// 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 2012 the V8 project authors. All rights reserved. #ifndef V8_MIPS_ASSEMBLER_MIPS_INL_H_ #define V8_MIPS_ASSEMBLER_MIPS_INL_H_ #include "src/mips/assembler-mips.h" #include "src/assembler.h" #include "src/debug/debug.h" #include "src/objects-inl.h" namespace v8 { namespace internal { bool CpuFeatures::SupportsOptimizer() { return IsSupported(FPU); } bool CpuFeatures::SupportsWasmSimd128() { return IsSupported(MIPS_SIMD); } // ----------------------------------------------------------------------------- // Operand and MemOperand. bool Operand::is_reg() const { return rm_.is_valid(); } int32_t Operand::immediate() const { DCHECK(!is_reg()); DCHECK(!IsHeapObjectRequest()); return value_.immediate; } // ----------------------------------------------------------------------------- // RelocInfo. void RelocInfo::apply(intptr_t delta) { if (IsInternalReference(rmode_) || IsInternalReferenceEncoded(rmode_)) { // Absolute code pointer inside code object moves with the code object. Assembler::RelocateInternalReference(rmode_, pc_, delta); } else if (IsRelativeCodeTarget(rmode_)) { Assembler::RelocateRelativeReference(rmode_, pc_, delta); } } Address RelocInfo::target_address() { DCHECK(IsCodeTargetMode(rmode_) || IsRuntimeEntry(rmode_) || IsWasmCall(rmode_)); return Assembler::target_address_at(pc_, constant_pool_); } Address RelocInfo::target_address_address() { DCHECK(HasTargetAddressAddress()); // Read the address of the word containing the target_address in an // instruction stream. // The only architecture-independent user of this function is the serializer. // The serializer uses it to find out how many raw bytes of instruction to // output before the next target. // For an instruction like LUI/ORI where the target bits are mixed into the // instruction bits, the size of the target will be zero, indicating that the // serializer should not step forward in memory after a target is resolved // and written. In this case the target_address_address function should // return the end of the instructions to be patched, allowing the // deserializer to deserialize the instructions as raw bytes and put them in // place, ready to be patched with the target. After jump optimization, // that is the address of the instruction that follows J/JAL/JR/JALR // instruction. if (IsMipsArchVariant(kMips32r6)) { // On R6 we don't move to the end of the instructions to be patched, but one // instruction before, because if these instructions are at the end of the // code object it can cause errors in the deserializer. return pc_ + (Assembler::kInstructionsFor32BitConstant - 1) * kInstrSize; } else { return pc_ + Assembler::kInstructionsFor32BitConstant * kInstrSize; } } Address RelocInfo::constant_pool_entry_address() { UNREACHABLE(); } int RelocInfo::target_address_size() { return Assembler::kSpecialTargetSize; } Address Assembler::target_address_from_return_address(Address pc) { return pc - kCallTargetAddressOffset; } void Assembler::deserialization_set_special_target_at( Address instruction_payload, Code code, Address target) { if (IsMipsArchVariant(kMips32r6)) { // On R6 the address location is shifted by one instruction set_target_address_at( instruction_payload - (kInstructionsFor32BitConstant - 1) * kInstrSize, !code.is_null() ? code->constant_pool() : kNullAddress, target); } else { set_target_address_at( instruction_payload - kInstructionsFor32BitConstant * kInstrSize, !code.is_null() ? code->constant_pool() : kNullAddress, target); } } int Assembler::deserialization_special_target_size( Address instruction_payload) { return kSpecialTargetSize; } void Assembler::set_target_internal_reference_encoded_at(Address pc, Address target) { Instr instr1 = Assembler::instr_at(pc + 0 * kInstrSize); Instr instr2 = Assembler::instr_at(pc + 1 * kInstrSize); DCHECK(Assembler::IsLui(instr1)); DCHECK(Assembler::IsOri(instr2) || Assembler::IsJicOrJialc(instr2)); instr1 &= ~kImm16Mask; instr2 &= ~kImm16Mask; int32_t imm = static_cast<int32_t>(target); DCHECK_EQ(imm & 3, 0); if (Assembler::IsJicOrJialc(instr2)) { // Encoded internal references are lui/jic load of 32-bit absolute address. uint32_t lui_offset_u, jic_offset_u; Assembler::UnpackTargetAddressUnsigned(imm, lui_offset_u, jic_offset_u); Assembler::instr_at_put(pc + 0 * kInstrSize, instr1 | lui_offset_u); Assembler::instr_at_put(pc + 1 * kInstrSize, instr2 | jic_offset_u); } else { // Encoded internal references are lui/ori load of 32-bit absolute address. PatchLuiOriImmediate(pc, imm, instr1, 0 * kInstrSize, instr2, 1 * kInstrSize); } // Currently used only by deserializer, and all code will be flushed // after complete deserialization, no need to flush on each reference. } void Assembler::deserialization_set_target_internal_reference_at( Address pc, Address target, RelocInfo::Mode mode) { if (RelocInfo::IsInternalReferenceEncoded(mode)) { DCHECK(IsLui(instr_at(pc))); set_target_internal_reference_encoded_at(pc, target); } else { DCHECK(RelocInfo::IsInternalReference(mode)); Memory<Address>(pc) = target; } } HeapObject RelocInfo::target_object() { DCHECK(IsCodeTarget(rmode_) || IsEmbeddedObject(rmode_)); return HeapObject::cast( Object(Assembler::target_address_at(pc_, constant_pool_))); } Handle<HeapObject> RelocInfo::target_object_handle(Assembler* origin) { if (IsCodeTarget(rmode_) || IsEmbeddedObject(rmode_)) { return Handle<HeapObject>(reinterpret_cast<Address*>( Assembler::target_address_at(pc_, constant_pool_))); } DCHECK(IsRelativeCodeTarget(rmode_)); return origin->relative_code_target_object_handle_at(pc_); } void RelocInfo::set_target_object(Heap* heap, HeapObject target, WriteBarrierMode write_barrier_mode, ICacheFlushMode icache_flush_mode) { DCHECK(IsCodeTarget(rmode_) || IsEmbeddedObject(rmode_)); Assembler::set_target_address_at(pc_, constant_pool_, target->ptr(), icache_flush_mode); if (write_barrier_mode == UPDATE_WRITE_BARRIER && !host().is_null()) { WriteBarrierForCode(host(), this, target); } } Address RelocInfo::target_external_reference() { DCHECK(IsExternalReference(rmode_)); return Assembler::target_address_at(pc_, constant_pool_); } void RelocInfo::set_target_external_reference( Address target, ICacheFlushMode icache_flush_mode) { DCHECK(IsExternalReference(rmode_)); Assembler::set_target_address_at(pc_, constant_pool_, target, icache_flush_mode); } Address RelocInfo::target_internal_reference() { if (IsInternalReference(rmode_)) { return Memory<Address>(pc_); } else { // Encoded internal references are lui/ori or lui/jic load of 32-bit // absolute address. DCHECK(IsInternalReferenceEncoded(rmode_)); Instr instr1 = Assembler::instr_at(pc_ + 0 * kInstrSize); Instr instr2 = Assembler::instr_at(pc_ + 1 * kInstrSize); DCHECK(Assembler::IsLui(instr1)); DCHECK(Assembler::IsOri(instr2) || Assembler::IsJicOrJialc(instr2)); if (Assembler::IsJicOrJialc(instr2)) { return static_cast<Address>( Assembler::CreateTargetAddress(instr1, instr2)); } return static_cast<Address>(Assembler::GetLuiOriImmediate(instr1, instr2)); } } Address RelocInfo::target_internal_reference_address() { DCHECK(IsInternalReference(rmode_) || IsInternalReferenceEncoded(rmode_)); return pc_; } Address RelocInfo::target_runtime_entry(Assembler* origin) { DCHECK(IsRuntimeEntry(rmode_)); return target_address(); } void RelocInfo::set_target_runtime_entry(Address target, WriteBarrierMode write_barrier_mode, ICacheFlushMode icache_flush_mode) { DCHECK(IsRuntimeEntry(rmode_)); if (target_address() != target) set_target_address(target, write_barrier_mode, icache_flush_mode); } Address RelocInfo::target_off_heap_target() { DCHECK(IsOffHeapTarget(rmode_)); return Assembler::target_address_at(pc_, constant_pool_); } void RelocInfo::WipeOut() { DCHECK(IsEmbeddedObject(rmode_) || IsCodeTarget(rmode_) || IsRuntimeEntry(rmode_) || IsExternalReference(rmode_) || IsInternalReference(rmode_) || IsInternalReferenceEncoded(rmode_) || IsOffHeapTarget(rmode_)); if (IsInternalReference(rmode_)) { Memory<Address>(pc_) = kNullAddress; } else if (IsInternalReferenceEncoded(rmode_)) { Assembler::set_target_internal_reference_encoded_at(pc_, kNullAddress); } else { Assembler::set_target_address_at(pc_, constant_pool_, kNullAddress); } } Handle<Code> Assembler::relative_code_target_object_handle_at( Address pc) const { Instr instr1 = instr_at(pc); Instr instr2 = instr_at(pc + kInstrSize); DCHECK(IsLui(instr1)); DCHECK(IsOri(instr2) || IsNal(instr2)); DCHECK(IsNal(instr2) || IsNal(instr_at(pc - kInstrSize))); if (IsNal(instr2)) { instr2 = instr_at(pc + 2 * kInstrSize); } // Interpret 2 instructions generated by li (lui/ori). int code_target_index = GetLuiOriImmediate(instr1, instr2); return GetCodeTarget(code_target_index); } // ----------------------------------------------------------------------------- // Assembler. void Assembler::CheckBuffer() { if (buffer_space() <= kGap) { GrowBuffer(); } } void Assembler::CheckForEmitInForbiddenSlot() { if (!is_buffer_growth_blocked()) { CheckBuffer(); } if (IsPrevInstrCompactBranch()) { // Nop instruction to precede a CTI in forbidden slot: Instr nop = SPECIAL | SLL; *reinterpret_cast<Instr*>(pc_) = nop; pc_ += kInstrSize; ClearCompactBranchState(); } } void Assembler::EmitHelper(Instr x, CompactBranchType is_compact_branch) { if (IsPrevInstrCompactBranch()) { if (Instruction::IsForbiddenAfterBranchInstr(x)) { // Nop instruction to precede a CTI in forbidden slot: Instr nop = SPECIAL | SLL; *reinterpret_cast<Instr*>(pc_) = nop; pc_ += kInstrSize; } ClearCompactBranchState(); } *reinterpret_cast<Instr*>(pc_) = x; pc_ += kInstrSize; if (is_compact_branch == CompactBranchType::COMPACT_BRANCH) { EmittedCompactBranchInstruction(); } CheckTrampolinePoolQuick(); } template <> inline void Assembler::EmitHelper(uint8_t x); template <typename T> void Assembler::EmitHelper(T x) { *reinterpret_cast<T*>(pc_) = x; pc_ += sizeof(x); CheckTrampolinePoolQuick(); } template <> void Assembler::EmitHelper(uint8_t x) { *reinterpret_cast<uint8_t*>(pc_) = x; pc_ += sizeof(x); if (reinterpret_cast<intptr_t>(pc_) % kInstrSize == 0) { CheckTrampolinePoolQuick(); } } void Assembler::emit(Instr x, CompactBranchType is_compact_branch) { if (!is_buffer_growth_blocked()) { CheckBuffer(); } EmitHelper(x, is_compact_branch); } EnsureSpace::EnsureSpace(Assembler* assembler) { assembler->CheckBuffer(); } } // namespace internal } // namespace v8 #endif // V8_MIPS_ASSEMBLER_MIPS_INL_H_