dynarmic/src/backend_x64/interface_x64.cpp

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/* This file is part of the dynarmic project.
* Copyright (c) 2016 MerryMage
* This software may be used and distributed according to the terms of the GNU
* General Public License version 2 or any later version.
*/
#include <memory>
#include <boost/icl/interval_set.hpp>
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#include <fmt/format.h>
#ifdef DYNARMIC_USE_LLVM
#include <llvm-c/Disassembler.h>
#include <llvm-c/Target.h>
#endif
#include "backend_x64/block_of_code.h"
#include "backend_x64/emit_x64.h"
#include "backend_x64/jitstate.h"
#include "common/assert.h"
#include "common/common_types.h"
#include "common/scope_exit.h"
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#include "dynarmic/dynarmic.h"
#include "frontend/ir/basic_block.h"
#include "frontend/ir/location_descriptor.h"
#include "frontend/translate/translate.h"
#include "ir_opt/passes.h"
namespace Dynarmic {
using namespace BackendX64;
struct Jit::Impl {
Impl(Jit* jit, UserCallbacks callbacks)
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: block_of_code(callbacks, &GetCurrentBlock, this)
, jit_state()
, emitter(&block_of_code, callbacks, jit)
, callbacks(callbacks)
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, jit_interface(jit)
{}
BlockOfCode block_of_code;
JitState jit_state;
EmitX64 emitter;
const UserCallbacks callbacks;
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// Requests made during execution to invalidate the cache are queued up here.
boost::icl::interval_set<u32> invalid_cache_ranges;
bool invalidate_entire_cache = false;
void Execute(size_t cycle_count) {
block_of_code.RunCode(&jit_state, cycle_count);
}
std::string Disassemble(const IR::LocationDescriptor& descriptor) {
auto block = GetBasicBlock(descriptor);
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std::string result = fmt::format("address: {}\nsize: {} bytes\n", block.entrypoint, block.size);
#ifdef DYNARMIC_USE_LLVM
LLVMInitializeX86TargetInfo();
LLVMInitializeX86TargetMC();
LLVMInitializeX86Disassembler();
LLVMDisasmContextRef llvm_ctx = LLVMCreateDisasm("x86_64", nullptr, 0, nullptr, nullptr);
LLVMSetDisasmOptions(llvm_ctx, LLVMDisassembler_Option_AsmPrinterVariant);
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const u8* pos = static_cast<const u8*>(block.entrypoint);
const u8* end = pos + block.size;
size_t remaining = block.size;
while (pos < end) {
char buffer[80];
size_t inst_size = LLVMDisasmInstruction(llvm_ctx, const_cast<u8*>(pos), remaining, (u64)pos, buffer, sizeof(buffer));
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ASSERT(inst_size);
for (const u8* i = pos; i < pos + inst_size; i++)
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result += fmt::format("{:02x} ", *i);
for (size_t i = inst_size; i < 10; i++)
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result += " ";
result += buffer;
result += '\n';
pos += inst_size;
remaining -= inst_size;
}
LLVMDisasmDispose(llvm_ctx);
#else
result.append("(recompile with DYNARMIC_USE_LLVM=ON to disassemble the generated x86_64 code)\n");
#endif
return result;
}
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void PerformCacheInvalidation() {
if (invalidate_entire_cache) {
jit_state.ResetRSB();
block_of_code.ClearCache();
emitter.ClearCache();
invalid_cache_ranges.clear();
invalidate_entire_cache = false;
return;
}
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if (invalid_cache_ranges.empty()) {
return;
}
jit_state.ResetRSB();
emitter.InvalidateCacheRanges(invalid_cache_ranges);
invalid_cache_ranges.clear();
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}
void RequestCacheInvalidation() {
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if (jit_interface->is_executing) {
jit_state.halt_requested = true;
return;
}
PerformCacheInvalidation();
}
private:
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Jit* jit_interface;
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static CodePtr GetCurrentBlock(void *this_voidptr) {
Jit::Impl& this_ = *reinterpret_cast<Jit::Impl*>(this_voidptr);
JitState& jit_state = this_.jit_state;
u32 pc = jit_state.Reg[15];
Arm::PSR cpsr{jit_state.Cpsr};
Arm::FPSCR fpscr{jit_state.FPSCR_mode};
IR::LocationDescriptor descriptor{pc, cpsr, fpscr};
return this_.GetBasicBlock(descriptor).entrypoint;
}
EmitX64::BlockDescriptor GetBasicBlock(IR::LocationDescriptor descriptor) {
auto block = emitter.GetBasicBlock(descriptor);
if (block)
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return *block;
constexpr size_t MINIMUM_REMAINING_CODESIZE = 1 * 1024 * 1024;
if (block_of_code.SpaceRemaining() < MINIMUM_REMAINING_CODESIZE) {
invalidate_entire_cache = true;
PerformCacheInvalidation();
}
IR::Block ir_block = Arm::Translate(descriptor, callbacks.memory.ReadCode);
Optimization::GetSetElimination(ir_block);
Optimization::DeadCodeElimination(ir_block);
Optimization::ConstantPropagation(ir_block, callbacks.memory);
Optimization::DeadCodeElimination(ir_block);
Optimization::VerificationPass(ir_block);
return emitter.Emit(ir_block);
}
};
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Jit::Jit(UserCallbacks callbacks) : impl(std::make_unique<Impl>(this, callbacks)) {}
Jit::~Jit() {}
void Jit::Run(size_t cycle_count) {
ASSERT(!is_executing);
is_executing = true;
SCOPE_EXIT({ this->is_executing = false; });
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impl->jit_state.halt_requested = false;
impl->Execute(cycle_count);
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impl->PerformCacheInvalidation();
}
void Jit::ClearCache() {
impl->invalidate_entire_cache = true;
impl->RequestCacheInvalidation();
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}
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void Jit::InvalidateCacheRange(std::uint32_t start_address, std::size_t length) {
impl->invalid_cache_ranges.add(boost::icl::discrete_interval<u32>::closed(start_address, start_address + length - 1));
impl->RequestCacheInvalidation();
}
void Jit::Reset() {
ASSERT(!is_executing);
impl->jit_state = {};
}
void Jit::HaltExecution() {
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impl->jit_state.halt_requested = true;
}
std::array<u32, 16>& Jit::Regs() {
return impl->jit_state.Reg;
}
const std::array<u32, 16>& Jit::Regs() const {
return impl->jit_state.Reg;
}
std::array<u32, 64>& Jit::ExtRegs() {
return impl->jit_state.ExtReg;
}
const std::array<u32, 64>& Jit::ExtRegs() const {
return impl->jit_state.ExtReg;
}
u32& Jit::Cpsr() {
return impl->jit_state.Cpsr;
}
u32 Jit::Cpsr() const {
return impl->jit_state.Cpsr;
}
u32 Jit::Fpscr() const {
return impl->jit_state.Fpscr();
}
void Jit::SetFpscr(u32 value) const {
return impl->jit_state.SetFpscr(value);
}
std::string Jit::Disassemble(const IR::LocationDescriptor& descriptor) {
return impl->Disassemble(descriptor);
}
} // namespace Dynarmic