C.3. Hardware support for Context ID

The PTM outputs a variable-length Context ID value whenever trace is enabled, and as part of the periodic synchronization packet. This enables the debugger to determine the current Context ID value. You can also filter out unwanted trace based on the current Context ID using programmable trigger resources.

To support tracing when only a partial binary image is available, the PFT protocol maintains synchronization even when the PTM branches into unknown code regions. When the code jumps back into a region for which the code image is available the debugger can restart decompression immediately.

Copyright © 1999-2002, 2004-2008, 2011 ARM. All rights reserved.ARM IHI 0035B
Non-ConfidentialID060811