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amba_sys_hardcoder.py
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amba_sys_hardcoder.py
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#!/usr/bin/env python3
# -*- coding: utf-8 -*-
""" Ambarella Firmware SYS partiton hard-coded values editor.
The tool can parse Ambarella firmware SYS partition converted to ELF.
It finds certain hard-coded values in the binary data, and allows
exporting or importing them.
Only 'setValue' element in the exported file is really changeable,
all the other data is just informational. This includes `maxValue` and
`minValue` - they don't do anything and changing them in the JSON file
will not influence update operation.
Exported values:
og_hardcoded.p3x_ambarella.*_authority_level -
Authority Level controls whether the module should respond to external
commands. Normally it is set to `1`, but if encryption keys verification
failed at startup, it is set to `0`. These parameters allow to change the
value, so that the camera continues to operate normally even if keys are
different or SHA204 chip is missing. There is no reason to keep the values
unchanged even if encryption pairing currently works fine - the changes might
become helpful in case of hardware malfunction in that area.
Here's an example AmbaShell log when there's an issue with encryption which
results in lowest Authority Level:
```
[DJI_ENCRYPT] [DjiEncryptCheckA9]check a9 mac failed
[DJI_ENCRYPT] [DjiEncryptReGetA9Status]a9's encrypt status[1] verify state[0]
```
og_hardcoded.p3x_ambarella.vid_setting_bitrates_* -
These are bitrates used when encoding videos to SD-card. There are 27 sets,
and which one is used depends on options selected in mobile app and on
model of the drone. Specifics are not known at this point.
"""
# Copyright (C) 2016,2017 Mefistotelis <[email protected]>
# Copyright (C) 2018 Original Gangsters <https://dji-rev.slack.com/>
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
from __future__ import print_function
__version__ = "0.0.3"
__author__ = "Mefistotelis @ Original Gangsters"
__license__ = "GPL"
import sys
import argparse
import os
import re
import io
import collections
import itertools
import struct
import enum
import json
from ctypes import *
try:
import capstone
from capstone import *
if not callable(getattr(capstone, "Cs", None)):
raise ImportError("The capstone library provided is incorrect - lacks Cs")
except ImportError:
print("Warning:")
print("This tool requires capstone to disassemble binary bytecode.")
raise
try:
import keystone
from keystone.keystone_const import *
if not callable(getattr(keystone, "Ks", None)):
raise ImportError("The keystone library provided is incorrect - lacks Ks")
except ImportError:
print("Warning:")
print("This tool requires keystone-engine to re-compile patched assembly.")
raise
sys.path.insert(0, '../pyelftools')
try:
from elftools.elf.elffile import ELFFile
from elftools.elf.constants import SH_FLAGS
if not callable(getattr(ELFFile, "write_changes", None)):
raise ImportError("The pyelftools library provided has no write support")
except ImportError:
print("Warning:")
print("This tool requires version of pyelftools with ELF write support.")
print("Try `arm_bin2elf.py` for details.")
raise
def eprint(*args, **kwargs):
print(*args, file=sys.stderr, **kwargs)
class VarType(enum.Enum):
# Variable points to code line from asm regular expression
DIRECT_LINE_OF_CODE = enum.auto()
# Variable contains directly entered integer value
DIRECT_INT_VALUE = enum.auto()
# Variable represents assembler operand
DIRECT_OPERAND = enum.auto()
# Variable contains absolute address to a code chunk or function
ABSOLUTE_ADDR_TO_CODE = enum.auto()
# Variable contains absolute address to a global variable
ABSOLUTE_ADDR_TO_GLOBAL_DATA = enum.auto()
# Variable contains address to a code chunk relative to some base address
RELATIVE_ADDR_TO_CODE = enum.auto()
# Variable contains relative address to a global variable which contains absolute address to the code chunk
RELATIVE_ADDR_TO_PTR_TO_CODE = enum.auto()
# Variable contains address to a global variable relative to some base address
RELATIVE_ADDR_TO_GLOBAL_DATA = enum.auto()
# Variable contains relative address to a global variable which contains absolute address to the real value
RELATIVE_ADDR_TO_PTR_TO_GLOBAL_DATA = enum.auto()
# Variable contains offset in unknown relation to some address, ie field position within a struct; obsolete - use the above instead
RELATIVE_OFFSET = enum.auto()
# Variable contains data not directly bound to any input offset
DETACHED_DATA = enum.auto()
# Variable which value is unused in current variant of the code
UNUSED_DATA = enum.auto()
# Internal variable of the tool, not to be used in pattern definitions
INTERNAL_DATA = enum.auto()
class DataVariety(enum.Enum):
UNKNOWN = enum.auto()
CHAR = enum.auto()
UINT8_T = enum.auto()
UINT16_T = enum.auto()
UINT32_T = enum.auto()
UINT64_T = enum.auto()
INT8_T = enum.auto()
INT16_T = enum.auto()
INT32_T = enum.auto()
INT64_T = enum.auto()
FLOAT = enum.auto()
DOUBLE = enum.auto()
STRUCT = enum.auto()
class CodeVariety(enum.Enum):
# Just a chunk of code, not a function start
CHUNK = enum.auto()
# The pointed place is a function start
FUNCTION = enum.auto()
class DummyStruct(LittleEndianStructure):
_pack_ = 1
_fields_ = [('unk', c_uint8)]
# List of architectures
# based on ropstone by blasty
elf_archs = [
{
'name' : "arm",
'cs_const' : CS_ARCH_ARM,
'ks_const' : KS_ARCH_ARM,
'boundary' : 4,
'modes' : [
{
'name' : "arm",
'desc' : "ARMv7 processor mode",
'cs_const' : CS_MODE_ARM,
'ks_const' : KS_MODE_ARM,
},
{
'name' : "armv8",
'desc' : "ARMv8 processor mode",
'cs_const' : CS_MODE_V8,
'ks_const' : KS_MODE_V8,
},
{
'name' : "thumb",
'desc' : "THUMB processor mode",
'cs_const' : CS_MODE_THUMB,
'ks_const' : KS_MODE_THUMB,
# this overrides the boundary of the parent architecture
'boundary' : 2,
# this adds a shift offset to the output addr to force THUMB mode
'retshift' : 1,
},
{
'name' : "le",
'desc' : "Little endian",
'byteorder': "little",
'cs_const' : CS_MODE_LITTLE_ENDIAN,
'ks_const' : KS_MODE_LITTLE_ENDIAN,
},
{
'name' : "be",
'desc' : "Big endian",
'byteorder': "big",
'cs_const' : CS_MODE_BIG_ENDIAN,
'ks_const' : KS_MODE_BIG_ENDIAN,
},
]
},
{
'name' : "arm64",
'cs_const' : CS_ARCH_ARM64,
'ks_const' : KS_ARCH_ARM64,
'boundary' : 4,
'modes' : [
{
'name' : "le",
'desc' : "Little Endian",
'byteorder': "little",
'cs_const' : CS_MODE_LITTLE_ENDIAN,
'ks_const' : KS_MODE_LITTLE_ENDIAN,
},
]
},
{
'name' : "mips",
'cs_const' : CS_ARCH_MIPS,
'ks_const' : KS_ARCH_MIPS,
'boundary' : 4,
'modes' : [
{
'name' : "32b",
'desc' : "MIPS32",
'cs_const' : CS_MODE_MIPS32,
'ks_const' : KS_MODE_MIPS32,
},
{
'name' : "64b",
'desc' : "MIPS64",
'cs_const' : CS_MODE_MIPS64,
'ks_const' : KS_MODE_MIPS64,
},
{
'name' : "le",
'desc' : "Little endian",
'byteorder': "little",
'cs_const' : CS_MODE_LITTLE_ENDIAN,
'ks_const' : KS_MODE_LITTLE_ENDIAN,
},
{
'name' : "be",
'desc' : "Big endian",
'byteorder': "big",
'cs_const' : CS_MODE_BIG_ENDIAN,
'ks_const' : KS_MODE_BIG_ENDIAN,
},
]
},
{
'name' : "x86",
'cs_const' : CS_ARCH_X86,
'ks_const' : KS_ARCH_X86,
'boundary' : 1,
'modes' : [
{
'name' : "32b",
'desc' : "x86 32bit",
'byteorder': "little",
'cs_const' : CS_MODE_32,
'ks_const' : KS_MODE_32,
},
{
'name' : "64b",
'desc' : "x86_64 64bit",
'byteorder': "little",
'cs_const' : CS_MODE_64,
'ks_const' : KS_MODE_64,
},
]
}
]
# Function with address to _msg_author_level
re_func_DjiMsgAuthorLevelGet = {
'name': "DjiMsgAuthorLevelGet",
'version': "P3X_FW_V01.01",
're': """
DjiMsgAuthorLevelGet:
ldr r0, \[pc, #(?P<msg_author_level>[0-9a-fx]+)\]
ldr r0, \[r0\]
bx lr
""",
'vars': {
'DjiMsgAuthorLevelGet': {'type': VarType.DIRECT_LINE_OF_CODE, 'variety': CodeVariety.FUNCTION},
'msg_author_level': {'type': VarType.RELATIVE_ADDR_TO_PTR_TO_GLOBAL_DATA, 'baseaddr': "PC+", 'variety': DataVariety.UINT32_T},
},
}
re_func_DjiMsgSettingsInit = {
'name': "DjiMsgSettingsInit",
'version': "P3X_FW_V01.01",
're': """
DjiMsgSettingsInit:
push {r4, r5, lr}
sub sp, sp, #0x14
mov r4, #0
mov r1, #0
strb r1, \[sp, #0x11\]
mov r1, #0
strb r1, \[sp, #0x10\]
mov r5, #0
ldr r0, \[pc, #(?P<dji_msg_mutex>[0-9a-fx]+)\]
bl #(?P<AmbaKAL_MutexCreate>[0-9a-fx]+)
movs r4, r0
cmp r4, #0
beq #(?P<loc_label02>[0-9a-fx]+)
ldr r0, \[pc, #(?P<printk_log_level>[0-9a-fx]+)\]
ldr r0, \[r0\]
cmp r0, #0
bmi #(?P<loc_label03>[0-9a-fx]+)
mov r5, #0
mov r0, #1
movs r5, r0
bl #(?P<AmbaPrintk_Disabled>[0-9a-fx]+)
cmp r0, #1
beq #(?P<loc_label03>[0-9a-fx]+)
ldr r0, \[pc, #(?P<cstr_func_name>[0-9a-fx]+)\]
str r0, \[sp, #0xc\]
ldr r0, \[pc, #(?P<cstr_fmt_text1>[0-9a-fx]+)\]
str r0, \[sp, #8\]
str r5, \[sp, #4\]
mov r0, #0
str r0, \[sp\]
mov r3, #0
mov r2, #1
mov r1, #1
mov r0, #1
bl #(?P<AmbaPrintk>[0-9a-fx]+)
loc_label03:
movs r0, r4
b #(?P<loc_label06>[0-9a-fx]+)
loc_label02:
mov r0, #0
bl #(?P<DjiMsgAuthorLevelSet>[0-9a-fx]+)
movs r4, r0
add r1, sp, #0x10
add r0, sp, #0x11
bl #(?P<DjiEncryptGetA9Status>[0-9a-fx]+)
cmp r0, #0
beq #(?P<loc_label09>[0-9a-fx]+)
mov r0, #(?P<encrypt_query_fail_authority_level>[0-9a-fx]+)
bl #(?P<DjiMsgAuthorLevelSet>[0-9a-fx]+)
loc_label09:
ldrb r0, \[sp, #0x11\]
cmp r0, #1
bne #(?P<loc_label10>[0-9a-fx]+)
ldrb r0, \[sp, #0x10\]
cmp r0, #1
bne #(?P<loc_label10>[0-9a-fx]+)
mov r0, #(?P<verify_state_good_authority_level>[0-9a-fx]+)
bl #(?P<DjiMsgAuthorLevelSet>[0-9a-fx]+)
b #(?P<loc_label11>[0-9a-fx]+)
loc_label10:
mov r0, #(?P<verify_state_bad_authority_level>[0-9a-fx]+)
bl #(?P<DjiMsgAuthorLevelSet>[0-9a-fx]+)
loc_label11:
mov r5, #0
b #(?P<loc_label12>[0-9a-fx]+)
loc_label13:
ldr r0, \[pc, #(?P<unk_var01>[0-9a-fx]+)\]
lsls r1, r5, #2
ldr r2, \[pc, #(?P<unk_var02>[0-9a-fx]+)\]
adds r1, r1, r2
mov r2, #1
str r2, \[r0, r1\]
adds r5, r5, #1
loc_label12:
cmp r5, #4
blo #(?P<loc_label13>[0-9a-fx]+)
ldr r0, \[pc, #(?P<unk_var03>[0-9a-fx]+)\]
mov r1, #0
str r1, \[r0\]
ldr r0, \[pc, #(?P<unk_var04>[0-9a-fx]+)\]
mov r1, #1
str r1, \[r0\]
ldr r0, \[pc, #(?P<msg_adjust_task_finished>[0-9a-fx]+)\]
mov r1, #0
str r1, \[r0\]
ldr r0, \[pc, #(?P<unk_var05>[0-9a-fx]+)\]
mov r1, #0
str r1, \[r0\]
mov r2, #0x90
mov r1, #0
ldr r0, \[pc, #(?P<unk_var06>[0-9a-fx]+)\]
bl #(?P<memset_0>[0-9a-fx]+)
mov r2, #0x38
mov r1, #0
ldr r0, \[pc, #(?P<unk_var07>[0-9a-fx]+)\]
bl #(?P<memset_0>[0-9a-fx]+)
mov r2, #0xc
mov r1, #0
ldr r0, \[pc, #(?P<unk_var08>[0-9a-fx]+)\]
bl #(?P<memset_0>[0-9a-fx]+)
mov r2, #8
mov r1, #0
ldr r0, \[pc, #(?P<unk_var09>[0-9a-fx]+)\]
bl #(?P<memset_0>[0-9a-fx]+)
ldr r0, \[pc, #(?P<dji_msg_mutex>[0-9a-fx]+)\]
ldr r1, \[pc, #(?P<unk_var10>[0-9a-fx]+)\]
str r1, \[r0, #(?P<unk_offs01>[0-9a-fx]+)\]
movw r2, #0x1010
mov r1, #0
ldr r0, \[pc, #(?P<unk_var11>[0-9a-fx]+)\]
bl #(?P<memset_0>[0-9a-fx]+)
mov r2, #8
mov r1, #0
ldr r0, \[pc, #(?P<unk_var12>[0-9a-fx]+)\]
bl #(?P<memset_0>[0-9a-fx]+)
mov r2, #0xc
mov r1, #0
ldr r0, \[pc, #(?P<unk_var13>[0-9a-fx]+)\]
bl #(?P<memset_0>[0-9a-fx]+)
mov r2, #8
mov r1, #0
ldr r0, \[pc, #(?P<unk_var14>[0-9a-fx]+)\]
bl #(?P<memset_0>[0-9a-fx]+)
mov r2, #0x16
mov r1, #0
ldr r0, \[pc, #(?P<unk_var15>[0-9a-fx]+)\]
bl #(?P<memset_0>[0-9a-fx]+)
ldr r0, \[pc, #(?P<unk_var16>[0-9a-fx]+)\]
mov r1, #0
strb r1, \[r0\]
mov r2, #0x36
mov r1, #0
ldr r0, \[pc, #(?P<unk_var17>[0-9a-fx]+)\]
bl #(?P<memset_0>[0-9a-fx]+)
ldr r0, \[pc, #(?P<unk_var18>[0-9a-fx]+)\]
mov r1, #1
str r1, \[r0\]
mov r2, #0xc
mov r1, #0
ldr r0, \[pc, #(?P<unk_var19>[0-9a-fx]+)\]
bl #(?P<memset_0>[0-9a-fx]+)
mov r2, #4
mov r1, #0
ldr r0, \[pc, #(?P<unk_var20>[0-9a-fx]+)\]
bl #(?P<memset_0>[0-9a-fx]+)
mov r0, #0
loc_label06:
add sp, sp, #0x14
pop {r4, r5, pc}
""",
'vars': {
'DjiMsgSettingsInit': {'type': VarType.DIRECT_LINE_OF_CODE, 'variety': CodeVariety.FUNCTION},
'AmbaKAL_MutexCreate': {'type': VarType.ABSOLUTE_ADDR_TO_CODE, 'variety': CodeVariety.FUNCTION},
'AmbaPrintk_Disabled': {'type': VarType.ABSOLUTE_ADDR_TO_CODE, 'variety': CodeVariety.FUNCTION},
'AmbaPrintk': {'type': VarType.ABSOLUTE_ADDR_TO_CODE, 'variety': CodeVariety.FUNCTION},
'DjiMsgAuthorLevelSet': {'type': VarType.ABSOLUTE_ADDR_TO_CODE, 'variety': CodeVariety.FUNCTION},
'DjiEncryptGetA9Status': {'type': VarType.ABSOLUTE_ADDR_TO_CODE, 'variety': CodeVariety.FUNCTION},
'memset_0': {'type': VarType.ABSOLUTE_ADDR_TO_CODE, 'variety': CodeVariety.FUNCTION},
'cstr_fmt_text1': {'type': VarType.RELATIVE_ADDR_TO_PTR_TO_GLOBAL_DATA, 'baseaddr': "PC+", 'variety': DataVariety.CHAR, 'array': "null_term"},
'cstr_func_name': {'type': VarType.RELATIVE_ADDR_TO_PTR_TO_GLOBAL_DATA, 'baseaddr': "PC+", 'variety': DataVariety.CHAR, 'array': "null_term"},
'dji_msg_mutex': {'type': VarType.RELATIVE_ADDR_TO_PTR_TO_GLOBAL_DATA, 'baseaddr': "PC+", 'variety': DataVariety.STRUCT, 'struct': DummyStruct,},
'msg_adjust_task_finished': {'type': VarType.RELATIVE_ADDR_TO_PTR_TO_GLOBAL_DATA, 'baseaddr': "PC+", 'variety': DataVariety.UINT32_T},
'printk_log_level': {'type': VarType.RELATIVE_ADDR_TO_PTR_TO_GLOBAL_DATA, 'baseaddr': "PC+", 'variety': DataVariety.UINT32_T},
'encrypt_query_fail_authority_level': {'type': VarType.DIRECT_INT_VALUE, 'variety': DataVariety.INT32_T,
'public': "og_hardcoded.p3x_ambarella", 'minValue': "0", 'maxValue': "2", 'defaultValue': "0",
'description': "AuthorityLevel established when SHA204 communication fail; 0-restricted,1-normal,2-superuser"},
'verify_state_good_authority_level': {'type': VarType.DIRECT_INT_VALUE, 'variety': DataVariety.INT32_T,
'public': "og_hardcoded.p3x_ambarella", 'minValue': "0", 'maxValue': "2", 'defaultValue': "1",
'description': "AuthorityLevel established when encryption keys match; 0-restricted,1-normal,2-superuser"},
'verify_state_bad_authority_level': {'type': VarType.DIRECT_INT_VALUE, 'variety': DataVariety.INT32_T,
'public': "og_hardcoded.p3x_ambarella", 'minValue': "0", 'maxValue': "2", 'defaultValue': "0",
'description': "AuthorityLevel established on encryption mismatch; 0-restricted,1-normal,2-superuser"},
'loc_label02': {'type': VarType.ABSOLUTE_ADDR_TO_CODE, 'variety': CodeVariety.CHUNK},
'loc_label03': {'type': VarType.ABSOLUTE_ADDR_TO_CODE, 'variety': CodeVariety.CHUNK},
'loc_label06': {'type': VarType.ABSOLUTE_ADDR_TO_CODE, 'variety': CodeVariety.CHUNK},
'loc_label09': {'type': VarType.ABSOLUTE_ADDR_TO_CODE, 'variety': CodeVariety.CHUNK},
'loc_label10': {'type': VarType.ABSOLUTE_ADDR_TO_CODE, 'variety': CodeVariety.CHUNK},
'loc_label11': {'type': VarType.ABSOLUTE_ADDR_TO_CODE, 'variety': CodeVariety.CHUNK},
'loc_label12': {'type': VarType.ABSOLUTE_ADDR_TO_CODE, 'variety': CodeVariety.CHUNK},
'loc_label13': {'type': VarType.ABSOLUTE_ADDR_TO_CODE, 'variety': CodeVariety.CHUNK},
'unk_offs01': {'type': VarType.DIRECT_INT_VALUE, 'variety': DataVariety.UINT32_T},
'unk_var01': {'type': VarType.RELATIVE_ADDR_TO_GLOBAL_DATA, 'baseaddr': "PC+", 'variety': DataVariety.UNKNOWN},
'unk_var02': {'type': VarType.RELATIVE_ADDR_TO_GLOBAL_DATA, 'baseaddr': "PC+", 'variety': DataVariety.UNKNOWN},
'unk_var03': {'type': VarType.RELATIVE_ADDR_TO_GLOBAL_DATA, 'baseaddr': "PC+", 'variety': DataVariety.UNKNOWN},
'unk_var04': {'type': VarType.RELATIVE_ADDR_TO_GLOBAL_DATA, 'baseaddr': "PC+", 'variety': DataVariety.UNKNOWN},
'unk_var05': {'type': VarType.RELATIVE_ADDR_TO_GLOBAL_DATA, 'baseaddr': "PC+", 'variety': DataVariety.UNKNOWN},
'unk_var06': {'type': VarType.RELATIVE_ADDR_TO_GLOBAL_DATA, 'baseaddr': "PC+", 'variety': DataVariety.UNKNOWN},
'unk_var07': {'type': VarType.RELATIVE_ADDR_TO_GLOBAL_DATA, 'baseaddr': "PC+", 'variety': DataVariety.UNKNOWN},
'unk_var08': {'type': VarType.RELATIVE_ADDR_TO_GLOBAL_DATA, 'baseaddr': "PC+", 'variety': DataVariety.UNKNOWN},
'unk_var09': {'type': VarType.RELATIVE_ADDR_TO_GLOBAL_DATA, 'baseaddr': "PC+", 'variety': DataVariety.UNKNOWN},
'unk_var10': {'type': VarType.RELATIVE_ADDR_TO_GLOBAL_DATA, 'baseaddr': "PC+", 'variety': DataVariety.UNKNOWN},
'unk_var11': {'type': VarType.RELATIVE_ADDR_TO_GLOBAL_DATA, 'baseaddr': "PC+", 'variety': DataVariety.UNKNOWN},
'unk_var12': {'type': VarType.RELATIVE_ADDR_TO_GLOBAL_DATA, 'baseaddr': "PC+", 'variety': DataVariety.UNKNOWN},
'unk_var13': {'type': VarType.RELATIVE_ADDR_TO_GLOBAL_DATA, 'baseaddr': "PC+", 'variety': DataVariety.UNKNOWN},
'unk_var14': {'type': VarType.RELATIVE_ADDR_TO_GLOBAL_DATA, 'baseaddr': "PC+", 'variety': DataVariety.UNKNOWN},
'unk_var15': {'type': VarType.RELATIVE_ADDR_TO_GLOBAL_DATA, 'baseaddr': "PC+", 'variety': DataVariety.UNKNOWN},
'unk_var16': {'type': VarType.RELATIVE_ADDR_TO_GLOBAL_DATA, 'baseaddr': "PC+", 'variety': DataVariety.UNKNOWN},
'unk_var17': {'type': VarType.RELATIVE_ADDR_TO_GLOBAL_DATA, 'baseaddr': "PC+", 'variety': DataVariety.UNKNOWN},
'unk_var18': {'type': VarType.RELATIVE_ADDR_TO_GLOBAL_DATA, 'baseaddr': "PC+", 'variety': DataVariety.UNKNOWN},
'unk_var19': {'type': VarType.RELATIVE_ADDR_TO_GLOBAL_DATA, 'baseaddr': "PC+", 'variety': DataVariety.UNKNOWN},
'unk_var20': {'type': VarType.RELATIVE_ADDR_TO_GLOBAL_DATA, 'baseaddr': "PC+", 'variety': DataVariety.UNKNOWN},
},
}
class AmbaP3XBitrateTableEntry(LittleEndianStructure):
_pack_ = 1
_fields_ = [('min', c_int),
('avg', c_int),
('max', c_int)]
re_func_DjiUstVideoQualitySetInner = {
'name': "DjiUstVideoQualitySetInner",
'version': "P3X_FW_V01.01",
're': """
DjiUstVideoQualitySetInner:
push {r4, r5, lr}
sub sp, sp, #0x14
movs r4, r0
ldr r0, \[r4\]
cmp r0, #0
beq #(?P<loc_label01>[0-9a-fx]+)
cmp r0, #2
beq #(?P<loc_label02>[0-9a-fx]+)
blo #(?P<loc_label03>[0-9a-fx]+)
b #(?P<loc_label04>[0-9a-fx]+)
loc_label01:
add r0, r2, r2, lsl #1
ldr r1, \[pc, #(?P<vid_setting_bitrates>[0-9a-fx]+)\]
ldr r0, \[r1, r0, lsl #2\]
loc_label06:
cmp r0, #0
beq #(?P<loc_label05>[0-9a-fx]+)
ldr r1, \[pc, #(?P<unk_var01>[0-9a-fx]+)\]
ldrsb r1, \[r1, #0x12\]
mov r2, #0x54
ldr r3, \[pc, #(?P<vid_settings_ust>[0-9a-fx]+)\]
smlabb r1, r1, r2, r3
str r0, \[r1, #8\]
loc_label05:
mov r0, #0
loc_label08:
add sp, sp, #0x14
pop {r4, r5, pc}
loc_label03:
add r0, r2, r2, lsl #1
ldr r1, \[pc, #(?P<vid_setting_bitrates>[0-9a-fx]+)\]
adds r0, r1, r0, lsl #2
ldr r0, \[r0, #4\]
b #(?P<loc_label06>[0-9a-fx]+)
loc_label02:
add r0, r2, r2, lsl #1
ldr r1, \[pc, #(?P<vid_setting_bitrates>[0-9a-fx]+)\]
adds r0, r1, r0, lsl #2
ldr r0, \[r0, #8\]
b #(?P<loc_label06>[0-9a-fx]+)
loc_label04:
ldr r0, \[pc, #(?P<printk_log_level>[0-9a-fx]+)\]
ldr r0, \[r0\]
cmp r0, #0
bmi #(?P<loc_label07>[0-9a-fx]+)
mov r5, #0
mov r0, #1
movs r5, r0
bl #(?P<AmbaPrintk_Disabled>[0-9a-fx]+)
cmp r0, #1
beq #(?P<loc_label07>[0-9a-fx]+)
ldr r0, \[r4\]
str r0, \[sp, #0x10\]
ldr r0, \[pc, #(?P<cstr_func_name>[0-9a-fx]+)\]
str r0, \[sp, #0xc\]
ldr r0, \[pc, #(?P<cstr_fmt_text1>[0-9a-fx]+)\]
str r0, \[sp, #8\]
str r5, \[sp, #4\]
mov r0, #0
str r0, \[sp\]
mov r3, #0
mov r2, #1
mov r1, #1
mov r0, #1
bl #(?P<AmbaPrintk>[0-9a-fx]+)
loc_label07:
mvn r0, #0
b #(?P<loc_label08>[0-9a-fx]+)
""",
'vars': {
'DjiUstVideoQualitySetInner': {'type': VarType.DIRECT_LINE_OF_CODE, 'variety': CodeVariety.FUNCTION},
'cstr_fmt_text1': {'type': VarType.RELATIVE_ADDR_TO_PTR_TO_GLOBAL_DATA, 'baseaddr': "PC+", 'variety': DataVariety.CHAR, 'array': "null_term"},
'cstr_func_name': {'type': VarType.RELATIVE_ADDR_TO_PTR_TO_GLOBAL_DATA, 'baseaddr': "PC+", 'variety': DataVariety.CHAR, 'array': "null_term"},
'AmbaPrintk_Disabled': {'type': VarType.ABSOLUTE_ADDR_TO_CODE, 'variety': CodeVariety.FUNCTION},
'AmbaPrintk': {'type': VarType.ABSOLUTE_ADDR_TO_CODE, 'variety': CodeVariety.FUNCTION},
'loc_label01': {'type': VarType.ABSOLUTE_ADDR_TO_CODE, 'variety': CodeVariety.CHUNK},
'loc_label02': {'type': VarType.ABSOLUTE_ADDR_TO_CODE, 'variety': CodeVariety.CHUNK},
'loc_label03': {'type': VarType.ABSOLUTE_ADDR_TO_CODE, 'variety': CodeVariety.CHUNK},
'loc_label04': {'type': VarType.ABSOLUTE_ADDR_TO_CODE, 'variety': CodeVariety.CHUNK},
'loc_label05': {'type': VarType.ABSOLUTE_ADDR_TO_CODE, 'variety': CodeVariety.CHUNK},
'loc_label06': {'type': VarType.ABSOLUTE_ADDR_TO_CODE, 'variety': CodeVariety.CHUNK},
'loc_label07': {'type': VarType.ABSOLUTE_ADDR_TO_CODE, 'variety': CodeVariety.CHUNK},
'loc_label08': {'type': VarType.ABSOLUTE_ADDR_TO_CODE, 'variety': CodeVariety.CHUNK},
'unk_var01': {'type': VarType.RELATIVE_ADDR_TO_GLOBAL_DATA, 'baseaddr': "PC+", 'variety': DataVariety.UNKNOWN},
'vid_settings_ust': {'type': VarType.RELATIVE_ADDR_TO_PTR_TO_GLOBAL_DATA, 'baseaddr': "PC+", 'variety': DataVariety.STRUCT, 'struct': DummyStruct,},
'vid_setting_bitrates': {'type': VarType.RELATIVE_ADDR_TO_PTR_TO_GLOBAL_DATA, 'baseaddr': "PC+", 'variety': DataVariety.STRUCT, 'array': 27,
'struct': AmbaP3XBitrateTableEntry,
'public': "og_hardcoded.p3x_ambarella", 'minValue': "1000000 1000000 1000000", 'maxValue': "64000000 64000000 64000000",
'description': "Bitrates used for h.264 video compression; 3 values: min, avg, max"},
'printk_log_level': {'type': VarType.RELATIVE_ADDR_TO_PTR_TO_GLOBAL_DATA, 'baseaddr': "PC+", 'variety': DataVariety.UINT32_T},
},
}
re_general_list = [
{'sect': ".text", 'func': re_func_DjiMsgSettingsInit,},
{'sect': ".text", 'func': re_func_DjiUstVideoQualitySetInner,},
]
def get_asm_arch_by_name(arname):
for arch in elf_archs:
if arch['name'] == arname:
return arch
return None
def get_asm_mode_by_name(arch, mdname):
for mode in arch['modes']:
if mode['name'] == mdname:
return mode
return None
def elf_march_to_asm_config(elfobj, submode=None):
""" Retrieves machine architecture for given elf.
Returns config for capstone and keystone.
"""
march = elfobj.get_machine_arch()
asm_arch = None
asm_modes = []
if march == "x64":
asm_arch = get_asm_arch_by_name("x86")
asm_modes.append( get_asm_mode_by_name(asm_arch, "64b") )
elif march == "x86":
asm_arch = get_asm_arch_by_name("x86")
asm_modes.append( get_asm_mode_by_name(asm_arch, "32b") )
elif march == "ARM":
asm_arch = get_asm_arch_by_name("arm")
if elfobj.little_endian:
asm_modes.append( get_asm_mode_by_name(asm_arch, "le") )
else:
asm_modes.append( get_asm_mode_by_name(asm_arch, "be") )
elif march == "MIPS":
asm_arch = get_asm_arch_by_name("mips")
asm_modes.append( get_asm_mode_by_name(asm_arch, "32b") )
if elfobj.little_endian:
asm_modes.append( get_asm_mode_by_name(asm_arch, "le") )
else:
asm_modes.append( get_asm_mode_by_name(asm_arch, "be") )
if submode != None:
asm_modes.append( get_asm_mode_by_name(asm_arch, submode) )
return (asm_arch, asm_modes)
def get_arm_vma_relative_to_pc_register(asm_arch, section, address, size, offset_str):
""" Gets Virtual Memory Address associated with offet given within an asm instruction.
ARMs have a way of storing relative offsets which may be confusing at first.
"""
alignment = asm_arch['boundary']
# In ARM THUMB mode, alignment is 4
if (asm_arch['name'] == "arm") and (alignment == 2):
alignment = 4
if isinstance(offset_str, int):
offset_int = offset_str
else:
offset_int = int(offset_str, 0)
address = address - (address % alignment)
vma = address + size + asm_arch['boundary'] + offset_int
return vma - (vma % alignment)
def get_arm_vma_subtracted_from_pc_register(asm_arch, section, address, size, offset_str):
""" Gets Virtual Memory Address associated to offet subtracted from PC reg within an asm instruction.
"""
alignment = asm_arch['boundary']
# In ARM THUMB mode, alignment is 4
if (asm_arch['name'] == "arm") and (alignment == 2):
alignment = 4
if isinstance(offset_str, int):
offset_int = offset_str
else:
offset_int = int(offset_str, 0)
address = address - (address % alignment)
vma = address + size - offset_int
return vma - (vma % asm_arch['boundary'])
def get_arm_offset_val_relative_to_pc_register(asm_arch, address, size, vma):
""" Gets offset associated with Virtual Memory Address given to place into asm instruction.
"""
offset_val = vma - address - size - asm_arch['boundary']
return offset_val
def get_section_and_offset_from_address(asm_arch, elf_sections, address):
""" Gets Virtual Memory Address associated with offet given within an asm instruction.
"""
for sect_name, sect in elf_sections.items():
offset = address - sect['addr']
if (offset >= 0) and (offset < len(sect['data'])):
return sect_name, offset
return None, None
def armfw_elf_generic_objdump(po, elffh, asm_submode=None):
""" Dump executable in similar manner to objdump disassemble function.
"""
elfobj = ELFFile(elffh)
asm_arch, asm_modes = elf_march_to_asm_config(elfobj, asm_submode)
if len(asm_modes) < 1 or not isinstance(asm_modes[0], collections.abc.Mapping):
raise ValueError("ELF has unsupported machine type ({:s}).".format(elfobj['e_machine']))
cs_mode = 0
retshift = 0
for mode in asm_modes:
cs_mode = cs_mode | mode['cs_const']
# check for mode specific overrides (only needed for THUMB atm)
if 'boundary' in mode:
asm_arch['boundary'] = mode['boundary']
if 'retshift' in mode:
retshift = mode['retshift']
cs = capstone.Cs(asm_arch['cs_const'], cs_mode)
# Get sections dictionary, so that we can easily access them by name
elf_sections = {}
for i in range(elfobj.num_sections()):
esection = elfobj.get_section(i)
if esection['sh_type'] != "SHT_PROGBITS":
continue
if not (esection['sh_flags'] & SH_FLAGS.SHF_ALLOC):
continue
if (po.verbose > 2):
print("{:s}: Found section {:s}".format(po.elffile,esection.name))
section = {
'index' : i,
'name' : esection.name,
'addr' : esection['sh_addr'],
'data' : esection.data(),
}
if (esection['sh_flags'] & SH_FLAGS.SHF_EXECINSTR):
sect_offs = 0
while sect_offs < len(section['data']):
for (address, size, mnemonic, op_str) in cs.disasm_lite(section['data'][sect_offs:], section['addr']+sect_offs):
print("0x{:05x}:\t{:s}\t{:s}".format(address, mnemonic, op_str))
sect_offs += size
size = len(section['data']) - sect_offs
if size > asm_arch['boundary']:
size = asm_arch['boundary']
address = section['addr']+sect_offs
if size > 0:
print("0x{:05x}:\tdcb\t".format(address), end='')
for bt in section['data'][sect_offs:sect_offs+size]:
print("0x{:02x} ".format(bt), end='')
print("")
sect_offs += size
else:
sect_offs = 0
while sect_offs < len(section['data']):
size = len(section['data']) - sect_offs
if size > 4:
size = 4
address = section['addr']+sect_offs
if size > 0:
print("0x{:05x}:\tdcb\t".format(address), end='')
for bt in section['data'][sect_offs:sect_offs+size]:
print("0x{:02x} ".format(bt), end='')
print("")
sect_offs += size
def armfw_asm_search_strings_to_re_list(re_patterns):
""" Converts multiline regex string to a list of patterns.
"""
# Divide to lines
re_lines = re_patterns.split(sep="\n")
re_labels = {}
# Remove comments
re_lines = [s.split(";",1)[0] if ";" in s else s for s in re_lines]
# Remove labels
for i, s in enumerate(re_lines):
re_label = re.search(r'^([a-zA-Z0-9_]+):(.*)$', s)
if re_label is not None:
re_lines[i] = re_label.group(2)
re_labels[re_label.group(1)] = i
# Strip whitespaces
re_lines = list(map(str.strip, re_lines))
# Later empty lines will be removed; update re_labels accordingly
reduced_line = 0
for s in re_lines:
if s == "":
for lab_name, lab_line in re_labels.items():
if (lab_line > reduced_line):
re_labels[lab_name] = lab_line - 1
else:
reduced_line += 1
# Remove empty lines
return list(filter(None, re_lines)), re_labels
def armfw_elf_section_search_init(asm_arch, section, patterns):
""" Initialize search data.
"""
search = {}
search['asm_arch'] = asm_arch
search['section'] = section
search['name'] = patterns['name']
search['version'] = patterns['version']
re_lines, re_labels = armfw_asm_search_strings_to_re_list(patterns['re'])
search['re'] = re_lines
search['var_defs'] = patterns['vars'].copy()
for lab_name, lab_line in re_labels.items():
if lab_name in search['var_defs']:
var_def = search['var_defs'][lab_name]
var_def['line'] = lab_line
search['var_vals'] = {}
# Starting address of the current match
search['match_address'] = 0
# Binary size of each matched regex line
search['re_size'] = []
# Amount of lines already matched (aka current line)
search['match_lines'] = 0
search['best_match_address'] = 0
search['best_match_lines'] = 0
# List of datasets for full matches
search['full_matches'] = []
# Variant of the current variable length statement
search['varlen_inc'] = 0
# List of points where variable length lines were found
search['varlen_points'] = []
return search
def armfw_elf_section_search_reset(search):
""" Reset search data after matching failed.
"""
if search['best_match_lines'] < search['match_lines']:
search['best_match_address'] = search['match_address']
search['best_match_lines'] = search['match_lines']
search['var_vals'] = {}
search['match_address'] = 0
search['re_size'] = []
search['match_lines'] = 0
search['varlen_inc'] = 0
search['varlen_points'] = []
return search
def armfw_elf_section_search_varlen_point_mark(search, address, varlen_delta):
""" Add or update variable length point in given search results.
"""
# the search['match_address'], might be unset if we are matching first line;
# in that case, use address from func parameter
if search['match_lines'] < 1:
search['match_address'] = address
# do not change search['varlen_inc'], only the one which will be used
# if matching current one will fail
for varlen in search['varlen_points']:
if varlen['match_address'] != search['match_address']:
continue
if varlen['match_lines'] != search['match_lines']:
continue
if sum(varlen['re_size']) != sum(search['re_size']):
continue
# found pre-existing varlen point
varlen['varlen_delta'] = varlen_delta
if varlen_delta > 0:
varlen['varlen_inc'] += 1
return search
varlen = {}
varlen['var_vals'] = search['var_vals'].copy()
varlen['match_address'] = search['match_address'] # int value
varlen['re_size'] = search['re_size'].copy()
varlen['match_lines'] = search['match_lines'] # int value
varlen['varlen_inc'] = 1 # 0 is already being tested when this is added
varlen['varlen_delta'] = varlen_delta
search['varlen_points'].append(varlen)
return search
def armfw_elf_section_search_varlen_point_rewind(search):
""" Rewinds the search to last varlen entry which may be increased.
"""
if search['best_match_lines'] < search['match_lines']:
search['best_match_address'] = search['match_address']
search['best_match_lines'] = search['match_lines']
for varlen in reversed(search['varlen_points']):
if varlen['varlen_delta'] <= 0:
search['varlen_points'].pop()
continue
search['var_vals'] = varlen['var_vals'].copy()
search['match_address'] = varlen['match_address'] # int value
search['re_size'] = varlen['re_size'].copy()
search['match_lines'] = varlen['match_lines'] # int value
search['varlen_inc'] = varlen['varlen_inc']
return True
return False
def armfw_elf_section_search_progress(search, match_address, match_line_size):
""" Update search data after matching next line suceeded.
"""
search['match_lines'] += 1
if search['match_lines'] == 1:
search['match_address'] = match_address
search['re_size'] = []
search['varlen_inc'] = 0
search['re_size'].append(match_line_size)
if search['match_lines'] == len(search['re']):
search['full_matches'].append({'address': search['match_address'], 're': search['re'], 're_size': search['re_size'], 'vars': search['var_vals']})
search['match_lines'] = 0
return search
def armfw_elf_section_search_print_unused_vars(search):
""" Show messages about unused variables defined in the regex.
To be used after a match is found.
"""
for var_name in search['var_defs']:
if var_name in search['var_vals']:
continue
var_val_found = False
# Handle vars with suffixes
for var_val_name in search['var_vals']:
if var_val_name.startswith(var_name+"_"):
var_val_found = True
break
if var_val_found:
continue
print("Variable '{:s}' defined but not used within matched regex".format(var_name))
def armfw_elf_section_search_get_pattern(search):
""" Get regex pattern to match with next line.
"""
re_patterns = search['re']
match_lines = search['match_lines']
return re_patterns[match_lines]
def armfw_elf_section_search_get_next_search_pos(search, sect_offs):
""" Get position to start a next search before resetting current one.
"""
# We intentionally clean 're_size' only on reset, so that it could be used here even after full match
asm_arch = search['asm_arch']
if len(search['re_size']) > 0:
new_offs = search['match_address'] - search['section']['addr'] + min(asm_arch['boundary'],search['re_size'][0])
return new_offs
else:
new_offs = sect_offs + asm_arch['boundary']
return new_offs - (new_offs % asm_arch['boundary'])
def variety_is_signed_int(var_variety):
return var_variety in (DataVariety.INT8_T, DataVariety.INT16_T, DataVariety.INT32_T, DataVariety.INT64_T,)
def variety_is_unsigned_int(var_variety):
return var_variety in (DataVariety.UINT8_T, DataVariety.UINT16_T, DataVariety.UINT32_T, DataVariety.UINT64_T,)
def variety_is_string(var_variety):
return var_variety in (DataVariety.CHAR,)
def variety_is_float(var_variety):
return var_variety in (DataVariety.FLOAT, DataVariety.DOUBLE,)
def armfw_elf_section_search_get_value_variety_size(var_variety):
""" Get expected size of the value
"""
if var_variety in (DataVariety.CHAR, DataVariety.UINT8_T, DataVariety.INT8_T,):
var_size = 1
elif var_variety in (DataVariety.UINT16_T, DataVariety.INT16_T,):
var_size = 2
elif var_variety in (DataVariety.UINT32_T, DataVariety.INT32_T, DataVariety.FLOAT,):
var_size = 4
elif var_variety in (DataVariety.UINT64_T, DataVariety.INT64_T, DataVariety.DOUBLE,):
var_size = 8
else:
var_size = 0
return var_size
def value_type_is_known_address(var_def):
""" Returns whether given type represents an address which can be referenced.
Only some addresses can be converted to global addresses by this tool; an address is known
if it either is global to begin with, or can be converted to global.
If the address is known, property 'value' field will hold the absolute address.
"""
if var_def['type'] in (VarType.RELATIVE_ADDR_TO_CODE, VarType.RELATIVE_ADDR_TO_PTR_TO_CODE,