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from miasm2.ir.translators.translator import Translator
from miasm2.core import asmbloc
from miasm2.expression.modint import size2mask
class TranslatorC(Translator):
"Translate a Miasm expression to an equivalent C code"
# Implemented language
__LANG__ = "C"
# Operations translation
dct_shift = {'a>>': "right_arith",
'>>': "right_logic",
'<<': "left_logic",
'a<<': "left_logic",
}
dct_rot = {'<<<': 'rot_left',
'>>>': 'rot_right',
}
dct_rotc = {'<<<c_rez': 'rcl_rez_op',
'>>>c_rez': 'rcr_rez_op',
}
def from_ExprId(self, expr):
if isinstance(expr.name, asmbloc.asm_label):
return "0x%x" % expr.name.offset
return str(expr)
def from_ExprInt(self, expr):
return "0x%x" % expr.arg.arg
def from_ExprAff(self, expr):
return "%s = %s" % tuple(map(self.from_expr, (expr.dst, expr.src)))
def from_ExprCond(self, expr):
return "(%s?%s:%s)" % tuple(map(self.from_expr,
(expr.cond, expr.src1, expr.src2)))
def from_ExprMem(self, expr):
return "MEM_LOOKUP_%.2d(jitcpu, %s)" % (expr.size,
self.from_expr(expr.arg))
def from_ExprOp(self, expr):
if len(expr.args) == 1:
if expr.op == 'parity':
return "parity(%s&0x%x)" % (self.from_expr(expr.args[0]),
size2mask(expr.args[0].size))
elif expr.op in ['bsr', 'bsf']:
return "x86_%s(%s, 0x%x)" % (expr.op,
self.from_expr(expr.args[0]),
expr.args[0].size)
elif expr.op == '!':
return "(~ %s)&0x%x" % (self.from_expr(expr.args[0]),
size2mask(expr.args[0].size))
elif expr.op in ["hex2bcd", "bcd2hex"]:
return "%s_%d(%s)" % (expr.op, expr.args[0].size,
self.from_expr(expr.args[0]))
elif (expr.op.startswith("double_to_") or
expr.op.endswith("_to_double") or
expr.op.startswith("access_") or
expr.op.startswith("load_") or
expr.op.startswith("fxam_c") or
expr.op in ["-", "ftan", "frndint", "f2xm1",
"fsin", "fsqrt", "fabs", "fcos", "fchs"]):
return "%s(%s)" % (expr.op, self.from_expr(expr.args[0]))
else:
raise NotImplementedError('Unknown op: %r' % expr.op)
elif len(expr.args) == 2:
if expr.op == "==":
return '(((%s&0x%x) == (%s&0x%x))?1:0)' % (
self.from_expr(expr.args[0]), size2mask(expr.args[0].size),
self.from_expr(expr.args[1]), size2mask(expr.args[1].size))
elif expr.op in self.dct_shift:
return 'shift_%s_%.2d(%s , %s)' % (self.dct_shift[expr.op],
expr.args[0].size,
self.from_expr(expr.args[0]),
self.from_expr(expr.args[1]))
elif expr.is_associative() or expr.op in ["%", "/"]:
oper = ['(%s&0x%x)' % (self.from_expr(arg), size2mask(arg.size))
for arg in expr.args]
oper = str(expr.op).join(oper)
return "((%s)&0x%x)" % (oper, size2mask(expr.args[0].size))
elif expr.op in ['-']:
return '(((%s&0x%x) %s (%s&0x%x))&0x%x)' % (
self.from_expr(expr.args[0]), size2mask(expr.args[0].size),
str(expr.op),
self.from_expr(expr.args[1]), size2mask(expr.args[1].size),
size2mask(expr.args[0].size))
elif expr.op in self.dct_rot:
return '(%s(%s, %s, %s) &0x%x)' % (self.dct_rot[expr.op],
expr.args[0].size,
self.from_expr(expr.args[0]),
self.from_expr(expr.args[1]),
size2mask(expr.args[0].size))
elif (expr.op.startswith('cpuid') or
expr.op.startswith("fcom") or
expr.op in ["fadd", "fsub", "fdiv", 'fmul', "fscale",
"fprem", "fprem_lsb", "fyl2x", "fpatan"]):
return "%s(%s, %s)" % (expr.op, self.from_expr(expr.args[0]),
self.from_expr(expr.args[1]))
elif expr.op == "segm":
return "segm2addr(jitcpu, %s, %s)" % (
self.from_expr(expr.args[0]), self.from_expr(expr.args[1]))
elif expr.op in ['udiv', 'umod', 'idiv', 'imod']:
return '%s%d((vm_cpu_t*)jitcpu->cpu, %s, %s)' % (expr.op,
expr.args[0].size,
self.from_expr(expr.args[0]),
self.from_expr(expr.args[1]))
elif expr.op in ["bcdadd", "bcdadd_cf"]:
return "%s_%d(%s, %s)" % (expr.op, expr.args[0].size,
self.from_expr(expr.args[0]),
self.from_expr(expr.args[1]))
else:
raise NotImplementedError('Unknown op: %r' % expr.op)
elif len(expr.args) == 3 and expr.op in self.dct_rotc:
return '(%s(%s, %s, %s, %s) &0x%x)' % (self.dct_rotc[expr.op],
expr.args[0].size,
self.from_expr(expr.args[0]),
self.from_expr(expr.args[1]),
self.from_expr(expr.args[2]),
size2mask(expr.args[0].size))
elif len(expr.args) >= 3 and expr.is_associative(): # ?????
oper = ['(%s&0x%x)' % (self.from_expr(arg), size2mask(arg.size))
for arg in expr.args]
oper = str(expr.op).join(oper)
return "((%s)&0x%x)" % (oper, size2mask(expr.args[0].size))
else:
raise NotImplementedError('Unknown op: %s' % expr.op)
def from_ExprSlice(self, expr):
# XXX check mask for 64 bit & 32 bit compat
return "((%s>>%d) & 0x%X)" % (self.from_expr(expr.arg),
expr.start,
(1 << (expr.stop - expr.start)) - 1)
def from_ExprCompose(self, expr):
out = []
# XXX check mask for 64 bit & 32 bit compat
dst_cast = "uint%d_t" % expr.size
for x in expr.args:
out.append("(((%s)(%s & 0x%X)) << %d)" % (dst_cast,
self.from_expr(x[0]),
(1 << (x[2] - x[1])) - 1,
x[1]))
out = ' | '.join(out)
return '(' + out + ')'
# Register the class
Translator.register(TranslatorC)
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