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Re: [WIP/RFC] MIPS registers overhaul

At Sat, 14 Jun 2003 21:36:04 -0400, Andrew Cagney wrote:

Chris?


Sorry, I must have missed that msg... 8-)



That isn't quite the detail I was looking for. Does the code need to look like:

save::
	save FSR
	if (FSR & FR)

*** when FR == 1, it's 32 64-bit registers. so, invert.

save 32x32 FP 

   *** or, save 16 (even) 64-bit FP registers, if MIPS2 or later.
   *** in fact, on MIPS2 and later, better to do that, since it'll be
   *** more efficient (fewer instructions).

But see my other post. Using a double store gives different behavior to two single stores. I guess the kernel can do a double store, only then swapping the registers before supplying them to gdb.

Andrew


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