[AArch64][TLSLE][1/N] Rename SYMBOL_SMALL_TPREL to SYMBOL_TLSLE

[Jiong Wang]

For AArch64, TLS local-exec mode for all memory model (tiny/small/large)
is actually the same.

TLS LE Instruction generation depends on how big tls section is instead
of the memory model used.

The four instruction sequences we can implement based on relocations
provided:

sequence 1
==========
  add  t0, tp, #:tprel_lo12:x1           R_AARCH64_TLSLE_ADD_TPREL_LO12       x1

sequence 2
==========
  add  t0, tp, #:tprel_hi12:x1, lsl #12  R_AARCH64_TLSLE_ADD_TPREL_HI12       x2
  add  t0, #:tprel_lo12_nc:x1            R_AARCH64_TLSLE_ADD_TPREL_LO12_NC    x2

sequence 2
==========
  movz t0, #:tprel_g1:x3                 R_AARCH64_TLSLE_MOVW_TPREL_G1        x3
  movk t0, #:tprel_g0_nc:x3              R_AARCH64_TLSLE_MOVW_TPREL_G0_NC     x3
  add  t0, tp, t0

sequence 4
==========
  movz t0, #:tprel_g2:x4                 R_AARCH64_TLSLE_MOVW_TPREL_G2        x4
  movk t0, #:tprel_g1_nc:x4              R_AARCH64_TLSLE_MOVW_TPREL_G1_NC     x4
  movk t0, #:tprel_g0_nc:x4              R_AARCH64_TLSLE_MOVW_TPREL_G0_NC     x4
  add  t0, t0, tp

Under tiny model, we still can't use the simplest sequence 1, because
the allowed loadable segment size is 1M, while 12bit offset (4K) still
can't access.

While even under large model, if the tls-size is small than 4K, we still can use
the simplest sequence 1 for local-exec.

This is the first patch to cleanup TLSLE support which generalize
TLSE variable/marco name for all memory models.

OK for trunk?

2015-05-19  Marcus Shawcroft  <marcus.shawcroft@arm.com>
            Jiong Wang  <jiong.wang@arm.com>

gcc/
  * config/aarch64/aarch64-protos.h (arch64_symbol_type): Rename
  SYMBOL_SMALL_TPREL to SYMBOL_TLSLE.
  (aarch64_symbol_context): Ditto.
  * config/aarch64/aarch64.c (aarch64_load_symref_appropriately): Ditto.
  (aarch64_expand_mov_immediate): Ditto.
  (aarch64_print_operand): Ditto.
  (aarch64_classify_tls_symbol): Ditto.
-- 
Regards,
Jiong

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