Date: Sun, 28 May 2017 11:24:53 +1200 From: Michael Clark <michaeljclark@....com> To: musl@...ts.openwall.com Cc: Alan Pillay <alanppillay4@...il.com>, lowrisc-dev@...ts.lowrisc.org Subject: Re: Re: [lowrisc-dev] Weekly Report of Porting musl to RISC-V Project #5 BTW RISC-V Linux is now under patch review for upstreaming into Linux kernel as it is a dependency for upstreaming glibc, so the ABI is essentially frozen: - https://lkml.org/lkml/2017/5/22/1058 <https://lkml.org/lkml/2017/5/22/1058> > On 28 May 2017, at 11:19 AM, Michael Clark <michaeljclark@....com> wrote: > > Hi, > > I’ve restarted the musl port for RISC-V based on this tree (which appeared to be the most recent): > > - https://github.com/lluixhi/musl-riscv <https://github.com/lluixhi/musl-riscv> > > I have a pull request against that tree that has some fixes and merges upstream, but is still parented against lluixhi > > - https://github.com/lluixhi/musl-riscv/pull/3 <https://github.com/lluixhi/musl-riscv/pull/3> > > I also have a branch with the same changes rebased against musl upstream git. > > - https://github.com/rv8-io/musl-riscv/tree/musl-upstream <https://github.com/rv8-io/musl-riscv/tree/musl-upstream> > > I obviously can’t make a pull request with a rebased tree so I have two branches, one parented to musl-riscv and the other parented to musl upstream. > > When I started, the tree did not compile due to a change in definition of long double to float128. I got the tree to compile by bringing in the QP changes but busybox linked against the resulting lib would fail with permission denied errors. I found that the stat.h was not the asm-generic version. RISC-V does not have it’s own syscall table and just uses the version in asm-generic, likewise for the stat structure. It seems the tree might have imported stat.h from another arch or been based on an earlier riscv-linux. I’ve brought in the generic versions from aarch64. The tree can now build a working busybox on a relatively recent riscv-linux tree i.e. Jan-2017, and it should work on latest riscv-linux as I don’t believe there have been any recent ABI breaks. > > So the port now passes the "busybox will run” test. Next on the list is to review the atomics. I have a commit I am preparing that defines a_cas similarly to aarch64 with load reserved store conditional. I’d also like to learn how to use the libc test suite. > > BTW Some of the RISC-V developers have asked why musl doesn’t use GCC atomic builtins? e.g. > > - https://gcc.gnu.org/onlinedocs/gcc/_005f_005fatomic-Builtins.html <https://gcc.gnu.org/onlinedocs/gcc/_005f_005fatomic-Builtins.html> > > Regards, > Michael > >> On 9 Dec 2016, at 1:36 PM, Alan Pillay <alanppillay4@...il.com <mailto:alanppillay4@...il.com>> wrote: >> >> What is the current status of musl on RISC-V? >> This was the last time I heard about it, but it has been many months since. >> Regards. >> >>> Hello, >>> >>> Thanks to the folks, I passed the mid-term evaluation. Now it is about >>> time to publish the fifth progress report on porting musl on RISC-V. >>> >>> Last week, the toolchain itself has been built for RISC-V and running >>> on Spike, and libc-test  can be executed with it now. I posted the >>> result of tests on . The REPORT.txt file contains all error >>> messages of failed tests, both run-time ones and compile-time ones. >>> >>> Some failures are expected since musl on x86_64 also does the same >>> ones (e.g. errors in src/api/fcntl.c), but there are some unexpected >>> errors too. I guess that the "warning: <the name of a header> is >>> shorter than expected" warning indicates bugs in arch-dependent part >>> of I/O functions or system calls (or kernel?) and it causes syntax >>> errors in the same compilation unit. >>> >>> Moreover, some tests triggers a "signal 11" error (segmentation fault) >>> in libc. I added some logs to . They are bugs in the port, >>> obviously. I am working on them. >>> >>> The good news is, anyway, some results are *better than x86_64*, >>> especially in math functions :-) >>> (probably the cause is the difference in the floating-point precision, >>> though. it is usual in float tests...) >>> >>> It takes long, long time to get but finally I have a (seems-to-be) >>> working test suite for the port. I will continue to debug and fix the >>> port using the result. Stay tuned! >>> >>> >>> : http://nsz.repo.hu/git/?p=libc-test <http://nsz.repo.hu/git/?p=libc-test> >>> : https://gist.github.com/omasanori/ee828369aea844ac7fdfdc8362953299 <https://gist.github.com/omasanori/ee828369aea844ac7fdfdc8362953299> >>> >>> -- >>> Masanori Ogino >> > Content of type "text/html" skipped
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