[Gold, aarch64] Implement some AArch64 relocs.

This CL implemented the following relocs for AArch64 target.
  - R_AARCH64_MOVW_UABS_G*
  - R_AARCH64_MOVW_SABS_G* relocations

gold/ChangeLog

2016-07-26 Igor Kudrin  <ikudrin@accesssoftek.com>

    * aarch64-reloc-property.cc (Rvalue_bit_select_impl): New class.
    (rvalue_bit_select): Use Rvalue_bit_select_impl.
    * aarch64-reloc.def (MOVW_UABS_G0, MOVW_UABS_G0_NC,
    MOVW_UABS_G1,
    MOVW_UABS_G1_NC, MOVW_UABS_G2, MOVW_UABS_G2_NC, MOVW_UABS_G3,
    MOVW_SABS_G0, MOVW_SABS_G1, MOVW_SABS_G2): New relocations.
    * aarch64.cc (Target_aarch64::Scan::local): Add cases for new
    MOVW_UABS_* and MOVW_SABS_* relocations.
    (Target_aarch64::Scan::global): Likewise.
    (Target_aarch64::Relocate::relocate): Add cases and handlings
    for new MOVW_UABS_* and MOVW_SABS_* relocations.
    * testsuite/Makefile.am (aarch64_relocs): New test.
    * testsuite/Makefile.in: Regenerate.
    * testsuite/aarch64_globals.s: New test source file.
    * testsuite/aarch64_relocs.s: Likewise.
    * testsuite/aarch64_relocs.sh: New test script.

1 files changed, 40 insertions, 6 deletions

diff --git a/gold/aarch64-reloc-property.cc b/gold/aarch64-reloc-property.cc
index bf521d7..d0dee40 100644
--- a/gold/aarch64-reloc-property.cc
+++ b/gold/aarch64-reloc-property.cc
@@ -59,18 +59,52 @@ template<>
 bool
 rvalue_checkup<0, 0>(int64_t) { return true; }
 
+namespace
+{
+
+template<int L, int U>
+class Rvalue_bit_select_impl
+{
+public:
+  static uint64_t
+  calc(uint64_t x)
+  {
+    return (x & ((1ULL << (U+1)) - 1)) >> L;
+  }
+};
+
+template<int L>
+class Rvalue_bit_select_impl<L, 63>
+{
+public:
+  static uint64_t
+  calc(uint64_t x)
+  {
+    return x >> L;
+  }
+};
+
+// By our convention, L=U=0 means that the whole value should be retrieved.
+template<>
+class Rvalue_bit_select_impl<0, 0>
+{
+public:
+  static uint64_t
+  calc(uint64_t x)
+  {
+    return x;
+  }
+};
+
+} // End anonymous namespace.
+
 template<int L, int U>
 uint64_t
 rvalue_bit_select(uint64_t x)
 {
-  if (U == 63) return x >> L;
-  return (x & (((uint64_t)1 << (U+1)) - 1)) >> L;
+  return Rvalue_bit_select_impl<L, U>::calc(x);
 }
 
-template<>
-uint64_t
-rvalue_bit_select<0, 0>(uint64_t x) { return x; }
-
 AArch64_reloc_property::AArch64_reloc_property(
     unsigned int code,
     const char* name,