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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 "base/bit_utils.h"
#include "base/bit_utils_iterator.h"
#include "quick/quick_method_frame_info.h"
#include "thread-current-inl.h"
#if __has_feature(hwaddress_sanitizer)
#include <sanitizer/hwasan_interface.h>
#else
#define __hwasan_handle_longjmp(sp)
#endif
namespace art {
namespace arm64 {
static constexpr uint64_t gZero = 0;
void Arm64Context::Reset() {
std::fill_n(gprs_, arraysize(gprs_), nullptr);
std::fill_n(fprs_, arraysize(fprs_), nullptr);
gprs_[SP] = &sp_;
gprs_[kPC] = &pc_;
gprs_[X0] = &arg0_;
// Initialize registers with easy to spot debug values.
sp_ = Arm64Context::kBadGprBase + SP;
pc_ = Arm64Context::kBadGprBase + kPC;
arg0_ = 0;
}
void Arm64Context::FillCalleeSaves(uint8_t* frame, const QuickMethodFrameInfo& frame_info) {
int spill_pos = 0;
// Core registers come first, from the highest down to the lowest.
for (uint32_t core_reg : HighToLowBits(frame_info.CoreSpillMask())) {
gprs_[core_reg] = CalleeSaveAddress(frame, spill_pos, frame_info.FrameSizeInBytes());
++spill_pos;
}
DCHECK_EQ(spill_pos, POPCOUNT(frame_info.CoreSpillMask()));
// FP registers come second, from the highest down to the lowest.
for (uint32_t fp_reg : HighToLowBits(frame_info.FpSpillMask())) {
fprs_[fp_reg] = CalleeSaveAddress(frame, spill_pos, frame_info.FrameSizeInBytes());
++spill_pos;
}
DCHECK_EQ(spill_pos, POPCOUNT(frame_info.CoreSpillMask()) + POPCOUNT(frame_info.FpSpillMask()));
}
void Arm64Context::SetGPR(uint32_t reg, uintptr_t value) {
DCHECK_LT(reg, arraysize(gprs_));
// Note: we use kPC == XZR, so do not ensure that reg != XZR.
DCHECK(IsAccessibleGPR(reg));
DCHECK_NE(gprs_[reg], &gZero); // Can't overwrite this static value since they are never reset.
*gprs_[reg] = value;
}
void Arm64Context::SetFPR(uint32_t reg, uintptr_t value) {
DCHECK_LT(reg, static_cast<uint32_t>(kNumberOfDRegisters));
DCHECK(IsAccessibleFPR(reg));
DCHECK_NE(fprs_[reg], &gZero); // Can't overwrite this static value since they are never reset.
*fprs_[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] = nullptr;
gprs_[X2] = nullptr;
gprs_[X3] = nullptr;
gprs_[X4] = nullptr;
gprs_[X5] = nullptr;
gprs_[X6] = nullptr;
gprs_[X7] = nullptr;
gprs_[X8] = nullptr;
gprs_[X9] = nullptr;
gprs_[X10] = nullptr;
gprs_[X11] = nullptr;
gprs_[X12] = nullptr;
gprs_[X13] = nullptr;
gprs_[X14] = nullptr;
gprs_[X15] = nullptr;
gprs_[X18] = nullptr;
// d0-d7, d16-d31 are caller-saved; d8-d15 are callee-saved.
fprs_[D0] = nullptr;
fprs_[D1] = nullptr;
fprs_[D2] = nullptr;
fprs_[D3] = nullptr;
fprs_[D4] = nullptr;
fprs_[D5] = nullptr;
fprs_[D6] = nullptr;
fprs_[D7] = nullptr;
fprs_[D16] = nullptr;
fprs_[D17] = nullptr;
fprs_[D18] = nullptr;
fprs_[D19] = nullptr;
fprs_[D20] = nullptr;
fprs_[D21] = nullptr;
fprs_[D22] = nullptr;
fprs_[D23] = nullptr;
fprs_[D24] = nullptr;
fprs_[D25] = nullptr;
fprs_[D26] = nullptr;
fprs_[D27] = nullptr;
fprs_[D28] = nullptr;
fprs_[D29] = nullptr;
fprs_[D30] = nullptr;
fprs_[D31] = nullptr;
}
extern "C" NO_RETURN void art_quick_do_long_jump(uint64_t*, uint64_t*);
void Arm64Context::DoLongJump() {
uint64_t gprs[arraysize(gprs_)];
uint64_t fprs[kNumberOfDRegisters];
// The long jump routine called below expects to find the value for SP at index 31.
DCHECK_EQ(SP, 31);
for (size_t i = 0; i < arraysize(gprs_); ++i) {
gprs[i] = gprs_[i] != nullptr ? *gprs_[i] : Arm64Context::kBadGprBase + i;
}
for (size_t i = 0; i < kNumberOfDRegisters; ++i) {
fprs[i] = fprs_[i] != nullptr ? *fprs_[i] : Arm64Context::kBadFprBase + i;
}
// Ensure the Thread Register contains the address of the current thread.
DCHECK_EQ(reinterpret_cast<uintptr_t>(Thread::Current()), gprs[TR]);
// Tell HWASan about the new stack top.
__hwasan_handle_longjmp(reinterpret_cast<void*>(gprs[SP]));
// The Marking Register will be updated by art_quick_do_long_jump.
art_quick_do_long_jump(gprs, fprs);
}
} // namespace arm64
} // namespace art
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