forked from OSchip/llvm-project
663 lines
23 KiB
C++
663 lines
23 KiB
C++
|
//===- lib/FileFormat/MachO/ArchHandler_arm.cpp ---------------------------===//
|
||
|
|
//
|
||
|
|
// The LLVM Linker
|
||
|
|
//
|
||
|
|
// This file is distributed under the University of Illinois Open Source
|
||
|
|
// License. See LICENSE.TXT for details.
|
||
|
|
//
|
||
|
|
//===----------------------------------------------------------------------===//
|
||
|
|
|
||
|
|
#include "ArchHandler.h"
|
||
|
|
#include "Atoms.h"
|
||
|
|
#include "MachONormalizedFileBinaryUtils.h"
|
||
|
|
|
||
|
|
#include "llvm/ADT/StringRef.h"
|
||
|
|
#include "llvm/ADT/StringSwitch.h"
|
||
|
|
#include "llvm/ADT/Triple.h"
|
||
|
|
|
||
|
|
#include "llvm/Support/ErrorHandling.h"
|
||
|
|
|
||
|
|
using namespace llvm::MachO;
|
||
|
|
using namespace lld::mach_o::normalized;
|
||
|
|
|
||
|
|
namespace lld {
|
||
|
|
namespace mach_o {
|
||
|
|
|
||
|
|
class ArchHandler_arm : public ArchHandler {
|
||
|
|
public:
|
||
|
|
ArchHandler_arm();
|
||
|
|
virtual ~ArchHandler_arm();
|
||
|
|
|
||
|
|
const Registry::KindStrings *kindStrings() override { return _sKindStrings; }
|
||
|
|
|
||
|
|
Reference::KindArch kindArch() override { return Reference::KindArch::ARM; }
|
||
|
|
|
||
|
|
const ArchHandler::StubInfo &stubInfo() override;
|
||
|
|
bool isCallSite(const Reference &) override;
|
||
|
|
bool isPointer(const Reference &) override;
|
||
|
|
bool isPairedReloc(const normalized::Relocation &) override;
|
||
|
|
std::error_code getReferenceInfo(const normalized::Relocation &reloc,
|
||
|
|
const DefinedAtom *inAtom,
|
||
|
|
uint32_t offsetInAtom,
|
||
|
|
uint64_t fixupAddress, bool swap,
|
||
|
|
FindAtomBySectionAndAddress atomFromAddress,
|
||
|
|
FindAtomBySymbolIndex atomFromSymbolIndex,
|
||
|
|
Reference::KindValue *kind,
|
||
|
|
const lld::Atom **target,
|
||
|
|
Reference::Addend *addend) override;
|
||
|
|
std::error_code
|
||
|
|
getPairReferenceInfo(const normalized::Relocation &reloc1,
|
||
|
|
const normalized::Relocation &reloc2,
|
||
|
|
const DefinedAtom *inAtom,
|
||
|
|
uint32_t offsetInAtom,
|
||
|
|
uint64_t fixupAddress, bool swap,
|
||
|
|
FindAtomBySectionAndAddress atomFromAddress,
|
||
|
|
FindAtomBySymbolIndex atomFromSymbolIndex,
|
||
|
|
Reference::KindValue *kind,
|
||
|
|
const lld::Atom **target,
|
||
|
|
Reference::Addend *addend) override;
|
||
|
|
|
||
|
|
void applyFixup(Reference::KindNamespace ns, Reference::KindArch arch,
|
||
|
|
Reference::KindValue kindValue, uint64_t addend,
|
||
|
|
uint8_t *location, uint64_t fixupAddress,
|
||
|
|
uint64_t targetAddress, uint64_t inAtomAddress)
|
||
|
|
override;
|
||
|
|
|
||
|
|
private:
|
||
|
|
static const Registry::KindStrings _sKindStrings[];
|
||
|
|
static const StubInfo _sStubInfoArmPIC;
|
||
|
|
|
||
|
|
enum : Reference::KindValue {
|
||
|
|
invalid, /// for error condition
|
||
|
|
|
||
|
|
// Kinds found in mach-o .o files:
|
||
|
|
thumb_b22, /// ex: bl _foo
|
||
|
|
thumb_movw, /// ex: movw r1, :lower16:_foo
|
||
|
|
thumb_movt, /// ex: movt r1, :lower16:_foo
|
||
|
|
thumb_movw_funcRel, /// ex: movw r1, :lower16:(_foo-(L1+4))
|
||
|
|
thumb_movt_funcRel, /// ex: movt r1, :upper16:(_foo-(L1+4))
|
||
|
|
arm_b24, /// ex: bl _foo
|
||
|
|
arm_movw, /// ex: movw r1, :lower16:_foo
|
||
|
|
arm_movt, /// ex: movt r1, :lower16:_foo
|
||
|
|
arm_movw_funcRel, /// ex: movw r1, :lower16:(_foo-(L1+4))
|
||
|
|
arm_movt_funcRel, /// ex: movt r1, :upper16:(_foo-(L1+4))
|
||
|
|
pointer32, /// ex: .long _foo
|
||
|
|
delta32, /// ex: .long _foo - .
|
||
|
|
|
||
|
|
// Kinds introduced by Passes:
|
||
|
|
lazyPointer, /// Location contains a lazy pointer.
|
||
|
|
lazyImmediateLocation, /// Location contains immediate value used in stub.
|
||
|
|
};
|
||
|
|
|
||
|
|
int32_t getDisplacementFromThumbBranch(uint32_t instruction);
|
||
|
|
int32_t getDisplacementFromArmBranch(uint32_t instruction);
|
||
|
|
uint16_t getWordFromThumbMov(uint32_t instruction);
|
||
|
|
uint16_t getWordFromArmMov(uint32_t instruction);
|
||
|
|
uint32_t clearThumbBit(uint32_t value, const Atom *target);
|
||
|
|
uint32_t setDisplacementInArmBranch(uint32_t instruction, int32_t disp);
|
||
|
|
|
||
|
|
|
||
|
|
const bool _swap;
|
||
|
|
};
|
||
|
|
|
||
|
|
//===----------------------------------------------------------------------===//
|
||
|
|
// ArchHandler_arm
|
||
|
|
//===----------------------------------------------------------------------===//
|
||
|
|
|
||
|
|
ArchHandler_arm::ArchHandler_arm() :
|
||
|
|
_swap(!MachOLinkingContext::isHostEndian(MachOLinkingContext::arch_armv7)) {}
|
||
|
|
|
||
|
|
ArchHandler_arm::~ArchHandler_arm() { }
|
||
|
|
|
||
|
|
const Registry::KindStrings ArchHandler_arm::_sKindStrings[] = {
|
||
|
|
LLD_KIND_STRING_ENTRY(thumb_b22),
|
||
|
|
LLD_KIND_STRING_ENTRY(thumb_movw),
|
||
|
|
LLD_KIND_STRING_ENTRY(thumb_movt),
|
||
|
|
LLD_KIND_STRING_ENTRY(thumb_movw_funcRel),
|
||
|
|
LLD_KIND_STRING_ENTRY(thumb_movt_funcRel),
|
||
|
|
LLD_KIND_STRING_ENTRY(arm_b24),
|
||
|
|
LLD_KIND_STRING_ENTRY(arm_movw),
|
||
|
|
LLD_KIND_STRING_ENTRY(arm_movt),
|
||
|
|
LLD_KIND_STRING_ENTRY(arm_movw_funcRel),
|
||
|
|
LLD_KIND_STRING_ENTRY(arm_movt_funcRel),
|
||
|
|
LLD_KIND_STRING_ENTRY(pointer32),
|
||
|
|
LLD_KIND_STRING_ENTRY(delta32),
|
||
|
|
LLD_KIND_STRING_ENTRY(lazyPointer),
|
||
|
|
LLD_KIND_STRING_ENTRY(lazyImmediateLocation),
|
||
|
|
LLD_KIND_STRING_END
|
||
|
|
};
|
||
|
|
|
||
|
|
const ArchHandler::StubInfo ArchHandler_arm::_sStubInfoArmPIC = {
|
||
|
|
"dyld_stub_binder",
|
||
|
|
|
||
|
|
// References in lazy pointer
|
||
|
|
{ Reference::KindArch::ARM, pointer32, 0, 0 },
|
||
|
|
{ Reference::KindArch::ARM, lazyPointer, 0, 0 },
|
||
|
|
|
||
|
|
// GOT pointer to dyld_stub_binder
|
||
|
|
{ Reference::KindArch::ARM, pointer32, 0, 0 },
|
||
|
|
|
||
|
|
// arm code alignment 2^2
|
||
|
|
2,
|
||
|
|
|
||
|
|
// Stub size and code
|
||
|
|
16,
|
||
|
|
{ 0x04, 0xC0, 0x9F, 0xE5, // ldr ip, pc + 12
|
||
|
|
0x0C, 0xC0, 0x8F, 0xE0, // add ip, pc, ip
|
||
|
|
0x00, 0xF0, 0x9C, 0xE5, // ldr pc, [ip]
|
||
|
|
0x00, 0x00, 0x00, 0x00 }, // .long L_foo$lazy_ptr - (L1$scv + 8)
|
||
|
|
{ Reference::KindArch::ARM, delta32, 12, 0 },
|
||
|
|
|
||
|
|
// Stub Helper size and code
|
||
|
|
12,
|
||
|
|
{ 0x00, 0xC0, 0x9F, 0xE5, // ldr ip, [pc, #0]
|
||
|
|
0x00, 0x00, 0x00, 0xEA, // b _helperhelper
|
||
|
|
0x00, 0x00, 0x00, 0x00 }, // .long lazy-info-offset
|
||
|
|
{ Reference::KindArch::ARM, lazyImmediateLocation, 8, 0 },
|
||
|
|
{ Reference::KindArch::ARM, arm_b24, 4, 0 },
|
||
|
|
|
||
|
|
// Stub Helper-Common size and code
|
||
|
|
36,
|
||
|
|
{ // push lazy-info-offset
|
||
|
|
0x04, 0xC0, 0x2D, 0xE5, // str ip, [sp, #-4]!
|
||
|
|
// push address of dyld_mageLoaderCache
|
||
|
|
0x10, 0xC0, 0x9F, 0xE5, // ldr ip, L1
|
||
|
|
0x0C, 0xC0, 0x8F, 0xE0, // add ip, pc, ip
|
||
|
|
0x04, 0xC0, 0x2D, 0xE5, // str ip, [sp, #-4]!
|
||
|
|
// jump through dyld_stub_binder
|
||
|
|
0x08, 0xC0, 0x9F, 0xE5, // ldr ip, L2
|
||
|
|
0x0C, 0xC0, 0x8F, 0xE0, // add ip, pc, ip
|
||
|
|
0x00, 0xF0, 0x9C, 0xE5, // ldr pc, [ip]
|
||
|
|
0x00, 0x00, 0x00, 0x00, // L1: .long fFastStubGOTAtom - (helper+16)
|
||
|
|
0x00, 0x00, 0x00, 0x00 }, // L2: .long dyld_stub_binder - (helper+28)
|
||
|
|
{ Reference::KindArch::ARM, delta32, 28, 0 },
|
||
|
|
{ Reference::KindArch::ARM, delta32, 32, 0 }
|
||
|
|
};
|
||
|
|
|
||
|
|
const ArchHandler::StubInfo &ArchHandler_arm::stubInfo() {
|
||
|
|
// If multiple kinds of stubs are supported, select which StubInfo here.
|
||
|
|
return _sStubInfoArmPIC;
|
||
|
|
}
|
||
|
|
|
||
|
|
bool ArchHandler_arm::isCallSite(const Reference &ref) {
|
||
|
|
return (ref.kindValue() == thumb_b22) || (ref.kindValue() == arm_b24);
|
||
|
|
}
|
||
|
|
|
||
|
|
bool ArchHandler_arm::isPointer(const Reference &ref) {
|
||
|
|
return (ref.kindValue() == pointer32);
|
||
|
|
}
|
||
|
|
|
||
|
|
bool ArchHandler_arm::isPairedReloc(const Relocation &reloc) {
|
||
|
|
switch (reloc.type) {
|
||
|
|
case ARM_RELOC_SECTDIFF:
|
||
|
|
case ARM_RELOC_LOCAL_SECTDIFF:
|
||
|
|
case ARM_RELOC_HALF_SECTDIFF:
|
||
|
|
case ARM_RELOC_HALF:
|
||
|
|
return true;
|
||
|
|
default:
|
||
|
|
return false;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
int32_t ArchHandler_arm::getDisplacementFromThumbBranch(uint32_t instruction) {
|
||
|
|
uint32_t s = (instruction >> 10) & 0x1;
|
||
|
|
uint32_t j1 = (instruction >> 29) & 0x1;
|
||
|
|
uint32_t j2 = (instruction >> 27) & 0x1;
|
||
|
|
uint32_t imm10 = instruction & 0x3FF;
|
||
|
|
uint32_t imm11 = (instruction >> 16) & 0x7FF;
|
||
|
|
uint32_t i1 = (j1 == s);
|
||
|
|
uint32_t i2 = (j2 == s);
|
||
|
|
uint32_t dis =
|
||
|
|
(s << 24) | (i1 << 23) | (i2 << 22) | (imm10 << 12) | (imm11 << 1);
|
||
|
|
int32_t sdis = dis;
|
||
|
|
if (s)
|
||
|
|
return (sdis | 0xFE000000);
|
||
|
|
else
|
||
|
|
return sdis;
|
||
|
|
}
|
||
|
|
|
||
|
|
int32_t ArchHandler_arm::getDisplacementFromArmBranch(uint32_t instruction) {
|
||
|
|
// Sign-extend imm24
|
||
|
|
int32_t displacement = (instruction & 0x00FFFFFF) << 2;
|
||
|
|
if ((displacement & 0x02000000) != 0)
|
||
|
|
displacement |= 0xFC000000;
|
||
|
|
// If this is BLX and H bit set, add 2.
|
||
|
|
if ((instruction & 0xFF000000) == 0xFB000000)
|
||
|
|
displacement += 2;
|
||
|
|
return displacement;
|
||
|
|
}
|
||
|
|
|
||
|
|
uint32_t ArchHandler_arm::setDisplacementInArmBranch(uint32_t instruction,
|
||
|
|
int32_t displacement) {
|
||
|
|
// FIXME: handle BLX and out-of-range.
|
||
|
|
uint32_t newInstruction = (instruction & 0xFF000000);
|
||
|
|
newInstruction |= ((displacement >> 2) & 0x00FFFFFF);
|
||
|
|
return newInstruction;
|
||
|
|
}
|
||
|
|
|
||
|
|
uint16_t ArchHandler_arm::getWordFromThumbMov(uint32_t instruction) {
|
||
|
|
uint32_t i = ((instruction & 0x00000400) >> 10);
|
||
|
|
uint32_t imm4 = (instruction & 0x0000000F);
|
||
|
|
uint32_t imm3 = ((instruction & 0x70000000) >> 28);
|
||
|
|
uint32_t imm8 = ((instruction & 0x00FF0000) >> 16);
|
||
|
|
return (imm4 << 12) | (i << 11) | (imm3 << 8) | imm8;
|
||
|
|
}
|
||
|
|
|
||
|
|
uint16_t ArchHandler_arm::getWordFromArmMov(uint32_t instruction) {
|
||
|
|
uint32_t imm4 = ((instruction & 0x000F0000) >> 16);
|
||
|
|
uint32_t imm12 = (instruction & 0x00000FFF);
|
||
|
|
return (imm4 << 12) | imm12;
|
||
|
|
}
|
||
|
|
|
||
|
|
uint32_t ArchHandler_arm::clearThumbBit(uint32_t value, const Atom *target) {
|
||
|
|
// The assembler often adds one to the address of a thumb function.
|
||
|
|
// We need to undo that so it does not look like an addend.
|
||
|
|
if (value & 1) {
|
||
|
|
if (isa<DefinedAtom>(target)) {
|
||
|
|
const MachODefinedAtom *machoTarget =
|
||
|
|
reinterpret_cast<const MachODefinedAtom *>(target);
|
||
|
|
if (machoTarget->isThumb())
|
||
|
|
value &= -2; // mask off thumb-bit
|
||
|
|
}
|
||
|
|
}
|
||
|
|
return value;
|
||
|
|
}
|
||
|
|
|
||
|
|
std::error_code ArchHandler_arm::getReferenceInfo(
|
||
|
|
const Relocation &reloc, const DefinedAtom *inAtom, uint32_t offsetInAtom,
|
||
|
|
uint64_t fixupAddress, bool swap,
|
||
|
|
FindAtomBySectionAndAddress atomFromAddress,
|
||
|
|
FindAtomBySymbolIndex atomFromSymbolIndex, Reference::KindValue *kind,
|
||
|
|
const lld::Atom **target, Reference::Addend *addend) {
|
||
|
|
typedef std::error_code E;
|
||
|
|
const uint8_t *fixupContent = &inAtom->rawContent()[offsetInAtom];
|
||
|
|
uint64_t targetAddress;
|
||
|
|
uint32_t instruction = readU32(swap, fixupContent);
|
||
|
|
int32_t displacement;
|
||
|
|
switch (relocPattern(reloc)) {
|
||
|
|
case ARM_THUMB_RELOC_BR22 | rPcRel | rExtern | rLength4:
|
||
|
|
// ex: bl _foo (and _foo is undefined)
|
||
|
|
*kind = thumb_b22;
|
||
|
|
if (E ec = atomFromSymbolIndex(reloc.symbol, target))
|
||
|
|
return ec;
|
||
|
|
// Instruction contains branch to addend.
|
||
|
|
displacement = getDisplacementFromThumbBranch(instruction);
|
||
|
|
*addend = fixupAddress + 4 + displacement;
|
||
|
|
return std::error_code();
|
||
|
|
case ARM_THUMB_RELOC_BR22 | rPcRel | rLength4:
|
||
|
|
// ex: bl _foo (and _foo is defined)
|
||
|
|
*kind = thumb_b22;
|
||
|
|
displacement = getDisplacementFromThumbBranch(instruction);
|
||
|
|
targetAddress = fixupAddress + 4 + displacement;
|
||
|
|
return atomFromAddress(reloc.symbol, targetAddress, target, addend);
|
||
|
|
case ARM_THUMB_RELOC_BR22 | rScattered | rPcRel | rLength4:
|
||
|
|
// ex: bl _foo+4 (and _foo is defined)
|
||
|
|
*kind = thumb_b22;
|
||
|
|
displacement = getDisplacementFromThumbBranch(instruction);
|
||
|
|
targetAddress = fixupAddress + 4 + displacement;
|
||
|
|
if (E ec = atomFromAddress(0, reloc.value, target, addend))
|
||
|
|
return ec;
|
||
|
|
// reloc.value is target atom's address. Instruction contains branch
|
||
|
|
// to atom+addend.
|
||
|
|
*addend += (targetAddress - reloc.value);
|
||
|
|
return std::error_code();
|
||
|
|
case ARM_RELOC_BR24 | rPcRel | rExtern | rLength4:
|
||
|
|
// ex: bl _foo (and _foo is undefined)
|
||
|
|
*kind = arm_b24;
|
||
|
|
if (E ec = atomFromSymbolIndex(reloc.symbol, target))
|
||
|
|
return ec;
|
||
|
|
// Instruction contains branch to addend.
|
||
|
|
displacement = getDisplacementFromArmBranch(instruction);
|
||
|
|
*addend = fixupAddress + 8 + displacement;
|
||
|
|
return std::error_code();
|
||
|
|
case ARM_RELOC_BR24 | rPcRel | rLength4:
|
||
|
|
// ex: bl _foo (and _foo is defined)
|
||
|
|
*kind = arm_b24;
|
||
|
|
displacement = getDisplacementFromArmBranch(instruction);
|
||
|
|
targetAddress = fixupAddress + 8 + displacement;
|
||
|
|
return atomFromAddress(reloc.symbol, targetAddress, target, addend);
|
||
|
|
case ARM_RELOC_BR24 | rScattered | rPcRel | rLength4:
|
||
|
|
// ex: bl _foo+4 (and _foo is defined)
|
||
|
|
*kind = arm_b24;
|
||
|
|
displacement = getDisplacementFromArmBranch(instruction);
|
||
|
|
targetAddress = fixupAddress + 8 + displacement;
|
||
|
|
if (E ec = atomFromAddress(0, reloc.value, target, addend))
|
||
|
|
return ec;
|
||
|
|
// reloc.value is target atom's address. Instruction contains branch
|
||
|
|
// to atom+addend.
|
||
|
|
*addend += (targetAddress - reloc.value);
|
||
|
|
return std::error_code();
|
||
|
|
case ARM_RELOC_VANILLA | rExtern | rLength4:
|
||
|
|
// ex: .long _foo (and _foo is undefined)
|
||
|
|
*kind = pointer32;
|
||
|
|
if (E ec = atomFromSymbolIndex(reloc.symbol, target))
|
||
|
|
return ec;
|
||
|
|
*addend = instruction;
|
||
|
|
return std::error_code();
|
||
|
|
case ARM_RELOC_VANILLA | rLength4:
|
||
|
|
// ex: .long _foo (and _foo is defined)
|
||
|
|
*kind = pointer32;
|
||
|
|
if (E ec = atomFromAddress(reloc.symbol, instruction, target, addend))
|
||
|
|
return ec;
|
||
|
|
*addend = clearThumbBit((uint32_t) * addend, *target);
|
||
|
|
return std::error_code();
|
||
|
|
case ARM_RELOC_VANILLA | rScattered | rLength4:
|
||
|
|
// ex: .long _foo+a (and _foo is defined)
|
||
|
|
*kind = pointer32;
|
||
|
|
if (E ec = atomFromAddress(0, reloc.value, target, addend))
|
||
|
|
return ec;
|
||
|
|
*addend += (clearThumbBit(instruction, *target) - reloc.value);
|
||
|
|
return std::error_code();
|
||
|
|
default:
|
||
|
|
return make_dynamic_error_code(Twine("unsupported arm relocation type"));
|
||
|
|
}
|
||
|
|
return std::error_code();
|
||
|
|
}
|
||
|
|
|
||
|
|
std::error_code
|
||
|
|
ArchHandler_arm::getPairReferenceInfo(const normalized::Relocation &reloc1,
|
||
|
|
const normalized::Relocation &reloc2,
|
||
|
|
const DefinedAtom *inAtom,
|
||
|
|
uint32_t offsetInAtom,
|
||
|
|
uint64_t fixupAddress, bool swap,
|
||
|
|
FindAtomBySectionAndAddress atomFromAddr,
|
||
|
|
FindAtomBySymbolIndex atomFromSymbolIndex,
|
||
|
|
Reference::KindValue *kind,
|
||
|
|
const lld::Atom **target,
|
||
|
|
Reference::Addend *addend) {
|
||
|
|
bool pointerDiff = false;
|
||
|
|
bool funcRel;
|
||
|
|
bool top;
|
||
|
|
bool thumbReloc;
|
||
|
|
switch(relocPattern(reloc1) << 16 | relocPattern(reloc2)) {
|
||
|
|
case ((ARM_RELOC_HALF_SECTDIFF | rScattered | rLength4) << 16 |
|
||
|
|
ARM_RELOC_PAIR | rScattered | rLength4):
|
||
|
|
// ex: movw r1, :lower16:(_x-L1) [thumb mode]
|
||
|
|
*kind = thumb_movw_funcRel;
|
||
|
|
funcRel = true;
|
||
|
|
top = false;
|
||
|
|
thumbReloc = true;
|
||
|
|
break;
|
||
|
|
case ((ARM_RELOC_HALF_SECTDIFF | rScattered | rLength8) << 16 |
|
||
|
|
ARM_RELOC_PAIR | rScattered | rLength8):
|
||
|
|
// ex: movt r1, :upper16:(_x-L1) [thumb mode]
|
||
|
|
*kind = thumb_movt_funcRel;
|
||
|
|
funcRel = true;
|
||
|
|
top = true;
|
||
|
|
thumbReloc = true;
|
||
|
|
break;
|
||
|
|
case ((ARM_RELOC_HALF_SECTDIFF | rScattered | rLength1) << 16 |
|
||
|
|
ARM_RELOC_PAIR | rScattered | rLength1):
|
||
|
|
// ex: movw r1, :lower16:(_x-L1) [arm mode]
|
||
|
|
*kind = arm_movw_funcRel;
|
||
|
|
funcRel = true;
|
||
|
|
top = false;
|
||
|
|
thumbReloc = false;
|
||
|
|
break;
|
||
|
|
case ((ARM_RELOC_HALF_SECTDIFF | rScattered | rLength2) << 16 |
|
||
|
|
ARM_RELOC_PAIR | rScattered | rLength2):
|
||
|
|
// ex: movt r1, :upper16:(_x-L1) [arm mode]
|
||
|
|
*kind = arm_movt_funcRel;
|
||
|
|
funcRel = true;
|
||
|
|
top = true;
|
||
|
|
thumbReloc = false;
|
||
|
|
break;
|
||
|
|
case ((ARM_RELOC_HALF | rLength4) << 16 |
|
||
|
|
ARM_RELOC_PAIR | rLength4):
|
||
|
|
// ex: movw r1, :lower16:_x [thumb mode]
|
||
|
|
*kind = thumb_movw;
|
||
|
|
funcRel = false;
|
||
|
|
top = false;
|
||
|
|
thumbReloc = true;
|
||
|
|
break;
|
||
|
|
case ((ARM_RELOC_HALF | rLength8) << 16 |
|
||
|
|
ARM_RELOC_PAIR | rLength8):
|
||
|
|
// ex: movt r1, :upper16:_x [thumb mode]
|
||
|
|
*kind = thumb_movt;
|
||
|
|
funcRel = false;
|
||
|
|
top = true;
|
||
|
|
thumbReloc = true;
|
||
|
|
break;
|
||
|
|
case ((ARM_RELOC_HALF | rLength1) << 16 |
|
||
|
|
ARM_RELOC_PAIR | rLength1):
|
||
|
|
// ex: movw r1, :lower16:_x [arm mode]
|
||
|
|
*kind = arm_movw;
|
||
|
|
funcRel = false;
|
||
|
|
top = false;
|
||
|
|
thumbReloc = false;
|
||
|
|
break;
|
||
|
|
case ((ARM_RELOC_HALF | rLength2) << 16 |
|
||
|
|
ARM_RELOC_PAIR | rLength2):
|
||
|
|
// ex: movt r1, :upper16:_x [arm mode]
|
||
|
|
*kind = arm_movt;
|
||
|
|
funcRel = false;
|
||
|
|
top = true;
|
||
|
|
thumbReloc = false;
|
||
|
|
break;
|
||
|
|
case ((ARM_RELOC_HALF | rScattered | rLength4) << 16 |
|
||
|
|
ARM_RELOC_PAIR | rLength4):
|
||
|
|
// ex: movw r1, :lower16:_x+a [thumb mode]
|
||
|
|
*kind = thumb_movw;
|
||
|
|
funcRel = false;
|
||
|
|
top = false;
|
||
|
|
thumbReloc = true;
|
||
|
|
break;
|
||
|
|
case ((ARM_RELOC_HALF | rScattered | rLength8) << 16 |
|
||
|
|
ARM_RELOC_PAIR | rLength8):
|
||
|
|
// ex: movt r1, :upper16:_x+a [thumb mode]
|
||
|
|
*kind = thumb_movt;
|
||
|
|
funcRel = false;
|
||
|
|
top = true;
|
||
|
|
thumbReloc = true;
|
||
|
|
break;
|
||
|
|
case ((ARM_RELOC_HALF | rScattered | rLength1) << 16 |
|
||
|
|
ARM_RELOC_PAIR | rLength1):
|
||
|
|
// ex: movw r1, :lower16:_x+a [arm mode]
|
||
|
|
*kind = arm_movw;
|
||
|
|
funcRel = false;
|
||
|
|
top = false;
|
||
|
|
thumbReloc = false;
|
||
|
|
break;
|
||
|
|
case ((ARM_RELOC_HALF | rScattered | rLength2) << 16 |
|
||
|
|
ARM_RELOC_PAIR | rLength2):
|
||
|
|
// ex: movt r1, :upper16:_x+a [arm mode]
|
||
|
|
*kind = arm_movt;
|
||
|
|
funcRel = false;
|
||
|
|
top = true;
|
||
|
|
thumbReloc = false;
|
||
|
|
break;
|
||
|
|
case ((ARM_RELOC_HALF | rExtern | rLength4) << 16 |
|
||
|
|
ARM_RELOC_PAIR | rLength4):
|
||
|
|
// ex: movw r1, :lower16:_undef [thumb mode]
|
||
|
|
*kind = thumb_movw;
|
||
|
|
funcRel = false;
|
||
|
|
top = false;
|
||
|
|
thumbReloc = true;
|
||
|
|
break;
|
||
|
|
case ((ARM_RELOC_HALF | rExtern | rLength8) << 16 |
|
||
|
|
ARM_RELOC_PAIR | rLength8):
|
||
|
|
// ex: movt r1, :upper16:_undef [thumb mode]
|
||
|
|
*kind = thumb_movt;
|
||
|
|
funcRel = false;
|
||
|
|
top = true;
|
||
|
|
thumbReloc = true;
|
||
|
|
break;
|
||
|
|
case ((ARM_RELOC_HALF | rExtern | rLength1) << 16 |
|
||
|
|
ARM_RELOC_PAIR | rLength1):
|
||
|
|
// ex: movw r1, :lower16:_undef [arm mode]
|
||
|
|
*kind = arm_movw;
|
||
|
|
funcRel = false;
|
||
|
|
top = false;
|
||
|
|
thumbReloc = false;
|
||
|
|
break;
|
||
|
|
case ((ARM_RELOC_HALF | rExtern | rLength2) << 16 |
|
||
|
|
ARM_RELOC_PAIR | rLength2):
|
||
|
|
// ex: movt r1, :upper16:_undef [arm mode]
|
||
|
|
*kind = arm_movt;
|
||
|
|
funcRel = false;
|
||
|
|
top = true;
|
||
|
|
thumbReloc = false;
|
||
|
|
break;
|
||
|
|
case ((ARM_RELOC_SECTDIFF | rScattered | rLength4) << 16 |
|
||
|
|
ARM_RELOC_PAIR | rScattered | rLength4):
|
||
|
|
case ((ARM_RELOC_LOCAL_SECTDIFF | rScattered | rLength4) << 16 |
|
||
|
|
ARM_RELOC_PAIR | rScattered | rLength4):
|
||
|
|
// ex: .long _foo - .
|
||
|
|
pointerDiff = true;
|
||
|
|
break;
|
||
|
|
default:
|
||
|
|
return make_dynamic_error_code(Twine("unsupported arm relocation pair"));
|
||
|
|
}
|
||
|
|
const uint8_t *fixupContent = &inAtom->rawContent()[offsetInAtom];
|
||
|
|
std::error_code ec;
|
||
|
|
uint32_t instruction = readU32(swap, fixupContent);
|
||
|
|
uint32_t value;
|
||
|
|
uint32_t fromAddress;
|
||
|
|
uint32_t toAddress;
|
||
|
|
uint16_t instruction16;
|
||
|
|
uint16_t other16;
|
||
|
|
const lld::Atom *fromTarget;
|
||
|
|
Reference::Addend offsetInTo;
|
||
|
|
Reference::Addend offsetInFrom;
|
||
|
|
if (pointerDiff) {
|
||
|
|
toAddress = reloc1.value;
|
||
|
|
fromAddress = reloc2.value;
|
||
|
|
ec = atomFromAddr(0, toAddress, target, &offsetInTo);
|
||
|
|
if (ec)
|
||
|
|
return ec;
|
||
|
|
ec = atomFromAddr(0, fromAddress, &fromTarget, &offsetInFrom);
|
||
|
|
if (ec)
|
||
|
|
return ec;
|
||
|
|
if (fromTarget != inAtom)
|
||
|
|
return make_dynamic_error_code(Twine("SECTDIFF relocation where "
|
||
|
|
"subtrahend label is not in atom"));
|
||
|
|
*kind = delta32;
|
||
|
|
value = clearThumbBit(instruction, *target);
|
||
|
|
*addend = value - (toAddress - fromAddress);
|
||
|
|
} else if (funcRel) {
|
||
|
|
toAddress = reloc1.value;
|
||
|
|
fromAddress = reloc2.value;
|
||
|
|
ec = atomFromAddr(0, toAddress, target, &offsetInTo);
|
||
|
|
if (ec)
|
||
|
|
return ec;
|
||
|
|
ec = atomFromAddr(0, fromAddress, &fromTarget, &offsetInFrom);
|
||
|
|
if (ec)
|
||
|
|
return ec;
|
||
|
|
if (fromTarget != inAtom)
|
||
|
|
return make_dynamic_error_code(
|
||
|
|
Twine("ARM_RELOC_HALF_SECTDIFF relocation "
|
||
|
|
"where subtrahend label is not in atom"));
|
||
|
|
other16 = (reloc2.offset & 0xFFFF);
|
||
|
|
if (thumbReloc)
|
||
|
|
instruction16 = getWordFromThumbMov(instruction);
|
||
|
|
else
|
||
|
|
instruction16 = getWordFromArmMov(instruction);
|
||
|
|
if (top)
|
||
|
|
value = (instruction16 << 16) | other16;
|
||
|
|
else
|
||
|
|
value = (other16 << 16) | instruction16;
|
||
|
|
value = clearThumbBit(value, *target);
|
||
|
|
int64_t ta = (int64_t) value - (toAddress - fromAddress);
|
||
|
|
*addend = ta - offsetInFrom;
|
||
|
|
return std::error_code();
|
||
|
|
} else {
|
||
|
|
uint32_t sectIndex;
|
||
|
|
if (thumbReloc)
|
||
|
|
instruction16 = getWordFromThumbMov(instruction);
|
||
|
|
else
|
||
|
|
instruction16 = getWordFromArmMov(instruction);
|
||
|
|
other16 = (reloc2.offset & 0xFFFF);
|
||
|
|
if (top)
|
||
|
|
value = (instruction16 << 16) | other16;
|
||
|
|
else
|
||
|
|
value = (other16 << 16) | instruction16;
|
||
|
|
if (reloc1.isExtern) {
|
||
|
|
ec = atomFromSymbolIndex(reloc1.symbol, target);
|
||
|
|
if (ec)
|
||
|
|
return ec;
|
||
|
|
*addend = value;
|
||
|
|
} else {
|
||
|
|
if (reloc1.scattered) {
|
||
|
|
toAddress = reloc1.value;
|
||
|
|
sectIndex = 0;
|
||
|
|
} else {
|
||
|
|
toAddress = value;
|
||
|
|
sectIndex = reloc1.symbol;
|
||
|
|
}
|
||
|
|
ec = atomFromAddr(sectIndex, toAddress, target, &offsetInTo);
|
||
|
|
if (ec)
|
||
|
|
return ec;
|
||
|
|
*addend = value - toAddress;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
return std::error_code();
|
||
|
|
}
|
||
|
|
|
||
|
|
void ArchHandler_arm::applyFixup(Reference::KindNamespace ns,
|
||
|
|
Reference::KindArch arch,
|
||
|
|
Reference::KindValue kindValue,
|
||
|
|
uint64_t addend, uint8_t *location,
|
||
|
|
uint64_t fixupAddress, uint64_t targetAddress,
|
||
|
|
uint64_t inAtomAddress) {
|
||
|
|
if (ns != Reference::KindNamespace::mach_o)
|
||
|
|
return;
|
||
|
|
assert(arch == Reference::KindArch::ARM);
|
||
|
|
int32_t *loc32 = reinterpret_cast<int32_t *>(location);
|
||
|
|
int32_t displacement;
|
||
|
|
// FIXME: these writes may need a swap.
|
||
|
|
switch (kindValue) {
|
||
|
|
case thumb_b22:
|
||
|
|
// FIXME
|
||
|
|
break;
|
||
|
|
case thumb_movw:
|
||
|
|
// FIXME
|
||
|
|
break;
|
||
|
|
case thumb_movt:
|
||
|
|
// FIXME
|
||
|
|
break;
|
||
|
|
case thumb_movw_funcRel:
|
||
|
|
// FIXME
|
||
|
|
break;
|
||
|
|
case thumb_movt_funcRel:
|
||
|
|
// FIXME
|
||
|
|
break;
|
||
|
|
case arm_b24:
|
||
|
|
displacement = (targetAddress - (fixupAddress + 8)) + addend;
|
||
|
|
*loc32 = setDisplacementInArmBranch(*loc32, displacement);
|
||
|
|
break;
|
||
|
|
case arm_movw:
|
||
|
|
// FIXME
|
||
|
|
break;
|
||
|
|
case arm_movt:
|
||
|
|
// FIXME
|
||
|
|
break;
|
||
|
|
case arm_movw_funcRel:
|
||
|
|
// FIXME
|
||
|
|
break;
|
||
|
|
case arm_movt_funcRel:
|
||
|
|
// FIXME
|
||
|
|
break;
|
||
|
|
case pointer32:
|
||
|
|
// FIXME
|
||
|
|
break;
|
||
|
|
case delta32:
|
||
|
|
// FIXME
|
||
|
|
break;
|
||
|
|
case lazyPointer:
|
||
|
|
case lazyImmediateLocation:
|
||
|
|
// do nothing
|
||
|
|
break;
|
||
|
|
case invalid:
|
||
|
|
llvm_unreachable("invalid ARM Reference Kind");
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
std::unique_ptr<mach_o::ArchHandler> ArchHandler::create_arm() {
|
||
|
|
return std::unique_ptr<mach_o::ArchHandler>(new ArchHandler_arm());
|
||
|
|
}
|
||
|
|
|
||
|
|
} // namespace mach_o
|
||
|
|
} // namespace lld
|