MIPS: Fix disassembler for J and JAL instructions.

src/mips/disasm-mips.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // A Disassembler object is used to disassemble a block of code instruction by
 // instruction. The default implementation of the NameConverter object can be
 // overriden to modify register names or to do symbol lookup on addresses.
 //
 // The example below will disassemble a block of code and print it to stdout.
 //
@@ skipping 334 matching lines @@
   imm21 >>= (32 - kImm21Bits);
   out_buffer_pos_ +=
       SNPrintF(out_buffer_ + out_buffer_pos_, "%s",
                converter_.NameOfAddress(reinterpret_cast<byte*>(instr) +
                                         delta_pc + (imm21 << n_bits)));
 }
 
 
 // Print 26-bit hex immediate value.
 void Decoder::PrintXImm26(Instruction* instr) {
-  uint32_t imm = instr->Imm26Value() << kImmFieldShift;
-  out_buffer_pos_ += SNPrintF(out_buffer_ + out_buffer_pos_, "0x%x", imm);
+  uint32_t target = static_cast<uint32_t>(instr->Imm26Value())
+                    << kImmFieldShift;
+  target = (reinterpret_cast<uint32_t>(instr) & ~0xfffffff) | target;
+  out_buffer_pos_ += SNPrintF(out_buffer_ + out_buffer_pos_, "0x%x", target);
 }
 
 
 // Print 26-bit signed immediate value.
 void Decoder::PrintSImm26(Instruction* instr) {
   int32_t imm26 = instr->Imm26Value();
   // set sign
   imm26 <<= (32 - kImm26Bits);
   imm26 >>= (32 - kImm26Bits);
   out_buffer_pos_ += SNPrintF(out_buffer_ + out_buffer_pos_, "%d", imm26);
@@ skipping 1338 matching lines @@
         prev_pc, *reinterpret_cast<int32_t*>(prev_pc), buffer.start());
   }
 }
 
 
 #undef UNSUPPORTED
 
 }  // namespace disasm
 
 #endif  // V8_TARGET_ARCH_MIPS