[twobob]

building qemu-arm statically from GIT

Clone the latest qemu from git http://git.qemu.org/qemu.git, then configure and make it

cd ~/GIT/qemu/arm-linux-user

git clone http://git.qemu.org/qemu.git

cd qemu

./configure --target-list="arm-linux-user" --disable-kvm --disable-strip --disable-xen --disable-spice --disable-werror --prefix=/usr/local --disable-bsd-user --static

make; make install

Check if we NEED to register the type with binfmt_misc...

dev binfmt_misc # cat /proc/sys/fs/binfmt_misc/qemu-arm

enabled
interpreter /usr/bin/qemu-arm-static
flags: OC
offset 0
magic 7f454c4601010100000000000000000002002800
mask ffffffffffffff00fffffffffffffffffeffffff

If this WASN'T populated... echo to register
(Only if the above is NOT already registered)

echo ":qemu-arm:M::\x7fELF\x01\x01\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x28\x00:\xff\xff\xff\xff\xff\xff\xff\x00\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff\xff:/usr/local/bin/qemu-arm:" > /proc/sys/fs/binfmt_misc/register

(note that this stipulates /usr/local/bin/qemu-arm make that w/e you want)

since I already HAVE the debian version on my system move that binary it out the way and use that binfmt_misc registration for ourselves...

mv /usr/bin/qemu-arm-static /usr/bin/qemu-arm-static-debian
cp /home/me/GIT/qemu/arm-linux-user/qemu-arm /usr/bin/qemu-arm-static

mount something we want to chroot into

sudo mount -t ext /home/me/IMAGES-FOR-DEBIAN/jessie.ext3 /mnt/jessie/

check what we built is kosher.

me@dev ~/GIT/qemu/arm-linux-user $ readelf -d ./qemu-arm

There is no dynamic section in this file.

me@dev ~/GIT/qemu/arm-linux-user $ ./qemu-arm -version

qemu-arm version 1.6.50, Copyright (c) 2003-2008 Fabrice Bellard

(as opposed to 1.0.50 in the repos)

me@dev ~/GIT/qemu/arm-linux-user $ ./qemu-arm --help

Spoiler:

usage: qemu-arm [options] program [arguments...]
Linux CPU emulator (compiled for arm emulation)

Options and associated environment variables:

Argument Env-variable Description
-h print this help
-g port QEMU_GDB wait gdb connection to 'port'
-L path QEMU_LD_PREFIX set the elf interpreter prefix to 'path'
-s size QEMU_STACK_SIZE set the stack size to 'size' bytes
-cpu model QEMU_CPU select CPU (-cpu help for list)
-E var=value QEMU_SET_ENV sets targets environment variable (see below)
-U var QEMU_UNSET_ENV unsets targets environment variable (see below)
-0 argv0 QEMU_ARGV0 forces target process argv[0] to be 'argv0'
-r uname QEMU_UNAME set qemu uname release string to 'uname'
-B address QEMU_GUEST_BASE set guest_base address to 'address'
-R size QEMU_RESERVED_VA reserve 'size' bytes for guest virtual address space
-d item[,...] QEMU_LOG enable logging of specified items (use '-d help' for a list of items)
-D logfile QEMU_LOG_FILENAME write logs to 'logfile' (default stderr)
-p pagesize QEMU_PAGESIZE set the host page size to 'pagesize'
-singlestep QEMU_SINGLESTEP run in singlestep mode
-strace QEMU_STRACE log system calls
-version QEMU_VERSION display version information and exit

Defaults:
QEMU_LD_PREFIX = /usr/gnemul/qemu-arm
QEMU_STACK_SIZE = 8388608 byte

You can use -E and -U options or the QEMU_SET_ENV and
QEMU_UNSET_ENV environment variables to set and unset
environment variables for the target process.
It is possible to provide several variables by separating them
by commas in getsubopt(3) style. Additionally it is possible to
provide the -E and -U options multiple times.
The following lines are equivalent:
-E var1=val2 -E var2=val2 -U LD_PRELOAD -U LD_DEBUG
-E var1=val2,var2=val2 -U LD_PRELOAD,LD_DEBUG
QEMU_SET_ENV=var1=val2,var2=val2 QEMU_UNSET_ENV=LD_PRELOAD,LD_DEBUG
Note that if you provide several changes to a single variable
the last change will stay in effect.

copy it into our debian victim

cp /usr/bin/qemu-arm-static /home/me/IMAGES-FOR-DEBIAN/usr/bin/qemu-arm-static

chroot in

sudo chroot /mnt/debian /bin/bash

root@dev:/#cat /etc/debian_version
jessie/sid

For reference...
Debian build log
https://buildd.debian.org/status/fet...amp=1322591568
What those build warnings mean to end users.
https://lists.gnu.org/archive/html/q.../msg04789.html

seems to work okay.