1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
|
from miasm2.ir.translators.translator import Translator
from miasm2.core import asmblock
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",
}
dct_rot = {'<<<': 'rot_left',
'>>>': 'rot_right',
}
def __init__(self, symbol_pool=None, **kwargs):
"""Instance a C translator
@symbol_pool: AsmSymbolPool instance
"""
super(TranslatorC, self).__init__(**kwargs)
# symbol pool
self.symbol_pool = symbol_pool
def _size2mask(self, size):
"""Return a C string corresponding to the size2mask operation, with support for
@size <= 128"""
mask = size2mask(size)
if size > 64:
# Avoid "integer constant is too large for its type" error
return "(0x%x | ((uint128_t) 0x%x << 64))" % (
mask & 0xFFFFFFFFFFFFFFFF,
(mask >> 64) & 0xFFFFFFFFFFFFFFFF,
)
return "0x%x" % mask
def from_ExprId(self, expr):
return str(expr)
def from_ExprInt(self, expr):
if expr.size == 128:
# Avoid "integer constant is too large for its type" error
return "(0x%x | ((uint128_t) 0x%x << 64))" % (
int(expr) & 0xFFFFFFFFFFFFFFFF,
(int(expr) >> 64) & 0xFFFFFFFFFFFFFFFF,
)
return "0x%x" % expr.arg.arg
def from_ExprLoc(self, expr):
loc_key = expr.loc_key
if self.symbol_pool is None:
return str(loc_key)
offset = self.symbol_pool.loc_key_to_offset(loc_key)
name = self.symbol_pool.loc_key_to_name(loc_key)
if offset is None:
return name
return "0x%x" % offset
def from_ExprAff(self, expr):
new_dst = self.from_expr(expr.dst)
new_src = self.from_expr(expr.src)
return "%s = %s" % (new_dst, new_src)
def from_ExprCond(self, expr):
new_cond = self.from_expr(expr.cond)
new_src1 = self.from_expr(expr.src1)
new_src2 = self.from_expr(expr.src2)
return "(%s?%s:%s)" % (new_cond, new_src1, new_src2)
def from_ExprMem(self, expr):
new_ptr = self.from_expr(expr.arg)
return "MEM_LOOKUP_%.2d(jitcpu, %s)" % (expr.size, new_ptr)
def from_ExprOp(self, expr):
if len(expr.args) == 1:
if expr.op == 'parity':
return "parity(%s&%s)" % (
self.from_expr(expr.args[0]),
self._size2mask(expr.args[0].size),
)
elif expr.op in ['cntleadzeros', 'cnttrailzeros']:
return "%s(0x%x, %s)" % (
expr.op,
expr.args[0].size,
self.from_expr(expr.args[0])
)
elif expr.op == '!':
return "(~ %s)&%s" % (
self.from_expr(expr.args[0]),
self._size2mask(expr.args[0].size),
)
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&%s) == (%s&%s))?1:0)' % (
self.from_expr(expr.args[0]),
self._size2mask(expr.args[0].size),
self.from_expr(expr.args[1]),
self._size2mask(expr.args[1].size),
)
elif expr.op in self.dct_shift:
return 'SHIFT_%s(%d, %s, %s)' % (
self.dct_shift[expr.op].upper(),
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&%s)' % (
self.from_expr(arg),
self._size2mask(arg.size)
)
for arg in expr.args]
oper = str(expr.op).join(oper)
return "((%s)&%s)" % (oper, self._size2mask(expr.args[0].size))
elif expr.op in ['-']:
return '(((%s&%s) %s (%s&%s))&%s)' % (
self.from_expr(expr.args[0]),
self._size2mask(expr.args[0].size),
str(expr.op),
self.from_expr(expr.args[1]),
self._size2mask(expr.args[1].size),
self._size2mask(expr.args[0].size)
)
elif expr.op in self.dct_rot:
return '(%s(%s, %s, %s) &%s)' % (
self.dct_rot[expr.op],
expr.args[0].size,
self.from_expr(expr.args[0]),
self.from_expr(expr.args[1]),
self._size2mask(expr.args[0].size),
)
elif expr.op == 'x86_cpuid':
return "%s(%s, %s)" % (expr.op,
self.from_expr(expr.args[0]),
self.from_expr(expr.args[1]))
elif (expr.op.startswith("fcom") or
expr.op in ["fadd", "fsub", "fdiv", 'fmul', "fscale",
"fprem", "fprem_lsb", "fyl2x", "fpatan"]):
return "fpu_%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(%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.is_associative(): # ?????
oper = ['(%s&%s)' % (
self.from_expr(arg),
self._size2mask(arg.size),
)
for arg in expr.args]
oper = str(expr.op).join(oper)
return "((%s)&%s)" % (
oper,
self._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) &%s)" % (
self.from_expr(expr.arg),
expr.start,
self._size2mask(expr.stop - expr.start)
)
def from_ExprCompose(self, expr):
out = []
# XXX check mask for 64 bit & 32 bit compat
if expr.size in [8, 16, 32, 64, 128]:
size = expr.size
else:
# Uncommon expression size
size = expr.size
next_power = 1
while next_power <= size:
next_power <<= 1
size = next_power
dst_cast = "uint%d_t" % size
for index, arg in expr.iter_args():
out.append("(((%s)(%s & %s)) << %d)" % (
dst_cast,
self.from_expr(arg),
self._size2mask(arg.size),
index)
)
out = ' | '.join(out)
return '(' + out + ')'
# Register the class
Translator.register(TranslatorC)
|