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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_mips.h"
#include "base/bit_utils.h"
#include "base/bit_utils_iterator.h"
#include "quick/quick_method_frame_info.h"
namespace art {
namespace mips {
static constexpr uint32_t gZero = 0;
void MipsContext::Reset() {
std::fill_n(gprs_, arraysize(gprs_), nullptr);
std::fill_n(fprs_, arraysize(fprs_), nullptr);
gprs_[SP] = &sp_;
gprs_[T9] = &t9_;
gprs_[A0] = &arg0_;
// Initialize registers with easy to spot debug values.
sp_ = MipsContext::kBadGprBase + SP;
t9_ = MipsContext::kBadGprBase + T9;
arg0_ = 0;
}
void MipsContext::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())) {
// If the $ZERO register shows up in the list of registers to
// be saved this was only done to properly align the floating
// point register save locations to addresses which are
// multiples of 8. We only store the address of a register in
// gprs_ if the register is not the $ZERO register. The $ZERO
// register is read-only so there's never a reason to save it
// on the stack.
if (core_reg != 0u) {
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 MipsContext::SetGPR(uint32_t reg, uintptr_t value) {
CHECK_LT(reg, static_cast<uint32_t>(kNumberOfCoreRegisters));
DCHECK(IsAccessibleGPR(reg));
CHECK_NE(gprs_[reg], &gZero); // Can't overwrite this static value since they are never reset.
*gprs_[reg] = value;
}
void MipsContext::SetFPR(uint32_t reg, uintptr_t value) {
CHECK_LT(reg, static_cast<uint32_t>(kNumberOfFRegisters));
DCHECK(IsAccessibleFPR(reg));
CHECK_NE(fprs_[reg], &gZero); // Can't overwrite this static value since they are never reset.
*fprs_[reg] = value;
}
void MipsContext::SmashCallerSaves() {
// This needs to be 0 because we want a null/zero return value.
gprs_[V0] = const_cast<uint32_t*>(&gZero);
gprs_[V1] = const_cast<uint32_t*>(&gZero);
gprs_[A1] = nullptr;
gprs_[A2] = nullptr;
gprs_[A3] = nullptr;
gprs_[T0] = nullptr;
gprs_[T1] = nullptr;
fprs_[F8] = nullptr;
fprs_[F9] = nullptr;
fprs_[F10] = nullptr;
fprs_[F11] = nullptr;
fprs_[F12] = nullptr;
fprs_[F13] = nullptr;
fprs_[F14] = nullptr;
fprs_[F15] = nullptr;
fprs_[F16] = nullptr;
fprs_[F17] = nullptr;
fprs_[F18] = nullptr;
fprs_[F19] = nullptr;
}
extern "C" NO_RETURN void art_quick_do_long_jump(uint32_t*, uint32_t*);
void MipsContext::DoLongJump() {
uintptr_t gprs[kNumberOfCoreRegisters];
// Align fprs[] so that art_quick_do_long_jump() can load FPU
// registers from it using the ldc1 instruction.
uint32_t fprs[kNumberOfFRegisters] __attribute__((aligned(8)));
for (size_t i = 0; i < kNumberOfCoreRegisters; ++i) {
gprs[i] = gprs_[i] != nullptr ? *gprs_[i] : MipsContext::kBadGprBase + i;
}
for (size_t i = 0; i < kNumberOfFRegisters; ++i) {
fprs[i] = fprs_[i] != nullptr ? *fprs_[i] : MipsContext::kBadFprBase + i;
}
art_quick_do_long_jump(gprs, fprs);
}
} // namespace mips
} // namespace art
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