FW: FW: Trying to run on pid7t board

["Robert Cragie" <rcc at jennic dot com>]

Er, perhaps that wasn't quite right, as it would copy SPSR to CPSR
unconditionally. This version also should address copying user registers
back if pc is not in reglist. I am assuming that h-gr-usr contains the
values swapped out when the mode changed, but I'm not quite sure how they
are indexed. I realise there is no test for privileged op. yet - later. Am I
on the right track?

(define-pmacro (ldmia-psr-action bit-num)
  (sequence ()
	    (if (and reglist (sll 1 15))
	        (set (reg WI h-gr bit-num) (mem WI addr))
	        (set (reg WI h-gr-usr (sub bit-num 8)) (mem WI addr)))
	    (set addr (add addr 4)))
)

(define-pmacro (ldmia-psr-action-r15 ignored)
  (sequence ()
	    (set pc (mem WI addr))
	    (set addr (add addr 4))
	    (set (reg h-cpsr) (reg h-spsr)))
)

(dnai ldmia-psr "Load multiple registers (postindex, increment, update PSR)"
     ()
     "FIXME"
     (+ cond (f-op3 4) (f-preindex? 0) (f-up-down 1) (f-load-psr? 1)
	(f-write-back? 0) (f-load? 1) rn reglist)
     (sequence ((WI addr))
	       (set addr rn)
	       (multi-action  0 ldmia-action)
	       (multi-action  1 ldmia-action)
	       (multi-action  2 ldmia-action)
	       (multi-action  3 ldmia-action)
	       (multi-action  4 ldmia-action)
	       (multi-action  5 ldmia-action)
	       (multi-action  6 ldmia-action)
	       (multi-action  7 ldmia-action)
	       (multi-action  8 ldmia-psr-action)
	       (multi-action  9 ldmia-psr-action)
	       (multi-action 10 ldmia-psr-action)
	       (multi-action 11 ldmia-psr-action)
	       (multi-action 12 ldmia-psr-action)
	       (multi-action 13 ldmia-psr-action)
	       (multi-action 14 ldmia-psr-action)
	       (multi-action 15 ldmia-psr-action-r15))
)

Robert Cragie, Design Engineer
_______________________________________________________________
Jennic Ltd, Furnival Street, Sheffield, S1 4QT,  UK
http://www.jennic.com  Tel: +44 (0) 114 281 2655

-----Original Message-----
From: sid-owner@sources.redhat.com
[mailto:sid-owner@sources.redhat.com]On Behalf Of Robert Cragie
Sent: 23 August 2002 16:20
To: Ben Elliston
Cc: sid@sources.redhat.com
Subject: RE: FW: Trying to run on pid7t board


I can't find the directory you are referring to.

What I have done is this:

In sid/src/cgen/cpu/arm7.cpu, I have added the following instruction:

(dnai ldmia-psr "Load multiple registers (postindex, increment, update PSR)"
     ()
     "FIXME"
     (+ cond (f-op3 4) (f-preindex? 0) (f-up-down 1) (f-load-psr? 1)
	(f-write-back? 0) (f-load? 1) rn reglist)
     (sequence ((WI addr))
	       (set addr rn)
	       (multi-action  0 ldmia-action)
	       (multi-action  1 ldmia-action)
	       (multi-action  2 ldmia-action)
	       (multi-action  3 ldmia-action)
	       (multi-action  4 ldmia-action)
	       (multi-action  5 ldmia-action)
	       (multi-action  6 ldmia-action)
	       (multi-action  7 ldmia-action)
	       (multi-action  8 ldmia-action)
	       (multi-action  9 ldmia-action)
	       (multi-action 10 ldmia-action)
	       (multi-action 11 ldmia-action)
	       (multi-action 12 ldmia-action)
	       (multi-action 13 ldmia-action)
	       (multi-action 14 ldmia-action)
	       (multi-action 15 ldmia-action-r15)
	       (set (reg h-cpsr) (reg h-spsr)))
)

Will this work OK? I realise this is an incomplete implementation, and only
addresses the failed instruction, but one step at a time, as I am not at all
familiar with Scheme or CGEN.

So how do I rebuild sid to get this change in? I tried 'make all' in the
build directory originally created by src/configure and it didn't seem to do
anything.

Robert Cragie, Design Engineer
_______________________________________________________________
Jennic Ltd, Furnival Street, Sheffield, S1 4QT,  UK
http://www.jennic.com  Tel: +44 (0) 114 281 2655


> -----Original Message-----
> From: Ben Elliston [mailto:bje@redhat.com]
> Sent: 23 August 2002 13:52
> To: Robert Cragie
> Cc: sid@sources.redhat.com
> Subject: Re: FW: Trying to run on pid7t board
>
>
> >>>>> "Robert" == Robert Cragie <rcc@jennic.com> writes:
>
>   Robert> 0x8250: X_INVALID
>
>   Robert> ldmeqfd sp,{r0-r14,pc}^
>
>   Robert> I confess I know very little about this, but I notice in
>   Robert> CGEN, in arm7.cpu, only two ldmia's are supported (PUSWL =
>   Robert> 01001 and PUSWL = 01011). The opcode above (PUSWL: 01101)
>   Robert> (i.e. restore user mode banked registers) is not included,
>   Robert> so does this need to be in here too in some guise? Would
>   Robert> this be causing the invalid prefetch?
>
> Yes.  It should not take too much work to add that missing instruction
> variant and regenerate the cpu files from the CGEN description.  "make
> cgen-all" in the cgen-cpu/arm7t subdirectory ought to do it.
>
> Ben
>