153 lines
6.1 KiB
C++
153 lines
6.1 KiB
C++
// Copyright 2017, VIXL authors
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// All rights reserved.
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//
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// Redistribution and use in source and binary forms, with or without
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// modification, are permitted provided that the following conditions are met:
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//
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// * Redistributions of source code must retain the above copyright notice,
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// this list of conditions and the following disclaimer.
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// * Redistributions in binary form must reproduce the above copyright notice,
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// this list of conditions and the following disclaimer in the documentation
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// and/or other materials provided with the distribution.
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// * Neither the name of ARM Limited nor the names of its contributors may be
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// used to endorse or promote products derived from this software without
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// specific prior written permission.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS CONTRIBUTORS "AS IS" AND
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// ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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// WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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// DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE
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// FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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// DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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// SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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// CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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// OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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#include "location-aarch32.h"
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#include "assembler-aarch32.h"
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#include "macro-assembler-aarch32.h"
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namespace vixl {
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namespace aarch32 {
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bool Location::Needs16BitPadding(int32_t location) const {
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if (!HasForwardReferences()) return false;
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const ForwardRef& last_ref = GetLastForwardReference();
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int32_t min_location_last_ref = last_ref.GetMinLocation();
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VIXL_ASSERT(min_location_last_ref - location <= 2);
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return (min_location_last_ref > location);
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}
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void Location::ResolveReferences(internal::AssemblerBase* assembler) {
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// Iterate over references and call EncodeLocationFor on each of them.
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for (ForwardRefListIterator it(this); !it.Done(); it.Advance()) {
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const ForwardRef& reference = *it.Current();
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VIXL_ASSERT(reference.LocationIsEncodable(location_));
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int32_t from = reference.GetLocation();
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EncodeLocationFor(assembler, from, reference.op());
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}
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forward_.clear();
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}
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static bool Is16BitEncoding(uint16_t instr) {
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return instr < (kLowestT32_32Opcode >> 16);
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}
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void Location::EncodeLocationFor(internal::AssemblerBase* assembler,
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int32_t from,
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const Location::EmitOperator* encoder) {
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if (encoder->IsUsingT32()) {
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uint16_t* instr_ptr =
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assembler->GetBuffer()->GetOffsetAddress<uint16_t*>(from);
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if (Is16BitEncoding(instr_ptr[0])) {
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// The Encode methods always deals with uint32_t types so we need
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// to explicitly cast it.
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uint32_t instr = static_cast<uint32_t>(instr_ptr[0]);
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instr = encoder->Encode(instr, from, this);
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// The Encode method should not ever set the top 16 bits.
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VIXL_ASSERT((instr & ~0xffff) == 0);
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instr_ptr[0] = static_cast<uint16_t>(instr);
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} else {
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uint32_t instr =
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instr_ptr[1] | (static_cast<uint32_t>(instr_ptr[0]) << 16);
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instr = encoder->Encode(instr, from, this);
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instr_ptr[0] = static_cast<uint16_t>(instr >> 16);
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instr_ptr[1] = static_cast<uint16_t>(instr);
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}
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} else {
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uint32_t* instr_ptr =
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assembler->GetBuffer()->GetOffsetAddress<uint32_t*>(from);
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instr_ptr[0] = encoder->Encode(instr_ptr[0], from, this);
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}
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}
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void Location::AddForwardRef(int32_t instr_location,
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const EmitOperator& op,
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const ReferenceInfo* info) {
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VIXL_ASSERT(referenced_);
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int32_t from = instr_location + (op.IsUsingT32() ? kT32PcDelta : kA32PcDelta);
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if (info->pc_needs_aligning == ReferenceInfo::kAlignPc)
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from = AlignDown(from, 4);
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int32_t min_object_location = from + info->min_offset;
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int32_t max_object_location = from + info->max_offset;
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forward_.insert(ForwardRef(&op,
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instr_location,
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info->size,
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min_object_location,
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max_object_location,
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info->alignment));
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}
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int Location::GetMaxAlignment() const {
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int max_alignment = GetPoolObjectAlignment();
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for (ForwardRefListIterator it(const_cast<Location*>(this)); !it.Done();
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it.Advance()) {
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const ForwardRef& reference = *it.Current();
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if (reference.GetAlignment() > max_alignment)
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max_alignment = reference.GetAlignment();
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}
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return max_alignment;
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}
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int Location::GetMinLocation() const {
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int32_t min_location = 0;
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for (ForwardRefListIterator it(const_cast<Location*>(this)); !it.Done();
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it.Advance()) {
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const ForwardRef& reference = *it.Current();
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if (reference.GetMinLocation() > min_location)
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min_location = reference.GetMinLocation();
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}
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return min_location;
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}
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void Label::UpdatePoolObject(PoolObject<int32_t>* object) {
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VIXL_ASSERT(forward_.size() == 1);
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const ForwardRef& reference = forward_.Front();
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object->Update(reference.GetMinLocation(),
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reference.GetMaxLocation(),
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reference.GetAlignment());
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}
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void Label::EmitPoolObject(MacroAssemblerInterface* masm) {
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MacroAssembler* macro_assembler = static_cast<MacroAssembler*>(masm);
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// Add a new branch to this label.
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macro_assembler->GetBuffer()->EnsureSpaceFor(kMaxInstructionSizeInBytes);
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ExactAssemblyScopeWithoutPoolsCheck guard(macro_assembler,
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kMaxInstructionSizeInBytes,
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ExactAssemblyScope::kMaximumSize);
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macro_assembler->b(this);
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}
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void RawLiteral::EmitPoolObject(MacroAssemblerInterface* masm) {
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Assembler* assembler = static_cast<Assembler*>(masm->AsAssemblerBase());
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assembler->GetBuffer()->EnsureSpaceFor(GetSize());
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assembler->GetBuffer()->EmitData(GetDataAddress(), GetSize());
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}
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}
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}
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