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Message-ID: <CAB=m8wKUzaNxuWHxtsiaT5i4rvAUyjagAq867e=ffihFM-2ryA@mail.gmail.com>
Date: Wed, 5 Jun 2019 15:27:07 -0600
From: "tenspd137 ." <dcday137@...il.com>
To: Rich Felker <dalias@...c.org>
Cc: musl@...ts.openwall.com
Subject: Re: Illegal instruction in __copy_tls()
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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