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/*
* Copyright (C) 2011 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "context_arm.h"
#include "mirror/art_method-inl.h"
#include "mirror/object-inl.h"
#include "quick/quick_method_frame_info.h"
#include "stack.h"
#include "thread.h"
namespace art {
namespace arm {
static constexpr uint32_t gZero = 0;
void ArmContext::Reset() {
for (size_t i = 0; i < kNumberOfCoreRegisters; i++) {
gprs_[i] = nullptr;
}
for (size_t i = 0; i < kNumberOfSRegisters; i++) {
fprs_[i] = nullptr;
}
gprs_[SP] = &sp_;
gprs_[PC] = &pc_;
// Initialize registers with easy to spot debug values.
sp_ = ArmContext::kBadGprBase + SP;
pc_ = ArmContext::kBadGprBase + PC;
}
void ArmContext::FillCalleeSaves(const StackVisitor& fr) {
mirror::ArtMethod* method = fr.GetMethod();
const QuickMethodFrameInfo frame_info = method->GetQuickFrameInfo();
size_t spill_count = POPCOUNT(frame_info.CoreSpillMask());
size_t fp_spill_count = POPCOUNT(frame_info.FpSpillMask());
if (spill_count > 0) {
// Lowest number spill is farthest away, walk registers and fill into context
int j = 1;
for (size_t i = 0; i < kNumberOfCoreRegisters; i++) {
if (((frame_info.CoreSpillMask() >> i) & 1) != 0) {
gprs_[i] = fr.CalleeSaveAddress(spill_count - j, frame_info.FrameSizeInBytes());
j++;
}
}
}
if (fp_spill_count > 0) {
// Lowest number spill is farthest away, walk registers and fill into context
int j = 1;
for (size_t i = 0; i < kNumberOfSRegisters; i++) {
if (((frame_info.FpSpillMask() >> i) & 1) != 0) {
fprs_[i] = fr.CalleeSaveAddress(spill_count + fp_spill_count - j,
frame_info.FrameSizeInBytes());
j++;
}
}
}
}
bool ArmContext::SetGPR(uint32_t reg, uintptr_t value) {
DCHECK_LT(reg, static_cast<uint32_t>(kNumberOfCoreRegisters));
DCHECK_NE(gprs_[reg], &gZero); // Can't overwrite this static value since they are never reset.
if (gprs_[reg] != nullptr) {
*gprs_[reg] = value;
return true;
} else {
return false;
}
}
bool ArmContext::SetFPR(uint32_t reg, uintptr_t value) {
DCHECK_LT(reg, static_cast<uint32_t>(kNumberOfSRegisters));
DCHECK_NE(fprs_[reg], &gZero); // Can't overwrite this static value since they are never reset.
if (fprs_[reg] != nullptr) {
*fprs_[reg] = value;
return true;
} else {
return false;
}
}
void ArmContext::SmashCallerSaves() {
// This needs to be 0 because we want a null/zero return value.
gprs_[R0] = const_cast<uint32_t*>(&gZero);
gprs_[R1] = const_cast<uint32_t*>(&gZero);
gprs_[R2] = nullptr;
gprs_[R3] = nullptr;
}
extern "C" void art_quick_do_long_jump(uint32_t*, uint32_t*);
void ArmContext::DoLongJump() {
uintptr_t gprs[kNumberOfCoreRegisters];
uint32_t fprs[kNumberOfSRegisters];
for (size_t i = 0; i < kNumberOfCoreRegisters; ++i) {
gprs[i] = gprs_[i] != nullptr ? *gprs_[i] : ArmContext::kBadGprBase + i;
}
for (size_t i = 0; i < kNumberOfSRegisters; ++i) {
fprs[i] = fprs_[i] != nullptr ? *fprs_[i] : ArmContext::kBadFprBase + i;
}
DCHECK_EQ(reinterpret_cast<uintptr_t>(Thread::Current()), gprs[TR]);
art_quick_do_long_jump(gprs, fprs);
}
} // namespace arm
} // namespace art
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