Date: Sun, 25 Nov 2012 12:46:26 +0100 From: Florian Fainelli <florian@...nwrt.org> To: musl@...ts.openwall.com Cc: Isaac Dunham <idunham@...abit.com>, openwrt-devel@...ts.openwrt.org Subject: Re: Support for musl libc in OpenWrt Le samedi 24 novembre 2012 07:15:33, Isaac Dunham a écrit : > On Fri, 23 Nov 2012 21:10:33 +0100 > > Florian Fainelli <florian@...nwrt.org> wrote: > > Hi All, > > > > Support for musl libc in OpenWrt has been added in revision r34314, > > Glad to hear it! > > > Note that the following issues are known: > > > > - unable to complete libstdc++ build due to some missing declarations > > (WIP) > > Are you using the default "linux-gnu" libstdc++, or the "generic" target? > Only the latter is known to work at this point. It is the linux-gnu libstdc++, we do not support building the "generic" one yet, might be worth supporting it now. > > > - MIPS and MIPSel ports are not functionnal (details below) > > > > -- > > MIPS and MIPSel specific issues: > > > > using qemu's binary emulation (qemu-mips[el]) against a statically > > linked binary works, a dynamic binary makes my host qemu segv. Using > > qemu-system-mips[el], the binary segfaults while being executed by the > > kernel. So far I have not had the time to debug this further. > > There are likely other issues, but are you using a hardfloat-compatible > kernel (FPU emulation enabled)? No, we have patched the kernel do disable the hardware FPU emulation, which was actually the issue, because musl setjmp MIPS-specific code tried to access Cop1 registers. After patching setjmp not to access these it works flawlessly on MIPS (big-endian) but MIPS (little-endian) still segfaults while being executed either from the kernel or qemu-mipsel. > At present, musl/mips relies on certain > instructions that the kernel ordinarily emulates when they aren't > supported. You mean ll/sc right? I build for MIPS32r2 so this should not be an issue. -- Florian
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