[Bug 1719] ARM assembly bx without thumb

bugzilla-daemon at rtems.org bugzilla-daemon at rtems.org
Tue Nov 23 15:06:43 UTC 2010


--- Comment #6 from Gedare <giddyup44 at yahoo.com> 2010-11-23 09:06:41 CST ---
(In reply to comment #5)
> The patch looks good now, but why do we need it?  Please have a look at "ARM
> Architecture Reference Manual" section A2.5.8, "The T and J bits" and A4.1.10,
> "BX".  Do you really have a processor that supports only ARMv4 (not ARMv4T) or
> even below that?

In my spare time I have been working on a BSP for an outdated but possibly
useful simulator (SimpleScalar: http://www.simplescalar.com/v4test.html) which
relies on the ARM ISA without thumb, so armv4 is the proper CPU model for it. 
If there is no interest in having support for pure ARM ports in the CVS then
that is fine, I can keep my effort local.

FWIW: I have managed to get up through bsp_start, but get a hang somewhere
during bsp_interrupt_initialize.  Since this is a part-time effort, I don't
know that I will resolve the issue.

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