MIPS: Implement unaligned access instruction.

src/mips/simulator-mips.cc

 // Copyright 2011 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.
 
 #include <limits.h>
 #include <stdarg.h>
 #include <stdlib.h>
 #include <cmath>
 
 #if V8_TARGET_ARCH_MIPS
@@ skipping 1773 matching lines @@
 
 
 int Simulator::ReadW(int32_t addr, Instruction* instr) {
   if (addr >=0 && addr < 0x400) {
     // This has to be a NULL-dereference, drop into debugger.
     PrintF("Memory read from bad address: 0x%08x, pc=0x%08" PRIxPTR "\n", addr,
            reinterpret_cast<intptr_t>(instr));
     MipsDebugger dbg(this);
     dbg.Debug();
   }
-  if ((addr & kPointerAlignmentMask) == 0) {
+  if ((addr & kPointerAlignmentMask) == 0 || IsMipsArchVariant(kMips32r6)) {
     intptr_t* ptr = reinterpret_cast<intptr_t*>(addr);
     TraceMemRd(addr, static_cast<int32_t>(*ptr));
     return *ptr;
   }
   PrintF("Unaligned read at 0x%08x, pc=0x%08" V8PRIxPTR "\n",
          addr,
          reinterpret_cast<intptr_t>(instr));
   MipsDebugger dbg(this);
   dbg.Debug();
   return 0;
 }
 
 
 void Simulator::WriteW(int32_t addr, int value, Instruction* instr) {
   if (addr >= 0 && addr < 0x400) {
     // This has to be a NULL-dereference, drop into debugger.
     PrintF("Memory write to bad address: 0x%08x, pc=0x%08" PRIxPTR "\n", addr,
            reinterpret_cast<intptr_t>(instr));
     MipsDebugger dbg(this);
     dbg.Debug();
   }
-  if ((addr & kPointerAlignmentMask) == 0) {
+  if ((addr & kPointerAlignmentMask) == 0 || IsMipsArchVariant(kMips32r6)) {
     intptr_t* ptr = reinterpret_cast<intptr_t*>(addr);
     TraceMemWr(addr, value, WORD);
     *ptr = value;
     return;
   }
   PrintF("Unaligned write at 0x%08x, pc=0x%08" V8PRIxPTR "\n",
          addr,
          reinterpret_cast<intptr_t>(instr));
   MipsDebugger dbg(this);
   dbg.Debug();
 }
 
 
 double Simulator::ReadD(int32_t addr, Instruction* instr) {
-  if ((addr & kDoubleAlignmentMask) == 0) {
+  if ((addr & kDoubleAlignmentMask) == 0 || IsMipsArchVariant(kMips32r6)) {
     double* ptr = reinterpret_cast<double*>(addr);
     return *ptr;
   }
   PrintF("Unaligned (double) read at 0x%08x, pc=0x%08" V8PRIxPTR "\n",
          addr,
          reinterpret_cast<intptr_t>(instr));
   base::OS::Abort();
   return 0;
 }
 
 
 void Simulator::WriteD(int32_t addr, double value, Instruction* instr) {
-  if ((addr & kDoubleAlignmentMask) == 0) {
+  if ((addr & kDoubleAlignmentMask) == 0 || IsMipsArchVariant(kMips32r6)) {
     double* ptr = reinterpret_cast<double*>(addr);
     *ptr = value;
     return;
   }
   PrintF("Unaligned (double) write at 0x%08x, pc=0x%08" V8PRIxPTR "\n",
          addr,
          reinterpret_cast<intptr_t>(instr));
   base::OS::Abort();
 }
 
 
 uint16_t Simulator::ReadHU(int32_t addr, Instruction* instr) {
-  if ((addr & 1) == 0) {
+  if ((addr & 1) == 0 || IsMipsArchVariant(kMips32r6)) {
     uint16_t* ptr = reinterpret_cast<uint16_t*>(addr);
     TraceMemRd(addr, static_cast<int32_t>(*ptr));
     return *ptr;
   }
   PrintF("Unaligned unsigned halfword read at 0x%08x, pc=0x%08" V8PRIxPTR "\n",
          addr,
          reinterpret_cast<intptr_t>(instr));
   base::OS::Abort();
   return 0;
 }
 
 
 int16_t Simulator::ReadH(int32_t addr, Instruction* instr) {
-  if ((addr & 1) == 0) {
+  if ((addr & 1) == 0 || IsMipsArchVariant(kMips32r6)) {
     int16_t* ptr = reinterpret_cast<int16_t*>(addr);
     TraceMemRd(addr, static_cast<int32_t>(*ptr));
     return *ptr;
   }
   PrintF("Unaligned signed halfword read at 0x%08x, pc=0x%08" V8PRIxPTR "\n",
          addr,
          reinterpret_cast<intptr_t>(instr));
   base::OS::Abort();
   return 0;
 }
 
 
 void Simulator::WriteH(int32_t addr, uint16_t value, Instruction* instr) {
-  if ((addr & 1) == 0) {
+  if ((addr & 1) == 0 || IsMipsArchVariant(kMips32r6)) {
     uint16_t* ptr = reinterpret_cast<uint16_t*>(addr);
     TraceMemWr(addr, value, HALF);
     *ptr = value;
     return;
   }
   PrintF("Unaligned unsigned halfword write at 0x%08x, pc=0x%08" V8PRIxPTR "\n",
          addr,
          reinterpret_cast<intptr_t>(instr));
   base::OS::Abort();
 }
 
 
 void Simulator::WriteH(int32_t addr, int16_t value, Instruction* instr) {
-  if ((addr & 1) == 0) {
+  if ((addr & 1) == 0 || IsMipsArchVariant(kMips32r6)) {
     int16_t* ptr = reinterpret_cast<int16_t*>(addr);
     TraceMemWr(addr, value, HALF);
     *ptr = value;
     return;
   }
   PrintF("Unaligned halfword write at 0x%08x, pc=0x%08" V8PRIxPTR "\n",
          addr,
          reinterpret_cast<intptr_t>(instr));
   base::OS::Abort();
 }
@@ skipping 2698 matching lines @@
 
 
 #undef UNSUPPORTED
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // USE_SIMULATOR
 
 #endif  // V8_TARGET_ARCH_MIPS