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/* This file is part of the dynarmic project.
* Copyright (c) 2024 MerryMage
* SPDX-License-Identifier: 0BSD
*/
#include "dynarmic/backend/riscv64/a32_address_space.h"
#include <mcl/assert.hpp>
#include "dynarmic/backend/riscv64/abi.h"
#include "dynarmic/backend/riscv64/emit_riscv64.h"
#include "dynarmic/backend/riscv64/stack_layout.h"
#include "dynarmic/frontend/A32/a32_location_descriptor.h"
#include "dynarmic/frontend/A32/translate/a32_translate.h"
#include "dynarmic/ir/opt/passes.h"
namespace Dynarmic::Backend::RV64 {
A32AddressSpace::A32AddressSpace(const A32::UserConfig& conf)
: conf(conf)
, cb(conf.code_cache_size)
, as(cb.ptr<u8*>(), conf.code_cache_size) {
EmitPrelude();
}
IR::Block A32AddressSpace::GenerateIR(IR::LocationDescriptor descriptor) const {
IR::Block ir_block = A32::Translate(A32::LocationDescriptor{descriptor}, conf.callbacks, {conf.arch_version, conf.define_unpredictable_behaviour, conf.hook_hint_instructions});
Optimization::PolyfillPass(ir_block, {});
if (conf.HasOptimization(OptimizationFlag::GetSetElimination)) {
Optimization::A32GetSetElimination(ir_block, {.convert_nzc_to_nz = true});
Optimization::DeadCodeElimination(ir_block);
}
if (conf.HasOptimization(OptimizationFlag::ConstProp)) {
Optimization::A32ConstantMemoryReads(ir_block, conf.callbacks);
Optimization::ConstantPropagation(ir_block);
Optimization::DeadCodeElimination(ir_block);
}
Optimization::VerificationPass(ir_block);
return ir_block;
}
CodePtr A32AddressSpace::Get(IR::LocationDescriptor descriptor) {
if (const auto iter = block_entries.find(descriptor.Value()); iter != block_entries.end()) {
return iter->second;
}
return nullptr;
}
CodePtr A32AddressSpace::GetOrEmit(IR::LocationDescriptor descriptor) {
if (CodePtr block_entry = Get(descriptor)) {
return block_entry;
}
IR::Block ir_block = GenerateIR(descriptor);
const EmittedBlockInfo block_info = Emit(std::move(ir_block));
block_infos.insert_or_assign(descriptor.Value(), block_info);
block_entries.insert_or_assign(descriptor.Value(), block_info.entry_point);
return block_info.entry_point;
}
void A32AddressSpace::ClearCache() {
block_entries.clear();
block_infos.clear();
SetCursorPtr(prelude_info.end_of_prelude);
}
void A32AddressSpace::EmitPrelude() {
using namespace biscuit;
prelude_info.run_code = GetCursorPtr<PreludeInfo::RunCodeFuncType>();
// TODO: Minimize this.
as.ADDI(sp, sp, -(64 * 8 + static_cast<int32_t>(sizeof(StackLayout))));
for (u32 i = 1; i < 32; i += 1) {
if (GPR{i} == sp || GPR{i} == tp)
continue;
as.SD(GPR{i}, i * 8 + static_cast<int32_t>(sizeof(StackLayout)), sp);
}
for (u32 i = 0; i < 32; i += 1) {
as.FSD(FPR{i}, (32 + i) * 8 + static_cast<int32_t>(sizeof(StackLayout)), sp);
}
as.MV(Xstate, a1);
as.MV(Xhalt, a2);
as.JR(a0);
prelude_info.return_from_run_code = GetCursorPtr<CodePtr>();
for (u32 i = 1; i < 32; i += 1) {
if (GPR{i} == sp || GPR{i} == tp)
continue;
as.LD(GPR{i}, i * 8 + static_cast<int32_t>(sizeof(StackLayout)), sp);
}
for (u32 i = 0; i < 32; i += 1) {
as.FLD(FPR{i}, (32 + i) * 8 + static_cast<int32_t>(sizeof(StackLayout)), sp);
}
as.ADDI(sp, sp, (64 * 8 + static_cast<int32_t>(sizeof(StackLayout))));
as.JALR(ra);
prelude_info.end_of_prelude = GetCursorPtr<CodePtr>();
}
void A32AddressSpace::SetCursorPtr(CodePtr ptr) {
ptrdiff_t offset = ptr - GetMemPtr<CodePtr>();
ASSERT(offset >= 0);
as.RewindBuffer(offset);
}
size_t A32AddressSpace::GetRemainingSize() {
return conf.code_cache_size - (GetCursorPtr<sptr>() - GetMemPtr<sptr>());
}
EmittedBlockInfo A32AddressSpace::Emit(IR::Block block) {
if (GetRemainingSize() < 1024 * 1024) {
ClearCache();
}
EmittedBlockInfo block_info = EmitRV64(as, std::move(block), {
.enable_cycle_counting = conf.enable_cycle_counting,
.always_little_endian = conf.always_little_endian,
});
Link(block_info);
return block_info;
}
void A32AddressSpace::Link(EmittedBlockInfo& block_info) {
using namespace biscuit;
for (auto [ptr_offset, target] : block_info.relocations) {
Assembler a(reinterpret_cast<u8*>(block_info.entry_point) + ptr_offset, 4);
switch (target) {
case LinkTarget::ReturnFromRunCode: {
std::ptrdiff_t off = prelude_info.return_from_run_code - reinterpret_cast<CodePtr>(a.GetCursorPointer());
a.J(off);
break;
}
default:
ASSERT_FALSE("Invalid relocation target");
}
}
}
} // namespace Dynarmic::Backend::RV64
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