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The Linux kernels ELF-FDPIC binfmt program loader can support loading and
running conventional ELF format binaries on noMMU kernels when compiled
appropriately. That is when they are constant displacement binaries such
as generated using the -pie compile option.
Add a configure option to allow selecting ELF binary support in noMMU
mode configurations on architectures that support this. The main
requirement is to generate the ldso run-time loader to perform relocation
at load time. These configurations do not support shared libraries, so
there is no need to generate a full shared library, only the static
version is required.
The use of ELF format binaries does mean a slightly simpler toolchain
generation (does not require a -uclinux- for some architectures) and does
not require an extra tool like elf2flt.
This initial support targets M68K, ARM and RISC-V architectures. No kernel
changes are required, the required support for this is already in mainline
kernels (certainly as of linux-6.6).
Note that for the M68K and ARM architectures that the initialized
registers and stack layout at process startup is slightly different for
the flat format loader and the ELF/ELF-FDPIC loaders. So we need some
changes to the startup code (crt1.S) for them.
I have not done extensive testing outside of M68K, ARM and RISC-V.
I had to make changes to a couple of the dl-startup.h architecture files
to get them to build for this noMMU case. I did not dig down too deep on
the reasons, but they still seem ok for the MMU case as well.
Signed-off-by: Greg Ungerer <gerg@linux-m68k.org>
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Threads currently have 2-4 MiB stacks by default (depending on the
platform). This is fine on MMU platforms, where this stack space is not
actually allocated until it is used, but tends to waste a large amount
of memory on no-MMU platforms.
This patch adds a PTHREADS_STACK_DEFAULT_SIZE Kconfig option that allows
the user to override the default stack size at build time. This allows
the user to select a reasonable default stack size for the software that
runs on their system, and avoids the need to patch every package to add
calls to pthread_attr_setstacksize().
An alternative to this patch would be to change the hardcoded default
stack size on no-MMU platforms, but it is difficult to choose an
appropriate value because the minimum required stack depends on the
software in use. This would also be a breaking change.
Signed-off-by: Ben Wolsieffer <ben.wolsieffer@hefring.com>
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The only difference, with regard to libc, is the compile flag: -march=
Signed-off-by: Yann Sionneau <ysionneau@kalray.eu>
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Added 32-bit RISC-V support. I have managed to get 32-bit RISC-V No-MMU
Linux running based on mainstream buildroot. It's nice to have uclibc
support this 32-bit No-MMU target.
There's no substantial code change except definations and config
options.
Signed-off-by: Yimin Gu <ustcymgu@gmail.com>
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Modified config files and crt1.S to support static pie elf generation.
Signed-off-by: linted <linted@users.noreply.github.com>
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Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
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on mips
Updated config to allow compilation of rcrt1.o for mips and modified it's crt1.S to perform relocates in __start.
The mips architecture performs relocations differently then most other architectures. reloc_static_pie was rewritten, taking code from dl-startup.c, in order to perfrom the additional relocations. Modifications were made to mips' dl-startup.h to allow for the use of contained macros without including _start definition.
Signed-off-by: linted <linted@users.noreply.github.com>
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Patch suggested by Thomas Petazzoni and tested by me.
Reported-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
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on aarch64
Updated config to allow compilation of rcrt1.o for aarch64 and modified it's crt1.S to relocate dynamic section prior to __uClibc_main.
Disabled stack protector when compiling reloc_static_pie.c to avoid TLS access prior to it being setup.
Signed-off-by: linted <linted@users.noreply.github.com>
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on i386, x86_64, and arm.
This patch adds the generation of rcrt1.o which is used by gcc when compiling with the --static-pie flag.
rcrt1.o differs from crt1.o and Scrt1.o in that it the executable has a dynamic section but no relocations have been performed prior to _start being called.
crt1.o assumes there to be no dynamic relocations, and Scrt1.o has all relocations performed prior to execution by lsdo.
The new reloc_static_pie function handles parsing the dynamic section, and performing the relocations in a architecture agnostic method.
It also sets _dl_load_base which is used when initalizing TLS to ensure loading from the proper location.
This allows for easier porting of static-pie support to additional architectures as only modifications to crt1.S to find the load address are required.
Signed-off-by: linted <linted@users.noreply.github.com>
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Implement getcontext, makecontext, setcontext and swapcontext.
Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
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Dns lookup logic has been updated to provide a configurable compile
time selection of dns query id generation logics, including random,
where possible, instead of the previous simple counter mode.
This should make dns poison attempts more difficult. The uclibc
developers wish to thank the white hat teams which alerted the
community about the possible weakness in the dns path, given the
increased resources with adversaries today.
Given that embedded systems may or may not have sources for trying
to generate random numbers, and also to try and keep the load on
the system low, by default it uses the standard random prng based
logic to indirectly generate the ids.
However if either urandom or else if realtime clock is available on
the target, then the same is used to reseed the prng periodically
in a slightly non deterministic manner. Also additional transform
(one way where possible) is used to avoid directly exposing the
internal random sequence.
The dns lookup logic maintains its own state wrt the random prng
functions, so that other users of the library's random prng are
not affected wrt their operations with the prng.
Note to Platform developers:
If you want to change from the default prngplus based logic, to one
of the other logics provided, then during compile/config time you can
switch to one of these additional choices wrt dns query id generation,
by using make config and companions.
If your platform doesnt support urandom nor a realtime clock backed
by a source with sufficient resolution, and or for some reason if you
want to revert to previous simple counter, rather than the transformed
random prng plus logic, you can force the same at compile time by
selecting SimpleCounter mode.
If you want to increase the randomness of the generated ids, and dont
mind the increased system load and latency then you could select the
Urandom mode during config. Do note that it will be dipping into the
entropy pool maintained by ur system.
If your target has a system realtime clock available and exposed to
user space, and inturn if you want to keep the underlying logic simple,
you could try using the clock option from the config. However do note
that the clock should have nanosecond resolution to help generate ids
which are plausibly random. Also improvements to processor and or io
performance can affect this.
Wrt the URandom and Clock modes, if there is a failure with generation
of the next random value, the logic tries to fallback to simple counter
mode.
If you want to change the underlying logic to make it more random
and or more simple, look at dnsrand_setup and dnsrand_next.
Signed-off-by: hanishkvc <hanishkvc@gmail.com>
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This commit adds support for Kalray VLIW family (kvx)
Kalray kv3 core is embedded in Kalray Coolidge SoC. This core which is the
third of the KV family has the following features:
32/64 bits execution mode
6-issue VLIW architecture
64 x 64bits general purpose registers
SIMD instructions
little-endian
In order to build a usable toolchain, build scripts are provided at the
following address: https://github.com/kalray/build-scripts.
Kalray uses FOSS which is available at https://github.com/kalray
This includes Linux kernel, uClibc-ng, gcc, binutils, etc.
Signed-off-by: Clément Léger <cleger@kalray.eu>
Signed-off-by: Guillaume Thouvenin <gthouvenin@kalray.eu>
Signed-off-by: Laurent Thevenoux <lthevenoux@kalray.eu>
Signed-off-by: Marc Poulhies <mpoulhies@kalray.eu>
Signed-off-by: Marius Gligor <mgligor@kalray.eu>
Signed-off-by: Yann Sionneau <ysionneau@kalray.eu>
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Signed-off-by: akater <nuclearspace@gmail.com>
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Only MMU variant is supported.
Signed-off-by: Vladimir Murzin <vladimir.murzin@arm.com>
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Similar to glibc commit
https://sourceware.org/git/?p=glibc.git;a=commit;h=6bbfc5c09fc5b5e3d4a0cddbbd4e2e457767dae7
we need to handle Linux kernel change, which removed stat64 family from default syscall set.
Signed-off-by: Waldemar Brodkorb <wbx@openadk.org>
Signed-off-by: Waldemar Brodkorb <wbrodkorb@conet.de>
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basically from or1k port of uClibc-ng, with fixes for structures in
pthreadtypes.h from 64 bit architectures.
18 testsuite failures counted.
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* extra/Configs/Config.in: enable UCLIBC_HAS_THREADS_NATIVE on
TARGET_arm.
Signed-off-by: Christophe Lyon <christophe.lyon@st.com>
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* extra/Configs/Config.in.arch: Add TARGET_arm to the target list
for UCLIBC_FORMAT_FDPIC_ELF.
Signed-off-by: Mickaël Guêné <mickael.guene@st.com>
Signed-off-by: Christophe Lyon <christophe.lyon@st.com>
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Only a simple hello world is tested in qemu system emulation.
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This adds basic support for tile architecture.
Only static binaries, no ld.so or threading support.
Tested with qemu-tilegx only.
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OpenBSD arc4random is using chacha20 cipher algorithm for
a long time. This copy is still based on deprecated rc4
cipher algorithm. We could either update the arc4random.c
or drop it. Drop it. Users should better use libbsd when
using arc4random interface. Musl/glibc does not have arc4random
either.
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Port over NPTL/TLS support from GNU C Library.
In the first step only the slower syscall is used for TLS
access. The uClibc-ng testsuite shows 79 errors, so their
is room for bugfixes and improvements.
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Pass the -mcpu and -mhard-float from UCLIBC_EXTRA_CFLAGS instead.
Signed-off-by: Guo Ren <ren_guo@c-sky.com>
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Follow the steps to build c-sky uclibc linux system:
1. git clone https://github.com/c-sky/buildroot.git
2. cd buildroot
3. make qemu_csky_ck810_uclibc_defconfig
4. make
Follow the buildroot/board/qemu/csky/readme.txt to run.
This buildroot toolchain is pre-build, But you can rebuild
the c-sky uclibc-ng alone and install it to the buildroot
sysroot manually.
We'll try our best to improve the uclibc-ng continuously.
Signed-off-by: Guo Ren <ren_guo@c-sky.com>
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In cde74b83f9b2 "ARC: remove special CFLAGS/LDFLAGS handling" we
got rid of CONFIG_ARC_CPU_HS which was used to select ARCv2-specific
implementation of optimized string routines. So now ARCv2-tuned
memset/memcpy/strcmp are not used, instead those for ARC700 used for
both ARC700 and ARCHS.
Without uClibc config option we may only tell which CPU type we're
targeting by built-in defines of GCC. I.e. no more conditional file
inclusion in Makefiles. That leaves us only one option - merge both
implementations in 1 file and use ifdefs.
Signed-off-by: Alexey Brodkin <abrodkin@synopsys.com>
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No NPTL, no LDSO support.
Bootup with Busybox Ash in Qemu working.
Testuite shows only two failures, but mksh continue/break
support doesn't work.
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Signed-off-by: Waldemar Brodkorb <wbx@openadk.org>
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Signed-off-by: Waldemar Brodkorb <wbx@openadk.org>
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If you enable these wrappers, be sure you don't need long double
precision on your embedded device, as these only enables
long double warpper functions to the existing double math
functions. Required to build some software as lvm2.
Signed-off-by: Waldemar Brodkorb <wbx@uclibc-ng.org>
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Signed-off-by: Waldemar Brodkorb <wbx@openadk.org>
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Signed-off-by: Waldemar Brodkorb <wbx@openadk.org>
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Either toolchain defaults or buildsystems should provide the
architecture specific CFLAGS and LDFLAGS.
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The included RPC implementation is ipv4 only.
Other C library projects have either deprecated the internal
RPC implementation (GNU C Library) or never implemented such
functionality (musl C Library). The latest rpcbind release (0.2.4)
checks for libtirpc and does not allow to be build with uClibc-ng
RPC without patching. The common use case for RPC nowadays is to
use rpcbind together with nfs-utils to provide NFS server or client
support to a system.
The included RPC implementation does create issues with duplicate
symbol failures when statically compiling with RPC enabled.
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Ported over from GNU C Library and runtime tested in Qemu.
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Otherwise, buildroot rejects uClibc-ng in an external toolchain.
Signed-off-by: Alexey Neyman <stilor@att.net>
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