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Re: Question on PowerPC setjmp/longjmp ABI

To: Troy Benjegerdes <hozer at drgw dot net>
Subject: Re: Question on PowerPC setjmp/longjmp ABI
From: Richard Henderson <rth at twiddle dot net>
Date: Sat, 17 Feb 2001 17:24:54 -0800
Cc: Geoff Keating <geoffk at redhat dot com>, dmj+ at andrew dot cmu dot edu, libc-alpha at sourceware dot cygnus dot com
References: <20010217133410.A3549@drow.them.org> <200102172003.MAA22373@geoffk.org> <20010217145511.A25504@twiddle.net> <20010217190940.W12991@altus.drgw.net>

On Sat, Feb 17, 2001 at 07:09:41PM -0600, Troy Benjegerdes wrote:
> Please correct me if I'm wrong, but then what happens if a process is 
> using Altivec and gets a signal? Isn't there a potential for altivec 
> registers to get clobbered?

No, that's a kernel issue.

> Aside from that, the Altivec Programmers Interface Manual says that 
> altivec registers 20-31 are to be saved by setjmp/longjmp on the SVR4 ABI.

Then there _are_ ABI changes -- the ABI before Altivec is not
completely compatible with the one after.


r~

Follow-Ups:
- Re: Question on PowerPC setjmp/longjmp ABI
  - From: Geoff Keating

References:
- Question on PowerPC setjmp/longjmp ABI
  - From: Daniel Jacobowitz
- Re: Question on PowerPC setjmp/longjmp ABI
  - From: Geoff Keating
- Re: Question on PowerPC setjmp/longjmp ABI
  - From: Richard Henderson
- Re: Question on PowerPC setjmp/longjmp ABI
  - From: Troy Benjegerdes

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