Where to find amd64 ABI information for FreeBSD?

[Kostik Belousov]

On Tue, Apr 05, 2011 at 03:10:37PM -0700, Xin LI wrote:
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> Hi,
> 
> Is there a place to find ABI information for GCC on FreeBSD?
>  Specifically, I'm looking for which registers has to be preserved
> across function call?  (Or do we follow System V Application Binary
> Interface AMD64 Architecture Processor Supplement Draft Version 0.99.5?)

The parts of the mentioned document that depend on compiler and
toolchain, are fully valid for FreeBSD. Our non-compliance is mostly
in the specified bits of the kernel/usermode interface.
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