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Date: Wed, 5 Jun 2019 22:56:19 +0100
From: Michael Everitt <m.j.everitt@....org>
To: musl@...ts.openwall.com
Subject: Re: Illegal instruction in __copy_tls()
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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