ARM64: Introduce a version of ADR handling distant targets.

src/arm64/instructions-arm64.cc

 // Copyright 2013 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 236 matching lines @@
   } else if (BranchType() != UnknownBranchType) {
     SetBranchImmTarget(target);
   } else {
     SetImmLLiteral(target);
   }
 }
 
 
 void Instruction::SetPCRelImmTarget(Instruction* target) {
   // ADRP is not supported, so 'this' must point to an ADR instruction.
-  ASSERT(Mask(PCRelAddressingMask) == ADR);
+  ASSERT(IsAdr());
 
-  Instr imm = Assembler::ImmPCRelAddress(DistanceTo(target));
-
-  SetInstructionBits(Mask(~ImmPCRel_mask) | imm);
+  int target_offset = DistanceTo(target);
+  Instr imm;
+  if (Instruction::IsValidPCRelOffset(target_offset)) {
+    imm = Assembler::ImmPCRelAddress(target_offset);
+    SetInstructionBits(Mask(~ImmPCRel_mask) | imm);
+  } else {
+    PatchingAssembler patcher(this,
+                              PatchingAssembler::kAdrFarPatchableNInstrs);
+    patcher.PatchAdrFar(target);
+  }
 }
 
 
 void Instruction::SetBranchImmTarget(Instruction* target) {
   ASSERT(IsAligned(DistanceTo(target), kInstructionSize));
   Instr branch_imm = 0;
   uint32_t imm_mask = 0;
   ptrdiff_t offset = DistanceTo(target) >> kInstructionSizeLog2;
   switch (BranchType()) {
     case CondBranchType: {
@@ skipping 52 matching lines @@
   uint64_t payload = ImmMoveWide();
   // TODO(all): If we extend ::InlineData() to support bigger data, we need
   // to update this method too.
   return payload;
 }
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_ARM64