X-Git-Url: https://git.saurik.com/apple/xnu.git/blobdiff_plain/55e303ae13a4cf49d70f2294092726f2fffb9ef2..4b17d6b6e417f714551ec129064745ea9919780e:/osfmk/kern/exception.c diff --git a/osfmk/kern/exception.c b/osfmk/kern/exception.c index 75a4df259..8df6e268b 100644 --- a/osfmk/kern/exception.c +++ b/osfmk/kern/exception.c @@ -1,16 +1,19 @@ /* - * Copyright (c) 2000 Apple Computer, Inc. All rights reserved. + * Copyright (c) 2000-2004 Apple Computer, Inc. All rights reserved. * - * @APPLE_LICENSE_HEADER_START@ - * - * Copyright (c) 1999-2003 Apple Computer, Inc. All Rights Reserved. + * @APPLE_OSREFERENCE_LICENSE_HEADER_START@ * * This file contains Original Code and/or Modifications of Original Code * as defined in and that are subject to the Apple Public Source License * Version 2.0 (the 'License'). You may not use this file except in - * compliance with the License. Please obtain a copy of the License at - * http://www.opensource.apple.com/apsl/ and read it before using this - * file. + * compliance with the License. The rights granted to you under the License + * may not be used to create, or enable the creation or redistribution of, + * unlawful or unlicensed copies of an Apple operating system, or to + * circumvent, violate, or enable the circumvention or violation of, any + * terms of an Apple operating system software license agreement. + * + * Please obtain a copy of the License at + * http://www.opensource.apple.com/apsl/ and read it before using this file. * * The Original Code and all software distributed under the License are * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER @@ -20,7 +23,7 @@ * Please see the License for the specific language governing rights and * limitations under the License. * - * @APPLE_LICENSE_HEADER_END@ + * @APPLE_OSREFERENCE_LICENSE_HEADER_END@ */ /* * @OSF_COPYRIGHT@ @@ -53,16 +56,17 @@ /* */ -#include - #include #include #include #include #include #include +#include #include #include +#include +#include #include #include #include @@ -70,35 +74,17 @@ #include #include #include -#include #include #include #include #include -#include #include #include #include #include #include #include -#include - -#if MACH_KDB -#include -#endif /* MACH_KDB */ - -#if MACH_KDB - -#include - -#if iPSC386 || iPSC860 -boolean_t debug_user_with_kdb = TRUE; -#else -boolean_t debug_user_with_kdb = FALSE; -#endif - -#endif /* MACH_KDB */ +#include unsigned long c_thr_exc_raise = 0; unsigned long c_thr_exc_raise_state = 0; @@ -107,6 +93,21 @@ unsigned long c_tsk_exc_raise = 0; unsigned long c_tsk_exc_raise_state = 0; unsigned long c_tsk_exc_raise_state_id = 0; +/* forward declarations */ +kern_return_t exception_deliver( + thread_t thread, + exception_type_t exception, + mach_exception_data_t code, + mach_msg_type_number_t codeCnt, + struct exception_action *excp, + lck_mtx_t *mutex); + +#ifdef MACH_BSD +kern_return_t bsd_exception( + exception_type_t exception, + mach_exception_data_t code, + mach_msg_type_number_t codeCnt); +#endif /* MACH_BSD */ /* * Routine: exception_deliver @@ -118,18 +119,20 @@ unsigned long c_tsk_exc_raise_state_id = 0; * thread_exception_return and thread_kdb_return * are possible. * Returns: - * If the exception was not handled by this handler + * KERN_SUCCESS if the exception was handled */ -void +kern_return_t exception_deliver( + thread_t thread, exception_type_t exception, - exception_data_t code, + mach_exception_data_t code, mach_msg_type_number_t codeCnt, struct exception_action *excp, - mutex_t *mutex) + lck_mtx_t *mutex) { - thread_act_t a_self = current_act(); ipc_port_t exc_port; + exception_data_type_t small_code[EXCEPTION_CODE_MAX]; + int code64; int behavior; int flavor; kern_return_t kr; @@ -138,8 +141,8 @@ exception_deliver( * Save work if we are terminating. * Just go back to our AST handler. */ - if (!a_self->active) - thread_exception_return(); + if (!thread->active) + return KERN_SUCCESS; /* * Snapshot the exception action data under lock for consistency. @@ -148,17 +151,17 @@ exception_deliver( * the port from disappearing between now and when * ipc_object_copyin_from_kernel is finally called. */ - mutex_lock(mutex); + lck_mtx_lock(mutex); exc_port = excp->port; if (!IP_VALID(exc_port)) { - mutex_unlock(mutex); - return; + lck_mtx_unlock(mutex); + return KERN_FAILURE; } ip_lock(exc_port); if (!ip_active(exc_port)) { ip_unlock(exc_port); - mutex_unlock(mutex); - return; + lck_mtx_unlock(mutex); + return KERN_FAILURE; } ip_reference(exc_port); exc_port->ip_srights++; @@ -166,7 +169,16 @@ exception_deliver( flavor = excp->flavor; behavior = excp->behavior; - mutex_unlock(mutex); + lck_mtx_unlock(mutex); + + code64 = (behavior & MACH_EXCEPTION_CODES); + behavior &= ~MACH_EXCEPTION_CODES; + + if (!code64) { + small_code[0] = CAST_DOWN_EXPLICIT(exception_data_type_t, code[0]); + small_code[1] = CAST_DOWN_EXPLICIT(exception_data_type_t, code[1]); + } + switch (behavior) { case EXCEPTION_STATE: { @@ -174,73 +186,100 @@ exception_deliver( thread_state_data_t state; c_thr_exc_raise_state++; - state_cnt = state_count[flavor]; - kr = thread_getstatus(a_self, flavor, + state_cnt = _MachineStateCount[flavor]; + kr = thread_getstatus(thread, flavor, (thread_state_t)state, &state_cnt); if (kr == KERN_SUCCESS) { - kr = exception_raise_state(exc_port, exception, - code, codeCnt, - &flavor, - state, state_cnt, - state, &state_cnt); + if (code64) { + kr = mach_exception_raise_state(exc_port, + exception, + code, + codeCnt, + &flavor, + state, state_cnt, + state, &state_cnt); + } else { + kr = exception_raise_state(exc_port, exception, + small_code, + codeCnt, + &flavor, + state, state_cnt, + state, &state_cnt); + } if (kr == MACH_MSG_SUCCESS) - kr = thread_setstatus(a_self, flavor, - (thread_state_t)state, - state_cnt); + kr = thread_setstatus(thread, flavor, + (thread_state_t)state, + state_cnt); } - if (kr == KERN_SUCCESS || kr == MACH_RCV_PORT_DIED) - thread_exception_return(); - /*NOTREACHED*/ - return; + return kr; } case EXCEPTION_DEFAULT: c_thr_exc_raise++; - kr = exception_raise(exc_port, - retrieve_act_self_fast(a_self), - retrieve_task_self_fast(a_self->task), - exception, - code, codeCnt); + if (code64) { + kr = mach_exception_raise(exc_port, + retrieve_thread_self_fast(thread), + retrieve_task_self_fast(thread->task), + exception, + code, + codeCnt); + } else { + kr = exception_raise(exc_port, + retrieve_thread_self_fast(thread), + retrieve_task_self_fast(thread->task), + exception, + small_code, + codeCnt); + } - if (kr == KERN_SUCCESS || kr == MACH_RCV_PORT_DIED) - thread_exception_return(); - /*NOTREACHED*/ - return; + return kr; case EXCEPTION_STATE_IDENTITY: { mach_msg_type_number_t state_cnt; thread_state_data_t state; c_thr_exc_raise_state_id++; - state_cnt = state_count[flavor]; - kr = thread_getstatus(a_self, flavor, + state_cnt = _MachineStateCount[flavor]; + kr = thread_getstatus(thread, flavor, (thread_state_t)state, &state_cnt); if (kr == KERN_SUCCESS) { - kr = exception_raise_state_identity(exc_port, - retrieve_act_self_fast(a_self), - retrieve_task_self_fast(a_self->task), - exception, - code, codeCnt, - &flavor, - state, state_cnt, - state, &state_cnt); - if (kr == MACH_MSG_SUCCESS) - kr = thread_setstatus(a_self, flavor, - (thread_state_t)state, - state_cnt); + if (code64) { + kr = mach_exception_raise_state_identity( + exc_port, + retrieve_thread_self_fast(thread), + retrieve_task_self_fast(thread->task), + exception, + code, + codeCnt, + &flavor, + state, state_cnt, + state, &state_cnt); + } else { + kr = exception_raise_state_identity(exc_port, + retrieve_thread_self_fast(thread), + retrieve_task_self_fast(thread->task), + exception, + small_code, + codeCnt, + &flavor, + state, state_cnt, + state, &state_cnt); + } + if (kr == MACH_MSG_SUCCESS) + kr = thread_setstatus(thread, flavor, + (thread_state_t)state, + state_cnt); } - if (kr == KERN_SUCCESS || kr == MACH_RCV_PORT_DIED) - thread_exception_return(); - /*NOTREACHED*/ - return; + return kr; } - + default: - panic ("bad exception behavior!"); + panic ("bad exception behavior!"); + return KERN_FAILURE; }/* switch */ } @@ -258,262 +297,149 @@ exception_deliver( * Doesn't return. */ void -exception( +exception_triage( exception_type_t exception, - exception_data_t code, + mach_exception_data_t code, mach_msg_type_number_t codeCnt) { - thread_act_t thr_act; + thread_t thread; task_t task; host_priv_t host_priv; struct exception_action *excp; - mutex_t *mutex; + lck_mtx_t *mutex; + kern_return_t kr; assert(exception != EXC_RPC_ALERT); - if (exception == KERN_SUCCESS) - panic("exception"); + thread = current_thread(); /* * Try to raise the exception at the activation level. */ - thr_act = current_act(); - mutex = mutex_addr(thr_act->lock); - excp = &thr_act->exc_actions[exception]; - exception_deliver(exception, code, codeCnt, excp, mutex); + mutex = &thread->mutex; + excp = &thread->exc_actions[exception]; + kr = exception_deliver(thread, exception, code, codeCnt, excp, mutex); + if (kr == KERN_SUCCESS || kr == MACH_RCV_PORT_DIED) + goto out; /* * Maybe the task level will handle it. */ task = current_task(); - mutex = mutex_addr(task->lock); + mutex = &task->lock; excp = &task->exc_actions[exception]; - exception_deliver(exception, code, codeCnt, excp, mutex); + kr = exception_deliver(thread, exception, code, codeCnt, excp, mutex); + if (kr == KERN_SUCCESS || kr == MACH_RCV_PORT_DIED) + goto out; /* * How about at the host level? */ host_priv = host_priv_self(); - mutex = mutex_addr(host_priv->lock); + mutex = &host_priv->lock; excp = &host_priv->exc_actions[exception]; - exception_deliver(exception, code, codeCnt, excp, mutex); + kr = exception_deliver(thread, exception, code, codeCnt, excp, mutex); + if (kr == KERN_SUCCESS || kr == MACH_RCV_PORT_DIED) + goto out; /* * Nobody handled it, terminate the task. */ -#if MACH_KDB - if (debug_user_with_kdb) { - /* - * Debug the exception with kdb. - * If kdb handles the exception, - * then thread_kdb_return won't return. - */ - db_printf("No exception server, calling kdb...\n"); - thread_kdb_return(); - } -#endif /* MACH_KDB */ - (void) task_terminate(task); - thread_exception_return(); - /*NOTREACHED*/ + +out: + if ((exception != EXC_CRASH) && (exception != EXC_RESOURCE)) + thread_exception_return(); + return; } kern_return_t bsd_exception( exception_type_t exception, - exception_data_t code, + mach_exception_data_t code, mach_msg_type_number_t codeCnt) { task_t task; - host_priv_t host_priv; struct exception_action *excp; - mutex_t *mutex; - thread_act_t a_self = current_act(); - ipc_port_t exc_port; - int behavior; - int flavor; + lck_mtx_t *mutex; + thread_t self = current_thread(); kern_return_t kr; /* * Maybe the task level will handle it. */ task = current_task(); - mutex = mutex_addr(task->lock); + mutex = &task->lock; excp = &task->exc_actions[exception]; - /* - * Save work if we are terminating. - * Just go back to our AST handler. - */ - if (!a_self->active) { - return(KERN_FAILURE); - } + kr = exception_deliver(self, exception, code, codeCnt, excp, mutex); - /* - * Snapshot the exception action data under lock for consistency. - * Hold a reference to the port over the exception_raise_* calls - * so it can't be destroyed. This seems like overkill, but keeps - * the port from disappearing between now and when - * ipc_object_copyin_from_kernel is finally called. - */ - mutex_lock(mutex); - exc_port = excp->port; - if (!IP_VALID(exc_port)) { - mutex_unlock(mutex); - return(KERN_FAILURE); - } - ip_lock(exc_port); - if (!ip_active(exc_port)) { - ip_unlock(exc_port); - mutex_unlock(mutex); - return(KERN_FAILURE); - } - ip_reference(exc_port); - exc_port->ip_srights++; - ip_unlock(exc_port); - - flavor = excp->flavor; - behavior = excp->behavior; - mutex_unlock(mutex); - - switch (behavior) { - case EXCEPTION_STATE: { - mach_msg_type_number_t state_cnt; - thread_state_data_t state; - - c_thr_exc_raise_state++; - state_cnt = state_count[flavor]; - kr = thread_getstatus(a_self, flavor, - (thread_state_t)state, - &state_cnt); - if (kr == KERN_SUCCESS) { - kr = exception_raise_state(exc_port, exception, - code, codeCnt, - &flavor, - state, state_cnt, - state, &state_cnt); - if (kr == MACH_MSG_SUCCESS) - kr = thread_setstatus(a_self, flavor, - (thread_state_t)state, - state_cnt); - } - - if (kr == KERN_SUCCESS || kr == MACH_RCV_PORT_DIED) - return(KERN_SUCCESS); - - return(KERN_FAILURE); - } - - case EXCEPTION_DEFAULT: - c_thr_exc_raise++; - kr = exception_raise(exc_port, - retrieve_act_self_fast(a_self), - retrieve_task_self_fast(a_self->task), - exception, - code, codeCnt); + if (kr == KERN_SUCCESS || kr == MACH_RCV_PORT_DIED) + return(KERN_SUCCESS); + return(KERN_FAILURE); +} - if (kr == KERN_SUCCESS || kr == MACH_RCV_PORT_DIED) - return(KERN_SUCCESS); - return(KERN_FAILURE); - case EXCEPTION_STATE_IDENTITY: { - mach_msg_type_number_t state_cnt; - thread_state_data_t state; +/* + * Raise an exception on a task. + * This should tell launchd to launch Crash Reporter for this task. + */ +kern_return_t task_exception_notify(exception_type_t exception, + mach_exception_data_type_t exccode, mach_exception_data_type_t excsubcode) +{ + mach_exception_data_type_t code[EXCEPTION_CODE_MAX]; + wait_interrupt_t wsave; - c_thr_exc_raise_state_id++; - state_cnt = state_count[flavor]; - kr = thread_getstatus(a_self, flavor, - (thread_state_t)state, - &state_cnt); - if (kr == KERN_SUCCESS) { - kr = exception_raise_state_identity(exc_port, - retrieve_act_self_fast(a_self), - retrieve_task_self_fast(a_self->task), - exception, - code, codeCnt, - &flavor, - state, state_cnt, - state, &state_cnt); - if (kr == MACH_MSG_SUCCESS) - kr = thread_setstatus(a_self, flavor, - (thread_state_t)state, - state_cnt); - } + code[0] = exccode; + code[1] = excsubcode; - if (kr == KERN_SUCCESS || kr == MACH_RCV_PORT_DIED) - return(KERN_SUCCESS); - return(KERN_FAILURE); - } - - default: - - return(KERN_FAILURE); - }/* switch */ - return(KERN_FAILURE); + wsave = thread_interrupt_level(THREAD_UNINT); + exception_triage(exception, code, EXCEPTION_CODE_MAX); + (void) thread_interrupt_level(wsave); + return (KERN_SUCCESS); } - - /* - * Handle interface for special perfomance monitoring + * Handle interface for special performance monitoring * This is a special case of the host exception handler */ - -kern_return_t sys_perf_notify(struct task *task, - exception_data_t code, - mach_msg_type_number_t codeCnt) +kern_return_t sys_perf_notify(thread_t thread, int pid) { host_priv_t hostp; struct exception_action *excp; - thread_act_t act = current_act(); - thread_t thr = current_thread(); ipc_port_t xport; - kern_return_t ret; - int abrt; - spl_t ints; wait_interrupt_t wsave; + kern_return_t ret; - hostp = host_priv_self(); /* Get the host privileged ports */ - excp = &hostp->exc_actions[EXC_RPC_ALERT]; /* Point to the RPC_ALERT action */ + hostp = host_priv_self(); /* Get the host privileged ports */ + mach_exception_data_type_t code[EXCEPTION_CODE_MAX]; + code[0] = 0xFF000001; /* Set terminate code */ + code[1] = pid; /* Pass out the pid */ - mutex_lock(&hostp->lock); /* Lock the priv port */ - xport = excp->port; /* Get the port for this exception */ - if (!IP_VALID(xport)) { /* Is it valid? */ - mutex_unlock(&hostp->lock); /* Unlock */ - return(KERN_FAILURE); /* Go away... */ - } + struct task *task = thread->task; + excp = &hostp->exc_actions[EXC_RPC_ALERT]; + xport = excp->port; - ip_lock(xport); /* Lock the exception port */ - if (!ip_active(xport)) { /* and is it active? */ - ip_unlock(xport); /* Nope, fail */ - mutex_unlock(&hostp->lock); /* Unlock */ - return(KERN_FAILURE); /* Go away... */ - } + /* Make sure we're not catching our own exception */ + if (!IP_VALID(xport) || + !ip_active(xport) || + task->itk_space == xport->data.receiver) { - if (task->itk_space == xport->data.receiver) { /* Are we trying to send to ourselves? */ - ip_unlock(xport); /* Yes, fail */ - mutex_unlock(&hostp->lock); /* Unlock */ - return(KERN_FAILURE); /* Go away... */ + return(KERN_FAILURE); } - - ip_reference(xport); /* Bump reference so it doesn't go away */ - xport->ip_srights++; /* Bump send rights */ - ip_unlock(xport); /* We can unlock it now */ - - mutex_unlock(&hostp->lock); /* All done with the lock */ - - wsave = thread_interrupt_level(THREAD_UNINT); /* Make sure we aren't aborted here */ - - ret = exception_raise(xport, /* Send the exception to the perf handler */ - retrieve_act_self_fast(act), /* Not always the dying guy */ - retrieve_task_self_fast(act->task), /* Not always the dying guy */ - EXC_RPC_ALERT, /* Unused exception type until now */ - code, codeCnt); - - (void)thread_interrupt_level(wsave); /* Restore interrupt level */ - - return(ret); /* Tell caller how it went */ + + wsave = thread_interrupt_level(THREAD_UNINT); + ret = exception_deliver( + thread, + EXC_RPC_ALERT, + code, + 2, + excp, + &hostp->lock); + (void)thread_interrupt_level(wsave); + + return(ret); }