Hi folks. The existing mechanisms for supporting pseudo instructions in the
fast model based CPUs won't work, and so a new mechanism is needed. Also,
because there are already a few different ways to call pseudo instructions,
it would be nice to consolidate or at least coordinate them, and to avoid
having to build magic, system specific addresses into the m5 utility
binary. Here is a design doc I wrote about that:

https://docs.google.com/document/d/1I7Jaj5_HssMSlvf-QKL1IsuBvV0Bm6a64At5vjhMIhU/edit?usp=sharing

This is focused on fast models, but also proposes a way to rework/expand
how pseudo instructions are called in general and the m5 utility so that
they're a little easier to use across the board.

Gabe
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