where to put defines for exception numbers as encoded in ARM CoreSight ETM traces

where to put defines for exception numbers as encoded in ARM CoreSight ETM traces

[Zied Guermazi]

hi

in ETM traces (3.4 and above), exception encodings for non v7m 
processors (v7A, is done in a 4 bit field, defined in table 7.12 - 
(https://developer.arm.com/documentation/ihi0014/q/ETMv3-Signal-Protocol/Instruction-tracing/Branch-Packets?lang=en#BABIECBB 
<https://developer.arm.com/documentation/ihi0014/q/ETMv3-Signal-Protocol/Instruction-tracing/Branch-Packets?lang=en#BABIECBB>). 
This is not the same encoding as for exception vector.

This is needed for handling the implementation of breakpoints as an 
undefined instruction trap in GDB for ARMv7 while decoding ETM traces 
(branch tracing extension to use ARM CoreSight ETM)

what will be a good location for adding defines for this exception 
encoding? will it be fine to add them in arch/arm.h? shall I create a 
new header file for them? please advise.

Kind Regards

Zied Guermazi

Re: where to put defines for exception numbers as encoded in ARM CoreSight ETM traces

[Simon Marchi]

> hi
> 
> in ETM traces (3.4 and above), exception encodings for non v7m processors (v7A, is done in a 4 bit field, defined in table 7.12 - (https://developer.arm.com/documentation/ihi0014/q/ETMv3-Signal-Protocol/Instruction-tracing/Branch-Packets?lang=en#BABIECBB <https://developer.arm.com/documentation/ihi0014/q/ETMv3-Signal-Protocol/Instruction-tracing/Branch-Packets?lang=en#BABIECBB>). This is not the same encoding as for exception vector.
> 
> This is needed for handling the implementation of breakpoints as an undefined instruction trap in GDB for ARMv7 while decoding ETM traces (branch tracing extension to use ARM CoreSight ETM)
> 
> what will be a good location for adding defines for this exception encoding? will it be fine to add them in arch/arm.h? shall I create a new header file for them? please advise.
> 
> Kind Regards
> 
> Zied Guermazi

Hi,

I don't know the specific details of this problem, but yes a file under
arch/ sounds fine.  These files contain definitions and helpers shared
between gdb and gdbserver (yes, even though it's under the gdb
directory).

Puting them in arm.h or in a new file are both fine.

Simon