On Wednesday 13 January 2010, Spencer Oliver wrote:
> - armv7m_run_algorithm now requires all algorithms to use
> a software breakpoint at their exit address
> - updated all algorithms to support this
I like! Except, again, for a few overlong lines. :)
But let's hold off for the 0.5 series for this; it's not a bugfix.
(I suspect that merge window will be open in a few weeks.) It's
a bit of a performance win for algorithm-heavy code, like flash
writing.
$SUBJECT is just a bit off though, needs fixing ... this this is
ARMv7-M only, not for all ARMv7 targets.
Covering the rest of ARMv7 would end up covering ARM9/ARM11 targets
too ... anything using the ARMv5 instruction set, or newer. (ARMv4
didn't include BKPT.) And while those targets really should get the
benefit of this approach, IMO that'd best be a separate patch.
- Dave
p.s. Random question ... have you looked at Cortex-M0 enough to have
a feeling for how many ARMv7-M algorithms should be reusable on
those new ARMv6-M chips? v6-M is basically a trimmed down v7-M.
Since it doesn't have many Thumb2 instructions, at least some of
the v7-M code won't run there. Looks to me like most of the rest
of the Cortex-M3 infrastructure will be fine with Cortex-M0.
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