Date: Tue, 07 Jul 2009 10:52:36 -0700 From: Peter Grehan <grehan@freebsd.org> To: Justin Hibbits <jrh29@alumni.cwru.edu> Cc: FreeBSD PowerPC ML <freebsd-ppc@freebsd.org> Subject: Re: FreeBSD/ppc ABI Message-ID: <4A538B64.2080506@freebsd.org> In-Reply-To: <fd9cd3450907071007l5501ea85y81bcb1ee8f4b8bdc@mail.gmail.com> References: <fd9cd3450907070641l45223e72p5f7147b97fc5755f@mail.gmail.com> <A07805D6-CAD5-4721-86AC-DE1751831D3C@semihalf.com> <fd9cd3450907071007l5501ea85y81bcb1ee8f4b8bdc@mail.gmail.com>
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Hi Justin, > The trick is only needed in user space, as a shim between two > functions, so I just need any volatile registers that I can use but > aren't function arguments. The target is G4/G5. I only need 3 or 4 > volatile registers, but the more the better. You'll probably have to use the stack to spill the param register. Have a look at the MCOUNT macro in ppc's <machine/profile.h> for an example of code that is an intercept between two routines and has to assume that all param registers are used (http://svn.freebsd.org/viewvc/base/head/sys/powerpc/include/profile.h?view=markup&pathrev=153813 is the version that has the code fragment commented). later, Peter.
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