Version 2.2.11...

src/arm/assembler-thumb2-inl.h

-// 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 2006-2008 the V8 project authors. All rights reserved.
-
-#ifndef V8_ARM_ASSEMBLER_THUMB2_INL_H_
-#define V8_ARM_ASSEMBLER_THUMB2_INL_H_
-
-#include "arm/assembler-thumb2.h"
-#include "cpu.h"
-
-
-namespace v8 {
-namespace internal {
-
-Condition NegateCondition(Condition cc) {
-  ASSERT(cc != al);
-  return static_cast<Condition>(cc ^ ne);
-}
-
-
-void RelocInfo::apply(intptr_t delta) {
-  if (RelocInfo::IsInternalReference(rmode_)) {
-    // absolute code pointer inside code object moves with the code object.
-    int32_t* p = reinterpret_cast<int32_t*>(pc_);
-    *p += delta;  // relocate entry
-  }
-  // We do not use pc relative addressing on ARM, so there is
-  // nothing else to do.
-}
-
-
-Address RelocInfo::target_address() {
-  ASSERT(IsCodeTarget(rmode_) || rmode_ == RUNTIME_ENTRY);
-  return Assembler::target_address_at(pc_);
-}
-
-
-Address RelocInfo::target_address_address() {
-  ASSERT(IsCodeTarget(rmode_) || rmode_ == RUNTIME_ENTRY);
-  return reinterpret_cast<Address>(Assembler::target_address_address_at(pc_));
-}
-
-
-void RelocInfo::set_target_address(Address target) {
-  ASSERT(IsCodeTarget(rmode_) || rmode_ == RUNTIME_ENTRY);
-  Assembler::set_target_address_at(pc_, target);
-}
-
-
-Object* RelocInfo::target_object() {
-  ASSERT(IsCodeTarget(rmode_) || rmode_ == EMBEDDED_OBJECT);
-  return Memory::Object_at(Assembler::target_address_address_at(pc_));
-}
-
-
-Handle<Object> RelocInfo::target_object_handle(Assembler* origin) {
-  ASSERT(IsCodeTarget(rmode_) || rmode_ == EMBEDDED_OBJECT);
-  return Memory::Object_Handle_at(Assembler::target_address_address_at(pc_));
-}
-
-
-Object** RelocInfo::target_object_address() {
-  ASSERT(IsCodeTarget(rmode_) || rmode_ == EMBEDDED_OBJECT);
-  return reinterpret_cast<Object**>(Assembler::target_address_address_at(pc_));
-}
-
-
-void RelocInfo::set_target_object(Object* target) {
-  ASSERT(IsCodeTarget(rmode_) || rmode_ == EMBEDDED_OBJECT);
-  Assembler::set_target_address_at(pc_, reinterpret_cast<Address>(target));
-}
-
-
-Address* RelocInfo::target_reference_address() {
-  ASSERT(rmode_ == EXTERNAL_REFERENCE);
-  return reinterpret_cast<Address*>(Assembler::target_address_address_at(pc_));
-}
-
-
-Address RelocInfo::call_address() {
-  ASSERT(IsPatchedReturnSequence());
-  // The 2 instructions offset assumes patched return sequence.
-  ASSERT(IsJSReturn(rmode()));
-  return Memory::Address_at(pc_ + 2 * Assembler::kInstrSize);
-}
-
-
-void RelocInfo::set_call_address(Address target) {
-  ASSERT(IsPatchedReturnSequence());
-  // The 2 instructions offset assumes patched return sequence.
-  ASSERT(IsJSReturn(rmode()));
-  Memory::Address_at(pc_ + 2 * Assembler::kInstrSize) = target;
-}
-
-
-Object* RelocInfo::call_object() {
-  return *call_object_address();
-}
-
-
-Object** RelocInfo::call_object_address() {
-  ASSERT(IsPatchedReturnSequence());
-  // The 2 instructions offset assumes patched return sequence.
-  ASSERT(IsJSReturn(rmode()));
-  return reinterpret_cast<Object**>(pc_ + 2 * Assembler::kInstrSize);
-}
-
-
-void RelocInfo::set_call_object(Object* target) {
-  *call_object_address() = target;
-}
-
-
-bool RelocInfo::IsPatchedReturnSequence() {
-  // On ARM a "call instruction" is actually two instructions.
-  //   mov lr, pc
-  //   ldr pc, [pc, #XXX]
-  return (Assembler::instr_at(pc_) == kMovLrPc)
-          && ((Assembler::instr_at(pc_ + Assembler::kInstrSize) & kLdrPCPattern)
-              == kLdrPCPattern);
-}
-
-
-Operand::Operand(int32_t immediate, RelocInfo::Mode rmode)  {
-  rm_ = no_reg;
-  imm32_ = immediate;
-  rmode_ = rmode;
-}
-
-
-Operand::Operand(const char* s) {
-  rm_ = no_reg;
-  imm32_ = reinterpret_cast<int32_t>(s);
-  rmode_ = RelocInfo::EMBEDDED_STRING;
-}
-
-
-Operand::Operand(const ExternalReference& f)  {
-  rm_ = no_reg;
-  imm32_ = reinterpret_cast<int32_t>(f.address());
-  rmode_ = RelocInfo::EXTERNAL_REFERENCE;
-}
-
-
-Operand::Operand(Smi* value) {
-  rm_ = no_reg;
-  imm32_ =  reinterpret_cast<intptr_t>(value);
-  rmode_ = RelocInfo::NONE;
-}
-
-
-Operand::Operand(Register rm) {
-  rm_ = rm;
-  rs_ = no_reg;
-  shift_op_ = LSL;
-  shift_imm_ = 0;
-}
-
-
-bool Operand::is_reg() const {
-  return rm_.is_valid() &&
-         rs_.is(no_reg) &&
-         shift_op_ == LSL &&
-         shift_imm_ == 0;
-}
-
-
-void Assembler::CheckBuffer() {
-  if (buffer_space() <= kGap) {
-    GrowBuffer();
-  }
-  if (pc_offset() >= next_buffer_check_) {
-    CheckConstPool(false, true);
-  }
-}
-
-
-void Assembler::emit(Instr x) {
-  CheckBuffer();
-  *reinterpret_cast<Instr*>(pc_) = x;
-  pc_ += kInstrSize;
-}
-
-
-Address Assembler::target_address_address_at(Address pc) {
-  Address target_pc = pc;
-  Instr instr = Memory::int32_at(target_pc);
-  // If we have a bx instruction, the instruction before the bx is
-  // what we need to patch.
-  static const int32_t kBxInstMask = 0x0ffffff0;
-  static const int32_t kBxInstPattern = 0x012fff10;
-  if ((instr & kBxInstMask) == kBxInstPattern) {
-    target_pc -= kInstrSize;
-    instr = Memory::int32_at(target_pc);
-  }
-  // Verify that the instruction to patch is a
-  // ldr<cond> <Rd>, [pc +/- offset_12].
-  ASSERT((instr & 0x0f7f0000) == 0x051f0000);
-  int offset = instr & 0xfff;  // offset_12 is unsigned
-  if ((instr & (1 << 23)) == 0) offset = -offset;  // U bit defines offset sign
-  // Verify that the constant pool comes after the instruction referencing it.
-  ASSERT(offset >= -4);
-  return target_pc + offset + 8;
-}
-
-
-Address Assembler::target_address_at(Address pc) {
-  return Memory::Address_at(target_address_address_at(pc));
-}
-
-
-void Assembler::set_target_at(Address constant_pool_entry,
-                              Address target) {
-  Memory::Address_at(constant_pool_entry) = target;
-}
-
-
-void Assembler::set_target_address_at(Address pc, Address target) {
-  Memory::Address_at(target_address_address_at(pc)) = target;
-  // Intuitively, we would think it is necessary to flush the instruction cache
-  // after patching a target address in the code as follows:
-  //   CPU::FlushICache(pc, sizeof(target));
-  // However, on ARM, no instruction was actually patched by the assignment
-  // above; the target address is not part of an instruction, it is patched in
-  // the constant pool and is read via a data access; the instruction accessing
-  // this address in the constant pool remains unchanged.
-}
-
-} }  // namespace v8::internal
-
-#endif  // V8_ARM_ASSEMBLER_THUMB2_INL_H_