MIPS port initial commit

src/mips/assembler-mips.cc

Index: src/mips/assembler-mips.cc
===================================================================
--- src/mips/assembler-mips.cc	(revision 0)
+++ src/mips/assembler-mips.cc	(revision 0)
@@ -0,0 +1,1208 @@
+// Copyright (c) 1994-2006 Sun Microsystems Inc.
+// 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.
+//
+// - Redistribution 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 Sun Microsystems or the names of 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.
+
+// The original source code covered by the above license above has been
+// modified significantly by Google Inc.
+// Copyright 2010 the V8 project authors. All rights reserved.
+
+
+#include "v8.h"
+#include "mips/assembler-mips-inl.h"
+#include "serialize.h"
+
+
+namespace v8 {
+namespace internal {
+
+
+
+const Register no_reg = { -1 };
+
+const Register zero_reg = { 0 };
+const Register at = { 1 };
+const Register v0 = { 2 };
+const Register v1 = { 3 };
+const Register a0 = { 4 };
+const Register a1 = { 5 };
+const Register a2 = { 6 };
+const Register a3 = { 7 };
+const Register t0 = { 8 };
+const Register t1 = { 9 };
+const Register t2 = { 10 };
+const Register t3 = { 11 };
+const Register t4 = { 12 };
+const Register t5 = { 13 };
+const Register t6 = { 14 };
+const Register t7 = { 15 };
+const Register s0 = { 16 };
+const Register s1 = { 17 };
+const Register s2 = { 18 };
+const Register s3 = { 19 };
+const Register s4 = { 20 };
+const Register s5 = { 21 };
+const Register s6 = { 22 };
+const Register s7 = { 23 };
+const Register t8 = { 24 };
+const Register t9 = { 25 };
+const Register k0 = { 26 };
+const Register k1 = { 27 };
+const Register gp = { 28 };
+const Register sp = { 29 };
+const Register s8_fp = { 30 };
+const Register ra = { 31 };
+
+
+const FPURegister no_creg = { -1 };
+
+const FPURegister f0 = { 0 };
+const FPURegister f1 = { 1 };
+const FPURegister f2 = { 2 };
+const FPURegister f3 = { 3 };
+const FPURegister f4 = { 4 };
+const FPURegister f5 = { 5 };
+const FPURegister f6 = { 6 };
+const FPURegister f7 = { 7 };
+const FPURegister f8 = { 8 };
+const FPURegister f9 = { 9 };
+const FPURegister f10 = { 10 };
+const FPURegister f11 = { 11 };
+const FPURegister f12 = { 12 };
+const FPURegister f13 = { 13 };
+const FPURegister f14 = { 14 };
+const FPURegister f15 = { 15 };
+const FPURegister f16 = { 16 };
+const FPURegister f17 = { 17 };
+const FPURegister f18 = { 18 };
+const FPURegister f19 = { 19 };
+const FPURegister f20 = { 20 };
+const FPURegister f21 = { 21 };
+const FPURegister f22 = { 22 };
+const FPURegister f23 = { 23 };
+const FPURegister f24 = { 24 };
+const FPURegister f25 = { 25 };
+const FPURegister f26 = { 26 };
+const FPURegister f27 = { 27 };
+const FPURegister f28 = { 28 };
+const FPURegister f29 = { 29 };
+const FPURegister f30 = { 30 };
+const FPURegister f31 = { 31 };
+
+int ToNumber(Register reg) {
+  ASSERT(reg.is_valid());
+  const int kNumbers[] = {
+    0,    // zero_reg
+    1,    // at
+    2,    // v0
+    3,    // v1
+    4,    // a0
+    5,    // a1
+    6,    // a2
+    7,    // a3
+    8,    // t0
+    9,    // t1
+    10,   // t2
+    11,   // t3
+    12,   // t4
+    13,   // t5
+    14,   // t6
+    15,   // t7
+    16,   // s0
+    17,   // s1
+    18,   // s2
+    19,   // s3
+    20,   // s4
+    21,   // s5
+    22,   // s6
+    23,   // s7
+    24,   // t8
+    25,   // t9
+    26,   // k0
+    27,   // k1
+    28,   // gp
+    29,   // sp
+    30,   // s8_fp
+    31,   // ra
+  };
+  return kNumbers[reg.code()];
+}
+
+Register ToRegister(int num) {
+  ASSERT(num >= 0 && num < kNumRegisters);
+  const Register kRegisters[] = {
+    zero_reg,
+    at,
+    v0, v1,
+    a0, a1, a2, a3,
+    t0, t1, t2, t3, t4, t5, t6, t7,
+    s0, s1, s2, s3, s4, s5, s6, s7,
+    t8, t9,
+    k0, k1,
+    gp,
+    sp,
+    s8_fp,
+    ra
+  };
+  return kRegisters[num];
+}
+
+
+// -----------------------------------------------------------------------------
+// Implementation of RelocInfo.
+
+const int RelocInfo::kApplyMask = 0;
+
+// Patch the code at the current address with the supplied instructions.
+void RelocInfo::PatchCode(byte* instructions, int instruction_count) {
+  Instr* pc = reinterpret_cast<Instr*>(pc_);
+  Instr* instr = reinterpret_cast<Instr*>(instructions);
+  for (int i = 0; i < instruction_count; i++) {
+    *(pc + i) = *(instr + i);
+  }
+
+  // Indicate that code has changed.
+  CPU::FlushICache(pc_, instruction_count * Assembler::kInstrSize);
+}
+
+
+// Patch the code at the current PC with a call to the target address.
+// Additional guard instructions can be added if required.
+void RelocInfo::PatchCodeWithCall(Address target, int guard_bytes) {
+  // Patch the code at the current address with a call to the target.
+  UNIMPLEMENTED_MIPS();
+}
+
+
+// -----------------------------------------------------------------------------
+// Implementation of Operand and MemOperand.
+// See assembler-mips-inl.h for inlined constructors.
+
+Operand::Operand(Handle<Object> handle) {
+  rm_ = no_reg;
+  // Verify all Objects referred by code are NOT in new space.
+  Object* obj = *handle;
+  ASSERT(!Heap::InNewSpace(obj));
+  if (obj->IsHeapObject()) {
+    imm32_ = reinterpret_cast<intptr_t>(handle.location());
+    rmode_ = RelocInfo::EMBEDDED_OBJECT;
+  } else {
+    // No relocation needed.
+    imm32_ = reinterpret_cast<intptr_t>(obj);
+    rmode_ = RelocInfo::NONE;
+  }
+}
+
+MemOperand::MemOperand(Register rm, int16_t offset) : Operand(rm) {
+  offset_ = offset;
+}
+
+
+// -----------------------------------------------------------------------------
+// Implementation of Assembler.
+
+static const int kMinimalBufferSize = 4*KB;
+static byte* spare_buffer_ = NULL;
+
+Assembler::Assembler(void* buffer, int buffer_size) {
+  if (buffer == NULL) {
+    // Do our own buffer management.
+    if (buffer_size <= kMinimalBufferSize) {
+      buffer_size = kMinimalBufferSize;
+
+      if (spare_buffer_ != NULL) {
+        buffer = spare_buffer_;
+        spare_buffer_ = NULL;
+      }
+    }
+    if (buffer == NULL) {
+      buffer_ = NewArray<byte>(buffer_size);
+    } else {
+      buffer_ = static_cast<byte*>(buffer);
+    }
+    buffer_size_ = buffer_size;
+    own_buffer_ = true;
+
+  } else {
+    // Use externally provided buffer instead.
+    ASSERT(buffer_size > 0);
+    buffer_ = static_cast<byte*>(buffer);
+    buffer_size_ = buffer_size;
+    own_buffer_ = false;
+  }
+
+  // Setup buffer pointers.
+  ASSERT(buffer_ != NULL);
+  pc_ = buffer_;
+  reloc_info_writer.Reposition(buffer_ + buffer_size, pc_);
+  current_statement_position_ = RelocInfo::kNoPosition;
+  current_position_ = RelocInfo::kNoPosition;
+  written_statement_position_ = current_statement_position_;
+  written_position_ = current_position_;
+}
+
+
+Assembler::~Assembler() {
+  if (own_buffer_) {
+    if (spare_buffer_ == NULL && buffer_size_ == kMinimalBufferSize) {
+      spare_buffer_ = buffer_;
+    } else {
+      DeleteArray(buffer_);
+    }
+  }
+}
+
+
+void Assembler::GetCode(CodeDesc* desc) {
+  ASSERT(pc_ <= reloc_info_writer.pos());  // no overlap
+  // Setup code descriptor.
+  desc->buffer = buffer_;
+  desc->buffer_size = buffer_size_;
+  desc->instr_size = pc_offset();
+  desc->reloc_size = (buffer_ + buffer_size_) - reloc_info_writer.pos();
+}
+
+
+// Labels refer to positions in the (to be) generated code.
+// There are bound, linked, and unused labels.
+//
+// Bound labels refer to known positions in the already
+// generated code. pos() is the position the label refers to.
+//
+// Linked labels refer to unknown positions in the code
+// to be generated; pos() is the position of the last
+// instruction using the label.
+
+
+// The link chain is terminated by a negative code position (must be aligned).
+const int kEndOfChain = -4;
+
+bool Assembler::is_branch(Instr instr) {
+  uint32_t opcode   = ((instr & kOpcodeMask));
+  uint32_t rt_field = ((instr & kRtFieldMask));
+  uint32_t rs_field = ((instr & kRsFieldMask));
+  // Checks if the instruction is a branch.
+  return opcode == BEQ ||
+      opcode == BNE ||
+      opcode == BLEZ ||
+      opcode == BGTZ ||
+      opcode == BEQL ||
+      opcode == BNEL ||
+      opcode == BLEZL ||
+      opcode == BGTZL||
+      (opcode == REGIMM && (rt_field == BLTZ || rt_field == BGEZ ||
+                            rt_field == BLTZAL || rt_field == BGEZAL)) ||
+      (opcode == COP1 && rs_field == BC1);  // Coprocessor branch.
+}
+
+
+int Assembler::target_at(int32_t pos) {
+  Instr instr = instr_at(pos);
+  if ((instr & ~kImm16Mask) == 0) {
+    // Emitted label constant, not part of a branch.
+    return instr - (Code::kHeaderSize - kHeapObjectTag);
+  }
+  // Check we have a branch instruction.
+  ASSERT(is_branch(instr));
+  // Do NOT change this to <<2. We rely on arithmetic shifts here, assuming
+  // the compiler uses arithmectic shifts for signed integers.
+  int32_t imm18 = ((instr &
+                    static_cast<int32_t>(kImm16Mask)) << 16) >> 14;
+
+  return pos + kBranchPCOffset + imm18;
+}
+
+
+void Assembler::target_at_put(int32_t pos, int32_t target_pos) {
+  Instr instr = instr_at(pos);
+  if ((instr & ~kImm16Mask) == 0) {
+    ASSERT(target_pos == kEndOfChain || target_pos >= 0);
+    // Emitted label constant, not part of a branch.
+    // Make label relative to Code* of generated Code object.
+    instr_at_put(pos, target_pos + (Code::kHeaderSize - kHeapObjectTag));
+    return;
+  }
+
+  ASSERT(is_branch(instr));
+  int32_t imm18 = target_pos - (pos + kBranchPCOffset);
+  ASSERT((imm18 & 3) == 0);
+
+  instr &= ~kImm16Mask;
+  int32_t imm16 = imm18 >> 2;
+  ASSERT(is_int16(imm16));
+
+  instr_at_put(pos, instr | (imm16 & kImm16Mask));
+}
+
+
+void Assembler::print(Label* L) {
+  if (L->is_unused()) {
+    PrintF("unused label\n");
+  } else if (L->is_bound()) {
+    PrintF("bound label to %d\n", L->pos());
+  } else if (L->is_linked()) {
+    Label l = *L;
+    PrintF("unbound label");
+    while (l.is_linked()) {
+      PrintF("@ %d ", l.pos());
+      Instr instr = instr_at(l.pos());
+      if ((instr & ~kImm16Mask) == 0) {
+        PrintF("value\n");
+      } else {
+        PrintF("%d\n", instr);
+      }
+      next(&l);
+    }
+  } else {
+    PrintF("label in inconsistent state (pos = %d)\n", L->pos_);
+  }
+}
+
+
+void Assembler::bind_to(Label* L, int pos) {
+  ASSERT(0 <= pos && pos <= pc_offset());  // must have a valid binding position
+  while (L->is_linked()) {
+    int32_t fixup_pos = L->pos();
+    next(L);  // call next before overwriting link with target at fixup_pos
+    target_at_put(fixup_pos, pos);
+  }
+  L->bind_to(pos);
+
+  // Keep track of the last bound label so we don't eliminate any instructions
+  // before a bound label.
+  if (pos > last_bound_pos_)
+    last_bound_pos_ = pos;
+}
+
+
+void Assembler::link_to(Label* L, Label* appendix) {
+  if (appendix->is_linked()) {
+    if (L->is_linked()) {
+      // Append appendix to L's list.
+      int fixup_pos;
+      int link = L->pos();
+      do {
+        fixup_pos = link;
+        link = target_at(fixup_pos);
+      } while (link > 0);
+      ASSERT(link == kEndOfChain);
+      target_at_put(fixup_pos, appendix->pos());
+    } else {
+      // L is empty, simply use appendix
+      *L = *appendix;
+    }
+  }
+  appendix->Unuse();  // appendix should not be used anymore
+}
+
+
+void Assembler::bind(Label* L) {
+  ASSERT(!L->is_bound());  // label can only be bound once
+  bind_to(L, pc_offset());
+}
+
+
+void Assembler::next(Label* L) {
+  ASSERT(L->is_linked());
+  int link = target_at(L->pos());
+  if (link > 0) {
+    L->link_to(link);
+  } else {
+    ASSERT(link == kEndOfChain);
+    L->Unuse();
+  }
+}
+
+
+// We have to use a temporary register for things that can be relocated even
+// if they can be encoded in the MIPS's 16 bits of immediate-offset instruction
+// space.  There is no guarantee that the relocated location can be similarly
+// encoded.
+bool Assembler::MustUseAt(RelocInfo::Mode rmode) {
+  if (rmode == RelocInfo::EXTERNAL_REFERENCE) {
+    return Serializer::enabled();
+  } else if (rmode == RelocInfo::NONE) {
+    return false;
+  }
+  return true;
+}
+
+
+void Assembler::GenInstrRegister(Opcode opcode,
+                                 Register rs,
+                                 Register rt,
+                                 Register rd,
+                                 uint16_t sa,
+                                 SecondaryField func) {
+  ASSERT(rd.is_valid() && rs.is_valid() && rt.is_valid() && is_uint5(sa));
+  Instr instr = opcode | (rs.code() << kRsShift) | (rt.code() << kRtShift)
+      | (rd.code() << kRdShift) | (sa << kSaShift) | func;
+  emit(instr);
+}
+
+
+void Assembler::GenInstrRegister(Opcode opcode,
+                                 SecondaryField fmt,
+                                 FPURegister ft,
+                                 FPURegister fs,
+                                 FPURegister fd,
+                                 SecondaryField func) {
+  ASSERT(fd.is_valid() && fs.is_valid() && ft.is_valid());
+  Instr instr = opcode | fmt | (ft.code() << 16) | (fs.code() << kFsShift)
+      | (fd.code() << 6) | func;
+  emit(instr);
+}
+
+
+void Assembler::GenInstrRegister(Opcode opcode,
+                                 SecondaryField fmt,
+                                 Register rt,
+                                 FPURegister fs,
+                                 FPURegister fd,
+                                 SecondaryField func) {
+  ASSERT(fd.is_valid() && fs.is_valid() && rt.is_valid());
+  Instr instr = opcode | fmt | (rt.code() << kRtShift)
+      | (fs.code() << kFsShift) | (fd.code() << 6) | func;
+  emit(instr);
+}
+
+
+// Instructions with immediate value.
+// Registers are in the order of the instruction encoding, from left to right.
+void Assembler::GenInstrImmediate(Opcode opcode,
+                                  Register rs,
+                                  Register rt,
+                                  int32_t j) {
+  ASSERT(rs.is_valid() && rt.is_valid() && (is_int16(j) || is_uint16(j)));
+  Instr instr = opcode | (rs.code() << kRsShift) | (rt.code() << kRtShift)
+      | (j & kImm16Mask);
+  emit(instr);
+}
+
+
+void Assembler::GenInstrImmediate(Opcode opcode,
+                                  Register rs,
+                                  SecondaryField SF,
+                                  int32_t j) {
+  ASSERT(rs.is_valid() && (is_int16(j) || is_uint16(j)));
+  Instr instr = opcode | (rs.code() << kRsShift) | SF | (j & kImm16Mask);
+  emit(instr);
+}
+
+
+void Assembler::GenInstrImmediate(Opcode opcode,
+                                  Register rs,
+                                  FPURegister ft,
+                                  int32_t j) {
+  ASSERT(rs.is_valid() && ft.is_valid() && (is_int16(j) || is_uint16(j)));
+  Instr instr = opcode | (rs.code() << kRsShift) | (ft.code() << kFtShift)
+      | (j & kImm16Mask);
+  emit(instr);
+}
+
+
+// Registers are in the order of the instruction encoding, from left to right.
+void Assembler::GenInstrJump(Opcode opcode,
+                              uint32_t address) {
+  ASSERT(is_uint26(address));
+  Instr instr = opcode | address;
+  emit(instr);
+}
+
+
+int32_t Assembler::branch_offset(Label* L, bool jump_elimination_allowed) {
+  int32_t target_pos;
+  if (L->is_bound()) {
+    target_pos = L->pos();
+  } else {
+    if (L->is_linked()) {
+      target_pos = L->pos();  // L's link
+    } else {
+      target_pos = kEndOfChain;
+    }
+    L->link_to(pc_offset());
+  }
+
+  int32_t offset = target_pos - (pc_offset() + kBranchPCOffset);
+  return offset;
+}
+
+
+void Assembler::label_at_put(Label* L, int at_offset) {
+  int target_pos;
+  if (L->is_bound()) {
+    target_pos = L->pos();
+  } else {
+    if (L->is_linked()) {
+      target_pos = L->pos();  // L's link
+    } else {
+      target_pos = kEndOfChain;
+    }
+    L->link_to(at_offset);
+    instr_at_put(at_offset, target_pos + (Code::kHeaderSize - kHeapObjectTag));
+  }
+}
+
+
+//------- Branch and jump instructions --------
+
+void Assembler::b(int16_t offset) {
+  beq(zero_reg, zero_reg, offset);
+}
+
+
+void Assembler::bal(int16_t offset) {
+  bgezal(zero_reg, offset);
+}
+
+
+void Assembler::beq(Register rs, Register rt, int16_t offset) {
+  GenInstrImmediate(BEQ, rs, rt, offset);
+}
+
+
+void Assembler::bgez(Register rs, int16_t offset) {
+  GenInstrImmediate(REGIMM, rs, BGEZ, offset);
+}
+
+
+void Assembler::bgezal(Register rs, int16_t offset) {
+  GenInstrImmediate(REGIMM, rs, BGEZAL, offset);
+}
+
+
+void Assembler::bgtz(Register rs, int16_t offset) {
+  GenInstrImmediate(BGTZ, rs, zero_reg, offset);
+}
+
+
+void Assembler::blez(Register rs, int16_t offset) {
+  GenInstrImmediate(BLEZ, rs, zero_reg, offset);
+}
+
+
+void Assembler::bltz(Register rs, int16_t offset) {
+  GenInstrImmediate(REGIMM, rs, BLTZ, offset);
+}
+
+
+void Assembler::bltzal(Register rs, int16_t offset) {
+  GenInstrImmediate(REGIMM, rs, BLTZAL, offset);
+}
+
+
+void Assembler::bne(Register rs, Register rt, int16_t offset) {
+  GenInstrImmediate(BNE, rs, rt, offset);
+}
+
+
+void Assembler::j(int32_t target) {
+  ASSERT(is_uint28(target) && ((target & 3) == 0));
+  GenInstrJump(J, target >> 2);
+}
+
+
+void Assembler::jr(Register rs) {
+  GenInstrRegister(SPECIAL, rs, zero_reg, zero_reg, 0, JR);
+}
+
+
+void Assembler::jal(int32_t target) {
+  ASSERT(is_uint28(target) && ((target & 3) == 0));
+  GenInstrJump(JAL, target >> 2);
+}
+
+
+void Assembler::jalr(Register rs, Register rd) {
+  GenInstrRegister(SPECIAL, rs, zero_reg, rd, 0, JALR);
+}
+
+
+//-------Data-processing-instructions---------
+
+// Arithmetic.
+
+void Assembler::add(Register rd, Register rs, Register rt) {
+  GenInstrRegister(SPECIAL, rs, rt, rd, 0, ADD);
+}
+
+
+void Assembler::addu(Register rd, Register rs, Register rt) {
+  GenInstrRegister(SPECIAL, rs, rt, rd, 0, ADDU);
+}
+
+
+void Assembler::addi(Register rd, Register rs, int32_t j) {
+  GenInstrImmediate(ADDI, rs, rd, j);
+}
+
+
+void Assembler::addiu(Register rd, Register rs, int32_t j) {
+  GenInstrImmediate(ADDIU, rs, rd, j);
+}
+
+
+void Assembler::sub(Register rd, Register rs, Register rt) {
+  GenInstrRegister(SPECIAL, rs, rt, rd, 0, SUB);
+}
+
+
+void Assembler::subu(Register rd, Register rs, Register rt) {
+  GenInstrRegister(SPECIAL, rs, rt, rd, 0, SUBU);
+}
+
+
+void Assembler::mul(Register rd, Register rs, Register rt) {
+  GenInstrRegister(SPECIAL2, rs, rt, rd, 0, MUL);
+}
+
+
+void Assembler::mult(Register rs, Register rt) {
+  GenInstrRegister(SPECIAL, rs, rt, zero_reg, 0, MULT);
+}
+
+
+void Assembler::multu(Register rs, Register rt) {
+  GenInstrRegister(SPECIAL, rs, rt, zero_reg, 0, MULTU);
+}
+
+
+void Assembler::div(Register rs, Register rt) {
+  GenInstrRegister(SPECIAL, rs, rt, zero_reg, 0, DIV);
+}
+
+
+void Assembler::divu(Register rs, Register rt) {
+  GenInstrRegister(SPECIAL, rs, rt, zero_reg, 0, DIVU);
+}
+
+
+// Logical.
+
+void Assembler::and_(Register rd, Register rs, Register rt) {
+  GenInstrRegister(SPECIAL, rs, rt, rd, 0, AND);
+}
+
+
+void Assembler::andi(Register rt, Register rs, int32_t j) {
+  GenInstrImmediate(ANDI, rs, rt, j);
+}
+
+
+void Assembler::or_(Register rd, Register rs, Register rt) {
+  GenInstrRegister(SPECIAL, rs, rt, rd, 0, OR);
+}
+
+
+void Assembler::ori(Register rt, Register rs, int32_t j) {
+  GenInstrImmediate(ORI, rs, rt, j);
+}
+
+
+void Assembler::xor_(Register rd, Register rs, Register rt) {
+  GenInstrRegister(SPECIAL, rs, rt, rd, 0, XOR);
+}
+
+
+void Assembler::xori(Register rt, Register rs, int32_t j) {
+  GenInstrImmediate(XORI, rs, rt, j);
+}
+
+
+void Assembler::nor(Register rd, Register rs, Register rt) {
+  GenInstrRegister(SPECIAL, rs, rt, rd, 0, NOR);
+}
+
+
+// Shifts.
+void Assembler::sll(Register rd, Register rt, uint16_t sa) {
+  GenInstrRegister(SPECIAL, zero_reg, rt, rd, sa, SLL);
+}
+
+
+void Assembler::sllv(Register rd, Register rt, Register rs) {
+  GenInstrRegister(SPECIAL, rs, rt, rd, 0, SLLV);
+}
+
+
+void Assembler::srl(Register rd, Register rt, uint16_t sa) {
+  GenInstrRegister(SPECIAL, zero_reg, rt, rd, sa, SRL);
+}
+
+
+void Assembler::srlv(Register rd, Register rt, Register rs) {
+  GenInstrRegister(SPECIAL, rs, rt, rd, 0, SRLV);
+}
+
+
+void Assembler::sra(Register rd, Register rt, uint16_t sa) {
+  GenInstrRegister(SPECIAL, zero_reg, rt, rd, sa, SRA);
+}
+
+
+void Assembler::srav(Register rd, Register rt, Register rs) {
+  GenInstrRegister(SPECIAL, rs, rt, rd, 0, SRAV);
+}
+
+
+//------------Memory-instructions-------------
+
+void Assembler::lb(Register rd, const MemOperand& rs) {
+  GenInstrImmediate(LB, rs.rm(), rd, rs.offset_);
+}
+
+
+void Assembler::lbu(Register rd, const MemOperand& rs) {
+  GenInstrImmediate(LBU, rs.rm(), rd, rs.offset_);
+}
+
+
+void Assembler::lw(Register rd, const MemOperand& rs) {
+  GenInstrImmediate(LW, rs.rm(), rd, rs.offset_);
+}
+
+
+void Assembler::sb(Register rd, const MemOperand& rs) {
+  GenInstrImmediate(SB, rs.rm(), rd, rs.offset_);
+}
+
+
+void Assembler::sw(Register rd, const MemOperand& rs) {
+  GenInstrImmediate(SW, rs.rm(), rd, rs.offset_);
+}
+
+
+void Assembler::lui(Register rd, int32_t j) {
+  GenInstrImmediate(LUI, zero_reg, rd, j);
+}
+
+
+//-------------Misc-instructions--------------
+
+// Break / Trap instructions.
+void Assembler::break_(uint32_t code) {
+  ASSERT((code & ~0xfffff) == 0);
+  Instr break_instr = SPECIAL | BREAK | (code << 6);
+  emit(break_instr);
+}
+
+
+void Assembler::tge(Register rs, Register rt, uint16_t code) {
+  ASSERT(is_uint10(code));
+  Instr instr = SPECIAL | TGE | rs.code() << kRsShift
+      | rt.code() << kRtShift | code << 6;
+  emit(instr);
+}
+
+
+void Assembler::tgeu(Register rs, Register rt, uint16_t code) {
+  ASSERT(is_uint10(code));
+  Instr instr = SPECIAL | TGEU | rs.code() << kRsShift
+      | rt.code() << kRtShift | code << 6;
+  emit(instr);
+}
+
+
+void Assembler::tlt(Register rs, Register rt, uint16_t code) {
+  ASSERT(is_uint10(code));
+  Instr instr =
+      SPECIAL | TLT | rs.code() << kRsShift | rt.code() << kRtShift | code << 6;
+  emit(instr);
+}
+
+
+void Assembler::tltu(Register rs, Register rt, uint16_t code) {
+  ASSERT(is_uint10(code));
+  Instr instr = SPECIAL | TLTU | rs.code() << kRsShift
+      | rt.code() << kRtShift | code << 6;
+  emit(instr);
+}
+
+
+void Assembler::teq(Register rs, Register rt, uint16_t code) {
+  ASSERT(is_uint10(code));
+  Instr instr =
+      SPECIAL | TEQ | rs.code() << kRsShift | rt.code() << kRtShift | code << 6;
+  emit(instr);
+}
+
+
+void Assembler::tne(Register rs, Register rt, uint16_t code) {
+  ASSERT(is_uint10(code));
+  Instr instr =
+      SPECIAL | TNE | rs.code() << kRsShift | rt.code() << kRtShift | code << 6;
+  emit(instr);
+}
+
+
+// Move from HI/LO register.
+
+void Assembler::mfhi(Register rd) {
+  GenInstrRegister(SPECIAL, zero_reg, zero_reg, rd, 0, MFHI);
+}
+
+
+void Assembler::mflo(Register rd) {
+  GenInstrRegister(SPECIAL, zero_reg, zero_reg, rd, 0, MFLO);
+}
+
+
+// Set on less than instructions.
+void Assembler::slt(Register rd, Register rs, Register rt) {
+  GenInstrRegister(SPECIAL, rs, rt, rd, 0, SLT);
+}
+
+
+void Assembler::sltu(Register rd, Register rs, Register rt) {
+  GenInstrRegister(SPECIAL, rs, rt, rd, 0, SLTU);
+}
+
+
+void Assembler::slti(Register rt, Register rs, int32_t j) {
+  GenInstrImmediate(SLTI, rs, rt, j);
+}
+
+
+void Assembler::sltiu(Register rt, Register rs, int32_t j) {
+  GenInstrImmediate(SLTIU, rs, rt, j);
+}
+
+
+//--------Coprocessor-instructions----------------
+
+// Load, store, move.
+void Assembler::lwc1(FPURegister fd, const MemOperand& src) {
+  GenInstrImmediate(LWC1, src.rm(), fd, src.offset_);
+}
+
+
+void Assembler::ldc1(FPURegister fd, const MemOperand& src) {
+  GenInstrImmediate(LDC1, src.rm(), fd, src.offset_);
+}
+
+
+void Assembler::swc1(FPURegister fd, const MemOperand& src) {
+  GenInstrImmediate(SWC1, src.rm(), fd, src.offset_);
+}
+
+
+void Assembler::sdc1(FPURegister fd, const MemOperand& src) {
+  GenInstrImmediate(SDC1, src.rm(), fd, src.offset_);
+}
+
+
+void Assembler::mtc1(FPURegister fs, Register rt) {
+  GenInstrRegister(COP1, MTC1, rt, fs, f0);
+}
+
+
+void Assembler::mthc1(FPURegister fs, Register rt) {
+  GenInstrRegister(COP1, MTHC1, rt, fs, f0);
+}
+
+
+void Assembler::mfc1(FPURegister fs, Register rt) {
+  GenInstrRegister(COP1, MFC1, rt, fs, f0);
+}
+
+
+void Assembler::mfhc1(FPURegister fs, Register rt) {
+  GenInstrRegister(COP1, MFHC1, rt, fs, f0);
+}
+
+
+// Conversions.
+
+void Assembler::cvt_w_s(FPURegister fd, FPURegister fs) {
+  GenInstrRegister(COP1, S, f0, fs, fd, CVT_W_S);
+}
+
+
+void Assembler::cvt_w_d(FPURegister fd, FPURegister fs) {
+  GenInstrRegister(COP1, D, f0, fs, fd, CVT_W_D);
+}
+
+
+void Assembler::cvt_l_s(FPURegister fd, FPURegister fs) {
+  GenInstrRegister(COP1, S, f0, fs, fd, CVT_L_S);
+}
+
+
+void Assembler::cvt_l_d(FPURegister fd, FPURegister fs) {
+  GenInstrRegister(COP1, D, f0, fs, fd, CVT_L_D);
+}
+
+
+void Assembler::cvt_s_w(FPURegister fd, FPURegister fs) {
+  GenInstrRegister(COP1, W, f0, fs, fd, CVT_S_W);
+}
+
+
+void Assembler::cvt_s_l(FPURegister fd, FPURegister fs) {
+  GenInstrRegister(COP1, L, f0, fs, fd, CVT_S_L);
+}
+
+
+void Assembler::cvt_s_d(FPURegister fd, FPURegister fs) {
+  GenInstrRegister(COP1, D, f0, fs, fd, CVT_S_D);
+}
+
+
+void Assembler::cvt_d_w(FPURegister fd, FPURegister fs) {
+  GenInstrRegister(COP1, W, f0, fs, fd, CVT_D_W);
+}
+
+
+void Assembler::cvt_d_l(FPURegister fd, FPURegister fs) {
+  GenInstrRegister(COP1, L, f0, fs, fd, CVT_D_L);
+}
+
+
+void Assembler::cvt_d_s(FPURegister fd, FPURegister fs) {
+  GenInstrRegister(COP1, S, f0, fs, fd, CVT_D_S);
+}
+
+
+// Conditions.
+void Assembler::c(FPUCondition cond, SecondaryField fmt,
+    FPURegister ft, FPURegister fs, uint16_t cc) {
+  ASSERT(is_uint3(cc));
+  ASSERT((fmt & ~(31 << kRsShift)) == 0);
+  Instr instr = COP1 | fmt | ft.code() << 16 | fs.code() << kFsShift
+      | cc << 8 | 3 << 4 | cond;
+  emit(instr);
+}
+
+
+void Assembler::bc1f(int16_t offset, uint16_t cc) {
+  ASSERT(is_uint3(cc));
+  Instr instr = COP1 | BC1 | cc << 18 | 0 << 16 | (offset & kImm16Mask);
+  emit(instr);
+}
+
+
+void Assembler::bc1t(int16_t offset, uint16_t cc) {
+  ASSERT(is_uint3(cc));
+  Instr instr = COP1 | BC1 | cc << 18 | 1 << 16 | (offset & kImm16Mask);
+  emit(instr);
+}
+
+
+// Debugging.
+void Assembler::RecordJSReturn() {
+  WriteRecordedPositions();
+  CheckBuffer();
+  RecordRelocInfo(RelocInfo::JS_RETURN);
+}
+
+
+void Assembler::RecordComment(const char* msg) {
+  if (FLAG_debug_code) {
+    CheckBuffer();
+    RecordRelocInfo(RelocInfo::COMMENT, reinterpret_cast<intptr_t>(msg));
+  }
+}
+
+
+void Assembler::RecordPosition(int pos) {
+  if (pos == RelocInfo::kNoPosition) return;
+  ASSERT(pos >= 0);
+  current_position_ = pos;
+}
+
+
+void Assembler::RecordStatementPosition(int pos) {
+  if (pos == RelocInfo::kNoPosition) return;
+  ASSERT(pos >= 0);
+  current_statement_position_ = pos;
+}
+
+
+void Assembler::WriteRecordedPositions() {
+  // Write the statement position if it is different from what was written last
+  // time.
+  if (current_statement_position_ != written_statement_position_) {
+    CheckBuffer();
+    RecordRelocInfo(RelocInfo::STATEMENT_POSITION, current_statement_position_);
+    written_statement_position_ = current_statement_position_;
+  }
+
+  // Write the position if it is different from what was written last time and
+  // also different from the written statement position.
+  if (current_position_ != written_position_ &&
+      current_position_ != written_statement_position_) {
+    CheckBuffer();
+    RecordRelocInfo(RelocInfo::POSITION, current_position_);
+    written_position_ = current_position_;
+  }
+}
+
+
+void Assembler::GrowBuffer() {
+  if (!own_buffer_) FATAL("external code buffer is too small");
+
+  // Compute new buffer size.
+  CodeDesc desc;  // the new buffer
+  if (buffer_size_ < 4*KB) {
+    desc.buffer_size = 4*KB;
+  } else if (buffer_size_ < 1*MB) {
+    desc.buffer_size = 2*buffer_size_;
+  } else {
+    desc.buffer_size = buffer_size_ + 1*MB;
+  }
+  CHECK_GT(desc.buffer_size, 0);  // no overflow
+
+  // Setup new buffer.
+  desc.buffer = NewArray<byte>(desc.buffer_size);
+
+  desc.instr_size = pc_offset();
+  desc.reloc_size = (buffer_ + buffer_size_) - reloc_info_writer.pos();
+
+  // Copy the data.
+  int pc_delta = desc.buffer - buffer_;
+  int rc_delta = (desc.buffer + desc.buffer_size) - (buffer_ + buffer_size_);
+  memmove(desc.buffer, buffer_, desc.instr_size);
+  memmove(reloc_info_writer.pos() + rc_delta,
+          reloc_info_writer.pos(), desc.reloc_size);
+
+  // Switch buffers.
+  DeleteArray(buffer_);
+  buffer_ = desc.buffer;
+  buffer_size_ = desc.buffer_size;
+  pc_ += pc_delta;
+  reloc_info_writer.Reposition(reloc_info_writer.pos() + rc_delta,
+                               reloc_info_writer.last_pc() + pc_delta);
+
+
+  // On ia32 and ARM pc relative addressing is used, and we thus need to apply a
+  // shift by pc_delta. But on MIPS the target address it directly loaded, so
+  // we do not need to relocate here.
+
+  ASSERT(!overflow());
+}
+
+
+void Assembler::RecordRelocInfo(RelocInfo::Mode rmode, intptr_t data) {
+  RelocInfo rinfo(pc_, rmode, data);  // we do not try to reuse pool constants
+  if (rmode >= RelocInfo::JS_RETURN && rmode <= RelocInfo::STATEMENT_POSITION) {
+    // Adjust code for new modes.
+    ASSERT(RelocInfo::IsJSReturn(rmode)
+           || RelocInfo::IsComment(rmode)
+           || RelocInfo::IsPosition(rmode));
+    // These modes do not need an entry in the constant pool.
+  }
+  if (rinfo.rmode() != RelocInfo::NONE) {
+    // Don't record external references unless the heap will be serialized.
+    if (rmode == RelocInfo::EXTERNAL_REFERENCE &&
+        !Serializer::enabled() &&
+        !FLAG_debug_code) {
+      return;
+    }
+    ASSERT(buffer_space() >= kMaxRelocSize);  // too late to grow buffer here
+    reloc_info_writer.Write(&rinfo);
+  }
+}
+
+
+Address Assembler::target_address_at(Address pc) {
+  Instr instr1 = instr_at(pc);
+  Instr instr2 = instr_at(pc + kInstrSize);
+  // Check we have 2 instructions generated by li.
+  ASSERT(((instr1 & kOpcodeMask) == LUI && (instr2 & kOpcodeMask) == ORI) ||
+         ((instr1 == nopInstr) && ((instr2 & kOpcodeMask) == ADDI ||
+                            (instr2 & kOpcodeMask) == ORI ||
+                            (instr2 & kOpcodeMask) == LUI)));
+  // Interpret these 2 instructions.
+  if (instr1 == nopInstr) {
+    if ((instr2 & kOpcodeMask) == ADDI) {
+      return reinterpret_cast<Address>(((instr2 & kImm16Mask) << 16) >> 16);
+    } else if ((instr2 & kOpcodeMask) == ORI) {
+      return reinterpret_cast<Address>(instr2 & kImm16Mask);
+    } else if ((instr2 & kOpcodeMask) == LUI) {
+      return reinterpret_cast<Address>((instr2 & kImm16Mask) << 16);
+    }
+  } else if ((instr1 & kOpcodeMask) == LUI && (instr2 & kOpcodeMask) == ORI) {
+    // 32 bits value.
+    return reinterpret_cast<Address>(
+        (instr1 & kImm16Mask) << 16 | (instr2 & kImm16Mask));
+  }
+
+  // We should never get here.
+  UNREACHABLE();
+  return (Address)0x0;
+}
+
+
+void Assembler::set_target_address_at(Address pc, Address target) {
+  // On MIPS we need to patch the code to generate.
+
+  // First check we have a li.
+  Instr instr2 = instr_at(pc + kInstrSize);
+#ifdef DEBUG
+  Instr instr1 = instr_at(pc);
+
+  // Check we have indeed the result from a li with MustUseAt true.
+  CHECK(((instr1 & kOpcodeMask) == LUI && (instr2 & kOpcodeMask) == ORI) ||
+        ((instr1 == 0) && ((instr2 & kOpcodeMask)== ADDIU ||
+                           (instr2 & kOpcodeMask)== ORI ||
+                           (instr2 & kOpcodeMask)== LUI)));
+#endif
+
+
+  uint32_t rt_code = (instr2 & kRtFieldMask);
+  uint32_t* p = reinterpret_cast<uint32_t*>(pc);
+  uint32_t itarget = reinterpret_cast<uint32_t>(target);
+
+  if (is_int16(itarget)) {
+    // nop
+    // addiu rt zero_reg j
+    *p = nopInstr;
+    *(p+1) = ADDIU | rt_code | (itarget & LOMask);
+  } else if (!(itarget & HIMask)) {
+    // nop
+    // ori rt zero_reg j
+    *p = nopInstr;
+    *(p+1) = ORI | rt_code | (itarget & LOMask);
+  } else if (!(itarget & LOMask)) {
+    // nop
+    // lui rt (HIMask & itarget)>>16
+    *p = nopInstr;
+    *(p+1) = LUI | rt_code | ((itarget & HIMask)>>16);
+  } else {
+    // lui rt (HIMask & itarget)>>16
+    // ori rt rt, (LOMask & itarget)
+    *p = LUI | rt_code | ((itarget & HIMask)>>16);
+    *(p+1) = ORI | rt_code | (rt_code << 5) | (itarget & LOMask);
+  }
+
+  CPU::FlushICache(pc, 2 * sizeof(int32_t));
+}
+
+
+} }  // namespace v8::internal
+