Date: Mon, 20 Apr 2020 10:27:58 +1000 From: Nicholas Piggin <npiggin@...il.com> To: Nicholas Piggin via Libc-alpha <libc-alpha@...rceware.org>, Szabolcs Nagy <nsz@...t70.net> Cc: Rich Felker <dalias@...c.org>, libc-dev@...ts.llvm.org, linuxppc-dev@...ts.ozlabs.org, musl@...ts.openwall.com Subject: Re: Powerpc Linux 'scv' system call ABI proposal take 2 Excerpts from Szabolcs Nagy's message of April 16, 2020 7:58 pm: > * Nicholas Piggin via Libc-alpha <libc-alpha@...rceware.org> [2020-04-16 10:16:54 +1000]: >> Well it would have to test HWCAP and patch in or branch to two >> completely different sequences including register save/restores yes. >> You could have the same asm and matching clobbers to put the sequence >> inline and then you could patch the one sc/scv instruction I suppose. > > how would that 'patch' work? > > there are many reasons why you don't > want libc to write its .text I guess I don't know what I'm talking about when it comes to libraries. Shame if there is no good way to load-time patch libc. It's orthogonal to the scv selection though -- if you don't patch you have to conditional or indirect branch however you implement it. Thanks, Nick
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