[PATCH] libdebugger: Fix for ARMv7-M with -O0 optimization

Sebastian Huber sebastian.huber at embedded-brains.de
Tue Feb 26 06:29:28 UTC 2019

On 25/02/2019 22:46, Chris Johns wrote:
> Hi,
> The patch looks like it is masking something but I am not sure.
> What are the errors at -O0 the patch is attempting to resolve?
> Which BSP is showing the issue?
> What is the multilib ARM arch?

The ARMv7-M is affected by this.

> Are these errors seen at -O2 and if not why does -O0 cause them?

With -O2 the assembler doesn't see the offending machine instructions, 
they are optimized away. See the useless local variables in 

> The intention is for the ARM back end to work on more than the CortexA9 so I am
> concerned with making the whole of `target_exception` dependent on CP15.

I just removed the useless assignment to local variables in 
rtems_debugger_target_set_vectors() and expanded the scope of the 
ARM_CP15 block. There is no functional change.

Sebastian Huber, embedded brains GmbH

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