[Vm-dev] ARM Simulator whitewash...

[Eliot Miranda]

Hi Tim,

   thanks!  So send me the code and I'll integrate. Would you allow me to
add you to the Cog collaborators page?  If so, for that I would like a URL
to a bio, online presence, or the like.

On Sat, Oct 3, 2015 at 9:01 AM, Tim Olson <tim.olson.mail at gmail.com> wrote:

>
>
> On 23-09-2015, at 11:18 AM, Eliot Miranda <eliot.miranda at gmail.com <http://lists.squeakfoundation.org/mailman/listinfo/vm-dev>> wrote:
> >* Is anyone interested in fixing the ARM simulator so that it does correctly simulate vfp instructions?  If so, let me know and I can help you set up the relevant environment.
> *
> The good news is that the disassembler code in the latest gdb tree at least appears to try to handle the VFP instructions, so that part might be already done for us. So far as I can make out the new version of armsupp.c has the VFP instructions added as of about july; if that all works it shouldn’t be too terrible a job.
>
> Of course, life is a touch complicated by the ugly hacks we had to create to make it work for us.
>
> I noticed the same in gdb-7.10, and have ported that to Cog, including all
> of Tim Rowledge's edits to get it working for Cog.  There were a few
> problems with getting it working in my build environment (64-bit Ubuntu
> 14.04 system), but I now can at least build the GdbARMPlugin and drop it
> into an existing cogspurlinuxht VM and run the ARMv5 emulation.
>
> The “sim: MULTIPLY64 - INVALID ARGUMENTS” messages are now gone, because
> the new simulator correctly simulates the smull instructions, but there
> still is a problem (illegal read from 0x4) due to trying to execute an
> instruction of all zero bits.  I’ve got a trace of the ARM code executed up
> to that point, if anyone is interested in debugging the ARM code further.
>
> — Tim Olson
>
>
>


-- 
_,,,^..^,,,_
best, Eliot
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