Hi Christophe, i am doing a large testrun for the global changes and hopefully push on monday or at least have some news. i am afk atm with just little access to a computer.
best regards Waldemar > Am 13.07.2018 um 17:43 schrieb Christophe Lyon <[email protected]>: > > Hi, > > I'd like to ping the whole series. > > For those anxious about Cortex-M support, I'd prefer to have the > current patch series merged, and then add the missing parts for > Cortex-M: I have a simple patch to enable the uclibc-ng build for such > a target, but then there are further problems with binutils and GCC. > So for me it would be much more convenient to have Cortex-A/Cortex-R > support merged, so that I can focus later on smaller improvements. > > Thanks, > > Christophe > > >> On Wed, 4 Jul 2018 at 17:56, Christophe Lyon <[email protected]> wrote: >> >> Hello, >> >> This patch series implements the uClibc-ng contribution of the FDPIC >> ABI for ARM targets. >> >> This ABI enables to run Linux on ARM MMU-less cores and supports >> shared libraries to reduce the memory footprint. >> >> Without MMU, text and data segments relative distances are different >> from one process to another, hence the need for a dedicated FDPIC >> register holding the start address of the data segment. One of the >> side effects is that function pointers require two words to be >> represented: the address of the code, and the data segment start >> address. These two words are designated as "Function Descriptor", >> hence the "FD PIC" name. >> >> On ARM, the FDPIC register is r9 [1], and the target name is >> arm-uclinuxfdpiceabi. Note that arm-uclinux exists, but uses another >> ABI and the BFLAT file format; it does not support code sharing. >> >> This work was developed some time ago by STMicroelectronics, and was >> presented during Linaro Connect SFO15 (September 2015). You can watch >> the discussion and read the slides [2]. >> This presentation was related to the toolchain published on github [3], >> which is based on binutils-2.22, gcc-4.7, uclibc-0.9.33.2, gdb-7.5.1 >> and qemu-2.3.0, and for which pre-built binaries are available [3]. >> >> The ABI itself is described in details in [1]. >> >> Our Linux kernel patches have been updated and committed by Nicolas >> Pitre (Linaro) in July 2017. They are required so that the loader is >> able to handle this new file type. Indeed, the ELF files are tagged >> with ELFOSABI_ARM_FDPIC. This new tag has been allocated by ARM, as >> well as the new relocations involved. >> >> The binutils and QEMU patch series have been merged recently. [4][5] >> >> The GCC patch series has been submitted and is under discussion. [6] >> >> This patch series consists in the original uClibc-based patches, which >> I have rebased and updated for uClibc-ng. Most of them are strictly >> related to FDPIC on ARM, while a few others address generic issues. >> >> Are the uClibc-ng patches OK for inclusion in master? >> >> Thanks, >> >> Christophe. >> >> _______________________________________________ devel mailing list [email protected] https://mailman.uclibc-ng.org/cgi-bin/mailman/listinfo/devel
