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/*
* Copyright (C) 2014 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 <stdint.h>
#include "context_arm64.h"
#include "mirror/art_method.h"
#include "mirror/object-inl.h"
#include "stack.h"
#include "thread.h"
namespace art {
namespace arm64 {
static const uint64_t gZero = 0;
void Arm64Context::Reset() {
for (size_t i = 0; i < kNumberOfCoreRegisters; i++) {
gprs_[i] = NULL;
}
for (size_t i = 0; i < kNumberOfDRegisters; i++) {
fprs_[i] = NULL;
}
gprs_[SP] = &sp_;
gprs_[LR] = &pc_;
// Initialize registers with easy to spot debug values.
sp_ = Arm64Context::kBadGprBase + SP;
pc_ = Arm64Context::kBadGprBase + LR;
}
void Arm64Context::FillCalleeSaves(const StackVisitor& fr) {
mirror::ArtMethod* method = fr.GetMethod();
uint32_t core_spills = method->GetCoreSpillMask();
uint32_t fp_core_spills = method->GetFpSpillMask();
size_t spill_count = __builtin_popcount(core_spills);
size_t fp_spill_count = __builtin_popcount(fp_core_spills);
size_t frame_size = method->GetFrameSizeInBytes();
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 (((core_spills >> i) & 1) != 0) {
gprs_[i] = fr.CalleeSaveAddress(spill_count - j, frame_size);
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 < kNumberOfDRegisters; i++) {
if (((fp_core_spills >> i) & 1) != 0) {
fprs_[i] = fr.CalleeSaveAddress(spill_count + fp_spill_count - j, frame_size);
j++;
}
}
}
}
void Arm64Context::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.
DCHECK(gprs_[reg] != NULL);
*gprs_[reg] = value;
}
void Arm64Context::SmashCallerSaves() {
// This needs to be 0 because we want a null/zero return value.
gprs_[X0] = const_cast<uint64_t*>(&gZero);
gprs_[X1] = NULL;
gprs_[X2] = NULL;
gprs_[X3] = NULL;
gprs_[X4] = NULL;
gprs_[X5] = NULL;
gprs_[X6] = NULL;
gprs_[X7] = NULL;
gprs_[X8] = NULL;
gprs_[X9] = NULL;
gprs_[X10] = NULL;
gprs_[X11] = NULL;
gprs_[X12] = NULL;
gprs_[X13] = NULL;
gprs_[X14] = NULL;
gprs_[X15] = NULL;
fprs_[D8] = NULL;
fprs_[D9] = NULL;
fprs_[D10] = NULL;
fprs_[D11] = NULL;
fprs_[D12] = NULL;
fprs_[D13] = NULL;
fprs_[D14] = NULL;
fprs_[D15] = NULL;
}
extern "C" void art_quick_do_long_jump(uint64_t*, uint64_t*);
void Arm64Context::DoLongJump() {
uint64_t gprs[32];
uint64_t fprs[32];
for (size_t i = 0; i < kNumberOfCoreRegisters; ++i) {
gprs[i] = gprs_[i] != NULL ? *gprs_[i] : Arm64Context::kBadGprBase + i;
}
for (size_t i = 0; i < kNumberOfDRegisters; ++i) {
fprs[i] = fprs_[i] != NULL ? *fprs_[i] : Arm64Context::kBadGprBase + i;
}
DCHECK_EQ(reinterpret_cast<uintptr_t>(Thread::Current()), gprs[TR]);
art_quick_do_long_jump(gprs, fprs);
}
} // namespace arm64
} // namespace art
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