Open Source Checker for ME7...

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360trev

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	Re: Open Source Checker for ME7... « Reply #90 on: January 03, 2013, 05:00:51 PM »

Quote from: nyet on January 03, 2013, 04:56:30 PM

360: it already detects the multipoint no problem; i just loosened the matching parameters some (see latest git checkin).. what i cant' find is the CRC blocks

Yes, but this way should be guarenteed for ANY variant, it derives it from the actual code init function, without using signatures which may or may not always work and could hit false positives.

Here's the full checksum routine incase anyone is interested, it requires fully commenting however...

Code:


Multipoint:
		mov	[-r0], r9
		mov	[-r0], r8
		mov	[-r0], r7
		mov	[-r0], r6
		calls	86h, CHECK1
		movb	rl4, loop_counter
		cmpb	rl4, #1
		jmpa	cc_NZ, exit_chk
		movb	rl5, initvar3
		cmpb	rl5, #4
		jmpr	cc_NC, chk2
		mov	r8, MainRom_Checksum_START_Low_cpy
		mov	r9, MainRom_Checksum_START_High_cpy
		mov	r7, #0
		jmpr	cc_UC, Check_Done_1024

chk7:
		exts	r9, #1
		mov	r4, [r8]
		mov	r5, #0
		add	initvar1, r4
		addc	initvar2, r5
		add	r8, #2
		addc	r9, #0
		add	r7, #1

Check_Done_1024:
		cmp	r7, #1024
		jmpr	cc_NC, chk5
		mov	r4, r8
		mov	r5, r9
		sub	r4, MainRom_Checksum_End_Low_Cpy
		subc	r5, MainRom_Checksum_End_High_Cpy
		jmpr	cc_C, chk7

chk5:
		mov	MainRom_Checksum_START_Low_cpy,	r8
		mov	MainRom_Checksum_START_High_cpy, r9
		mov	r4, r8
		mov	r5, r9
		sub	r4, MainRom_Checksum_End_Low_Cpy
		subc	r5, MainRom_Checksum_End_High_Cpy
		jmpa	cc_C, exit_chk
		jmpr	cc_UC, chk4

chk2:
		mov	r4, initvar1
		mov	r5, initvar2
		extp	#543, #2
		sub	r4, Checksum_Final_Hi
		subc	r5, Checksum_Final_Lo
		jmpr	cc_NZ, chk1
		mov	r4, #1B00h
		mov	r5, #0E0h
		extp	r5, #1
		movb	rl3, [r4]
		orb	rl3, #8
		mov	r4, #1B00h
		mov	r5, #0E0h
		extp	r5, #1
		movb	[r4], rl3
		jmpr	cc_UC, chk3

chk1:
		mov	r4, #1B00h
		mov	r5, #0E0h
		extp	r5, #1
		movb	rl3, [r4]
		andb	rl3, #0F7h
		mov	r4, #1B00h
		mov	r5, #0E0h
		extp	r5, #1
		movb	[r4], rl3

chk3:
		movb	loop_counter, ZEROS
		jmpr	cc_UC, exit_chk

chk4:
		movb	rl4, #2
		addb	initvar3, rl4
		movbz	r6, initvar3
		shl	r6, #2
		extp	#206h, #3
		mov	r4, [r6+3FE6h]
		mov	r5, [r6+3FE8h]
		nop
		mov	MainRom_Checksum_START_Low_cpy,	r4
		mov	MainRom_Checksum_START_High_cpy, r5
		extp	#206h, #3
		mov	r4, [r6+3FEAh]
		mov	r5, [r6+3FECh]
		nop
		mov	MainRom_Checksum_End_Low_Cpy, r4
		mov	MainRom_Checksum_End_High_Cpy, r5

exit_chk:
		mov	r6, [r0+]
		mov	r7, [r0+]
		mov	r8, [r0+]
		mov	r9, [r0+]
		rets


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nyet

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	Re: Open Source Checker for ME7... « Reply #91 on: January 03, 2013, 05:09:01 PM »

Success!

for 4 block, i just let the CRC accumulate through all 5 regions

Code:

0: Adr: 0x8183E9-0x8183F2                         CalcCRC: F9A70C59 (seed 00000000)
1: Adr: 0x810002-0x813FFE @0x90000 CRC: 13BFD815  CalcCRC: 13BFD815 (seed F9A70C59)  CRC OK
2: Adr: 0x814252-0x817F4E @0x90006 CRC: 8C92421A  CalcCRC: 8C92421A (seed 13BFD815)  CRC OK
3: Adr: 0x818192-0x81FBDC                         CalcCRC: 07E6F36A (seed 8C92421A)
4: Adr: 0x826A00-0x82FFFC @0x9000c CRC: C95513B5  CalcCRC: C95513B5 (seed 07E6F36A)  CRC OK

phila: i need a way to detect the 0x8183e9 range...

360: ok, i will try to use what you gave me to do a better job looking for start.

actually, if you can give me an exact needle/mask pair that would be ideal


« Last Edit: January 03, 2013, 05:37:05 PM by nyet »	Logged

ME7.1 tuning guide
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phila_dot

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	Re: Open Source Checker for ME7... « Reply #92 on: January 03, 2013, 05:34:42 PM »

This work?

E6 FC LL LL E6 FD HH HH E0 sE DA XX XX XX F6 F4

s == length in bytes


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nyet

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	Re: Open Source Checker for ME7... « Reply #93 on: January 03, 2013, 05:39:09 PM »

Phila, trying it now.

Are you sure the other two regions aren't checked anywhere?


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phila_dot

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	Re: Open Source Checker for ME7... « Reply #94 on: January 03, 2013, 05:49:50 PM »

Quote from: nyet on January 03, 2013, 05:39:09 PM

Phila, trying it now.

Are you sure the other two regions aren't checked anywhere?

Other two as in 0 and 3 in your previous post? Not checked.


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nyet

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	Re: Open Source Checker for ME7... « Reply #95 on: January 03, 2013, 06:26:16 PM »

F K and Q all work now, which leaves ferrari's bin, and

4Z7907551S
8D0907551C
8D0907551T

T is curious, there seems to be a false match

8D0907551T:

Code:

Found CRC #1 at 0x81b494
Found CRC #2 at 0x87d94c
Found CRC #3 at 0x87d952
Found CRC #4 at 0x87d958
Found CRC #5 at 0x87e350

0: Adr: 0x81840A-0x818413                         CalcCRC: 7232DBBC (seed 00000000)
1: Adr: 0x810002-0x813FFE @0x1b494 CRC: 00800000  CalcCRC: F57794F2 (seed 7232DBBC)  ** NOT OK **
2: Adr: 0x814252-0x817F4E @0x7d94c CRC: F57794F2  CalcCRC: 0E24D8DF (seed F57794F2)  ** NOT OK **
3: Adr: 0x818192-0x81FBAC                         CalcCRC: 891D9138 (seed 0E24D8DF)
4: Adr: 0x81FBAE-0x81FBB0 @0x7d952 CRC: 0E24D8DF  CalcCRC: DEDB9C23 (seed 891D9138)  ** NOT OK **

4Z7907551S.bin cant find offsets at all


« Last Edit: January 03, 2013, 06:35:07 PM by nyet »	Logged

nyet

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	Re: Open Source Checker for ME7... « Reply #96 on: January 03, 2013, 06:37:43 PM »

err after some code tweaking:

Code:

Found CRC #1 at 0x81b494
Found CRC #2 at 0x87d94c
Found CRC #3 at 0x87d952
Found CRC #4 at 0x87d958
Found CRC #5 at 0x87e350
0: Adr: 0x81840A-0x818413                         CalcCRC: 7232DBBC (seed 00000000)
1: Adr: 0x810002-0x813FFE @0x1b494 CRC: 00800000  CalcCRC: F57794F2 (seed 7232DBBC)  ** NOT OK **
2: Adr: 0x814252-0x817F4E @0x7d94c CRC: F57794F2  CalcCRC: 0E24D8DF (seed F57794F2)  ** NOT OK **
3: Adr: 0x818192-0x81FBAC @0x7d952 CRC: 0E24D8DF  CalcCRC: 891D9138 (seed 0E24D8DF)  ** NOT OK **
4: Adr: 0x81FBAE-0x81FBB0 @0x7d958 CRC: DEDB9C23  CalcCRC: DEDB9C23 (seed 891D9138)  CRC OK

ETA: works with this search pattern, but that pattern doesn't work with the other boxes Sad

Code:

uint8_t needle[] = {0xEA, 0xA5, 0xE6, 0xF4, 0x00, 0x00, 0xE6, 0xF5, 0x00, 0x00, 0xDA, 0x00, 0xD8, 0x7E};
uint8_t   mask[] = {0xff, 0xff, 0xff, 0xff, 0x00, 0x00, 0xff, 0xff, 0x00, 0x00, 0xff, 0xff, 0xff, 0xff};

Code:

Found CRC #1 at 0x87d94c
Found CRC #2 at 0x87d952
Found CRC #3 at 0x87d958
0: Adr: 0x81840A-0x818413                         CalcCRC: 7232DBBC (seed 00000000)
1: Adr: 0x810002-0x813FFE @0x7d94c CRC: F57794F2  CalcCRC: F57794F2 (seed 7232DBBC)  CRC OK
2: Adr: 0x814252-0x817F4E @0x7d952 CRC: 0E24D8DF  CalcCRC: 0E24D8DF (seed F57794F2)  CRC OK
3: Adr: 0x818192-0x81FBAC                         CalcCRC: 891D9138 (seed 0E24D8DF)
4: Adr: 0x81FBAE-0x81FBB0 @0x7d958 CRC: DEDB9C23  CalcCRC: DEDB9C23 (seed 891D9138)  CRC OK


« Last Edit: January 03, 2013, 07:24:53 PM by nyet »	Logged

jooo

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	Re: Open Source Checker for ME7... « Reply #97 on: January 03, 2013, 07:44:36 PM »

Quote from: 360trev on January 03, 2013, 04:52:21 PM

The question now is how to convert the asm instruction relative offsets to byte offsets in the file?
...I believe a clue is to do with the segmented memory model of the C167, [c167 asm guys help me out here!].

Somewhat described here
http://nefariousmotorsports.com/forum/index.php?topic=1735.0
and some other threads in Reverse Engineering board


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nyet

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	Re: Open Source Checker for ME7... « Reply #98 on: January 03, 2013, 07:49:37 PM »

For those of you looking for patterns, here are the hexdumps near the matched areas

M box:

Code:

Found possible CRC offset #1 at 0x87a866 (from 0x7ac96)
f6 f5 4a aa [ e6 f4 66 a8 e6 f5 87 00 da 00 d8 7e ] f4 66 a8 e6 
Found possible CRC offset #2 at 0x87a86c (from 0x7ad28)
f6 f5 4e aa [ e6 f4 6c a8 e6 f5 87 00 da 00 d8 7e ] f4 6c a8 e6 
Found possible CRC offset #3 at 0x87a872 (from 0x7adb8)
f6 f5 52 aa [ e6 f4 72 a8 e6 f5 87 00 da 00 d8 7e ] f4 72 a8 e6 
Found CRC #1 at 0x87a866
Found CRC #2 at 0x87a86c
Found CRC #3 at 0x87a872
1: Adr: 0x810002-0x813FFE @0x7a866 CRC: 214CD272  CalcCRC: 214CD272 (seed 00000000)  CRC OK
2: Adr: 0x814252-0x817F4E @0x7a86c CRC: 17B90F53  CalcCRC: 17B90F53 (seed 00000000)  CRC OK
3: Adr: 0x818192-0x81FBB0 @0x7a872 CRC: 7DE91383  CalcCRC: 7DE91383 (seed 00000000)  CRC OK

K box:

Code:

Searching for main ROM CRC offsets...
Found possible CRC offset #1 at 0x890000 (from 0x904a2)
f6 f5 da a8 [ e6 f4 00 00 e6 f5 89 00 da 00 d8 7e ] f4 00 00 e6 
Found possible CRC offset #2 at 0x890006 (from 0x90522)
f6 f5 da a8 [ e6 f4 06 00 e6 f5 89 00 da 00 d8 7e ] f4 06 00 e6 
Found possible CRC offset #3 at 0x89000c (from 0x905aa)
f6 f5 da a8 [ e6 f4 0c 00 e6 f5 89 00 da 00 d8 7e ] f4 0c 00 e6 
Found CRC #1 at 0x890000
Found CRC #2 at 0x890006
Found CRC #3 at 0x89000c
0: Adr: 0x8183E9-0x8183F2                         CalcCRC: F9A70C59 (seed 00000000)
1: Adr: 0x810002-0x813FFE @0x90000 CRC: 13BFD815  CalcCRC: 13BFD815 (seed F9A70C59)  CRC OK
2: Adr: 0x814252-0x817F4E @0x90006 CRC: 8C92421A  CalcCRC: 8C92421A (seed 13BFD815)  CRC OK
3: Adr: 0x818192-0x81FBDC                         CalcCRC: 07E6F36A (seed 8C92421A)
4: Adr: 0x826A00-0x82FFFC @0x9000c CRC: C95513B5  CalcCRC: C95513B5 (seed 07E6F36A)  CRC OK

T box:

Code:

Found possible CRC offset #1 at 0x81b494 (from 0x37de6)
f7 8e 0f 97 [ e6 f4 94 b4 e6 f5 81 00 da 00 d8 7e ] f4 94 b4 e6 
Found possible CRC offset #2 at 0x87d94c (from 0x7df06)
f6 f5 ea a5 [ e6 f4 4c d9 e6 f5 87 00 da 00 d8 7e ] f4 4c d9 e6 
Found possible CRC offset #3 at 0x87d952 (from 0x7df86)
f6 f5 ea a5 [ e6 f4 52 d9 e6 f5 87 00 da 00 d8 7e ] f4 52 d9 e6 
Found possible CRC offset #4 at 0x87d958 (from 0x7e00e)
f6 f5 ea a5 [ e6 f4 58 d9 e6 f5 87 00 da 00 d8 7e ] f4 58 d9 e6 
Found possible CRC offset #5 at 0x87e350 (from 0x7e1dc)
e4 a0 04 00 [ e6 f4 50 e3 e6 f5 87 00 da 00 d8 7e ] f4 50 e3 e6 
Found CRC #1 at 0x81b494
Found CRC #2 at 0x87d94c
Found CRC #3 at 0x87d952
Found CRC #4 at 0x87d958
Found CRC #5 at 0x87e350
Did not find exactly 3 matches (got 5). CRC offset find failed
0: Adr: 0x81840A-0x818413                         CalcCRC: 7232DBBC (seed 00000000)
1: Adr: 0x810002-0x813FFE @0x1b494 CRC: 00800000  CalcCRC: F57794F2 (seed 7232DBBC)  ** NOT OK **
2: Adr: 0x814252-0x817F4E @0x7d94c CRC: F57794F2  CalcCRC: 0E24D8DF (seed F57794F2)  ** NOT OK **
3: Adr: 0x818192-0x81FBAC @0x7d952 CRC: 0E24D8DF  CalcCRC: 891D9138 (seed 0E24D8DF)  ** NOT OK **
4: Adr: 0x81FBAE-0x81FBB0 @0x7d958 CRC: DEDB9C23  CalcCRC: DEDB9C23 (seed 891D9138)  CRC OK

maybe that f6 f5 XX XX sequence?


« Last Edit: January 03, 2013, 07:52:10 PM by nyet »	Logged

nyet

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	Re: Open Source Checker for ME7... « Reply #99 on: January 03, 2013, 08:02:54 PM »

This seems to work for everything but 8D0907551C and 4Z7907551S

comments?

Code:

//                                                        LL    LL                HH    HH
uint8_t needle[] = {0xF6, 0xF5, 0x00, 0x00, 0xE6, 0xF4, 0x00, 0x00, 0xE6, 0xF5, 0x00, 0x00, 0xDA, 0x00, 0xD8, 0x7E};
uint8_t   mask[] = {0xff, 0xff, 0x00, 0x00, 0xff, 0xff, 0x00, 0x00, 0xff, 0xff, 0x00, 0x00, 0xff, 0xff, 0xff, 0xff};


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phila_dot

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	Re: Open Source Checker for ME7... « Reply #100 on: January 03, 2013, 08:40:50 PM »

Quote from: nyet on January 03, 2013, 08:02:54 PM

This seems to work for everything but 8D0907551C and 4Z7907551S

comments?

Code:

//                                                        LL    LL                HH    HH
uint8_t needle[] = {0xF6, 0xF5, 0x00, 0x00, 0xE6, 0xF4, 0x00, 0x00, 0xE6, 0xF5, 0x00, 0x00, 0xDA, 0x00, 0xD8, 0x7E};
uint8_t   mask[] = {0xff, 0xff, 0x00, 0x00, 0xff, 0xff, 0x00, 0x00, 0xff, 0xff, 0x00, 0x00, 0xff, 0xff, 0xff, 0xff};

Different ROM?

That's a call to ROM function at the end. Hardcoding addresses isn't always a good idea.


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phila_dot

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	Re: Open Source Checker for ME7... « Reply #101 on: January 03, 2013, 08:48:39 PM »

This works in four files I checked real quick.

E6 F4 XX XX E6 F5 XX XX DA 00 XX XX E6 00 04 02


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nyet

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	Re: Open Source Checker for ME7... « Reply #102 on: January 03, 2013, 09:01:49 PM »

Do you mean:

ETA: err nvm gimme a sec


« Last Edit: January 03, 2013, 09:06:52 PM by nyet »	Logged

nyet

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	Re: Open Source Checker for ME7... « Reply #103 on: January 03, 2013, 09:08:54 PM »

Doesn't work for t-box

Code:

Found possible CRC offset #1 at 0x81b494 (from 0x37de6)
f7 8e 0f 97 [e6 f4 94 b4 e6 f5 81 00 da 00 d8 7e e6 00 04 02] f4 94 b4 e6
Found possible CRC offset #2 at 0x87d94c (from 0x7df06)
f6 f5 ea a5 [e6 f4 4c d9 e6 f5 87 00 da 00 d8 7e e6 00 04 02] f4 4c d9 e6
Found possible CRC offset #3 at 0x87d952 (from 0x7df86)
f6 f5 ea a5 [e6 f4 52 d9 e6 f5 87 00 da 00 d8 7e e6 00 04 02] f4 52 d9 e6
Found possible CRC offset #4 at 0x87d958 (from 0x7e00e)
f6 f5 ea a5 [e6 f4 58 d9 e6 f5 87 00 da 00 d8 7e e6 00 04 02] f4 58 d9 e6
Found possible CRC offset #5 at 0x87e350 (from 0x7e1dc)
e4 a0 04 00 [e6 f4 50 e3 e6 f5 87 00 da 00 d8 7e e6 00 04 02] f4 50 e3 e6


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	Re: Open Source Checker for ME7... « Reply #104 on: January 03, 2013, 09:11:40 PM »

This does though (prepend f6 f5 xx xx)

Code:

needle[] = {0xF6, 0xF5, 0x00, 0x00, 0xE6, 0xF4, 0x00, 0x00, 0xE6, 0xF5, 0x00, 0x00, 0xDA, 0x00, 0x00, 0x00, 0xe6, 0x00, 0x04, 0x02};
  mask[] = {0xff, 0xff, 0x00, 0x00, 0xff, 0xff, 0x00, 0x00, 0xff, 0xff, 0x00, 0x00, 0xff, 0xff, 0x00, 0x00, 0xff, 0xff, 0xff, 0xff};

4Z7907551S is still broken, of course

ETA: with the F6 F5 XX XX i dont even seem to need the e6 00 04 02 tail...


« Last Edit: January 03, 2013, 09:17:07 PM by nyet »	Logged

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