Date: Sat, 22 Apr 2000 10:24:50 +0100 (BST) From: Doug Rabson <dfr@nlsystems.com> To: Steve Price <sprice@hiwaay.net> Cc: freebsd-alpha@freebsd.org Subject: Re: porting Java to the alpha Message-ID: <Pine.BSF.4.21.0004221020560.62105-100000@salmon.nlsystems.com> In-Reply-To: <Pine.OSF.4.21.0004212244200.28130-100000@fly.HiWAAY.net>
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On Fri, 21 Apr 2000, Steve Price wrote:
> Hi all,
>
> I have a wild hair to spend some time (but no promises as
> to how much) porting JDK2 to the alpha. A couple of questions
> come to mind immediately after doing some work on the i386
> port.
>
> 1) What are the contents of sigjmp_buf._sjb[*]? Any pointers
> to some good Alpha assembly language docs would be great
> as I'd really like to understand the contents of
> src/lib/libc/alpha/gen/{,sig}setjmp.S.
> 2) Is there any state that I need to worry about maintaining
> when switching contexts that {,sig}setjmp and {,sig}longjmp
> don't already do for me? I know the Alpha doesn't have
> FP registers, but for instance on the i386 you have to
> (re)store the FPU mask when switching contexts. Anything like
> this on the Alpha that I should be aware of?
>
> TIA.
The jmp_buf formats should be the same as struct sigcontext. Note that
this *does* include FPU registers and FP control register but that for
efficiency, setjmp only saves registers which are preserved over function
calls.
--
Doug Rabson Mail: dfr@nlsystems.com
Nonlinear Systems Ltd. Phone: +44 181 442 9037
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