MachO file loader and execution utility.
Add a bone-simple utility to load a MachO object into memory, look for a function (main) in it, and run that function directly. This will be used as a test and development platform for MC-JIT work regarding symbol resolution, dynamic lookup, etc.. Code by Daniel Dunbar. llvm-svn: 127885
This commit is contained in:
Jim Grosbach
parent
1c4b42d00f
commit
0072cdbc50
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@ -38,6 +38,7 @@ add_subdirectory(llvm-extract)
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add_subdirectory(llvm-diff)
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add_subdirectory(macho-dump)
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add_subdirectory(llvm-objdump)
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add_subdirectory(llvm-rtdyld)
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add_subdirectory(bugpoint)
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add_subdirectory(bugpoint-passes)
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@ -13,19 +13,20 @@ LEVEL := ..
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OPTIONAL_PARALLEL_DIRS := clang
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# Build LLDB if present. Note LLDB must be built last as it depends on the
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# wider LLVM infrastructure (including Clang).
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# wider LLVM infrastructure (including Clang).
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OPTIONAL_DIRS := lldb
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# NOTE: The tools are organized into five groups of four consisting of one
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# large and three small executables. This is done to minimize memory load
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# in parallel builds. Please retain this ordering.
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DIRS := llvm-config
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DIRS := llvm-config
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PARALLEL_DIRS := opt llvm-as llvm-dis \
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llc llvm-ranlib llvm-ar llvm-nm \
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llvm-ld llvm-prof llvm-link \
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lli llvm-extract llvm-mc \
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bugpoint llvm-bcanalyzer llvm-stub \
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llvmc llvm-diff macho-dump llvm-objdump
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llvmc llvm-diff macho-dump llvm-objdump \
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llvm-rtdyld
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# Let users override the set of tools to build from the command line.
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ifdef ONLY_TOOLS
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@ -0,0 +1,5 @@
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set(LLVM_LINK_COMPONENTS ${LLVM_TARGETS_TO_BUILD} support MC)
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add_llvm_tool(llvm-rtdyld
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llvm-rtdyld.cpp
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)
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@ -0,0 +1,23 @@
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##===- tools/llvm-rtdyld/Makefile --------------------------*- Makefile -*-===##
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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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LEVEL = ../..
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TOOLNAME = llvm-rtdyld
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# This tool has no plugins, optimize startup time.
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TOOL_NO_EXPORTS = 1
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# Include this here so we can get the configuration of the targets
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# that have been configured for construction. We have to do this
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# early so we can set up LINK_COMPONENTS before including Makefile.rules
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include $(LEVEL)/Makefile.config
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LINK_COMPONENTS := $(TARGETS_TO_BUILD) support MC object
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include $(LLVM_SRC_ROOT)/Makefile.rules
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@ -0,0 +1,231 @@
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//===-- llvm-rtdyld.cpp - MCJIT Testing Tool ------------------------------===//
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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 is a testing tool for use with the MC-JIT LLVM components.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/ADT/StringMap.h"
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#include "llvm/ADT/OwningPtr.h"
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#include "llvm/Object/MachOObject.h"
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#include "llvm/Support/CommandLine.h"
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#include "llvm/Support/ManagedStatic.h"
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#include "llvm/Support/Memory.h"
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#include "llvm/Support/MemoryBuffer.h"
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#include "llvm/Support/raw_ostream.h"
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#include "llvm/Support/system_error.h"
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using namespace llvm;
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using namespace llvm::object;
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static cl::opt<std::string>
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InputFile(cl::Positional, cl::desc("<input file>"), cl::init("-"));
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enum ActionType {
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AC_Execute
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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_Execute),
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cl::values(clEnumValN(AC_Execute, "execute",
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"Load, link, and execute the inputs."),
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clEnumValEnd));
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/* *** */
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static const char *ProgramName;
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static void Message(const char *Type, const Twine &Msg) {
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errs() << ProgramName << ": " << Type << ": " << Msg << "\n";
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}
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static int Error(const Twine &Msg) {
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Message("error", Msg);
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return 1;
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}
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/* *** */
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static int ExecuteInput() {
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// Load the input memory buffer.
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OwningPtr<MemoryBuffer> InputBuffer;
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if (error_code ec = MemoryBuffer::getFileOrSTDIN(InputFile, InputBuffer))
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return Error("unable to read input: '" + ec.message() + "'");
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// Load the Mach-O wrapper object.
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std::string ErrorStr;
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OwningPtr<MachOObject> Obj(
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MachOObject::LoadFromBuffer(InputBuffer.take(), &ErrorStr));
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if (!Obj)
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return Error("unable to load object: '" + ErrorStr + "'");
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// Validate that the load commands match what we expect.
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const MachOObject::LoadCommandInfo *SegmentLCI = 0, *SymtabLCI = 0,
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*DysymtabLCI = 0;
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for (unsigned i = 0; i != Obj->getHeader().NumLoadCommands; ++i) {
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const MachOObject::LoadCommandInfo &LCI = Obj->getLoadCommandInfo(i);
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switch (LCI.Command.Type) {
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case macho::LCT_Segment:
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case macho::LCT_Segment64:
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if (SegmentLCI)
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return Error("unexpected input object (multiple segments)");
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SegmentLCI = &LCI;
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break;
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case macho::LCT_Symtab:
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if (SymtabLCI)
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return Error("unexpected input object (multiple symbol tables)");
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SymtabLCI = &LCI;
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break;
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case macho::LCT_Dysymtab:
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if (DysymtabLCI)
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return Error("unexpected input object (multiple symbol tables)");
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DysymtabLCI = &LCI;
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break;
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default:
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return Error("unexpected input object (unexpected load command");
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}
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}
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if (!SymtabLCI)
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return Error("no symbol table found in object");
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if (!SegmentLCI)
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return Error("no symbol table found in object");
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// Read and register the symbol table data.
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InMemoryStruct<macho::SymtabLoadCommand> SymtabLC;
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Obj->ReadSymtabLoadCommand(*SymtabLCI, SymtabLC);
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if (!SymtabLC)
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return Error("unable to load symbol table load command");
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Obj->RegisterStringTable(*SymtabLC);
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// Read the dynamic link-edit information, if present (not present in static
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// objects).
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if (DysymtabLCI) {
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InMemoryStruct<macho::DysymtabLoadCommand> DysymtabLC;
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Obj->ReadDysymtabLoadCommand(*DysymtabLCI, DysymtabLC);
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if (!DysymtabLC)
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return Error("unable to load dynamic link-exit load command");
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// FIXME: We don't support anything interesting yet.
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if (DysymtabLC->LocalSymbolsIndex != 0)
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return Error("NOT YET IMPLEMENTED: local symbol entries");
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if (DysymtabLC->ExternalSymbolsIndex != 0)
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return Error("NOT YET IMPLEMENTED: non-external symbol entries");
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if (DysymtabLC->UndefinedSymbolsIndex != SymtabLC->NumSymbolTableEntries)
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return Error("NOT YET IMPLEMENTED: undefined symbol entries");
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}
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// Load the segment load command.
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if (SegmentLCI->Command.Type != macho::LCT_Segment64)
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return Error("Segment32 not yet implemented!");
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InMemoryStruct<macho::Segment64LoadCommand> Segment64LC;
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Obj->ReadSegment64LoadCommand(*SegmentLCI, Segment64LC);
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if (!Segment64LC)
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return Error("unable to load segment load command");
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// Map the segment into memory.
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sys::MemoryBlock Data = sys::Memory::AllocateRWX(Segment64LC->VMSize,
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0, &ErrorStr);
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if (!Data.base())
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return Error("unable to allocate memory block: '" + ErrorStr + "'");
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memcpy(Data.base(), Obj->getData(Segment64LC->FileOffset,
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Segment64LC->FileSize).data(),
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Segment64LC->FileSize);
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memset((char*)Data.base() + Segment64LC->FileSize, 0,
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Segment64LC->VMSize - Segment64LC->FileSize);
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// Bind the section indices to address.
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void **SectionBases = new void*[Segment64LC->NumSections];
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for (unsigned i = 0; i != Segment64LC->NumSections; ++i) {
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InMemoryStruct<macho::Section64> Sect;
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Obj->ReadSection64(*SegmentLCI, i, Sect);
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if (!Sect)
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return Error("unable to load section: '" + Twine(i) + "'");
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// FIXME: We don't support relocations yet.
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if (Sect->NumRelocationTableEntries != 0)
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return Error("not yet implemented: relocations!");
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// FIXME: Improve check.
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if (Sect->Flags != 0x80000400)
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return Error("unsupported section type!");
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SectionBases[i] = (char*) Data.base() + Sect->Address;
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}
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// Bind all the symbols to address.
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StringMap<void*> SymbolTable;
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for (unsigned i = 0; i != SymtabLC->NumSymbolTableEntries; ++i) {
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InMemoryStruct<macho::Symbol64TableEntry> STE;
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Obj->ReadSymbol64TableEntry(SymtabLC->SymbolTableOffset, i, STE);
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if (!STE)
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return Error("unable to read symbol: '" + Twine(i) + "'");
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if (STE->SectionIndex == 0)
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return Error("unexpected undefined symbol!");
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unsigned Index = STE->SectionIndex - 1;
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if (Index >= Segment64LC->NumSections)
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return Error("invalid section index for symbol: '" + Twine() + "'");
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// Get the symbol name.
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StringRef Name = Obj->getStringAtIndex(STE->StringIndex);
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// Get the section base address.
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void *SectionBase = SectionBases[Index];
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// Get the symbol address.
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void *Address = (char*) SectionBase + STE->Value;
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// FIXME: Check the symbol type and flags.
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if (STE->Type != 0xF)
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return Error("unexpected symbol type!");
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if (STE->Flags != 0x0)
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return Error("unexpected symbol type!");
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SymbolTable[Name] = Address;
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}
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// Get the address of "_main".
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StringMap<void*>::iterator it = SymbolTable.find("_main");
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if (it == SymbolTable.end())
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return Error("no definition for '_main'");
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// Invalidate the instruction cache.
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sys::Memory::InvalidateInstructionCache(Data.base(), Data.size());
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// Make sure the memory is executable.
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if (!sys::Memory::setExecutable(Data, &ErrorStr))
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return Error("unable to mark function executable: '" + ErrorStr + "'");
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// Dispatch to _main().
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void *MainAddress = it->second;
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errs() << "loaded '_main' at: " << MainAddress << "\n";
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int (*Main)(int, const char**) =
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(int(*)(int,const char**)) uintptr_t(MainAddress);
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const char **Argv = new const char*[2];
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Argv[0] = InputFile.c_str();
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Argv[1] = 0;
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return Main(1, Argv);
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}
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int main(int argc, char **argv) {
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ProgramName = argv[0];
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llvm_shutdown_obj Y; // Call llvm_shutdown() on exit.
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cl::ParseCommandLineOptions(argc, argv, "llvm MC-JIT tool\n");
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switch (Action) {
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default:
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case AC_Execute:
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return ExecuteInput();
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}
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return 0;
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}
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