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author Roland Levillain <rpl@google.com> 2016-09-19 14:17:04 +0000
committer Gerrit Code Review <noreply-gerritcodereview@google.com> 2016-09-19 14:17:04 +0000
commit932e7d89addd2620486410a628f6fc33f70f74a4 (patch)
treedf9a86a2783d6318c6a87cde73d9e31711d0733e /disassembler/disassembler_arm.cc
parentf65366918e0cec5ca2c5214128f0a65a3f1bddd6 (diff)
parent29b0cdeb5ef85fcf1ff33ecf09a10803b4b23441 (diff)
Merge "ARM: VIXL32: Implement a disassembler."
Diffstat (limited to 'disassembler/disassembler_arm.cc')
-rw-r--r--disassembler/disassembler_arm.cc2058
1 files changed, 176 insertions, 1882 deletions
diff --git a/disassembler/disassembler_arm.cc b/disassembler/disassembler_arm.cc
index c3e288deae..925047f8b0 100644
--- a/disassembler/disassembler_arm.cc
+++ b/disassembler/disassembler_arm.cc
@@ -16,1938 +16,232 @@
#include "disassembler_arm.h"
-#include <inttypes.h>
-
-#include <ostream>
-#include <sstream>
+#include <memory>
+#include <string>
#include "android-base/logging.h"
-#include "android-base/stringprintf.h"
#include "arch/arm/registers_arm.h"
#include "base/bit_utils.h"
-using android::base::StringPrintf;
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wshadow"
+#include "aarch32/instructions-aarch32.h"
+#include "aarch32/disasm-aarch32.h"
+#pragma GCC diagnostic pop
namespace art {
namespace arm {
-size_t DisassemblerArm::Dump(std::ostream& os, const uint8_t* begin) {
- if ((reinterpret_cast<intptr_t>(begin) & 1) == 0) {
- DumpArm(os, begin);
- return 4;
- } else {
- // remove thumb specifier bits
- begin = reinterpret_cast<const uint8_t*>(reinterpret_cast<uintptr_t>(begin) & ~1);
- return DumpThumb16(os, begin);
- }
-}
-
-void DisassemblerArm::Dump(std::ostream& os, const uint8_t* begin, const uint8_t* end) {
- if ((reinterpret_cast<intptr_t>(begin) & 1) == 0) {
- for (const uint8_t* cur = begin; cur < end; cur += 4) {
- DumpArm(os, cur);
- }
- } else {
- // remove thumb specifier bits
- begin = reinterpret_cast<const uint8_t*>(reinterpret_cast<uintptr_t>(begin) & ~1);
- end = reinterpret_cast<const uint8_t*>(reinterpret_cast<uintptr_t>(end) & ~1);
- for (const uint8_t* cur = begin; cur < end;) {
- cur += DumpThumb16(os, cur);
+using vixl::aarch32::MemOperand;
+using vixl::aarch32::PrintDisassembler;
+using vixl::aarch32::pc;
+
+static const vixl::aarch32::Register tr(TR);
+
+class DisassemblerArm::CustomDisassembler FINAL : public PrintDisassembler {
+ class CustomDisassemblerStream FINAL : public DisassemblerStream {
+ public:
+ CustomDisassemblerStream(std::ostream& os,
+ const CustomDisassembler* disasm,
+ const DisassemblerOptions* options)
+ : DisassemblerStream(os), disasm_(disasm), options_(options) {}
+
+ DisassemblerStream& operator<<(const PrintLabel& label) OVERRIDE {
+ const LocationType type = label.GetLocationType();
+
+ switch (type) {
+ case kLoadByteLocation:
+ case kLoadHalfWordLocation:
+ case kLoadWordLocation:
+ case kLoadDoubleWordLocation:
+ case kLoadSignedByteLocation:
+ case kLoadSignedHalfWordLocation:
+ case kLoadSinglePrecisionLocation:
+ case kLoadDoublePrecisionLocation:
+ case kVld1Location:
+ case kVld2Location:
+ case kVld3Location:
+ case kVld4Location: {
+ const uintptr_t pc_delta = disasm_->IsT32()
+ ? vixl::aarch32::kT32PcDelta
+ : vixl::aarch32::kA32PcDelta;
+ const int32_t offset = label.GetLabel()->GetLocation();
+
+ os() << "[pc, #" << offset - pc_delta << "]";
+ PrintLiteral(type, offset);
+ return *this;
+ }
+ default:
+ return DisassemblerStream::operator<<(label);
+ }
}
- }
-}
-
-static const char* kConditionCodeNames[] = {
- "eq", // 0000 - equal
- "ne", // 0001 - not-equal
- "cs", // 0010 - carry-set, greater than, equal or unordered
- "cc", // 0011 - carry-clear, less than
- "mi", // 0100 - minus, negative
- "pl", // 0101 - plus, positive or zero
- "vs", // 0110 - overflow
- "vc", // 0111 - no overflow
- "hi", // 1000 - unsigned higher
- "ls", // 1001 - unsigned lower or same
- "ge", // 1010 - signed greater than or equal
- "lt", // 1011 - signed less than
- "gt", // 1100 - signed greater than
- "le", // 1101 - signed less than or equal
- "", // 1110 - always
- "nv", // 1111 - never (mostly obsolete, but might be a clue that we're mistranslating)
-};
-void DisassemblerArm::DumpCond(std::ostream& os, uint32_t cond) {
- if (cond < 15) {
- os << kConditionCodeNames[cond];
- } else {
- os << "Unexpected condition: " << cond;
- }
-}
-
-void DisassemblerArm::DumpMemoryDomain(std::ostream& os, uint32_t domain) {
- switch (domain) {
- case 15U /* 0b1111 */: os << "sy"; break;
- case 14U /* 0b1110 */: os << "st"; break;
- case 11U /* 0b1011 */: os << "ish"; break;
- case 10U /* 0b1010 */: os << "ishst"; break;
- case 7U /* 0b0111 */: os << "nsh"; break;
- case 6U /* 0b0110 */: os << "nshst"; break;
- case 3U /* 0b0011 */: os << "osh"; break;
- case 2U /* 0b0010 */: os << "oshst"; break;
- }
-}
+ DisassemblerStream& operator<<(const vixl::aarch32::Register reg) OVERRIDE {
+ if (reg.Is(tr)) {
+ os() << "tr";
+ return *this;
+ } else {
+ return DisassemblerStream::operator<<(reg);
+ }
+ }
-void DisassemblerArm::DumpBranchTarget(std::ostream& os, const uint8_t* instr_ptr, int32_t imm32) {
- os << StringPrintf("%+d (", imm32) << FormatInstructionPointer(instr_ptr + imm32) << ")";
-}
+ DisassemblerStream& operator<<(const MemOperand& operand) OVERRIDE {
+ // VIXL must use a PrintLabel object whenever the base register is PC;
+ // the following check verifies this invariant, and guards against bugs.
+ DCHECK(!operand.GetBaseRegister().Is(pc));
+ DisassemblerStream::operator<<(operand);
-static uint32_t ReadU16(const uint8_t* ptr) {
- return ptr[0] | (ptr[1] << 8);
-}
+ if (operand.GetBaseRegister().Is(tr) && operand.IsImmediate()) {
+ os() << " ; ";
+ options_->thread_offset_name_function_(os(), operand.GetOffsetImmediate());
+ }
-static uint32_t ReadU32(const uint8_t* ptr) {
- return ptr[0] | (ptr[1] << 8) | (ptr[2] << 16) | (ptr[3] << 24);
-}
+ return *this;
+ }
-static const char* kDataProcessingOperations[] = {
- "and", "eor", "sub", "rsb", "add", "adc", "sbc", "rsc",
- "tst", "teq", "cmp", "cmn", "orr", "mov", "bic", "mvn",
-};
+ DisassemblerStream& operator<<(const vixl::aarch32::AlignedMemOperand& operand) OVERRIDE {
+ // VIXL must use a PrintLabel object whenever the base register is PC;
+ // the following check verifies this invariant, and guards against bugs.
+ DCHECK(!operand.GetBaseRegister().Is(pc));
+ return DisassemblerStream::operator<<(operand);
+ }
-static const char* kThumbDataProcessingOperations[] = {
- "and", "eor", "lsl", "lsr", "asr", "adc", "sbc", "ror",
- "tst", "rsb", "cmp", "cmn", "orr", "mul", "bic", "mvn",
-};
+ private:
+ void PrintLiteral(LocationType type, int32_t offset);
-static const char* const kThumb2ShiftOperations[] = {
- "lsl", "lsr", "asr", "ror"
-};
+ const CustomDisassembler* disasm_;
+ const DisassemblerOptions* options_;
+ };
-static const char* kThumbReverseOperations[] = {
- "rev", "rev16", "rbit", "revsh"
-};
+ public:
+ CustomDisassembler(std::ostream& os, const DisassemblerOptions* options)
+ // vixl::aarch32::Disassembler::~Disassembler() will delete the stream.
+ : PrintDisassembler(new CustomDisassemblerStream(os, this, options)) {}
-struct ArmRegister {
- explicit ArmRegister(uint32_t r_in) : r(r_in) { CHECK_LE(r_in, 15U); }
- ArmRegister(uint32_t instruction, uint32_t at_bit) : r((instruction >> at_bit) & 0xf) {
- CHECK_LE(r, 15U);
- }
- uint32_t r;
-};
-std::ostream& operator<<(std::ostream& os, const ArmRegister& r) {
- if (r.r == 13) {
- os << "sp";
- } else if (r.r == 14) {
- os << "lr";
- } else if (r.r == 15) {
- os << "pc";
- } else {
- os << "r" << r.r;
+ void PrintPc(uint32_t prog_ctr) OVERRIDE {
+ os() << "0x" << std::hex << std::setw(8) << std::setfill('0') << prog_ctr << ": ";
}
- return os;
-}
-
-struct ThumbRegister : ArmRegister {
- ThumbRegister(uint16_t instruction, uint16_t at_bit) : ArmRegister((instruction >> at_bit) & 0x7) {}
-};
-struct RmLslImm2 {
- explicit RmLslImm2(uint32_t instr) : imm2((instr >> 4) & 0x3), rm(instr & 0xf) {}
- uint32_t imm2;
- ArmRegister rm;
-};
-std::ostream& operator<<(std::ostream& os, const RmLslImm2& r) {
- os << r.rm;
- if (r.imm2 != 0) {
- os << ", lsl #" << r.imm2;
+ bool IsT32() const {
+ return is_t32_;
}
- return os;
-}
-struct ShiftedImmediate {
- explicit ShiftedImmediate(uint32_t instruction) {
- uint32_t rotate = ((instruction >> 8) & 0xf);
- uint32_t imm = (instruction & 0xff);
- value = (imm >> (2 * rotate)) | (imm << (32 - (2 * rotate)));
+ void SetT32(bool is_t32) {
+ is_t32_ = is_t32;
}
- uint32_t value;
-};
-std::ostream& operator<<(std::ostream& os, const ShiftedImmediate& rhs) {
- os << "#" << rhs.value;
- return os;
-}
-struct RegisterList {
- explicit RegisterList(uint32_t instruction) : register_list(instruction & 0xffff) {}
- uint32_t register_list;
+ private:
+ bool is_t32_;
};
-std::ostream& operator<<(std::ostream& os, const RegisterList& rhs) {
- if (rhs.register_list == 0) {
- os << "<no register list?>";
- return os;
- }
- os << "{";
- bool first = true;
- for (size_t i = 0; i < 16; i++) {
- if ((rhs.register_list & (1 << i)) != 0) {
- if (first) {
- first = false;
- } else {
- os << ", ";
- }
- os << ArmRegister(i);
- }
- }
- os << "}";
- return os;
-}
-struct FpRegister {
- FpRegister(uint32_t instr, uint16_t at_bit, uint16_t extra_at_bit) {
- size = (instr >> 8) & 1;
- uint32_t Vn = (instr >> at_bit) & 0xF;
- uint32_t N = (instr >> extra_at_bit) & 1;
- r = (size != 0 ? ((N << 4) | Vn) : ((Vn << 1) | N));
- }
- FpRegister(uint32_t instr, uint16_t at_bit, uint16_t extra_at_bit, uint32_t forced_size) {
- size = forced_size;
- uint32_t Vn = (instr >> at_bit) & 0xF;
- uint32_t N = (instr >> extra_at_bit) & 1;
- r = (size != 0 ? ((N << 4) | Vn) : ((Vn << 1) | N));
- }
- FpRegister(const FpRegister& other, uint32_t offset)
- : size(other.size), r(other.r + offset) {}
+void DisassemblerArm::CustomDisassembler::CustomDisassemblerStream::PrintLiteral(LocationType type,
+ int32_t offset) {
+ // Literal offsets are not required to be aligned, so we may need unaligned access.
+ typedef const int16_t unaligned_int16_t __attribute__ ((aligned (1)));
+ typedef const uint16_t unaligned_uint16_t __attribute__ ((aligned (1)));
+ typedef const int32_t unaligned_int32_t __attribute__ ((aligned (1)));
+ typedef const int64_t unaligned_int64_t __attribute__ ((aligned (1)));
+ typedef const float unaligned_float __attribute__ ((aligned (1)));
+ typedef const double unaligned_double __attribute__ ((aligned (1)));
- uint32_t size; // 0 = f32, 1 = f64
- uint32_t r;
-};
-std::ostream& operator<<(std::ostream& os, const FpRegister& rhs) {
- return os << ((rhs.size != 0) ? "d" : "s") << rhs.r;
-}
+ // Zeros are used for the LocationType values this function does not care about.
+ const size_t literal_size[kVst4Location + 1] = {
+ 0, 0, 0, 0, sizeof(uint8_t), sizeof(unaligned_uint16_t), sizeof(unaligned_int32_t),
+ sizeof(unaligned_int64_t), sizeof(int8_t), sizeof(unaligned_int16_t),
+ sizeof(unaligned_float), sizeof(unaligned_double)};
+ const uintptr_t begin = reinterpret_cast<uintptr_t>(options_->base_address_);
+ const uintptr_t end = reinterpret_cast<uintptr_t>(options_->end_address_);
+ uintptr_t literal_addr = RoundDown(disasm_->GetPc(), vixl::aarch32::kRegSizeInBytes) + offset;
-struct FpRegisterRange {
- explicit FpRegisterRange(uint32_t instr)
- : first(instr, 12, 22), imm8(instr & 0xFF) {}
- FpRegister first;
- uint32_t imm8;
-};
-std::ostream& operator<<(std::ostream& os, const FpRegisterRange& rhs) {
- os << "{" << rhs.first;
- int count = (rhs.first.size != 0 ? ((rhs.imm8 + 1u) >> 1) : rhs.imm8);
- if (count > 1) {
- os << "-" << FpRegister(rhs.first, count - 1);
- }
- if (rhs.imm8 == 0) {
- os << " (EMPTY)";
- } else if (rhs.first.size != 0 && (rhs.imm8 & 1) != 0) {
- os << rhs.first << " (HALF)";
+ if (!options_->absolute_addresses_) {
+ literal_addr += begin;
}
- os << "}";
- return os;
-}
-void DisassemblerArm::DumpArm(std::ostream& os, const uint8_t* instr_ptr) {
- uint32_t instruction = ReadU32(instr_ptr);
- uint32_t cond = (instruction >> 28) & 0xf;
- uint32_t op1 = (instruction >> 25) & 0x7;
- std::string opcode;
- std::string suffixes;
- std::ostringstream args;
- switch (op1) {
- case 0:
- case 1: // Data processing instructions.
- {
- if ((instruction & 0x0ff000f0) == 0x01200070) { // BKPT
- opcode = "bkpt";
- uint32_t imm12 = (instruction >> 8) & 0xfff;
- uint32_t imm4 = (instruction & 0xf);
- args << '#' << ((imm12 << 4) | imm4);
- break;
- }
- if ((instruction & 0x0fffffd0) == 0x012fff10) { // BX and BLX (register)
- opcode = (((instruction >> 5) & 1) ? "blx" : "bx");
- args << ArmRegister(instruction & 0xf);
- break;
- }
- bool i = (instruction & (1 << 25)) != 0;
- bool s = (instruction & (1 << 20)) != 0;
- uint32_t op = (instruction >> 21) & 0xf;
- opcode = kDataProcessingOperations[op];
- bool implicit_s = ((op & ~3) == 8); // TST, TEQ, CMP, and CMN.
- bool is_mov = op == 13U /* 0b1101 */ || op == 15U /* 0b1111 */;
- if (is_mov) {
- // Show only Rd and Rm.
- if (s) {
- suffixes += 's';
- }
- args << ArmRegister(instruction, 12) << ", ";
- if (i) {
- args << ShiftedImmediate(instruction);
- } else {
- // TODO: Shifted register.
- args << ArmRegister(instruction, 16) << ", " << ArmRegister(instruction, 0);
- }
- } else {
- if (implicit_s) {
- // Rd is unused (and not shown), and we don't show the 's' suffix either.
- } else {
- if (s) {
- suffixes += 's';
- }
- args << ArmRegister(instruction, 12) << ", ";
- }
- if (i) {
- args << ArmRegister(instruction, 16) << ", " << ShiftedImmediate(instruction);
- } else {
- // TODO: Shifted register.
- args << ArmRegister(instruction, 16) << ", " << ArmRegister(instruction, 0);
- }
- }
- }
- break;
- case 2: // Load/store word and unsigned byte.
- {
- bool p = (instruction & (1 << 24)) != 0;
- bool b = (instruction & (1 << 22)) != 0;
- bool w = (instruction & (1 << 21)) != 0;
- bool l = (instruction & (1 << 20)) != 0;
- opcode = StringPrintf("%s%s", (l ? "ldr" : "str"), (b ? "b" : ""));
- args << ArmRegister(instruction, 12) << ", ";
- ArmRegister rn(instruction, 16);
- if (rn.r == 0xf) {
- UNIMPLEMENTED(FATAL) << "literals";
- } else {
- bool wback = !p || w;
- uint32_t offset = (instruction & 0xfff);
- if (p && !wback) {
- args << "[" << rn << ", #" << offset << "]";
- } else if (p && wback) {
- args << "[" << rn << ", #" << offset << "]!";
- } else if (!p && wback) {
- args << "[" << rn << "], #" << offset;
- } else {
- LOG(FATAL) << p << " " << w;
- }
- if (rn.r == 9) {
- args << " ; ";
- GetDisassemblerOptions()->thread_offset_name_function_(args, offset);
- }
- }
- }
- break;
- case 4: // Load/store multiple.
- {
- bool p = (instruction & (1 << 24)) != 0;
- bool u = (instruction & (1 << 23)) != 0;
- bool w = (instruction & (1 << 21)) != 0;
- bool l = (instruction & (1 << 20)) != 0;
- opcode = StringPrintf("%s%c%c", (l ? "ldm" : "stm"), (u ? 'i' : 'd'), (p ? 'b' : 'a'));
- args << ArmRegister(instruction, 16) << (w ? "!" : "") << ", " << RegisterList(instruction);
+ os() << " ; ";
+
+ // Bail out if not within expected buffer range to avoid trying to fetch invalid literals
+ // (we can encounter them when interpreting raw data as instructions).
+ if (literal_addr < begin || literal_addr > end - literal_size[type]) {
+ os() << "(?)";
+ } else {
+ switch (type) {
+ case kLoadByteLocation:
+ os() << *reinterpret_cast<const uint8_t*>(literal_addr);
+ break;
+ case kLoadHalfWordLocation:
+ os() << *reinterpret_cast<unaligned_uint16_t*>(literal_addr);
+ break;
+ case kLoadWordLocation: {
+ const int32_t value = *reinterpret_cast<unaligned_int32_t*>(literal_addr);
+ os() << "0x" << std::hex << std::setw(8) << std::setfill('0') << value;
+ break;
}
- break;
- case 5: // Branch/branch with link.
- {
- bool bl = (instruction & (1 << 24)) != 0;
- opcode = (bl ? "bl" : "b");
- int32_t imm26 = (instruction & 0xffffff) << 2;
- int32_t imm32 = (imm26 << 6) >> 6; // Sign extend.
- DumpBranchTarget(args, instr_ptr + 8, imm32);
+ case kLoadDoubleWordLocation: {
+ const int64_t value = *reinterpret_cast<unaligned_int64_t*>(literal_addr);
+ os() << "0x" << std::hex << std::setw(16) << std::setfill('0') << value;
+ break;
}
- break;
- default:
- opcode = "???";
- break;
- }
- opcode += kConditionCodeNames[cond];
- opcode += suffixes;
- // TODO: a more complete ARM disassembler could generate wider opcodes.
- os << FormatInstructionPointer(instr_ptr)
- << StringPrintf(": %08x\t%-7s ", instruction, opcode.c_str())
- << args.str() << '\n';
-}
-
-int32_t ThumbExpand(int32_t imm12) {
- if ((imm12 & 0xC00) == 0) {
- switch ((imm12 >> 8) & 3) {
- case 0:
- return imm12 & 0xFF;
- case 1:
- return ((imm12 & 0xFF) << 16) | (imm12 & 0xFF);
- case 2:
- return ((imm12 & 0xFF) << 24) | ((imm12 & 0xFF) << 8);
- default: // 3
- return ((imm12 & 0xFF) << 24) | ((imm12 & 0xFF) << 16) | ((imm12 & 0xFF) << 8) |
- (imm12 & 0xFF);
+ case kLoadSignedByteLocation:
+ os() << *reinterpret_cast<const int8_t*>(literal_addr);
+ break;
+ case kLoadSignedHalfWordLocation:
+ os() << *reinterpret_cast<unaligned_int16_t*>(literal_addr);
+ break;
+ case kLoadSinglePrecisionLocation:
+ os() << *reinterpret_cast<unaligned_float*>(literal_addr);
+ break;
+ case kLoadDoublePrecisionLocation:
+ os() << *reinterpret_cast<unaligned_double*>(literal_addr);
+ break;
+ default:
+ UNIMPLEMENTED(FATAL) << "Unexpected literal type: " << type;
}
- } else {
- uint32_t val = 0x80 | (imm12 & 0x7F);
- int32_t rotate = (imm12 >> 7) & 0x1F;
- return (val >> rotate) | (val << (32 - rotate));
}
}
-uint32_t VFPExpand32(uint32_t imm8) {
- CHECK_EQ(imm8 & 0xffu, imm8);
- uint32_t bit_a = (imm8 >> 7) & 1;
- uint32_t bit_b = (imm8 >> 6) & 1;
- uint32_t slice = imm8 & 0x3f;
- return (bit_a << 31) | ((1 << 30) - (bit_b << 25)) | (slice << 19);
-}
+DisassemblerArm::DisassemblerArm(DisassemblerOptions* options)
+ : Disassembler(options), disasm_(std::make_unique<CustomDisassembler>(output_, options)) {}
-static uint64_t VFPExpand64(uint32_t imm8) {
- CHECK_EQ(imm8 & 0xffu, imm8);
- uint64_t bit_a = (imm8 >> 7) & 1;
- uint64_t bit_b = (imm8 >> 6) & 1;
- uint64_t slice = imm8 & 0x3f;
- return (bit_a << 63) | ((UINT64_C(1) << 62) - (bit_b << 54)) | (slice << 48);
-}
+size_t DisassemblerArm::Dump(std::ostream& os, const uint8_t* begin) {
+ uintptr_t next;
+ // Remove the Thumb specifier bit; no effect if begin does not point to T32 code.
+ const uintptr_t instr_ptr = reinterpret_cast<uintptr_t>(begin) & ~1;
-enum T2LitType {
- kT2LitInvalid,
- kT2LitUByte,
- kT2LitSByte,
- kT2LitUHalf,
- kT2LitSHalf,
- kT2LitUWord,
- kT2LitSWord,
- kT2LitHexWord,
- kT2LitULong,
- kT2LitSLong,
- kT2LitHexLong,
-};
-std::ostream& operator<<(std::ostream& os, T2LitType type) {
- return os << static_cast<int>(type);
-}
+ disasm_->SetT32((reinterpret_cast<uintptr_t>(begin) & 1) != 0);
+ disasm_->JumpToPc(GetPc(instr_ptr));
-void DumpThumb2Literal(std::ostream& args,
- const uint8_t* instr_ptr,
- const uintptr_t lo_adr,
- const uintptr_t hi_adr,
- uint32_t U,
- uint32_t imm32,
- T2LitType type) {
- // Literal offsets (imm32) are not required to be aligned so we may need unaligned access.
- typedef const int16_t unaligned_int16_t __attribute__ ((aligned (1)));
- typedef const uint16_t unaligned_uint16_t __attribute__ ((aligned (1)));
- typedef const int32_t unaligned_int32_t __attribute__ ((aligned (1)));
- typedef const uint32_t unaligned_uint32_t __attribute__ ((aligned (1)));
- typedef const int64_t unaligned_int64_t __attribute__ ((aligned (1)));
- typedef const uint64_t unaligned_uint64_t __attribute__ ((aligned (1)));
-
- // Get address of literal. Bail if not within expected buffer range to
- // avoid trying to fetch invalid literals (we can encounter this when
- // interpreting raw data as instructions).
- uintptr_t pc = RoundDown(reinterpret_cast<intptr_t>(instr_ptr) + 4, 4);
- uintptr_t lit_adr = U ? pc + imm32 : pc - imm32;
- if (lit_adr < lo_adr || lit_adr >= hi_adr) {
- args << " ; (?)";
- return;
+ if (disasm_->IsT32()) {
+ const uint16_t* const ip = reinterpret_cast<const uint16_t*>(instr_ptr);
+ next = reinterpret_cast<uintptr_t>(disasm_->DecodeT32At(ip));
+ } else {
+ const uint32_t* const ip = reinterpret_cast<const uint32_t*>(instr_ptr);
+ next = reinterpret_cast<uintptr_t>(disasm_->DecodeA32At(ip));
}
- args << " ; ";
- switch (type) {
- case kT2LitUByte:
- args << *reinterpret_cast<const uint8_t*>(lit_adr);
- break;
- case kT2LitSByte:
- args << *reinterpret_cast<const int8_t*>(lit_adr);
- break;
- case kT2LitUHalf:
- args << *reinterpret_cast<const unaligned_uint16_t*>(lit_adr);
- break;
- case kT2LitSHalf:
- args << *reinterpret_cast<const unaligned_int16_t*>(lit_adr);
- break;
- case kT2LitUWord:
- args << *reinterpret_cast<const unaligned_uint32_t*>(lit_adr);
- break;
- case kT2LitSWord:
- args << *reinterpret_cast<const unaligned_int32_t*>(lit_adr);
- break;
- case kT2LitHexWord:
- args << StringPrintf("0x%08x", *reinterpret_cast<const unaligned_uint32_t*>(lit_adr));
- break;
- case kT2LitULong:
- args << *reinterpret_cast<const unaligned_uint64_t*>(lit_adr);
- break;
- case kT2LitSLong:
- args << *reinterpret_cast<const unaligned_int64_t*>(lit_adr);
- break;
- case kT2LitHexLong:
- args << StringPrintf("0x%" PRIx64, *reinterpret_cast<unaligned_int64_t*>(lit_adr));
- break;
- default:
- LOG(FATAL) << "Invalid type: " << type;
- break;
- }
+ os << output_.str();
+ output_.str(std::string());
+ return next - instr_ptr;
}
-size_t DisassemblerArm::DumpThumb32(std::ostream& os, const uint8_t* instr_ptr) {
- uint32_t instr = (ReadU16(instr_ptr) << 16) | ReadU16(instr_ptr + 2);
- // |111|1 1|1000000|0000|1111110000000000|
- // |5 3|2 1|0987654|3 0|5 0 5 0|
- // |---|---|-------|----|----------------|
- // |332|2 2|2222222|1111|1111110000000000|
- // |1 9|8 7|6543210|9 6|5 0 5 0|
- // |---|---|-------|----|----------------|
- // |111|op1| op2 | | |
- uint32_t op1 = (instr >> 27) & 3;
- if (op1 == 0) {
- return DumpThumb16(os, instr_ptr);
- }
-
- // Set valid address range of backing buffer.
- const uintptr_t lo_adr = reinterpret_cast<intptr_t>(GetDisassemblerOptions()->base_address_);
- const uintptr_t hi_adr = reinterpret_cast<intptr_t>(GetDisassemblerOptions()->end_address_);
-
- uint32_t op2 = (instr >> 20) & 0x7F;
- std::ostringstream opcode;
- std::ostringstream args;
- switch (op1) {
- case 0:
- break;
- case 1:
- if ((op2 & 0x64) == 0) { // 00x x0xx
- // |111|11|10|00|0|00|0000|1111110000000000|
- // |5 3|21|09|87|6|54|3 0|5 0 5 0|
- // |---|--|--|--|-|--|----|----------------|
- // |332|22|22|22|2|22|1111|1111110000000000|
- // |1 9|87|65|43|2|10|9 6|5 0 5 0|
- // |---|--|--|--|-|--|----|----------------|
- // |111|01|00|op|0|WL| Rn | |
- // |111|01| op2 | | |
- // STM - 111 01 00-01-0-W0 nnnn rrrrrrrrrrrrrrrr
- // LDM - 111 01 00-01-0-W1 nnnn rrrrrrrrrrrrrrrr
- // PUSH- 111 01 00-01-0-10 1101 0M0rrrrrrrrrrrrr
- // POP - 111 01 00-01-0-11 1101 PM0rrrrrrrrrrrrr
- uint32_t op = (instr >> 23) & 3;
- uint32_t W = (instr >> 21) & 1;
- uint32_t L = (instr >> 20) & 1;
- ArmRegister Rn(instr, 16);
- if (op == 1 || op == 2) {
- if (op == 1) {
- if (L == 0) {
- opcode << "stm";
- args << Rn << (W == 0 ? "" : "!") << ", ";
- } else {
- if (Rn.r != 13) {
- opcode << "ldm";
- args << Rn << (W == 0 ? "" : "!") << ", ";
- } else {
- opcode << "pop";
- }
- }
- } else {
- if (L == 0) {
- if (Rn.r != 13) {
- opcode << "stmdb";
- args << Rn << (W == 0 ? "" : "!") << ", ";
- } else {
- opcode << "push";
- }
- } else {
- opcode << "ldmdb";
- args << Rn << (W == 0 ? "" : "!") << ", ";
- }
- }
- args << RegisterList(instr);
- }
- } else if ((op2 & 0x64) == 4) { // 00x x1xx
- uint32_t op3 = (instr >> 23) & 3;
- uint32_t op4 = (instr >> 20) & 3;
- // uint32_t op5 = (instr >> 4) & 0xF;
- ArmRegister Rn(instr, 16);
- ArmRegister Rt(instr, 12);
- ArmRegister Rd(instr, 8);
- uint32_t imm8 = instr & 0xFF;
- if ((op3 & 2) == 2) { // 1x
- int W = (instr >> 21) & 1;
- int U = (instr >> 23) & 1;
- int P = (instr >> 24) & 1;
-
- if ((op4 & 1) == 1) {
- opcode << "ldrd";
- } else {
- opcode << "strd";
- }
- args << Rt << "," << Rd << ", [" << Rn;
- const char *sign = U ? "+" : "-";
- if (P == 0 && W == 1) {
- args << "], #" << sign << (imm8 << 2);
- } else {
- args << ", #" << sign << (imm8 << 2) << "]";
- if (W == 1) {
- args << "!";
- }
- }
- } else { // 0x
- switch (op4) {
- case 0:
- if (op3 == 0) { // op3 is 00, op4 is 00
- opcode << "strex";
- args << Rd << ", " << Rt << ", [" << Rn << ", #" << (imm8 << 2) << "]";
- if (Rd.r == 13 || Rd.r == 15 || Rt.r == 13 || Rt.r == 15 || Rn.r == 15 ||
- Rd.r == Rn.r || Rd.r == Rt.r) {
- args << " (UNPREDICTABLE)";
- }
- } else { // op3 is 01, op4 is 00
- // this is one of strexb, strexh or strexd
- int op5 = (instr >> 4) & 0xf;
- switch (op5) {
- case 4:
- case 5:
- opcode << ((op5 == 4) ? "strexb" : "strexh");
- Rd = ArmRegister(instr, 0);
- args << Rd << ", " << Rt << ", [" << Rn << "]";
- if (Rd.r == 13 || Rd.r == 15 || Rt.r == 13 || Rt.r == 15 || Rn.r == 15 ||
- Rd.r == Rn.r || Rd.r == Rt.r || (instr & 0xf00) != 0xf00) {
- args << " (UNPREDICTABLE)";
- }
- break;
- case 7:
- opcode << "strexd";
- ArmRegister Rt2 = Rd;
- Rd = ArmRegister(instr, 0);
- args << Rd << ", " << Rt << ", " << Rt2 << ", [" << Rn << "]";
- if (Rd.r == 13 || Rd.r == 15 || Rt.r == 13 || Rt.r == 15 ||
- Rt2.r == 13 || Rt2.r == 15 || Rn.r == 15 ||
- Rd.r == Rn.r || Rd.r == Rt.r || Rd.r == Rt2.r) {
- args << " (UNPREDICTABLE)";
- }
- break;
- }
- }
- break;
- case 1:
- if (op3 == 0) { // op3 is 00, op4 is 01
- opcode << "ldrex";
- args << Rt << ", [" << Rn << ", #" << (imm8 << 2) << "]";
- if (Rt.r == 13 || Rt.r == 15 || Rn.r == 15 || (instr & 0xf00) != 0xf00) {
- args << " (UNPREDICTABLE)";
- }
- } else { // op3 is 01, op4 is 01
- // this is one of strexb, strexh or strexd
- int op5 = (instr >> 4) & 0xf;
- switch (op5) {
- case 0:
- opcode << "tbb";
- break;
- case 1:
- opcode << "tbh";
- break;
- case 4:
- case 5:
- opcode << ((op5 == 4) ? "ldrexb" : "ldrexh");
- args << Rt << ", [" << Rn << "]";
- if (Rt.r == 13 || Rt.r == 15 || Rn.r == 15 || (instr & 0xf0f) != 0xf0f) {
- args << " (UNPREDICTABLE)";
- }
- break;
- case 7:
- opcode << "ldrexd";
- args << Rt << ", " << Rd /* Rt2 */ << ", [" << Rn << "]";
- if (Rt.r == 13 || Rt.r == 15 || Rd.r == 13 /* Rt2 */ || Rd.r == 15 /* Rt2 */ ||
- Rn.r == 15 || (instr & 0x00f) != 0x00f) {
- args << " (UNPREDICTABLE)";
- }
- break;
- }
- }
- break;
- case 2: // op3 is 0x, op4 is 10
- case 3: // op3 is 0x, op4 is 11
- if (op4 == 2) {
- opcode << "strd";
- } else {
- opcode << "ldrd";
- }
- int W = (instr >> 21) & 1;
- int U = (instr >> 23) & 1;
- int P = (instr >> 24) & 1;
-
- args << Rt << "," << Rd << ", [" << Rn;
- const char *sign = U ? "+" : "-";
- if (P == 0 && W == 1) {
- args << "], #" << sign << imm8;
- } else {
- args << ", #" << sign << imm8 << "]";
- if (W == 1) {
- args << "!";
- }
- }
- break;
- }
- }
-
- } else if ((op2 & 0x60) == 0x20) { // 01x xxxx
- // Data-processing (shifted register)
- // |111|1110|0000|0|0000|1111|1100|00|00|0000|
- // |5 3|2109|8765|4|3 0|5 |10 8|7 |5 |3 0|
- // |---|----|----|-|----|----|----|--|--|----|
- // |332|2222|2222|2|1111|1111|1100|00|00|0000|
- // |1 9|8765|4321|0|9 6|5 |10 8|7 |5 |3 0|
- // |---|----|----|-|----|----|----|--|--|----|
- // |111|0101| op3|S| Rn |imm3| Rd |i2|ty| Rm |
- uint32_t op3 = (instr >> 21) & 0xF;
- uint32_t S = (instr >> 20) & 1;
- uint32_t imm3 = ((instr >> 12) & 0x7);
- uint32_t imm2 = ((instr >> 6) & 0x3);
- uint32_t imm5 = ((imm3 << 2) | imm2);
- uint32_t shift_type = ((instr >> 4) & 0x3);
- ArmRegister Rd(instr, 8);
- ArmRegister Rn(instr, 16);
- ArmRegister Rm(instr, 0);
- switch (op3) {
- case 0x0:
- if (Rd.r != 0xF) {
- opcode << "and";
- } else {
- if (S != 1U) {
- opcode << "UNKNOWN TST-" << S;
- break;
- }
- opcode << "tst";
- S = 0; // don't print 's'
- }
- break;
- case 0x1: opcode << "bic"; break;
- case 0x2:
- if (Rn.r != 0xF) {
- opcode << "orr";
- } else {
- // TODO: use canonical form if there is a shift (lsl, ...).
- opcode << "mov";
- }
- break;
- case 0x3:
- if (Rn.r != 0xF) {
- opcode << "orn";
- } else {
- opcode << "mvn";
- }
- break;
- case 0x4:
- if (Rd.r != 0xF) {
- opcode << "eor";
- } else {
- if (S != 1U) {
- opcode << "UNKNOWN TEQ-" << S;
- break;
- }
- opcode << "teq";
- S = 0; // don't print 's'
- }
- break;
- case 0x6: opcode << "pkh"; break;
- case 0x8:
- if (Rd.r != 0xF) {
- opcode << "add";
- } else {
- if (S != 1U) {
- opcode << "UNKNOWN CMN-" << S;
- break;
- }
- opcode << "cmn";
- S = 0; // don't print 's'
- }
- break;
- case 0xA: opcode << "adc"; break;
- case 0xB: opcode << "sbc"; break;
- case 0xD:
- if (Rd.r != 0xF) {
- opcode << "sub";
- } else {
- if (S != 1U) {
- opcode << "UNKNOWN CMP-" << S;
- break;
- }
- opcode << "cmp";
- S = 0; // don't print 's'
- }
- break;
- case 0xE: opcode << "rsb"; break;
- default: opcode << "UNKNOWN DPSR-" << op3; break;
- }
-
- if (S == 1) {
- opcode << "s";
- }
- opcode << ".w";
-
- if (Rd.r != 0xF) {
- args << Rd << ", ";
- }
- if (Rn.r != 0xF) {
- args << Rn << ", ";
- }
- args << Rm;
-
- // Shift operand.
- bool noShift = (imm5 == 0 && shift_type == 0x0);
- if (!noShift) {
- args << ", ";
- if (shift_type == 0x3u && imm5 == 0u) {
- args << "rrx";
- } else {
- args << kThumb2ShiftOperations[shift_type] << " #" << ((0 != imm5) ? imm5 : 32);
- }
- }
-
- } else if ((op2 & 0x40) == 0x40) { // 1xx xxxx
- // Co-processor instructions
- // |111|1|11|000000|0000|1111|1100|000|0 |0000|
- // |5 3|2|10|987654|3 0|54 2|10 8|7 5|4 | 0|
- // |---|-|--|------|----|----|----|---|---|----|
- // |332|2|22|222222|1111|1111|1100|000|0 |0000|
- // |1 9|8|76|543210|9 6|54 2|10 8|7 5|4 | 0|
- // |---|-|--|------|----|----|----|---|---|----|
- // |111| |11| op3 | Rn | |copr| |op4| |
- uint32_t op3 = (instr >> 20) & 0x3F;
- uint32_t coproc = (instr >> 8) & 0xF;
- uint32_t op4 = (instr >> 4) & 0x1;
-
- if (coproc == 0xA || coproc == 0xB) { // 101x
- if (op3 < 0x20 && (op3 & ~5) != 0) { // 0xxxxx and not 000x0x
- // Extension register load/store instructions
- // |1111|110|00000|0000|1111|110|0|00000000|
- // |5 2|1 9|87654|3 0|5 2|1 9|8|7 0|
- // |----|---|-----|----|----|---|-|--------|
- // |3322|222|22222|1111|1111|110|0|00000000|
- // |1 8|7 5|4 0|9 6|5 2|1 9|8|7 0|
- // |----|---|-----|----|----|---|-|--------|
- // |1110|110|PUDWL| Rn | Vd |101|S| imm8 |
- uint32_t P = (instr >> 24) & 1;
- uint32_t U = (instr >> 23) & 1;
- uint32_t W = (instr >> 21) & 1;
- if (P == U && W == 1) {
- opcode << "UNDEFINED";
- } else {
- uint32_t L = (instr >> 20) & 1;
- uint32_t S = (instr >> 8) & 1;
- ArmRegister Rn(instr, 16);
- if (P == 1 && W == 0) { // VLDR
- FpRegister d(instr, 12, 22);
- uint32_t imm8 = instr & 0xFF;
- opcode << (L == 1 ? "vldr" : "vstr");
- args << d << ", [" << Rn << ", #" << ((U == 1) ? "" : "-")
- << (imm8 << 2) << "]";
- if (Rn.r == 15 && U == 1) {
- DumpThumb2Literal(args, instr_ptr, lo_adr, hi_adr, U, imm8 << 2, kT2LitHexLong);
- }
- } else if (Rn.r == 13 && W == 1 && U == L) { // VPUSH/VPOP
- opcode << (L == 1 ? "vpop" : "vpush");
- args << FpRegisterRange(instr);
- } else { // VLDM
- opcode << (L == 1 ? "vldm" : "vstm");
- args << Rn << ((W == 1) ? "!" : "") << ", "
- << FpRegisterRange(instr);
- }
- opcode << (S == 1 ? ".f64" : ".f32");
- }
- } else if ((op3 >> 1) == 2) { // 00010x
- if ((instr & 0xD0) == 0x10) {
- // 64bit transfers between ARM core and extension registers.
- uint32_t L = (instr >> 20) & 1;
- uint32_t S = (instr >> 8) & 1;
- ArmRegister Rt2(instr, 16);
- ArmRegister Rt(instr, 12);
- FpRegister m(instr, 0, 5);
- opcode << "vmov" << (S ? ".f64" : ".f32");
- if (L == 1) {
- args << Rt << ", " << Rt2 << ", ";
- }
- if (S) {
- args << m;
- } else {
- args << m << ", " << FpRegister(m, 1);
- }
- if (L == 0) {
- args << ", " << Rt << ", " << Rt2;
- }
- if (Rt.r == 15 || Rt.r == 13 || Rt2.r == 15 || Rt2.r == 13 ||
- (S == 0 && m.r == 31) || (L == 1 && Rt.r == Rt2.r)) {
- args << " (UNPREDICTABLE)";
- }
- }
- } else if ((op3 >> 4) == 2 && op4 == 0) { // 10xxxx, op = 0
- // fp data processing
- // VMLA, VMLS, VMUL, VNMUL, VADD, VSUB, VDIV, VMOV, ...
- // |1111|1100|0|0|00|0000|1111|110|0|0|0|0|0|0000|
- // |5 2|1 8|7|6|54|3 0|5 2|1 9|8|7|6|5|4|3 0|
- // |----|----|-|-|--|----|----|---|-|-|-|-|-|----|
- // |3322|2222|2|2|22|1111|1111|110|0|0|0|0|0|0000|
- // |1 8|7 4|3|2|10|9 6|5 2|1 9|8|7|6|5|4|3 0|
- // |----|----|-|-|--|----|----|---|-|-|-|-|-|----|
- // |1110|1110| op3 | Vn | Vd |101|S|N|Q|M|0| Vm |
- // |1110|1110|0|D|00| Vn | Vd |101|S|N|0|M|0| Vm | VMLA
- // |1110|1110|0|D|00| Vn | Vd |101|S|N|1|M|0| Vm | VMLS
- // |1110|1110|0|D|10| Vn | Vd |101|S|N|0|M|0| Vm | VMUL
- // |1110|1110|0|D|10| Vn | Vd |101|S|N|1|M|0| Vm | VNMUL
- // |1110|1110|0|D|11| Vn | Vd |101|S|N|0|M|0| Vm | VADD
- // |1110|1110|0|D|11| Vn | Vd |101|S|N|1|M|0| Vm | VSUB
- // |1110|1110|1|D|00| Vn | Vd |101|S|N|0|M|0| Vm | VDIV
- // |1110|1110|1|D|11| iH | Vd |101|S|0|0|0|0| iL | VMOV (imm)
- // |1110|1110|1|D|11|op5 | Vd |101|S|.|1|M|0| Vm | ... (see below)
- uint32_t S = (instr >> 8) & 1;
- uint32_t Q = (instr >> 6) & 1;
- FpRegister d(instr, 12, 22);
- FpRegister n(instr, 16, 7);
- FpRegister m(instr, 0, 5);
- if ((op3 & 0xB) == 0) { // 100x00
- opcode << (Q == 0 ? "vmla" : "vmls") << (S != 0 ? ".f64" : ".f32");
- args << d << ", " << n << ", " << m;
- } else if ((op3 & 0xB) == 0x2) { // 100x10
- opcode << (Q == 0 ? "vmul" : "vnmul") << (S != 0 ? ".f64" : ".f32");
- args << d << ", " << n << ", " << m;
- } else if ((op3 & 0xB) == 0x3) { // 100x11
- opcode << (Q == 0 ? "vadd" : "vsub") << (S != 0 ? ".f64" : ".f32");
- args << d << ", " << n << ", " << m;
- } else if ((op3 & 0xB) == 0x8 && Q == 0) { // 101x00, Q == 0
- opcode << "vdiv" << (S != 0 ? ".f64" : ".f32");
- args << d << ", " << n << ", " << m;
- } else if ((op3 & 0xB) == 0xB && Q == 0) { // 101x11, Q == 0
- uint32_t imm8 = ((instr & 0xf0000u) >> 12) | (instr & 0xfu);
- opcode << "vmov" << (S != 0 ? ".f64" : ".f32");
- args << d << ", " << (S != 0 ? StringPrintf("0x%016" PRIx64, VFPExpand64(imm8))
- : StringPrintf("0x%08x", VFPExpand32(imm8)));
- if ((instr & 0xa0) != 0) {
- args << " (UNPREDICTABLE)";
- }
- } else if ((op3 & 0xB) == 0xB && Q == 1) { // 101x11, Q == 1
- // VNEG, VSQRT, VCMP, VCMPE, VCVT (floating-point conversion)
- // |1111|1100|0|0|00|0000|1111|110|0|0 |0|0|0|0000|
- // |5 2|1 8|7|6|54|3 0|5 2|1 9|8|7 |6|5|4|3 0|
- // |----|----|-|-|--|----|----|---|-|- |-|-|-|----|
- // |3322|2222|2|2|22|1111|1111|110|0|0 |0|0|0|0000|
- // |1 8|7 4|3|2|10|9 6|5 2|1 9|8|7 |6|5|4|3 0|
- // |----|----|-|-|--|----|----|---|-|- |-|-|-|----|
- // |1110|1110|1|D|11|0000| Vd |101|S|0 |1|M|0| Vm | VMOV (reg)
- // |1110|1110|1|D|11|0000| Vd |101|S|1 |1|M|0| Vm | VABS
- // |1110|1110|1|D|11|0001| Vd |101|S|0 |1|M|0| Vm | VNEG
- // |1110|1110|1|D|11|0001| Vd |101|S|1 |1|M|0| Vm | VSQRT
- // |1110|1110|1|D|11|0100| Vd |101|S|op|1|M|0| Vm | VCMP
- // |1110|1110|1|D|11|0101| Vd |101|S|op|1|0|0|0000| VCMPE
- // |1110|1110|1|D|11|op5 | Vd |101|S|op|1|M|0| Vm | VCVT
- uint32_t op5 = (instr >> 16) & 0xF;
- uint32_t op = (instr >> 7) & 1;
- // Register types in VCVT instructions rely on the combination of op5 and S.
- FpRegister Dd(instr, 12, 22, 1);
- FpRegister Sd(instr, 12, 22, 0);
- FpRegister Dm(instr, 0, 5, 1);
- FpRegister Sm(instr, 0, 5, 0);
- if (op5 == 0) {
- opcode << (op == 0 ? "vmov" : "vabs") << (S != 0 ? ".f64" : ".f32");
- args << d << ", " << m;
- } else if (op5 == 1) {
- opcode << (op != 0 ? "vsqrt" : "vneg") << (S != 0 ? ".f64" : ".f32");
- args << d << ", " << m;
- } else if (op5 == 4) {
- opcode << "vcmp" << ((op != 0) ? "e" : "") << (S != 0 ? ".f64" : ".f32");
- args << d << ", " << m;
- } else if (op5 == 5) {
- opcode << "vcmp" << ((op != 0) ? "e" : "") << (S != 0 ? ".f64" : ".f32");
- args << d << ", #0.0";
- if ((instr & 0x2f) != 0) {
- args << " (UNPREDICTABLE)";
- }
- } else if (op5 == 0xD) {
- if (S == 1) {
- // vcvt{r}.s32.f64
- opcode << "vcvt" << (op == 0 ? "r" : "") << ".s32.f64";
- args << Sd << ", " << Dm;
- } else {
- // vcvt{r}.s32.f32
- opcode << "vcvt" << (op == 0 ? "r" : "") << ".s32.f32";
- args << Sd << ", " << Sm;
- }
- } else if (op5 == 0xC) {
- if (S == 1) {
- // vcvt{r}.u32.f64
- opcode << "vcvt" << (op == 0 ? "r" : "") << ".u32.f64";
- args << Sd << ", " << Dm;
- } else {
- // vcvt{r}.u32.f32
- opcode << "vcvt" << (op == 0 ? "r" : "") << ".u32.f32";
- args << Sd << ", " << Sm;
- }
- } else if (op5 == 0x8) {
- if (S == 1) {
- // vcvt.f64.<Tm>
- opcode << "vcvt.f64." << (op == 0 ? "u" : "s") << "32";
- args << Dd << ", " << Sm;
- } else {
- // vcvt.f32.<Tm>
- opcode << "vcvt.f32." << (op == 0 ? "u" : "s") << "32";
- args << Sd << ", " << Sm;
- }
- } else if (op5 == 0x7) {
- if (op == 1) {
- if (S == 1) {
- // vcvt.f64.f32
- opcode << "vcvt.f64.f32";
- args << Dd << ", " << Sm;
- } else {
- // vcvt.f32.f64
- opcode << "vcvt.f32.f64";
- args << Sd << ", " << Dm;
- }
- }
- } else if ((op5 & 0xa) == 0xa) {
- opcode << "vcvt";
- args << "[undecoded: floating <-> fixed]";
- }
- }
- } else if ((op3 >> 4) == 2 && op4 == 1) { // 10xxxx, op = 1
- if (coproc == 10 && (op3 & 0xE) == 0) {
- // VMOV (between ARM core register and single-precision register)
- // |1111|1100|000|0 |0000|1111|1100|0|00|0|0000|
- // |5 |1 8|7 5|4 |3 0|5 2|1 8|7|65|4|3 0|
- // |----|----|---|- |----|----|----|-|--|-|----|
- // |3322|2222|222|2 |1111|1111|1100|0|00|0|0000|
- // |1 8|7 4|3 1|0 |9 6|5 2|1 8|7|65|4|3 0|
- // |----|----|---|- |----|----|----|-|--|-|----|
- // |1110|1110|000|op| Vn | Rt |1010|N|00|1|0000|
- uint32_t op = op3 & 1;
- ArmRegister Rt(instr, 12);
- FpRegister n(instr, 16, 7);
- opcode << "vmov.f32";
- if (op) {
- args << Rt << ", " << n;
- } else {
- args << n << ", " << Rt;
- }
- if (Rt.r == 13 || Rt.r == 15 || (instr & 0x6F) != 0) {
- args << " (UNPREDICTABLE)";
- }
- } else if (coproc == 10 && op3 == 0x2F) {
- // VMRS
- // |1111|11000000|0000|1111|1100|000|0|0000|
- // |5 |1 4|3 0|5 2|1 8|7 5|4|3 0|
- // |----|--------|----|----|----|---|-|----|
- // |3322|22222222|1111|1111|1100|000|0|0000|
- // |1 8|7 0|9 6|5 2|1 8|7 5|4|3 0|
- // |----|--------|----|----|----|---|-|----|
- // |1110|11101111|reg | Rt |1010|000|1|0000| - last 7 0s are (0)
- uint32_t spec_reg = (instr >> 16) & 0xF;
- ArmRegister Rt(instr, 12);
- opcode << "vmrs";
- if (spec_reg == 1) {
- if (Rt.r == 15) {
- args << "APSR_nzcv, FPSCR";
- } else if (Rt.r == 13) {
- args << Rt << ", FPSCR (UNPREDICTABLE)";
- } else {
- args << Rt << ", FPSCR";
- }
- } else {
- args << "(PRIVILEGED)";
- }
- } else if (coproc == 11 && (op3 & 0x9) != 8) {
- // VMOV (ARM core register to scalar or vice versa; 8/16/32-bit)
- }
- }
- }
- }
- break;
- case 2:
- if ((instr & 0x8000) == 0 && (op2 & 0x20) == 0) {
- // Data-processing (modified immediate)
- // |111|11|10|0000|0|0000|1|111|1100|00000000|
- // |5 3|21|09|8765|4|3 0|5|4 2|10 8|7 5 0|
- // |---|--|--|----|-|----|-|---|----|--------|
- // |332|22|22|2222|2|1111|1|111|1100|00000000|
- // |1 9|87|65|4321|0|9 6|5|4 2|10 8|7 5 0|
- // |---|--|--|----|-|----|-|---|----|--------|
- // |111|10|i0| op3|S| Rn |0|iii| Rd |iiiiiiii|
- // 111 10 x0 xxxx x xxxx opxxx xxxx xxxxxxxx
- uint32_t i = (instr >> 26) & 1;
- uint32_t op3 = (instr >> 21) & 0xF;
- uint32_t S = (instr >> 20) & 1;
- ArmRegister Rn(instr, 16);
- uint32_t imm3 = (instr >> 12) & 7;
- ArmRegister Rd(instr, 8);
- uint32_t imm8 = instr & 0xFF;
- int32_t imm32 = (i << 11) | (imm3 << 8) | imm8;
- if (Rn.r == 0xF && (op3 == 0x2 || op3 == 0x3)) {
- if (op3 == 0x2) {
- opcode << "mov";
- if (S == 1) {
- opcode << "s";
- }
- opcode << ".w";
- } else {
- opcode << "mvn";
- if (S == 1) {
- opcode << "s";
- }
- }
- args << Rd << ", #" << ThumbExpand(imm32);
- } else if (Rd.r == 0xF && S == 1 &&
- (op3 == 0x0 || op3 == 0x4 || op3 == 0x8 || op3 == 0xD)) {
- if (op3 == 0x0) {
- opcode << "tst";
- } else if (op3 == 0x4) {
- opcode << "teq";
- } else if (op3 == 0x8) {
- opcode << "cmn.w";
- } else {
- opcode << "cmp.w";
- }
- args << Rn << ", #" << ThumbExpand(imm32);
- } else {
- switch (op3) {
- case 0x0: opcode << "and"; break;
- case 0x1: opcode << "bic"; break;
- case 0x2: opcode << "orr"; break;
- case 0x3: opcode << "orn"; break;
- case 0x4: opcode << "eor"; break;
- case 0x8: opcode << "add"; break;
- case 0xA: opcode << "adc"; break;
- case 0xB: opcode << "sbc"; break;
- case 0xD: opcode << "sub"; break;
- case 0xE: opcode << "rsb"; break;
- default: opcode << "UNKNOWN DPMI-" << op3; break;
- }
- if (S == 1) {
- opcode << "s";
- }
- args << Rd << ", " << Rn << ", #" << ThumbExpand(imm32);
- }
- } else if ((instr & 0x8000) == 0 && (op2 & 0x20) != 0) {
- // Data-processing (plain binary immediate)
- // |111|11|10|00000|0000|1|111110000000000|
- // |5 3|21|09|87654|3 0|5|4 0 5 0|
- // |---|--|--|-----|----|-|---------------|
- // |332|22|22|22222|1111|1|111110000000000|
- // |1 9|87|65|43210|9 6|5|4 0 5 0|
- // |---|--|--|-----|----|-|---------------|
- // |111|10|x1| op3 | Rn |0|xxxxxxxxxxxxxxx|
- uint32_t op3 = (instr >> 20) & 0x1F;
- switch (op3) {
- case 0x00: case 0x0A: {
- // ADD/SUB.W Rd, Rn #imm12 - 111 10 i1 0101 0 nnnn 0 iii dddd iiiiiiii
- ArmRegister Rd(instr, 8);
- ArmRegister Rn(instr, 16);
- uint32_t i = (instr >> 26) & 1;
- uint32_t imm3 = (instr >> 12) & 0x7;
- uint32_t imm8 = instr & 0xFF;
- uint32_t imm12 = (i << 11) | (imm3 << 8) | imm8;
- if (Rn.r != 0xF) {
- opcode << (op3 == 0 ? "addw" : "subw");
- args << Rd << ", " << Rn << ", #" << imm12;
- } else {
- opcode << "adr";
- args << Rd << ", ";
- DumpBranchTarget(args, instr_ptr + 4, (op3 == 0) ? imm12 : -imm12);
- }
- break;
- }
- case 0x04: case 0x0C: {
- // MOVW/T Rd, #imm16 - 111 10 i0 0010 0 iiii 0 iii dddd iiiiiiii
- ArmRegister Rd(instr, 8);
- uint32_t i = (instr >> 26) & 1;
- uint32_t imm3 = (instr >> 12) & 0x7;
- uint32_t imm8 = instr & 0xFF;
- uint32_t Rn = (instr >> 16) & 0xF;
- uint32_t imm16 = (Rn << 12) | (i << 11) | (imm3 << 8) | imm8;
- opcode << (op3 == 0x04 ? "movw" : "movt");
- args << Rd << ", #" << imm16;
- break;
- }
- case 0x16: case 0x14: case 0x1C: {
- // BFI Rd, Rn, #lsb, #width - 111 10 0 11 011 0 nnnn 0 iii dddd ii 0 iiiii
- // SBFX Rd, Rn, #lsb, #width - 111 10 0 11 010 0 nnnn 0 iii dddd ii 0 iiiii
- // UBFX Rd, Rn, #lsb, #width - 111 10 0 11 110 0 nnnn 0 iii dddd ii 0 iiiii
- ArmRegister Rd(instr, 8);
- ArmRegister Rn(instr, 16);
- uint32_t msb = instr & 0x1F;
- uint32_t imm2 = (instr >> 6) & 0x3;
- uint32_t imm3 = (instr >> 12) & 0x7;
- uint32_t lsb = (imm3 << 2) | imm2;
- uint32_t width = msb - lsb + 1;
- if (op3 == 0x16) {
- if (Rn.r != 0xF) {
- opcode << "bfi";
- args << Rd << ", " << Rn << ", #" << lsb << ", #" << width;
- } else {
- opcode << "bfc";
- args << Rd << ", #" << lsb << ", #" << width;
- }
- } else {
- opcode << ((op3 & 0x8) != 0u ? "ubfx" : "sbfx");
- args << Rd << ", " << Rn << ", #" << lsb << ", #" << width;
- if (Rd.r == 13 || Rd.r == 15 || Rn.r == 13 || Rn.r == 15 ||
- (instr & 0x04000020) != 0u) {
- args << " (UNPREDICTABLE)";
- }
- }
- break;
- }
- default:
- break;
- }
- } else {
- // Branches and miscellaneous control
- // |111|11|1000000|0000|1|111|1100|00000000|
- // |5 3|21|0987654|3 0|5|4 2|10 8|7 5 0|
- // |---|--|-------|----|-|---|----|--------|
- // |332|22|2222222|1111|1|111|1100|00000000|
- // |1 9|87|6543210|9 6|5|4 2|10 8|7 5 0|
- // |---|--|-------|----|-|---|----|--------|
- // |111|10| op2 | |1|op3|op4 | |
-
- uint32_t op3 = (instr >> 12) & 7;
- // uint32_t op4 = (instr >> 8) & 0xF;
- switch (op3) {
- case 0:
- if ((op2 & 0x38) != 0x38) {
- // Conditional branch
- // |111|11|1|0000|000000|1|1|1 |1|1 |10000000000|
- // |5 3|21|0|9876|543 0|5|4|3 |2|1 |0 5 0|
- // |---|--|-|----|------|-|-|--|-|--|-----------|
- // |332|22|2|2222|221111|1|1|1 |1|1 |10000000000|
- // |1 9|87|6|5432|109 6|5|4|3 |2|1 |0 5 0|
- // |---|--|-|----|------|-|-|--|-|--|-----------|
- // |111|10|S|cond| imm6 |1|0|J1|0|J2| imm11 |
- uint32_t S = (instr >> 26) & 1;
- uint32_t J2 = (instr >> 11) & 1;
- uint32_t J1 = (instr >> 13) & 1;
- uint32_t imm6 = (instr >> 16) & 0x3F;
- uint32_t imm11 = instr & 0x7FF;
- uint32_t cond = (instr >> 22) & 0xF;
- int32_t imm32 = (S << 20) | (J2 << 19) | (J1 << 18) | (imm6 << 12) | (imm11 << 1);
- imm32 = (imm32 << 11) >> 11; // sign extend 21bit immediate
- opcode << "b";
- DumpCond(opcode, cond);
- opcode << ".w";
- DumpBranchTarget(args, instr_ptr + 4, imm32);
- } else if (op2 == 0x3B) {
- // Miscellaneous control instructions
- uint32_t op5 = (instr >> 4) & 0xF;
- switch (op5) {
- case 4: opcode << "dsb"; DumpMemoryDomain(args, instr & 0xF); break;
- case 5: opcode << "dmb"; DumpMemoryDomain(args, instr & 0xF); break;
- case 6: opcode << "isb"; DumpMemoryDomain(args, instr & 0xF); break;
- }
- }
- break;
- case 2:
- if ((op2 & 0x38) == 0x38) {
- if (op2 == 0x7F) {
- opcode << "udf";
- }
- break;
- }
- FALLTHROUGH_INTENDED; // Else deliberate fall-through to B.
- case 1: case 3: {
- // B
- // |111|11|1|0000|000000|11|1 |1|1 |10000000000|
- // |5 3|21|0|9876|543 0|54|3 |2|1 |0 5 0|
- // |---|--|-|----|------|--|--|-|--|-----------|
- // |332|22|2|2222|221111|11|1 |1|1 |10000000000|
- // |1 9|87|6|5 2|10 6|54|3 |2|1 |0 5 0|
- // |---|--|-|----|------|--|--|-|--|-----------|
- // |111|10|S|cond| imm6 |10|J1|0|J2| imm11 |
- // |111|10|S| imm10 |10|J1|1|J2| imm11 |
- uint32_t S = (instr >> 26) & 1;
- uint32_t cond = (instr >> 22) & 0xF;
- uint32_t J2 = (instr >> 11) & 1;
- uint32_t form = (instr >> 12) & 1;
- uint32_t J1 = (instr >> 13) & 1;
- uint32_t imm10 = (instr >> 16) & 0x3FF;
- uint32_t imm6 = (instr >> 16) & 0x3F;
- uint32_t imm11 = instr & 0x7FF;
- opcode << "b";
- int32_t imm32;
- if (form == 0) {
- DumpCond(opcode, cond);
- imm32 = (S << 20) | (J2 << 19) | (J1 << 18) | (imm6 << 12) | (imm11 << 1);
- imm32 = (imm32 << 11) >> 11; // sign extend 21 bit immediate.
- } else {
- uint32_t I1 = (J1 ^ S) ^ 1;
- uint32_t I2 = (J2 ^ S) ^ 1;
- imm32 = (S << 24) | (I1 << 23) | (I2 << 22) | (imm10 << 12) | (imm11 << 1);
- imm32 = (imm32 << 7) >> 7; // sign extend 25 bit immediate.
- }
- opcode << ".w";
- DumpBranchTarget(args, instr_ptr + 4, imm32);
- break;
- }
- case 4: case 6: case 5: case 7: {
- // BL, BLX (immediate)
- // |111|11|1|0000000000|11|1 |1|1 |10000000000|
- // |5 3|21|0|9876543 0|54|3 |2|1 |0 5 0|
- // |---|--|-|----------|--|--|-|--|-----------|
- // |332|22|2|2222221111|11|1 |1|1 |10000000000|
- // |1 9|87|6|5 0 6|54|3 |2|1 |0 5 0|
- // |---|--|-|----------|--|--|-|--|-----------|
- // |111|10|S| imm10 |11|J1|L|J2| imm11 |
- uint32_t S = (instr >> 26) & 1;
- uint32_t J2 = (instr >> 11) & 1;
- uint32_t L = (instr >> 12) & 1;
- uint32_t J1 = (instr >> 13) & 1;
- uint32_t imm10 = (instr >> 16) & 0x3FF;
- uint32_t imm11 = instr & 0x7FF;
- if (L == 0) {
- opcode << "bx";
- } else {
- opcode << "blx";
- }
- uint32_t I1 = ~(J1 ^ S);
- uint32_t I2 = ~(J2 ^ S);
- int32_t imm32 = (S << 24) | (I1 << 23) | (I2 << 22) | (imm10 << 12) | (imm11 << 1);
- imm32 = (imm32 << 8) >> 8; // sign extend 24 bit immediate.
- DumpBranchTarget(args, instr_ptr + 4, imm32);
- break;
- }
- }
- }
- break;
- case 3:
- switch (op2) {
- case 0x07: case 0x0F: case 0x17: case 0x1F: { // Explicitly UNDEFINED, A6.3.
- opcode << "UNDEFINED";
- break;
- }
- case 0x06: case 0x0E: { // "Store single data item" undefined opcodes, A6.3.10.
- opcode << "UNDEFINED [store]";
- break;
- }
- case 0x15: case 0x1D: { // "Load word" undefined opcodes, A6.3.7.
- opcode << "UNDEFINED [load]";
- break;
- }
- case 0x10: case 0x12: case 0x14: case 0x16: case 0x18: case 0x1A: case 0x1C: case 0x1E: {
- opcode << "UNKNOWN " << op2 << " [SIMD]";
- break;
- }
- case 0x01: case 0x00: case 0x09: case 0x08: // {LD,ST}RB{,T}
- case 0x03: case 0x02: case 0x0B: case 0x0A: // {LD,ST}RH{,T}
- case 0x05: case 0x04: case 0x0D: case 0x0C: // {LD,ST}R{,T}
- case 0x11: case 0x19: // LDRSB{,T} (no signed store)
- case 0x13: case 0x1B: { // LDRSH{,T} (no signed store)
- // Load:
- // (Store is the same except that l==0 and always s==0 below.)
- // 00s.whl (sign, word, half, load)
- // LDR{S}B imm12: 11111|00s1001| Rn | Rt |imm12 (0x09)
- // LDR{S}B imm8: 11111|00s0001| Rn | Rt |1PUW|imm8 (0x01)
- // LDR{S}BT imm8: 11111|00s0001| Rn | Rt |1110|imm8 (0x01)
- // LDR{S}B lit: 11111|00sU001|1111| Rt |imm12 (0x01/0x09)
- // LDR{S}B reg: 11111|00s0001| Rn | Rt |000000|imm2| Rm (0x01)
- // LDR{S}H imm12: 11111|00s1011| Rn | Rt |imm12 (0x0B)
- // LDR{S}H imm8: 11111|00s0011| Rn | Rt |1PUW|imm8 (0x03)
- // LDR{S}HT imm8: 11111|00s0011| Rn | Rt |1110|imm8 (0x03)
- // LDR{S}H lit: 11111|00sU011|1111| Rt |imm12 (0x03/0x0B)
- // LDR{S}H reg: 11111|00s0011| Rn | Rt |000000|imm2| Rm (0x03)
- // LDR imm12: 11111|0001101| Rn | Rt |imm12 (0x0D)
- // LDR imm8: 11111|0000101| Rn | Rt |1PUW|imm8 (0x05)
- // LDRT imm8: 11111|0000101| Rn | Rt |1110|imm8 (0x05)
- // LDR lit: 11111|000U101|1111| Rt |imm12 (0x05/0x0D)
- // LDR reg: 11111|0000101| Rn | Rt |000000|imm2| Rm (0x05)
- //
- // If Rt == 15, instead of load we have preload:
- // PLD{W} imm12: 11111|00010W1| Rn |1111|imm12 (0x09/0x0B)
- // PLD{W} imm8: 11111|00000W1| Rn |1111|1100|imm8 (0x01/0x03); -imm8
- // PLD lit: 11111|000U001|1111|1111|imm12 (0x01/0x09)
- // PLD{W} reg: 11111|00000W1| Rn |1111|000000|imm2| Rm (0x01/0x03)
- // PLI imm12: 11111|0011001| Rn |1111|imm12 (0x19)
- // PLI imm8: 11111|0010001| Rn |1111|1100|imm8 (0x11); -imm8
- // PLI lit: 11111|001U001|1111|1111|imm12 (0x01/0x09)
- // PLI reg: 11111|0010001| Rn |1111|000000|imm2| Rm (0x01/0x03)
-
- bool is_load = HasBitSet(instr, 20);
- bool is_half = HasBitSet(instr, 21); // W for PLD/PLDW.
- bool is_word = HasBitSet(instr, 22);
- bool is_signed = HasBitSet(instr, 24);
- ArmRegister Rn(instr, 16);
- ArmRegister Rt(instr, 12);
- uint32_t imm12 = instr & 0xFFF;
- uint32_t U = (instr >> 23) & 1; // U for imm12
- uint32_t imm8 = instr & 0xFF;
- uint32_t op4 = (instr >> 8) & 0xF; // 1PUW for imm8
- if (Rt.r == PC && is_load && !is_word) {
- // PLD, PLDW, PLI
- const char* pld_pli = (is_signed ? "pli" : "pld");
- const char* w = (is_half ? "w" : "");
- if (is_signed && !is_half) {
- opcode << "UNDEFINED [PLI+W]";
- } else if (Rn.r == PC || U != 0u) {
- opcode << pld_pli << w;
- args << "[" << Rn << ", #" << (U != 0u ? "" : "-") << imm12 << "]";
- if (Rn.r == PC && is_half) {
- args << " (UNPREDICTABLE)";
- }
- } else if ((instr & 0xFC0) == 0) {
- opcode << pld_pli << w;
- RmLslImm2 Rm(instr);
- args << "[" << Rn << ", " << Rm << "]";
- } else if (op4 == 0xC) {
- opcode << pld_pli << w;
- args << "[" << Rn << ", #-" << imm8 << "]";
- } else {
- opcode << "UNDEFINED [~" << pld_pli << "]";
- }
- break;
- }
- const char* ldr_str = is_load ? "ldr" : "str";
- const char* sign = is_signed ? "s" : "";
- const char* type = is_word ? "" : is_half ? "h" : "b";
- bool unpred = (Rt.r == SP && !is_word) || (Rt.r == PC && !is_load);
- if (Rn.r == PC && !is_load) {
- opcode << "UNDEFINED [STR-lit]";
- unpred = false;
- } else if (Rn.r == PC || U != 0u) {
- // Load/store with imm12 (load literal if Rn.r == PC; there's no store literal).
- opcode << ldr_str << sign << type << ".w";
- args << Rt << ", [" << Rn << ", #" << (U != 0u ? "" : "-") << imm12 << "]";
- if (Rn.r == TR && is_load) {
- args << " ; ";
- GetDisassemblerOptions()->thread_offset_name_function_(args, imm12);
- } else if (Rn.r == PC) {
- T2LitType lit_type[] = {
- kT2LitUByte, kT2LitUHalf, kT2LitHexWord, kT2LitInvalid,
- kT2LitUByte, kT2LitUHalf, kT2LitHexWord, kT2LitInvalid,
- kT2LitSByte, kT2LitSHalf, kT2LitInvalid, kT2LitInvalid,
- kT2LitSByte, kT2LitSHalf, kT2LitInvalid, kT2LitInvalid,
- };
- DCHECK_LT(op2 >> 1, arraysize(lit_type));
- DCHECK_NE(lit_type[op2 >> 1], kT2LitInvalid);
- DumpThumb2Literal(args, instr_ptr, lo_adr, hi_adr, U, imm12, lit_type[op2 >> 1]);
- }
- } else if ((instr & 0xFC0) == 0) {
- opcode << ldr_str << sign << type << ".w";
- RmLslImm2 Rm(instr);
- args << Rt << ", [" << Rn << ", " << Rm << "]";
- unpred = unpred || (Rm.rm.r == SP) || (Rm.rm.r == PC);
- } else if (is_word && Rn.r == SP && imm8 == 4 && op4 == (is_load ? 0xB : 0xD)) {
- opcode << (is_load ? "pop" : "push") << ".w";
- args << Rn;
- unpred = unpred || (Rn.r == SP);
- } else if ((op4 & 5) == 0) {
- opcode << "UNDEFINED [P = W = 0 for " << ldr_str << "]";
- unpred = false;
- } else {
- uint32_t P = (instr >> 10) & 1;
- U = (instr >> 9) & 1;
- uint32_t W = (instr >> 8) & 1;
- bool pre_index = (P != 0 && W == 1);
- bool post_index = (P == 0 && W == 1);
- const char* t = (P != 0 && U != 0 && W == 0) ? "t" : ""; // Unprivileged load/store?
- opcode << ldr_str << sign << type << t << ".w";
- args << Rt << ", [" << Rn << (post_index ? "]" : "") << ", #" << (U != 0 ? "" : "-")
- << imm8 << (post_index ? "" : "]") << (pre_index ? "!" : "");
- unpred = (W != 0 && Rn.r == Rt.r);
- }
- if (unpred) {
- args << " (UNPREDICTABLE)";
- }
- break;
- }
- case 0x29: { // 0101001
- // |111|11|1000000|0000|1111|1100|00|0 0|0000|
- // |5 3|21|0 4|3 0|5 2|1 8|76|5 4|3 0|
- // |---|--|-------|----|----|----|--|---|----|
- // |332|22|2222222|1111|1111|1100|00|0 0|0000|
- // |1 9|87|6 0|9 6|5 2|1 8|76|5 4|3 0|
- // |---|--|-------|----|----|----|--|---|----|
- // |111|11|0101001| Rm |1111| Rd |11|op3| Rm |
- // REV - 111 11 0101001 mmmm 1111 dddd 1000 mmmm
- // REV16 - 111 11 0101001 mmmm 1111 dddd 1001 mmmm
- // RBIT - 111 11 0101001 mmmm 1111 dddd 1010 mmmm
- // REVSH - 111 11 0101001 mmmm 1111 dddd 1011 mmmm
- if ((instr & 0xf0c0) == 0xf080) {
- uint32_t op3 = (instr >> 4) & 3;
- opcode << kThumbReverseOperations[op3];
- ArmRegister Rm(instr, 0);
- ArmRegister Rd(instr, 8);
- args << Rd << ", " << Rm;
- ArmRegister Rm2(instr, 16);
- if (Rm.r != Rm2.r || Rm.r == 13 || Rm.r == 15 || Rd.r == 13 || Rd.r == 15) {
- args << " (UNPREDICTABLE)";
- }
- } // else unknown instruction
- break;
- }
- case 0x2B: { // 0101011
- // CLZ - 111 11 0101011 mmmm 1111 dddd 1000 mmmm
- if ((instr & 0xf0f0) == 0xf080) {
- opcode << "clz";
- ArmRegister Rm(instr, 0);
- ArmRegister Rd(instr, 8);
- args << Rd << ", " << Rm;
- ArmRegister Rm2(instr, 16);
- if (Rm.r != Rm2.r || Rm.r == 13 || Rm.r == 15 || Rd.r == 13 || Rd.r == 15) {
- args << " (UNPREDICTABLE)";
- }
- }
- break;
- }
- case 0x7B: case 0x7F: {
- FpRegister d(instr, 12, 22);
- FpRegister m(instr, 0, 5);
- uint32_t sz = (instr >> 18) & 0x3; // Decode size bits.
- uint32_t size = (sz == 0) ? 8 : sz << 4;
- uint32_t opc2 = (instr >> 7) & 0xF;
- uint32_t Q = (instr >> 6) & 1;
- if (Q == 0 && opc2 == 0xA && size == 8) { // 1010, VCNT
- opcode << "vcnt." << size;
- args << d << ", " << m;
- } else if (Q == 0 && (opc2 == 0x4 || opc2 == 0x5) && size <= 32) { // 010x, VPADDL
- bool op = HasBitSet(instr, 7);
- opcode << "vpaddl." << (op ? "u" : "s") << size;
- args << d << ", " << m;
- } else {
- opcode << "UNKNOWN " << op2;
- }
- break;
- }
- default: // more formats
- if ((op2 >> 4) == 2) { // 010xxxx
- // data processing (register)
- if ((instr & 0x0080f0f0) == 0x0000f000) {
- // LSL, LSR, ASR, ROR
- uint32_t shift_op = (instr >> 21) & 3;
- uint32_t S = (instr >> 20) & 1;
- ArmRegister Rd(instr, 8);
- ArmRegister Rn(instr, 16);
- ArmRegister Rm(instr, 0);
- opcode << kThumb2ShiftOperations[shift_op] << (S != 0 ? "s" : "");
- args << Rd << ", " << Rn << ", " << Rm;
- }
- } else if ((op2 >> 3) == 6) { // 0110xxx
- // Multiply, multiply accumulate, and absolute difference
- op1 = (instr >> 20) & 0x7;
- op2 = (instr >> 4) & 0x1;
- ArmRegister Ra(instr, 12);
- ArmRegister Rn(instr, 16);
- ArmRegister Rm(instr, 0);
- ArmRegister Rd(instr, 8);
- switch (op1) {
- case 0:
- if (op2 == 0) {
- if (Ra.r == 0xf) {
- opcode << "mul";
- args << Rd << ", " << Rn << ", " << Rm;
- } else {
- opcode << "mla";
- args << Rd << ", " << Rn << ", " << Rm << ", " << Ra;
- }
- } else {
- opcode << "mls";
- args << Rd << ", " << Rn << ", " << Rm << ", " << Ra;
- }
- break;
- case 1:
- case 2:
- case 3:
- case 4:
- case 5:
- case 6:
- break; // do these sometime
- }
- } else if ((op2 >> 3) == 7) { // 0111xxx
- // Long multiply, long multiply accumulate, and divide
- op1 = (instr >> 20) & 0x7;
- op2 = (instr >> 4) & 0xf;
- ArmRegister Rn(instr, 16);
- ArmRegister Rm(instr, 0);
- ArmRegister Rd(instr, 8);
- ArmRegister RdHi(instr, 8);
- ArmRegister RdLo(instr, 12);
- switch (op1) {
- case 0:
- opcode << "smull";
- args << RdLo << ", " << RdHi << ", " << Rn << ", " << Rm;
- break;
- case 1:
- opcode << "sdiv";
- args << Rd << ", " << Rn << ", " << Rm;
- break;
- case 2:
- opcode << "umull";
- args << RdLo << ", " << RdHi << ", " << Rn << ", " << Rm;
- break;
- case 3:
- opcode << "udiv";
- args << Rd << ", " << Rn << ", " << Rm;
- break;
- case 4:
- case 5:
- case 6:
- break; // TODO: when we generate these...
- }
- }
- }
- break;
- default:
- break;
- }
+void DisassemblerArm::Dump(std::ostream& os, const uint8_t* begin, const uint8_t* end) {
+ DCHECK_LE(begin, end);
- // Apply any IT-block conditions to the opcode if necessary.
- if (!it_conditions_.empty()) {
- opcode << it_conditions_.back();
- it_conditions_.pop_back();
- }
- if (opcode.str().size() == 0) {
- opcode << "UNKNOWN " << op2;
- }
+ // Remove the Thumb specifier bit; no effect if begin does not point to T32 code.
+ const uintptr_t base = reinterpret_cast<uintptr_t>(begin) & ~1;
- os << FormatInstructionPointer(instr_ptr)
- << StringPrintf(": %08x\t%-7s ", instr, opcode.str().c_str())
- << args.str() << '\n';
- return 4;
-} // NOLINT(readability/fn_size)
+ disasm_->SetT32((reinterpret_cast<uintptr_t>(begin) & 1) != 0);
+ disasm_->JumpToPc(GetPc(base));
-size_t DisassemblerArm::DumpThumb16(std::ostream& os, const uint8_t* instr_ptr) {
- uint16_t instr = ReadU16(instr_ptr);
- bool is_32bit = ((instr & 0xF000) == 0xF000) || ((instr & 0xF800) == 0xE800);
- if (is_32bit) {
- return DumpThumb32(os, instr_ptr);
+ if (disasm_->IsT32()) {
+ // The Thumb specifier bits cancel each other.
+ disasm_->DisassembleT32Buffer(reinterpret_cast<const uint16_t*>(base), end - begin);
} else {
- std::ostringstream opcode;
- std::ostringstream args;
- uint16_t opcode1 = instr >> 10;
- if (opcode1 < 0x10) {
- // shift (immediate), add, subtract, move, and compare
- uint16_t opcode2 = instr >> 9;
- switch (opcode2) {
- case 0x0: case 0x1: case 0x2: case 0x3: case 0x4: case 0x5: case 0x6: case 0x7:
- case 0x8: case 0x9: case 0xA: case 0xB: {
- // Logical shift left - 00 000xx iii mmm ddd
- // Logical shift right - 00 001xx iii mmm ddd
- // Arithmetic shift right - 00 010xx iii mmm ddd
- uint16_t imm5 = (instr >> 6) & 0x1F;
- ThumbRegister rm(instr, 3);
- ThumbRegister Rd(instr, 0);
- if (opcode2 <= 3) {
- opcode << "lsls";
- } else if (opcode2 <= 7) {
- opcode << "lsrs";
- } else {
- opcode << "asrs";
- }
- args << Rd << ", " << rm << ", #" << imm5;
- break;
- }
- case 0xC: case 0xD: case 0xE: case 0xF: {
- // Add register - 00 01100 mmm nnn ddd
- // Sub register - 00 01101 mmm nnn ddd
- // Add 3-bit immediate - 00 01110 iii nnn ddd
- // Sub 3-bit immediate - 00 01111 iii nnn ddd
- uint16_t imm3_or_Rm = (instr >> 6) & 7;
- ThumbRegister Rn(instr, 3);
- ThumbRegister Rd(instr, 0);
- if ((opcode2 & 2) != 0 && imm3_or_Rm == 0) {
- opcode << "mov";
- } else {
- if ((opcode2 & 1) == 0) {
- opcode << "adds";
- } else {
- opcode << "subs";
- }
- }
- args << Rd << ", " << Rn;
- if ((opcode2 & 2) == 0) {
- ArmRegister Rm(imm3_or_Rm);
- args << ", " << Rm;
- } else if (imm3_or_Rm != 0) {
- args << ", #" << imm3_or_Rm;
- }
- break;
- }
- case 0x10: case 0x11: case 0x12: case 0x13:
- case 0x14: case 0x15: case 0x16: case 0x17:
- case 0x18: case 0x19: case 0x1A: case 0x1B:
- case 0x1C: case 0x1D: case 0x1E: case 0x1F: {
- // MOVS Rd, #imm8 - 00100 ddd iiiiiiii
- // CMP Rn, #imm8 - 00101 nnn iiiiiiii
- // ADDS Rn, #imm8 - 00110 nnn iiiiiiii
- // SUBS Rn, #imm8 - 00111 nnn iiiiiiii
- ThumbRegister Rn(instr, 8);
- uint16_t imm8 = instr & 0xFF;
- switch (opcode2 >> 2) {
- case 4: opcode << "movs"; break;
- case 5: opcode << "cmp"; break;
- case 6: opcode << "adds"; break;
- case 7: opcode << "subs"; break;
- }
- args << Rn << ", #" << imm8;
- break;
- }
- default:
- break;
- }
- } else if (opcode1 == 0x10) {
- // Data-processing
- uint16_t opcode2 = (instr >> 6) & 0xF;
- ThumbRegister rm(instr, 3);
- ThumbRegister rdn(instr, 0);
- opcode << kThumbDataProcessingOperations[opcode2];
- args << rdn << ", " << rm;
- } else if (opcode1 == 0x11) {
- // Special data instructions and branch and exchange
- uint16_t opcode2 = (instr >> 6) & 0x0F;
- switch (opcode2) {
- case 0x0: case 0x1: case 0x2: case 0x3: {
- // Add low registers - 010001 0000 xxxxxx
- // Add high registers - 010001 0001/001x xxxxxx
- uint16_t DN = (instr >> 7) & 1;
- ArmRegister rm(instr, 3);
- uint16_t Rdn = instr & 7;
- ArmRegister DN_Rdn((DN << 3) | Rdn);
- opcode << "add";
- args << DN_Rdn << ", " << rm;
- break;
- }
- case 0x8: case 0x9: case 0xA: case 0xB: {
- // Move low registers - 010001 1000 xxxxxx
- // Move high registers - 010001 1001/101x xxxxxx
- uint16_t DN = (instr >> 7) & 1;
- ArmRegister rm(instr, 3);
- uint16_t Rdn = instr & 7;
- ArmRegister DN_Rdn((DN << 3) | Rdn);
- opcode << "mov";
- args << DN_Rdn << ", " << rm;
- break;
- }
- case 0x5: case 0x6: case 0x7: {
- // Compare high registers - 010001 0101/011x xxxxxx
- uint16_t N = (instr >> 7) & 1;
- ArmRegister rm(instr, 3);
- uint16_t Rn = instr & 7;
- ArmRegister N_Rn((N << 3) | Rn);
- opcode << "cmp";
- args << N_Rn << ", " << rm;
- break;
- }
- case 0xC: case 0xD: case 0xE: case 0xF: {
- // Branch and exchange - 010001 110x xxxxxx
- // Branch with link and exchange - 010001 111x xxxxxx
- ArmRegister rm(instr, 3);
- opcode << ((opcode2 & 0x2) == 0 ? "bx" : "blx");
- args << rm;
- break;
- }
- default:
- break;
- }
- } else if (opcode1 == 0x12 || opcode1 == 0x13) { // 01001x
- const uintptr_t lo_adr = reinterpret_cast<intptr_t>(GetDisassemblerOptions()->base_address_);
- const uintptr_t hi_adr = reinterpret_cast<intptr_t>(GetDisassemblerOptions()->end_address_);
- ThumbRegister Rt(instr, 8);
- uint16_t imm8 = instr & 0xFF;
- opcode << "ldr";
- args << Rt << ", [pc, #" << (imm8 << 2) << "]";
- DumpThumb2Literal(args, instr_ptr, lo_adr, hi_adr, /*U*/ 1u, imm8 << 2, kT2LitHexWord);
- } else if ((opcode1 >= 0x14 && opcode1 <= 0x17) || // 0101xx
- (opcode1 >= 0x18 && opcode1 <= 0x1f) || // 011xxx
- (opcode1 >= 0x20 && opcode1 <= 0x27)) { // 100xxx
- // Load/store single data item
- uint16_t opA = (instr >> 12) & 0xF;
- if (opA == 0x5) {
- uint16_t opB = (instr >> 9) & 0x7;
- ThumbRegister Rm(instr, 6);
- ThumbRegister Rn(instr, 3);
- ThumbRegister Rt(instr, 0);
- switch (opB) {
- case 0: opcode << "str"; break;
- case 1: opcode << "strh"; break;
- case 2: opcode << "strb"; break;
- case 3: opcode << "ldrsb"; break;
- case 4: opcode << "ldr"; break;
- case 5: opcode << "ldrh"; break;
- case 6: opcode << "ldrb"; break;
- case 7: opcode << "ldrsh"; break;
- }
- args << Rt << ", [" << Rn << ", " << Rm << "]";
- } else if (opA == 9) {
- uint16_t opB = (instr >> 11) & 1;
- ThumbRegister Rt(instr, 8);
- uint16_t imm8 = instr & 0xFF;
- opcode << (opB == 0 ? "str" : "ldr");
- args << Rt << ", [sp, #" << (imm8 << 2) << "]";
- } else {
- uint16_t imm5 = (instr >> 6) & 0x1F;
- uint16_t opB = (instr >> 11) & 1;
- ThumbRegister Rn(instr, 3);
- ThumbRegister Rt(instr, 0);
- switch (opA) {
- case 6:
- imm5 <<= 2;
- opcode << (opB == 0 ? "str" : "ldr");
- break;
- case 7:
- imm5 <<= 0;
- opcode << (opB == 0 ? "strb" : "ldrb");
- break;
- case 8:
- imm5 <<= 1;
- opcode << (opB == 0 ? "strh" : "ldrh");
- break;
- }
- args << Rt << ", [" << Rn << ", #" << imm5 << "]";
- }
- } else if (opcode1 >= 0x34 && opcode1 <= 0x37) { // 1101xx
- int8_t imm8 = instr & 0xFF;
- uint32_t cond = (instr >> 8) & 0xF;
- opcode << "b";
- DumpCond(opcode, cond);
- DumpBranchTarget(args, instr_ptr + 4, (imm8 << 1));
- } else if ((instr & 0xF800) == 0xA800) {
- // Generate SP-relative address
- ThumbRegister rd(instr, 8);
- int imm8 = instr & 0xFF;
- opcode << "add";
- args << rd << ", sp, #" << (imm8 << 2);
- } else if ((instr & 0xF000) == 0xB000) {
- // Miscellaneous 16-bit instructions
- uint16_t opcode2 = (instr >> 5) & 0x7F;
- switch (opcode2) {
- case 0x00: case 0x01: case 0x02: case 0x03: case 0x04: case 0x05: case 0x06: case 0x07: {
- // Add immediate to SP - 1011 00000 ii iiiii
- // Subtract immediate from SP - 1011 00001 ii iiiii
- int imm7 = instr & 0x7F;
- opcode << ((opcode2 & 4) == 0 ? "add" : "sub");
- args << "sp, sp, #" << (imm7 << 2);
- break;
- }
- case 0x08: case 0x09: case 0x0A: case 0x0B: // 0001xxx
- case 0x0C: case 0x0D: case 0x0E: case 0x0F:
- case 0x18: case 0x19: case 0x1A: case 0x1B: // 0011xxx
- case 0x1C: case 0x1D: case 0x1E: case 0x1F:
- case 0x48: case 0x49: case 0x4A: case 0x4B: // 1001xxx
- case 0x4C: case 0x4D: case 0x4E: case 0x4F:
- case 0x58: case 0x59: case 0x5A: case 0x5B: // 1011xxx
- case 0x5C: case 0x5D: case 0x5E: case 0x5F: {
- // CBNZ, CBZ
- uint16_t op = (instr >> 11) & 1;
- uint16_t i = (instr >> 9) & 1;
- uint16_t imm5 = (instr >> 3) & 0x1F;
- ThumbRegister Rn(instr, 0);
- opcode << (op != 0 ? "cbnz" : "cbz");
- uint32_t imm32 = (i << 6) | (imm5 << 1);
- args << Rn << ", ";
- DumpBranchTarget(args, instr_ptr + 4, imm32);
- break;
- }
- case 0x20: case 0x21: case 0x22: case 0x23: case 0x24: case 0x25: case 0x26: case 0x27:
- case 0x28: case 0x29: case 0x2A: case 0x2B: case 0x2C: case 0x2D: case 0x2E: case 0x2F: {
- opcode << "push";
- args << RegisterList((instr & 0xFF) | ((instr & 0x100) << 6));
- break;
- }
- case 0x60: case 0x61: case 0x62: case 0x63: case 0x64: case 0x65: case 0x66: case 0x67:
- case 0x68: case 0x69: case 0x6A: case 0x6B: case 0x6C: case 0x6D: case 0x6E: case 0x6F: {
- opcode << "pop";
- args << RegisterList((instr & 0xFF) | ((instr & 0x100) << 7));
- break;
- }
- case 0x70: case 0x71: case 0x72: case 0x73: case 0x74: case 0x75: case 0x76: case 0x77: {
- opcode << "bkpt";
- args << "#" << (instr & 0xFF);
- break;
- }
- case 0x50: case 0x51: // 101000x
- case 0x52: case 0x53: // 101001x
- case 0x56: case 0x57: { // 101011x
- uint16_t op = (instr >> 6) & 3;
- opcode << kThumbReverseOperations[op];
- ThumbRegister Rm(instr, 3);
- ThumbRegister Rd(instr, 0);
- args << Rd << ", " << Rm;
- break;
- }
- case 0x78: case 0x79: case 0x7A: case 0x7B: // 1111xxx
- case 0x7C: case 0x7D: case 0x7E: case 0x7F: {
- // If-Then, and hints
- uint16_t opA = (instr >> 4) & 0xF;
- uint16_t opB = instr & 0xF;
- if (opB == 0) {
- switch (opA) {
- case 0: opcode << "nop"; break;
- case 1: opcode << "yield"; break;
- case 2: opcode << "wfe"; break;
- case 3: opcode << "sev"; break;
- default: break;
- }
- } else {
- uint32_t first_cond = opA;
- uint32_t mask = opB;
- opcode << "it";
-
- // Flesh out the base "it" opcode with the specific collection of 't's and 'e's,
- // and store up the actual condition codes we'll want to add to the next few opcodes.
- size_t count = 3 - CTZ(mask);
- it_conditions_.resize(count + 2); // Plus the implicit 't', plus the "" for the IT itself.
- for (size_t i = 0; i < count; ++i) {
- bool positive_cond = ((first_cond & 1) != 0);
- bool positive_mask = ((mask & (1 << (3 - i))) != 0);
- if (positive_mask == positive_cond) {
- opcode << 't';
- it_conditions_[i] = kConditionCodeNames[first_cond];
- } else {
- opcode << 'e';
- it_conditions_[i] = kConditionCodeNames[first_cond ^ 1];
- }
- }
- it_conditions_[count] = kConditionCodeNames[first_cond]; // The implicit 't'.
-
- it_conditions_[count + 1] = ""; // No condition code for the IT itself...
- DumpCond(args, first_cond); // ...because it's considered an argument.
- }
- break;
- }
- default:
- break;
- }
- } else if (((instr & 0xF000) == 0x5000) || ((instr & 0xE000) == 0x6000) ||
- ((instr & 0xE000) == 0x8000)) {
- // Load/store single data item
- uint16_t opA = instr >> 12;
- // uint16_t opB = (instr >> 9) & 7;
- switch (opA) {
- case 0x6: {
- // STR Rt, [Rn, #imm] - 01100 iiiii nnn ttt
- // LDR Rt, [Rn, #imm] - 01101 iiiii nnn ttt
- uint16_t imm5 = (instr >> 6) & 0x1F;
- ThumbRegister Rn(instr, 3);
- ThumbRegister Rt(instr, 0);
- opcode << ((instr & 0x800) == 0 ? "str" : "ldr");
- args << Rt << ", [" << Rn << ", #" << (imm5 << 2) << "]";
- break;
- }
- case 0x9: {
- // STR Rt, [SP, #imm] - 01100 ttt iiiiiiii
- // LDR Rt, [SP, #imm] - 01101 ttt iiiiiiii
- uint16_t imm8 = instr & 0xFF;
- ThumbRegister Rt(instr, 8);
- opcode << ((instr & 0x800) == 0 ? "str" : "ldr");
- args << Rt << ", [sp, #" << (imm8 << 2) << "]";
- break;
- }
- default:
- break;
- }
- } else if (opcode1 == 0x38 || opcode1 == 0x39) {
- uint16_t imm11 = instr & 0x7FFF;
- int32_t imm32 = imm11 << 1;
- imm32 = (imm32 << 20) >> 20; // sign extend 12 bit immediate
- opcode << "b";
- DumpBranchTarget(args, instr_ptr + 4, imm32);
- }
-
- // Apply any IT-block conditions to the opcode if necessary.
- if (!it_conditions_.empty()) {
- opcode << it_conditions_.back();
- it_conditions_.pop_back();
- }
-
- os << FormatInstructionPointer(instr_ptr)
- << StringPrintf(": %04x \t%-7s ", instr, opcode.str().c_str())
- << args.str() << '\n';
+ disasm_->DisassembleA32Buffer(reinterpret_cast<const uint32_t*>(base), end - begin);
}
- return 2;
+
+ os << output_.str();
+ output_.str(std::string());
}
} // namespace arm
generated by cgit v1.2.3-59-g8ed1b (git 2.39.0) at 2025-11-04 02:20:43 +0000