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Debugging with RMHost
34 Copyright © 2000 ARM Limited. All rights reserved.. All rights reserved. ARM DUI 0137A
Note
This workaround is performed only if you have built RMTarget to support the
ExecuteCode packet (see
RM_OPT_EXECUTECODE
in the building chapter of the ARM
RMTarget Integration Guide).
It is recommended that you build RMTarget with support for either or both of the
following:
• word and/or halfword writes (see
RM_OPT_WRITEWORDS
and
RM_OPT_WRITEHALFWORD
in
the building chapter of the ARM RMTarget Integration Guide)
• the ExecuteCode packet (see
RM_OPT_EXECUTECODE
in the building chapter of the
ARM RMTarget Integration Guide).
3.1.3 CPU register access
CPU registers can be read while your application is stopped. It is not possible to
read/write CPU registers while your application is running.
Access to specific registers can be restricted using the register accessibility block built
into RMTarget (see the
RM_RegisterAccess
section of the API chapter in the ARM
RMTarget Integration Guide). If this is done, certain registers can become unreadable
or unwritable. If marked as unreadable, AXD does not return an error, but it displays
register values as zero.
Read and write access must not be removed from the program counter (pc) if start-stop
debugging (such as the ability to set breakpoints and stop the application) is to be
supported. Similarly, access to the unbanked registers must not be removed if
semihosting is to be supported.
3.1.4 Nonstop startup
When your application is running, and you establish connection to RMHost, your target
application is typically stopped. With RMHost, you can select a mode that allows your
application to continue to run when you establish connection to RMHost. If you connect
using this method, you can then check the state of your application without having to
stop it. You can do this using background memory accesses, which are supported by
RMHost (see Background memory access on page 33).
This feature is enabled when you select the option
ATTACH: Connect according to target
properties
. For more details, see the step on configuring the interface in Procedure for
connecting to RMHost using AXD on page 22.