123 lines · cpp
1//===- ARM64_32.cpp2//----------------------------------------------------------===//3//4// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.5// See https://llvm.org/LICENSE.txt for license information.6// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception7//8//===----------------------------------------------------------------------===//9 10#include "Arch/ARM64Common.h"11#include "InputFiles.h"12#include "Symbols.h"13#include "Target.h"14 15#include "lld/Common/ErrorHandler.h"16#include "llvm/ADT/SmallVector.h"17#include "llvm/BinaryFormat/MachO.h"18 19using namespace llvm::MachO;20using namespace llvm::support::endian;21using namespace lld;22using namespace lld::macho;23 24namespace {25 26struct ARM64_32 : ARM64Common {27 ARM64_32();28 void writeStub(uint8_t *buf, const Symbol &, uint64_t) const override;29 void writeStubHelperHeader(uint8_t *buf) const override;30 void writeStubHelperEntry(uint8_t *buf, const Symbol &,31 uint64_t entryAddr) const override;32 void writeObjCMsgSendStub(uint8_t *buf, Symbol *sym, uint64_t stubsAddr,33 uint64_t &stubOffset, uint64_t selrefVA,34 Symbol *objcMsgSend) const override;35};36 37} // namespace38 39// These are very similar to ARM64's relocation attributes, except that we don't40// have the BYTE8 flag set.41static constexpr std::array<RelocAttrs, 11> relocAttrsArray{{42#define B(x) RelocAttrBits::x43 {"UNSIGNED", B(UNSIGNED) | B(ABSOLUTE) | B(EXTERN) | B(LOCAL) | B(BYTE4)},44 {"SUBTRACTOR", B(SUBTRAHEND) | B(EXTERN) | B(BYTE4)},45 {"BRANCH26", B(PCREL) | B(EXTERN) | B(BRANCH) | B(BYTE4)},46 {"PAGE21", B(PCREL) | B(EXTERN) | B(BYTE4)},47 {"PAGEOFF12", B(ABSOLUTE) | B(EXTERN) | B(BYTE4)},48 {"GOT_LOAD_PAGE21", B(PCREL) | B(EXTERN) | B(GOT) | B(BYTE4)},49 {"GOT_LOAD_PAGEOFF12",50 B(ABSOLUTE) | B(EXTERN) | B(GOT) | B(LOAD) | B(BYTE4)},51 {"POINTER_TO_GOT", B(PCREL) | B(EXTERN) | B(GOT) | B(POINTER) | B(BYTE4)},52 {"TLVP_LOAD_PAGE21", B(PCREL) | B(EXTERN) | B(TLV) | B(BYTE4)},53 {"TLVP_LOAD_PAGEOFF12",54 B(ABSOLUTE) | B(EXTERN) | B(TLV) | B(LOAD) | B(BYTE4)},55 {"ADDEND", B(ADDEND)},56#undef B57}};58 59// The stub code is fairly similar to ARM64's, except that we load pointers into60// 32-bit 'w' registers, instead of the 64-bit 'x' ones.61 62static constexpr uint32_t stubCode[] = {63 0x90000010, // 00: adrp x16, __la_symbol_ptr@page64 0xb9400210, // 04: ldr w16, [x16, __la_symbol_ptr@pageoff]65 0xd61f0200, // 08: br x1666};67 68void ARM64_32::writeStub(uint8_t *buf8, const Symbol &sym,69 uint64_t pointerVA) const {70 ::writeStub(buf8, stubCode, sym, pointerVA);71}72 73static constexpr uint32_t stubHelperHeaderCode[] = {74 0x90000011, // 00: adrp x17, _dyld_private@page75 0x91000231, // 04: add x17, x17, _dyld_private@pageoff76 0xa9bf47f0, // 08: stp x16/x17, [sp, #-16]!77 0x90000010, // 0c: adrp x16, dyld_stub_binder@page78 0xb9400210, // 10: ldr w16, [x16, dyld_stub_binder@pageoff]79 0xd61f0200, // 14: br x1680};81 82void ARM64_32::writeStubHelperHeader(uint8_t *buf8) const {83 ::writeStubHelperHeader<ILP32>(buf8, stubHelperHeaderCode);84}85 86static constexpr uint32_t stubHelperEntryCode[] = {87 0x18000050, // 00: ldr w16, l088 0x14000000, // 04: b stubHelperHeader89 0x00000000, // 08: l0: .long 090};91 92void ARM64_32::writeStubHelperEntry(uint8_t *buf8, const Symbol &sym,93 uint64_t entryVA) const {94 ::writeStubHelperEntry(buf8, stubHelperEntryCode, sym, entryVA);95}96 97void ARM64_32::writeObjCMsgSendStub(uint8_t *buf, Symbol *sym,98 uint64_t stubsAddr, uint64_t &stubOffset,99 uint64_t selrefVA,100 Symbol *objcMsgSend) const {101 fatal("TODO: implement this");102}103 104ARM64_32::ARM64_32() : ARM64Common(ILP32()) {105 cpuType = CPU_TYPE_ARM64_32;106 cpuSubtype = CPU_SUBTYPE_ARM64_V8;107 108 modeDwarfEncoding = 0x04000000; // UNWIND_ARM_MODE_DWARF109 subtractorRelocType = GENERIC_RELOC_INVALID; // FIXME110 unsignedRelocType = GENERIC_RELOC_INVALID; // FIXME111 112 stubSize = sizeof(stubCode);113 stubHelperHeaderSize = sizeof(stubHelperHeaderCode);114 stubHelperEntrySize = sizeof(stubHelperEntryCode);115 116 relocAttrs = {relocAttrsArray.data(), relocAttrsArray.size()};117}118 119TargetInfo *macho::createARM64_32TargetInfo() {120 static ARM64_32 t;121 return &t;122}123