[PR22764][LD][AARCH64]Allow R_AARCH64_ABS16 and R_AARCH64_ABS32 against absolution symbol or undefine symbol in shared object under LP64 abi.

[Renlin Li]

Hi all,

The assumption that R_AARCH64_ABS16 and R_AARCH64_ABS32 relocation in LP64 abi
will be used to generate an address does not hold for absolute symbol.
In this case, it is a value fixed at static linking time.

The condition to check the relocations is relax to allow absolute symbol and
undefined symbol case.

aarch64 binutils cross/native regression test Okay. Linux kernel link Okay.

Okay to commit and backport to 2.30 branch?

Regards,
Renlin

bfd/ChangeLog:

2018-02-03  Renlin Li  <renlin.li@arm.com>

         PR ld/22764
         * elfnn-aarch64.c (elfNN_aarch64_check_relocs): Relax the
         R_AARCH64_ABS32 and R_AARCH64_ABS16 for absolute symbol. Apply the
         check for writable section as well.

ld/ChangeLog:

2018-02-03  Renlin Li  <renlin.li@arm.com>

         PR ld/22764
         * testsuite/ld-aarch64/emit-relocs-258.s: Define symbol as an address.
         * testsuite/ld-aarch64/emit-relocs-259.s: Likewise.
         * ld/testsuite/ld-aarch64/aarch64-elf.exp: Run new test.
         * testsuite/ld-aarch64/pr22764.s: New.
         * testsuite/ld-aarch64/pr22764.d: New.
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