[Bug ld/22970] New: Add support for R_AARCH64_TLSLE_LDST8_TPREL_LO12 relocation.

[peter.smith at linaro dot org]

https://sourceware.org/bugzilla/show_bug.cgi?id=22970

            Bug ID: 22970
           Summary: Add support for R_AARCH64_TLSLE_LDST8_TPREL_LO12
                    relocation.
           Product: binutils
           Version: unspecified
            Status: UNCONFIRMED
          Severity: enhancement
          Priority: P2
         Component: ld
          Assignee: unassigned at sourceware dot org
          Reporter: peter.smith at linaro dot org
  Target Milestone: ---

This enhancement has the same text as:
https://sourceware.org/bugzilla/show_bug.cgi?id=22969 but applies to ld.bfd and
not ld.gold.

In a recent change to LLVM (https://reviews.llvm.org/D44355) an attempt was
made to fold the add and the ldr in the sequence:

mrs x1, TPIDR_EL0
add x2, x1, :tprel_hi12:local_exec_var
add x3, x2, :tprel_lo12_nc:local_exec_var
ldr w0, [x3]

to:

mrs x1, TPIDR_EL0
add x2, x1, :tprel_hi12:local_exec_var
ldr w0, [x2, :tprel_lo12_nc:local_exec_var]

Unfortunately for this to work support is needed for the
R_AARCH_TLSLE_LDST8_TPREL_LO12 relocation that 
ldr w0, [x2, :tprel_lo12_nc:local_exec_var] uses.

It looks like only R_AARCH64_TLSLE_ADD_TPREL_LO12 is supported in binutils
trunk (gold and bfd right now). It would be nice to add support for that
relocation to enable the relaxation.

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