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//===- ARM64_32.cpp
//----------------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#include "Arch/ARM64Common.h"
#include "InputFiles.h"
#include "Symbols.h"
#include "SyntheticSections.h"
#include "Target.h"
#include "lld/Common/ErrorHandler.h"
#include "llvm/ADT/SmallVector.h"
#include "llvm/ADT/StringRef.h"
#include "llvm/BinaryFormat/MachO.h"
#include "llvm/Support/Endian.h"
#include "llvm/Support/MathExtras.h"
using namespace llvm::MachO;
using namespace llvm::support::endian;
using namespace lld;
using namespace lld::macho;
namespace {
struct ARM64_32 : ARM64Common {
ARM64_32();
void writeStub(uint8_t *buf, const Symbol &, uint64_t) const override;
void writeStubHelperHeader(uint8_t *buf) const override;
void writeStubHelperEntry(uint8_t *buf, const Symbol &,
uint64_t entryAddr) const override;
void writeObjCMsgSendStub(uint8_t *buf, Symbol *sym, uint64_t stubsAddr,
uint64_t &stubOffset, uint64_t selrefVA,
Symbol *objcMsgSend) const override;
};
} // namespace
// These are very similar to ARM64's relocation attributes, except that we don't
// have the BYTE8 flag set.
static constexpr std::array<RelocAttrs, 11> relocAttrsArray{{
#define B(x) RelocAttrBits::x
{"UNSIGNED", B(UNSIGNED) | B(ABSOLUTE) | B(EXTERN) | B(LOCAL) | B(BYTE4)},
{"SUBTRACTOR", B(SUBTRAHEND) | B(EXTERN) | B(BYTE4)},
{"BRANCH26", B(PCREL) | B(EXTERN) | B(BRANCH) | B(BYTE4)},
{"PAGE21", B(PCREL) | B(EXTERN) | B(BYTE4)},
{"PAGEOFF12", B(ABSOLUTE) | B(EXTERN) | B(BYTE4)},
{"GOT_LOAD_PAGE21", B(PCREL) | B(EXTERN) | B(GOT) | B(BYTE4)},
{"GOT_LOAD_PAGEOFF12",
B(ABSOLUTE) | B(EXTERN) | B(GOT) | B(LOAD) | B(BYTE4)},
{"POINTER_TO_GOT", B(PCREL) | B(EXTERN) | B(GOT) | B(POINTER) | B(BYTE4)},
{"TLVP_LOAD_PAGE21", B(PCREL) | B(EXTERN) | B(TLV) | B(BYTE4)},
{"TLVP_LOAD_PAGEOFF12",
B(ABSOLUTE) | B(EXTERN) | B(TLV) | B(LOAD) | B(BYTE4)},
{"ADDEND", B(ADDEND)},
#undef B
}};
// The stub code is fairly similar to ARM64's, except that we load pointers into
// 32-bit 'w' registers, instead of the 64-bit 'x' ones.
static constexpr uint32_t stubCode[] = {
0x90000010, // 00: adrp x16, __la_symbol_ptr@page
0xb9400210, // 04: ldr w16, [x16, __la_symbol_ptr@pageoff]
0xd61f0200, // 08: br x16
};
void ARM64_32::writeStub(uint8_t *buf8, const Symbol &sym,
uint64_t pointerVA) const {
::writeStub(buf8, stubCode, sym, pointerVA);
}
static constexpr uint32_t stubHelperHeaderCode[] = {
0x90000011, // 00: adrp x17, _dyld_private@page
0x91000231, // 04: add x17, x17, _dyld_private@pageoff
0xa9bf47f0, // 08: stp x16/x17, [sp, #-16]!
0x90000010, // 0c: adrp x16, dyld_stub_binder@page
0xb9400210, // 10: ldr w16, [x16, dyld_stub_binder@pageoff]
0xd61f0200, // 14: br x16
};
void ARM64_32::writeStubHelperHeader(uint8_t *buf8) const {
::writeStubHelperHeader<ILP32>(buf8, stubHelperHeaderCode);
}
static constexpr uint32_t stubHelperEntryCode[] = {
0x18000050, // 00: ldr w16, l0
0x14000000, // 04: b stubHelperHeader
0x00000000, // 08: l0: .long 0
};
void ARM64_32::writeStubHelperEntry(uint8_t *buf8, const Symbol &sym,
uint64_t entryVA) const {
::writeStubHelperEntry(buf8, stubHelperEntryCode, sym, entryVA);
}
void ARM64_32::writeObjCMsgSendStub(uint8_t *buf, Symbol *sym,
uint64_t stubsAddr, uint64_t &stubOffset,
uint64_t selrefVA,
Symbol *objcMsgSend) const {
fatal("TODO: implement this");
}
ARM64_32::ARM64_32() : ARM64Common(ILP32()) {
cpuType = CPU_TYPE_ARM64_32;
cpuSubtype = CPU_SUBTYPE_ARM64_V8;
modeDwarfEncoding = 0x04000000; // UNWIND_ARM_MODE_DWARF
subtractorRelocType = GENERIC_RELOC_INVALID; // FIXME
unsignedRelocType = GENERIC_RELOC_INVALID; // FIXME
stubSize = sizeof(stubCode);
stubHelperHeaderSize = sizeof(stubHelperHeaderCode);
stubHelperEntrySize = sizeof(stubHelperEntryCode);
relocAttrs = {relocAttrsArray.data(), relocAttrsArray.size()};
}
TargetInfo *macho::createARM64_32TargetInfo() {
static ARM64_32 t;
return &t;
}
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