author | Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com> |
Mon, 15 Mar 2010 12:45:50 +0200 | |
branch | RCL_3 |
changeset 21 | e7d2d738d3c2 |
parent 0 | a41df078684a |
permissions | -rw-r--r-- |
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// Copyright (c) 2006-2009 Nokia Corporation and/or its subsidiary(-ies). |
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// All rights reserved. |
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// This component and the accompanying materials are made available |
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// under the terms of the License "Eclipse Public License v1.0" |
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// which accompanies this distribution, and is available |
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// at the URL "http://www.eclipse.org/legal/epl-v10.html". |
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// |
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// Initial Contributors: |
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// Nokia Corporation - initial contribution. |
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// |
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// Contributors: |
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// |
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// Description: |
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// Purpose: Kernel-side tracking of debug agent information associated |
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// with each process being debugged. |
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// |
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// |
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#include <e32def.h> |
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#include <e32def_private.h> |
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#include <e32cmn.h> |
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#include <e32cmn_private.h> |
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#include <kernel/kernel.h> |
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#include <kernel/kern_priv.h> |
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#include <nk_trace.h> |
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#include <arm.h> |
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#include "d_process_tracker.h" |
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#include "debug_logging.h" |
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#include "d_debug_agent.h" |
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#include "debug_utils.h" |
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#include "d_debug_agent.inl" |
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using namespace Debug; |
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// ctor |
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DDebugAgent::DDebugAgent(TUint64 aId) : |
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iId(aId), |
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iRequestGetEventStatus(NULL), |
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iClientThread(0), |
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iEventQueue(KNumberOfEventsToQueue, 0), |
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iHead(0), |
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iTail(0), |
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iEventQueueLock(NULL), |
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iFreeSlots(KNumberOfEventsToQueue), |
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iIgnoringTrace(EFalse), |
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iEventBalance(0) |
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{ |
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LOG_MSG2("DDebugAgent::DDebugAgent(), this=0x%x ", this); |
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// Initialize all the Event Actions to Ignore |
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for(TInt i=0; i<EEventsLast; i++) |
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{ |
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iEventActions[i] = EActionIgnore; |
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} |
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} |
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DDebugAgent* DDebugAgent::New(TUint64 aId) |
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{ |
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LOG_MSG("DDebugAgent::New()"); |
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DDebugAgent* agent = new DDebugAgent(aId); |
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if(agent == NULL) |
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{ |
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return (NULL); |
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} |
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if(KErrNone != agent->Construct()) |
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{ |
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delete agent; |
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return (NULL); |
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} |
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// Use a semaphore to serialise access |
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TInt err = Kern::SemaphoreCreate(agent->iEventQueueLock, _L("RM_DebugAgentQueueLock"), 1 /* Initial count */); |
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if (err != KErrNone) |
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return NULL; |
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return agent; |
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} |
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/** Standard contructor. |
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* Fills event queue with empty events |
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* @return : standard system error code |
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*/ |
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TInt DDebugAgent::Construct() |
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{ |
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// Empty the event queue |
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LOG_MSG("DDebugAgent::Construct()"); |
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TDriverEventInfo emptyEvent; |
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TInt err = KErrNone; |
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for (TInt i=0; i<KNumberOfEventsToQueue; i++) |
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{ |
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err = iEventQueue.Append(emptyEvent); |
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if (err != KErrNone) |
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{ |
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LOG_MSG("Error appending blank event entry"); |
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return err; |
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} |
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} |
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err = Kern::CreateClientDataRequest(iRequestGetEventStatus); |
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if(err != KErrNone) |
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{ |
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LOG_MSG("Error creating TClientDataRequest"); |
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return err; |
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} |
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LOG_MSG2("DDebugAgent::Construct() iRequestGetEventStatus=0x%08x", iRequestGetEventStatus); |
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return err; |
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} |
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// dtor |
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DDebugAgent::~DDebugAgent() |
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{ |
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iEventQueue.Reset(); |
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if (iEventQueueLock) |
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iEventQueueLock->Close(NULL); |
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if(iRequestGetEventStatus) |
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Kern::DestroyClientRequest(iRequestGetEventStatus); |
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} |
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// Associate an action with a particular kernel event |
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TInt DDebugAgent::SetEventAction(TEventType aEvent, TKernelEventAction aEventAction) |
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{ |
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// Valid Event? |
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if (aEvent >= EEventsLast) |
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{ |
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LOG_MSG2("DDebugAgent::EventAction: Bad Event number %d",aEvent); |
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return KErrArgument; |
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} |
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iEventActions[aEvent] = aEventAction; |
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return KErrNone; |
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} |
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/** Get the aEventAction associated with aEvent |
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* |
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* @return : aEventAction (always +ve), or KErrArgument. |
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*/ |
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TInt DDebugAgent::EventAction(TEventType aEvent) |
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{ |
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// Validate the Event id |
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if (aEvent >= EEventsLast) |
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{ |
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LOG_MSG2("DDebugAgent::EventAction: Bad Event number %d",aEvent); |
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return KErrArgument; |
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} |
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// Return the action associated with this event |
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return iEventActions[aEvent]; |
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} |
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/** Obtain the details of the latest kernel event (if it exists) and place the details in aEventInfo |
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* If there is no event in the queue for this process+agent combination, store the details |
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* so that it can be notified later when an event actually occurs. |
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* |
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* @param aAsyncGetValueRequest - TClientDataRequest object used for pinning user memory |
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* @param aClientThread - The ThreadId of the requesting user-side process. In this case the DSS. |
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*/ |
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void DDebugAgent::GetEvent(TClientDataRequest<TEventInfo>* aAsyncGetValueRequest, DThread* aClientThread) |
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{ |
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LockEventQueue(); |
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iRequestGetEventStatus->Reset(); |
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TInt err = iRequestGetEventStatus->SetStatus( aAsyncGetValueRequest->StatusPtr() ); |
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if (err != KErrNone) |
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{ |
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LOG_MSG2("Error :iRequestGetEventStatus->SetStatus ret %d", err); |
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return; |
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} |
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iRequestGetEventStatus->SetDestPtr( aAsyncGetValueRequest->DestPtr() ); |
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iEventBalance++; |
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LOG_MSG4("DDebugAgent::GetEvent: this=0x%08x, iRequestGetEventStatus=0x%08x, iEventBalance=%d", |
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this, iRequestGetEventStatus, iEventBalance ); |
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iClientThread = aClientThread; |
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187 |
|
0 | 188 |
if (BufferEmpty()) |
189 |
{ |
|
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190 |
LOG_MSG2("Event buffer empty, iEventBalance=%d", iEventBalance); |
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191 |
UnlockEventQueue(); |
0 | 192 |
return; |
193 |
} |
|
194 |
||
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195 |
LOG_MSG2("Event already available at queue pos=%d", iTail); |
0 | 196 |
|
197 |
// returning the event to the client |
|
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198 |
err = iEventQueue[iTail].WriteEventToClientThread(iRequestGetEventStatus,iClientThread); |
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199 |
if (err != KErrNone) |
0 | 200 |
{ |
201 |
LOG_MSG2("Error writing event info: %d", err); |
|
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202 |
UnlockEventQueue(); |
0 | 203 |
return; |
204 |
} |
|
205 |
||
206 |
// signal the DSS thread |
|
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207 |
Kern::QueueRequestComplete(iClientThread, iRequestGetEventStatus, KErrNone); |
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208 |
iEventBalance--; |
0 | 209 |
|
210 |
iEventQueue[iTail].Reset(); |
|
211 |
||
212 |
// move to the next slot |
|
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213 |
IncrementTailPosition(); |
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214 |
|
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|
215 |
UnlockEventQueue(); |
0 | 216 |
} |
217 |
||
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218 |
/** |
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219 |
* Stop waiting for an event to occur. This means events will be placed |
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220 |
* in the iEventQueue (by setting iEventBalance to 0) until GetEvent is called. |
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|
221 |
*/ |
0 | 222 |
TInt DDebugAgent::CancelGetEvent(void) |
223 |
{ |
|
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224 |
LOG_MSG2("DDebugAgent::CancelGetEvent. iEventBalance=%d. > QueueRequestComplete", iEventBalance); |
0 | 225 |
Kern::QueueRequestComplete(iClientThread, iRequestGetEventStatus, KErrCancel); |
21
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226 |
iEventBalance=0; |
0 | 227 |
iClientThread = 0; |
228 |
return KErrNone; |
|
229 |
} |
|
230 |
||
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|
231 |
/** Signal a kernel event to the user-side DSS when it occurs, or queue it for later |
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232 |
* if the user-side has not called GetEvent (see above). |
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233 |
* |
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234 |
* @param aEventInfo - the details of the event to queue. |
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|
235 |
*/ |
0 | 236 |
void DDebugAgent::NotifyEvent(const TDriverEventInfo& aEventInfo) |
237 |
{ |
|
238 |
||
239 |
if(aEventInfo.iEventType >= EEventsLast) |
|
240 |
{ |
|
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|
241 |
LOG_MSG3("DDebugAgent::NotifyEvent(),iEventType %d, this=0x%x. Ignoring since > EEventsLast", aEventInfo.iEventType, this); |
0 | 242 |
return; |
243 |
} |
|
244 |
||
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|
245 |
LockEventQueue(); |
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Revision: 201010
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|
246 |
|
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|
247 |
DThread* currentThread = &Kern::CurrentThread(); |
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|
248 |
|
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|
249 |
LOG_MSG5("DDebugAgent::NotifyEvent(), iEventType %d, this=0x%x currThrd=0x%08x, iEventBalance=%d", |
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|
250 |
aEventInfo.iEventType, this, currentThread, iEventBalance ); |
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|
251 |
TKernelEventAction action = iEventActions[aEventInfo.iEventType]; |
0 | 252 |
|
253 |
switch (action) |
|
254 |
{ |
|
255 |
case EActionSuspend: |
|
256 |
{ |
|
257 |
LOG_MSG("DDebugAgent::NotifyEvent() Suspend thread"); |
|
21
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|
258 |
|
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|
259 |
switch(aEventInfo.iEventType) |
0 | 260 |
{ |
261 |
case EEventsAddLibrary: |
|
262 |
case EEventsRemoveLibrary: |
|
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|
263 |
currentThread = DebugUtils::OpenThreadHandle(aEventInfo.iThreadId); |
0 | 264 |
if(currentThread) |
265 |
{ |
|
266 |
currentThread->Close(NULL); |
|
267 |
} |
|
268 |
break; |
|
269 |
default: |
|
270 |
break; |
|
271 |
} |
|
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|
272 |
TInt err = TheDProcessTracker.SuspendThread(currentThread, aEventInfo.FreezeOnSuspend()); |
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|
273 |
if((err != KErrNone) && (err != KErrAlreadyExists)) |
0 | 274 |
{ |
275 |
// Is there anything we can do in the future to deal with this error having happened? |
|
276 |
LOG_MSG2("DDebugAgent::NotifyEvent() Problem while suspending thread: %d", err); |
|
277 |
} |
|
278 |
||
279 |
// now drop through to the continue case, which typically notifies |
|
280 |
// the debug agent of the event |
|
281 |
} |
|
282 |
case EActionContinue: |
|
283 |
{ |
|
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|
284 |
// Queue this event |
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|
285 |
QueueEvent(aEventInfo); |
0 | 286 |
|
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|
287 |
// Tell the user about the oldest event in the queue |
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|
288 |
if ( iClientThread ) |
0 | 289 |
{ |
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|
290 |
if( iRequestGetEventStatus && (iEventBalance > 0) ) |
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|
291 |
{ |
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|
292 |
// Fill the event data |
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|
293 |
TInt err = iEventQueue[iTail].WriteEventToClientThread(iRequestGetEventStatus,iClientThread); |
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|
294 |
if (err != KErrNone) |
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|
295 |
{ |
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|
296 |
LOG_MSG2("Error writing event info: %d", err); |
e7d2d738d3c2
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|
297 |
} |
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|
298 |
|
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|
299 |
// signal the debugger thread |
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|
300 |
LOG_MSG4("> QueueRequestComplete iRequestGetEventStatus=0x%08x, iEventBalance=%d, iTail=%d", |
e7d2d738d3c2
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|
301 |
iRequestGetEventStatus->iStatus, iEventBalance, iTail ); |
e7d2d738d3c2
Revision: 201010
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|
302 |
Kern::QueueRequestComplete(iClientThread, iRequestGetEventStatus, KErrNone); |
e7d2d738d3c2
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|
303 |
|
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|
304 |
iEventBalance--; |
0 | 305 |
|
21
e7d2d738d3c2
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|
306 |
iEventQueue[iTail].Reset(); |
0 | 307 |
|
21
e7d2d738d3c2
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|
308 |
// move to the next slot |
e7d2d738d3c2
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|
309 |
IncrementTailPosition(); |
e7d2d738d3c2
Revision: 201010
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|
310 |
} |
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|
311 |
else |
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|
312 |
{ |
e7d2d738d3c2
Revision: 201010
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|
313 |
if( !iRequestGetEventStatus ) |
e7d2d738d3c2
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|
314 |
{ |
e7d2d738d3c2
Revision: 201010
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|
315 |
LOG_MSG("iRequestGetEventStatus is NULL so not signalling client" ); |
e7d2d738d3c2
Revision: 201010
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|
316 |
} |
e7d2d738d3c2
Revision: 201010
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changeset
|
317 |
else |
e7d2d738d3c2
Revision: 201010
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|
318 |
{ |
e7d2d738d3c2
Revision: 201010
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|
319 |
LOG_MSG2("Queued event. iEventBalance=%d (unbalanced event requests vs notifications)", |
e7d2d738d3c2
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|
320 |
iEventBalance ); |
e7d2d738d3c2
Revision: 201010
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|
321 |
} |
e7d2d738d3c2
Revision: 201010
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|
322 |
} |
e7d2d738d3c2
Revision: 201010
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|
323 |
} |
0 | 324 |
else |
21
e7d2d738d3c2
Revision: 201010
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|
325 |
{ |
e7d2d738d3c2
Revision: 201010
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|
326 |
LOG_MSG("DDebugAgent::NotifyEvent() : Not informing client since its thread is NULL"); |
e7d2d738d3c2
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|
327 |
} |
e7d2d738d3c2
Revision: 201010
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|
328 |
break; |
0 | 329 |
} |
330 |
case EActionIgnore: |
|
331 |
default: |
|
21
e7d2d738d3c2
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|
332 |
LOG_EVENT_MSG("DDebugAgent::NotifyEvent() fallen through to default case"); |
0 | 333 |
// Ignore everything we don't understand. |
21
e7d2d738d3c2
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|
334 |
|
0 | 335 |
} |
336 |
||
21
e7d2d738d3c2
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|
337 |
UnlockEventQueue(); |
e7d2d738d3c2
Revision: 201010
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changeset
|
338 |
|
0 | 339 |
} |
340 |
||
341 |
// Used to identify which Debug Agent this DDebugAgent is associated with. |
|
342 |
TUint64 DDebugAgent::Id(void) |
|
343 |
{ |
|
344 |
return iId; |
|
345 |
} |
|
346 |
||
21
e7d2d738d3c2
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|
347 |
/** |
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* Used to add an event to the event queue for this debug agent if event |
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* queue is not at critical level. If it is at critical and it is trace event, |
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* we start ignoring trace events and insert a lost trace event. |
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* If the buffer cannot store an event, only insert a buffer full event. |
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* @see EEventsBufferFull |
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* @see EEventsUserTracesLost |
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* @see TDriverEventInfo |
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* @see iEventQueue |
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*/ |
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void DDebugAgent::QueueEvent(const TDriverEventInfo& aEventInfo) |
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{ |
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// Have we caught the tail? |
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if(BufferFull()) |
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{ |
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LOG_MSG("DDebugAgent::QueueEvent : BufferFull. Not queueing"); |
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return; |
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} |
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365 |
|
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// Assert if we think there is space but the slot is not marked empty |
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__NK_ASSERT_DEBUG(iEventQueue[iHead].iEventType == EEventsUnknown); |
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368 |
|
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const TBool bufferAtCritical = BufferAtCriticalLevel(); |
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370 |
|
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if(!bufferAtCritical) |
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{ |
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//reset the iIgnoringTrace flag as we are not at |
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//critical level and can store event |
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iIgnoringTrace = EFalse; |
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376 |
|
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// Insert the event into the ring buffer at iHead |
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iEventQueue[iHead] = aEventInfo; |
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IncrementHeadPosition(); |
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} |
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else if(bufferAtCritical && BufferCanStoreEvent()) |
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{ |
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LOG_MSG("DDebugAgent::QueueEvent : BufferCritical"); |
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if(aEventInfo.iEventType == EEventsUserTrace) |
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{ |
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if(!iIgnoringTrace) |
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{ |
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//if this is the first time we are ignoring trace events, |
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//we need to issue a EEventsUserTracesLost event |
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iEventQueue[iHead].Reset(); |
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iEventQueue[iHead].iEventType = EEventsUserTracesLost; |
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IncrementHeadPosition(); |
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iIgnoringTrace = ETrue; |
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} |
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else |
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{ |
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//otherwise, ignore this event |
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LOG_MSG("DDebugAgent::QueueEvent : Ignore EEventsUserTrace event"); |
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} |
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} |
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else |
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{ |
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// Store the event since its not a trace event |
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iEventQueue[iHead] = aEventInfo; |
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IncrementHeadPosition(); |
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} |
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} |
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else |
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{ |
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//At critical level and cannot store new events, so |
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//only one space left. Store a EEventsBufferFull event |
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LOG_MSG("DDebugAgent::QueueEvent : Event Buffer Full, ignoring event"); |
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iEventQueue[iHead].Reset(); |
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iEventQueue[iHead].iEventType = EEventsBufferFull; |
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IncrementHeadPosition(); |
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} |
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} |
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||
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// End of file - d_debug_agent.cpp |