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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 "base/bit_utils.h"
#include "quick/quick_method_frame_info.h"
namespace art {
namespace x86_64 {
static constexpr uintptr_t gZero = 0;
void X86_64Context::Reset() {
std::fill_n(gprs_, arraysize(gprs_), nullptr);
std::fill_n(fprs_, arraysize(fprs_), nullptr);
gprs_[RSP] = &rsp_;
gprs_[RDI] = &arg0_;
// Initialize registers with easy to spot debug values.
rsp_ = X86_64Context::kBadGprBase + RSP;
rip_ = X86_64Context::kBadGprBase + kNumberOfCpuRegisters;
arg0_ = 0;
}
void X86_64Context::FillCalleeSaves(uint8_t* frame, const QuickMethodFrameInfo& frame_info) {
int spill_pos = 0;
// Core registers come first, from the highest down to the lowest.
uint32_t core_regs =
frame_info.CoreSpillMask() & ~(static_cast<uint32_t>(-1) << kNumberOfCpuRegisters);
DCHECK_EQ(1, POPCOUNT(frame_info.CoreSpillMask() & ~core_regs)); // Return address spill.
for (uint32_t core_reg : HighToLowBits(core_regs)) {
gprs_[core_reg] = CalleeSaveAddress(frame, spill_pos, frame_info.FrameSizeInBytes());
++spill_pos;
}
DCHECK_EQ(spill_pos, POPCOUNT(frame_info.CoreSpillMask()) - 1);
// FP registers come second, from the highest down to the lowest.
uint32_t fp_regs = frame_info.FpSpillMask();
DCHECK_EQ(0u, fp_regs & (static_cast<uint32_t>(-1) << kNumberOfFloatRegisters));
for (uint32_t fp_reg : HighToLowBits(fp_regs)) {
fprs_[fp_reg] = reinterpret_cast<uint64_t*>(
CalleeSaveAddress(frame, spill_pos, frame_info.FrameSizeInBytes()));
++spill_pos;
}
DCHECK_EQ(spill_pos,
POPCOUNT(frame_info.CoreSpillMask()) - 1 + POPCOUNT(frame_info.FpSpillMask()));
}
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;
}
void X86_64Context::SetGPR(uint32_t reg, uintptr_t value) {
CHECK_LT(reg, static_cast<uint32_t>(kNumberOfCpuRegisters));
DCHECK(IsAccessibleGPR(reg));
CHECK_NE(gprs_[reg], &gZero);
*gprs_[reg] = value;
}
void X86_64Context::SetFPR(uint32_t reg, uintptr_t value) {
CHECK_LT(reg, static_cast<uint32_t>(kNumberOfFloatRegisters));
DCHECK(IsAccessibleFPR(reg));
CHECK_NE(fprs_[reg], reinterpret_cast<const uint64_t*>(&gZero));
*fprs_[reg] = value;
}
extern "C" NO_RETURN 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);
UNREACHABLE();
#endif
}
} // namespace x86_64
} // namespace art