// license:BSD-3-Clause // copyright-holders:Bryan McPhail,Phil Stroffolino /* ARM 2/3 disassembler (c) 2002-2006 Bryan McPhail (bmcphail@tendril.co.uk) and Phil Stroffolino */ #include "emu.h" #include "arm.h" static void WriteImmediateOperand( std::ostream &stream, uint32_t opcode ) { /* rrrrbbbbbbbb */ uint32_t imm; int r; imm = opcode&0xff; r = ((opcode>>8)&0xf)*2; imm = (imm>>r)|(r?(imm<<(32-r)):0); util::stream_format( stream, ", #$%x", imm ); } static void WriteDataProcessingOperand( std::ostream &stream, uint32_t opcode, int printOp0, int printOp1, int printOp2 ) { /* ccccctttmmmm */ static const char *const pRegOp[4] = { "LSL","LSR","ASR","ROR" }; if (printOp0) util::stream_format(stream, "R%d, ", (opcode>>12)&0xf); if (printOp1) util::stream_format(stream, "R%d, ", (opcode>>16)&0xf); /* Immediate Op2 */ if (opcode & 0x02000000) { stream.seekp(-2, std::ios_base::cur); WriteImmediateOperand(stream, opcode); return; } /* Register Op2 */ if (printOp2) util::stream_format(stream, "R%d, ", (opcode>>0)&0xf); util::stream_format(stream, "%s ", pRegOp[(opcode>>5)&3]); if( opcode&0x10 ) /* Shift amount specified in bottom bits of RS */ { util::stream_format( stream, "R%d", (opcode>>8)&0xf ); } else /* Shift amount immediate 5 bit unsigned integer */ { int c=(opcode>>7)&0x1f; if( c==0 ) c = 32; util::stream_format( stream, "#%d", c ); } } static void WriteRegisterOperand1( std::ostream &stream, uint32_t opcode ) { /* ccccctttmmmm */ static const char *const pRegOp[4] = { "LSL","LSR","ASR","ROR" }; util::stream_format( stream, ", R%d %s ", /* Operand 1 register, Operand 2 register, shift type */ (opcode>> 0)&0xf, pRegOp[(opcode>>5)&3]); if( opcode&0x10 ) /* Shift amount specified in bottom bits of RS */ { util::stream_format( stream, "R%d", (opcode>>7)&0xf ); } else /* Shift amount immediate 5 bit unsigned integer */ { int c=(opcode>>7)&0x1f; if( c==0 ) c = 32; util::stream_format( stream, "#%d", c ); } } /* WriteRegisterOperand */ static void WriteBranchAddress( std::ostream &stream, uint32_t pc, uint32_t opcode ) { opcode &= 0x00ffffff; if( opcode&0x00800000 ) { opcode |= 0xff000000; /* sign-extend */ } pc += 8+4*opcode; util::stream_format( stream, "$%x", pc ); } /* WriteBranchAddress */ static void WritePadding(std::ostream &stream, std::streampos start_position) { std::streamoff difference = stream.tellp() - start_position; for (std::streamoff i = difference; i < 8; i++) stream << ' '; } static uint32_t arm_disasm( std::ostream &stream, uint32_t pc, uint32_t opcode ) { static const char *const pConditionCodeTable[16] = { "EQ","NE","CS","CC", "MI","PL","VS","VC", "HI","LS","GE","LT", "GT","LE","","NV" }; static const char *const pOperation[16] = { "AND","EOR","SUB","RSB", "ADD","ADC","SBC","RSC", "TST","TEQ","CMP","CMN", "ORR","MOV","BIC","MVN" }; const char *pConditionCode; uint32_t dasmflags = 0; std::streampos start_position = stream.tellp(); pConditionCode= pConditionCodeTable[opcode>>28]; if( (opcode&0x0fc000f0)==0x00000090u ) { /* multiply */ /* xxxx0000 00ASdddd nnnnssss 1001mmmm */ if( opcode&0x00200000 ) { util::stream_format( stream, "MLA" ); } else { util::stream_format( stream, "MUL" ); } util::stream_format( stream, "%s", pConditionCode ); if( opcode&0x00100000 ) { stream << 'S'; } WritePadding(stream, start_position); util::stream_format(stream, "R%d, R%d, R%d", (opcode>>16)&0xf, (opcode&0xf), (opcode>>8)&0xf); if( opcode&0x00200000 ) { util::stream_format( stream, ", R%d", (opcode>>12)&0xf ); } } else if( (opcode&0x0c000000)==0 ) { int op=(opcode>>21)&0xf; /* Data Processing */ /* xxxx001a aaaSnnnn ddddrrrr bbbbbbbb */ /* xxxx000a aaaSnnnn ddddcccc ctttmmmm */ util::stream_format(stream, "%s%s", pOperation[op], pConditionCode); if( (opcode&0x01000000) ) { stream << 'S'; } WritePadding(stream, start_position); switch (op) { case 0x00: case 0x01: case 0x02: case 0x03: case 0x04: case 0x05: case 0x06: case 0x07: case 0x0c: case 0x0e: WriteDataProcessingOperand(stream, opcode, 1, 1, 1); break; case 0x08: case 0x09: case 0x0a: case 0x0b: WriteDataProcessingOperand(stream, opcode, 0, 1, 1); break; case 0x0d: /* look for mov pc,lr */ if (((opcode >> 12) & 0x0f) == 15 && ((opcode >> 0) & 0x0f) == 14 && (opcode & 0x02000000) == 0) dasmflags = DASMFLAG_STEP_OUT; case 0x0f: WriteDataProcessingOperand(stream, opcode, 1, 0, 1); break; } } else if( (opcode&0x0c000000)==0x04000000 ) { /* Data Transfer */ /* xxxx010P UBWLnnnn ddddoooo oooooooo Immediate form */ /* xxxx011P UBWLnnnn ddddcccc ctt0mmmm Register form */ if( opcode&0x00100000 ) { util::stream_format( stream, "LDR" ); } else { util::stream_format( stream, "STR" ); } util::stream_format( stream, "%s", pConditionCode ); if( opcode&0x00400000 ) { util::stream_format( stream, "B" ); } if( opcode&0x00200000 ) { /* writeback addr */ if( opcode&0x01000000 ) { /* pre-indexed addressing */ util::stream_format( stream, "!" ); } else { /* post-indexed addressing */ util::stream_format( stream, "T" ); } } WritePadding(stream, start_position); util::stream_format( stream, "R%d, [R%d", (opcode>>12)&0xf, (opcode>>16)&0xf ); if( opcode&0x02000000 ) { /* register form */ WriteRegisterOperand1( stream, opcode ); util::stream_format( stream, "]" ); } else { /* immediate form */ util::stream_format( stream, "]" ); if( opcode&0x00800000 ) { util::stream_format( stream, ", #$%x", opcode&0xfff ); } else { util::stream_format( stream, ", -#$%x", opcode&0xfff ); } } } else if( (opcode&0x0e000000) == 0x08000000 ) { /* xxxx100P USWLnnnn llllllll llllllll */ /* Block Data Transfer */ if( opcode&0x00100000 ) { util::stream_format( stream, "LDM" ); } else { util::stream_format( stream, "STM" ); } util::stream_format( stream, "%s", pConditionCode ); if( opcode&0x01000000 ) { util::stream_format( stream, "P" ); } if( opcode&0x00800000 ) { util::stream_format( stream, "U" ); } if( opcode&0x00400000 ) { util::stream_format( stream, "^" ); } if( opcode&0x00200000 ) { util::stream_format( stream, "W" ); } WritePadding(stream, start_position); util::stream_format( stream, "[R%d], {",(opcode>>16)&0xf); { int j=0,last=0,found=0; for (j=0; j<16; j++) { if (opcode&(1<>12)&0xf, (opcode>>16)&0xf, (opcode>>0)&0xf, (opcode>>5)&0x7); /* Nb: full form should be o, p, R, CR, CRM, q */ } else if( (opcode&0x0f000010)==0x0e000000 ) { util::stream_format( stream, "CDP" ); util::stream_format( stream, "%s", pConditionCode ); WritePadding(stream, start_position); util::stream_format( stream, "%08x", opcode ); } else { util::stream_format( stream, "???" ); } } else if( (opcode&0x0f000000) == 0x0f000000 ) { /* Software Interrupt */ util::stream_format( stream, "SWI%s $%x", pConditionCode, opcode&0x00ffffff ); dasmflags = DASMFLAG_STEP_OVER; } else { util::stream_format( stream, "Undefined" ); } return dasmflags | DASMFLAG_SUPPORTED; } CPU_DISASSEMBLE( arm ) { uint32_t opcode = oprom[0] | (oprom[1] << 8) | (oprom[2] << 16) | (oprom[3] << 24); return 4 | arm_disasm(stream, pc, opcode); } CPU_DISASSEMBLE( arm_be ) { uint32_t opcode = oprom[3] | (oprom[2] << 8) | (oprom[1] << 16) | (oprom[0] << 24); return 4 | arm_disasm(stream, pc, opcode); }