[PATCH, ARM, 0/10] Add support for ARMv8-R

[Thomas Preudhomme]

Hi,

This patch series adds support for ARMv8-R to binutils. It mainly consists of 
some improvement to the build attribute selection in GAS and necessary 
refactoring for this to happen. Only 3 patches are concerned with actually 
adding support for ARMv8-R. The details are as follows:

[ 1/10] Separate extensions from architectures in arm_cpus
[ 2/10] Keep separation between extensions and architecture bits throughout 
execution
Build attributes are mostly based on the base architecture (ie. without 
extensions) so we need to distinguish those two. Keeping the two separate 
instead of having a feature set for base and another one for base+ext is useful 
because in some cases extension participate in build attribute selection.

[ 3/10] Simplify Tag_DSP_extension selection logic
Now that the extension feature set is available, we can test for that build 
attribute more easily and naturally (attribute is defined in term of feature 
being provided by extension)

[ 4/10] Rework selection of feature bits to base build attributes on
Selection of feature bits to use for build atribute selection used to mix things 
that were detected from things that were selected, thus losing precious 
information for the build attribute selection logic. This patch keeps the two 
cases separate.

[ 5/10] Allow Thumb division as an extension for ARMv7
Allow code with SDIV and UDIV instructions to be auto detected as ARMv7 with div 
extension

[ 6/10] Rework Tag_CPU_arch build attribute value selection
The actual rework to the build attribute selection. Main objectives are (i) to 
select flags according to what architecture/core the user selected (if something 
was selected) and not based on features present and (ii) error out in auto 
detection mode if no architecture provides all instructions used

[ 7/10] Remove ARMv6S-M special casing
Some code was special casing ARMv6S-M under the old build attribute selection 
logic and is not necessary anymore.

[ 8/10] Add support for ARMv8-R in assembler and readelf
[ 9/10] Add linker support for ARMv8-R
[10/10] Add support for ARM Cortex-R52 processor
Self explanatory

Best regards,

Thomas