[Qemu-devel] r4k doesn't support movz

[Hervé Poussineau]

Hi,

Zhi-zhou Zhang a écrit :
> I found that when qemu-system-mips64el executed 'movz' with -M mips, 
> it would raise a reserved instruction exception.
> The mips spec describes movz as below:
>
> Mnemonic               Instructio                      Defined in MIPS ISA
> MOVZ            Move Conditional on Zero       MIPS32
>
> I think ISA-64 should support MIPS32 instructions for compatible. am I 
> right?

movz instruction is available on MIPS4 and MIPS32 instruction sets (+ 
Loongson2E/2F CPUs)
However, by default, 'mips' machine on qemu-system-mips64el uses a R4000 
CPU, which is only MIPS3 compatible.
You need to use another cpu which is MIPS4 or MIPS32 compatible with the 
-cpu option.

Regards,

Hervé