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Date: Thu, 6 Jun 2019 00:34:14 +0100
From: Michael Everitt <m.j.everitt@....org>
To: musl@...ts.openwall.com
Subject: Re: Illegal instruction in __copy_tls()
Musl doesn't support multilib ... :] fyi
On 06/06/19 00:32, tenspd137 . wrote:
> Quick question - anyone know how to make a crossdev crosscompiler
> multilib so I can use -m32 when I compile?
>
> Thanks!
>
> On Wed, Jun 5, 2019 at 5:09 PM tenspd137 . <dcday137@...il.com> wrote:
>> I probably don't fully understand how it works. In
>> /etc/x86_64-pc-linux-musl/etc.portage/make.conf, march is not
>> specified. It is specified in /etc/portage/make.conf. When I removed
>> it from there, things worked. Then I just put it back after using
>> crossdev to make x86_64-pc-linux-musl-*.
>>
>> Either way, loads of fun :)
>>
>> Thanks!
>>
>> -C
>>
>> On Wed, Jun 5, 2019 at 3:56 PM Michael Everitt <m.j.everitt@....org> wrote:
>>> In your /usr/${CTARGET}/etc/portage/make.conf you can set appropriate
>>> target flags there. But using 'march=native' is going to catch you out a
>>> lot cross-compiling anything ... :) At least if you've got it set to
>>> something, you're going to see errors that point immediately to your CFLAGS
>>> when/if it goes wrong!
>>>
>>> Michael.
>>>
>>> On 05/06/19 22:27, tenspd137 . wrote:
>>>> Thanks! That was indeed the problem. I had march=native for all
>>>> portage related stuff set, and my guess is that crossdev read that to
>>>> start. I removed that, reran the crossdev tool to buiild the cross
>>>> toolchain, and can now build static binaries that run on different
>>>> systems.
>>>>
>>>> Much appreciated!
>>>>
>>>> -C
>>>>
>>>> On Wed, Jun 5, 2019 at 2:07 PM Rich Felker <dalias@...c.org> wrote:
>>>>> On Wed, Jun 05, 2019 at 01:53:58PM -0600, tenspd137 . wrote:
>>>>>> Sure -
>>>>>>
>>>>>> strace -d -v ./a.out:
>>>>>> strace: ptrace_setoptions = 0x51
>>>>>> strace: new tcb for pid 26302, active tcbs:1
>>>>>> strace: [wait(0x80137f) = 26302] WIFSTOPPED,sig=SIGSTOP,EVENT_STOP (128)
>>>>>> strace: pid 26302 has TCB_STARTUP, initializing it
>>>>>> strace: [wait(0x80057f) = 26302] WIFSTOPPED,sig=SIGTRAP,EVENT_STOP (128)
>>>>>> strace: [wait(0x00127f) = 26302] WIFSTOPPED,sig=SIGCONT
>>>>>> strace: [wait(0x00857f) = 26302] WIFSTOPPED,sig=133
>>>>>> execve("./a.out", ["./a.out"], ["SSH_CONNECTION=15.86.136.27 5196"...,
>>>>>> "LANG=en_US.UTF-8", "XDG_SESSION_ID=41", "USER=dayd",
>>>>>> "PWD=/home/dayd/projects/musl-tes"..., "HOME=/home/dayd",
>>>>>> "SSH_CLIENT=xx.xxx.xxx.xx 51960 22", "CCACHE_DIR=/ssd/dayd/.ccache",
>>>>>> "VMWARE_USE_SHIPPED_GTK=yes", "XDG_DATA_DIRS=/usr/local/share:/"...,
>>>>>> "USECCACHE=ON", "SSH_TTY=/dev/pts/2", "MAIL=/var/mail/dayd",
>>>>>> "TERM=rxvt-unicode-256color", "SHELL=/bin/bash", "SHLVL=1",
>>>>>> "PYTHONPATH=:/home/dayd/projects/"..., "LOGNAME=dayd",
>>>>>> "DBUS_SESSION_BUS_ADDRESS=unix:pa"...,
>>>>>> "XDG_RUNTIME_DIR=/run/user/6686",
>>>>>> "PATH=/usr/lib/ccache/bin/:/usr/l"..., "USEDISTCC=OFF",
>>>>>> "_=/usr/bin/strace", "OLDPWD=/home/dayd/projects"]strace:
>>>>>> [wait(0x04057f) = 26302] WIFSTOPPED,sig=SIGTRAP,EVENT_EXEC (4)
>>>>>> strace: [wait(0x00857f) = 26302] WIFSTOPPED,sig=133
>>>>>> ) = 0
>>>>>> strace: [wait(0x00047f) = 26302] WIFSTOPPED,sig=SIGILL
>>>>>> --- SIGILL {si_signo=SIGILL, si_code=ILL_ILLOPN, si_addr=0x40169e} ---
>>>>>> strace: [wait(0x06057f) = 26302] WIFSTOPPED,sig=SIGTRAP,EVENT_EXIT (6)
>>>>>> strace: [wait(0x000084) = 26302] WIFSIGNALED,core,sig=SIGILL
>>>>>> +++ killed by SIGILL (core dumped) +++
>>>>>> strace: dropped tcb for pid 26302, 0 remain
>>>>>> Illegal instruction (core dumped)
>>>>>> ******************************************************************************************
>>>>>> (gdb) bt
>>>>>> #0 0x00000000004016ae in __copy_tls ()
>>>>>> #1 0x0000000000000000 in ?? ()
>>>>>> *****************************************************************************************
>>>>>>
>>>>>> (gdb) disassemble
>>>>>> Dump of assembler code for function __copy_tls:
>>>>>> 0x0000000000401680 <+0>: push %r13
>>>>>> 0x0000000000401682 <+2>: mov %rdi,%r13
>>>>>> 0x0000000000401685 <+5>: push %r12
>>>>>> 0x0000000000401687 <+7>: push %rbp
>>>>>> 0x0000000000401688 <+8>: push %rbx
>>>>>> 0x0000000000401689 <+9>: sub $0x8,%rsp
>>>>>> 0x000000000040168d <+13>: mov 0x410c(%rip),%rax #
>>>>>> 0x4057a0 <__libc+32>
>>>>>> 0x0000000000401694 <+20>: mov 0x410d(%rip),%rcx #
>>>>>> 0x4057a8 <__libc+40>
>>>>>> 0x000000000040169b <+27>: mov 0x40f6(%rip),%rbx #
>>>>>> 0x405798 <__libc+24>
>>>>>> 0x00000000004016a2 <+34>: lea -0xe0(%rdi,%rax,1),%rax
>>>>>> 0x00000000004016aa <+42>: lea -0x1(%rcx),%r12
>>>>>> => 0x00000000004016ae <+46>: andn %rax,%r12,%r12
>>>>> This instruction, andn, is not in the base x86_64 ISA. It's part of
>>>>> the BMI1 extension:
>>>>>
>>>>> https://en.wikipedia.org/wiki/Bit_Manipulation_Instruction_Sets#BMI1_(Bit_Manipulation_Instruction_Set_1)
>>>>>
>>>>> Apparently Gentoo is providing cross compilers that default to
>>>>> producing "native ISA level" code for the host, rather than baseline
>>>>> ISA for the target. But:
>>>>>
>>>>>> as a bonus (I thought this might also help):
>>>>>> (%:~/projects/musl-test)┌- x86_64-pc-linux-musl-gcc -v -static -O0 -g
>>>>>> hello.c
>>>>>> Using built-in specs.
>>>>>> COLLECT_GCC=x86_64-pc-linux-musl-gcc
>>>>>> COLLECT_LTO_WRAPPER=/usr/libexec/gcc/x86_64-pc-linux-musl/9.1.0/lto-wrapper
>>>>>> Target: x86_64-pc-linux-musl
>>>>>> Configured with:
>>>>>> /var/tmp/portage/cross-x86_64-pc-linux-musl/gcc-9.1.0/work/gcc-9.1.0/configure
>>>>>> --host=x86_64-pc-linux-gnu --target=x86_64-pc-linux-musl
>>>>>> --build=x86_64-pc-linux-gnu --prefix=/usr
>>>>>> --bindir=/usr/x86_64-pc-linux-gnu/x86_64-pc-linux-musl/gcc-bin/9.1.0
>>>>>> --includedir=/usr/lib/gcc/x86_64-pc-linux-musl/9.1.0/include
>>>>>> --datadir=/usr/share/gcc-data/x86_64-pc-linux-musl/9.1.0
>>>>>> --mandir=/usr/share/gcc-data/x86_64-pc-linux-musl/9.1.0/man
>>>>>> --infodir=/usr/share/gcc-data/x86_64-pc-linux-musl/9.1.0/info
>>>>>> --with-gxx-include-dir=/usr/lib/gcc/x86_64-pc-linux-musl/9.1.0/include/g++-v9
>>>>>> --with-python-dir=/share/gcc-data/x86_64-pc-linux-musl/9.1.0/python
>>>>>> --enable-languages=c,c++,fortran --enable-obsolete --enable-secureplt
>>>>>> --disable-werror --with-system-zlib --enable-nls
>>>>>> --without-included-gettext --enable-checking=release
>>>>>> --with-bugurl=https://bugs.gentoo.org/ --with-pkgversion='Gentoo 9.1.0
>>>>>> p1.0' --disable-esp --enable-libstdcxx-time
>>>>>> --enable-poison-system-directories
>>>>>> --with-sysroot=/usr/x86_64-pc-linux-musl --disable-bootstrap
>>>>>> --enable-__cxa_atexit --disable-multilib --with-multilib-list=m64
>>>>>> --disable-altivec --disable-fixed-point --enable-targets=all
>>>>>> --enable-libgomp --disable-libmudflap --disable-libssp
>>>>>> --disable-systemtap --disable-vtable-verify --disable-libvtv
>>>>>> --enable-lto --without-isl --disable-libsanitizer --enable-default-pie
>>>>>> --enable-default-ssp
>>>>>> Thread model: posix
>>>>>> gcc version 9.1.0 (Gentoo 9.1.0 p1.0)
>>>>>> COLLECT_GCC_OPTIONS='-v' '-static' '-O0' '-g' '-mtune=generic' '-march=x86-64'
>>>>>> /usr/libexec/gcc/x86_64-pc-linux-musl/9.1.0/cc1 -quiet -v hello.c
>>>>>> -quiet -dumpbase hello.c -mtune=generic -march=x86-64 -auxbase hello
>>>>>> -g -O0 -version -o /tmp/ccoTkh38.s
>>>>>> GNU C17 (Gentoo 9.1.0 p1.0) version 9.1.0 (x86_64-pc-linux-musl)
>>>>>> compiled by GNU C version 8.3.0, GMP version 6.1.2, MPFR version
>>>>>> 4.0.2, MPC version 1.1.0, isl version none
>>>>>> GGC heuristics: --param ggc-min-expand=100 --param ggc-min-heapsize=131072
>>>>>> ignoring nonexistent directory "/usr/x86_64-pc-linux-musl/usr/local/include"
>>>>>> ignoring nonexistent directory
>>>>>> "/usr/lib/gcc/x86_64-pc-linux-musl/9.1.0/../../../../x86_64-pc-linux-musl/include"
>>>>>> #include "..." search starts here:
>>>>>> #include <...> search starts here:
>>>>>> /usr/x86_64-pc-linux-musl/usr/include
>>>>>> /usr/lib/gcc/x86_64-pc-linux-musl/9.1.0/include
>>>>>> End of search list.
>>>>>> GNU C17 (Gentoo 9.1.0 p1.0) version 9.1.0 (x86_64-pc-linux-musl)
>>>>>> compiled by GNU C version 8.3.0, GMP version 6.1.2, MPFR version
>>>>>> 4.0.2, MPC version 1.1.0, isl version none
>>>>>> GGC heuristics: --param ggc-min-expand=100 --param ggc-min-heapsize=131072
>>>>>> Compiler executable checksum: a3183e5f435d1938198d432af6db159b
>>>>>> COLLECT_GCC_OPTIONS='-v' '-static' '-O0' '-g' '-mtune=generic' '-march=x86-64'
>>>>>> /usr/libexec/gcc/x86_64-pc-linux-musl/as -v --64 -o /tmp/ccHq7CL6.o
>>>>>> /tmp/ccoTkh38.s
>>>>>> GNU assembler version 2.32.0 (x86_64-pc-linux-musl) using BFD version
>>>>>> (Gentoo 2.32 p2) 2.32.0
>>>>>> COMPILER_PATH=/usr/libexec/gcc/x86_64-pc-linux-musl/9.1.0/:/usr/libexec/gcc/x86_64-pc-linux-musl/9.1.0/:/usr/libexec/gcc/x86_64-pc-linux-musl/:/usr/lib/gcc/x86_64-pc-linux-musl/9.1.0/:/usr/lib/gcc/x86_64-pc-linux-musl/
>>>>>> LIBRARY_PATH=/usr/lib/gcc/x86_64-pc-linux-musl/9.1.0/:/usr/lib/gcc/x86_64-pc-linux-musl/9.1.0/../../../../x86_64-pc-linux-musl/lib/:/usr/x86_64-pc-linux-musl/lib/:/usr/x86_64-pc-linux-musl/usr/lib/
>>>>>> COLLECT_GCC_OPTIONS='-v' '-static' '-O0' '-g' '-mtune=generic' '-march=x86-64'
>>>>>> /usr/libexec/gcc/x86_64-pc-linux-musl/9.1.0/collect2 -plugin
>>>>>> /usr/libexec/gcc/x86_64-pc-linux-musl/9.1.0/liblto_plugin.so
>>>>>> -plugin-opt=/usr/libexec/gcc/x86_64-pc-linux-musl/9.1.0/lto-wrapper
>>>>>> -plugin-opt=-fresolution=/tmp/ccWcifv4.res
>>>>>> -plugin-opt=-pass-through=-lgcc -plugin-opt=-pass-through=-lgcc_eh
>>>>>> -plugin-opt=-pass-through=-lc --sysroot=/usr/x86_64-pc-linux-musl -m
>>>>>> elf_x86_64 -static /usr/x86_64-pc-linux-musl/usr/lib/crt1.o
>>>>>> /usr/x86_64-pc-linux-musl/usr/lib/crti.o
>>>>>> /usr/lib/gcc/x86_64-pc-linux-musl/9.1.0/crtbeginT.o
>>>>>> -L/usr/lib/gcc/x86_64-pc-linux-musl/9.1.0
>>>>>> -L/usr/lib/gcc/x86_64-pc-linux-musl/9.1.0/../../../../x86_64-pc-linux-musl/lib
>>>>>> -L/usr/x86_64-pc-linux-musl/lib -L/usr/x86_64-pc-linux-musl/usr/lib
>>>>>> /tmp/ccHq7CL6.o --start-group -lgcc -lgcc_eh -lc --end-group
>>>>>> /usr/lib/gcc/x86_64-pc-linux-musl/9.1.0/crtend.o
>>>>>> /usr/x86_64-pc-linux-musl/usr/lib/crtn.o
>>>>>> COLLECT_GCC_OPTIONS='-v' '-static' '-O0' '-g' '-mtune=generic' '-march=x86-64'
>>>>>>
>>>>>> mtune=generic and march=x86-64 suggests it isn't trying to do
>>>>>> something weird on the compile computer.
>>>>> Indeed, it looks like the default is right. So you probably need to
>>>>> check how musl was built. Is it also a package provided by Gentoo, and
>>>>> did they perhaps use -march=native even though it's being cross
>>>>> compiled?
>>>>>
>>>>> Rich
>>>
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