) {
retval = mach_call_arg_munger32(regs->uesp, argc, call_number, &args);
if (retval != KERN_SUCCESS) {
regs->eax = retval;
DEBUG_KPRINT_SYSCALL_MACH(
"mach_call_munger: retval=0x%x\n", retval);
thread_exception_return();
/* NOTREACHED */
}
}
#ifdef MACH_BSD
mach_kauth_cred_uthread_update();
#endif
KERNEL_DEBUG_CONSTANT(MACHDBG_CODE(DBG_MACH_EXCP_SC, (call_number)) | DBG_FUNC_START,
args.arg1, args.arg2, args.arg3, args.arg4, 0);
retval = mach_call(&args);
DEBUG_KPRINT_SYSCALL_MACH("mach_call_munger: retval=0x%x\n", retval);
KERNEL_DEBUG_CONSTANT(MACHDBG_CODE(DBG_MACH_EXCP_SC,(call_number)) | DBG_FUNC_END,
retval, 0, 0, 0, 0);
regs->eax = retval;
throttle_lowpri_io(TRUE);
thread_exception_return();
/* NOTREACHED */
}
void
panic_64(x86_saved_state_t *sp, __unused int pc, __unused const char *msg, boolean_t do_mca_dump)
{
/* Set postcode (DEBUG only) */
postcode(pc);
/*
* Issue an I/O port read if one has been requested - this is an
* event logic analyzers can use as a trigger point.
*/
panic_io_port_read();
/*
* Break kprintf lock in case of recursion,
* and record originally faulted instruction address.
*/
kprintf_break_lock();
if (do_mca_dump) {
#if CONFIG_MCA
/*
* Dump the contents of the machine check MSRs (if any).
*/
mca_dump();
#endif
}
#ifdef __i386__
/*
* Dump the interrupt stack frame at last kernel entry.
*/
if (is_saved_state64(sp)) {
x86_saved_state64_t *ss64p = saved_state64(sp);
panic("%s trapno:0x%x, err:0x%qx, "
"registers:\n"
"CR0: 0x%08x, CR2: 0x%08x, CR3: 0x%08x, CR4: 0x%08x\n"
"RAX: 0x%016qx, RBX: 0x%016qx, RCX: 0x%016qx, RDX: 0x%016qx\n"
"RSP: 0x%016qx, RBP: 0x%016qx, RSI: 0x%016qx, RDI: 0x%016qx\n"
"R8: 0x%016qx, R9: 0x%016qx, R10: 0x%016qx, R11: 0x%016qx\n"
"R12: 0x%016qx, R13: 0x%016qx, R14: 0x%016qx, R15: 0x%016qx\n"
"RFL: 0x%016qx, RIP: 0x%016qx, CR2: 0x%016qx%s\n",
msg,
ss64p->isf.trapno, ss64p->isf.err,
(uint32_t)get_cr0(), (uint32_t)get_cr2(), (uint32_t)get_cr3(), (uint32_t)get_cr4(),
ss64p->rax, ss64p->rbx, ss64p->rcx, ss64p->rdx,
ss64p->isf.rsp, ss64p->rbp, ss64p->rsi, ss64p->rdi,
ss64p->r8, ss64p->r9, ss64p->r10, ss64p->r11,
ss64p->r12, ss64p->r13, ss64p->r14, ss64p->r15,
ss64p->isf.rflags, ss64p->isf.rip, ss64p->cr2,
virtualized ? " VMM" : "");
} else {
x86_saved_state32_t *ss32p = saved_state32(sp);
panic("%s at 0x%08x, trapno:0x%x, err:0x%x,"
"registers:\n"
"CR0: 0x%08x, CR2: 0x%08x, CR3: 0x%08x, CR4: 0x%08x\n"
"EAX: 0x%08x, EBX: 0x%08x, ECX: 0x%08x, EDX: 0x%08x\n"
"ESP: 0x%08x, EBP: 0x%08x, ESI: 0x%08x, EDI: 0x%08x\n"
"EFL: 0x%08x, EIP: 0x%08x%s\n",
msg,
ss32p->eip, ss32p->trapno, ss32p->err,
(uint32_t)get_cr0(), (uint32_t)get_cr2(), (uint32_t)get_cr3(), (uint32_t)get_cr4(),
ss32p->eax, ss32p->ebx, ss32p->ecx, ss32p->edx,
ss32p->uesp, ss32p->ebp, ss32p->esi, ss32p->edi,
ss32p->efl, ss32p->eip, virtualized ? " VMM" : "");
}
#else
x86_saved_state64_t *regs = saved_state64(sp);
panic("%s at 0x%016llx, registers:\n"
"CR0: 0x%016lx, CR2: 0x%016lx, CR3: 0x%016lx, CR4: 0x%016lx\n"
"RAX: 0x%016llx, RBX: 0x%016llx, RCX: 0x%016llx, RDX: 0x%016llx\n"
"RSP: 0x%016llx, RBP: 0x%016llx, RSI: 0x%016llx, RDI: 0x%016llx\n"
"R8: 0x%016llx, R9: 0x%016llx, R10: 0x%016llx, R11: 0x%016llx\n"
"R12: 0x%016llx, R13: 0x%016llx, R14: 0x%016llx, R15: 0x%016llx\n"
"RFL: 0x%016llx, RIP: 0x%016llx, CS: 0x%016llx, SS: 0x%016llx\n"
"Error code: 0x%016llx%s\n",
msg,
regs->isf.rip,
get_cr0(), get_cr2(), get_cr3_raw(), get_cr4(),
regs->rax, regs->rbx, regs->rcx, regs->rdx,
regs->isf.rsp, regs->rbp, regs->rsi, regs->rdi,
regs->r8, regs->r9, regs->r10, regs->r11,
regs->r12, regs->r13, regs->r14, regs->r15,
regs->isf.rflags, regs->isf.rip, regs->isf.cs & 0xFFFF, regs->isf.ss & 0xFFFF,
regs->isf.err, virtualized ? " VMM" : "");
#endif
}
int
diagCall(x86_saved_state_t * state)
{
uint32_t stk, curpos, i, j;
uint32_t selector, data;
int err;
uint64_t currNap, durNap;
x86_saved_state32_t *regs;
assert(is_saved_state32(state));
regs = saved_state32(state);
if (!(dgWork.dgFlags & enaDiagSCs))
return 0; /* If not enabled, cause an exception */
stk = regs->uesp; /* Point to the stack */
err = copyin((user_addr_t) (stk + 4), (char *) &selector, sizeof(uint32_t)); /* Get the selector */
if (err) {
return 0; /* Failed to fetch stack */
}
switch (selector) { /* Select the routine */
case dgRuptStat: /* Suck Interruption statistics */
err = copyin((user_addr_t) (stk + 8), (char *) &data, sizeof(uint32_t)); /* Get the selector */
if (data == 0) {/* If number of processors is 0, clear all
* counts */
for (i = 0; i < real_ncpus; i++) { /* Cycle through
* processors */
for (j = 0; j < 256; j++)
cpu_data_ptr[i]->cpu_hwIntCnt[j] = 0;
}
lastRuptClear = mach_absolute_time(); /* Get the time of clear */
return 1; /* Normal return */
}
(void) copyout((char *) &real_ncpus, data, sizeof(real_ncpus)); /* Copy out number of
* processors */
currNap = mach_absolute_time(); /* Get the time now */
durNap = currNap - lastRuptClear; /* Get the last interval
* duration */
if (durNap == 0)
durNap = 1; /* This is a very short time, make it
* bigger */
curpos = data + sizeof(real_ncpus); /* Point to the next
* available spot */
for (i = 0; i < real_ncpus; i++) { /* Move 'em all out */
(void) copyout((char *) &durNap, curpos, 8); /* Copy out the time
* since last clear */
(void) copyout((char *) &cpu_data_ptr[i]->cpu_hwIntCnt, curpos + 8, 256 * sizeof(uint32_t)); /* Copy out interrupt
* data for this
* processor */
curpos = curpos + (256 * sizeof(uint32_t) + 8); /* Point to next out put
* slot */
}
break;
default: /* Handle invalid ones */
return 0; /* Return an exception */
}
return 1; /* Normal non-ast check return */
}
