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Date: Thu, 25 Jan 2018 02:04:12 +0000
From: Will Dietz <w@...z.org>
To: musl@...ts.openwall.com
Subject: Re: any one managed to compile and run xz-5.0.8 or xz-5.2.3 ?

Those seem to all be statically linked, do any dynamically linked programs
work?

This is particularly relevant since the crash occurs in early part of the
dynamic linker/loader.

On Wed, Jan 24, 2018, 7:38 PM Po-yi Wang <player@....bc.ca> wrote:

>
>
> On Wed, 24 Jan 2018, Rich Felker wrote:
>
> > On Wed, Jan 24, 2018 at 04:18:59PM -0800, Po-yi Wang wrote:
> >> hi
> >>
> >> any one managed to compile and run xz with musl on ppc target ?
> >> i've managed to compile and run "xz --version" on i486 and arm
> >> targets, but not on ppc target. i've tried gcc-3.4.5 and gcc-4.1.2.
> >> gcc-3.4.5 version simply hangs, while gcc-4.1.2 version seg faults --
> >> with seg fault, i can at least use gdb to get some info out. i do
> >> not know how to use gdb to trace a hanged program. anyway, this is
> >> the output for gcc-4.1.2 compiled version. (xz-5.0.8):
> >
> > Where did you get gcc 3.4.5 or 4.1.2 toolchains for musl ppc? Is any
> > other software working when compiled with them? If you're not using a
> > real cross or native musl toolchain but the musl-gcc wrapper, it
> > probably lacks a lot of stuff it needs to work on ppc. In particular a
> > ppc toolchain that will be used for dynamic-linking needs to be
> > configured to always use "secure-plt", and whether static or dynamic,
> > it needs to be using 64-bit long double. You should have hit an error
> > configuring musl here if the compiler doesn't match:
> >
> >    checking whether compiler's long double definition matches float.h...
> >
> > Please provide more details.
> >
> >> gdb src/xz/xz
> >>
> >> GNU gdb (GDB) 7.12.1
> >> Copyright (C) 2017 Free Software Foundation, Inc.
> >> License GPLv3+: GNU GPL version 3 or later
> >> <http://gnu.org/licenses/gpl.html>
> >> This is free software: you are free to change and redistribute it.
> >> There is NO WARRANTY, to the extent permitted by law.  Type "show
> copying"
> >> and "show warranty" for details.
> >> This GDB was configured as "powerpc-unknown-linux-gnu".
> >> Type "show configuration" for configuration details.
> >> For bug reporting instructions, please see:
> >> <http://www.gnu.org/software/gdb/bugs/>.
> >> Find the GDB manual and other documentation resources online at:
> >> <http://www.gnu.org/software/gdb/documentation/>.
> >> For help, type "help".
> >> Type "apropos word" to search for commands related to "word"...
> >> Reading symbols from src/xz/xz...done.
> >> (gdb) run --version
> >> Starting program: /tmp/build/xz-5.0.8/src/xz/xz --version
> >>
> >> Program received signal SIGSEGV, Segmentation fault.
> >> 0x4806fab8 in _dlstart_c (sp=0xbffff4a0, dynv=0x480b2ae4) at
> >> ldso/dlstart.c:146
> >> 146             GETFUNCSYM(&dls2, __dls2, base+dyn[DT_PLTGOT]);
> >> (gdb) bt
> >> #0  0x4806fab8 in _dlstart_c (sp=0xbffff4a0, dynv=0x480b2ae4)
> >>     at ldso/dlstart.c:146
> >> #1  0x480778ec in _dlstart () from /lib/ld-musl-powerpc-sf.so.1
> >> (gdb) quit
> >> A debugging session is active.
> >>
> >>         Inferior 1 [process 22188] will be killed.
> >>
> >> Quit anyway? (y or n) y
> >
> > This is an odd place to crash, and if it's crashing here it's almost
> > surely crashing for all programs, not just xz, since it hasn't gotten
> > to the point of looking at the program being run. It could be an issue
> > with very-outdated binutils doing something funny at link time linking
> > libc.so.
> actually other program compiled so far all works: (at least --version
> works)
> res/ppc/bash-4.4:         ELF 32-bit MSB executable, PowerPC or cisco
> 4500, version 1 (SYSV), statically linked, stripped
> res/ppc/dbclient:         ELF 32-bit MSB executable, PowerPC or cisco
> 4500, version 1 (SYSV), statically linked, stripped
> res/ppc/dropbear:         ELF 32-bit MSB executable, PowerPC or cisco
> 4500, version 1 (SYSV), statically linked, stripped
> res/ppc/dropbearconvert:  ELF 32-bit MSB executable, PowerPC or cisco
> 4500, version 1 (SYSV), statically linked, stripped
> res/ppc/dropbearkey:      ELF 32-bit MSB executable, PowerPC or cisco
> 4500, version 1 (SYSV), statically linked, stripped
> res/ppc/ftp-0.17:         ELF 32-bit MSB executable, PowerPC or cisco
> 4500, version 1 (SYSV), statically linked, stripped
> res/ppc/make-3.80:        ELF 32-bit MSB executable, PowerPC or cisco
> 4500, version 1 (SYSV), statically linked, stripped
> res/ppc/make-4.1:         ELF 32-bit MSB executable, PowerPC or cisco
> 4500, version 1 (SYSV), statically linked, stripped
> res/ppc/msgfmt:           ELF 32-bit MSB executable, PowerPC or cisco
> 4500, version 1 (SYSV), statically linked, stripped
> res/ppc/msgmerge:         ELF 32-bit MSB executable, PowerPC or cisco
> 4500, version 1 (SYSV), statically linked, stripped
> res/ppc/ntpserver:        ELF 32-bit MSB executable, PowerPC or cisco
> 4500, version 1 (SYSV), statically linked, stripped
> res/ppc/patch-2.7.5:      ELF 32-bit MSB executable, PowerPC or cisco
> 4500, version 1 (SYSV), statically linked, stripped
> res/ppc/scp:              ELF 32-bit MSB executable, PowerPC or cisco
> 4500, version 1 (SYSV), statically linked, stripped
> res/ppc/tar-1.22:         ELF 32-bit MSB executable, PowerPC or cisco
> 4500, version 1 (SYSV), statically linked, stripped
> res/ppc/xxd-5.7:          ELF 32-bit MSB executable, PowerPC or cisco
> 4500, version 1 (SYSV), statically linked, stripped
> res/ppc/xxxd:             ELF 32-bit MSB executable, PowerPC or cisco
> 4500, version 1 (SYSV), statically linked, stripped
>
>
> >
> > Rich
> >
>

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