[PULL REQUEST v2] FDPIC ELF support for ARM

[Nicolas Pitre]

Russell,

Same deal as with the other pull request: now based on v4.13 otherwise 
unchanged.  Please pull.

Thanks.


On Tue, 29 Aug 2017, Nicolas Pitre wrote:

> Russell, could you please pull the following:
> 
>   http://git.linaro.org/people/nicolas.pitre/linux fdpic
> 
> This series provides the needed changes to suport the ELF_FDPIC binary
> format on ARM. Both MMU and non-MMU systems are supported. This format
> has many advantages over the BFLT format used on MMU-less systems, such
> as being real ELF that can be parsed by standard tools, can support
> shared dynamic libs, etc.
> 
> This is based on v4.13-rc4 not to conflict with changes to signal.c
> that happened in v4.13-rc3.
> 
> A complete toolchain and prebuilt packages can be obtained here:
> 
> https://github.com/mickael-guene/fdpic_manifest
> 
> Changes from v1:
> 
> - Reworked the signal return code to be compatible with a non-executable
>   stack.
> - Rebased on v4.13-rc4 to pick up latest signal changes.
> - Added MMU support.
> - Fixed crash in the ELF-FDPIC loader when loading an executable with
>   shared libs on a system with an MMU.
> - Made the regular ELF loader reject FDPIC binaries.
> - Added ACKs and Reviewed-bys.
> 
> diffstat:
> 
>  arch/arm/include/asm/elf.h         | 16 +++++++--
>  arch/arm/include/asm/mmu.h         |  8 +++++
>  arch/arm/include/asm/processor.h   | 22 +++++++++----
>  arch/arm/include/asm/ucontext.h    |  1 +
>  arch/arm/include/uapi/asm/ptrace.h |  4 +++
>  arch/arm/include/uapi/asm/unistd.h |  1 +
>  arch/arm/kernel/asm-offsets.c      |  4 +++
>  arch/arm/kernel/elf.c              | 24 +++++++++++++-
>  arch/arm/kernel/signal.c           | 53 +++++++++++++++++++++---------
>  arch/arm/kernel/signal.h           | 11 +++++++
>  arch/arm/kernel/sigreturn_codes.S  | 56 +++++++++++++++++++++++++++++---
>  arch/arm/kernel/traps.c            |  3 ++
>  fs/Kconfig.binfmt                  |  4 +--
>  fs/binfmt_elf.c                    | 15 +++++++--
>  fs/binfmt_elf_fdpic.c              | 13 ++++++--
>  15 files changed, 199 insertions(+), 36 deletions(-)
>