[[RESEND & PING]PATCH V3 0/1] Add C-SKY support

Mark Wielaard mark@klomp.org
Thu Jul 11 13:36:00 GMT 2019


On Thu, 2019-07-11 at 11:11 +0800, Mao Han wrote:
> On Wed, Jul 10, 2019 at 11:33:23PM +0200, Mark Wielaard wrote:
> > On Mon, 2019-06-03 at 16:16 +0800, Mao Han wrote:
> > > test binary:
> > > https://github.com/c-sky/test-result/blob/master/elfutils/divzero
> > > https://github.com/c-sky/test-result/blob/master/elfutils/core
> > 
> > I was looking at these, but they seem to have a wrong e_machine
> > value
> > of EM_RCE, not EM_CSKY? Is that deliberate?
> > 
> 
> I used an no upstream toolchain to verify coredump backtrace, which
> use
> the EM_CSKY_OLD equals to 39. We have changed the EM number to 252 in
> our newly released toolchain with compatibility to EM_CSKY_OLD.
> See binutils/include/elf/common.h:
> /* C-SKY historically used 39, the same value as MCORE, from which
> the
>    architecture was derived.  */
> #define EM_CSKY_OLD             EM_MCORE

Aha. But that is unfortunate on 2 levels. First EM_MCORE isn't an
official e_machine name. The value 39 is associated with EM_RCE for the
Morotola RCE. I assume those are the same thing?

Second, it makes it hard to check the elfutils backend since you'll
have to comment out all EM_RCE usage, and change the EM_CSKY to the old
value.

Do you have any binaries/core files generated by an upstream toolchain
that uses the assigned ELF values? That would be really helpful running
some tests.

Thanks,

Mark



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