2011-03-21 22:15:52 +00:00
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//===-- RuntimeDyld.h - Run-time dynamic linker for MC-JIT ------*- 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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// Implementation of the MC-JIT runtime dynamic linker.
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//
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//===----------------------------------------------------------------------===//
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2011-03-23 19:52:00 +00:00
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#define DEBUG_TYPE "dyld"
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2011-03-21 22:15:52 +00:00
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#include "llvm/ADT/OwningPtr.h"
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2011-03-23 19:52:00 +00:00
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#include "llvm/ADT/SmallVector.h"
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2011-03-21 22:15:52 +00:00
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#include "llvm/ADT/StringMap.h"
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#include "llvm/ADT/StringRef.h"
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#include "llvm/ADT/Twine.h"
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#include "llvm/ExecutionEngine/RuntimeDyld.h"
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2011-03-29 21:03:05 +00:00
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#include "llvm/ExecutionEngine/JITMemoryManager.h"
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2011-03-21 22:15:52 +00:00
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#include "llvm/Object/MachOObject.h"
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2011-03-23 19:52:00 +00:00
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#include "llvm/Support/Debug.h"
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#include "llvm/Support/ErrorHandling.h"
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#include "llvm/Support/Format.h"
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2011-03-21 22:15:52 +00:00
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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/system_error.h"
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2011-03-23 19:52:00 +00:00
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#include "llvm/Support/raw_ostream.h"
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2011-03-21 22:15:52 +00:00
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using namespace llvm;
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using namespace llvm::object;
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namespace llvm {
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class RuntimeDyldImpl {
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2011-03-23 22:06:06 +00:00
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unsigned CPUType;
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unsigned CPUSubtype;
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2011-03-29 21:03:05 +00:00
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// The JITMemoryManager to load objects into.
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JITMemoryManager *JMM;
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2011-03-21 22:15:52 +00:00
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// Master symbol table. As modules are loaded and external symbols are
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// resolved, their addresses are stored here.
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StringMap<void*> SymbolTable;
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// FIXME: Should have multiple data blocks, one for each loaded chunk of
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// compiled code.
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sys::MemoryBlock Data;
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bool HasError;
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std::string ErrorStr;
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// Set the error state and record an error string.
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bool Error(const Twine &Msg) {
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ErrorStr = Msg.str();
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HasError = true;
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return true;
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}
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2011-03-23 19:52:00 +00:00
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bool resolveRelocation(uint32_t BaseSection, macho::RelocationEntry RE,
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SmallVectorImpl<void *> &SectionBases,
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SmallVectorImpl<StringRef> &SymbolNames);
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2011-03-23 22:06:06 +00:00
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bool resolveX86_64Relocation(intptr_t Address, intptr_t Value, bool isPCRel,
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unsigned Type, unsigned Size);
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bool resolveARMRelocation(intptr_t Address, intptr_t Value, bool isPCRel,
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unsigned Type, unsigned Size);
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2011-03-23 19:52:00 +00:00
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2011-03-21 22:15:52 +00:00
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bool loadSegment32(const MachOObject *Obj,
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const MachOObject::LoadCommandInfo *SegmentLCI,
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const InMemoryStruct<macho::SymtabLoadCommand> &SymtabLC);
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bool loadSegment64(const MachOObject *Obj,
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const MachOObject::LoadCommandInfo *SegmentLCI,
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const InMemoryStruct<macho::SymtabLoadCommand> &SymtabLC);
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public:
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2011-03-29 21:03:05 +00:00
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RuntimeDyldImpl(JITMemoryManager *jmm) : JMM(jmm), HasError(false) {}
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2011-03-22 00:42:19 +00:00
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2011-03-21 22:15:52 +00:00
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bool loadObject(MemoryBuffer *InputBuffer);
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void *getSymbolAddress(StringRef Name) {
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// Use lookup() rather than [] because we don't want to add an entry
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// if there isn't one already, which the [] operator does.
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return SymbolTable.lookup(Name);
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}
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sys::MemoryBlock getMemoryBlock() { return Data; }
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// Is the linker in an error state?
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bool hasError() { return HasError; }
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// Mark the error condition as handled and continue.
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void clearError() { HasError = false; }
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// Get the error message.
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StringRef getErrorString() { return ErrorStr; }
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};
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2011-03-23 19:52:00 +00:00
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// FIXME: Relocations for targets other than x86_64.
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bool RuntimeDyldImpl::
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resolveRelocation(uint32_t BaseSection, macho::RelocationEntry RE,
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SmallVectorImpl<void *> &SectionBases,
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SmallVectorImpl<StringRef> &SymbolNames) {
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// struct relocation_info {
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// int32_t r_address;
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// uint32_t r_symbolnum:24,
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// r_pcrel:1,
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// r_length:2,
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// r_extern:1,
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// r_type:4;
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// };
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uint32_t SymbolNum = RE.Word1 & 0xffffff; // 24-bit value
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bool isPCRel = (RE.Word1 >> 24) & 1;
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unsigned Log2Size = (RE.Word1 >> 25) & 3;
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bool isExtern = (RE.Word1 >> 27) & 1;
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unsigned Type = (RE.Word1 >> 28) & 0xf;
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if (RE.Word0 & macho::RF_Scattered)
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return Error("NOT YET IMPLEMENTED: scattered relocations.");
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// The address requiring a relocation.
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intptr_t Address = (intptr_t)SectionBases[BaseSection] + RE.Word0;
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// Figure out the target address of the relocation. If isExtern is true,
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// this relocation references the symbol table, otherwise it references
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// a section in the same object, numbered from 1 through NumSections
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// (SectionBases is [0, NumSections-1]).
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intptr_t Value;
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if (isExtern) {
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StringRef Name = SymbolNames[SymbolNum];
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if (SymbolTable.lookup(Name)) {
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// The symbol is in our symbol table, so we can resolve it directly.
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Value = (intptr_t)SymbolTable[Name];
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} else {
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return Error("NOT YET IMPLEMENTED: relocations to pre-compiled code.");
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}
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DEBUG(dbgs() << "Resolve relocation(" << Type << ") from '" << Name
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<< "' to " << format("0x%x", Address) << ".\n");
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} else {
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// For non-external relocations, the SymbolNum is actual a section number
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// as described above.
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Value = (intptr_t)SectionBases[SymbolNum - 1];
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}
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2011-03-21 22:15:52 +00:00
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2011-03-23 22:06:06 +00:00
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unsigned Size = 1 << Log2Size;
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switch (CPUType) {
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default: assert(0 && "Unsupported CPU type!");
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case mach::CTM_x86_64:
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return resolveX86_64Relocation(Address, Value, isPCRel, Type, Size);
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case mach::CTM_ARM:
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return resolveARMRelocation(Address, Value, isPCRel, Type, Size);
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}
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llvm_unreachable("");
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}
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bool RuntimeDyldImpl::resolveX86_64Relocation(intptr_t Address, intptr_t Value,
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bool isPCRel, unsigned Type,
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unsigned Size) {
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2011-03-23 19:52:00 +00:00
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// If the relocation is PC-relative, the value to be encoded is the
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// pointer difference.
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if (isPCRel)
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// FIXME: It seems this value needs to be adjusted by 4 for an effective PC
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// address. Is that expected? Only for branches, perhaps?
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Value -= Address + 4;
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switch(Type) {
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default:
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llvm_unreachable("Invalid relocation type!");
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case macho::RIT_X86_64_Unsigned:
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case macho::RIT_X86_64_Branch: {
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// Mask in the target value a byte at a time (we don't have an alignment
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// guarantee for the target address, so this is safest).
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uint8_t *p = (uint8_t*)Address;
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2011-03-23 22:06:06 +00:00
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for (unsigned i = 0; i < Size; ++i) {
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2011-03-23 19:52:00 +00:00
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*p++ = (uint8_t)Value;
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Value >>= 8;
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}
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return false;
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}
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case macho::RIT_X86_64_Signed:
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case macho::RIT_X86_64_GOTLoad:
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case macho::RIT_X86_64_GOT:
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case macho::RIT_X86_64_Subtractor:
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case macho::RIT_X86_64_Signed1:
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case macho::RIT_X86_64_Signed2:
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case macho::RIT_X86_64_Signed4:
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case macho::RIT_X86_64_TLV:
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return Error("Relocation type not implemented yet!");
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}
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return false;
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}
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2011-03-21 22:15:52 +00:00
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2011-03-23 22:06:06 +00:00
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bool RuntimeDyldImpl::resolveARMRelocation(intptr_t Address, intptr_t Value,
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bool isPCRel, unsigned Type,
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unsigned Size) {
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// If the relocation is PC-relative, the value to be encoded is the
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// pointer difference.
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if (isPCRel) {
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Value -= Address;
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// ARM PCRel relocations have an effective-PC offset of two instructions
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// (four bytes in Thumb mode, 8 bytes in ARM mode).
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// FIXME: For now, assume ARM mode.
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Value -= 8;
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}
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switch(Type) {
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default:
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case macho::RIT_Vanilla: {
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llvm_unreachable("Invalid relocation type!");
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// Mask in the target value a byte at a time (we don't have an alignment
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// guarantee for the target address, so this is safest).
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uint8_t *p = (uint8_t*)Address;
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for (unsigned i = 0; i < Size; ++i) {
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*p++ = (uint8_t)Value;
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Value >>= 8;
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}
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2011-03-23 23:35:17 +00:00
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break;
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2011-03-23 22:06:06 +00:00
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}
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case macho::RIT_Pair:
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case macho::RIT_Difference:
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case macho::RIT_ARM_LocalDifference:
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case macho::RIT_ARM_PreboundLazyPointer:
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2011-03-23 23:35:17 +00:00
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case macho::RIT_ARM_Branch24Bit: {
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// Mask the value into the target address. We know instructions are
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// 32-bit aligned, so we can do it all at once.
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uint32_t *p = (uint32_t*)Address;
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// The low two bits of the value are not encoded.
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Value >>= 2;
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// Mask the value to 24 bits.
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Value &= 0xffffff;
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// FIXME: If the destination is a Thumb function (and the instruction
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// is a non-predicated BL instruction), we need to change it to a BLX
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// instruction instead.
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// Insert the value into the instruction.
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*p = (*p & ~0xffffff) | Value;
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break;
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}
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2011-03-23 22:06:06 +00:00
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case macho::RIT_ARM_ThumbBranch22Bit:
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case macho::RIT_ARM_ThumbBranch32Bit:
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case macho::RIT_ARM_Half:
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case macho::RIT_ARM_HalfDifference:
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return Error("Relocation type not implemented yet!");
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}
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return false;
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}
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2011-03-21 22:15:52 +00:00
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bool RuntimeDyldImpl::
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loadSegment32(const MachOObject *Obj,
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const MachOObject::LoadCommandInfo *SegmentLCI,
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const InMemoryStruct<macho::SymtabLoadCommand> &SymtabLC) {
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InMemoryStruct<macho::SegmentLoadCommand> Segment32LC;
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Obj->ReadSegmentLoadCommand(*SegmentLCI, Segment32LC);
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if (!Segment32LC)
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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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std::string ErrorStr;
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Data = sys::Memory::AllocateRWX(Segment32LC->VMSize, 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(Segment32LC->FileOffset,
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Segment32LC->FileSize).data(),
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Segment32LC->FileSize);
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memset((char*)Data.base() + Segment32LC->FileSize, 0,
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Segment32LC->VMSize - Segment32LC->FileSize);
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2011-03-23 23:35:17 +00:00
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// Bind the section indices to addresses and record the relocations we
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// need to resolve.
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typedef std::pair<uint32_t, macho::RelocationEntry> RelocationMap;
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SmallVector<RelocationMap, 64> Relocations;
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2011-03-23 19:52:00 +00:00
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SmallVector<void *, 16> SectionBases;
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2011-03-21 22:15:52 +00:00
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for (unsigned i = 0; i != Segment32LC->NumSections; ++i) {
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InMemoryStruct<macho::Section> Sect;
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Obj->ReadSection(*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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2011-03-23 23:35:17 +00:00
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// Remember any relocations the section has so we can resolve them later.
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for (unsigned j = 0; j != Sect->NumRelocationTableEntries; ++j) {
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InMemoryStruct<macho::RelocationEntry> RE;
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Obj->ReadRelocationEntry(Sect->RelocationTableOffset, j, RE);
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Relocations.push_back(RelocationMap(j, *RE));
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}
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2011-03-21 22:15:52 +00:00
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// FIXME: Improve check.
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2011-03-23 23:35:17 +00:00
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// if (Sect->Flags != 0x80000400)
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// return Error("unsupported section type!");
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2011-03-21 22:15:52 +00:00
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2011-03-23 19:52:00 +00:00
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SectionBases.push_back((char*) Data.base() + Sect->Address);
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2011-03-21 22:15:52 +00:00
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}
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2011-03-23 23:35:17 +00:00
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// Bind all the symbols to address. Keep a record of the names for use
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// by relocation resolution.
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SmallVector<StringRef, 64> SymbolNames;
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2011-03-21 22:15:52 +00:00
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for (unsigned i = 0; i != SymtabLC->NumSymbolTableEntries; ++i) {
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InMemoryStruct<macho::SymbolTableEntry> STE;
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Obj->ReadSymbolTableEntry(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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2011-03-23 23:35:17 +00:00
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// Get the symbol name.
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StringRef Name = Obj->getStringAtIndex(STE->StringIndex);
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SymbolNames.push_back(Name);
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// Just skip undefined symbols. They'll be loaded from whatever
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// module they come from (or system dylib) when we resolve relocations
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// involving them.
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2011-03-21 22:15:52 +00:00
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if (STE->SectionIndex == 0)
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2011-03-23 23:35:17 +00:00
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continue;
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2011-03-21 22:15:52 +00:00
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unsigned Index = STE->SectionIndex - 1;
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if (Index >= Segment32LC->NumSections)
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return Error("invalid section index for symbol: '" + Twine() + "'");
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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.
|
|
|
|
if (STE->Type != 0xF)
|
|
|
|
return Error("unexpected symbol type!");
|
|
|
|
if (STE->Flags != 0x0)
|
|
|
|
return Error("unexpected symbol type!");
|
|
|
|
|
2011-03-23 19:52:00 +00:00
|
|
|
DEBUG(dbgs() << "Symbol: '" << Name << "' @ " << Address << "\n");
|
|
|
|
|
2011-03-21 22:15:52 +00:00
|
|
|
SymbolTable[Name] = Address;
|
|
|
|
}
|
|
|
|
|
2011-03-23 23:35:17 +00:00
|
|
|
// Now resolve any relocations.
|
|
|
|
for (unsigned i = 0, e = Relocations.size(); i != e; ++i) {
|
|
|
|
if (resolveRelocation(Relocations[i].first, Relocations[i].second,
|
|
|
|
SectionBases, SymbolNames))
|
|
|
|
return true;
|
|
|
|
}
|
|
|
|
|
2011-03-22 01:06:42 +00:00
|
|
|
// We've loaded the section; now mark the functions in it as executable.
|
|
|
|
// FIXME: We really should use the JITMemoryManager for this.
|
|
|
|
sys::Memory::setRangeExecutable(Data.base(), Data.size());
|
|
|
|
|
2011-03-21 22:15:52 +00:00
|
|
|
return false;
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
bool RuntimeDyldImpl::
|
|
|
|
loadSegment64(const MachOObject *Obj,
|
|
|
|
const MachOObject::LoadCommandInfo *SegmentLCI,
|
|
|
|
const InMemoryStruct<macho::SymtabLoadCommand> &SymtabLC) {
|
|
|
|
InMemoryStruct<macho::Segment64LoadCommand> Segment64LC;
|
|
|
|
Obj->ReadSegment64LoadCommand(*SegmentLCI, Segment64LC);
|
|
|
|
if (!Segment64LC)
|
|
|
|
return Error("unable to load segment load command");
|
|
|
|
|
|
|
|
// Map the segment into memory.
|
|
|
|
std::string ErrorStr;
|
|
|
|
Data = sys::Memory::AllocateRWX(Segment64LC->VMSize, 0, &ErrorStr);
|
|
|
|
if (!Data.base())
|
|
|
|
return Error("unable to allocate memory block: '" + ErrorStr + "'");
|
|
|
|
memcpy(Data.base(), Obj->getData(Segment64LC->FileOffset,
|
|
|
|
Segment64LC->FileSize).data(),
|
|
|
|
Segment64LC->FileSize);
|
|
|
|
memset((char*)Data.base() + Segment64LC->FileSize, 0,
|
|
|
|
Segment64LC->VMSize - Segment64LC->FileSize);
|
|
|
|
|
2011-03-23 19:52:00 +00:00
|
|
|
// Bind the section indices to addresses and record the relocations we
|
|
|
|
// need to resolve.
|
|
|
|
typedef std::pair<uint32_t, macho::RelocationEntry> RelocationMap;
|
|
|
|
SmallVector<RelocationMap, 64> Relocations;
|
|
|
|
|
|
|
|
SmallVector<void *, 16> SectionBases;
|
2011-03-21 22:15:52 +00:00
|
|
|
for (unsigned i = 0; i != Segment64LC->NumSections; ++i) {
|
|
|
|
InMemoryStruct<macho::Section64> Sect;
|
|
|
|
Obj->ReadSection64(*SegmentLCI, i, Sect);
|
|
|
|
if (!Sect)
|
|
|
|
return Error("unable to load section: '" + Twine(i) + "'");
|
|
|
|
|
2011-03-23 23:35:17 +00:00
|
|
|
// Remember any relocations the section has so we can resolve them later.
|
2011-03-23 19:52:00 +00:00
|
|
|
for (unsigned j = 0; j != Sect->NumRelocationTableEntries; ++j) {
|
|
|
|
InMemoryStruct<macho::RelocationEntry> RE;
|
|
|
|
Obj->ReadRelocationEntry(Sect->RelocationTableOffset, j, RE);
|
|
|
|
Relocations.push_back(RelocationMap(j, *RE));
|
|
|
|
}
|
2011-03-21 22:15:52 +00:00
|
|
|
|
|
|
|
// FIXME: Improve check.
|
|
|
|
if (Sect->Flags != 0x80000400)
|
|
|
|
return Error("unsupported section type!");
|
|
|
|
|
2011-03-23 19:52:00 +00:00
|
|
|
SectionBases.push_back((char*) Data.base() + Sect->Address);
|
2011-03-21 22:15:52 +00:00
|
|
|
}
|
|
|
|
|
2011-03-23 19:52:00 +00:00
|
|
|
// Bind all the symbols to address. Keep a record of the names for use
|
|
|
|
// by relocation resolution.
|
|
|
|
SmallVector<StringRef, 64> SymbolNames;
|
2011-03-21 22:15:52 +00:00
|
|
|
for (unsigned i = 0; i != SymtabLC->NumSymbolTableEntries; ++i) {
|
|
|
|
InMemoryStruct<macho::Symbol64TableEntry> STE;
|
|
|
|
Obj->ReadSymbol64TableEntry(SymtabLC->SymbolTableOffset, i, STE);
|
|
|
|
if (!STE)
|
|
|
|
return Error("unable to read symbol: '" + Twine(i) + "'");
|
2011-03-23 19:52:00 +00:00
|
|
|
// Get the symbol name.
|
|
|
|
StringRef Name = Obj->getStringAtIndex(STE->StringIndex);
|
|
|
|
SymbolNames.push_back(Name);
|
|
|
|
|
|
|
|
// Just skip undefined symbols. They'll be loaded from whatever
|
|
|
|
// module they come from (or system dylib) when we resolve relocations
|
|
|
|
// involving them.
|
2011-03-21 22:15:52 +00:00
|
|
|
if (STE->SectionIndex == 0)
|
2011-03-23 19:52:00 +00:00
|
|
|
continue;
|
2011-03-21 22:15:52 +00:00
|
|
|
|
|
|
|
unsigned Index = STE->SectionIndex - 1;
|
|
|
|
if (Index >= Segment64LC->NumSections)
|
|
|
|
return Error("invalid section index for symbol: '" + Twine() + "'");
|
|
|
|
|
|
|
|
// Get the section base address.
|
|
|
|
void *SectionBase = SectionBases[Index];
|
|
|
|
|
|
|
|
// Get the symbol address.
|
|
|
|
void *Address = (char*) SectionBase + STE->Value;
|
|
|
|
|
|
|
|
// FIXME: Check the symbol type and flags.
|
|
|
|
if (STE->Type != 0xF)
|
|
|
|
return Error("unexpected symbol type!");
|
|
|
|
if (STE->Flags != 0x0)
|
|
|
|
return Error("unexpected symbol type!");
|
|
|
|
|
2011-03-23 19:52:00 +00:00
|
|
|
DEBUG(dbgs() << "Symbol: '" << Name << "' @ " << Address << "\n");
|
2011-03-21 22:15:52 +00:00
|
|
|
SymbolTable[Name] = Address;
|
|
|
|
}
|
|
|
|
|
2011-03-23 19:52:00 +00:00
|
|
|
// Now resolve any relocations.
|
|
|
|
for (unsigned i = 0, e = Relocations.size(); i != e; ++i) {
|
|
|
|
if (resolveRelocation(Relocations[i].first, Relocations[i].second,
|
|
|
|
SectionBases, SymbolNames))
|
|
|
|
return true;
|
|
|
|
}
|
|
|
|
|
2011-03-22 01:06:42 +00:00
|
|
|
// We've loaded the section; now mark the functions in it as executable.
|
|
|
|
// FIXME: We really should use the JITMemoryManager for this.
|
|
|
|
sys::Memory::setRangeExecutable(Data.base(), Data.size());
|
|
|
|
|
2011-03-21 22:15:52 +00:00
|
|
|
return false;
|
|
|
|
}
|
|
|
|
|
|
|
|
bool RuntimeDyldImpl::loadObject(MemoryBuffer *InputBuffer) {
|
|
|
|
// If the linker is in an error state, don't do anything.
|
|
|
|
if (hasError())
|
|
|
|
return true;
|
|
|
|
// Load the Mach-O wrapper object.
|
|
|
|
std::string ErrorStr;
|
|
|
|
OwningPtr<MachOObject> Obj(
|
|
|
|
MachOObject::LoadFromBuffer(InputBuffer, &ErrorStr));
|
|
|
|
if (!Obj)
|
|
|
|
return Error("unable to load object: '" + ErrorStr + "'");
|
|
|
|
|
2011-03-23 22:06:06 +00:00
|
|
|
// Get the CPU type information from the header.
|
|
|
|
const macho::Header &Header = Obj->getHeader();
|
|
|
|
|
|
|
|
// FIXME: Error checking that the loaded object is compatible with
|
|
|
|
// the system we're running on.
|
|
|
|
CPUType = Header.CPUType;
|
|
|
|
CPUSubtype = Header.CPUSubtype;
|
|
|
|
|
2011-03-21 22:15:52 +00:00
|
|
|
// Validate that the load commands match what we expect.
|
|
|
|
const MachOObject::LoadCommandInfo *SegmentLCI = 0, *SymtabLCI = 0,
|
|
|
|
*DysymtabLCI = 0;
|
2011-03-23 22:06:06 +00:00
|
|
|
for (unsigned i = 0; i != Header.NumLoadCommands; ++i) {
|
2011-03-21 22:15:52 +00:00
|
|
|
const MachOObject::LoadCommandInfo &LCI = Obj->getLoadCommandInfo(i);
|
|
|
|
switch (LCI.Command.Type) {
|
|
|
|
case macho::LCT_Segment:
|
|
|
|
case macho::LCT_Segment64:
|
|
|
|
if (SegmentLCI)
|
|
|
|
return Error("unexpected input object (multiple segments)");
|
|
|
|
SegmentLCI = &LCI;
|
|
|
|
break;
|
|
|
|
case macho::LCT_Symtab:
|
|
|
|
if (SymtabLCI)
|
|
|
|
return Error("unexpected input object (multiple symbol tables)");
|
|
|
|
SymtabLCI = &LCI;
|
|
|
|
break;
|
|
|
|
case macho::LCT_Dysymtab:
|
|
|
|
if (DysymtabLCI)
|
|
|
|
return Error("unexpected input object (multiple symbol tables)");
|
|
|
|
DysymtabLCI = &LCI;
|
|
|
|
break;
|
|
|
|
default:
|
|
|
|
return Error("unexpected input object (unexpected load command");
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
if (!SymtabLCI)
|
|
|
|
return Error("no symbol table found in object");
|
|
|
|
if (!SegmentLCI)
|
|
|
|
return Error("no symbol table found in object");
|
|
|
|
|
|
|
|
// Read and register the symbol table data.
|
|
|
|
InMemoryStruct<macho::SymtabLoadCommand> SymtabLC;
|
|
|
|
Obj->ReadSymtabLoadCommand(*SymtabLCI, SymtabLC);
|
|
|
|
if (!SymtabLC)
|
|
|
|
return Error("unable to load symbol table load command");
|
|
|
|
Obj->RegisterStringTable(*SymtabLC);
|
|
|
|
|
|
|
|
// Read the dynamic link-edit information, if present (not present in static
|
|
|
|
// objects).
|
|
|
|
if (DysymtabLCI) {
|
|
|
|
InMemoryStruct<macho::DysymtabLoadCommand> DysymtabLC;
|
|
|
|
Obj->ReadDysymtabLoadCommand(*DysymtabLCI, DysymtabLC);
|
|
|
|
if (!DysymtabLC)
|
|
|
|
return Error("unable to load dynamic link-exit load command");
|
|
|
|
|
|
|
|
// FIXME: We don't support anything interesting yet.
|
2011-03-23 19:52:00 +00:00
|
|
|
// if (DysymtabLC->LocalSymbolsIndex != 0)
|
|
|
|
// return Error("NOT YET IMPLEMENTED: local symbol entries");
|
|
|
|
// if (DysymtabLC->ExternalSymbolsIndex != 0)
|
|
|
|
// return Error("NOT YET IMPLEMENTED: non-external symbol entries");
|
|
|
|
// if (DysymtabLC->UndefinedSymbolsIndex != SymtabLC->NumSymbolTableEntries)
|
|
|
|
// return Error("NOT YET IMPLEMENTED: undefined symbol entries");
|
2011-03-21 22:15:52 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
// Load the segment load command.
|
|
|
|
if (SegmentLCI->Command.Type == macho::LCT_Segment) {
|
|
|
|
if (loadSegment32(Obj.get(), SegmentLCI, SymtabLC))
|
|
|
|
return true;
|
|
|
|
} else {
|
|
|
|
if (loadSegment64(Obj.get(), SegmentLCI, SymtabLC))
|
|
|
|
return true;
|
|
|
|
}
|
|
|
|
|
|
|
|
return false;
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
// RuntimeDyld class implementation
|
2011-03-29 21:03:05 +00:00
|
|
|
RuntimeDyld::RuntimeDyld(JITMemoryManager *JMM) {
|
|
|
|
Dyld = new RuntimeDyldImpl(JMM);
|
2011-03-21 22:15:52 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
RuntimeDyld::~RuntimeDyld() {
|
|
|
|
delete Dyld;
|
|
|
|
}
|
|
|
|
|
|
|
|
bool RuntimeDyld::loadObject(MemoryBuffer *InputBuffer) {
|
|
|
|
return Dyld->loadObject(InputBuffer);
|
|
|
|
}
|
|
|
|
|
|
|
|
void *RuntimeDyld::getSymbolAddress(StringRef Name) {
|
|
|
|
return Dyld->getSymbolAddress(Name);
|
|
|
|
}
|
|
|
|
|
|
|
|
sys::MemoryBlock RuntimeDyld::getMemoryBlock() {
|
|
|
|
return Dyld->getMemoryBlock();
|
|
|
|
}
|
|
|
|
|
2011-03-22 18:22:27 +00:00
|
|
|
StringRef RuntimeDyld::getErrorString() {
|
2011-03-22 18:19:42 +00:00
|
|
|
return Dyld->getErrorString();
|
|
|
|
}
|
|
|
|
|
2011-03-21 22:15:52 +00:00
|
|
|
} // end namespace llvm
|