Examining kernel objects and containers in Debugging information

Kernel objects such as DProcess, DThread, -DSemaphore, DChunk are all instances of classes -derived from DObject.

To show basic information about a DObject, use -the o -command.

To show more detail, use the -q command.

As an example, use these commands to show information about a -DProcess object whose address is shown using the -i command:

...
- TheCurrentDataSectionProcess=6403bb4c
- ...

> o 6403bb4c

This gives:

.o 6403bb4c
PROCESS at 6403bb4c VPTR=f8046c78 AccessCount=6 Owner=00000000
Full name crash

All objects derived from DBase have a virtual -table pointer, access count, owner and name. Using the -q command on this -address would you give you the full process information.

You can use o to examine other -types of objects, for example chunks. The thread information for the current -data section process shows two chunks:

NumChunks=2
0: Chunk 6403c044, run 00400000, access count 1
1: Chunk 64039688, run 00600000, access count 1

Using the o command on the first -of these chunk objects gives you the basic information:

.o 6403c044
CHUNK at 6403c044 VPTR=f8046b50 AccessCount=1 Owner=6403bb4c
Full name crash::$DAT

Using the q command gives you -more detailed information:

.q 6403c044
CHUNK at 6403c044 VPTR=f8046b50 AccessCount=1 Owner=6403bb4c
Full name crash::$DAT
Owning Process 6403bb4c
Size 2000, MaxSize 200000, Base 00400000
Attrib 6, StartPos 0
Type 6, State 2, Home Base 68900000
Home Region Offset 00000000
Home Region Base 68900000
Home Region Size 00100000
PTE: 0000055e, PDE: 00000021 00000001 00000001
NumPdes=1, iPdes=61000010, iHomePdes=61001a24
PdeBitMap=00000001, PageBitMap=6403c0c8
Domain -1

The information displayed is memory model dependent. It is -shown here for the moving memory model.

Notes:

-
Size 2000, MaxSize 200000, Base 00400000
-
The Size field shows the current size of the -chunk, in bytes.
-
The MaxSize field shows the maximum size of the -chunk, in bytes.
-
The Base field shows the base address in the run -region.
-
-
Attrib 6, StartPos 0
-
The Attrib field shows the attributes of the -chunk.
-
The StartPos field shows the offset, in bytes, -between the base address and the start of the committed area. This is non-zero -for double-ended chunks only.
-
-
Type 6, State 2, Home Base 68900000
-
The Type field shows the type of chunk. This -corresponds to a TChunkType enum value.
-
The State field shows the current state of the -chunk. This corresponds to a TChunkState enum value, which is -itself defined within the scope of the Symbian OS internal class -DMemModelChunk.
-
The Home Base field is the base address of the -chunk in the home region.
-
-
Home Region Offset 00000000
Home Region Base 68900000
Home Region Size 00100000
-
These three lines show the offset, base address and size (the -reserved size) of the chunk in the home region.
-

Kernel objects such as DProcess, DThread, +DSemaphore, DChunk are all instances of classes +derived from DObject.

To show basic information about a DObject, use +the o +command.

To show more detail, use the +q command.

As an example, use these commands to show information about a +DProcess object whose address is shown using the +i command:

...
+ TheCurrentDataSectionProcess=6403bb4c
+ ...

> o 6403bb4c

This gives:

.o 6403bb4c
PROCESS at 6403bb4c VPTR=f8046c78 AccessCount=6 Owner=00000000
Full name crash

All objects derived from DBase have a virtual +table pointer, access count, owner and name. Using the +q command on this +address would you give you the full process information.

You can use o to examine other +types of objects, for example chunks. The thread information for the current +data section process shows two chunks:

NumChunks=2
0: Chunk 6403c044, run 00400000, access count 1
1: Chunk 64039688, run 00600000, access count 1

Using the o command on the first +of these chunk objects gives you the basic information:

.o 6403c044
CHUNK at 6403c044 VPTR=f8046b50 AccessCount=1 Owner=6403bb4c
Full name crash::$DAT

Using the q command gives you +more detailed information:

The information displayed is memory model dependent. It is +shown here for the moving memory model.

Notes:

+
Size 2000, MaxSize 200000, Base 00400000
+
The Size field shows the current size of the +chunk, in bytes.
+
The MaxSize field shows the maximum size of the +chunk, in bytes.
+
The Base field shows the base address in the run +region.
+
+
Attrib 6, StartPos 0
+
The Attrib field shows the attributes of the +chunk.
+
The StartPos field shows the offset, in bytes, +between the base address and the start of the committed area. This is non-zero +for double-ended chunks only.
+
+
Type 6, State 2, Home Base 68900000
+
The Type field shows the type of chunk. This +corresponds to a TChunkType enum value.
+
The State field shows the current state of the +chunk. This corresponds to a TChunkState enum value, which is +itself defined within the scope of the Symbian OS internal class +DMemModelChunk.
+
The Home Base field is the base address of the +chunk in the home region.
+
+
Home Region Offset 00000000
Home Region Base 68900000
Home Region Size 00100000
+
These three lines show the offset, base address and size (the +reserved size) of the chunk in the home region.
+

Kernel Objects

Kernel Objects