Date: Wed, 11 May 2016 09:32:16 -0700 From: Gry Gunvor <gry.gunvor@...il.com> To: musl@...ts.openwall.com Subject: Re: porting musl to RISCV-64 On Wed, May 11, 2016 at 4:25 AM, Szabolcs Nagy <nsz@...t70.net> wrote: > newlib is for baremetal development, you don't > need to use threading with it It's attempt at reentrancy support is causing me problems. > musl now has 32bit mips, mips64 and mipsn32 support as well. > these are different abis so they have to be separate ports, > same is true for the riscv targets. Your documentation does not seem to mention the MIPS64 port, but now that I look in arch, I see the directory for it. > there is a google summer of code project to add riscv support > http://www.openwall.com/lists/musl/2016/04/27/3 > i think it is supposed to provide a working port within 1-2 > months (?) so if you can wait you don't need to do much work. Suppose I can't wait and I attempt this myself. Right now I'm just trying to get a generic libc working. I do not want to handle multi-threading or signals. What can I omit? Are the non-portabilities isolated in arch/ ? That is, is there much more to it than cloning the arch/mips64 directory and hacking on it? atomic_arch.h: I think I can make all of these functions empty as I am not going to be using multi-threading, right? crt_arch.h: program startup; what is this doing in a libc implementation? doesn't the compiler handle this? ksigaction.h: sorry, I'm not a hardware person; I suppose different hardware has a different default layout for a signal object? so this is not a thing determined by kernel software? I don't care to handle signals right now anyway. pthread_arch.h: again, I think I can make all of these functions empty as I am not going to be using multi-threading. reloc.h: I can't figure out what this is. syscall_arch.h: I've already written this for RISCV-64 (and so have the RISCV people). bits: to what extent is this MIPS64-specific? since there is *no* inline assembly, how come arch/generic/ doesn't do here? Gry
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