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[[!meta title="core-linux-eglibc Port Bootstrap"]]
`core-linux-eglibc` is the first architecture port of ProteanOS 1.0.
([[ProteanOS_0.x|/dev/releases/0]] had a `cortexa8-linux-eglibc` architecture,
but `core-linux-eglibc` is being built from scratch.)
This port is being bootstrapped from a Debian GNU/Linux system.
Operating systems are often bootstrapped with GCC by building a cross compiling
GCC with a sysroot then using that to build the system. This port is instead
being bootstrapped natively in two stages. This is possible because care is
taken to ensure that the resulting ELF binaries are compatible with the
ProteanOS ABI (including the value of the ELF INTERP field and the file system
hierarchy).
The first stage involves building base system and toolchain packages and
unpacking them into a bootstrap system directory.
The second stage involves changing the file system root (with **chroot**(8)) to
the bootstrap directory and building source packages.
Stage 1
=======
These instructions are tested on a Debian wheezy amd64 GNU/Linux system.
The following directory structure is assumed:
<work-root>/
+- bootstrap_core-linux-eglibc/
+- etc/
+- lib/
+- [...]
+- pkg/
+- binutils/
+- eglibc/
+- gcc-4.7/
+- [...]
+- zlib/
Preparation
-----------
Build and install [opkbuild 3.0.0-alpha4][opkbuild-3.0.0-alpha4] and
[opkhelper 3.0.0-beta2][opkhelper-3.0.0-beta2].
The build system needs to be made to look a little more like ProteanOS.
To install `/etc/proteanos_arch` and `/etc/proteanos_plat` files on the build
system for **opkbuild**(1), run opkbuild's `mksysconf` makefile with `ARCH` and
`PLAT` macros, e.g.:
# ./mksysconf ARCH=core-linux-eglibc PLAT=dev
The `gcc-4.7` package will look for a symbolic link to the ELF interpreter
(dynamic linker) at `/usr/lib/core-linux-eglibc/ld.so`.
# mkdir /lib/core-linux-eglibc /usr/lib/core-linux-eglibc
# ln -sf /lib64/ld-linux-x86-64.so.2 /lib/core-linux-eglibc/ld-linux-x86-64.so.2
# ln -sf /lib/core-linux-eglibc/ld-linux-x86-64.so.2 /usr/lib/core-linux-eglibc/ld.so
Make a directory for the bootstrap ProteanOS system.
$ mkdir bootstrap_core-linux-eglibc
ProteanOS's ELF interpreter is not installed in the location described in the
ELF INTERP field of binaries built with the build system's GCC. Make a symbolic
link in the bootstrap system directory to direct Linux to the correct location
when it executes the stage 1 binaries.
$ mkdir bootstrap_core-linux-eglibc/lib64
$ ln -sf /lib/core-linux-eglibc/ld-linux-x86-64.so.2 bootstrap_core-linux-eglibc/lib64/ld-linux-x86-64.so.2
For most packages, this can be made unnecessary using GNU ld's
`--dynamic-linker` option, e.g. by setting `LDFLAGS` to
`-Wl,--dynamic-linker=/lib/core-linux-eglibc/ld-linux-x86-64.so.2`. Doing this
when building GCC, however, makes executables like `gcc`, `cpp`, and `cc1`
declare superfluous ELF NEEDED dependencies on `libstdc++.so.6` and
`libgcc_s.so.1`.
[opkbuild-3.0.0-alpha4]: http://files.proteanos.com/pub/opkbuild/3.0.0-alpha4/
[opkhelper-3.0.0-beta2]: http://lists.proteanos.com/proteanos-dev/2013/05/msg00001.html
Building EGLIBC
---------------
Run the following commands in a copy of the `eglibc` source package to build
EGLIBC for the bootstrap system.
$ opkbuild -b -c
Building zlib
-------------
Run the following commands in a copy of the `zlib` source package to build zlib
for the bootstrap system.
$ opkbuild -b -c
Building, Installing, and Testing GNU Binutils
----------------------------------------------
Run the following commands in a copy of the `binutils` source package to build
GNU Binutils for the bootstrap system.
$ ./config clean
$ PKG_TARGETS='core-linux-eglibc' ./config
$ opkbuild -b -c
Run the following commands in the bootstrap system directory to unpack the
`binutils` packages and their dependencies:
$ tar -xzOf ../pkg/libc.6_2.17~r22751+sip1-1_core-linux-eglibc_all.opk data.tar.gz | tar -xz
$ tar -xzOf ../pkg/libz.1_1.2.7+sip1-1_core-linux-eglibc_all.opk data.tar.gz | tar -xz
$ tar -xzOf ../pkg/binutils-common_2.22-1_all_all.opk data.tar.gz | tar -xz
$ tar -xzOf ../pkg/binutils-core-linux-eglibc_2.22-1_core-linux-eglibc_all.opk data.tar.gz | tar -xz
Now test some Binutils programs.
# chroot . as --version
GNU assembler (GNU Binutils for ProteanOS) 2.22
Copyright 2011 Free Software Foundation, Inc.
This program is free software; you may redistribute it under the terms of
the GNU General Public License version 3 or later.
This program has absolutely no warranty.
This assembler was configured for a target of `x86_64-unknown-linux-gnu'.
# chroot . readelf -hl /usr/bin/readelf
[...]
# chroot . objdump -p /usr/bin/objdump
[...]
Building the Multiple Precision Libraries
-----------------------------------------
TODO.
Building, Installing, and Testing GCC
-------------------------------------
Run the following commands in a copy of the `gcc-4.7` source package to build
GCC for the bootstrap system.
$ ./config clean
$ PKG_TARGETS='core-linux-eglibc' ./config
$ opkbuild -b -c
Run the following commands in the bootstrap system directory to unpack the
`gcc-4.7` packages and their dependencies.
$ tar -xzOf ../pkg/libc.6-dev_2.17~r22751+sip1-1_core-linux-eglibc_all.opk data.tar.gz | tar -xz
$ tar -xzOf ../pkg/libgcc.1_4.7.3+sip1-1_core-linux-eglibc_all.opk data.tar.gz | tar -xz
$ tar -xzOf ../pkg/libgomp.1_4.7.3+sip1-1_core-linux-eglibc_all.opk data.tar.gz | tar -xz
$ tar -xzOf ../pkg/libitm.1_4.7.3+sip1-1_core-linux-eglibc_all.opk data.tar.gz | tar -xz
$ tar -xzOf ../pkg/libgmp.10_5.0.5-1_core-linux-eglibc_all.opk data.tar.gz | tar -xz
$ tar -xzOf ../pkg/libmpc.3_1.0.1-1_core-linux-eglibc_all.opk data.tar.gz | tar -xz
$ tar -xzOf ../pkg/libmpfr.4_3.1.1-1_core-linux-eglibc_all.opk data.tar.gz | tar -xz
$ tar -xzOf ../pkg/cpp-4.7-core-linux-eglibc_4.7.3+sip1-1_core-linux-eglibc_all.opk data.tar.gz | tar -xz
$ tar -xzOf ../pkg/gcc-4.7-common_4.7.3+sip1-1_all_all.opk data.tar.gz | tar -xz
$ tar -xzOf ../pkg/gcc-4.7-core-linux-eglibc_4.7.3+sip1-1_core-linux-eglibc_all.opk data.tar.gz | tar -xz
Now try compiling, linking, and running an example program (the `fitblk.c`
example from zlib).
$ tar -xzOf ../pkg/libz.1-dev_1.2.7+sip1-1_core-linux-eglibc_all.opk data.tar.gz | tar -xz
$ cp ../pkg/zlib/tmp/src/examples/fitblk.c .
# chroot . core-linux-eglibc-gcc-4.7 -lz -o /fitblk /fitblk.c
# chroot . /fitblk
fitblk abort: need one argument: size of output block
Building and Installing GNU Make
--------------------------------
Run the following commands in a copy of the `gmake` source package to build GNU
Make for the bootstrap system.
$ opkbuild -b -c
Run the following commands in the bootstrap system directory to unpack the
`gmake` package:
$ tar -xzOf ../pkg/gmake_3.82-1_core-linux-eglibc_all.opk data.tar.gz | tar -xz
TODO
----
To be built and installed are busybox, linux-libre (headers), gcc-defaults,
opkbuild, opkhelper-3.0, and opkhelper-data.
Stage 2
=======
TODO.
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