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# Copyright 2015 Google Inc. All Rights Reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
from . import util
# Code for parsing the various Dalvik opcode formats
INSTRUCTION_FORMAT = util.keysToRanges({
0x00: '10x',
0x01: '12x',
0x02: '22x',
0x03: '32x',
0x04: '12x',
0x05: '22x',
0x06: '32x',
0x07: '12x',
0x08: '22x',
0x09: '32x',
0x0a: '11x',
0x0b: '11x',
0x0c: '11x',
0x0d: '11x',
0x0e: '10x',
0x0f: '11x',
0x10: '11x',
0x11: '11x',
0x12: '11n',
0x13: '21s',
0x14: '31i',
0x15: '21h',
0x16: '21s',
0x17: '31i',
0x18: '51l',
0x19: '21h',
0x1a: '21c',
0x1b: '31c',
0x1c: '21c',
0x1d: '11x',
0x1e: '11x',
0x1f: '21c',
0x20: '22c',
0x21: '12x',
0x22: '21c',
0x23: '22c',
0x24: '35c',
0x25: '3rc',
0x26: '31t',
0x27: '11x',
0x28: '10t',
0x29: '20t',
0x2a: '30t',
0x2b: '31t',
0x2c: '31t',
0x2d: '23x',
0x32: '22t',
0x38: '21t',
0x3e: '10x',
0x44: '23x',
0x52: '22c',
0x60: '21c',
0x6e: '35c',
0x73: '10x',
0x74: '3rc',
0x79: '10x',
0x7b: '12x',
0x90: '23x',
0xb0: '12x',
0xd0: '22s',
0xd8: '22b',
0xe3: '10x',
}, 256)
# parsing funcs
def p00op(w): return []
def pBAop(w): return [(w >> 8) & 0xF, w >> 12]
def pAAop(w): return [w >> 8]
def p00opAAAA(w, w2): return [w2]
def pAAopBBBB(w, w2): return [w >> 8, w2]
def pAAopCCBB(w, w2): return [w >> 8, w2 & 0xFF, w2 >> 8]
def pBAopCCCC(w, w2): return [(w >> 8) & 0xF, w >> 12, w2]
def p00opAAAAAAAA(w, w2, w3): return [w2 ^ (w3 << 16)]
def p00opAAAABBBB(w, w2, w3): return [w2, w3]
def pAAopBBBBBBBB(w, w2, w3): return [w >> 8, w2 ^ (w3 << 16)]
def pAGopBBBBFEDC(w, w2, w3):
a = w >> 12
c, d, e, f = (w3) & 0xF, (w3 >> 4) & 0xF, (w3 >> 8) & 0xF, (w3 >> 12) & 0xF
g = (w >> 8) & 0xF
return [w2, [c, d, e, f, g][:a]]
def pAAopBBBBCCCC(w, w2, w3):
a = w >> 8
return [w2, range(w3, w3+a)]
def pAAopBBBBBBBBBBBBBBBB(w, w2, w3, w4, w5):
b = w2 ^ (w3 << 16) ^ (w4 << 32) ^ (w5 << 48)
return [w >> 8, b]
_FUNC = {
'10x': p00op,
'12x': pBAop,
'11n': pBAop,
'11x': pAAop,
'10t': pAAop,
'20t': p00opAAAA,
'22x': pAAopBBBB,
'21t': pAAopBBBB,
'21s': pAAopBBBB,
'21h': pAAopBBBB,
'21c': pAAopBBBB,
'23x': pAAopCCBB,
'22b': pAAopCCBB,
'22t': pBAopCCCC,
'22s': pBAopCCCC,
'22c': pBAopCCCC,
'30t': p00opAAAAAAAA,
'32x': p00opAAAABBBB,
'31i': pAAopBBBBBBBB,
'31t': pAAopBBBBBBBB,
'31c': pAAopBBBBBBBB,
'35c': pAGopBBBBFEDC,
'3rc': pAAopBBBBCCCC,
'51l': pAAopBBBBBBBBBBBBBBBB,
}
def sign(x, bits):
if x >= (1 << (bits-1)):
x -= 1 << bits
return x
def decode(shorts, pos, opcode):
fmt = INSTRUCTION_FORMAT[opcode]
size = int(fmt[0])
results = _FUNC[fmt](*shorts[pos:pos+size])
# Check if we need to sign extend
if fmt[2] == 'n':
results[-1] = sign(results[-1], 4)
elif fmt[2] == 'b' or (fmt[2] == 't' and size == 1):
results[-1] = sign(results[-1], 8)
elif fmt[2] == 's' or (fmt[2] == 't' and size == 2):
results[-1] = sign(results[-1], 16)
elif fmt[2] == 't' and size == 3:
results[-1] = sign(results[-1], 32)
# Hats depend on actual size expected, so we rely on opcode as a hack
if fmt[2] == 'h':
assert opcode == 0x15 or opcode == 0x19
results[-1] = results[-1] << (16 if opcode == 0x15 else 48)
# Convert code offsets to actual code position
if fmt[2] == 't':
results[-1] += pos
return pos + size, results
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