| /* |
| * Copyright (C) 2012 The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| #include "disassembler_mips.h" |
| |
| #include <iostream> |
| |
| #include "base/logging.h" |
| #include "base/stringprintf.h" |
| #include "thread.h" |
| |
| namespace art { |
| namespace mips { |
| |
| struct MipsInstruction { |
| uint32_t mask; |
| uint32_t value; |
| const char* name; |
| const char* args_fmt; |
| |
| bool Matches(uint32_t instruction) const { |
| return (instruction & mask) == value; |
| } |
| }; |
| |
| static const uint32_t kOpcodeShift = 26; |
| |
| static const uint32_t kCop1 = (17 << kOpcodeShift); |
| |
| static const uint32_t kITypeMask = (0x3f << kOpcodeShift); |
| static const uint32_t kJTypeMask = (0x3f << kOpcodeShift); |
| static const uint32_t kRTypeMask = ((0x3f << kOpcodeShift) | (0x3f)); |
| static const uint32_t kSpecial2Mask = (0x3f << kOpcodeShift); |
| static const uint32_t kFpMask = kRTypeMask; |
| |
| static const MipsInstruction gMipsInstructions[] = { |
| // "sll r0, r0, 0" is the canonical "nop", used in delay slots. |
| { 0xffffffff, 0, "nop", "" }, |
| |
| // R-type instructions. |
| { kRTypeMask, 0, "sll", "DTA", }, |
| // 0, 1, movci |
| { kRTypeMask, 2, "srl", "DTA", }, |
| { kRTypeMask, 3, "sra", "DTA", }, |
| { kRTypeMask, 4, "sllv", "DTS", }, |
| { kRTypeMask, 6, "srlv", "DTS", }, |
| { kRTypeMask, 7, "srav", "DTS", }, |
| { kRTypeMask, 8, "jr", "S", }, |
| { kRTypeMask | (0x1f << 11), 9 | (31 << 11), "jalr", "S", }, // rd = 31 is implicit. |
| { kRTypeMask, 9, "jalr", "DS", }, // General case. |
| { kRTypeMask | (0x1f << 6), 10, "movz", "DST", }, |
| { kRTypeMask | (0x1f << 6), 11, "movn", "DST", }, |
| { kRTypeMask, 12, "syscall", "", }, // TODO: code |
| { kRTypeMask, 13, "break", "", }, // TODO: code |
| { kRTypeMask, 15, "sync", "", }, // TODO: type |
| { kRTypeMask, 16, "mfhi", "D", }, |
| { kRTypeMask, 17, "mthi", "S", }, |
| { kRTypeMask, 18, "mflo", "D", }, |
| { kRTypeMask, 19, "mtlo", "S", }, |
| { kRTypeMask, 24, "mult", "ST", }, |
| { kRTypeMask, 25, "multu", "ST", }, |
| { kRTypeMask, 26, "div", "ST", }, |
| { kRTypeMask, 27, "divu", "ST", }, |
| { kRTypeMask, 32, "add", "DST", }, |
| { kRTypeMask, 33, "addu", "DST", }, |
| { kRTypeMask, 34, "sub", "DST", }, |
| { kRTypeMask, 35, "subu", "DST", }, |
| { kRTypeMask, 36, "and", "DST", }, |
| { kRTypeMask, 37, "or", "DST", }, |
| { kRTypeMask, 38, "xor", "DST", }, |
| { kRTypeMask, 39, "nor", "DST", }, |
| { kRTypeMask, 42, "slt", "DST", }, |
| { kRTypeMask, 43, "sltu", "DST", }, |
| // 0, 48, tge |
| // 0, 49, tgeu |
| // 0, 50, tlt |
| // 0, 51, tltu |
| // 0, 52, teq |
| // 0, 54, tne |
| |
| // SPECIAL2 |
| { kSpecial2Mask | 0x7ff, (28 << kOpcodeShift) | 2, "mul", "DST" }, |
| { kSpecial2Mask | 0x7ff, (28 << kOpcodeShift) | 32, "clz", "DS" }, |
| { kSpecial2Mask | 0xffff, (28 << kOpcodeShift) | 0, "madd", "ST" }, |
| { kSpecial2Mask | 0xffff, (28 << kOpcodeShift) | 1, "maddu", "ST" }, |
| { kSpecial2Mask | 0xffff, (28 << kOpcodeShift) | 2, "mul", "DST" }, |
| { kSpecial2Mask | 0xffff, (28 << kOpcodeShift) | 4, "msub", "ST" }, |
| { kSpecial2Mask | 0xffff, (28 << kOpcodeShift) | 5, "msubu", "ST" }, |
| { kSpecial2Mask | 0x3f, (28 << kOpcodeShift) | 0x3f, "sdbbp", "" }, // TODO: code |
| |
| // J-type instructions. |
| { kJTypeMask, 2 << kOpcodeShift, "j", "L" }, |
| { kJTypeMask, 3 << kOpcodeShift, "jal", "L" }, |
| |
| // I-type instructions. |
| { kITypeMask, 4 << kOpcodeShift, "beq", "STB" }, |
| { kITypeMask, 5 << kOpcodeShift, "bne", "STB" }, |
| { kITypeMask | (0x1f << 16), 1 << kOpcodeShift | (1 << 16), "bgez", "SB" }, |
| { kITypeMask | (0x1f << 16), 1 << kOpcodeShift | (0 << 16), "bltz", "SB" }, |
| { kITypeMask | (0x1f << 16), 1 << kOpcodeShift | (2 << 16), "bltzl", "SB" }, |
| { kITypeMask | (0x1f << 16), 1 << kOpcodeShift | (16 << 16), "bltzal", "SB" }, |
| { kITypeMask | (0x1f << 16), 1 << kOpcodeShift | (18 << 16), "bltzall", "SB" }, |
| { kITypeMask | (0x1f << 16), 6 << kOpcodeShift | (0 << 16), "blez", "SB" }, |
| { kITypeMask | (0x1f << 16), 7 << kOpcodeShift | (0 << 16), "bgtz", "SB" }, |
| |
| { 0xffff0000, (4 << kOpcodeShift), "b", "B" }, |
| { 0xffff0000, (1 << kOpcodeShift) | (17 << 16), "bal", "B" }, |
| |
| { kITypeMask, 8 << kOpcodeShift, "addi", "TSi", }, |
| { kITypeMask, 9 << kOpcodeShift, "addiu", "TSi", }, |
| { kITypeMask, 10 << kOpcodeShift, "slti", "TSi", }, |
| { kITypeMask, 11 << kOpcodeShift, "sltiu", "TSi", }, |
| { kITypeMask, 12 << kOpcodeShift, "andi", "TSi", }, |
| { kITypeMask, 13 << kOpcodeShift, "ori", "TSi", }, |
| { kITypeMask, 14 << kOpcodeShift, "ori", "TSi", }, |
| { kITypeMask, 15 << kOpcodeShift, "lui", "TI", }, |
| |
| { kITypeMask, 32u << kOpcodeShift, "lb", "TO", }, |
| { kITypeMask, 33u << kOpcodeShift, "lh", "TO", }, |
| { kITypeMask, 35u << kOpcodeShift, "lw", "TO", }, |
| { kITypeMask, 36u << kOpcodeShift, "lbu", "TO", }, |
| { kITypeMask, 37u << kOpcodeShift, "lhu", "TO", }, |
| { kITypeMask, 40u << kOpcodeShift, "sb", "TO", }, |
| { kITypeMask, 41u << kOpcodeShift, "sh", "TO", }, |
| { kITypeMask, 43u << kOpcodeShift, "sw", "TO", }, |
| { kITypeMask, 49u << kOpcodeShift, "lwc1", "tO", }, |
| { kITypeMask, 57u << kOpcodeShift, "swc1", "tO", }, |
| |
| // Floating point. |
| { kFpMask, kCop1 | 0, "add", "fdst" }, |
| { kFpMask, kCop1 | 1, "sub", "fdst" }, |
| { kFpMask, kCop1 | 2, "mul", "fdst" }, |
| { kFpMask, kCop1 | 3, "div", "fdst" }, |
| { kFpMask | (0x1f << 16), kCop1 | 4, "sqrt", "fdst" }, |
| { kFpMask | (0x1f << 16), kCop1 | 5, "abs", "fds" }, |
| { kFpMask | (0x1f << 16), kCop1 | 6, "mov", "fds" }, |
| { kFpMask | (0x1f << 16), kCop1 | 7, "neg", "fds" }, |
| { kFpMask | (0x1f << 16), kCop1 | 8, "round.l", "fds" }, |
| { kFpMask | (0x1f << 16), kCop1 | 9, "trunc.l", "fds" }, |
| { kFpMask | (0x1f << 16), kCop1 | 10, "ceil.l", "fds" }, |
| { kFpMask | (0x1f << 16), kCop1 | 11, "floor.l", "fds" }, |
| { kFpMask | (0x1f << 16), kCop1 | 12, "round.w", "fds" }, |
| { kFpMask | (0x1f << 16), kCop1 | 13, "trunc.w", "fds" }, |
| { kFpMask | (0x1f << 16), kCop1 | 14, "ceil.w", "fds" }, |
| { kFpMask | (0x1f << 16), kCop1 | 15, "floor.w", "fds" }, |
| { kFpMask | (0x1f << 16), kCop1 | 32, "cvt.s", "fds" }, |
| { kFpMask | (0x1f << 16), kCop1 | 33, "cvt.d", "fds" }, |
| { kFpMask | (0x1f << 16), kCop1 | 36, "cvt.w", "fds" }, |
| { kFpMask | (0x1f << 16), kCop1 | 37, "cvt.l", "fds" }, |
| { kFpMask | (0x1f << 16), kCop1 | 38, "cvt.ps", "fds" }, |
| }; |
| |
| static uint32_t ReadU32(const uint8_t* ptr) { |
| // We only support little-endian MIPS. |
| return ptr[0] | (ptr[1] << 8) | (ptr[2] << 16) | (ptr[3] << 24); |
| } |
| |
| static void DumpMips(std::ostream& os, const uint8_t* instr_ptr) { |
| uint32_t instruction = ReadU32(instr_ptr); |
| |
| uint32_t rs = (instruction >> 21) & 0x1f; // I-type, R-type. |
| uint32_t rt = (instruction >> 16) & 0x1f; // I-type, R-type. |
| uint32_t rd = (instruction >> 11) & 0x1f; // R-type. |
| uint32_t sa = (instruction >> 6) & 0x1f; // R-type. |
| |
| std::string opcode; |
| std::ostringstream args; |
| |
| // TODO: remove this! |
| uint32_t op = (instruction >> 26) & 0x3f; |
| uint32_t function = (instruction & 0x3f); // R-type. |
| opcode = StringPrintf("op=%d fn=%d", op, function); |
| |
| for (size_t i = 0; i < arraysize(gMipsInstructions); ++i) { |
| if (gMipsInstructions[i].Matches(instruction)) { |
| opcode = gMipsInstructions[i].name; |
| for (const char* args_fmt = gMipsInstructions[i].args_fmt; *args_fmt; ++args_fmt) { |
| switch (*args_fmt) { |
| case 'A': // sa (shift amount). |
| args << sa; |
| break; |
| case 'B': // Branch offset. |
| { |
| int32_t offset = static_cast<int16_t>(instruction & 0xffff); |
| offset <<= 2; |
| offset += 4; // Delay slot. |
| args << StringPrintf("%p ; %+d", instr_ptr + offset, offset); |
| } |
| break; |
| case 'D': args << 'r' << rd; break; |
| case 'd': args << 'f' << rd; break; |
| case 'f': // Floating point "fmt". |
| { |
| size_t fmt = (instruction >> 21) & 0x7; // TODO: other fmts? |
| switch (fmt) { |
| case 0: opcode += ".s"; break; |
| case 1: opcode += ".d"; break; |
| case 4: opcode += ".w"; break; |
| case 5: opcode += ".l"; break; |
| case 6: opcode += ".ps"; break; |
| default: opcode += ".?"; break; |
| } |
| continue; // No ", ". |
| } |
| break; |
| case 'I': // Upper 16-bit immediate. |
| args << reinterpret_cast<void*>((instruction & 0xffff) << 16); |
| break; |
| case 'i': // Sign-extended lower 16-bit immediate. |
| args << static_cast<int16_t>(instruction & 0xffff); |
| break; |
| case 'L': // Jump label. |
| { |
| // TODO: is this right? |
| uint32_t instr_index = (instruction & 0x1ffffff); |
| uint32_t target = (instr_index << 2); |
| target |= (reinterpret_cast<uintptr_t>(instr_ptr + 4) & 0xf0000000); |
| args << reinterpret_cast<void*>(target); |
| } |
| break; |
| case 'O': // +x(rs) |
| { |
| int32_t offset = static_cast<int16_t>(instruction & 0xffff); |
| args << StringPrintf("%+d(r%d)", offset, rs); |
| if (rs == 17) { |
| args << " ; "; |
| Thread::DumpThreadOffset<4>(args, offset); |
| } |
| } |
| break; |
| case 'S': args << 'r' << rs; break; |
| case 's': args << 'f' << rs; break; |
| case 'T': args << 'r' << rt; break; |
| case 't': args << 'f' << rt; break; |
| } |
| if (*(args_fmt + 1)) { |
| args << ", "; |
| } |
| } |
| break; |
| } |
| } |
| |
| os << StringPrintf("%p: %08x\t%-7s ", instr_ptr, instruction, opcode.c_str()) << args.str() << '\n'; |
| } |
| |
| size_t DisassemblerMips::Dump(std::ostream& os, const uint8_t* begin) { |
| DumpMips(os, begin); |
| return 4; |
| } |
| |
| void DisassemblerMips::Dump(std::ostream& os, const uint8_t* begin, const uint8_t* end) { |
| for (const uint8_t* cur = begin; cur < end; cur += 4) { |
| DumpMips(os, cur); |
| } |
| } |
| |
| } // namespace mips |
| } // namespace art |
