636 lines
21 KiB
C++
636 lines
21 KiB
C++
//===-- llvm-mc.cpp - Machine Code Hacking Driver ---------------*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This utility is a simple driver that allows command line hacking on machine
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// code.
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//
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//===----------------------------------------------------------------------===//
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#include "Disassembler.h"
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#include "llvm/MC/MCAsmBackend.h"
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#include "llvm/MC/MCAsmInfo.h"
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#include "llvm/MC/MCContext.h"
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#include "llvm/MC/MCInstPrinter.h"
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#include "llvm/MC/MCInstrInfo.h"
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#include "llvm/MC/MCObjectFileInfo.h"
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#include "llvm/MC/MCParser/AsmLexer.h"
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#include "llvm/MC/MCParser/MCTargetAsmParser.h"
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#include "llvm/MC/MCRegisterInfo.h"
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#include "llvm/MC/MCSectionMachO.h"
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#include "llvm/MC/MCStreamer.h"
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#include "llvm/MC/MCSubtargetInfo.h"
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#include "llvm/MC/MCTargetOptionsCommandFlags.h"
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#include "llvm/Support/CommandLine.h"
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#include "llvm/Support/Compression.h"
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#include "llvm/Support/FileUtilities.h"
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#include "llvm/Support/FormattedStream.h"
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#include "llvm/Support/Host.h"
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#include "llvm/Support/ManagedStatic.h"
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#include "llvm/Support/MemoryBuffer.h"
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#include "llvm/Support/PrettyStackTrace.h"
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#include "llvm/Support/Signals.h"
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#include "llvm/Support/SourceMgr.h"
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#include "llvm/Support/TargetRegistry.h"
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#include "llvm/Support/TargetSelect.h"
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#include "llvm/Support/ToolOutputFile.h"
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using namespace llvm;
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static cl::opt<std::string>
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InputFilename(cl::Positional, cl::desc("<input file>"), cl::init("-"));
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static cl::opt<std::string>
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OutputFilename("o", cl::desc("Output filename"),
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cl::value_desc("filename"));
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static cl::opt<bool>
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ShowEncoding("show-encoding", cl::desc("Show instruction encodings"));
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static cl::opt<bool> RelaxELFRel(
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"relax-relocations", cl::init(true),
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cl::desc("Emit R_X86_64_GOTPCRELX instead of R_X86_64_GOTPCREL"));
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static cl::opt<DebugCompressionType>
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CompressDebugSections("compress-debug-sections", cl::ValueOptional,
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cl::init(DebugCompressionType::DCT_None),
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cl::desc("Choose DWARF debug sections compression:"),
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cl::values(
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clEnumValN(DebugCompressionType::DCT_None, "none",
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"No compression"),
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clEnumValN(DebugCompressionType::DCT_Zlib, "zlib",
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"Use zlib compression"),
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clEnumValN(DebugCompressionType::DCT_ZlibGnu, "zlib-gnu",
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"Use zlib-gnu compression (depricated)"),
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clEnumValEnd));
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static cl::opt<bool>
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ShowInst("show-inst", cl::desc("Show internal instruction representation"));
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static cl::opt<bool>
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ShowInstOperands("show-inst-operands",
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cl::desc("Show instructions operands as parsed"));
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static cl::opt<unsigned>
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OutputAsmVariant("output-asm-variant",
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cl::desc("Syntax variant to use for output printing"));
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static cl::opt<bool>
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PrintImmHex("print-imm-hex", cl::init(false),
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cl::desc("Prefer hex format for immediate values"));
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static cl::list<std::string>
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DefineSymbol("defsym", cl::desc("Defines a symbol to be an integer constant"));
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static cl::opt<bool>
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PreserveComments("preserve-comments",
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cl::desc("Preserve Comments in outputted assembly"));
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enum OutputFileType {
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OFT_Null,
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OFT_AssemblyFile,
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OFT_ObjectFile
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};
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static cl::opt<OutputFileType>
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FileType("filetype", cl::init(OFT_AssemblyFile),
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cl::desc("Choose an output file type:"),
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cl::values(
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clEnumValN(OFT_AssemblyFile, "asm",
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"Emit an assembly ('.s') file"),
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clEnumValN(OFT_Null, "null",
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"Don't emit anything (for timing purposes)"),
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clEnumValN(OFT_ObjectFile, "obj",
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"Emit a native object ('.o') file"),
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clEnumValEnd));
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static cl::list<std::string>
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IncludeDirs("I", cl::desc("Directory of include files"),
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cl::value_desc("directory"), cl::Prefix);
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static cl::opt<std::string>
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ArchName("arch", cl::desc("Target arch to assemble for, "
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"see -version for available targets"));
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static cl::opt<std::string>
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TripleName("triple", cl::desc("Target triple to assemble for, "
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"see -version for available targets"));
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static cl::opt<std::string>
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MCPU("mcpu",
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cl::desc("Target a specific cpu type (-mcpu=help for details)"),
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cl::value_desc("cpu-name"),
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cl::init(""));
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static cl::list<std::string>
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MAttrs("mattr",
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cl::CommaSeparated,
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cl::desc("Target specific attributes (-mattr=help for details)"),
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cl::value_desc("a1,+a2,-a3,..."));
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static cl::opt<bool> PIC("position-independent",
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cl::desc("Position independent"), cl::init(false));
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static cl::opt<llvm::CodeModel::Model>
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CMModel("code-model",
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cl::desc("Choose code model"),
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cl::init(CodeModel::Default),
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cl::values(clEnumValN(CodeModel::Default, "default",
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"Target default code model"),
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clEnumValN(CodeModel::Small, "small",
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"Small code model"),
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clEnumValN(CodeModel::Kernel, "kernel",
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"Kernel code model"),
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clEnumValN(CodeModel::Medium, "medium",
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"Medium code model"),
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clEnumValN(CodeModel::Large, "large",
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"Large code model"),
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clEnumValEnd));
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static cl::opt<bool>
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NoInitialTextSection("n", cl::desc("Don't assume assembly file starts "
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"in the text section"));
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static cl::opt<bool>
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GenDwarfForAssembly("g", cl::desc("Generate dwarf debugging info for assembly "
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"source files"));
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static cl::opt<std::string>
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DebugCompilationDir("fdebug-compilation-dir",
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cl::desc("Specifies the debug info's compilation dir"));
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static cl::opt<std::string>
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MainFileName("main-file-name",
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cl::desc("Specifies the name we should consider the input file"));
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static cl::opt<bool> SaveTempLabels("save-temp-labels",
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cl::desc("Don't discard temporary labels"));
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static cl::opt<bool> NoExecStack("no-exec-stack",
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cl::desc("File doesn't need an exec stack"));
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enum ActionType {
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AC_AsLex,
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AC_Assemble,
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AC_Disassemble,
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AC_MDisassemble,
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};
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static cl::opt<ActionType>
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Action(cl::desc("Action to perform:"),
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cl::init(AC_Assemble),
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cl::values(clEnumValN(AC_AsLex, "as-lex",
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"Lex tokens from a .s file"),
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clEnumValN(AC_Assemble, "assemble",
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"Assemble a .s file (default)"),
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clEnumValN(AC_Disassemble, "disassemble",
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"Disassemble strings of hex bytes"),
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clEnumValN(AC_MDisassemble, "mdis",
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"Marked up disassembly of strings of hex bytes"),
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clEnumValEnd));
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static const Target *GetTarget(const char *ProgName) {
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// Figure out the target triple.
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if (TripleName.empty())
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TripleName = sys::getDefaultTargetTriple();
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Triple TheTriple(Triple::normalize(TripleName));
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// Get the target specific parser.
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std::string Error;
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const Target *TheTarget = TargetRegistry::lookupTarget(ArchName, TheTriple,
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Error);
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if (!TheTarget) {
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errs() << ProgName << ": " << Error;
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return nullptr;
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}
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// Update the triple name and return the found target.
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TripleName = TheTriple.getTriple();
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return TheTarget;
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}
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static std::unique_ptr<tool_output_file> GetOutputStream() {
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if (OutputFilename == "")
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OutputFilename = "-";
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std::error_code EC;
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auto Out = llvm::make_unique<tool_output_file>(OutputFilename, EC,
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sys::fs::F_None);
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if (EC) {
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errs() << EC.message() << '\n';
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return nullptr;
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}
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return Out;
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}
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static std::string DwarfDebugFlags;
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static void setDwarfDebugFlags(int argc, char **argv) {
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if (!getenv("RC_DEBUG_OPTIONS"))
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return;
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for (int i = 0; i < argc; i++) {
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DwarfDebugFlags += argv[i];
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if (i + 1 < argc)
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DwarfDebugFlags += " ";
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}
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}
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static std::string DwarfDebugProducer;
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static void setDwarfDebugProducer() {
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if(!getenv("DEBUG_PRODUCER"))
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return;
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DwarfDebugProducer += getenv("DEBUG_PRODUCER");
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}
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static int AsLexInput(SourceMgr &SrcMgr, MCAsmInfo &MAI,
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raw_ostream &OS) {
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AsmLexer Lexer(MAI);
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Lexer.setBuffer(SrcMgr.getMemoryBuffer(SrcMgr.getMainFileID())->getBuffer());
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bool Error = false;
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while (Lexer.Lex().isNot(AsmToken::Eof)) {
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const AsmToken &Tok = Lexer.getTok();
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switch (Tok.getKind()) {
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default:
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SrcMgr.PrintMessage(Lexer.getLoc(), SourceMgr::DK_Warning,
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"unknown token");
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Error = true;
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break;
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case AsmToken::Error:
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Error = true; // error already printed.
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break;
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case AsmToken::Identifier:
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OS << "identifier: " << Lexer.getTok().getString();
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break;
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case AsmToken::Integer:
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OS << "int: " << Lexer.getTok().getString();
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break;
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case AsmToken::Real:
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OS << "real: " << Lexer.getTok().getString();
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break;
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case AsmToken::String:
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OS << "string: " << Lexer.getTok().getString();
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break;
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case AsmToken::Amp: OS << "Amp"; break;
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case AsmToken::AmpAmp: OS << "AmpAmp"; break;
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case AsmToken::At: OS << "At"; break;
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case AsmToken::Caret: OS << "Caret"; break;
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case AsmToken::Colon: OS << "Colon"; break;
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case AsmToken::Comma: OS << "Comma"; break;
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case AsmToken::Dollar: OS << "Dollar"; break;
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case AsmToken::Dot: OS << "Dot"; break;
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case AsmToken::EndOfStatement: OS << "EndOfStatement"; break;
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case AsmToken::Eof: OS << "Eof"; break;
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case AsmToken::Equal: OS << "Equal"; break;
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case AsmToken::EqualEqual: OS << "EqualEqual"; break;
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case AsmToken::Exclaim: OS << "Exclaim"; break;
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case AsmToken::ExclaimEqual: OS << "ExclaimEqual"; break;
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case AsmToken::Greater: OS << "Greater"; break;
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case AsmToken::GreaterEqual: OS << "GreaterEqual"; break;
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case AsmToken::GreaterGreater: OS << "GreaterGreater"; break;
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case AsmToken::Hash: OS << "Hash"; break;
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case AsmToken::LBrac: OS << "LBrac"; break;
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case AsmToken::LCurly: OS << "LCurly"; break;
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case AsmToken::LParen: OS << "LParen"; break;
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case AsmToken::Less: OS << "Less"; break;
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case AsmToken::LessEqual: OS << "LessEqual"; break;
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case AsmToken::LessGreater: OS << "LessGreater"; break;
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case AsmToken::LessLess: OS << "LessLess"; break;
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case AsmToken::Minus: OS << "Minus"; break;
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case AsmToken::Percent: OS << "Percent"; break;
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case AsmToken::Pipe: OS << "Pipe"; break;
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case AsmToken::PipePipe: OS << "PipePipe"; break;
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case AsmToken::Plus: OS << "Plus"; break;
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case AsmToken::RBrac: OS << "RBrac"; break;
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case AsmToken::RCurly: OS << "RCurly"; break;
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case AsmToken::RParen: OS << "RParen"; break;
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case AsmToken::Slash: OS << "Slash"; break;
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case AsmToken::Star: OS << "Star"; break;
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case AsmToken::Tilde: OS << "Tilde"; break;
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case AsmToken::PercentCall16:
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OS << "PercentCall16";
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break;
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case AsmToken::PercentCall_Hi:
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OS << "PercentCall_Hi";
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break;
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case AsmToken::PercentCall_Lo:
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OS << "PercentCall_Lo";
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break;
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case AsmToken::PercentDtprel_Hi:
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OS << "PercentDtprel_Hi";
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break;
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case AsmToken::PercentDtprel_Lo:
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OS << "PercentDtprel_Lo";
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break;
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case AsmToken::PercentGot:
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OS << "PercentGot";
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break;
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case AsmToken::PercentGot_Disp:
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OS << "PercentGot_Disp";
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break;
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case AsmToken::PercentGot_Hi:
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OS << "PercentGot_Hi";
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break;
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case AsmToken::PercentGot_Lo:
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OS << "PercentGot_Lo";
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break;
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case AsmToken::PercentGot_Ofst:
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OS << "PercentGot_Ofst";
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break;
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case AsmToken::PercentGot_Page:
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OS << "PercentGot_Page";
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break;
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case AsmToken::PercentGottprel:
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OS << "PercentGottprel";
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break;
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case AsmToken::PercentGp_Rel:
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OS << "PercentGp_Rel";
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break;
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case AsmToken::PercentHi:
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OS << "PercentHi";
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break;
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case AsmToken::PercentHigher:
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OS << "PercentHigher";
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break;
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case AsmToken::PercentHighest:
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OS << "PercentHighest";
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break;
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case AsmToken::PercentLo:
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OS << "PercentLo";
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break;
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case AsmToken::PercentNeg:
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OS << "PercentNeg";
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break;
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case AsmToken::PercentPcrel_Hi:
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OS << "PercentPcrel_Hi";
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break;
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case AsmToken::PercentPcrel_Lo:
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OS << "PercentPcrel_Lo";
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break;
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case AsmToken::PercentTlsgd:
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OS << "PercentTlsgd";
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break;
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case AsmToken::PercentTlsldm:
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OS << "PercentTlsldm";
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break;
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case AsmToken::PercentTprel_Hi:
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OS << "PercentTprel_Hi";
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break;
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case AsmToken::PercentTprel_Lo:
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OS << "PercentTprel_Lo";
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break;
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}
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// Print the token string.
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OS << " (\"";
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OS.write_escaped(Tok.getString());
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OS << "\")\n";
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}
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return Error;
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}
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static int fillCommandLineSymbols(MCAsmParser &Parser){
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for(auto &I: DefineSymbol){
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auto Pair = StringRef(I).split('=');
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if(Pair.second.empty()){
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errs() << "error: defsym must be of the form: sym=value: " << I;
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return 1;
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}
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int64_t Value;
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if(Pair.second.getAsInteger(0, Value)){
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errs() << "error: Value is not an integer: " << Pair.second;
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return 1;
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}
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auto &Context = Parser.getContext();
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auto Symbol = Context.getOrCreateSymbol(Pair.first);
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Parser.getStreamer().EmitAssignment(Symbol,
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MCConstantExpr::create(Value, Context));
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}
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return 0;
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}
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static int AssembleInput(const char *ProgName, const Target *TheTarget,
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SourceMgr &SrcMgr, MCContext &Ctx, MCStreamer &Str,
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MCAsmInfo &MAI, MCSubtargetInfo &STI,
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MCInstrInfo &MCII, MCTargetOptions &MCOptions) {
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std::unique_ptr<MCAsmParser> Parser(
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createMCAsmParser(SrcMgr, Ctx, Str, MAI));
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std::unique_ptr<MCTargetAsmParser> TAP(
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TheTarget->createMCAsmParser(STI, *Parser, MCII, MCOptions));
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if (!TAP) {
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errs() << ProgName
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<< ": error: this target does not support assembly parsing.\n";
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return 1;
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}
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int SymbolResult = fillCommandLineSymbols(*Parser);
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if(SymbolResult)
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return SymbolResult;
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Parser->setShowParsedOperands(ShowInstOperands);
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Parser->setTargetParser(*TAP);
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int Res = Parser->Run(NoInitialTextSection);
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return Res;
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}
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int main(int argc, char **argv) {
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// Print a stack trace if we signal out.
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sys::PrintStackTraceOnErrorSignal(argv[0]);
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PrettyStackTraceProgram X(argc, argv);
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llvm_shutdown_obj Y; // Call llvm_shutdown() on exit.
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// Initialize targets and assembly printers/parsers.
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llvm::InitializeAllTargetInfos();
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llvm::InitializeAllTargetMCs();
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llvm::InitializeAllAsmParsers();
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llvm::InitializeAllDisassemblers();
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// Register the target printer for --version.
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cl::AddExtraVersionPrinter(TargetRegistry::printRegisteredTargetsForVersion);
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cl::ParseCommandLineOptions(argc, argv, "llvm machine code playground\n");
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MCTargetOptions MCOptions = InitMCTargetOptionsFromFlags();
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TripleName = Triple::normalize(TripleName);
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setDwarfDebugFlags(argc, argv);
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setDwarfDebugProducer();
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const char *ProgName = argv[0];
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const Target *TheTarget = GetTarget(ProgName);
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if (!TheTarget)
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return 1;
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// Now that GetTarget() has (potentially) replaced TripleName, it's safe to
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// construct the Triple object.
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Triple TheTriple(TripleName);
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ErrorOr<std::unique_ptr<MemoryBuffer>> BufferPtr =
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MemoryBuffer::getFileOrSTDIN(InputFilename);
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if (std::error_code EC = BufferPtr.getError()) {
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errs() << InputFilename << ": " << EC.message() << '\n';
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return 1;
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}
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MemoryBuffer *Buffer = BufferPtr->get();
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SourceMgr SrcMgr;
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// Tell SrcMgr about this buffer, which is what the parser will pick up.
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SrcMgr.AddNewSourceBuffer(std::move(*BufferPtr), SMLoc());
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// Record the location of the include directories so that the lexer can find
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// it later.
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SrcMgr.setIncludeDirs(IncludeDirs);
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std::unique_ptr<MCRegisterInfo> MRI(TheTarget->createMCRegInfo(TripleName));
|
|
assert(MRI && "Unable to create target register info!");
|
|
|
|
std::unique_ptr<MCAsmInfo> MAI(TheTarget->createMCAsmInfo(*MRI, TripleName));
|
|
assert(MAI && "Unable to create target asm info!");
|
|
|
|
MAI->setRelaxELFRelocations(RelaxELFRel);
|
|
|
|
if (CompressDebugSections != DebugCompressionType::DCT_None) {
|
|
if (!zlib::isAvailable()) {
|
|
errs() << ProgName
|
|
<< ": build tools with zlib to enable -compress-debug-sections";
|
|
return 1;
|
|
}
|
|
MAI->setCompressDebugSections(CompressDebugSections);
|
|
}
|
|
MAI->setPreserveAsmComments(PreserveComments);
|
|
|
|
// FIXME: This is not pretty. MCContext has a ptr to MCObjectFileInfo and
|
|
// MCObjectFileInfo needs a MCContext reference in order to initialize itself.
|
|
MCObjectFileInfo MOFI;
|
|
MCContext Ctx(MAI.get(), MRI.get(), &MOFI, &SrcMgr);
|
|
MOFI.InitMCObjectFileInfo(TheTriple, PIC, CMModel, Ctx);
|
|
|
|
if (SaveTempLabels)
|
|
Ctx.setAllowTemporaryLabels(false);
|
|
|
|
Ctx.setGenDwarfForAssembly(GenDwarfForAssembly);
|
|
// Default to 4 for dwarf version.
|
|
unsigned DwarfVersion = MCOptions.DwarfVersion ? MCOptions.DwarfVersion : 4;
|
|
if (DwarfVersion < 2 || DwarfVersion > 4) {
|
|
errs() << ProgName << ": Dwarf version " << DwarfVersion
|
|
<< " is not supported." << '\n';
|
|
return 1;
|
|
}
|
|
Ctx.setDwarfVersion(DwarfVersion);
|
|
if (!DwarfDebugFlags.empty())
|
|
Ctx.setDwarfDebugFlags(StringRef(DwarfDebugFlags));
|
|
if (!DwarfDebugProducer.empty())
|
|
Ctx.setDwarfDebugProducer(StringRef(DwarfDebugProducer));
|
|
if (!DebugCompilationDir.empty())
|
|
Ctx.setCompilationDir(DebugCompilationDir);
|
|
else {
|
|
// If no compilation dir is set, try to use the current directory.
|
|
SmallString<128> CWD;
|
|
if (!sys::fs::current_path(CWD))
|
|
Ctx.setCompilationDir(CWD);
|
|
}
|
|
if (!MainFileName.empty())
|
|
Ctx.setMainFileName(MainFileName);
|
|
|
|
// Package up features to be passed to target/subtarget
|
|
std::string FeaturesStr;
|
|
if (MAttrs.size()) {
|
|
SubtargetFeatures Features;
|
|
for (unsigned i = 0; i != MAttrs.size(); ++i)
|
|
Features.AddFeature(MAttrs[i]);
|
|
FeaturesStr = Features.getString();
|
|
}
|
|
|
|
std::unique_ptr<tool_output_file> Out = GetOutputStream();
|
|
if (!Out)
|
|
return 1;
|
|
|
|
std::unique_ptr<buffer_ostream> BOS;
|
|
raw_pwrite_stream *OS = &Out->os();
|
|
std::unique_ptr<MCStreamer> Str;
|
|
|
|
std::unique_ptr<MCInstrInfo> MCII(TheTarget->createMCInstrInfo());
|
|
std::unique_ptr<MCSubtargetInfo> STI(
|
|
TheTarget->createMCSubtargetInfo(TripleName, MCPU, FeaturesStr));
|
|
|
|
MCInstPrinter *IP = nullptr;
|
|
if (FileType == OFT_AssemblyFile) {
|
|
IP = TheTarget->createMCInstPrinter(Triple(TripleName), OutputAsmVariant,
|
|
*MAI, *MCII, *MRI);
|
|
|
|
// Set the display preference for hex vs. decimal immediates.
|
|
IP->setPrintImmHex(PrintImmHex);
|
|
|
|
// Set up the AsmStreamer.
|
|
MCCodeEmitter *CE = nullptr;
|
|
MCAsmBackend *MAB = nullptr;
|
|
if (ShowEncoding) {
|
|
CE = TheTarget->createMCCodeEmitter(*MCII, *MRI, Ctx);
|
|
MAB = TheTarget->createMCAsmBackend(*MRI, TripleName, MCPU, MCOptions);
|
|
}
|
|
auto FOut = llvm::make_unique<formatted_raw_ostream>(*OS);
|
|
Str.reset(TheTarget->createAsmStreamer(
|
|
Ctx, std::move(FOut), /*asmverbose*/ true,
|
|
/*useDwarfDirectory*/ true, IP, CE, MAB, ShowInst));
|
|
|
|
} else if (FileType == OFT_Null) {
|
|
Str.reset(TheTarget->createNullStreamer(Ctx));
|
|
} else {
|
|
assert(FileType == OFT_ObjectFile && "Invalid file type!");
|
|
|
|
// Don't waste memory on names of temp labels.
|
|
Ctx.setUseNamesOnTempLabels(false);
|
|
|
|
if (!Out->os().supportsSeeking()) {
|
|
BOS = make_unique<buffer_ostream>(Out->os());
|
|
OS = BOS.get();
|
|
}
|
|
|
|
MCCodeEmitter *CE = TheTarget->createMCCodeEmitter(*MCII, *MRI, Ctx);
|
|
MCAsmBackend *MAB = TheTarget->createMCAsmBackend(*MRI, TripleName, MCPU,
|
|
MCOptions);
|
|
Str.reset(TheTarget->createMCObjectStreamer(
|
|
TheTriple, Ctx, *MAB, *OS, CE, *STI, MCOptions.MCRelaxAll,
|
|
MCOptions.MCIncrementalLinkerCompatible,
|
|
/*DWARFMustBeAtTheEnd*/ false));
|
|
if (NoExecStack)
|
|
Str->InitSections(true);
|
|
}
|
|
|
|
int Res = 1;
|
|
bool disassemble = false;
|
|
switch (Action) {
|
|
case AC_AsLex:
|
|
Res = AsLexInput(SrcMgr, *MAI, Out->os());
|
|
break;
|
|
case AC_Assemble:
|
|
Res = AssembleInput(ProgName, TheTarget, SrcMgr, Ctx, *Str, *MAI, *STI,
|
|
*MCII, MCOptions);
|
|
break;
|
|
case AC_MDisassemble:
|
|
assert(IP && "Expected assembly output");
|
|
IP->setUseMarkup(1);
|
|
disassemble = true;
|
|
break;
|
|
case AC_Disassemble:
|
|
disassemble = true;
|
|
break;
|
|
}
|
|
if (disassemble)
|
|
Res = Disassembler::disassemble(*TheTarget, TripleName, *STI, *Str,
|
|
*Buffer, SrcMgr, Out->os());
|
|
|
|
// Keep output if no errors.
|
|
if (Res == 0) Out->keep();
|
|
return Res;
|
|
}
|