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[Patch, mips]: Add support for FR=1/o32. Update implemention of setjmp/longjmp

From: Matheus Almeida <Matheus dot Almeida at imgtec dot com>
To: "libc-ports at sourceware dot org" <libc-ports at sourceware dot org>
Cc: Doug Gilmore <Doug dot Gilmore at imgtec dot com>
Date: Tue, 26 Nov 2013 11:13:59 +0000
Subject: [Patch, mips]: Add support for FR=1/o32. Update implemention of setjmp/longjmp
Authentication-results: sourceware.org; auth=none

Mips allow the width of FPU registers to be controlled by specifying the FR configuration bit:
FR=0 -> 32-bit FPU registers
FR=1 -> 64-bit FPU registers
This can be controlled by -mfp32/-mfp64 command line options.

This patch updates the definition of setjmp, longjmp and jmp_buf so that on a call to setjmp/longjmp, all the required floating-point callee-saved registers are properly saved/restored. 

We are aware that updating the size of jmp_buf can potentially break existing applications but we expect the number of applications built with FR=1 mode to be very small, possibly zero. Nevertheless this should be clearly stated in the release notes that existing applications built with FR=1 (-mfp64) need to be recompiled in order to use new versions of the library.

Regards,
Matheus

Matheus Almeida
MIPS processor IP
www.imgtec.com

Attachment: glibc_fp64.patch
Description: glibc_fp64.patch

Follow-Ups:
- Re: [Patch, mips]: Add support for FR=1/o32. Update implemention of setjmp/longjmp
  - From: Joseph S. Myers

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