MIPS: Implemented PC-relative instructions for R6.

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 63 matching lines @@
   void PrintRd(Instruction* instr);
   void PrintFs(Instruction* instr);
   void PrintFt(Instruction* instr);
   void PrintFd(Instruction* instr);
   void PrintSa(Instruction* instr);
   void PrintSd(Instruction* instr);
   void PrintSs1(Instruction* instr);
   void PrintSs2(Instruction* instr);
   void PrintBc(Instruction* instr);
   void PrintCc(Instruction* instr);
+  void PrintBp2(Instruction* instr);
   void PrintFunction(Instruction* instr);
   void PrintSecondaryField(Instruction* instr);
   void PrintUImm16(Instruction* instr);
   void PrintSImm16(Instruction* instr);
   void PrintXImm16(Instruction* instr);
+  void PrintXImm18(Instruction* instr);
+  void PrintSImm18(Instruction* instr);
+  void PrintXImm19(Instruction* instr);
+  void PrintSImm19(Instruction* instr);
   void PrintXImm21(Instruction* instr);
+  void PrintSImm21(Instruction* instr);
   void PrintXImm26(Instruction* instr);
   void PrintCode(Instruction* instr);   // For break and trap instructions.
   void PrintFormat(Instruction* instr);  // For floating format postfix.
   // Printing of instruction name.
   void PrintInstructionName(Instruction* instr);
 
   // Handle formatting of instructions and their options.
   int FormatRegister(Instruction* instr, const char* option);
   int FormatFPURegister(Instruction* instr, const char* option);
   int FormatOption(Instruction* instr, const char* option);
@@ skipping 129 matching lines @@
 }
 
 
 // Print the integer value of the cc field for the FP compare instructions.
 void Decoder::PrintCc(Instruction* instr) {
   int cc = instr->FCccValue();
   out_buffer_pos_ += SNPrintF(out_buffer_ + out_buffer_pos_, "cc(%d)", cc);
 }
 
 
+void Decoder::PrintBp2(Instruction* instr) {
+  int bp2 = instr->Bp2Value();
+  out_buffer_pos_ += SNPrintF(out_buffer_ + out_buffer_pos_, "%d", bp2);
+}
+
+
 // Print 16-bit unsigned immediate value.
 void Decoder::PrintUImm16(Instruction* instr) {
   int32_t imm = instr->Imm16Value();
   out_buffer_pos_ += SNPrintF(out_buffer_ + out_buffer_pos_, "%u", imm);
 }
 
 
 // Print 16-bit signed immediate value.
 void Decoder::PrintSImm16(Instruction* instr) {
   int32_t imm = ((instr->Imm16Value()) << 16) >> 16;
   out_buffer_pos_ += SNPrintF(out_buffer_ + out_buffer_pos_, "%d", imm);
 }
 
 
 // Print 16-bit hexa immediate value.
 void Decoder::PrintXImm16(Instruction* instr) {
   int32_t imm = instr->Imm16Value();
   out_buffer_pos_ += SNPrintF(out_buffer_ + out_buffer_pos_, "0x%x", imm);
 }
 
 
+// Print 18-bit signed immediate value.
+void Decoder::PrintSImm18(Instruction* instr) {
+  int32_t imm =
+      ((instr->Imm18Value()) << (32 - kImm18Bits)) >> (32 - kImm18Bits);
+  out_buffer_pos_ += SNPrintF(out_buffer_ + out_buffer_pos_, "%d", imm);
+}
+
+
+// Print 18-bit hexa immediate value.
+void Decoder::PrintXImm18(Instruction* instr) {
+  int32_t imm = instr->Imm18Value();
+  out_buffer_pos_ += SNPrintF(out_buffer_ + out_buffer_pos_, "0x%x", imm);
+}
+
+
+// Print 19-bit hexa immediate value.
+void Decoder::PrintXImm19(Instruction* instr) {
+  int32_t imm = instr->Imm19Value();
+  out_buffer_pos_ += SNPrintF(out_buffer_ + out_buffer_pos_, "0x%x", imm);
+}
+
+
+// Print 19-bit signed immediate value.
+void Decoder::PrintSImm19(Instruction* instr) {
+  int32_t imm19 = instr->Imm19Value();
+  // set sign
+  imm19 <<= (32 - kImm19Bits);
+  imm19 >>= (32 - kImm19Bits);
+  out_buffer_pos_ += SNPrintF(out_buffer_ + out_buffer_pos_, "%d", imm19);
+}
+
+
 // Print 21-bit immediate value.
 void Decoder::PrintXImm21(Instruction* instr) {
   uint32_t imm = instr->Imm21Value();
   out_buffer_pos_ += SNPrintF(out_buffer_ + out_buffer_pos_, "0x%x", imm);
 }
 
 
+// Print 21-bit signed immediate value.
+void Decoder::PrintSImm21(Instruction* instr) {
+  int32_t imm21 = instr->Imm21Value();
+  // set sign
+  imm21 <<= (32 - kImm21Bits);
+  imm21 >>= (32 - kImm21Bits);
+  out_buffer_pos_ += SNPrintF(out_buffer_ + out_buffer_pos_, "%d", imm21);
+}
+
+
 // Print 26-bit 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);
 }
 
 
 // Print 26-bit immediate value.
 void Decoder::PrintCode(Instruction* instr) {
   if (instr->OpcodeFieldRaw() != SPECIAL)
@@ skipping 105 matching lines @@
 // characters that were consumed from the formatting string.
 int Decoder::FormatOption(Instruction* instr, const char* format) {
   switch (format[0]) {
     case 'c': {   // 'code for break or trap instructions.
       DCHECK(STRING_STARTS_WITH(format, "code"));
       PrintCode(instr);
       return 4;
     }
     case 'i': {   // 'imm16u or 'imm26.
       if (format[3] == '1') {
-        DCHECK(STRING_STARTS_WITH(format, "imm16"));
-        if (format[5] == 's') {
-          DCHECK(STRING_STARTS_WITH(format, "imm16s"));
-          PrintSImm16(instr);
-        } else if (format[5] == 'u') {
-          DCHECK(STRING_STARTS_WITH(format, "imm16u"));
-          PrintSImm16(instr);
-        } else {
-          DCHECK(STRING_STARTS_WITH(format, "imm16x"));
-          PrintXImm16(instr);
+        if (format[4] == '6') {
+          DCHECK(STRING_STARTS_WITH(format, "imm16"));
+          switch (format[5]) {
+            case 's':
+              DCHECK(STRING_STARTS_WITH(format, "imm16s"));
+              PrintSImm16(instr);
+              break;
+            case 'u':
+              DCHECK(STRING_STARTS_WITH(format, "imm16u"));
+              PrintSImm16(instr);
+              break;
+            case 'x':
+              DCHECK(STRING_STARTS_WITH(format, "imm16x"));
+              PrintXImm16(instr);
+              break;
+          }
+          return 6;
+        } else if (format[4] == '8') {
+          DCHECK(STRING_STARTS_WITH(format, "imm18"));
+          switch (format[5]) {
+            case 's':
+              DCHECK(STRING_STARTS_WITH(format, "imm18s"));
+              PrintSImm18(instr);
+              break;
+            case 'x':
+              DCHECK(STRING_STARTS_WITH(format, "imm18x"));
+              PrintXImm18(instr);
+              break;
+          }
+          return 6;
+        } else if (format[4] == '9') {
+          DCHECK(STRING_STARTS_WITH(format, "imm19"));
+          switch (format[5]) {
+            case 's':
+              DCHECK(STRING_STARTS_WITH(format, "imm19s"));
+              PrintSImm19(instr);
+              break;
+            case 'x':
+              DCHECK(STRING_STARTS_WITH(format, "imm19x"));
+              PrintXImm19(instr);
+              break;
+          }
+          return 6;
         }
-        return 6;
       } else if (format[3] == '2' && format[4] == '1') {
-        DCHECK(STRING_STARTS_WITH(format, "imm21x"));
-        PrintXImm21(instr);
+        DCHECK(STRING_STARTS_WITH(format, "imm21"));
+        switch (format[5]) {
+          case 's':
+            DCHECK(STRING_STARTS_WITH(format, "imm21s"));
+            PrintSImm21(instr);
+            break;
+          case 'x':
+            DCHECK(STRING_STARTS_WITH(format, "imm21x"));
+            PrintXImm21(instr);
+            break;
+        }
         return 6;
       } else if (format[3] == '2' && format[4] == '6') {
         DCHECK(STRING_STARTS_WITH(format, "imm26x"));
         PrintXImm26(instr);
         return 6;
       }
     }
     case 'r': {   // 'r: registers.
       return FormatRegister(instr, format);
     }
@@ skipping 18 matching lines @@
               PrintSs1(instr);
               return 3;
           } else {
               DCHECK(STRING_STARTS_WITH(format, "ss2"));  /* ins size */
               PrintSs2(instr);
               return 3;
           }
         }
       }
     }
-    case 'b': {   // 'bc - Special for bc1 cc field.
-      DCHECK(STRING_STARTS_WITH(format, "bc"));
-      PrintBc(instr);
-      return 2;
+    case 'b': {
+      switch (format[1]) {
+        case 'c': {  // 'bc - Special for bc1 cc field.
+          DCHECK(STRING_STARTS_WITH(format, "bc"));
+          PrintBc(instr);
+          return 2;
+        }
+        case 'p': {
+          switch (format[2]) {
+            case '2': {  // 'bp2
+              DCHECK(STRING_STARTS_WITH(format, "bp2"));
+              PrintBp2(instr);
+              return 3;
+            }
+          }
+        }
+      }
     }
     case 'C': {   // 'Cc - Special for c.xx.d cc field.
       DCHECK(STRING_STARTS_WITH(format, "Cc"));
       PrintCc(instr);
       return 2;
     }
     case 't':
       PrintFormat(instr);
       return 1;
   }
@@ skipping 475 matching lines @@
       break;
     default:
       UNREACHABLE();
   }
 }
 
 
 void Decoder::DecodeTypeRegisterSPECIAL3(Instruction* instr) {
   switch (instr->FunctionFieldRaw()) {
     case INS: {
-      if (IsMipsArchVariant(kMips32r2)) {
+      if (IsMipsArchVariant(kMips32r2) || IsMipsArchVariant(kMips32r6)) {
         Format(instr, "ins     'rt, 'rs, 'sa, 'ss2");
       } else {
         Unknown(instr);
       }
       break;
     }
     case EXT: {
-      if (IsMipsArchVariant(kMips32r2)) {
+      if (IsMipsArchVariant(kMips32r2) || IsMipsArchVariant(kMips32r6)) {
         Format(instr, "ext     'rt, 'rs, 'sa, 'ss1");
       } else {
         Unknown(instr);
       }
       break;
     }
-    case BITSWAP: {
-      if (IsMipsArchVariant(kMips32r6)) {
-        Format(instr, "bitswap 'rd, 'rt");
-      } else {
-        Unknown(instr);
+    case BSHFL: {
+      int sa = instr->SaFieldRaw() >> kSaShift;
+      switch (sa) {
+        case BITSWAP: {
+          if (IsMipsArchVariant(kMips32r6)) {
+            Format(instr, "bitswap 'rd, 'rt");
+          } else {
+            Unknown(instr);
+          }
+          break;
+        }
+        case SEB:
+        case SEH:
+        case WSBH:
+          UNREACHABLE();
+          break;
+        default: {
+          sa >>= kBp2Bits;
+          switch (sa) {
+            case ALIGN: {
+              if (IsMipsArchVariant(kMips32r6)) {
+                Format(instr, "align  'rd, 'rs, 'rt, 'bp2");
+              } else {
+                Unknown(instr);
+              }
+              break;
+            }
+            default:
+              UNREACHABLE();
+              break;
+          }
+        }
       }
       break;
     }
     default:
       UNREACHABLE();
   }
 }
 
 
 void Decoder::DecodeTypeRegister(Instruction* instr) {
@@ skipping 171 matching lines @@
       } else if ((instr->RtFieldRaw() != instr->RsFieldRaw())
           && (instr->RsFieldRaw() != 0) && (instr->RtFieldRaw() != 0)) {
         Format(instr, "bltc     'rs, 'rt, 'imm16u");
       } else if ((instr->RsFieldRaw() == 0)
           && (instr->RtFieldRaw() != 0)) {
         Format(instr, "bgtzc    'rt, 'imm16u");
       } else {
         UNREACHABLE();
       }
       break;
-    case BEQZC:
-      if (instr->RsFieldRaw() != 0) {
-        Format(instr, "beqzc   'rs, 'imm21x");
+    case POP66:
+      if (instr->RsValue() == JIC) {
+        Format(instr, "jic     'rt, 'imm16s");
+      } else {
+        Format(instr, "beqzc   'rs, 'imm21s");
       }
       break;
-    case BNEZC:
-      if (instr->RsFieldRaw() != 0) {
+    case POP76:
+      if (instr->RsValue() == JIALC) {
+        Format(instr, "jialc   'rt, 'imm16x");
+      } else {
         Format(instr, "bnezc   'rs, 'imm21x");
       }
       break;
     // ------------- Arithmetic instructions.
     case ADDI:
       if (!IsMipsArchVariant(kMips32r6)) {
         Format(instr, "addi    'rt, 'rs, 'imm16s");
       } else {
         // Check if BOVC or BEQC instruction.
         if (instr->RsFieldRaw() >= instr->RtFieldRaw()) {
@@ skipping 91 matching lines @@
       break;
     case LDC1:
       Format(instr, "ldc1    'ft, 'imm16s('rs)");
       break;
     case SWC1:
       Format(instr, "swc1    'ft, 'imm16s('rs)");
       break;
     case SDC1:
       Format(instr, "sdc1    'ft, 'imm16s('rs)");
       break;
+    case PCREL: {
+      int32_t imm21 = instr->Imm21Value();
+      // rt field: 5-bits checking
+      uint8_t rt = (imm21 >> kImm16Bits);
+      switch (rt) {
+        case ALUIPC:
+          Format(instr, "aluipc  'rs, 'imm16s");
+          break;
+        case AUIPC:
+          UNREACHABLE();
+          break;
+        default: {
+          // rt field: checking of the most significant 2-bits
+          rt = (imm21 >> kImm19Bits);
+          switch (rt) {
+            case LWPC:
+              Format(instr, "lwpc    'rs, 'imm19s");
+              break;
+            case ADDIUPC:
+              Format(instr, "addiupc 'rs, 'imm19s");
+              break;
+            default:
+              UNREACHABLE();
+              break;
+          }
+        }
+      }
+      break;
+    }
     default:
       printf("a 0x%x \n", instr->OpcodeFieldRaw());
       UNREACHABLE();
       break;
   }
 }
 
 
 void Decoder::DecodeTypeJump(Instruction* instr) {
   switch (instr->OpcodeFieldRaw()) {
@@ skipping 114 matching lines @@
         prev_pc, *reinterpret_cast<int32_t*>(prev_pc), buffer.start());
   }
 }
 
 
 #undef UNSUPPORTED
 
 }  // namespace disasm
 
 #endif  // V8_TARGET_ARCH_MIPS