Adding a MACHINE_ARCH note

[Adrian Chadd]

... boy I'd like to see this particular x86 hiccup fixed before this
stuff is mainstream.




adrian

On 9 July 2013 17:54, Peter Wemm <peter at wemm.org> wrote:
> On Tue, Jul 9, 2013 at 5:40 PM, Adrian Chadd <adrian at freebsd.org> wrote:
>> Someone pointed out there's dirty people running 32-bit binaries using
>> the 64-bit intel/amd instruction set.
>>
>> Is this also able to represent that?
>
> That would be "X32", so there's 3 x86 ABI variants:
> i386 - 32 bit
> amd64 - 32 bit
> amd64 - 64 bit
>
> Incidentally, pkgng has a issues with this.  For some reason it lumps
> both i386 and amd64 into a single pseudo-arch called "x86" with a 32
> and 64 bit variant.  It doesn't leave room for distinguishing the two
> incompatible 32 bit architectures.
>
> "x32" is where the compiler generates code where "long" and "pointer"
> are 32 bit, but the instruction set is otherwise amd64 and has all 16
> general purpose registers available.   "long long" is a 64 bit
> register instead of a pair of 32 bit registers like on i386.
>
>> -adrian
>>
>> On 9 July 2013 15:48, Andrew Turner <andrew at fubar.geek.nz> wrote:
>>> On Tue, 9 Jul 2013 08:19:46 -0600
>>> Warner Losh <imp at bsdimp.com> wrote:
>>>> I thought that the ELF headers gave us all the data we needed to know
>>>> how things were built...
>>>
>>> It will tell us if it was for e.g. an ARM or MIPS ELF file, but I'm not
>>> sure how we can tell the difference between an arm and an armv6 ELF.
>>>
>>> With armv6 there are a few changes in the userland/kernel
>>> interface, e.g. reading the thread local storage pointer is different
>>> such that an armv6 static binary would not run on an ARMv5 core as it
>>> uses newer instructions.
>>>
>>> Andrew
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>
>
>
> --
> Peter Wemm - peter at wemm.org; peter at FreeBSD.org; peter at yahoo-inc.com; KI6FJV
> UTF-8: So you can \342\200\231 .. for when a ' just won't do
> <brueffer> ZFS must be the bacon of file systems. "everything's better with ZFS"