On 8/21/07, Matthew James Horsnell <[EMAIL PROTECTED]> wrote:
>
> so ideally I want to be able to do something like this:
>
> format Jump {
> 0x15:
> if(Rb & 0xffff0000 == 0xffff0000) {
> syscall(Rb & 0x0000ffff);
> }
> else {
> jsr(IsCall);
> }
> }
>
>
Actually this won't work... the code you're changing is the decoder, which
simply maps static machine instruction patterns to the C++ StaticInst
objects that represent them. At the time this code is executed all you have
is the machine instruction and not the register values (and in fact this
mapping gets cached and will get reused any other time the same binary
machine instruction shows up).
You need to change the contents of the StaticInst subclass's execute()
method in order to change the runtime behavior of the instruction.
Steve
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