Re: [Sbcl-devel] sbcl for mipsle: "Illegal instruction"

[Peter M. <pm...@fr...>]

On Thu, Aug 25 2016, Christophe Rhodes wrote:

> then disassemble the code around that address

Thanks for your help with gdb. Here the result:

--8<---------------cut here---------------start------------->8---
   0x31b91708:  bnez    a3,0x31b928f4
   0x31b9170c:  nop
   0x31b91710:  lw      t0,48(s6)
   0x31b91714:  nop
=> 0x31b91718:  lwc1    $f0,-3(t0)
   0x31b9171c:  nop
   0x31b91720:  lw      t0,49(s8)
--8<---------------cut here---------------end--------------->8---


> On the other hand, I have no idea about the variety of MIPS instruction
> sets.  I would have expected that instructions would be added rather
> than removed as time went on (given that the MIPS build of sbcl worked a
> decade ago or so),

I expect that too. But MIPS III has been already introduced in 1992
(from https://en.wikipedia.org/wiki/MIPS_instruction_set).


> but that is probably a naïve expectation. I don't know about your
> platform; it may be that there are just one or two "missing"
> instructions, or it may be that things have changed fundamentally. But
> the first step is to find out what's causing the first fault, I think.

I guess, that the lwc1 and perhaps some other instructions have to be
replaced for my target?

-- 
           Peter