Miasm2: miasm2.arch.arm.arch.arm

Inheritance diagram for miasm2.arch.arm.arch.arm_op2:

Collaboration diagram for miasm2.arch.arm.arch.arm_op2:

Public Member Functions
def	str_to_imm_rot_form

def	decode

def	encode

def	fromstring

Public Attributes
	expr

	value

Static Public Attributes
	parser = shift_off

Detailed Description

Definition at line 896 of file arch.py.

Member Function Documentation

def miasm2.arch.arm.arch.arm_op2.decode	(	self,
		v
	)

Definition at line 908 of file arch.py.

 
     def decode(self, v):
         val = v & self.lmask
         if self.parent.immop.value:
             rot = val >> 8
             imm = val & 0xff
             imm = myror32(imm, rot * 2)
             self.expr = ExprInt32(imm)
             return True
         rm = val & 0xf
         shift = val >> 4
         shift_kind = shift & 1
         shift_type = (shift >> 1) & 3
         shift >>= 3
         # print self.parent.immop.value, hex(shift), hex(shift_kind),
         # hex(shift_type)
         if shift_kind:
             # shift kind is reg
             if shift & 1:
                 # log.debug('error in shift1')
                 return False
             rs = shift >> 1
             if rs == 0xf:
                 # log.debug('error in shift2')
                 return False
             shift_op = regs_expr[rs]
         else:
             # shift kind is imm
             amount = shift
             shift_op = ExprInt32(amount)
         a = regs_expr[rm]
         if shift_op == ExprInt32(0):
             if shift_type == 3:
                 self.expr = ExprOp(allshifts[4], a)
             else:
                 self.expr = a
         else:
             self.expr = ExprOp(allshifts[shift_type], a, shift_op)
         return True

miasm2.core.cpu.myror32

def myror32

Definition: cpu.py:345

miasm2.arch.arm.arch.arm_op2.decode

def decode

Definition: arch.py:908

miasm2.arch.arm.arch.arm_op2.expr

expr

Definition: arch.py:914

miasm2.expression.expression.ExprInt32

def ExprInt32

Definition: expression.py:1157

miasm2.expression.expression.ExprOp

Definition: expression.py:718

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def miasm2.arch.arm.arch.arm_op2.encode ( self )

Definition at line 947 of file arch.py.

 
     def encode(self):
         e = self.expr
         # pure imm
         if isinstance(e, ExprInt):
             val = self.str_to_imm_rot_form(int(e.arg))
             if val is None:
                 return False
             self.parent.immop.value = 1
             self.value = val
             return True
 
         self.parent.immop.value = 0
         # pure reg
         if isinstance(e, ExprId):
             rm = gpregs.expr.index(e)
             shift_kind = 0
             shift_type = 0
             amount = 0
             self.value = (
                 ((((amount << 2) | shift_type) << 1) | shift_kind) << 4) | rm
             return True
         # rot reg
         if not isinstance(e, ExprOp):
             log.debug('bad reg rot1 %r', e)
             return False
         rm = gpregs.expr.index(e.args[0])
         shift_type = allshifts.index(e.op)
         if e.op == 'rrx':
             shift_kind = 0
             amount = 0
             shift_type = 3
         elif isinstance(e.args[1], ExprInt):
             shift_kind = 0
             amount = int(e.args[1].arg)
             # LSR/ASR of 32 => 0
             if amount == 32 and e.op in ['>>', 'a>>']:
                 amount = 0
         else:
             shift_kind = 1
             amount = gpregs.expr.index(e.args[1]) << 1
         self.value = (
             ((((amount << 2) | shift_type) << 1) | shift_kind) << 4) | rm
         return True
 
 # op2imm + rn
 

miasm2.arch.arm.arch.arm_op2.encode

def encode

Definition: arch.py:947

miasm2.arch.arm.arch.arm_op2.expr

expr

Definition: arch.py:914

miasm2.arch.arm.arch.arm_op2.str_to_imm_rot_form

def str_to_imm_rot_form

Definition: arch.py:899

miasm2.arch.arm.arch.arm_op2.value

value

Definition: arch.py:955

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def miasm2.core.cpu.m_arg.fromstring	(	self,
		s,
		parser_result = `None`
	)

inherited

Definition at line 604 of file cpu.py.

 
     def fromstring(self, s, parser_result=None):
         if parser_result:
             e, start, stop = parser_result[self.parser]
             self.expr = e
             return start, stop
         try:
             v, start, stop = self.parser.scanString(s).next()
         except StopIteration:
             return None, None
         self.expr = v[0]
         return start, stop
 

miasm2.core.cpu.m_arg.expr

expr

Definition: cpu.py:607

miasm2.core.cpu.m_arg.fromstring

def fromstring

Definition: cpu.py:604

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def miasm2.arch.arm.arch.arm_op2.str_to_imm_rot_form	(	self,
		s,
		neg = `False`
	)

Definition at line 899 of file arch.py.

 
     def str_to_imm_rot_form(self, s, neg=False):
         if neg:
             s = -s & 0xffffffff
         for i in xrange(0, 32, 2):
             v = myrol32(s, i)
             if 0 <= v < 0x100:
                 return ((i / 2) << 8) | v
         return None

miasm2.arch.arm.arch.arm_op2.str_to_imm_rot_form

def str_to_imm_rot_form

Definition: arch.py:899

miasm2.core.cpu.myrol32

def myrol32

Definition: cpu.py:349

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Public Member Functions

Public Attributes

Static Public Attributes

Detailed Description

Member Function Documentation

Member Data Documentation