Re: [RFC] [PATCH 1/7] User Space Breakpoint Assistance Layer (UBP)

From: Masami Hiramatsu
Date: Mon Jan 18 2010 - 10:59:17 EST

Jim Keniston wrote:
> Not really. For #3 (boosting), you need to know everything for #2,
> plus be able to compute the length of each instruction -- which we can
> now do for x86. To emulate an instruction (#4), you need to replicate
> what it does, side-effects and all. The x86 instruction set seems to
> be adding new floating-point instructions all the time, and I bet even
> Masami doesn't know what they all do, but so far, they all seem to
> adhere to the instruction-length rules encoded in Masami's instruction
> decoder.

Actually, current x86 decoder doesn't support FP(x87) instructions.(even
it already supported AVX) But I think it's not so hard to add it.

Thank you,

Masami Hiramatsu

Software Engineer
Hitachi Computer Products (America), Inc.
Software Solutions Division

e-mail: mhiramat@xxxxxxxxxx

To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at
Please read the FAQ at