Date: Thu, 14 Apr 2016 15:42:13 +0200 From: Szabolcs Nagy <nsz@...t70.net> To: musl@...ts.openwall.com Subject: Re: [PATCH v2] add powerpc64 port * Bobby Bingham <koorogi@...rogi.info> [2016-04-14 03:01:38 -0500]: > On Thu, Apr 14, 2016 at 01:05:07AM +0200, Szabolcs Nagy wrote: > > * Bobby Bingham <koorogi@...rogi.info> [2016-04-04 00:26:11 -0500]: > > > +++ b/arch/powerpc64/bits/setjmp.h > > > @@ -0,0 +1 @@ > > > +typedef unsigned long long __jmp_buf; > > > > hm glibc seems to use long with 16byte alignment, > > is the size diff because of alignment? > > Yes. Though apparently the glibc setjmp asm has code to detect a > misaligned jmp_buf, but its handling of that case ends up overflowing > the jmp_buf. > > I can make some changes to get our jmp_buf down to 65, but the only ways > to get it down to 64 are either with 16 byte alignment, or to have setjmp > spill vector registers to the stack first so it can copy them from there > to the jmp_buf through a gpr. > > How important is it to match glibc here? > i think we don't care about abi compat (but it might be interesting to check how much abi difference there is between glibc and musl, i can do this if i can build a musl+glibc toolchain) i just wanted to make sure we understand the cause of the difference.
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