Date: Tue, 10 May 2016 23:05:01 -0700 From: Gry Gunvor <gry.gunvor@...il.com> To: musl@...ts.openwall.com Subject: porting musl to RISCV-64 I am interested in compiling for RISCV-64 (http://riscv.org/) using a libc that I compile myself so that I can run it through some source-to-source transformations before compiling it. The default RISCV tools will target their ports of either gnu libc or newlib. Gnu libc is huge, so I would rather avoid it; also I would rather use something released under a permissive open source license (BSD). Newlib is small, but I am not interested in multithreading and the multithreading/reentrancy support they have built into the library is causing me problems. So I thought I would try musl. I'm running on a vanilla Ubuntu 14.04 x86 machine and muscl builds out of the box. Using your gcc wrapper, hello world links and runs. I tried wrapping malloc at link time and that worked. Thus, so far, muscl is working great. FYI: You might want to know that this recent post on the subject of teaching C speaks of musl as "high-quality": http://blog.regehr.org/archives/1393 "We’ll want some lecture material about C’s place in the modern world and we also need to spend time reading some high-quality C code, perhaps starting with Redis, Musl, or Xv6. Musl, in particular, is a good match for teaching since it contains lots of cute little functions that can be understood in isolation." Anyway, suppose I want to port musl to RISCV-64 and cross-compile it. MIPS is a RISC architecture that is rather close to RISCV, but your MIPS support says 32-bit (and big-endian), so I take it you have some dependencies on what used to be called the "machine word size" (RISCV is 64-bit, but the RISCV docs still call a 32-bit unit a "word"; ugh; so now we need a new word for "word"). Thus I suspect that this is going to be non-trival. How much work is this going to be? Hints? More generally, any comments on what do you recommend as the easiest thing to do? Port musl to RISCV-64? Use a different libc? For those of you who know newlib, hack newlib to remove reentrancy goop? Gry
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