Re: [Qemu-devel] Add ARM920T to ARM emulation

[Paul Brook]

On Monday 01 June 2009, Avi Kivity wrote:
> Paul Brook wrote:
> > B is a direct branch that never changes mode. BX is an indirect branch
> > that mode switches based on the low address bit.
> > BL and BLX(register) are exactly the same as B/BX except they also set
> > LR. BLX(immediate) is a direct mode switching call.
> > loads into the PC either ignore(v4t) or mode switch (v5) on the low
> > address bit.
> > ALU writes to the PC always ignore the low bit in Thumb mode. In ARM mode
> > the low bit is either ignored(v6) or used to mode switch (v7).
> >
> > BX was introduced in v4t, BLX was introduced in v5.
>
> Does no sane instruction set exist?

Thumb mode definitely has several "entertaining" aspects, but ARM mode is 
generally fairly sane.

Paul