Date: Sat, 24 Nov 2012 11:01:50 +0100 From: Szabolcs Nagy <nsz@...t70.net> To: musl@...ts.openwall.com Cc: Florian Fainelli <florian@...nwrt.org>, openwrt-devel@...ts.openwrt.org Subject: Re: Support for musl libc in OpenWrt * Isaac Dunham <idunham@...abit.com> [2012-11-23 22:15:33 -0800]: > On Fri, 23 Nov 2012 21:10:33 +0100 > Florian Fainelli <florian@...nwrt.org> wrote: > > 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)? > At present, musl/mips relies on certain instructions that the kernel ordinarily emulates when they aren't supported. > the fpu issue should not cause segfault, iirc it infinite loops at the fp instruction it's a dynamic linking related issue i've already ran cross compiled, dynlinked mips binaries on an openwrt router using musl based toolchain (although that was about a month ago) i would guess it's some build issue (wrong thing gets linked, or -fPIC fails,..) or something in the runtime environment is different from what musl expects maybe try to run the loader in 'ldd' mode: musl's libc.so is the loader itself and can be invoked as pathto/libc.so executable which runs the dynlinked executable (so the musl dynamic loader can be straced) or ln -s pathto/libc.so pathto/ldd pathto/ldd executable which prints the opened dso paths during loading and then quits  https://bitbucket.org/GregorR/musl-cross/downloads
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