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arch_m68k.py
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arch_m68k.py
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"""
* Unravel
* Interactive Disassembler
* (c) 2013 Tiago Rezende
*
* Motorola 68k driver
"""
from unravel_base import *
def M68K_Invalid_Insn(op, at, image):
return Insn('invalid', ['invalid'], at, 2, {}, [])
def M68K_decode_size_A(op):
size_field = (op & (0x60)) >> 6
sizes = [
{id: "b", size:1},
{id: "w", size:2},
{id: "l", size:4},
False
]
return sizes[size]
def M68K_decode_addr_mode_A_data_reg(op, at, image):
reg_field = (op & 7)
return {mnemonic: 'd'+reg_field, mode: ['direct', 'register', 'data'], extra: 0}
def M68K_decode_addr_mode_A_addr_reg(op, at, image):
reg_field = (op & 7)
return {mnemonic: 'a'+reg_field, mode: ['direct', 'register', 'addr'], extra: 0}
def M68K_decode_addr_mode_A_addr(op, at, image):
reg_field = (op & 7)
return {mnemonic: '(a'+reg_field+')', mode: ['indirect', 'register', 'addr'], extra: 0}
def M68K_decode_addr_mode_A_addr_postinc(op, at, image):
reg_field = (op & 7)
return {mnemonic: '(a'+reg_field+')+', mode: ['indirect', 'register', 'addr', 'postinc'], extra: 0}
def M68K_decode_addr_mode_A_addr_predec(op, at, image):
reg_field = (op & 7)
return {mnemonic: '-(a'+reg_field+')', mode: ['indirect', 'register', 'addr', 'predec'], extra: 0}
def M68K_decode_addr_mode_A_addr_index(op, at, image):
reg_field = (op & 7)
disp = image.read16(at+2)
reg2_field = (disp &0xf00)>>8
scale =
disp = disp & 0xff
if disp >= 0x80:
disp -= 0x100
return {mnemonic: '(a'+reg_field+')', mode: ['indirect', 'register', 'addr', 'displacement'], extra: 2}
def M68K_decode_addr_mode_A_addr_disp(op, at, image):
reg_field = (op & 7)
disp = image.read16(at+2)
if disp >= 0x8000:
disp -= 0x10000
return {mnemonic: '(a'+reg_field+')', mode: ['indirect', 'register', 'addr', 'displacement'], extra: 2}
def M68K_decode_addr_mode_A_abs_short(op, at, image):
disp = image.read16(at+2)
if disp >= 0x8000:
disp += 0xffff0000
return {mnemonic: "(0x%x)"%(disp), mode: ['absolute', 'short'], extra: 2}
def M68K_decode_addr_mode_A_abs_long(op, at, image):
disp = image.read32(at+2)
return {mnemonic: "(0x%x)"%(disp), mode: ['absolute', 'long'], extra: 2}
def M68K_decode_addr_mode_A_pc_disp(op, at, image):
disp = image.read16(at+2)
if disp >= 0x8000:
disp -= 0x10000
return {mnemonic: "(0x%x, pc)"%(disp), mode: ['pc', 'relative', 'short', 'displacement'], displacement:disp, extra: 2}
def M68K_decode_addr_mode_A(op):
mode_field = (op & 0x38) >> 3
if mode_field is 7:
return M68K_decode_addr_mode_A_other(op)
else:
modes = [
{type: 'data_reg', reader: M68K_decode_addr_mode_A_data_reg},
{type: 'addr_reg', reader: M68K_decode_addr_mode_A_addr_reg},
{type: 'addr', reader: M68K_decode_addr_mode_A_addr},
{type: 'addr_postinc', reader: M68K_decode_addr_mode_A_addr_postinc},
{type: 'addr_predec', reader: M68K_decode_addr_mode_A_addr_predec},
{type: 'addr_disp', reader: M68K_decode_addr_mode_A_addr_disp},
{type: 'addr_index', reader: M68K_decode_addr_mode_A_addr_index},
]
return modes[mode_field]
def M68K_decode_addr_mode_A_other(op):
mode_field = (op & 7)
modes = [
{type: 'abs_short', reader: M68K_decode_addr_mode_A_abs_short},
{type: 'abs_long', reader: M68K_decode_addr_mode_A_abs_long},
{type: 'pc_disp', reader: M68K_decode_addr_mode_A_pc_disp},
{type: 'pc_index', reader: M68K_decode_addr_mode_A_pc_index},
{type: 'imm', reader: M68K_decode_addr_mode_A_imm},
None,
None,
None
]
return modes[mode_field]
m68k_addr_mode = [
'data_reg',
'addr_reg',
'addr',
'addr_postinc',
'addr_predec',
'addr_disp',
'addr_index',
'other'
]
m68k_addr_other = [
'abs_short',
'abs_long',
'pc_disp',
'pc_index',
'imm'
]
def M68K_decode_move(op, at, image):
mode_dest = (op >> 6) & 7
mode_src = (op >> 3) & 7
dest_reg = (op >> 9) & 7
src_reg = op & 7
def M68K_MOVEB_Insn(op, at, image):
pass
def M68K_MOVEW_Insn(op, at, image):
pass
def M68K_MOVEL_Insn(op, at, image):
pass
condition_codes = [
{cc: "t", descr: 'true'},
{cc: "f", descr: 'false'},
{cc: "hi", descr: 'higher'},
{cc: "ls", descr: 'lower or same'},
{cc: "cc", descr: 'carry clear'},
{cc: "cs", descr: 'carry set'},
{cc: "ne", descr: 'not equal'},
{cc: "eq", descr: 'equal'},
{cc: "vc", descr: 'overflow clear'},
{cc: "vs", descr: 'overflow set'},
{cc: "pl", descr: 'plus'},
{cc: "mi", descr: 'minus'},
{cc: "ge", descr: 'greater or equal'},
{cc: "lt", descr: 'less than'},
{cc: "gt", descr: 'greater than'},
{cc: "le", descr: 'less or equal'}
]
def M68K_Branch_Insn(op, at, image):
cc = (op & 0x0f00)>>8
disp = op & 0xff
size = 2
if disp >= 0x80:
disp -= 0x100
if disp is 0:
size = 4
disp = image.read16(at+2)
if disp >= 0x8000:
disp -= 0x10000
disp += 2
disp += 2
if cc is 0:
return Insn('bra', ['unconditional','branch'], at, size, {displacement: disp}, [Arrow("goto", at+disp)])
else:
cond = condition_codes[cc]
return Insn('br'+cond['cc'], ['conditional','branch'], at, size, {displacement: disp, description: "branch if "+cond['descr']}, [Arrow("goto", at+size), Arrow("goto", at+disp)])
def M68K_MOVEP_Insn(op, at, image, data):
data_reg = (op & 0x0e00) >> 9
addr_reg = op & 0x07
direction = op & 0x80
displacement = 0
if data['size'] == 4:
displacement = image.read32(at+2)
else:
displacement = image.read16(at+2)
return Insn(data['mnemonic'].format({source:s}), ['move', 'peripheral'], at, 2+data['size'])
m68k_insn_patterns = [
{mnemonic: 'abcd', match: 0xc100, mask: 0xf1f0, fn: M68K_Type14_Insn},
{mnemonic: 'adda', match: 0xd0c0, mask: 0xf0c0, fn: M68K_Type3_Insn},
{mnemonic: 'addx', match: 0xd100, mask: 0xf130, fn: M68K_Type14_Insn},
{mnemonic: 'add', match: 0xd000, mask: 0xf000, fn: M68K_Type3_Insn},
{mnemonic: 'cmpm', match: 0xb108, mask: 0xf138, fn: M68K_Type19_Insn},
{mnemonic: 'eor', match: 0xb100, mask: 0xf100, fn: M68K_Type3_Insn},
{mnemonic: 'cmp', match: 0xb000, mask: 0xf100, fn: M68K_Type3_Insn},
{mnemonic: 'reset', match: 0x4e70, mask: 0xffff, fn: M68K_Type10_Insn},
{mnemonic: 'nop', match: 0x4e71, mask: 0xffff, fn: M68K_Type10_Insn},
{mnemonic: 'stop', match: 0x4e72, mask: 0xffff, fn: M68K_Type10_Insn},
{mnemonic: 'rte', match: 0x4e73, mask: 0xffff, fn: M68K_Type10_Insn},
{mnemonic: 'rts', match: 0x4e75, mask: 0xffff, fn: M68K_Type10_Insn},
{mnemonic: 'rtr', match: 0x4e77, mask: 0xffff, fn: M68K_Type10_Insn},
{mnemonic: 'trapv', match: 0x4e76, mask: 0xffff, fn: M68K_Type10_Insn},
{mnemonic: 'illegal', match: 0x4afc, mask: 0xffff, fn: M68K_Type10_Insn},
{mnemonic: 'swap', match: 0x4840, mask: 0xfff8, fn: M68K_Type5_Insn},
{mnemonic: 'unlk', match: 0x4e58, mask: 0xfff8, fn: M68K_Type9_Insn},
{mnemonic: 'link', match: 0x4e50, mask: 0xfff8, fn: M68K_Type1_Insn},
{mnemonic: 'trap', match: 0x4e40, mask: 0xfff0, fn: M68K_Type24_Insn},
{mnemonic: 'tas', match: 0x4ac0, mask: 0xffc0, fn: M68K_Type5_Insn},
{mnemonic: 'jmp', match: 0x4ec0, mask: 0xffc0, fn: M68K_Type5_Insn},
{mnemonic: 'jsr', match: 0x4e80, mask: 0xffc0, fn: M68K_Type5_Insn},
{mnemonic: 'move {ea}, usp', match: 0x4e60, mask: 0xfff8, fn: M68K_Type28_Insn, direction:'reg'},
{mnemonic: 'move usp, {ea}', match: 0x4e68, mask: 0xfff8, fn: M68K_Type28_Insn, direction:'mem'},
{mnemonic: 'move ccr, {ea}', match: 0x42c0, mask: 0xffc0, fn: M68K_Type26_Insn, direction:'mem'},
{mnemonic: 'move {ea}, ccr', match: 0x44c0, mask: 0xffc0, fn: M68K_Type26_Insn, direction:'reg'},
{mnemonic: 'move sr, {ea}', match: 0x40c0, mask: 0xffc0, fn: M68K_Type26_Insn, direction:'mem'},
{mnemonic: 'move {ea}, sr', match: 0x46c0, mask: 0xffc0, fn: M68K_Type26_Insn, direction:'reg'},
{mnemonic: 'nbcd', match: 0x4800, mask: 0xffc0, fn: M68K_Type15_Insn},
{mnemonic: 'pea', match: 0x4840, mask: 0xffc0, fn: M68K_Type5_Insn},
{mnemonic: 'ext', match: 0x4800, mask: 0xfe30, fn: M68K_Type12_Insn},
{mnemonic: 'movem', match: 0x4880, mask: 0xfb80, fn: M68K_Type23_Insn},
{mnemonic: 'chk', match: 0x4180, mask: 0xf1c0, fn: M68K_Type16_Insn},
{mnemonic: 'lea', match: 0x41c0, mask: 0xf1c0, fn: M68K_Type2_Insn},
{mnemonic: 'tst', match: 0x4a00, mask: 0xff00, fn: M68K_Type7_Insn},
{mnemonic: 'clr', match: 0x4200, mask: 0xff00, fn: M68K_Type15_Insn},
{mnemonic: 'neg', match: 0x4400, mask: 0xff00, fn: M68K_Type15_Insn},
{mnemonic: 'negx', match: 0x4000, mask: 0xff00, fn: M68K_Type15_Insn},
{mnemonic: 'not', match: 0x4600, mask: 0xff00, fn: M68K_Type15_Insn},
{mnemonic: 'dbt', match: 0x50c8, mask: 0xfff8, fn: M68K_Type17_Insn},
{mnemonic: 'dbf', match: 0x51c8, mask: 0xfff8, fn: M68K_Type17_Insn},
{mnemonic: 'dbhi', match: 0x52c8, mask: 0xfff8, fn: M68K_Type17_Insn},
{mnemonic: 'dbls', match: 0x53c8, mask: 0xfff8, fn: M68K_Type17_Insn},
{mnemonic: 'dbcc', match: 0x54c8, mask: 0xfff8, fn: M68K_Type17_Insn},
{mnemonic: 'dbcs', match: 0x55c8, mask: 0xfff8, fn: M68K_Type17_Insn},
{mnemonic: 'dbne', match: 0x56c8, mask: 0xfff8, fn: M68K_Type17_Insn},
{mnemonic: 'dbeq', match: 0x57c8, mask: 0xfff8, fn: M68K_Type17_Insn},
{mnemonic: 'dbvc', match: 0x58c8, mask: 0xfff8, fn: M68K_Type17_Insn},
{mnemonic: 'dbvs', match: 0x59c8, mask: 0xfff8, fn: M68K_Type17_Insn},
{mnemonic: 'dbpl', match: 0x5ac8, mask: 0xfff8, fn: M68K_Type17_Insn},
{mnemonic: 'dbmi', match: 0x5bc8, mask: 0xfff8, fn: M68K_Type17_Insn},
{mnemonic: 'dbge', match: 0x5cc8, mask: 0xfff8, fn: M68K_Type17_Insn},
{mnemonic: 'dblt', match: 0x5dc8, mask: 0xfff8, fn: M68K_Type17_Insn},
{mnemonic: 'dbgt', match: 0x5ec8, mask: 0xfff8, fn: M68K_Type17_Insn},
{mnemonic: 'dble', match: 0x5fc8, mask: 0xfff8, fn: M68K_Type17_Insn},
{mnemonic: 'st', match: 0x50c0, mask: 0xfff8, fn: M68K_Type5_Insn},
{mnemonic: 'sf', match: 0x51c0, mask: 0xfff8, fn: M68K_Type5_Insn},
{mnemonic: 'shi', match: 0x52c0, mask: 0xfff8, fn: M68K_Type5_Insn},
{mnemonic: 'sls', match: 0x53c0, mask: 0xfff8, fn: M68K_Type5_Insn},
{mnemonic: 'scc', match: 0x54c0, mask: 0xfff8, fn: M68K_Type5_Insn},
{mnemonic: 'scs', match: 0x55c0, mask: 0xfff8, fn: M68K_Type5_Insn},
{mnemonic: 'sne', match: 0x56c0, mask: 0xfff8, fn: M68K_Type5_Insn},
{mnemonic: 'seq', match: 0x57c0, mask: 0xfff8, fn: M68K_Type5_Insn},
{mnemonic: 'svc', match: 0x58c0, mask: 0xfff8, fn: M68K_Type5_Insn},
{mnemonic: 'svs', match: 0x59c0, mask: 0xfff8, fn: M68K_Type5_Insn},
{mnemonic: 'spl', match: 0x5ac0, mask: 0xfff8, fn: M68K_Type5_Insn},
{mnemonic: 'smi', match: 0x5bc0, mask: 0xfff8, fn: M68K_Type5_Insn},
{mnemonic: 'sge', match: 0x5cc0, mask: 0xfff8, fn: M68K_Type5_Insn},
{mnemonic: 'slt', match: 0x5dc0, mask: 0xfff8, fn: M68K_Type5_Insn},
{mnemonic: 'sgt', match: 0x5ec0, mask: 0xfff8, fn: M68K_Type5_Insn},
{mnemonic: 'sle', match: 0x5fc0, mask: 0xfff8, fn: M68K_Type5_Insn},
{mnemonic: 'bt', match: 0x6000, mask: 0xff00, fn: M68K_Type8_Insn},
{mnemonic: 'bf', match: 0x6100, mask: 0xff00, fn: M68K_Type8_Insn},
{mnemonic: 'bhi', match: 0x6200, mask: 0xff00, fn: M68K_Type8_Insn},
{mnemonic: 'bls', match: 0x6300, mask: 0xff00, fn: M68K_Type8_Insn},
{mnemonic: 'bcc', match: 0x6400, mask: 0xff00, fn: M68K_Type8_Insn},
{mnemonic: 'bcs', match: 0x6500, mask: 0xff00, fn: M68K_Type8_Insn},
{mnemonic: 'bne', match: 0x6600, mask: 0xff00, fn: M68K_Type8_Insn},
{mnemonic: 'beq', match: 0x6700, mask: 0xff00, fn: M68K_Type8_Insn},
{mnemonic: 'bvc', match: 0x6800, mask: 0xff00, fn: M68K_Type8_Insn},
{mnemonic: 'bvs', match: 0x6900, mask: 0xff00, fn: M68K_Type8_Insn},
{mnemonic: 'bpl', match: 0x6a00, mask: 0xff00, fn: M68K_Type8_Insn},
{mnemonic: 'bmi', match: 0x6b00, mask: 0xff00, fn: M68K_Type8_Insn},
{mnemonic: 'bge', match: 0x6c00, mask: 0xff00, fn: M68K_Type8_Insn},
{mnemonic: 'blt', match: 0x6d00, mask: 0xff00, fn: M68K_Type8_Insn},
{mnemonic: 'bgt', match: 0x6e00, mask: 0xff00, fn: M68K_Type8_Insn},
{mnemonic: 'ble', match: 0x6f00, mask: 0xff00, fn: M68K_Type8_Insn},
{mnemonic: 'addq', match: 0x5000, mask: 0xf100, fn: M68K_Type6_Insn},
{mnemonic: 'muls', match: 0xc1c0, mask: 0xf1c0, fn: M68K_Type16_Insn},
{mnemonic: 'mulu', match: 0xc0c0, mask: 0xf1c0, fn: M68K_Type16_Insn},
{mnemonic: 'rol', match: 0xe7c0, mask: 0xffc0, fn: M68K_Type11_Insn},
{mnemonic: 'roxl', match: 0xe5c0, mask: 0xffc0, fn: M68K_Type11_Insn},
{mnemonic: 'lsl', match: 0xe3c0, mask: 0xffc0, fn: M68K_Type11_Insn},
{mnemonic: 'asl', match: 0xe100, mask: 0xf118, fn: M68K_Type11_Insn},
{mnemonic: 'asl', match: 0xe1c0, mask: 0xf1c0, fn: M68K_Type11_Insn},
{mnemonic: 'ror', match: 0xe6c0, mask: 0xffc0, fn: M68K_Type11_Insn},
{mnemonic: 'roxr', match: 0xe4c0, mask: 0xffc0, fn: M68K_Type11_Insn},
{mnemonic: 'lsr', match: 0xe2c0, mask: 0xffc0, fn: M68K_Type11_Insn},
{mnemonic: 'asr', match: 0xe000, mask: 0xf118, fn: M68K_Type11_Insn},
{mnemonic: 'asr', match: 0xe0c0, mask: 0xf1c0, fn: M68K_Type11_Insn},
{mnemonic: 'rol', match: 0xe118, mask: 0xf118, fn: M68K_Type11_Insn},
{mnemonic: 'ror', match: 0xe018, mask: 0xf118, fn: M68K_Type11_Insn},
{mnemonic: 'roxl', match: 0xe110, mask: 0xf118, fn: M68K_Type11_Insn},
{mnemonic: 'roxr', match: 0xe010, mask: 0xf118, fn: M68K_Type11_Insn},
{mnemonic: 'move.b', match: 0x1000, mask: 0xf000, fn: M68K_Type4_Insn},
{mnemonic: 'move.l', match: 0x2000, mask: 0xf000, fn: M68K_Type4_Insn},
{mnemonic: 'move.w', match: 0x3000, mask: 0xf000, fn: M68K_Type4_Insn},
{mnemonic: 'moveq', match: 0x7000, mask: 0xf100, fn: M68K_Type22_Insn},
{mnemonic: 'sbcd', match: 0x8100, mask: 0xf1f0, fn: M68K_Type14_Insn},
{mnemonic: 'or', match: 0x8000, mask: 0xf000, fn: M68K_Type3_Insn},
{mnemonic: 'ori #{value}, ccr', match: 0x003c, mask: 0xffff, fn: M68K_Type27_Insn},
{mnemonic: 'ori #{value}, sr', match: 0x007c, mask: 0xffff, fn: M68K_Type27_Insn},
{mnemonic: 'ori #{value}, sr', match: 0x007c, mask: 0xffff, fn: M68K_Type27_Insn},
{mnemonic: 'eori #{value}, ccr', match: 0x0a3c, mask: 0xffff, fn: M68K_Type27_Insn},
{mnemonic: 'eori #{value}, sr', match: 0x0a7c, mask: 0xffff, fn: M68K_Type27_Insn},
{mnemonic: 'andi #{value}, ccr', match: 0x023c, mask: 0xffff, fn: M68K_Type27_Insn},
{mnemonic: 'andi #{value}, sr', match: 0x027c, mask: 0xffff, fn: M68K_Type27_Insn},
{mnemonic: 'movep.w {disp}({addr}), {data}', match: 0x0108, mask: 0xf1f8, fn: M68K_MOVEP_Insn, size: 2, direction:'mem'},
{mnemonic: 'movep.w {data}, {disp}({addr})', match: 0x0188, mask: 0xf1f8, fn: M68K_MOVEP_Insn, size: 2, direction:'reg'},
{mnemonic: 'movep.l {disp}({addr}), {data}', match: 0x0148, mask: 0xf1f8, fn: M68K_MOVEP_Insn, size: 4, direction:'mem'},
{mnemonic: 'movep.l {data}, {disp}({addr})', match: 0x01c8, mask: 0xf1f8, fn: M68K_MOVEP_Insn, size: 4, direction:'reg'},
{mnemonic: 'btst', match: 0x0800, mask: 0xffc0, fn: M68K_Type20_Insn},
{mnemonic: 'bchg', match: 0x0840, mask: 0xffc0, fn: M68K_Type20_Insn},
{mnemonic: 'bclr', match: 0x0880, mask: 0xffc0, fn: M68K_Type20_Insn},
{mnemonic: 'bset', match: 0x08c0, mask: 0xffc0, fn: M68K_Type20_Insn},
{mnemonic: 'ori', match: 0x0000, mask: 0xff00, fn: M68K_Type13_Insn},
{mnemonic: 'addi', match: 0x0600, mask: 0xff00, fn: M68K_Type13_Insn},
{mnemonic: 'andi', match: 0x0200, mask: 0xff00, fn: M68K_Type13_Insn},
{mnemonic: 'subi', match: 0x0400, mask: 0xff00, fn: M68K_Type13_Insn},
{mnemonic: 'eori', match: 0x0a00, mask: 0xff00, fn: M68K_Type13_Insn},
{mnemonic: 'cmpi', match: 0x0c00, mask: 0xff00, fn: M68K_Type13_Insn},
{mnemonic: 'btst', match: 0x0100, mask: 0xf1c0, fn: M68K_Type21_Insn},
{mnemonic: 'bchg', match: 0x0140, mask: 0xf1c0, fn: M68K_Type21_Insn},
{mnemonic: 'bclr', match: 0x0180, mask: 0xf1c0, fn: M68K_Type21_Insn},
{mnemonic: 'bset', match: 0x01c0, mask: 0xf1c0, fn: M68K_Type21_Insn},
{mnemonic: 'subq', match: 0x5100, mask: 0xf100, fn: M68K_Type6_Insn},
{mnemonic: 'suba', match: 0x9000, mask: 0xf0c0, fn: M68K_Type3_Insn},
{mnemonic: 'subx', match: 0x9100, mask: 0xf130, fn: M68K_Type14_Insn},
{mnemonic: 'sub', match: 0x9000, mask: 0xf000, fn: M68K_Type3_Insn},
{mnemonic: 'unknown', match: 0, mask: 0, fn: M68K_Invalid_Insn}
]
class ArchM68K(ArchBigEndian):
def decode(self, image, at):
return TableMatch(self.read16(image, at), at, image, m68k_insn_patterns)