Date: Fri, 25 Aug 2017 17:26:13 -0700 From: John Baldwin <jhb@freebsd.org> To: freebsd-mips@freebsd.org Subject: Re: svn commit: r322915 - head/contrib/compiler-rt/lib/builtins Message-ID: <22196862.mDqZGdaYp0@ralph.baldwin.cx> In-Reply-To: <201708260017.v7Q0Hv9f054007@repo.freebsd.org> References: <201708260017.v7Q0Hv9f054007@repo.freebsd.org>
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On Saturday, August 26, 2017 12:17:57 AM John Baldwin wrote: > Author: jhb > Date: Sat Aug 26 00:17:57 2017 > New Revision: 322915 > URL: https://svnweb.freebsd.org/changeset/base/322915 > > Log: > Extend the workaround for LLVM bug 11663 to MIPS N32. > > This fixes infinite recursion in /sbin/init for MIPS N32. > > Submitted by: Robert M. Kovacsics <rmk35@cam.ac.uk> > MFC after: 1 week > Sponsored by: DARPA / AFRL With this fix (and some minor changes in the kernel to fix int-to-pointer-cast warnings) I was able to boot a MALTAN32 kernel with an n32 world (built with GCC 4.2.1) under qemu-system-mips64. I'm going to test external GCC next before seeing what kind of carnage clang wreaks. FYI, I've run into a few issues getting o32 built with clang to boot. I first tried to use in-tree ld.bfd which while it linked a full world, the /bin/sh binary was corrupted (in some places it had 'jal 0' rather than than a jump to a real symbol, in particular in __start() in crt1.c where it tries to call 'atexit(cleanup)'). Using external ld.bfd fixed that, but the resulting /bin/sh binary uses additional relocations (that N64 curiously doesn't), including R_MIPS_COPY. The /bin/sh binary also has a .pltrel which rtld doesn't currently grok, but I'm working on. -- John Baldwin
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