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// Copyright 2008 Dolphin Emulator Project
// SPDX-License-Identifier: GPL-2.0-or-later
#include "UICommon/Disassembler.h"
#include <sstream>
#if defined(HAVE_LLVM)
#include <fmt/format.h>
#include <llvm-c/Disassembler.h>
#include <llvm-c/Target.h>
#elif defined(_M_X86)
#include <disasm.h> // Bochs
#endif
#include "Common/Assert.h"
#include "Common/VariantUtil.h"
#include "Core/PowerPC/JitInterface.h"
#include "Core/System.h"
#if defined(HAVE_LLVM)
class HostDisassemblerLLVM : public HostDisassembler
{
public:
HostDisassemblerLLVM(const std::string& host_disasm, int inst_size = -1,
const std::string& cpu = "");
~HostDisassemblerLLVM()
{
if (m_can_disasm)
LLVMDisasmDispose(m_llvm_context);
}
private:
bool m_can_disasm;
LLVMDisasmContextRef m_llvm_context;
int m_instruction_size;
std::string DisassembleHostBlock(const u8* code_start, const u32 code_size,
u32* host_instructions_count, u64 starting_pc) override;
};
HostDisassemblerLLVM::HostDisassemblerLLVM(const std::string& host_disasm, int inst_size,
const std::string& cpu)
: m_can_disasm(false), m_instruction_size(inst_size)
{
LLVMInitializeAllTargetInfos();
LLVMInitializeAllTargetMCs();
LLVMInitializeAllDisassemblers();
m_llvm_context =
LLVMCreateDisasmCPU(host_disasm.c_str(), cpu.c_str(), nullptr, 0, nullptr, nullptr);
// Couldn't create llvm context
if (!m_llvm_context)
return;
LLVMSetDisasmOptions(m_llvm_context, LLVMDisassembler_Option_AsmPrinterVariant |
LLVMDisassembler_Option_PrintLatency);
m_can_disasm = true;
}
std::string HostDisassemblerLLVM::DisassembleHostBlock(const u8* code_start, const u32 code_size,
u32* host_instructions_count,
u64 starting_pc)
{
if (!m_can_disasm)
return "(No LLVM context)";
u8* disasmPtr = (u8*)code_start;
const u8* end = code_start + code_size;
std::ostringstream x86_disasm;
while ((u8*)disasmPtr < end)
{
char inst_disasm[256];
size_t inst_size = LLVMDisasmInstruction(m_llvm_context, disasmPtr, (u64)(end - disasmPtr),
starting_pc, inst_disasm, 256);
x86_disasm << "0x" << std::hex << starting_pc << "\t";
if (!inst_size)
{
x86_disasm << "Invalid inst:";
if (m_instruction_size != -1)
{
// If we are on an architecture that has a fixed instruction size
// We can continue onward past this bad instruction.
std::string inst_str;
for (int i = 0; i < m_instruction_size; ++i)
inst_str += fmt::format("{:02x}", disasmPtr[i]);
x86_disasm << inst_str << std::endl;
disasmPtr += m_instruction_size;
}
else
{
// We can't continue if we are on an architecture that has flexible instruction sizes
// Dump the rest of the block instead
std::string code_block;
for (int i = 0; (disasmPtr + i) < end; ++i)
code_block += fmt::format("{:02x}", disasmPtr[i]);
x86_disasm << code_block << std::endl;
break;
}
}
else
{
x86_disasm << inst_disasm << std::endl;
disasmPtr += inst_size;
starting_pc += inst_size;
}
(*host_instructions_count)++;
}
return x86_disasm.str();
}
#elif defined(_M_X86)
class HostDisassemblerX86 : public HostDisassembler
{
public:
HostDisassemblerX86();
private:
disassembler m_disasm;
std::string DisassembleHostBlock(const u8* code_start, const u32 code_size,
u32* host_instructions_count, u64 starting_pc) override;
};
HostDisassemblerX86::HostDisassemblerX86()
{
m_disasm.set_syntax_intel();
}
std::string HostDisassemblerX86::DisassembleHostBlock(const u8* code_start, const u32 code_size,
u32* host_instructions_count, u64 starting_pc)
{
u64 disasmPtr = (u64)code_start;
const u8* end = code_start + code_size;
std::ostringstream x86_disasm;
while ((u8*)disasmPtr < end)
{
char inst_disasm[256];
disasmPtr += m_disasm.disasm64(disasmPtr, disasmPtr, (u8*)disasmPtr, inst_disasm);
x86_disasm << inst_disasm << std::endl;
(*host_instructions_count)++;
}
return x86_disasm.str();
}
#endif
std::unique_ptr<HostDisassembler> GetNewDisassembler(const std::string& arch)
{
#if defined(HAVE_LLVM)
if (arch == "x86")
return std::make_unique<HostDisassemblerLLVM>("x86_64-none-unknown");
if (arch == "aarch64")
return std::make_unique<HostDisassemblerLLVM>("aarch64-none-unknown", 4, "cortex-a57");
if (arch == "armv7")
return std::make_unique<HostDisassemblerLLVM>("armv7-none-unknown", 4, "cortex-a15");
#elif defined(_M_X86)
if (arch == "x86")
return std::make_unique<HostDisassemblerX86>();
#endif
return std::make_unique<HostDisassembler>();
}
DisassembleResult DisassembleBlock(HostDisassembler* disasm, u32 address)
{
auto res = Core::System::GetInstance().GetJitInterface().GetHostCode(address);
return std::visit(overloaded{[&](JitInterface::GetHostCodeError error) {
DisassembleResult result;
switch (error)
{
case JitInterface::GetHostCodeError::NoJitActive:
result.text = "(No JIT active)";
break;
case JitInterface::GetHostCodeError::NoTranslation:
result.text = "(No translation)";
break;
default:
ASSERT(false);
break;
}
result.entry_address = address;
result.instruction_count = 0;
result.code_size = 0;
return result;
},
[&](JitInterface::GetHostCodeResult host_result) {
DisassembleResult new_result;
u32 instruction_count = 0;
new_result.text = disasm->DisassembleHostBlock(
host_result.code, host_result.code_size, &instruction_count,
(u64)host_result.code);
new_result.entry_address = host_result.entry_address;
new_result.code_size = host_result.code_size;
new_result.instruction_count = instruction_count;
return new_result;
}},
res);
}
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