Ionut
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« Reply #15 on: October 05, 2015, 03:33:04 PM »
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So, to be sure i`m not making a mistake. Should load int flash to 0x8000000 and create ram segments at 0xC000000 and 0xD0000000 What to load at 0xA0000000? Ext flash or other thing? movh.a a2, #0xD001
8000000:0012A6F8 ld32.h d1, 0xD00007DA
8000000:0012A6FC mov16 d0, d1
8000000:0012A6FE lea a2, [a2]-0x5F0C this means that a2 address is 0xD0010000 Than 0x5F0C is substracted from that value, so actual value of a2 is 0xD000A0F4 But for this: movh.a a12, #0xD001
8000000:0005E6F4 lea a12, [a12]-0x544C
8000000:0005E6F8 ld16.bu d15, [a12]0
8000000:0005E6FA and16 d15, #3
8000000:0005E6FC jge.u d15, #4, loc_8005E84E
8000000:0005E700 movh.a a15, #0x8006
8000000:0005E704 addsc16.a a15, a15, d15, #2
8000000:0005E706 ld32.a a15, [a15]-0x6E0C a15 is loaded with 0x80060000 then a15 is offset by d15 value? then a15 is loaded with 0x80060000 - 0x6E0C (if d15 offset is actually 0) = 800591F4 Basically i want to know how to search for maps references. ozzy_rp, how did you discovered that 0x80153DDC is address for table with references? |
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ozzy_rp
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« Reply #16 on: October 05, 2015, 11:52:30 PM »
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So, to be sure i`m not making a mistake. Should load int flash to 0x8000000 and create ram segments at 0xC000000 and 0xD0000000 What to load at 0xA0000000? Ext flash or other thing? movh.a a2, #0xD001
8000000:0012A6F8 ld32.h d1, 0xD00007DA
8000000:0012A6FC mov16 d0, d1
8000000:0012A6FE lea a2, [a2]-0x5F0C this means that a2 address is 0xD0010000 Than 0x5F0C is substracted from that value, so actual value of a2 is 0xD000A0F4 But for this: movh.a a12, #0xD001
8000000:0005E6F4 lea a12, [a12]-0x544C
8000000:0005E6F8 ld16.bu d15, [a12]0
8000000:0005E6FA and16 d15, #3
8000000:0005E6FC jge.u d15, #4, loc_8005E84E
8000000:0005E700 movh.a a15, #0x8006
8000000:0005E704 addsc16.a a15, a15, d15, #2
8000000:0005E706 ld32.a a15, [a15]-0x6E0C a15 is loaded with 0x80060000 then a15 is offset by d15 value? then a15 is loaded with 0x80060000 - 0x6E0C (if d15 offset is actually 0) = 800591F4 Basically i want to know how to search for maps references. ozzy_rp, how did you discovered that 0x80153DDC is address for table with references? Flash memory from 0x80000000h mirrored with 0xA0000000H a15 loaded with 0x80060000 then calc with offset in d15. and load to a15 word from [a15]-0x6E0C  Pay attention to instruction "LEA" and "LD" I don't find 0x80153DDC in disasembly:( http://nefariousmotorsports.com/forum/index.php?topic=6990.msg72154#msg72154 |
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MIL_on
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« Reply #17 on: October 09, 2015, 04:02:12 AM »
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Ionut: Make sure you understand how the map-adresses are called:
1. You have the Table which is filled with Adresses of "areas" but not each single map-adress is stored here, otherwise it might become too big.
2. from the Adress stored in the table you are able to take short offsets which can be stored in 16 bit.
Adresses for better understanding:
rlmx_w = D0001662
Axis Length(0x0012) = 0x8005B05C
Axis = 0x8005B05E - 0x8005B081
LDRXNZK = 0x8005B082 - 0x8005B0A5
so if you are going to reverse the whole mechanism you would start like this:
-you know where your LDRXN-Map and Axis starts and you know which variable gets stored in the routine which uses these maps (rlmx_w). So you take your RAM-Adress of the Variable (rlmx_w) and use the Cross-Reference function. There are 2 Routines which write into that ram cell and 1 reading it. You know that it gets written by the LDRXN Routine, so you are going down one of those 2 paths.
in this routine you will find the following Code:
This is based on the 5K0907115, 0261204474, 1037500440 File!
0000:80106C62 ld32.w d15, [a9]0x638 // Table-Index = a9+offset --> Take adress from [Tablestart+0x638]
0000:80106C66 madd d15, d15, d0, #0x4A // choose LDRXN-Map based on Gearbox-Variant ( 0x4A is the length of one complete Table+Axis+Axis Description!) and store it in d15 again. Lets guess we have a manual trans, so d0 will be 0.
0000:80106C6A ld.hu d4, nmot_w
0000:80106C6E mov16.a a15, d15 // store Adress in adress-register
0000:80106C70 lea a4, [a15]0x69E // load effective adress: a15 holds at that moment [Table-entry+0*0x4A] and we add another 0x69E to that Adress and store it in a4. if you dive into the subfunction which gets called in the next line you will find that a4 has to hold the length of the axis and this is @ Adress 8005B05C.
0000:80106C74 call32 sub_800FDC72
0000:80106C78 st32.h rlmx_w, d2
0000:80106C7C j16 loc_80106C86
So as you know that the end of the calculation has to be 0x8005B05C you can go reverse by: 0x8005B5C - 0x69E = 0x8005A9BE. Search for 8005A9BE in your Hex-Editor in 32bit mode and you will find it @ 0x8016E020. From here you know that you have to subtract 0x638 to get to the table-start! This delivers 0x8016D9E8 which you can use now for all other equations!
Subroutine not explained:
0000:800FDC72 sub_800FDC72: ; CODE XREF: ROM:80071FA8p
0000:800FDC72 ; ROM:80072004p ...
0000:800FDC72 mov16 d5, d4
0000:800FDC74 mov16.aa a15, a4
0000:800FDC76 ld.hu d15, [a15+]2
0000:800FDC7A mov16 d4, d15
0000:800FDC7C mov16.aa a4, a15
0000:800FDC7E call32 sub_80121FDC
0000:800FDC82 addsc16.a a4, a15, d15, #1
0000:800FDC84 mov16 d4, d2
0000:800FDC86 j32 sub_800FA5EE
0000:800FDC86 ; End of function sub_800FDC72
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« Last Edit: October 09, 2015, 04:06:03 AM by MIL_on »
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ozzy_rp
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« Reply #18 on: October 11, 2015, 08:16:50 AM »
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Small hint to find a0 and a1.
from my med17 file.
PFLASH:8010EB0E mfcr d0, #0xFE04
PFLASH:8010EB12 or32 d15, d0, #0x100
PFLASH:8010EB16 mtcr #0xFE04, d15
PFLASH:8010EB1A isync
PFLASH:8010EB1E movh.a a0, #@HIS(Base_a0_addr) ; Load base address for RAM
PFLASH:8010EB22 lea a0, [a0]@LOS(Base_a0_addr) ; Load base address for RAM offsets
PFLASH:8010EB26 movh.a a1, #@HIS(Base_a1_addr) ; Base a1 address 0x8002CE78
PFLASH:8010EB26 ; for offsets
PFLASH:8010EB2A lea a1, [a1]@LOS(Base_a1_addr) ; Load base address 0x8002CE78
PFLASH:8010EB2E mov16.a a8, #0
PFLASH:8010EB30 mov16.a a9, #0
PFLASH:8010EB32 mtcr #0xFE04, d0
PFLASH:8010EB36 isync
PFLASH:8010EB3A isync
PFLASH:8010EB3E dsync
PFLASH:8010EB42 mfcr d0, #0xFE00
PFLASH:8010EB46 movh d1, #0xFFF0
PFLASH:8010EB4A and16 d0, d1
PFLASH:8010EB4C mtcr #0xFE00, d0
PFLASH:8010EB50 isync
PFLASH:8010EB54 movh d0, #0xD000
PFLASH:8010EB58 addi d0, d0, #0x18
PFLASH:8010EB5C addi d0, d0, #0x3F
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hackish
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« Reply #19 on: October 20, 2015, 07:23:28 AM »
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Something to keep in mind, make sure you're running the absolute latest release of IDA Pro. The last tricore file I worked on (this summer) I found a significant number of bugs in the tricore module. Ilfak fixed them (within hours as he usually does) and sent me an updated processor module. It made a huge difference on things that were disassembling completely wrong. I expect that it's been released with the latest update but make sure you're not on an old version.
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terminator
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« Reply #20 on: October 20, 2015, 11:40:56 AM »
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Bug? For example?
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ozzy_rp
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« Reply #21 on: October 20, 2015, 01:00:43 PM »
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I have seen bug with post increment indirect addressing with offset....
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hackish
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« Reply #22 on: October 26, 2015, 10:40:34 PM »
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Bug? For example?
I don't remember all of them. That was like 6 months and 3 processors ago. There was a lot of incorrectly decoded instructions/offsets in there. Check out the changes log - they usually list the fixes they made in there. |
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dream3R
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« Reply #23 on: December 25, 2015, 04:49:14 PM »
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Tricore is difficult with the net versions lol.
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dream3R
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« Reply #24 on: December 30, 2015, 07:38:10 PM »
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I wish he did a version for non pro outfits. It's great and expensive too.
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kuebk
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« Reply #25 on: February 24, 2016, 03:50:24 PM »
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Very interesting topic. I'm trying my best to understand the ASM which stays behind our EDC17 ECUs but I can't make past such subroutines: ROM:0014E760 sub_14E760: ; CODE XREF: sub_532DE+BD8p
ROM:0014E760 ; sub_532DE+C42p ...
ROM:0014E760 movh.a a2, #@HIS(unk_D40009D8)
ROM:0014E764 lea a2, [a2]@LOS(unk_D40009D8)
ROM:0014E768 nop16
ROM:0014E76A ji16 a2
ROM:0014E76A ; End of function sub_14E760
I have no idea how can I find out what is going to be executed, can you guys give me any tips? |
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VAG immo solutions (clone, immo off, repair) MEDC17, SIMOS, SDI, BCM2, ELV, DQ/DL/VL gearboxes, INVCON, MED9.x crypto
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ozzy_rp
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« Reply #26 on: February 24, 2016, 11:27:14 PM »
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In this block, have several procedures that copy data from FLASH to RAM. They use a structure such as: PFLASH:8002DDBC stru_8002DDBC copy_block_struct2 <unk_D4001520, PRAM_data, 0>
PFLASH:8002DDBC ; Start data copyed to PRAM
PFLASH:8002DDC8 copy_block_struct2 <dword_D0000018, LDRAM_data1, 0x10> ; Data copyed to DMI Local Data RAM
PFLASH:8002DDC8 ; leight 0x10
PFLASH:8002DDD4 copy_block_struct2 <dword_D0008180, LDRAM_data2, 0x8A0> ; Start data copyed to DMI Local Data RAM
PFLASH:8002DDD4 ; Leigh 0x8A0
PFLASH:8002DDE0 copy_block_struct2 <off_D0008A20, LDRAM_data3, 0x230> ; Start data copyed to LDRAM
PFLASH:8002DDE0 ; leight 0x230
PFLASH:8002DDEC copy_block_struct2 <unk_D0009800, LDRAM_data4, 0>
PFLASH:8002DDF8 copy_block_struct2 <loc_D4000000, SPRAM_sub, 0x1520> ; Start program block from SPRAM
PFLASH:8002DDF8 ; This block copyed to 0xD4000000 leight 0x1520
PFLASH:8002DE04 copy_block_struct2 <unk_F0060000, PCODE_data, 0x2060> ; Start data copyed to PCODE
PFLASH:8002DE04 ; leigh 0x2060
PFLASH:8002DE10 copy_block_struct2 <dword_F0050000, PRAM_data, 0xDC0> ; Start data copyed to PRAM
PFLASH:8002DE10 ; Leight 0xDC0
PFLASH:8000FA60 Copy_to_ram_struct Copy_to_RAM_struct <dword_800045F0, 0xD4001400, 0x80>
PFLASH:8000FA60 ; Copy to RAM Struct:
PFLASH:8000FA60 ; offset 0x00 - Source address in FLASH
PFLASH:8000FA60 ; offset 0x04 - Destination address in RAM
PFLASH:8000FA60 ; offset 0x08 - leight
PFLASH:8000FA6C Copy_to_RAM_struct <dword_80004670, 0xD4001500, 0x220>
PFLASH:8000FA78 Copy_to_RAM_struct <sub_80004890, 0xD0000AC8, 0x99F0>
PFLASH:8000FA84 Copy_to_RAM_struct <loc_8000E280, 0xD4001720, 0xD18>
PFLASH:8000FA90 Copy_to_RAM_struct <off_8000EF98, 0xD000A4B8, 0x458>
PFLASH:8000FA9C Copy_to_RAM_struct <dword_8000F3F0, 0xD000A910, 0x670>
PFLASH:8000FAA8 Copy_to_RAM_struct <0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF>
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kuebk
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« Reply #27 on: February 25, 2016, 12:52:02 PM »
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Thank you. So it seems like: ROM:8002ACC0 copy_block <0xC0003BE0, 0x80023F58, 0xCA0>
ROM:8002ACCC copy_block <0xC0004880, 0x80024BF8, 0x4B6>
ROM:8002ACD8 copy_block <0xD000E000, 0x800250AE, 0>
ROM:8002ACE4 copy_block <0xD4000000, 0x80020098, 0x1620>
ROM:8002ACF0 copy_block <0xF0060000, 0x800223B8, 0x1BA0>
ROM:8002ACFC copy_block <0xF0050000, 0x800216B8, 0xD00>
ROM:8014E760 sub_14E760: ; CODE XREF: sub_532DE+BD8p
ROM:8014E760 ; sub_532DE+C42p ...
ROM:8014E760 movh.a a2, #@HIS(unk_D40009D8) ; D40009D8 = 0x80020A70 = 0x49094F94 // a2 = 4909
ROM:8014E764 lea a2, [a2]@LOS(unk_D40009D8) // a2 = 4909 + 4f94
ROM:8014E768 nop16
ROM:8014E76A ji16 a2 // a2 = 989D
ROM:8014E76A ; End of function sub_14E760 But at 8000989D I'm landing in the middle of other subroutine: ROM:80009870 sub_9870: ; CODE XREF: ROM:00009732p
ROM:80009870 ; sub_980E+48p ...
ROM:80009870 lea a15, [a0]0x43F
ROM:80009874 mov16 d5, #0
ROM:80009876 lea a2, [a0]0x430
ROM:8000987A movh.a a4, #@HIS(word_D0001648)
ROM:8000987E ld16.bu d15, [a15]0
ROM:80009880 lea a15, [a0]0x434
ROM:80009884 lea a5, [a0]0x444
ROM:80009888 lea a4, [a4]@LOS(word_D0001648)
ROM:8000988C ld.hu d4, [a15]0
ROM:80009890 add16 d4, d15
ROM:80009892 sha16 d15, #2
ROM:80009894 extr.u d4, d4, #0, #0x10
ROM:80009898 add32 d15, d15, #0x24
ROM:8000989C addsc16.a a15, a2, d15, #0
ROM:8000989E mov16 d15, #3
ROM:800098A0 st16.w [a15]0, d5
ROM:800098A2 call32 sub_AC52
ROM:800098A6 mov32 d0, #0xA
ROM:800098AA jne32 d2, d0, loc_98B8
ROM:800098AE mov16 d15, #0
ROM:800098B0 lea a15, [a0]0x43B
ROM:800098B4 st16.b [a15]0, d15
ROM:800098B6 mov16 d15, #0
ROM:800098B8
ROM:800098B8 loc_98B8: ; CODE XREF: sub_9870+3Aj
ROM:800098B8 mov16 d2, d15
ROM:800098BA ret16
ROM:800098BA ; End of function sub_9870
I think my calculations are not done correctly, what you think? |
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ozzy_rp
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« Reply #28 on: February 25, 2016, 03:41:40 PM »
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Thank you. So it seems like: ROM:8002ACC0 copy_block <0xC0003BE0, 0x80023F58, 0xCA0> ROM:8002ACCC copy_block <0xC0004880, 0x80024BF8, 0x4B6> ROM:8002ACD8 copy_block <0xD000E000, 0x800250AE, 0> ROM:8002ACE4 copy_block <0xD4000000, 0x80020098, 0x1620> ROM:8002ACF0 copy_block <0xF0060000, 0x800223B8, 0x1BA0> ROM:8002ACFC copy_block <0xF0050000, 0x800216B8, 0xD00> ROM:8014E760 sub_14E760: ; CODE XREF: sub_532DE+BD8p ROM:8014E760 ; sub_532DE+C42p ... ROM:8014E760 movh.a a2, #@HIS(unk_D40009D8) ; D40009D8 = 0x80020A70 = 0x49094F94 // a2 = 4909 ROM:8014E764 lea a2, [a2]@LOS(unk_D40009D8) // a2 = 4909 + 4f94 ROM:8014E768 nop16 ROM:8014E76A ji16 a2 // a2 = 989D ROM:8014E76A ; End of function sub_14E760 But at 8000989D I'm landing in the middle of other subroutine: I think my calculations are not done correctly, what you think? You wrong at: ROM:8014E764 lea a2, [a2]@LOS(unk_D40009D8) // a2 = 4909 + 4f94 Here a2=0xD40009D8 And 0xD40009D8-0xD4000000=0x9D8 Remember copy_block <0xD4000000, 0x80020098, 0x1620> Add 0x9D8 to 0x80020098 and we have 0x80020A70 |
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superglitch
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« Reply #29 on: March 15, 2016, 03:36:45 PM »
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movh.a a15, #@HIS(CRC_end_addr) ;
st32.w [a15]@LOS(CRC_end_addr), d0 ;
b:
sha16 d15, #4
movh.a a3, #@HIS(RAM_crc_table) ;
lea a3, [a3]@LOS(RAM_crc_table) ;
addsc16.a a2, a3, d15, #0 ;
Do you have these actually defined? Curious what they are. |
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