[4/16][binutils][AARCH64]Add relocation support for large memory model. [LD]Add BFD_RELOC_AARCH64_MOVW_GOTOFF_G0_NC Support.

[Renlin Li]

Sorry, the description in previous email is wrong. Here is the correct one.


This patch add BFD_RELOC_AARCH64_MOVW_GOTOFF_G1 to binutils linker.

It's used in large memory model, GOT PIC addressing.
For the large model and -fPIC, the GOT is limited to 4GB, allowing it to 
be accessed using a 32-bit unsigned register index.

// gp = &_GOT_
movz t0, #:gotoff_g1:src       // R_AARCH64_MOVW_GOTOFF_G1
movk t0, #:gotoff_g0_nc:src // R_AARCH64_MOVW_GOTOFF_G0_NC
ldr     t0, [gp, t0]


LD tests Okay without any issues. Okay to commit?



bfd/ChangeLog:

2015-09-08  Renlin Li  <renlin.li@arm.com>

     * elfnn-aarch64.c (aarch64_reloc_got_type): Add support
         for BFD_RELOC_AARCH64_MOVW_GOTOFF_G1.
     (elfNN_aarch64_gc_sweep_hook): Likewise.
     (elfNN_aarch64_check_relocs): Likewise
     * elfxx-aarch64.c (_bfd_aarch64_elf_put_addend): Likewise.
     (_bfd_aarch64_elf_resolve_relocation): Likewise
     (elfNN_aarch64_final_link_relocate): Calculate offset within GOT.


ld/testsuite/ChangeLog:

2015-09-08  Renlin Li  <renlin.li@arm.com>

     * ld-aarch64/emit-relocs-302.d: New.
     * ld-aarch64/emit-relocs-302.s: New.
     * ld-aarch64/aarch64-elf.exp: Run the new test.


On 08/09/15 17:23, Renlin Li wrote:
> Hi all,
>
> This patch add BFD_RELOC_AARCH64_TLSGD_MOVW_G0_NC to binutils linker.
>
> It's used in large memory model, GOT PIC addressing.
> For the large model and -fPIC, the GOT is limited to 4GB, allowing it 
> to be accessed using a 32-bit unsigned register index.
>
> // gp = &_GOT_
> movz t0, #:gotoff_g1:src // R_AARCH64_MOVW_GOTOFF_G1 src
> movk t0, #:gotoff_g0_nc:src // R_AARCH64_MOVW_GOTOFF_G0_NC src
> ldr     t0, [gp, t0]
>
>
> LD tests Okay without any issues. Okay to commit?
>
> bfd/ChangeLog:
>
> 2015-09-08  Renlin Li  <renlin.li@arm.com>
>
>     * elfnn-aarch64.c (aarch64_reloc_got_type): Add
>         BFD_RELOC_AARCH64_TLSGD_MOVW_G0_NC support.
>     (elfNN_aarch64_final_link_relocate): Likewise.
>     (elfNN_aarch64_relocate_section): Likewise.
>     (elfNN_aarch64_gc_sweep_hook): Likewise.
>     (elfNN_aarch64_check_relocs): Likewise.
>     * elfxx-aarch64.c (_bfd_aarch64_elf_put_addend): Likewise.
>     (_bfd_aarch64_elf_resolve_relocation): Likewise.
>
> ld/testsuite/ChangeLog:
>
> 2015-09-08  Renlin Li  <renlin.li@arm.com>
>
>     * ld-aarch64/emit-relocs-516.d: New.
>     * ld-aarch64/emit-relocs-516.s: New.
>     * ld-aarch64/aarch64-elf.exp: Run new test.

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