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2023-12-12elf: support ELF binaries in noMMUGreg Ungerer
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>
2018-08-10Allow to select FDPIC ELF for arm architectureChristophe Lyon
* 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>
2018-03-04fenv: only allow for ppc e500Waldemar Brodkorb
2017-12-03fenv: only allow to enable for supported architecturesWaldemar Brodkorb
2017-04-16libm: allow long double wrappers for all architecturesWaldemar Brodkorb
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>
2017-04-08math: no reason to depend on special architectureWaldemar Brodkorb
Signed-off-by: Waldemar Brodkorb <wbx@openadk.org>
2017-02-01add experimental aarch64 supportWaldemar Brodkorb
Ported over from GNU C Library and runtime tested in Qemu.
2016-05-18remove linuxthreads.new, rename linuxthreads.oldWaldemar Brodkorb
Linuxthreads.new isn't really useful with the existence of NPTL/TLS for well supported architectures. There is no reason to use LT.new for ARM/MIPS or other architectures supporting NPTL/TLS. It is not available for noMMU architectures like Blackfin or FR-V. To simplify the live of the few uClibc-ng developers, LT.new is removed and LT.old is renamed to LT. LINUXTHREADS_OLD -> UCLIBC_HAS_LINUXTHREADS
2016-02-07frv: resurrect port somehow, totally untestedWaldemar Brodkorb
The FR-V port is really broken, and I have no emulator or hardware for this platform. I tried to get some hardware from RedHat, who made the FR-V port initially. Unfortunately Fujitsi didn't agreed to sent me some of their unused spare hardware lying @RedHat. As I invested some time to get stuff compiled, I decided to add the code and may be anytime later I can gain access to some emulator or hardware. GDB simulator for FR-V doesn't support booting Linux AFAIK.
2015-03-24libm: honor NO_LONG_DOUBLE in ldouble_wrappersBernhard Reutner-Fischer
Fixes SH build breakage due to attempts to define hidden defs for unavailable long double functions. Signed-off-by: Bernhard Reutner-Fischer <rep.dot.nop@gmail.com>
2014-11-10Config.in.arch: enable long double math for xtensaMax Filippov
Signed-off-by: Max Filippov <jcmvbkbc@gmail.com> Signed-off-by: Bernhard Reutner-Fischer <rep.dot.nop@gmail.com>
2013-02-20Config.in: Introduce symbol for arches with deprecated syscallsMarkos Chandras
Linuxthreads(old and new) need deprecated syscalls to build. Existing architectures support these system calls but new architectures don't. This symbol has no functional change apart from hidding the Linuxthreads symbols from arches that don't support them. Signed-off-by: Markos Chandras <markos.chandras@imgtec.com> Signed-off-by: Bernhard Reutner-Fischer <rep.dot.nop@gmail.com>
2013-01-26buildsys: allow the toolchain to search its dirs for kernel headersMike Frysinger
Setting KERNEL_HEADERS up to the exact path all the time is a pita, especially when the toolchain is often times already configured to do the right thing. So if the user has set that to "", don't force any specific paths. Signed-off-by: Mike Frysinger <vapier@gentoo.org>
2013-01-10buildsys: remove superfluous default nBernhard Reutner-Fischer
kconfig's default defaults to n so spelling out default n is redundant Signed-off-by: Bernhard Reutner-Fischer <rep.dot.nop@gmail.com>
2012-06-15Config.in.arch: remove UCLIBC_FORMAT_ELF config optionPeter S. Mazinger
Unused option (and is in !ARCH_HAS_MMU guarded section, but depends on ARCH_HAS_MMU) Signed-off-by: Peter S. Mazinger <ps.m@gmx.net> Signed-off-by: Bernhard Reutner-Fischer <rep.dot.nop@gmail.com>
2011-10-06microblaze has long double support tooRyan Flux
Signed-off-by: Ryan Flux <ryan.flux@emsolutions.com.au> Signed-off-by: Steve Bennett <steveb@workware.net.au> Signed-off-by: Bernhard Reutner-Fischer <rep.dot.nop@gmail.com>
2011-07-01Config.in.arch: Free UCLIBC_HAS_FPU setting from depending on UCLIBC_HAS_FLOATSKhem Raj
UCLIBC_HAS_FLOATS and UCLIBC_HAS_FPU are denoting two different aspects. UCLIBC_HAS_FLOATS covers the floating point operations which has nothing to do if you have FPU or not. Signed-off-by: Khem Raj <raj.khem@gmail.com>
2011-03-05The C6X portAurelien Jacquiot
This adds support for the TI C6X family of processors. Signed-off-by: Mark Salter <msalter@redhat.com> Signed-off-by: Aurelien Jacquiot <a-jacquiot@ti.com> Signed-off-by: Bernd Schmidt <bernds@codesourcery.com>
2011-02-14FORMAT_FDPIC_ELF: only for FRV and BFINBernhard Reutner-Fischer
Signed-off-by: Bernhard Reutner-Fischer <rep.dot.nop@gmail.com>
2009-11-19DO_XSI_MATH: add config knobBernhard Reutner-Fischer
Signed-off-by: Bernhard Reutner-Fischer <rep.dot.nop@gmail.com>
2009-09-14Revert "default ?conf to native arch"Bernhard Reutner-Fischer
This reverts commit 6625518cd6894338937a74ca6b9187b7b8167b03. Signed-off-by: Bernhard Reutner-Fischer <rep.dot.nop@gmail.com>
2009-08-25default ?conf to native archBernhard Reutner-Fischer
Default is now the native arch, you can start a fresh .config via 'make ARCH=ia64 menuconfig'. Signed-off-by: Bernhard Reutner-Fischer <rep.dot.nop@gmail.com>
2009-07-26enable sbrk() for everyoneMike Frysinger
The sbrk() function can be used to merely query sizes and for that, no-mmu works the same as mmu. It can also sometimes increase data segments on no-mmu systems provided the trailing memory is free. So, there is no real reason to exclude this function for no-mmu ports. Signed-off-by: Mike Frysinger <vapier@gentoo.org>
2009-03-14force DOPIC for FDPIC ELF targetsMike Frysinger
2009-03-05Make long double support available for sh too.Carmelo Amoroso
Signed-off-by: Carmelo Amoroso <carmelo.amoroso@st.com>
2008-10-06- mention the architectures that currently support fenv(3).Bernhard Reutner-Fischer
i387 works (could be that it works on x86_64, untested), sse code disabled.
2008-10-03- add long double math wrappers (Ned Ludd)Bernhard Reutner-Fischer
2008-06-05- fix keyword "depends on"Bernhard Reutner-Fischer
2008-01-19- wrap superlong linesBernhard Reutner-Fischer
2008-01-19- add C99 floating point environment, rounding and exception handling functionsBernhard Reutner-Fischer
for i386. UCLIBC_HAS_FENV
2007-02-18default to pulling kernel headers from the system installMike Frysinger
2006-12-17for now, dont allow mmu users to select file formatMike Frysinger
2006-12-12we just want the kernel headers, not the whole kernel source ... so people ↵Mike Frysinger
may need to update their paths slightly
2006-12-11disable LDSO when FLAT format is selectedMike Frysinger
2006-12-11create new menu so people can select what format they wish to build uClibcMike Frysinger
2006-02-19update MMU config options to utilize USE_MMU instead of HAS_MMUMike Frysinger
2006-02-18tweak the idea between having a MMU and actually using itMike Frysinger
2006-02-18improve MMU selection a little to be less confusingMike Frysinger
2006-02-18simplify endian config/selectionMike Frysinger
2006-01-20didnt mean to commit the FENV option just yetMike Frysinger
2006-01-20s/TARGET_ARCH_FEATURES/FORCE_OPTIONS_FOR_ARCH/ to fix sed breakage as ↵Mike Frysinger
pointed out by Joseph S. Myers
2006-01-19Get rid of *_SYMBOL_PREFIXPeter S. Mazinger
2006-01-18change HAS_FPU to UCLIBC_HAS_FPU since the define will be exported into C ↵Mike Frysinger
namespace
2005-11-11remove unused ARCH_LDFLAGS and touchup broken whitespaceMike Frysinger
2005-10-28frv seems to be an exception having no MMU, but using ldsoPeter S. Mazinger
2005-10-27ARCH_HAS_NO_MMU implies/selects ARCH_HAS_NO_LDSOPeter S. Mazinger
2005-03-16move the compiler flags WARNINGS optionMike Frysinger
2004-01-16s/UCLIBC_HAS_MMU/ARCH_HAS_MMU/gEric Andersen
2004-01-16Fixup selection of endianness, since select does not work on choiceEric Andersen
items, we have to declare what endianness cpus are capable of supporting and work using dependancies.
2003-11-18Kill ARCH_HAS_NO_MMU and use HAS_FPU only. Wether floating point opsManuel Novoa III
are implemented in hardware or via kernel emulation doesn't matter to the libc code.
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