Move backend specific files to separate directories.

src/arm/constants-arm.h

+// Copyright 2008 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
+//       with the distribution.
+//     * Neither the name of Google Inc. nor the names of its
+//       contributors may be used to endorse or promote products derived
+//       from this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+#ifndef V8_CONSTANTS_ARM_H_
+#define V8_CONSTANTS_ARM_H_
+
+namespace assembler { namespace arm {
+
+// Defines constants and accessor classes to assemble, disassemble and
+// simulate ARM instructions.
+//
+// Section references in the code refer to the "ARM Architecture Reference
+// Manual" from July 2005 (available at http://www.arm.com/miscPDFs/14128.pdf)
+//
+// Constants for specific fields are defined in their respective named enums.
+// General constants are in an anonymous enum in class Instr.
+
+typedef unsigned char byte;
+
+// Values for the condition field as defined in section A3.2
+enum Condition {
+  no_condition = -1,
+  EQ =  0,  // equal
+  NE =  1,  // not equal
+  CS =  2,  // carry set/unsigned higher or same
+  CC =  3,  // carry clear/unsigned lower
+  MI =  4,  // minus/negative
+  PL =  5,  // plus/positive or zero
+  VS =  6,  // overflow
+  VC =  7,  // no overflow
+  HI =  8,  // unsigned higher
+  LS =  9,  // unsigned lower or same
+  GE = 10,  // signed greater than or equal
+  LT = 11,  // signed less than
+  GT = 12,  // signed greater than
+  LE = 13,  // signed less than or equal
+  AL = 14,  // always (unconditional)
+  special_condition = 15,  // special condition (refer to section A3.2.1)
+  max_condition = 16
+};
+
+
+// Opcodes for Data-processing instructions (instructions with a type 0 and 1)
+// as defined in section A3.4
+enum Opcode {
+  no_operand = -1,
+  AND =  0,  // Logical AND
+  EOR =  1,  // Logical Exclusive OR
+  SUB =  2,  // Subtract
+  RSB =  3,  // Reverse Subtract
+  ADD =  4,  // Add
+  ADC =  5,  // Add with Carry
+  SBC =  6,  // Subtract with Carry
+  RSC =  7,  // Reverse Subtract with Carry
+  TST =  8,  // Test
+  TEQ =  9,  // Test Equivalence
+  CMP = 10,  // Compare
+  CMN = 11,  // Compare Negated
+  ORR = 12,  // Logical (inclusive) OR
+  MOV = 13,  // Move
+  BIC = 14,  // Bit Clear
+  MVN = 15,  // Move Not
+  max_operand = 16
+};
+
+
+// Shifter types for Data-processing operands as defined in section A5.1.2.
+enum Shift {
+  no_shift = -1,
+  LSL = 0,  // Logical shift left
+  LSR = 1,  // Logical shift right
+  ASR = 2,  // Arithmetic shift right
+  ROR = 3,  // Rotate right
+  max_shift = 4
+};
+
+
+// Special Software Interrupt codes when used in the presence of the ARM
+// simulator.
+enum SoftwareInterruptCodes {
+  // transition to C code
+  call_rt_r5 = 0x10,
+  call_rt_r2 = 0x11,
+  // break point
+  break_point = 0x20,
+  // FP operations.  These simulate calling into C for a moment to do fp ops.
+  // They should trash all caller-save registers.
+  simulator_fp_add = 0x21,
+  simulator_fp_sub = 0x22,
+  simulator_fp_mul = 0x23
+};
+
+
+typedef int32_t instr_t;
+
+
+// The class Instr enables access to individual fields defined in the ARM
+// architecture instruction set encoding as described in figure A3-1.
+//
+// Example: Test whether the instruction at ptr does set the condition code
+// bits.
+//
+// bool InstructionSetsConditionCodes(byte* ptr) {
+//   Instr* instr = Instr::At(ptr);
+//   int type = instr->TypeField();
+//   return ((type == 0) || (type == 1)) && instr->HasS();
+// }
+//
+class Instr {
+ public:
+  enum {
+    kInstrSize = 4,
+    kInstrSizeLog2 = 2,
+    kPCReadOffset = 8
+  };
+
+  // Get the raw instruction bits.
+  inline instr_t InstructionBits() const {
+    return *reinterpret_cast<const instr_t*>(this);
+  }
+
+  // Set the raw instruction bits to value.
+  inline void SetInstructionBits(instr_t value) {
+    *reinterpret_cast<instr_t*>(this) = value;
+  }
+
+  // Read one particular bit out of the instruction bits.
+  inline int Bit(int nr) const {
+    return (InstructionBits() >> nr) & 1;
+  }
+
+  // Read a bit field out of the instruction bits.
+  inline int Bits(int hi, int lo) const {
+    return (InstructionBits() >> lo) & ((2 << (hi - lo)) - 1);
+  }
+
+
+  // Accessors for the different named fields used in the ARM encoding.
+  // The naming of these accessor corresponds to figure A3-1.
+  // Generally applicable fields
+  inline Condition ConditionField() const {
+    return static_cast<Condition>(Bits(31, 28));
+  }
+  inline int TypeField() const { return Bits(27, 25); }
+
+  inline int RnField() const { return Bits(19, 16); }
+  inline int RdField() const { return Bits(15, 12); }
+
+  // Fields used in Data processing instructions
+  inline Opcode OpcodeField() const {
+    return static_cast<Opcode>(Bits(24, 21));
+  }
+  inline int SField() const { return Bit(20); }
+    // with register
+  inline int RmField() const { return Bits(3, 0); }
+  inline Shift ShiftField() const { return static_cast<Shift>(Bits(6, 5)); }
+  inline int RegShiftField() const { return Bit(4); }
+  inline int RsField() const { return Bits(11, 8); }
+  inline int ShiftAmountField() const { return Bits(11, 7); }
+    // with immediate
+  inline int RotateField() const { return Bits(11, 8); }
+  inline int Immed8Field() const { return Bits(7, 0); }
+
+  // Fields used in Load/Store instructions
+  inline int PUField() const { return Bits(24, 23); }
+  inline int  BField() const { return Bit(22); }
+  inline int  WField() const { return Bit(21); }
+  inline int  LField() const { return Bit(20); }
+    // with register uses same fields as Data processing instructions above
+    // with immediate
+  inline int Offset12Field() const { return Bits(11, 0); }
+    // multiple
+  inline int RlistField() const { return Bits(15, 0); }
+    // extra loads and stores
+  inline int SignField() const { return Bit(6); }
+  inline int HField() const { return Bit(5); }
+  inline int ImmedHField() const { return Bits(11, 8); }
+  inline int ImmedLField() const { return Bits(3, 0); }
+
+  // Fields used in Branch instructions
+  inline int LinkField() const { return Bit(24); }
+  inline int SImmed24Field() const { return ((InstructionBits() << 8) >> 8); }
+
+  // Fields used in Software interrupt instructions
+  inline SoftwareInterruptCodes SwiField() const {
+    return static_cast<SoftwareInterruptCodes>(Bits(23, 0));
+  }
+
+  // Test for special encodings of type 0 instructions (extra loads and stores,
+  // as well as multiplications).
+  inline bool IsSpecialType0() const { return (Bit(7) == 1) && (Bit(4) == 1); }
+
+  // Special accessors that test for existence of a value.
+  inline bool HasS()    const { return SField() == 1; }
+  inline bool HasB()    const { return BField() == 1; }
+  inline bool HasW()    const { return WField() == 1; }
+  inline bool HasL()    const { return LField() == 1; }
+  inline bool HasSign() const { return SignField() == 1; }
+  inline bool HasH()    const { return HField() == 1; }
+  inline bool HasLink() const { return LinkField() == 1; }
+
+  // Instructions are read of out a code stream. The only way to get a
+  // reference to an instruction is to convert a pointer. There is no way
+  // to allocate or create instances of class Instr.
+  // Use the At(pc) function to create references to Instr.
+  static Instr* At(byte* pc) { return reinterpret_cast<Instr*>(pc); }
+
+ private:
+  // We need to prevent the creation of instances of class Instr.
+  DISALLOW_IMPLICIT_CONSTRUCTORS(Instr);
+};
+
+
+} }  // namespace assembler::arm
+
+#endif  // V8_CONSTANTS_ARM_H_