def arm_sub(ctx, i):
a = operand.get(ctx, i, 0)
b = operand.get(ctx, i, 1)
print i.update_flags
print dir(i)
def arm_sub(ctx, i):
a = operand.get(ctx, i, 0)
b = operand.get(ctx, i, 1)
print i.update_flags
print dir(i)
def arm_stm(ctx, i):
value = operand.get(ctx, i, 0)
address = operand.get(ctx, i, 1)
ctx.emit(stm_(value, address))
if i.writeback:
operand.writeback(ctx, i, 1)
def arm_stm(ctx, i):
value = operand.get(ctx, i, 0)
address = operand.get(ctx, i, 1)
ctx.emit( stm_ (value, address))
if i.writeback:
operand.writeback(ctx, i, 1)
def _arm_mov(ctx, i):
prev_value = operand.get(ctx, i, 1)
value = ctx.tmp(ctx.word_size)
ctx.emit(str_(prev_value, value))
if i.update_flags:
set_N(ctx, value)
set_Z(ctx, value)
operand.set(ctx, i, 0, value)
def arm_blx(ctx, i):
target = operand.get(ctx, i, 0)
pc = operand.get_register(ctx, i, 'pc')
if ctx.thumb:
prev_pc = pc
pc = ctx.tmp(32)
ctx.emit( or_ (prev_pc, imm(1, 32), pc))
operand.set_register(ctx, i, 'lr', pc)
ctx.emit( jcc_ (imm(1, 8), target))
def _arm_mov(ctx, i):
prev_value = operand.get(ctx, i, 1)
value = ctx.tmp(ctx.word_size)
ctx.emit( str_ (prev_value, value))
if i.update_flags:
set_N(ctx, value)
set_Z(ctx, value)
operand.set(ctx, i, 0, value)
def arm_movt(ctx, i):
# first extract the low 16 bits of the destination
prev_value = operand.get(ctx, i, 0)
value = ctx.tmp(ctx.word_size)
ctx.emit(and_(prev_value, imm(mask(16), 32), value))
# then compute the high 16 bits
prev_result = operand.get(ctx, i, 1)
result = ctx.tmp(ctx.word_size)
ctx.emit(str_(prev_result, result))
ctx.emit(lshl_(result, imm(16, 32), result))
ctx.emit(or_(value, result, result))
if i.update_flags:
set_N(ctx, result)
set_Z(ctx, result)
operand.set(ctx, i, 0, result)
def arm_add(ctx, i):
if len(i.operands) == 3:
dst_idx = 0
a_idx = 1
b_idx = 2
else:
dst_idx = 0
a_idx = 0
b_idx = 1
a = operand.get(ctx, i, a_idx)
b = operand.get(ctx, i, b_idx)
result = ctx.tmp(a.size * 2)
ctx.emit( add_ (a, b, result))
if i.update_flags:
raise NotImplementedError()
operand.set(ctx, i, dst_idx, result)
def arm_add(ctx, i):
if len(i.operands) == 3:
dst_idx = 0
a_idx = 1
b_idx = 2
else:
dst_idx = 0
a_idx = 0
b_idx = 1
a = operand.get(ctx, i, a_idx)
b = operand.get(ctx, i, b_idx)
result = ctx.tmp(a.size * 2)
ctx.emit(add_(a, b, result))
if i.update_flags:
raise NotImplementedError()
operand.set(ctx, i, dst_idx, result)
def arm_movt(ctx, i):
# first extract the low 16 bits of the destination
prev_value = operand.get(ctx, i, 0)
value = ctx.tmp(ctx.word_size)
ctx.emit( and_ (prev_value, imm(mask(16), 32), value))
# then compute the high 16 bits
prev_result = operand.get(ctx, i, 1)
result = ctx.tmp(ctx.word_size)
ctx.emit( str_ (prev_result, result))
ctx.emit( lshl_ (result, imm(16, 32), result))
ctx.emit( or_ (value, result, result))
if i.update_flags:
set_N(ctx, result)
set_Z(ctx, result)
operand.set(ctx, i, 0, result)
def arm_push(ctx, i):
for op in i.operands:
value = operand.get(ctx, i, 0)
ctx.emit(
sub_(ctx.stack_ptr, imm(ctx.word_size // 8, ctx.word_size),
ctx.stack_ptr))
if value.size != ctx.word_size:
prev_value = value
value = ctx.tmp(ctx.word_size)
ctx.emit(sex_(prev_value, value))
ctx.emit(stm_(value, ctx.stack_ptr))
def arm_push(ctx, i):
for op in i.operands:
value = operand.get(ctx, i, 0)
ctx.emit( sub_ (ctx.stack_ptr,
imm(ctx.word_size // 8, ctx.word_size),
ctx.stack_ptr))
if value.size != ctx.word_size:
prev_value = value
value = ctx.tmp(ctx.word_size)
ctx.emit( sex_ (prev_value, value))
ctx.emit( stm_ (value, ctx.stack_ptr))
def arm_str(ctx, i):
value = operand.get(ctx, i, 1)
operand.set(ctx, i, 0, value)
def arm_b(ctx, i):
target = operand.get(ctx, i, 0)
ctx.emit( jcc_ (imm(1, 8), target))
def arm_str(ctx, i):
value = operand.get(ctx, i, 1)
operand.set(ctx, i, 0, value)