[rtems commit] smpcapture02: Add test of functionality to add custom entries to capture trace
sebastian.huber at embedded-brains.de
Fri Feb 13 08:06:47 UTC 2015
On 13/02/15 08:56, Daniel Cederman wrote:
> > Daniel(s), could enlighten me why this is needed ? Is this a arch
> > constraint or something else ?
> > Chris
> It is an arch constraint. On SPARC, for example, all memory accesses
> needs to a be aligned. From the SPARC V8 manual:
> "Halfword accesses must be aligned on 2-byte boundaries, word accesses
> must be aligned on 4-byte boundaries, and doubleword accesses must be
> aligned on 8-byte boundaries. An improperly aligned address in a load
> or store instruction causes a trap to occur."
> Since the capture engine does a 64-bit write when it writes the time,
> the entries needs to be aligned on 8-byte boundaries.
If you need this hack in the test, then there is a bug in the caputure
Sebastian Huber, embedded brains GmbH
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