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Date: Wed, 5 Jun 2019 17:09:36 -0600
From: "tenspd137 ." <dcday137@...il.com>
To: musl@...ts.openwall.com
Subject: Re: Illegal instruction in __copy_tls()
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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