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Date: Fri, 13 Jul 2012 11:15:56 -0400
From: Gregor Richards <gr@...due.edu>
To: musl@...ts.openwall.com
CC: Rich Felker <dalias@...ifal.cx>
Subject: Re: mips port working! & remaining issues

New cross compiler tarballs, particularly for those wishing for soft 
float, since that's not workable with the normal tarball:

Hard float: 
https://bitbucket.org/GregorR/musl-cross/downloads/crossx86-mips-linux-musl-2012-07-13-649cec5f.tar.xz

Soft float: 
https://bitbucket.org/GregorR/musl-cross/downloads/crossx86-mips-sf-linux-musl-2012-07-13-649cec5f.tar.xz

With valediction,
  - Gregor Richards

On 07/13/12 01:23, Rich Felker wrote:
> Hi all,
>
> According to libc-testsuite, the new mips port of musl is working. If
> remaining issues exist, I suspect they're in the bits/*.h files'
> definitions of kernel constants and structures, which I could use some
> help reviewing. Threads, including cancellation, are known to work,
> and mipsel (little endian) mode presumably works but is untested.
>
> One major omission that remains is the dynamic linker. Due to mips
> o32's pathologically bad PIC ABI which has no PC-relative addressing,
> the current dynamic linker cannot work as-is. Rather than replacing it
> with an ugly mess of fragile early-stage code that depends on
> non-optimization by the compiler (the way traditional dynamic linkers
> work), I'd rather simply require the dynamic linker and libc to be
> loaded at a fixed address chosen at build time -- this is basically
> what prelink does. We may be able to use the existing prelink tools,
> or just write a small special-purpose tool to prepare libc.so for
> loading at a fixed address.
>
> Another major omission shared with arm is that setjmp/longjmp cannot
> preserve floating point registers. This is because I don't yet know
> how to determine at runtime whether hard-float is available, and the
> registers can't be saved unless they can be determined to exist. Help
> solving this problem would also be appreciated.
>
> Rich


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