diff options
Diffstat (limited to 'src')
| -rw-r--r-- | src/core/core.vcxproj | 4 | ||||
| -rw-r--r-- | src/core/core.vcxproj.filters | 22 | ||||
| -rw-r--r-- | src/core/src/arm/disassembler/arm_disasm.cpp | 1003 | ||||
| -rw-r--r-- | src/core/src/arm/disassembler/arm_disasm.h | 146 |
4 files changed, 1175 insertions, 0 deletions
diff --git a/src/core/core.vcxproj b/src/core/core.vcxproj index 22fc96fe2..b413beba9 100644 --- a/src/core/core.vcxproj +++ b/src/core/core.vcxproj @@ -181,8 +181,12 @@ </ProjectReference> </ItemGroup> <ItemGroup> + <ClCompile Include="src\arm\disassembler\arm_disasm.cpp" /> <ClCompile Include="src\core.cpp" /> </ItemGroup> + <ItemGroup> + <ClInclude Include="src\arm\disassembler\arm_disasm.h" /> + </ItemGroup> <Import Project="$(VCTargetsPath)\Microsoft.Cpp.targets" /> <ImportGroup Label="ExtensionTargets"> </ImportGroup> diff --git a/src/core/core.vcxproj.filters b/src/core/core.vcxproj.filters new file mode 100644 index 000000000..3c0ae8786 --- /dev/null +++ b/src/core/core.vcxproj.filters @@ -0,0 +1,22 @@ +<?xml version="1.0" encoding="utf-8"?> +<Project ToolsVersion="4.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003"> + <ItemGroup> + <ClCompile Include="src\core.cpp" /> + <ClCompile Include="src\arm\disassembler\arm_disasm.cpp"> + <Filter>arm\disassembler</Filter> + </ClCompile> + </ItemGroup> + <ItemGroup> + <Filter Include="arm"> + <UniqueIdentifier>{b84ab55c-588b-45f0-a5ba-f9ebb0442f13}</UniqueIdentifier> + </Filter> + <Filter Include="arm\disassembler"> + <UniqueIdentifier>{61100188-a726-4024-ab16-95ee242b446e}</UniqueIdentifier> + </Filter> + </ItemGroup> + <ItemGroup> + <ClInclude Include="src\arm\disassembler\arm_disasm.h"> + <Filter>arm\disassembler</Filter> + </ClInclude> + </ItemGroup> +</Project>
\ No newline at end of file diff --git a/src/core/src/arm/disassembler/arm_disasm.cpp b/src/core/src/arm/disassembler/arm_disasm.cpp new file mode 100644 index 000000000..82571a681 --- /dev/null +++ b/src/core/src/arm/disassembler/arm_disasm.cpp @@ -0,0 +1,1003 @@ +// Copyright 2006 The Android Open Source Project + +#include <stdio.h> +#include <string.h> +#include "arm_disasm.h" + +static const char *cond_names[] = { + "eq", + "ne", + "cs", + "cc", + "mi", + "pl", + "vs", + "vc", + "hi", + "ls", + "ge", + "lt", + "gt", + "le", + "", + "RESERVED" +}; + +const char *opcode_names[] = { + "invalid", + "undefined", + "adc", + "add", + "and", + "b", + "bl", + "bic", + "bkpt", + "blx", + "bx", + "cdp", + "clz", + "cmn", + "cmp", + "eor", + "ldc", + "ldm", + "ldr", + "ldrb", + "ldrbt", + "ldrh", + "ldrsb", + "ldrsh", + "ldrt", + "mcr", + "mla", + "mov", + "mrc", + "mrs", + "msr", + "mul", + "mvn", + "orr", + "pld", + "rsb", + "rsc", + "sbc", + "smlal", + "smull", + "stc", + "stm", + "str", + "strb", + "strbt", + "strh", + "strt", + "sub", + "swi", + "swp", + "swpb", + "teq", + "tst", + "umlal", + "umull", + + "undefined", + "adc", + "add", + "and", + "asr", + "b", + "bic", + "bkpt", + "bl", + "blx", + "bx", + "cmn", + "cmp", + "eor", + "ldmia", + "ldr", + "ldrb", + "ldrh", + "ldrsb", + "ldrsh", + "lsl", + "lsr", + "mov", + "mul", + "mvn", + "neg", + "orr", + "pop", + "push", + "ror", + "sbc", + "stmia", + "str", + "strb", + "strh", + "sub", + "swi", + "tst", + + NULL +}; + +// Indexed by the shift type (bits 6-5) +static const char *shift_names[] = { + "LSL", + "LSR", + "ASR", + "ROR" +}; + +static const char* cond_to_str(int cond) { + return cond_names[cond]; +} + +char *Arm::disasm(uint32_t addr, uint32_t insn, char *result) +{ + static char buf[80]; + char *ptr; + + ptr = result ? result : buf; + Opcode opcode = decode(insn); + switch (opcode) { + case OP_INVALID: + sprintf(ptr, "Invalid"); + return ptr; + case OP_UNDEFINED: + sprintf(ptr, "Undefined"); + return ptr; + case OP_ADC: + case OP_ADD: + case OP_AND: + case OP_BIC: + case OP_CMN: + case OP_CMP: + case OP_EOR: + case OP_MOV: + case OP_MVN: + case OP_ORR: + case OP_RSB: + case OP_RSC: + case OP_SBC: + case OP_SUB: + case OP_TEQ: + case OP_TST: + return disasm_alu(opcode, insn, ptr); + case OP_B: + case OP_BL: + return disasm_branch(addr, opcode, insn, ptr); + case OP_BKPT: + return disasm_bkpt(insn, ptr); + case OP_BLX: + // not supported yet + break; + case OP_BX: + return disasm_bx(insn, ptr); + case OP_CDP: + sprintf(ptr, "cdp"); + return ptr; + case OP_CLZ: + return disasm_clz(insn, ptr); + case OP_LDC: + sprintf(ptr, "ldc"); + return ptr; + case OP_LDM: + case OP_STM: + return disasm_memblock(opcode, insn, ptr); + case OP_LDR: + case OP_LDRB: + case OP_LDRBT: + case OP_LDRT: + case OP_STR: + case OP_STRB: + case OP_STRBT: + case OP_STRT: + return disasm_mem(insn, ptr); + case OP_LDRH: + case OP_LDRSB: + case OP_LDRSH: + case OP_STRH: + return disasm_memhalf(insn, ptr); + case OP_MCR: + case OP_MRC: + return disasm_mcr(opcode, insn, ptr); + case OP_MLA: + return disasm_mla(opcode, insn, ptr); + case OP_MRS: + return disasm_mrs(insn, ptr); + case OP_MSR: + return disasm_msr(insn, ptr); + case OP_MUL: + return disasm_mul(opcode, insn, ptr); + case OP_PLD: + return disasm_pld(insn, ptr); + case OP_STC: + sprintf(ptr, "stc"); + return ptr; + case OP_SWI: + return disasm_swi(insn, ptr); + case OP_SWP: + case OP_SWPB: + return disasm_swp(opcode, insn, ptr); + case OP_UMLAL: + case OP_UMULL: + case OP_SMLAL: + case OP_SMULL: + return disasm_umlal(opcode, insn, ptr); + default: + sprintf(ptr, "Error"); + return ptr; + } + return NULL; +} + +char *Arm::disasm_alu(Opcode opcode, uint32_t insn, char *ptr) +{ + static const uint8_t kNoOperand1 = 1; + static const uint8_t kNoDest = 2; + static const uint8_t kNoSbit = 4; + + char rn_str[20]; + char rd_str[20]; + uint8_t flags = 0; + uint8_t cond = (insn >> 28) & 0xf; + uint8_t is_immed = (insn >> 25) & 0x1; + uint8_t bit_s = (insn >> 20) & 1; + uint8_t rn = (insn >> 16) & 0xf; + uint8_t rd = (insn >> 12) & 0xf; + uint8_t immed = insn & 0xff; + + const char *opname = opcode_names[opcode]; + switch (opcode) { + case OP_CMN: + case OP_CMP: + case OP_TEQ: + case OP_TST: + flags = kNoDest | kNoSbit; + break; + case OP_MOV: + case OP_MVN: + flags = kNoOperand1; + break; + default: + break; + } + + // The "mov" instruction ignores the first operand (rn). + rn_str[0] = 0; + if ((flags & kNoOperand1) == 0) { + sprintf(rn_str, "r%d, ", rn); + } + + // The following instructions do not write the result register (rd): + // tst, teq, cmp, cmn. + rd_str[0] = 0; + if ((flags & kNoDest) == 0) { + sprintf(rd_str, "r%d, ", rd); + } + + const char *sbit_str = ""; + if (bit_s && !(flags & kNoSbit)) + sbit_str = "s"; + + if (is_immed) { + sprintf(ptr, "%s%s%s\t%s%s#%u ; 0x%x", + opname, cond_to_str(cond), sbit_str, rd_str, rn_str, immed, immed); + return ptr; + } + + uint8_t shift_is_reg = (insn >> 4) & 1; + uint8_t rotate = (insn >> 8) & 0xf; + uint8_t rm = insn & 0xf; + uint8_t shift_type = (insn >> 5) & 0x3; + uint8_t rs = (insn >> 8) & 0xf; + uint8_t shift_amount = (insn >> 7) & 0x1f; + uint32_t rotated_val = immed; + uint8_t rotate2 = rotate << 1; + rotated_val = (rotated_val >> rotate2) | (rotated_val << (32 - rotate2)); + + if (!shift_is_reg && shift_type == 0 && shift_amount == 0) { + sprintf(ptr, "%s%s%s\t%s%sr%d", + opname, cond_to_str(cond), sbit_str, rd_str, rn_str, rm); + return ptr; + } + + const char *shift_name = shift_names[shift_type]; + if (shift_is_reg) { + sprintf(ptr, "%s%s%s\t%s%sr%d, %s r%d", + opname, cond_to_str(cond), sbit_str, rd_str, rn_str, rm, + shift_name, rs); + return ptr; + } + if (shift_amount == 0) { + if (shift_type == 3) { + sprintf(ptr, "%s%s%s\t%s%sr%d, RRX", + opname, cond_to_str(cond), sbit_str, rd_str, rn_str, rm); + return ptr; + } + shift_amount = 32; + } + sprintf(ptr, "%s%s%s\t%s%sr%d, %s #%u", + opname, cond_to_str(cond), sbit_str, rd_str, rn_str, rm, + shift_name, shift_amount); + return ptr; +} + +char *Arm::disasm_branch(uint32_t addr, Opcode opcode, uint32_t insn, char *ptr) +{ + uint8_t cond = (insn >> 28) & 0xf; + uint32_t offset = insn & 0xffffff; + // Sign-extend the 24-bit offset + if ((offset >> 23) & 1) + offset |= 0xff000000; + + // Pre-compute the left-shift and the prefetch offset + offset <<= 2; + offset += 8; + addr += offset; + const char *opname = opcode_names[opcode]; + sprintf(ptr, "%s%s\t0x%x", opname, cond_to_str(cond), addr); + return ptr; +} + +char *Arm::disasm_bx(uint32_t insn, char *ptr) +{ + uint8_t cond = (insn >> 28) & 0xf; + uint8_t rn = insn & 0xf; + sprintf(ptr, "bx%s\tr%d", cond_to_str(cond), rn); + return ptr; +} + +char *Arm::disasm_bkpt(uint32_t insn, char *ptr) +{ + uint32_t immed = (((insn >> 8) & 0xfff) << 4) | (insn & 0xf); + sprintf(ptr, "bkpt\t#%d", immed); + return ptr; +} + +char *Arm::disasm_clz(uint32_t insn, char *ptr) +{ + uint8_t cond = (insn >> 28) & 0xf; + uint8_t rd = (insn >> 12) & 0xf; + uint8_t rm = insn & 0xf; + sprintf(ptr, "clz%s\tr%d, r%d", cond_to_str(cond), rd, rm); + return ptr; +} + +char *Arm::disasm_memblock(Opcode opcode, uint32_t insn, char *ptr) +{ + char tmp_reg[10], tmp_list[80]; + + uint8_t cond = (insn >> 28) & 0xf; + uint8_t write_back = (insn >> 21) & 0x1; + uint8_t bit_s = (insn >> 22) & 0x1; + uint8_t is_up = (insn >> 23) & 0x1; + uint8_t is_pre = (insn >> 24) & 0x1; + uint8_t rn = (insn >> 16) & 0xf; + uint16_t reg_list = insn & 0xffff; + + const char *opname = opcode_names[opcode]; + + const char *bang = ""; + if (write_back) + bang = "!"; + + const char *carret = ""; + if (bit_s) + carret = "^"; + + const char *comma = ""; + tmp_list[0] = 0; + for (int ii = 0; ii < 16; ++ii) { + if (reg_list & (1 << ii)) { + sprintf(tmp_reg, "%sr%d", comma, ii); + strcat(tmp_list, tmp_reg); + comma = ","; + } + } + + const char *addr_mode = ""; + if (is_pre) { + if (is_up) { + addr_mode = "ib"; + } else { + addr_mode = "db"; + } + } else { + if (is_up) { + addr_mode = "ia"; + } else { + addr_mode = "da"; + } + } + + sprintf(ptr, "%s%s%s\tr%d%s, {%s}%s", + opname, cond_to_str(cond), addr_mode, rn, bang, tmp_list, carret); + return ptr; +} + +char *Arm::disasm_mem(uint32_t insn, char *ptr) +{ + uint8_t cond = (insn >> 28) & 0xf; + uint8_t is_reg = (insn >> 25) & 0x1; + uint8_t is_load = (insn >> 20) & 0x1; + uint8_t write_back = (insn >> 21) & 0x1; + uint8_t is_byte = (insn >> 22) & 0x1; + uint8_t is_up = (insn >> 23) & 0x1; + uint8_t is_pre = (insn >> 24) & 0x1; + uint8_t rn = (insn >> 16) & 0xf; + uint8_t rd = (insn >> 12) & 0xf; + uint16_t offset = insn & 0xfff; + + const char *opname = "ldr"; + if (!is_load) + opname = "str"; + + const char *bang = ""; + if (write_back) + bang = "!"; + + const char *minus = ""; + if (is_up == 0) + minus = "-"; + + const char *byte = ""; + if (is_byte) + byte = "b"; + + if (is_reg == 0) { + if (is_pre) { + if (offset == 0) { + sprintf(ptr, "%s%s%s\tr%d, [r%d]", + opname, cond_to_str(cond), byte, rd, rn); + } else { + sprintf(ptr, "%s%s%s\tr%d, [r%d, #%s%u]%s", + opname, cond_to_str(cond), byte, rd, rn, minus, offset, bang); + } + } else { + const char *transfer = ""; + if (write_back) + transfer = "t"; + sprintf(ptr, "%s%s%s%s\tr%d, [r%d], #%s%u", + opname, cond_to_str(cond), byte, transfer, rd, rn, minus, offset); + } + return ptr; + } + + uint8_t rm = insn & 0xf; + uint8_t shift_type = (insn >> 5) & 0x3; + uint8_t shift_amount = (insn >> 7) & 0x1f; + + const char *shift_name = shift_names[shift_type]; + + if (is_pre) { + if (shift_amount == 0) { + if (shift_type == 0) { + sprintf(ptr, "%s%s%s\tr%d, [r%d, %sr%d]%s", + opname, cond_to_str(cond), byte, rd, rn, minus, rm, bang); + return ptr; + } + if (shift_type == 3) { + sprintf(ptr, "%s%s%s\tr%d, [r%d, %sr%d, RRX]%s", + opname, cond_to_str(cond), byte, rd, rn, minus, rm, bang); + return ptr; + } + shift_amount = 32; + } + sprintf(ptr, "%s%s%s\tr%d, [r%d, %sr%d, %s #%u]%s", + opname, cond_to_str(cond), byte, rd, rn, minus, rm, + shift_name, shift_amount, bang); + return ptr; + } + + const char *transfer = ""; + if (write_back) + transfer = "t"; + + if (shift_amount == 0) { + if (shift_type == 0) { + sprintf(ptr, "%s%s%s%s\tr%d, [r%d], %sr%d", + opname, cond_to_str(cond), byte, transfer, rd, rn, minus, rm); + return ptr; + } + if (shift_type == 3) { + sprintf(ptr, "%s%s%s%s\tr%d, [r%d], %sr%d, RRX", + opname, cond_to_str(cond), byte, transfer, rd, rn, minus, rm); + return ptr; + } + shift_amount = 32; + } + + sprintf(ptr, "%s%s%s%s\tr%d, [r%d], %sr%d, %s #%u", + opname, cond_to_str(cond), byte, transfer, rd, rn, minus, rm, + shift_name, shift_amount); + return ptr; +} + +char *Arm::disasm_memhalf(uint32_t insn, char *ptr) +{ + uint8_t cond = (insn >> 28) & 0xf; + uint8_t is_load = (insn >> 20) & 0x1; + uint8_t write_back = (insn >> 21) & 0x1; + uint8_t is_immed = (insn >> 22) & 0x1; + uint8_t is_up = (insn >> 23) & 0x1; + uint8_t is_pre = (insn >> 24) & 0x1; + uint8_t rn = (insn >> 16) & 0xf; + uint8_t rd = (insn >> 12) & 0xf; + uint8_t bits_65 = (insn >> 5) & 0x3; + uint8_t rm = insn & 0xf; + uint8_t offset = (((insn >> 8) & 0xf) << 4) | (insn & 0xf); + + const char *opname = "ldr"; + if (is_load == 0) + opname = "str"; + + const char *width = ""; + if (bits_65 == 1) + width = "h"; + else if (bits_65 == 2) + width = "sb"; + else + width = "sh"; + + const char *bang = ""; + if (write_back) + bang = "!"; + const char *minus = ""; + if (is_up == 0) + minus = "-"; + + if (is_immed) { + if (is_pre) { + if (offset == 0) { + sprintf(ptr, "%s%sh\tr%d, [r%d]", opname, cond_to_str(cond), rd, rn); + } else { + sprintf(ptr, "%s%sh\tr%d, [r%d, #%s%u]%s", + opname, cond_to_str(cond), rd, rn, minus, offset, bang); + } + } else { + sprintf(ptr, "%s%sh\tr%d, [r%d], #%s%u", + opname, cond_to_str(cond), rd, rn, minus, offset); + } + return ptr; + } + + if (is_pre) { + sprintf(ptr, "%s%sh\tr%d, [r%d, %sr%d]%s", + opname, cond_to_str(cond), rd, rn, minus, rm, bang); + } else { + sprintf(ptr, "%s%sh\tr%d, [r%d], %sr%d", + opname, cond_to_str(cond), rd, rn, minus, rm); + } + return ptr; +} + +char *Arm::disasm_mcr(Opcode opcode, uint32_t insn, char *ptr) +{ + uint8_t cond = (insn >> 28) & 0xf; + uint8_t crn = (insn >> 16) & 0xf; + uint8_t crd = (insn >> 12) & 0xf; + uint8_t cpnum = (insn >> 8) & 0xf; + uint8_t opcode2 = (insn >> 5) & 0x7; + uint8_t crm = insn & 0xf; + + const char *opname = opcode_names[opcode]; + sprintf(ptr, "%s%s\t%d, 0, r%d, cr%d, cr%d, {%d}", + opname, cond_to_str(cond), cpnum, crd, crn, crm, opcode2); + return ptr; +} + +char *Arm::disasm_mla(Opcode opcode, uint32_t insn, char *ptr) +{ + uint8_t cond = (insn >> 28) & 0xf; + uint8_t rd = (insn >> 16) & 0xf; + uint8_t rn = (insn >> 12) & 0xf; + uint8_t rs = (insn >> 8) & 0xf; + uint8_t rm = insn & 0xf; + uint8_t bit_s = (insn >> 20) & 1; + + const char *opname = opcode_names[opcode]; + sprintf(ptr, "%s%s%s\tr%d, r%d, r%d, r%d", + opname, cond_to_str(cond), bit_s ? "s" : "", rd, rm, rs, rn); + return ptr; +} + +char *Arm::disasm_umlal(Opcode opcode, uint32_t insn, char *ptr) +{ + uint8_t cond = (insn >> 28) & 0xf; + uint8_t rdhi = (insn >> 16) & 0xf; + uint8_t rdlo = (insn >> 12) & 0xf; + uint8_t rs = (insn >> 8) & 0xf; + uint8_t rm = insn & 0xf; + uint8_t bit_s = (insn >> 20) & 1; + + const char *opname = opcode_names[opcode]; + sprintf(ptr, "%s%s%s\tr%d, r%d, r%d, r%d", + opname, cond_to_str(cond), bit_s ? "s" : "", rdlo, rdhi, rm, rs); + return ptr; +} + +char *Arm::disasm_mul(Opcode opcode, uint32_t insn, char *ptr) +{ + uint8_t cond = (insn >> 28) & 0xf; + uint8_t rd = (insn >> 16) & 0xf; + uint8_t rs = (insn >> 8) & 0xf; + uint8_t rm = insn & 0xf; + uint8_t bit_s = (insn >> 20) & 1; + + const char *opname = opcode_names[opcode]; + sprintf(ptr, "%s%s%s\tr%d, r%d, r%d", + opname, cond_to_str(cond), bit_s ? "s" : "", rd, rm, rs); + return ptr; +} + +char *Arm::disasm_mrs(uint32_t insn, char *ptr) +{ + uint8_t cond = (insn >> 28) & 0xf; + uint8_t rd = (insn >> 12) & 0xf; + uint8_t ps = (insn >> 22) & 1; + + sprintf(ptr, "mrs%s\tr%d, %s", cond_to_str(cond), rd, ps ? "spsr" : "cpsr"); + return ptr; +} + +char *Arm::disasm_msr(uint32_t insn, char *ptr) +{ + char flags[8]; + int flag_index = 0; + uint8_t cond = (insn >> 28) & 0xf; + uint8_t is_immed = (insn >> 25) & 0x1; + uint8_t pd = (insn >> 22) & 1; + uint8_t mask = (insn >> 16) & 0xf; + + if (mask & 1) + flags[flag_index++] = 'c'; + if (mask & 2) + flags[flag_index++] = 'x'; + if (mask & 4) + flags[flag_index++] = 's'; + if (mask & 8) + flags[flag_index++] = 'f'; + flags[flag_index] = 0; + + if (is_immed) { + uint32_t immed = insn & 0xff; + uint8_t rotate = (insn >> 8) & 0xf; + uint8_t rotate2 = rotate << 1; + uint32_t rotated_val = (immed >> rotate2) | (immed << (32 - rotate2)); + sprintf(ptr, "msr%s\t%s_%s, #0x%x", + cond_to_str(cond), pd ? "spsr" : "cpsr", flags, rotated_val); + return ptr; + } + + uint8_t rm = insn & 0xf; + + sprintf(ptr, "msr%s\t%s_%s, r%d", + cond_to_str(cond), pd ? "spsr" : "cpsr", flags, rm); + return ptr; +} + +char *Arm::disasm_pld(uint32_t insn, char *ptr) +{ + uint8_t is_reg = (insn >> 25) & 0x1; + uint8_t is_up = (insn >> 23) & 0x1; + uint8_t rn = (insn >> 16) & 0xf; + + const char *minus = ""; + if (is_up == 0) + minus = "-"; + + if (is_reg) { + uint8_t rm = insn & 0xf; + sprintf(ptr, "pld\t[r%d, %sr%d]", rn, minus, rm); + return ptr; + } + + uint16_t offset = insn & 0xfff; + if (offset == 0) { + sprintf(ptr, "pld\t[r%d]", rn); + } else { + sprintf(ptr, "pld\t[r%d, #%s%u]", rn, minus, offset); + } + return ptr; +} + +char *Arm::disasm_swi(uint32_t insn, char *ptr) +{ + uint8_t cond = (insn >> 28) & 0xf; + uint32_t sysnum = insn & 0x00ffffff; + + sprintf(ptr, "swi%s 0x%x", cond_to_str(cond), sysnum); + return ptr; +} + +char *Arm::disasm_swp(Opcode opcode, uint32_t insn, char *ptr) +{ + uint8_t cond = (insn >> 28) & 0xf; + uint8_t rn = (insn >> 16) & 0xf; + uint8_t rd = (insn >> 12) & 0xf; + uint8_t rm = insn & 0xf; + + const char *opname = opcode_names[opcode]; + sprintf(ptr, "%s%s\tr%d, r%d, [r%d]", opname, cond_to_str(cond), rd, rm, rn); + return ptr; +} + +Opcode Arm::decode(uint32_t insn) { + uint32_t bits27_26 = (insn >> 26) & 0x3; + switch (bits27_26) { + case 0x0: + return decode00(insn); + case 0x1: + return decode01(insn); + case 0x2: + return decode10(insn); + case 0x3: + return decode11(insn); + } + return OP_INVALID; +} + +Opcode Arm::decode00(uint32_t insn) { + uint8_t bit25 = (insn >> 25) & 0x1; + uint8_t bit4 = (insn >> 4) & 0x1; + if (bit25 == 0 && bit4 == 1) { + if ((insn & 0x0ffffff0) == 0x012fff10) { + // Bx instruction + return OP_BX; + } + if ((insn & 0x0ff000f0) == 0x01600010) { + // Clz instruction + return OP_CLZ; + } + if ((insn & 0xfff000f0) == 0xe1200070) { + // Bkpt instruction + return OP_BKPT; + } + uint32_t bits7_4 = (insn >> 4) & 0xf; + if (bits7_4 == 0x9) { + if ((insn & 0x0ff00ff0) == 0x01000090) { + // Swp instruction + uint8_t bit22 = (insn >> 22) & 0x1; + if (bit22) + return OP_SWPB; + return OP_SWP; + } + // One of the multiply instructions + return decode_mul(insn); + } + + uint8_t bit7 = (insn >> 7) & 0x1; + if (bit7 == 1) { + // One of the load/store halfword/byte instructions + return decode_ldrh(insn); + } + } + + // One of the data processing instructions + return decode_alu(insn); +} + +Opcode Arm::decode01(uint32_t insn) { + uint8_t is_reg = (insn >> 25) & 0x1; + uint8_t bit4 = (insn >> 4) & 0x1; + if (is_reg == 1 && bit4 == 1) + return OP_UNDEFINED; + uint8_t is_load = (insn >> 20) & 0x1; + uint8_t is_byte = (insn >> 22) & 0x1; + if ((insn & 0xfd70f000) == 0xf550f000) { + // Pre-load + return OP_PLD; + } + if (is_load) { + if (is_byte) { + // Load byte + return OP_LDRB; + } + // Load word + return OP_LDR; + } + if (is_byte) { + // Store byte + return OP_STRB; + } + // Store word + return OP_STR; +} + +Opcode Arm::decode10(uint32_t insn) { + uint8_t bit25 = (insn >> 25) & 0x1; + if (bit25 == 0) { + // LDM/STM + uint8_t is_load = (insn >> 20) & 0x1; + if (is_load) + return OP_LDM; + return OP_STM; + } + // Branch or Branch with link + uint8_t is_link = (insn >> 24) & 1; + uint32_t offset = insn & 0xffffff; + + // Sign-extend the 24-bit offset + if ((offset >> 23) & 1) + offset |= 0xff000000; + + // Pre-compute the left-shift and the prefetch offset + offset <<= 2; + offset += 8; + if (is_link == 0) + return OP_B; + return OP_BL; +} + +Opcode Arm::decode11(uint32_t insn) { + uint8_t bit25 = (insn >> 25) & 0x1; + if (bit25 == 0) { + // LDC, SDC + uint8_t is_load = (insn >> 20) & 0x1; + if (is_load) { + // LDC + return OP_LDC; + } + // STC + return OP_STC; + } + + uint8_t bit24 = (insn >> 24) & 0x1; + if (bit24 == 0x1) { + // SWI + return OP_SWI; + } + + uint8_t bit4 = (insn >> 4) & 0x1; + uint8_t cpnum = (insn >> 8) & 0xf; + + if (cpnum == 15) { + // Special case for coprocessor 15 + uint8_t opcode = (insn >> 21) & 0x7; + if (bit4 == 0 || opcode != 0) { + // This is an unexpected bit pattern. Create an undefined + // instruction in case this is ever executed. + return OP_UNDEFINED; + } + + // MRC, MCR + uint8_t is_mrc = (insn >> 20) & 0x1; + if (is_mrc) + return OP_MRC; + return OP_MCR; + } + + if (bit4 == 0) { + // CDP + return OP_CDP; + } + // MRC, MCR + uint8_t is_mrc = (insn >> 20) & 0x1; + if (is_mrc) + return OP_MRC; + return OP_MCR; +} + +Opcode Arm::decode_mul(uint32_t insn) { + uint8_t bit24 = (insn >> 24) & 0x1; + if (bit24 != 0) { + // This is an unexpected bit pattern. Create an undefined + // instruction in case this is ever executed. + return OP_UNDEFINED; + } + uint8_t bit23 = (insn >> 23) & 0x1; + uint8_t bit22_U = (insn >> 22) & 0x1; + uint8_t bit21_A = (insn >> 21) & 0x1; + if (bit23 == 0) { + // 32-bit multiply + if (bit22_U != 0) { + // This is an unexpected bit pattern. Create an undefined + // instruction in case this is ever executed. + return OP_UNDEFINED; + } + if (bit21_A == 0) + return OP_MUL; + return OP_MLA; + } + // 64-bit multiply + if (bit22_U == 0) { + // Unsigned multiply long + if (bit21_A == 0) + return OP_UMULL; + return OP_UMLAL; + } + // Signed multiply long + if (bit21_A == 0) + return OP_SMULL; + return OP_SMLAL; +} + +Opcode Arm::decode_ldrh(uint32_t insn) { + uint8_t is_load = (insn >> 20) & 0x1; + uint8_t bits_65 = (insn >> 5) & 0x3; + if (is_load) { + if (bits_65 == 0x1) { + // Load unsigned halfword + return OP_LDRH; + } else if (bits_65 == 0x2) { + // Load signed byte + return OP_LDRSB; + } + // Signed halfword + if (bits_65 != 0x3) { + // This is an unexpected bit pattern. Create an undefined + // instruction in case this is ever executed. + return OP_UNDEFINED; + } + // Load signed halfword + return OP_LDRSH; + } + // Store halfword + if (bits_65 != 0x1) { + // This is an unexpected bit pattern. Create an undefined + // instruction in case this is ever executed. + return OP_UNDEFINED; + } + // Store halfword + return OP_STRH; +} + +Opcode Arm::decode_alu(uint32_t insn) { + uint8_t is_immed = (insn >> 25) & 0x1; + uint8_t opcode = (insn >> 21) & 0xf; + uint8_t bit_s = (insn >> 20) & 1; + uint8_t shift_is_reg = (insn >> 4) & 1; + uint8_t bit7 = (insn >> 7) & 1; + if (!is_immed && shift_is_reg && (bit7 != 0)) { + // This is an unexpected bit pattern. Create an undefined + // instruction in case this is ever executed. + return OP_UNDEFINED; + } + switch (opcode) { + case 0x0: + return OP_AND; + case 0x1: + return OP_EOR; + case 0x2: + return OP_SUB; + case 0x3: + return OP_RSB; + case 0x4: + return OP_ADD; + case 0x5: + return OP_ADC; + case 0x6: + return OP_SBC; + case 0x7: + return OP_RSC; + case 0x8: + if (bit_s) + return OP_TST; + return OP_MRS; + case 0x9: + if (bit_s) + return OP_TEQ; + return OP_MSR; + case 0xa: + if (bit_s) + return OP_CMP; + return OP_MRS; + case 0xb: + if (bit_s) + return OP_CMN; + return OP_MSR; + case 0xc: + return OP_ORR; + case 0xd: + return OP_MOV; + case 0xe: + return OP_BIC; + case 0xf: + return OP_MVN; + } + // Unreachable + return OP_INVALID; +}
\ No newline at end of file diff --git a/src/core/src/arm/disassembler/arm_disasm.h b/src/core/src/arm/disassembler/arm_disasm.h new file mode 100644 index 000000000..15c7bb557 --- /dev/null +++ b/src/core/src/arm/disassembler/arm_disasm.h @@ -0,0 +1,146 @@ +// Copyright 2006 The Android Open Source Project + +#ifndef ARMDIS_H +#define ARMDIS_H + +#include <stdint.h> + +// Note: this list of opcodes must match the list used to initialize +// the opflags[] array in opcode.cpp. +enum Opcode { + OP_INVALID, + OP_UNDEFINED, + OP_ADC, + OP_ADD, + OP_AND, + OP_B, + OP_BL, + OP_BIC, + OP_BKPT, + OP_BLX, + OP_BX, + OP_CDP, + OP_CLZ, + OP_CMN, + OP_CMP, + OP_EOR, + OP_LDC, + OP_LDM, + OP_LDR, + OP_LDRB, + OP_LDRBT, + OP_LDRH, + OP_LDRSB, + OP_LDRSH, + OP_LDRT, + OP_MCR, + OP_MLA, + OP_MOV, + OP_MRC, + OP_MRS, + OP_MSR, + OP_MUL, + OP_MVN, + OP_ORR, + OP_PLD, + OP_RSB, + OP_RSC, + OP_SBC, + OP_SMLAL, + OP_SMULL, + OP_STC, + OP_STM, + OP_STR, + OP_STRB, + OP_STRBT, + OP_STRH, + OP_STRT, + OP_SUB, + OP_SWI, + OP_SWP, + OP_SWPB, + OP_TEQ, + OP_TST, + OP_UMLAL, + OP_UMULL, + + // Define thumb opcodes + OP_THUMB_UNDEFINED, + OP_THUMB_ADC, + OP_THUMB_ADD, + OP_THUMB_AND, + OP_THUMB_ASR, + OP_THUMB_B, + OP_THUMB_BIC, + OP_THUMB_BKPT, + OP_THUMB_BL, + OP_THUMB_BLX, + OP_THUMB_BX, + OP_THUMB_CMN, + OP_THUMB_CMP, + OP_THUMB_EOR, + OP_THUMB_LDMIA, + OP_THUMB_LDR, + OP_THUMB_LDRB, + OP_THUMB_LDRH, + OP_THUMB_LDRSB, + OP_THUMB_LDRSH, + OP_THUMB_LSL, + OP_THUMB_LSR, + OP_THUMB_MOV, + OP_THUMB_MUL, + OP_THUMB_MVN, + OP_THUMB_NEG, + OP_THUMB_ORR, + OP_THUMB_POP, + OP_THUMB_PUSH, + OP_THUMB_ROR, + OP_THUMB_SBC, + OP_THUMB_STMIA, + OP_THUMB_STR, + OP_THUMB_STRB, + OP_THUMB_STRH, + OP_THUMB_SUB, + OP_THUMB_SWI, + OP_THUMB_TST, + + OP_END // must be last +}; + +class Arm { + public: + static char *disasm(uint32_t addr, uint32_t insn, char *buffer); + static Opcode decode(uint32_t insn); + + private: + static Opcode decode00(uint32_t insn); + static Opcode decode01(uint32_t insn); + static Opcode decode10(uint32_t insn); + static Opcode decode11(uint32_t insn); + static Opcode decode_mul(uint32_t insn); + static Opcode decode_ldrh(uint32_t insn); + static Opcode decode_alu(uint32_t insn); + + static char *disasm_alu(Opcode opcode, uint32_t insn, char *ptr); + static char *disasm_branch(uint32_t addr, Opcode opcode, uint32_t insn, char *ptr); + static char *disasm_bx(uint32_t insn, char *ptr); + static char *disasm_bkpt(uint32_t insn, char *ptr); + static char *disasm_clz(uint32_t insn, char *ptr); + static char *disasm_memblock(Opcode opcode, uint32_t insn, char *ptr); + static char *disasm_mem(uint32_t insn, char *ptr); + static char *disasm_memhalf(uint32_t insn, char *ptr); + static char *disasm_mcr(Opcode opcode, uint32_t insn, char *ptr); + static char *disasm_mla(Opcode opcode, uint32_t insn, char *ptr); + static char *disasm_umlal(Opcode opcode, uint32_t insn, char *ptr); + static char *disasm_mul(Opcode opcode, uint32_t insn, char *ptr); + static char *disasm_mrs(uint32_t insn, char *ptr); + static char *disasm_msr(uint32_t insn, char *ptr); + static char *disasm_pld(uint32_t insn, char *ptr); + static char *disasm_swi(uint32_t insn, char *ptr); + static char *disasm_swp(Opcode opcode, uint32_t insn, char *ptr); +}; + +extern char *disasm_insn_thumb(uint32_t pc, uint32_t insn1, uint32_t insn2, char *result); +extern Opcode decode_insn_thumb(uint32_t given); + +#endif /* ARMDIS_H */ |