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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_x86_64.h"
#include "mirror/art_method-inl.h"
#include "mirror/object-inl.h"
#include "quick/quick_method_frame_info.h"
#include "stack.h"
namespace art {
namespace x86_64 {
static constexpr uintptr_t gZero = 0;
void X86_64Context::Reset() {
for (size_t i = 0; i < kNumberOfCpuRegisters; ++i) {
gprs_[i] = nullptr;
}
for (size_t i = 0; i < kNumberOfFloatRegisters; ++i) {
fprs_[i] = nullptr;
}
gprs_[RSP] = &rsp_;
// Initialize registers with easy to spot debug values.
rsp_ = X86_64Context::kBadGprBase + RSP;
rip_ = X86_64Context::kBadGprBase + kNumberOfCpuRegisters;
}
void X86_64Context::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.
size_t j = 2; // Offset j to skip return address spill.
for (size_t i = 0; i < kNumberOfCpuRegisters; ++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.
size_t j = 2; // Offset j to skip return address spill.
for (size_t i = 0; i < kNumberOfFloatRegisters; ++i) {
if (((frame_info.FpSpillMask() >> i) & 1) != 0) {
fprs_[i] = reinterpret_cast<uint64_t*>(
fr.CalleeSaveAddress(spill_count + fp_spill_count - j, frame_info.FrameSizeInBytes()));
j++;
}
}
}
}
void X86_64Context::SmashCallerSaves() {
// This needs to be 0 because we want a null/zero return value.
gprs_[RAX] = const_cast<uintptr_t*>(&gZero);
gprs_[RDX] = const_cast<uintptr_t*>(&gZero);
gprs_[RCX] = nullptr;
gprs_[RSI] = nullptr;
gprs_[RDI] = nullptr;
gprs_[R8] = nullptr;
gprs_[R9] = nullptr;
gprs_[R10] = nullptr;
gprs_[R11] = nullptr;
fprs_[XMM0] = nullptr;
fprs_[XMM1] = nullptr;
fprs_[XMM2] = nullptr;
fprs_[XMM3] = nullptr;
fprs_[XMM4] = nullptr;
fprs_[XMM5] = nullptr;
fprs_[XMM6] = nullptr;
fprs_[XMM7] = nullptr;
fprs_[XMM8] = nullptr;
fprs_[XMM9] = nullptr;
fprs_[XMM10] = nullptr;
fprs_[XMM11] = nullptr;
}
bool X86_64Context::SetGPR(uint32_t reg, uintptr_t value) {
CHECK_LT(reg, static_cast<uint32_t>(kNumberOfCpuRegisters));
CHECK_NE(gprs_[reg], &gZero);
if (gprs_[reg] != nullptr) {
*gprs_[reg] = value;
return true;
} else {
return false;
}
}
bool X86_64Context::SetFPR(uint32_t reg, uintptr_t value) {
CHECK_LT(reg, static_cast<uint32_t>(kNumberOfFloatRegisters));
CHECK_NE(fprs_[reg], reinterpret_cast<const uint64_t*>(&gZero));
if (fprs_[reg] != nullptr) {
*fprs_[reg] = value;
return true;
} else {
return false;
}
}
extern "C" void art_quick_do_long_jump(uintptr_t*, uintptr_t*);
void X86_64Context::DoLongJump() {
#if defined(__x86_64__)
uintptr_t gprs[kNumberOfCpuRegisters + 1];
uintptr_t fprs[kNumberOfFloatRegisters];
for (size_t i = 0; i < kNumberOfCpuRegisters; ++i) {
gprs[kNumberOfCpuRegisters - i - 1] = gprs_[i] != nullptr ? *gprs_[i] : X86_64Context::kBadGprBase + i;
}
for (size_t i = 0; i < kNumberOfFloatRegisters; ++i) {
fprs[i] = fprs_[i] != nullptr ? *fprs_[i] : X86_64Context::kBadFprBase + i;
}
// We want to load the stack pointer one slot below so that the ret will pop eip.
uintptr_t rsp = gprs[kNumberOfCpuRegisters - RSP - 1] - sizeof(intptr_t);
gprs[kNumberOfCpuRegisters] = rsp;
*(reinterpret_cast<uintptr_t*>(rsp)) = rip_;
art_quick_do_long_jump(gprs, fprs);
#else
UNIMPLEMENTED(FATAL);
#endif
}
} // namespace x86_64
} // namespace art
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