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+//===-- ARMWinEHPrinter.cpp - Windows on ARM EH Data Printer ----*- C++ -*-===//
+//
+// 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
+//
+//===----------------------------------------------------------------------===//
+
+// Windows on ARM uses a series of serialised data structures (RuntimeFunction)
+// to create a table of information for unwinding. In order to conserve space,
+// there are two different ways that this data is represented.
+//
+// For functions with canonical forms for the prologue and epilogue, the data
+// can be stored in a "packed" form. In this case, the data is packed into the
+// RuntimeFunction's remaining 30-bits and can fully describe the entire frame.
+//
+// +---------------------------------------+
+// | Function Entry Address |
+// +---------------------------------------+
+// | Packed Form Data |
+// +---------------------------------------+
+//
+// This layout is parsed by Decoder::dumpPackedEntry. No unwind bytecode is
+// associated with such a frame as they can be derived from the provided data.
+// The decoder does not synthesize this data as it is unnecessary for the
+// purposes of validation, with the synthesis being required only by a proper
+// unwinder.
+//
+// For functions that are large or do not match canonical forms, the data is
+// split up into two portions, with the actual data residing in the "exception
+// data" table (.xdata) with a reference to the entry from the "procedure data"
+// (.pdata) entry.
+//
+// The exception data contains information about the frame setup, all of the
+// epilogue scopes (for functions for which there are multiple exit points) and
+// the associated exception handler. Additionally, the entry contains byte-code
+// describing how to unwind the function (c.f. Decoder::decodeOpcodes).
+//
+// +---------------------------------------+
+// | Function Entry Address |
+// +---------------------------------------+
+// | Exception Data Entry Address |
+// +---------------------------------------+
+//
+// This layout is parsed by Decoder::dumpUnpackedEntry. Such an entry must
+// first resolve the exception data entry address. This structure
+// (ExceptionDataRecord) has a variable sized header
+// (c.f. ARM::WinEH::HeaderWords) and encodes most of the same information as
+// the packed form. However, because this information is insufficient to
+// synthesize the unwinding, there are associated unwinding bytecode which make
+// up the bulk of the Decoder.
+//
+// The decoder itself is table-driven, using the first byte to determine the
+// opcode and dispatching to the associated printing routine. The bytecode
+// itself is a variable length instruction encoding that can fully describe the
+// state of the stack and the necessary operations for unwinding to the
+// beginning of the frame.
+//
+// The byte-code maintains a 1-1 instruction mapping, indicating both the width
+// of the instruction (Thumb2 instructions are variable length, 16 or 32 bits
+// wide) allowing the program to unwind from any point in the prologue, body, or
+// epilogue of the function.
+
+#include "ARMWinEHPrinter.h"
+#include "Error.h"
+#include "llvm/ADT/STLExtras.h"
+#include "llvm/ADT/StringExtras.h"
+#include "llvm/Support/ARMWinEH.h"
+#include "llvm/Support/Format.h"
+
+using namespace llvm;
+using namespace llvm::object;
+using namespace llvm::support;
+
+namespace llvm {
+raw_ostream &operator<<(raw_ostream &OS, const ARM::WinEH::ReturnType &RT) {
+ switch (RT) {
+ case ARM::WinEH::ReturnType::RT_POP:
+ OS << "pop {pc}";
+ break;
+ case ARM::WinEH::ReturnType::RT_B:
+ OS << "b target";
+ break;
+ case ARM::WinEH::ReturnType::RT_BW:
+ OS << "b.w target";
+ break;
+ case ARM::WinEH::ReturnType::RT_NoEpilogue:
+ OS << "(no epilogue)";
+ break;
+ }
+ return OS;
+}
+}
+
+static std::string formatSymbol(StringRef Name, uint64_t Address,
+ uint64_t Offset = 0) {
+ std::string Buffer;
+ raw_string_ostream OS(Buffer);
+
+ if (!Name.empty())
+ OS << Name << " ";
+
+ if (Offset)
+ OS << format("+0x%X (0x%" PRIX64 ")", Offset, Address);
+ else if (!Name.empty())
+ OS << format("(0x%" PRIX64 ")", Address);
+ else
+ OS << format("0x%" PRIX64, Address);
+
+ return OS.str();
+}
+
+namespace llvm {
+namespace ARM {
+namespace WinEH {
+const size_t Decoder::PDataEntrySize = sizeof(RuntimeFunction);
+
+// TODO name the uops more appropriately
+const Decoder::RingEntry Decoder::Ring[] = {
+ { 0x80, 0x00, 1, &Decoder::opcode_0xxxxxxx }, // UOP_STACK_FREE (16-bit)
+ { 0xc0, 0x80, 2, &Decoder::opcode_10Lxxxxx }, // UOP_POP (32-bit)
+ { 0xf0, 0xc0, 1, &Decoder::opcode_1100xxxx }, // UOP_STACK_SAVE (16-bit)
+ { 0xf8, 0xd0, 1, &Decoder::opcode_11010Lxx }, // UOP_POP (16-bit)
+ { 0xf8, 0xd8, 1, &Decoder::opcode_11011Lxx }, // UOP_POP (32-bit)
+ { 0xf8, 0xe0, 1, &Decoder::opcode_11100xxx }, // UOP_VPOP (32-bit)
+ { 0xfc, 0xe8, 2, &Decoder::opcode_111010xx }, // UOP_STACK_FREE (32-bit)
+ { 0xfe, 0xec, 2, &Decoder::opcode_1110110L }, // UOP_POP (16-bit)
+ { 0xff, 0xee, 2, &Decoder::opcode_11101110 }, // UOP_MICROSOFT_SPECIFIC (16-bit)
+ // UOP_PUSH_MACHINE_FRAME
+ // UOP_PUSH_CONTEXT
+ // UOP_PUSH_TRAP_FRAME
+ // UOP_REDZONE_RESTORE_LR
+ { 0xff, 0xef, 2, &Decoder::opcode_11101111 }, // UOP_LDRPC_POSTINC (32-bit)
+ { 0xff, 0xf5, 2, &Decoder::opcode_11110101 }, // UOP_VPOP (32-bit)
+ { 0xff, 0xf6, 2, &Decoder::opcode_11110110 }, // UOP_VPOP (32-bit)
+ { 0xff, 0xf7, 3, &Decoder::opcode_11110111 }, // UOP_STACK_RESTORE (16-bit)
+ { 0xff, 0xf8, 4, &Decoder::opcode_11111000 }, // UOP_STACK_RESTORE (16-bit)
+ { 0xff, 0xf9, 3, &Decoder::opcode_11111001 }, // UOP_STACK_RESTORE (32-bit)
+ { 0xff, 0xfa, 4, &Decoder::opcode_11111010 }, // UOP_STACK_RESTORE (32-bit)
+ { 0xff, 0xfb, 1, &Decoder::opcode_11111011 }, // UOP_NOP (16-bit)
+ { 0xff, 0xfc, 1, &Decoder::opcode_11111100 }, // UOP_NOP (32-bit)
+ { 0xff, 0xfd, 1, &Decoder::opcode_11111101 }, // UOP_NOP (16-bit) / END
+ { 0xff, 0xfe, 1, &Decoder::opcode_11111110 }, // UOP_NOP (32-bit) / END
+ { 0xff, 0xff, 1, &Decoder::opcode_11111111 }, // UOP_END
+};
+
+
+// Unwind opcodes for ARM64.
+// https://docs.microsoft.com/en-us/cpp/build/arm64-exception-handling
+const Decoder::RingEntry Decoder::Ring64[] = {
+ { 0xe0, 0x00, 1, &Decoder::opcode_alloc_s },
+ { 0xe0, 0x20, 1, &Decoder::opcode_save_r19r20_x },
+ { 0xc0, 0x40, 1, &Decoder::opcode_save_fplr },
+ { 0xc0, 0x80, 1, &Decoder::opcode_save_fplr_x },
+ { 0xf8, 0xc0, 2, &Decoder::opcode_alloc_m },
+ { 0xfc, 0xc8, 2, &Decoder::opcode_save_regp },
+ { 0xfc, 0xcc, 2, &Decoder::opcode_save_regp_x },
+ { 0xfc, 0xd0, 2, &Decoder::opcode_save_reg },
+ { 0xfe, 0xd4, 2, &Decoder::opcode_save_reg_x },
+ { 0xfe, 0xd6, 2, &Decoder::opcode_save_lrpair },
+ { 0xfe, 0xd8, 2, &Decoder::opcode_save_fregp },
+ { 0xfe, 0xda, 2, &Decoder::opcode_save_fregp_x },
+ { 0xfe, 0xdc, 2, &Decoder::opcode_save_freg },
+ { 0xff, 0xde, 2, &Decoder::opcode_save_freg_x },
+ { 0xff, 0xe0, 4, &Decoder::opcode_alloc_l },
+ { 0xff, 0xe1, 1, &Decoder::opcode_setfp },
+ { 0xff, 0xe2, 2, &Decoder::opcode_addfp },
+ { 0xff, 0xe3, 1, &Decoder::opcode_nop },
+ { 0xff, 0xe4, 1, &Decoder::opcode_end },
+ { 0xff, 0xe5, 1, &Decoder::opcode_end_c },
+};
+
+void Decoder::printRegisters(const std::pair<uint16_t, uint32_t> &RegisterMask) {
+ static const char * const GPRRegisterNames[16] = {
+ "r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7", "r8", "r9", "r10",
+ "r11", "ip", "sp", "lr", "pc",
+ };
+
+ const uint16_t GPRMask = std::get<0>(RegisterMask);
+ const uint16_t VFPMask = std::get<1>(RegisterMask);
+
+ OS << '{';
+ bool Comma = false;
+ for (unsigned RI = 0, RE = 11; RI < RE; ++RI) {
+ if (GPRMask & (1 << RI)) {
+ if (Comma)
+ OS << ", ";
+ OS << GPRRegisterNames[RI];
+ Comma = true;
+ }
+ }
+ for (unsigned RI = 0, RE = 32; RI < RE; ++RI) {
+ if (VFPMask & (1 << RI)) {
+ if (Comma)
+ OS << ", ";
+ OS << "d" << unsigned(RI);
+ Comma = true;
+ }
+ }
+ for (unsigned RI = 11, RE = 16; RI < RE; ++RI) {
+ if (GPRMask & (1 << RI)) {
+ if (Comma)
+ OS << ", ";
+ OS << GPRRegisterNames[RI];
+ Comma = true;
+ }
+ }
+ OS << '}';
+}
+
+ErrorOr<object::SectionRef>
+Decoder::getSectionContaining(const COFFObjectFile &COFF, uint64_t VA) {
+ for (const auto &Section : COFF.sections()) {
+ uint64_t Address = Section.getAddress();
+ uint64_t Size = Section.getSize();
+
+ if (VA >= Address && (VA - Address) <= Size)
+ return Section;
+ }
+ return readobj_error::unknown_symbol;
+}
+
+ErrorOr<object::SymbolRef> Decoder::getSymbol(const COFFObjectFile &COFF,
+ uint64_t VA, bool FunctionOnly) {
+ for (const auto &Symbol : COFF.symbols()) {
+ Expected<SymbolRef::Type> Type = Symbol.getType();
+ if (!Type)
+ return errorToErrorCode(Type.takeError());
+ if (FunctionOnly && *Type != SymbolRef::ST_Function)
+ continue;
+
+ Expected<uint64_t> Address = Symbol.getAddress();
+ if (!Address)
+ return errorToErrorCode(Address.takeError());
+ if (*Address == VA)
+ return Symbol;
+ }
+ return readobj_error::unknown_symbol;
+}
+
+ErrorOr<SymbolRef> Decoder::getRelocatedSymbol(const COFFObjectFile &,
+ const SectionRef &Section,
+ uint64_t Offset) {
+ for (const auto &Relocation : Section.relocations()) {
+ uint64_t RelocationOffset = Relocation.getOffset();
+ if (RelocationOffset == Offset)
+ return *Relocation.getSymbol();
+ }
+ return readobj_error::unknown_symbol;
+}
+
+bool Decoder::opcode_0xxxxxxx(const uint8_t *OC, unsigned &Offset,
+ unsigned Length, bool Prologue) {
+ uint8_t Imm = OC[Offset] & 0x7f;
+ SW.startLine() << format("0x%02x ; %s sp, #(%u * 4)\n",
+ OC[Offset],
+ static_cast<const char *>(Prologue ? "sub" : "add"),
+ Imm);
+ ++Offset;
+ return false;
+}
+
+bool Decoder::opcode_10Lxxxxx(const uint8_t *OC, unsigned &Offset,
+ unsigned Length, bool Prologue) {
+ unsigned Link = (OC[Offset] & 0x20) >> 5;
+ uint16_t RegisterMask = (Link << (Prologue ? 14 : 15))
+ | ((OC[Offset + 0] & 0x1f) << 8)
+ | ((OC[Offset + 1] & 0xff) << 0);
+ assert((~RegisterMask & (1 << 13)) && "sp must not be set");
+ assert((~RegisterMask & (1 << (Prologue ? 15 : 14))) && "pc must not be set");
+
+ SW.startLine() << format("0x%02x 0x%02x ; %s.w ",
+ OC[Offset + 0], OC[Offset + 1],
+ Prologue ? "push" : "pop");
+ printRegisters(std::make_pair(RegisterMask, 0));
+ OS << '\n';
+
+ Offset += 2;
+ return false;
+}
+
+bool Decoder::opcode_1100xxxx(const uint8_t *OC, unsigned &Offset,
+ unsigned Length, bool Prologue) {
+ if (Prologue)
+ SW.startLine() << format("0x%02x ; mov r%u, sp\n",
+ OC[Offset], OC[Offset] & 0xf);
+ else
+ SW.startLine() << format("0x%02x ; mov sp, r%u\n",
+ OC[Offset], OC[Offset] & 0xf);
+ ++Offset;
+ return false;
+}
+
+bool Decoder::opcode_11010Lxx(const uint8_t *OC, unsigned &Offset,
+ unsigned Length, bool Prologue) {
+ unsigned Link = (OC[Offset] & 0x4) >> 3;
+ unsigned Count = (OC[Offset] & 0x3);
+
+ uint16_t GPRMask = (Link << (Prologue ? 14 : 15))
+ | (((1 << (Count + 1)) - 1) << 4);
+
+ SW.startLine() << format("0x%02x ; %s ", OC[Offset],
+ Prologue ? "push" : "pop");
+ printRegisters(std::make_pair(GPRMask, 0));
+ OS << '\n';
+
+ ++Offset;
+ return false;
+}
+
+bool Decoder::opcode_11011Lxx(const uint8_t *OC, unsigned &Offset,
+ unsigned Length, bool Prologue) {
+ unsigned Link = (OC[Offset] & 0x4) >> 2;
+ unsigned Count = (OC[Offset] & 0x3) + 4;
+
+ uint16_t GPRMask = (Link << (Prologue ? 14 : 15))
+ | (((1 << (Count + 1)) - 1) << 4);
+
+ SW.startLine() << format("0x%02x ; %s.w ", OC[Offset],
+ Prologue ? "push" : "pop");
+ printRegisters(std::make_pair(GPRMask, 0));
+ OS << '\n';
+
+ ++Offset;
+ return false;
+}
+
+bool Decoder::opcode_11100xxx(const uint8_t *OC, unsigned &Offset,
+ unsigned Length, bool Prologue) {
+ unsigned High = (OC[Offset] & 0x7);
+ uint32_t VFPMask = (((1 << (High + 1)) - 1) << 8);
+
+ SW.startLine() << format("0x%02x ; %s ", OC[Offset],
+ Prologue ? "vpush" : "vpop");
+ printRegisters(std::make_pair(0, VFPMask));
+ OS << '\n';
+
+ ++Offset;
+ return false;
+}
+
+bool Decoder::opcode_111010xx(const uint8_t *OC, unsigned &Offset,
+ unsigned Length, bool Prologue) {
+ uint16_t Imm = ((OC[Offset + 0] & 0x03) << 8) | ((OC[Offset + 1] & 0xff) << 0);
+
+ SW.startLine() << format("0x%02x 0x%02x ; %s.w sp, #(%u * 4)\n",
+ OC[Offset + 0], OC[Offset + 1],
+ static_cast<const char *>(Prologue ? "sub" : "add"),
+ Imm);
+
+ Offset += 2;
+ return false;
+}
+
+bool Decoder::opcode_1110110L(const uint8_t *OC, unsigned &Offset,
+ unsigned Length, bool Prologue) {
+ uint8_t GPRMask = ((OC[Offset + 0] & 0x01) << (Prologue ? 14 : 15))
+ | ((OC[Offset + 1] & 0xff) << 0);
+
+ SW.startLine() << format("0x%02x 0x%02x ; %s ", OC[Offset + 0],
+ OC[Offset + 1], Prologue ? "push" : "pop");
+ printRegisters(std::make_pair(GPRMask, 0));
+ OS << '\n';
+
+ Offset += 2;
+ return false;
+}
+
+bool Decoder::opcode_11101110(const uint8_t *OC, unsigned &Offset,
+ unsigned Length, bool Prologue) {
+ assert(!Prologue && "may not be used in prologue");
+
+ if (OC[Offset + 1] & 0xf0)
+ SW.startLine() << format("0x%02x 0x%02x ; reserved\n",
+ OC[Offset + 0], OC[Offset + 1]);
+ else
+ SW.startLine()
+ << format("0x%02x 0x%02x ; microsoft-specific (type: %u)\n",
+ OC[Offset + 0], OC[Offset + 1], OC[Offset + 1] & 0x0f);
+
+ Offset += 2;
+ return false;
+}
+
+bool Decoder::opcode_11101111(const uint8_t *OC, unsigned &Offset,
+ unsigned Length, bool Prologue) {
+ assert(!Prologue && "may not be used in prologue");
+
+ if (OC[Offset + 1] & 0xf0)
+ SW.startLine() << format("0x%02x 0x%02x ; reserved\n",
+ OC[Offset + 0], OC[Offset + 1]);
+ else
+ SW.startLine()
+ << format("0x%02x 0x%02x ; ldr.w lr, [sp], #%u\n",
+ OC[Offset + 0], OC[Offset + 1], OC[Offset + 1] << 2);
+
+ Offset += 2;
+ return false;
+}
+
+bool Decoder::opcode_11110101(const uint8_t *OC, unsigned &Offset,
+ unsigned Length, bool Prologue) {
+ unsigned Start = (OC[Offset + 1] & 0xf0) >> 4;
+ unsigned End = (OC[Offset + 1] & 0x0f) >> 0;
+ uint32_t VFPMask = ((1 << (End - Start)) - 1) << Start;
+
+ SW.startLine() << format("0x%02x 0x%02x ; %s ", OC[Offset + 0],
+ OC[Offset + 1], Prologue ? "vpush" : "vpop");
+ printRegisters(std::make_pair(0, VFPMask));
+ OS << '\n';
+
+ Offset += 2;
+ return false;
+}
+
+bool Decoder::opcode_11110110(const uint8_t *OC, unsigned &Offset,
+ unsigned Length, bool Prologue) {
+ unsigned Start = (OC[Offset + 1] & 0xf0) >> 4;
+ unsigned End = (OC[Offset + 1] & 0x0f) >> 0;
+ uint32_t VFPMask = ((1 << (End - Start)) - 1) << 16;
+
+ SW.startLine() << format("0x%02x 0x%02x ; %s ", OC[Offset + 0],
+ OC[Offset + 1], Prologue ? "vpush" : "vpop");
+ printRegisters(std::make_pair(0, VFPMask));
+ OS << '\n';
+
+ Offset += 2;
+ return false;
+}
+
+bool Decoder::opcode_11110111(const uint8_t *OC, unsigned &Offset,
+ unsigned Length, bool Prologue) {
+ uint32_t Imm = (OC[Offset + 1] << 8) | (OC[Offset + 2] << 0);
+
+ SW.startLine() << format("0x%02x 0x%02x 0x%02x ; %s sp, sp, #(%u * 4)\n",
+ OC[Offset + 0], OC[Offset + 1], OC[Offset + 2],
+ static_cast<const char *>(Prologue ? "sub" : "add"),
+ Imm);
+
+ Offset += 3;
+ return false;
+}
+
+bool Decoder::opcode_11111000(const uint8_t *OC, unsigned &Offset,
+ unsigned Length, bool Prologue) {
+ uint32_t Imm = (OC[Offset + 1] << 16)
+ | (OC[Offset + 2] << 8)
+ | (OC[Offset + 3] << 0);
+
+ SW.startLine()
+ << format("0x%02x 0x%02x 0x%02x 0x%02x ; %s sp, sp, #(%u * 4)\n",
+ OC[Offset + 0], OC[Offset + 1], OC[Offset + 2], OC[Offset + 3],
+ static_cast<const char *>(Prologue ? "sub" : "add"), Imm);
+
+ Offset += 4;
+ return false;
+}
+
+bool Decoder::opcode_11111001(const uint8_t *OC, unsigned &Offset,
+ unsigned Length, bool Prologue) {
+ uint32_t Imm = (OC[Offset + 1] << 8) | (OC[Offset + 2] << 0);
+
+ SW.startLine()
+ << format("0x%02x 0x%02x 0x%02x ; %s.w sp, sp, #(%u * 4)\n",
+ OC[Offset + 0], OC[Offset + 1], OC[Offset + 2],
+ static_cast<const char *>(Prologue ? "sub" : "add"), Imm);
+
+ Offset += 3;
+ return false;
+}
+
+bool Decoder::opcode_11111010(const uint8_t *OC, unsigned &Offset,
+ unsigned Length, bool Prologue) {
+ uint32_t Imm = (OC[Offset + 1] << 16)
+ | (OC[Offset + 2] << 8)
+ | (OC[Offset + 3] << 0);
+
+ SW.startLine()
+ << format("0x%02x 0x%02x 0x%02x 0x%02x ; %s.w sp, sp, #(%u * 4)\n",
+ OC[Offset + 0], OC[Offset + 1], OC[Offset + 2], OC[Offset + 3],
+ static_cast<const char *>(Prologue ? "sub" : "add"), Imm);
+
+ Offset += 4;
+ return false;
+}
+
+bool Decoder::opcode_11111011(const uint8_t *OC, unsigned &Offset,
+ unsigned Length, bool Prologue) {
+ SW.startLine() << format("0x%02x ; nop\n", OC[Offset]);
+ ++Offset;
+ return false;
+}
+
+bool Decoder::opcode_11111100(const uint8_t *OC, unsigned &Offset,
+ unsigned Length, bool Prologue) {
+ SW.startLine() << format("0x%02x ; nop.w\n", OC[Offset]);
+ ++Offset;
+ return false;
+}
+
+bool Decoder::opcode_11111101(const uint8_t *OC, unsigned &Offset,
+ unsigned Length, bool Prologue) {
+ SW.startLine() << format("0x%02x ; b\n", OC[Offset]);
+ ++Offset;
+ return true;
+}
+
+bool Decoder::opcode_11111110(const uint8_t *OC, unsigned &Offset,
+ unsigned Length, bool Prologue) {
+ SW.startLine() << format("0x%02x ; b.w\n", OC[Offset]);
+ ++Offset;
+ return true;
+}
+
+bool Decoder::opcode_11111111(const uint8_t *OC, unsigned &Offset,
+ unsigned Length, bool Prologue) {
+ ++Offset;
+ return true;
+}
+
+// ARM64 unwind codes start here.
+bool Decoder::opcode_alloc_s(const uint8_t *OC, unsigned &Offset,
+ unsigned Length, bool Prologue) {
+ uint32_t NumBytes = (OC[Offset] & 0x1F) << 4;
+ SW.startLine() << format("0x%02x ; %s sp, #%u\n", OC[Offset],
+ static_cast<const char *>(Prologue ? "sub" : "add"),
+ NumBytes);
+ ++Offset;
+ return false;
+}
+
+bool Decoder::opcode_save_r19r20_x(const uint8_t *OC, unsigned &Offset,
+ unsigned Length, bool Prologue) {
+ uint32_t Off = (OC[Offset] & 0x1F) << 3;
+ if (Prologue)
+ SW.startLine() << format(
+ "0x%02x ; stp x19, x20, [sp, #-%u]!\n", OC[Offset], Off);
+ else
+ SW.startLine() << format(
+ "0x%02x ; ldp x19, x20, [sp], #%u\n", OC[Offset], Off);
+ ++Offset;
+ return false;
+}
+
+bool Decoder::opcode_save_fplr(const uint8_t *OC, unsigned &Offset,
+ unsigned Length, bool Prologue) {
+ uint32_t Off = (OC[Offset] & 0x3F) << 3;
+ SW.startLine() << format(
+ "0x%02x ; %s x29, x30, [sp, #%u]\n", OC[Offset],
+ static_cast<const char *>(Prologue ? "stp" : "ldp"), Off);
+ ++Offset;
+ return false;
+}
+
+bool Decoder::opcode_save_fplr_x(const uint8_t *OC, unsigned &Offset,
+ unsigned Length, bool Prologue) {
+ uint32_t Off = ((OC[Offset] & 0x3F) + 1) << 3;
+ if (Prologue)
+ SW.startLine() << format(
+ "0x%02x ; stp x29, x30, [sp, #-%u]!\n", OC[Offset], Off);
+ else
+ SW.startLine() << format(
+ "0x%02x ; ldp x29, x30, [sp], #%u\n", OC[Offset], Off);
+ ++Offset;
+ return false;
+}
+
+bool Decoder::opcode_alloc_m(const uint8_t *OC, unsigned &Offset,
+ unsigned Length, bool Prologue) {
+ uint32_t NumBytes = ((OC[Offset] & 0x07) << 8);
+ NumBytes |= (OC[Offset + 1] & 0xFF);
+ NumBytes <<= 4;
+ SW.startLine() << format("0x%02x%02x ; %s sp, #%u\n",
+ OC[Offset], OC[Offset + 1],
+ static_cast<const char *>(Prologue ? "sub" : "add"),
+ NumBytes);
+ Offset += 2;
+ return false;
+}
+
+bool Decoder::opcode_save_regp(const uint8_t *OC, unsigned &Offset,
+ unsigned Length, bool Prologue) {
+ uint32_t Reg = ((OC[Offset] & 0x03) << 8);
+ Reg |= (OC[Offset + 1] & 0xC0);
+ Reg >>= 6;
+ Reg += 19;
+ uint32_t Off = (OC[Offset + 1] & 0x3F) << 3;
+ SW.startLine() << format(
+ "0x%02x%02x ; %s x%u, x%u, [sp, #%u]\n",
+ OC[Offset], OC[Offset + 1],
+ static_cast<const char *>(Prologue ? "stp" : "ldp"), Reg, Reg + 1, Off);
+ Offset += 2;
+ return false;
+}
+
+bool Decoder::opcode_save_regp_x(const uint8_t *OC, unsigned &Offset,
+ unsigned Length, bool Prologue) {
+ uint32_t Reg = ((OC[Offset] & 0x03) << 8);
+ Reg |= (OC[Offset + 1] & 0xC0);
+ Reg >>= 6;
+ Reg += 19;
+ uint32_t Off = ((OC[Offset + 1] & 0x3F) + 1) << 3;
+ if (Prologue)
+ SW.startLine() << format(
+ "0x%02x%02x ; stp x%u, x%u, [sp, #-%u]!\n",
+ OC[Offset], OC[Offset + 1], Reg,
+ Reg + 1, Off);
+ else
+ SW.startLine() << format(
+ "0x%02x%02x ; ldp x%u, x%u, [sp], #%u\n",
+ OC[Offset], OC[Offset + 1], Reg,
+ Reg + 1, Off);
+ Offset += 2;
+ return false;
+}
+
+bool Decoder::opcode_save_reg(const uint8_t *OC, unsigned &Offset,
+ unsigned Length, bool Prologue) {
+ uint32_t Reg = (OC[Offset] & 0x03) << 8;
+ Reg |= (OC[Offset + 1] & 0xC0);
+ Reg >>= 6;
+ Reg += 19;
+ uint32_t Off = (OC[Offset + 1] & 0x3F) << 3;
+ SW.startLine() << format("0x%02x%02x ; %s x%u, [sp, #%u]\n",
+ OC[Offset], OC[Offset + 1],
+ static_cast<const char *>(Prologue ? "str" : "ldr"),
+ Reg, Off);
+ Offset += 2;
+ return false;
+}
+
+bool Decoder::opcode_save_reg_x(const uint8_t *OC, unsigned &Offset,
+ unsigned Length, bool Prologue) {
+ uint32_t Reg = (OC[Offset] & 0x01) << 8;
+ Reg |= (OC[Offset + 1] & 0xE0);
+ Reg >>= 5;
+ Reg += 19;
+ uint32_t Off = ((OC[Offset + 1] & 0x1F) + 1) << 3;
+ if (Prologue)
+ SW.startLine() << format("0x%02x%02x ; str x%u, [sp, #%u]!\n",
+ OC[Offset], OC[Offset + 1], Reg, Off);
+ else
+ SW.startLine() << format("0x%02x%02x ; ldr x%u, [sp], #%u\n",
+ OC[Offset], OC[Offset + 1], Reg, Off);
+ Offset += 2;
+ return false;
+}
+
+bool Decoder::opcode_save_lrpair(const uint8_t *OC, unsigned &Offset,
+ unsigned Length, bool Prologue) {
+ uint32_t Reg = (OC[Offset] & 0x01) << 8;
+ Reg |= (OC[Offset + 1] & 0xC0);
+ Reg >>= 6;
+ Reg *= 2;
+ Reg += 19;
+ uint32_t Off = (OC[Offset + 1] & 0x3F) << 3;
+ SW.startLine() << format("0x%02x%02x ; %s x%u, lr, [sp, #%u]\n",
+ OC[Offset], OC[Offset + 1],
+ static_cast<const char *>(Prologue ? "stp" : "ldp"),
+ Reg, Off);
+ Offset += 2;
+ return false;
+}
+
+bool Decoder::opcode_save_fregp(const uint8_t *OC, unsigned &Offset,
+ unsigned Length, bool Prologue) {
+ uint32_t Reg = (OC[Offset] & 0x01) << 8;
+ Reg |= (OC[Offset + 1] & 0xC0);
+ Reg >>= 6;
+ Reg += 8;
+ uint32_t Off = (OC[Offset + 1] & 0x3F) << 3;
+ SW.startLine() << format("0x%02x%02x ; %s d%u, d%u, [sp, #%u]\n",
+ OC[Offset], OC[Offset + 1],
+ static_cast<const char *>(Prologue ? "stp" : "ldp"),
+ Reg, Reg + 1, Off);
+ Offset += 2;
+ return false;
+}
+
+bool Decoder::opcode_save_fregp_x(const uint8_t *OC, unsigned &Offset,
+ unsigned Length, bool Prologue) {
+ uint32_t Reg = (OC[Offset] & 0x01) << 8;
+ Reg |= (OC[Offset + 1] & 0xC0);
+ Reg >>= 6;
+ Reg += 8;
+ uint32_t Off = ((OC[Offset + 1] & 0x3F) + 1) << 3;
+ if (Prologue)
+ SW.startLine() << format(
+ "0x%02x%02x ; stp d%u, d%u, [sp, #-%u]!\n", OC[Offset],
+ OC[Offset + 1], Reg, Reg + 1, Off);
+ else
+ SW.startLine() << format(
+ "0x%02x%02x ; ldp d%u, d%u, [sp], #%u\n", OC[Offset],
+ OC[Offset + 1], Reg, Reg + 1, Off);
+ Offset += 2;
+ return false;
+}
+
+bool Decoder::opcode_save_freg(const uint8_t *OC, unsigned &Offset,
+ unsigned Length, bool Prologue) {
+ uint32_t Reg = (OC[Offset] & 0x01) << 8;
+ Reg |= (OC[Offset + 1] & 0xC0);
+ Reg >>= 6;
+ Reg += 8;
+ uint32_t Off = (OC[Offset + 1] & 0x3F) << 3;
+ SW.startLine() << format("0x%02x%02x ; %s d%u, [sp, #%u]\n",
+ OC[Offset], OC[Offset + 1],
+ static_cast<const char *>(Prologue ? "str" : "ldr"),
+ Reg, Off);
+ Offset += 2;
+ return false;
+}
+
+bool Decoder::opcode_save_freg_x(const uint8_t *OC, unsigned &Offset,
+ unsigned Length, bool Prologue) {
+ uint32_t Reg = ((OC[Offset + 1] & 0xE0) >> 5) + 8;
+ uint32_t Off = ((OC[Offset + 1] & 0x1F) + 1) << 3;
+ if (Prologue)
+ SW.startLine() << format(
+ "0x%02x%02x ; str d%u, [sp, #-%u]!\n", OC[Offset],
+ OC[Offset + 1], Reg, Off);
+ else
+ SW.startLine() << format(
+ "0x%02x%02x ; ldr d%u, [sp], #%u\n", OC[Offset],
+ OC[Offset + 1], Reg, Off);
+ Offset += 2;
+ return false;
+}
+
+bool Decoder::opcode_alloc_l(const uint8_t *OC, unsigned &Offset,
+ unsigned Length, bool Prologue) {
+ unsigned Off =
+ (OC[Offset + 1] << 16) | (OC[Offset + 2] << 8) | (OC[Offset + 3] << 0);
+ Off <<= 4;
+ SW.startLine() << format(
+ "0x%02x%02x%02x%02x ; %s sp, #%u\n", OC[Offset], OC[Offset + 1],
+ OC[Offset + 2], OC[Offset + 3],
+ static_cast<const char *>(Prologue ? "sub" : "add"), Off);
+ Offset += 4;
+ return false;
+}
+
+bool Decoder::opcode_setfp(const uint8_t *OC, unsigned &Offset, unsigned Length,
+ bool Prologue) {
+ SW.startLine() << format("0x%02x ; mov fp, sp\n", OC[Offset]);
+ ++Offset;
+ return false;
+}
+
+bool Decoder::opcode_addfp(const uint8_t *OC, unsigned &Offset, unsigned Length,
+ bool Prologue) {
+ unsigned NumBytes = OC[Offset + 1] << 3;
+ SW.startLine() << format("0x%02x%02x ; add fp, sp, #%u\n",
+ OC[Offset], OC[Offset + 1], NumBytes);
+ Offset += 2;
+ return false;
+}
+
+bool Decoder::opcode_nop(const uint8_t *OC, unsigned &Offset, unsigned Length,
+ bool Prologue) {
+ SW.startLine() << format("0x%02x ; nop\n", OC[Offset]);
+ ++Offset;
+ return false;
+}
+
+bool Decoder::opcode_end(const uint8_t *OC, unsigned &Offset, unsigned Length,
+ bool Prologue) {
+ SW.startLine() << format("0x%02x ; end\n", OC[Offset]);
+ ++Offset;
+ return true;
+}
+
+bool Decoder::opcode_end_c(const uint8_t *OC, unsigned &Offset, unsigned Length,
+ bool Prologue) {
+ SW.startLine() << format("0x%02x ; end_c\n", OC[Offset]);
+ ++Offset;
+ return true;
+}
+
+void Decoder::decodeOpcodes(ArrayRef<uint8_t> Opcodes, unsigned Offset,
+ bool Prologue) {
+ assert((!Prologue || Offset == 0) && "prologue should always use offset 0");
+ const RingEntry* DecodeRing = isAArch64 ? Ring64 : Ring;
+ bool Terminated = false;
+ for (unsigned OI = Offset, OE = Opcodes.size(); !Terminated && OI < OE; ) {
+ for (unsigned DI = 0;; ++DI) {
+ if ((isAArch64 && (DI >= array_lengthof(Ring64))) ||
+ (!isAArch64 && (DI >= array_lengthof(Ring)))) {
+ SW.startLine() << format("0x%02x ; Bad opcode!\n",
+ Opcodes.data()[OI]);
+ ++OI;
+ break;
+ }
+
+ if ((Opcodes[OI] & DecodeRing[DI].Mask) == DecodeRing[DI].Value) {
+ if (OI + DecodeRing[DI].Length > OE) {
+ SW.startLine() << format("Opcode 0x%02x goes past the unwind data\n",
+ Opcodes[OI]);
+ OI += DecodeRing[DI].Length;
+ break;
+ }
+ Terminated =
+ (this->*DecodeRing[DI].Routine)(Opcodes.data(), OI, 0, Prologue);
+ break;
+ }
+ }
+ }
+}
+
+bool Decoder::dumpXDataRecord(const COFFObjectFile &COFF,
+ const SectionRef &Section,
+ uint64_t FunctionAddress, uint64_t VA) {
+ ArrayRef<uint8_t> Contents;
+ if (COFF.getSectionContents(COFF.getCOFFSection(Section), Contents))
+ return false;
+
+ uint64_t SectionVA = Section.getAddress();
+ uint64_t Offset = VA - SectionVA;
+ const ulittle32_t *Data =
+ reinterpret_cast<const ulittle32_t *>(Contents.data() + Offset);
+
+ // Sanity check to ensure that the .xdata header is present.
+ // A header is one or two words, followed by at least one word to describe
+ // the unwind codes. Applicable to both ARM and AArch64.
+ if (Contents.size() - Offset < 8)
+ report_fatal_error(".xdata must be at least 8 bytes in size");
+
+ const ExceptionDataRecord XData(Data, isAArch64);
+ DictScope XRS(SW, "ExceptionData");
+ SW.printNumber("FunctionLength",
+ isAArch64 ? XData.FunctionLengthInBytesAArch64() :
+ XData.FunctionLengthInBytesARM());
+ SW.printNumber("Version", XData.Vers());
+ SW.printBoolean("ExceptionData", XData.X());
+ SW.printBoolean("EpiloguePacked", XData.E());
+ if (!isAArch64)
+ SW.printBoolean("Fragment", XData.F());
+ SW.printNumber(XData.E() ? "EpilogueOffset" : "EpilogueScopes",
+ XData.EpilogueCount());
+ uint64_t ByteCodeLength = XData.CodeWords() * sizeof(uint32_t);
+ SW.printNumber("ByteCodeLength", ByteCodeLength);
+
+ if ((int64_t)(Contents.size() - Offset - 4 * HeaderWords(XData) -
+ (XData.E() ? 0 : XData.EpilogueCount() * 4) -
+ (XData.X() ? 8 : 0)) < (int64_t)ByteCodeLength) {
+ SW.flush();
+ report_fatal_error("Malformed unwind data");
+ }
+
+ if (XData.E()) {
+ ArrayRef<uint8_t> UC = XData.UnwindByteCode();
+ if (isAArch64 || !XData.F()) {
+ ListScope PS(SW, "Prologue");
+ decodeOpcodes(UC, 0, /*Prologue=*/true);
+ }
+ if (XData.EpilogueCount()) {
+ ListScope ES(SW, "Epilogue");
+ decodeOpcodes(UC, XData.EpilogueCount(), /*Prologue=*/false);
+ }
+ } else {
+ {
+ ListScope PS(SW, "Prologue");
+ decodeOpcodes(XData.UnwindByteCode(), 0, /*Prologue=*/true);
+ }
+ ArrayRef<ulittle32_t> EpilogueScopes = XData.EpilogueScopes();
+ ListScope ESS(SW, "EpilogueScopes");
+ for (const EpilogueScope ES : EpilogueScopes) {
+ DictScope ESES(SW, "EpilogueScope");
+ SW.printNumber("StartOffset", ES.EpilogueStartOffset());
+ if (!isAArch64)
+ SW.printNumber("Condition", ES.Condition());
+ SW.printNumber("EpilogueStartIndex",
+ isAArch64 ? ES.EpilogueStartIndexAArch64()
+ : ES.EpilogueStartIndexARM());
+ if (ES.ES & ~0xffc3ffff)
+ SW.printNumber("ReservedBits", (ES.ES >> 18) & 0xF);
+
+ ListScope Opcodes(SW, "Opcodes");
+ decodeOpcodes(XData.UnwindByteCode(),
+ isAArch64 ? ES.EpilogueStartIndexAArch64()
+ : ES.EpilogueStartIndexARM(),
+ /*Prologue=*/false);
+ }
+ }
+
+ if (XData.X()) {
+ const uint32_t Address = XData.ExceptionHandlerRVA();
+ const uint32_t Parameter = XData.ExceptionHandlerParameter();
+ const size_t HandlerOffset = HeaderWords(XData)
+ + (XData.E() ? 0 : XData.EpilogueCount())
+ + XData.CodeWords();
+
+ ErrorOr<SymbolRef> Symbol = getRelocatedSymbol(
+ COFF, Section, Offset + HandlerOffset * sizeof(uint32_t));
+ if (!Symbol)
+ Symbol = getSymbol(COFF, Address, /*FunctionOnly=*/true);
+ if (!Symbol) {
+ ListScope EHS(SW, "ExceptionHandler");
+ SW.printString("Routine", "(null)");
+ return true;
+ }
+
+ Expected<StringRef> Name = Symbol->getName();
+ if (!Name) {
+ std::string Buf;
+ llvm::raw_string_ostream OS(Buf);
+ logAllUnhandledErrors(Name.takeError(), OS);
+ OS.flush();
+ report_fatal_error(Buf);
+ }
+
+ ListScope EHS(SW, "ExceptionHandler");
+ SW.printString("Routine", formatSymbol(*Name, Address));
+ SW.printHex("Parameter", Parameter);
+ }
+
+ return true;
+}
+
+bool Decoder::dumpUnpackedEntry(const COFFObjectFile &COFF,
+ const SectionRef Section, uint64_t Offset,
+ unsigned Index, const RuntimeFunction &RF) {
+ assert(RF.Flag() == RuntimeFunctionFlag::RFF_Unpacked &&
+ "packed entry cannot be treated as an unpacked entry");
+
+ ErrorOr<SymbolRef> Function = getRelocatedSymbol(COFF, Section, Offset);
+ if (!Function)
+ Function = getSymbol(COFF, RF.BeginAddress, /*FunctionOnly=*/true);
+
+ ErrorOr<SymbolRef> XDataRecord = getRelocatedSymbol(COFF, Section, Offset + 4);
+ if (!XDataRecord)
+ XDataRecord = getSymbol(COFF, RF.ExceptionInformationRVA());
+
+ if (!RF.BeginAddress && !Function)
+ return false;
+ if (!RF.UnwindData && !XDataRecord)
+ return false;
+
+ StringRef FunctionName;
+ uint64_t FunctionAddress;
+ if (Function) {
+ Expected<StringRef> FunctionNameOrErr = Function->getName();
+ if (!FunctionNameOrErr) {
+ std::string Buf;
+ llvm::raw_string_ostream OS(Buf);
+ logAllUnhandledErrors(FunctionNameOrErr.takeError(), OS);
+ OS.flush();
+ report_fatal_error(Buf);
+ }
+ FunctionName = *FunctionNameOrErr;
+ Expected<uint64_t> FunctionAddressOrErr = Function->getAddress();
+ if (!FunctionAddressOrErr) {
+ std::string Buf;
+ llvm::raw_string_ostream OS(Buf);
+ logAllUnhandledErrors(FunctionAddressOrErr.takeError(), OS);
+ OS.flush();
+ report_fatal_error(Buf);
+ }
+ FunctionAddress = *FunctionAddressOrErr;
+ } else {
+ FunctionAddress = COFF.getImageBase() + RF.BeginAddress;
+ }
+
+ SW.printString("Function", formatSymbol(FunctionName, FunctionAddress));
+
+ if (XDataRecord) {
+ Expected<StringRef> Name = XDataRecord->getName();
+ if (!Name) {
+ std::string Buf;
+ llvm::raw_string_ostream OS(Buf);
+ logAllUnhandledErrors(Name.takeError(), OS);
+ OS.flush();
+ report_fatal_error(Buf);
+ }
+
+ Expected<uint64_t> AddressOrErr = XDataRecord->getAddress();
+ if (!AddressOrErr) {
+ std::string Buf;
+ llvm::raw_string_ostream OS(Buf);
+ logAllUnhandledErrors(AddressOrErr.takeError(), OS);
+ OS.flush();
+ report_fatal_error(Buf);
+ }
+ uint64_t Address = *AddressOrErr;
+
+ SW.printString("ExceptionRecord", formatSymbol(*Name, Address));
+
+ Expected<section_iterator> SIOrErr = XDataRecord->getSection();
+ if (!SIOrErr) {
+ // TODO: Actually report errors helpfully.
+ consumeError(SIOrErr.takeError());
+ return false;
+ }
+ section_iterator SI = *SIOrErr;
+
+ // FIXME: Do we need to add an offset from the relocation?
+ return dumpXDataRecord(COFF, *SI, FunctionAddress,
+ RF.ExceptionInformationRVA());
+ } else {
+ uint64_t Address = COFF.getImageBase() + RF.ExceptionInformationRVA();
+ SW.printString("ExceptionRecord", formatSymbol("", Address));
+
+ ErrorOr<SectionRef> Section = getSectionContaining(COFF, Address);
+ if (!Section)
+ return false;
+
+ return dumpXDataRecord(COFF, *Section, FunctionAddress, Address);
+ }
+}
+
+bool Decoder::dumpPackedEntry(const object::COFFObjectFile &COFF,
+ const SectionRef Section, uint64_t Offset,
+ unsigned Index, const RuntimeFunction &RF) {
+ assert((RF.Flag() == RuntimeFunctionFlag::RFF_Packed ||
+ RF.Flag() == RuntimeFunctionFlag::RFF_PackedFragment) &&
+ "unpacked entry cannot be treated as a packed entry");
+
+ ErrorOr<SymbolRef> Function = getRelocatedSymbol(COFF, Section, Offset);
+ if (!Function)
+ Function = getSymbol(COFF, RF.BeginAddress, /*FunctionOnly=*/true);
+
+ StringRef FunctionName;
+ uint64_t FunctionAddress;
+ if (Function) {
+ Expected<StringRef> FunctionNameOrErr = Function->getName();
+ if (!FunctionNameOrErr) {
+ std::string Buf;
+ llvm::raw_string_ostream OS(Buf);
+ logAllUnhandledErrors(FunctionNameOrErr.takeError(), OS);
+ OS.flush();
+ report_fatal_error(Buf);
+ }
+ FunctionName = *FunctionNameOrErr;
+ Expected<uint64_t> FunctionAddressOrErr = Function->getAddress();
+ if (!FunctionAddressOrErr) {
+ std::string Buf;
+ llvm::raw_string_ostream OS(Buf);
+ logAllUnhandledErrors(FunctionAddressOrErr.takeError(), OS);
+ OS.flush();
+ report_fatal_error(Buf);
+ }
+ FunctionAddress = *FunctionAddressOrErr;
+ } else {
+ FunctionAddress = COFF.getPE32Header()->ImageBase + RF.BeginAddress;
+ }
+
+ SW.printString("Function", formatSymbol(FunctionName, FunctionAddress));
+ if (!isAArch64)
+ SW.printBoolean("Fragment",
+ RF.Flag() == RuntimeFunctionFlag::RFF_PackedFragment);
+ SW.printNumber("FunctionLength", RF.FunctionLength());
+ SW.startLine() << "ReturnType: " << RF.Ret() << '\n';
+ SW.printBoolean("HomedParameters", RF.H());
+ SW.startLine() << "SavedRegisters: ";
+ printRegisters(SavedRegisterMask(RF));
+ OS << '\n';
+ SW.printNumber("StackAdjustment", StackAdjustment(RF) << 2);
+
+ return true;
+}
+
+bool Decoder::dumpProcedureDataEntry(const COFFObjectFile &COFF,
+ const SectionRef Section, unsigned Index,
+ ArrayRef<uint8_t> Contents) {
+ uint64_t Offset = PDataEntrySize * Index;
+ const ulittle32_t *Data =
+ reinterpret_cast<const ulittle32_t *>(Contents.data() + Offset);
+
+ const RuntimeFunction Entry(Data);
+ DictScope RFS(SW, "RuntimeFunction");
+ if (Entry.Flag() == RuntimeFunctionFlag::RFF_Unpacked)
+ return dumpUnpackedEntry(COFF, Section, Offset, Index, Entry);
+ if (isAArch64) {
+ SW.startLine() << "Packed unwind data not yet supported for ARM64\n";
+ return true;
+ }
+ return dumpPackedEntry(COFF, Section, Offset, Index, Entry);
+}
+
+void Decoder::dumpProcedureData(const COFFObjectFile &COFF,
+ const SectionRef Section) {
+ ArrayRef<uint8_t> Contents;
+ if (COFF.getSectionContents(COFF.getCOFFSection(Section), Contents))
+ return;
+
+ if (Contents.size() % PDataEntrySize) {
+ errs() << ".pdata content is not " << PDataEntrySize << "-byte aligned\n";
+ return;
+ }
+
+ for (unsigned EI = 0, EE = Contents.size() / PDataEntrySize; EI < EE; ++EI)
+ if (!dumpProcedureDataEntry(COFF, Section, EI, Contents))
+ break;
+}
+
+Error Decoder::dumpProcedureData(const COFFObjectFile &COFF) {
+ for (const auto &Section : COFF.sections()) {
+ Expected<StringRef> NameOrErr =
+ COFF.getSectionName(COFF.getCOFFSection(Section));
+ if (!NameOrErr)
+ return NameOrErr.takeError();
+
+ if (NameOrErr->startswith(".pdata"))
+ dumpProcedureData(COFF, Section);
+ }
+ return Error::success();
+}
+}
+}
+}
generated by cgit v1.2.3 (git 2.25.1) at 2025-11-04 02:56:23 +0000