LC/NLS ASM help

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BlackT

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	Re: LC/NLS ASM help « Reply #75 on: March 02, 2023, 12:53:02 AM »

Thank you that is really helpfull


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BlackT

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	Re: LC/NLS ASM help « Reply #76 on: September 14, 2023, 01:52:15 PM »

EDIT: solved, I see I move R4 to byte. But let it stay for other users if someone make this silly mistake

I am trying to make rolling LC, and i have problem with this code section

Code:

ROM:008C0030 9A 29 21 F0                       jnb     word_FD52.15, loc_8C0076
ROM:008C0034 9A 6D 08 40                       jnb     word_FDDA.4, loc_8C0048
ROM:008C0038 4E 6D                             bclr    word_FDDA.4
ROM:008C003A 4E 6D                             bclr    word_FDDA.4
ROM:008C003C F2 F4 9E F8                       mov     r4, nmot_w
ROM:008C0040 F6 F4 DB F8                       mov     byte_F8DB, r4
ROM:008C0044 CC 00                             nop
ROM:008C0046 0D 1A                             jmpr    cc_UC, loc_8C007C
ROM:008C0048                   ; ---------------------------------------------------------------------------
ROM:008C0048
ROM:008C0048                   loc_8C0048:                             ; CODE XREF: sub_8BFEF8+13C↑j
ROM:008C0048 F2 F4 9E F8                       mov     r4, nmot_w
ROM:008C004C CC 00                             nop
ROM:008C004E CC 00                             nop
ROM:008C0050 F2 F9 DB F8                       mov     r9, byte_F8DB
ROM:008C0054 40 49                             cmp     r4, r9
ROM:008C0056 FD 12                             jmpr    cc_ULE, loc_8C007C
ROM:008C0058 CC 00                             nop
ROM:008C005A F2 F4 98 9E                       mov     r4, vfil_w
ROM:008C005E D7 00 81 00                       exts    #81h, #1
ROM:008C0062 F2 F9 D8 7E                       mov     r9, word_817ED8
ROM:008C0066 40 49                             cmp     r4, r9
ROM:008C0068 FD 09                             jmpr    cc_ULE, loc_8C007C
ROM:008C006A 6F 6D                             bset    word_FDDA.6
ROM:008C006C F7 8E B6 8C                       movb    tsrldyn, ZEROS
ROM:008C0070 CC 00                             nop
ROM:008C0072 CC 00                             nop
ROM:008C0074 0D 03                             jmpr    cc_UC, loc_8C007C
ROM:008C0076                   ; ---------------------------------------------------------------------------
ROM:008C0076
ROM:008C0076                   loc_8C0076:                             ; CODE XREF: sub_8BFEF8:loc_8C0030↑j
ROM:008C0076 CC 00                             nop
ROM:008C0078 6E 6D                             bclr    word_FDDA.6
ROM:008C007A 4F 6D                             bset    word_FDDA.4
ROM:008C007C
ROM:008C007C                   loc_8C007C:                             ; CODE XREF: sub_8BFEF8+14E↑j
ROM:008C007C                                                           ; sub_8BFEF8+15E↑j ...
ROM:008C007C FA 8B E4 FF                       jmps    8Bh, loc_8BFFE4

I get EPC light and car shuts down

FDDA and FDDB variables are free, as I am manage to see

maybe this is problem?

ROM:008C003C F2 F4 9E F8 mov r4, nmot_w
ROM:008C0040 F6 F4 DB F8 mov byte_F8DB, r4

Is this okay to do?


« Last Edit: September 14, 2023, 01:54:00 PM by BlackT »	Logged

BlackT

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	Re: LC/NLS ASM help « Reply #77 on: September 24, 2023, 03:25:31 AM »

Can someone explain me what is this whit this function with zwout?
Is this mean that zwout is stored in stack in four places?


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fknbrkn

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	Re: LC/NLS ASM help « Reply #78 on: September 24, 2023, 06:46:13 AM »

For each cylinder


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BlackT

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	Re: LC/NLS ASM help « Reply #79 on: November 23, 2023, 04:10:57 PM »

In this file KFZW load axis should be at 0x132E6
And table look like it, but when I change that load values nothing happen? It always follow same load. Let say 40% is original load in 3th column. If I multiply whole load table with 2, ECU still get that value from 3th column when load is 40% Huh


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BlackT

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	Re: LC/NLS ASM help « Reply #80 on: December 09, 2024, 07:45:09 AM »

Let say at 06A906032HS
SW: 1037363908

FPWDKAPP is at 0x14F72

How to find that in IDA?


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fknbrkn

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	Re: LC/NLS ASM help « Reply #81 on: December 09, 2024, 10:15:31 AM »

Quote from: BlackT on December 09, 2024, 07:45:09 AM

Let say at 06A906032HS
SW: 1037363908

FPWDKAPP is at 0x14F72

How to find that in IDA?

there are few guides at new about map location

check axis size before map axis, easiest way if its cross-referenced
try to search '4F72' as map start or similar for axis size offset before map, should look like like 'mov r12, #4F72h' , or r4,r5
if both ways not give you any results, check FR for a program flow, if its generates some variable or 1x1 map nearby trace where it written
in this case WKDSAPP / WDKSOFS easily gets you in the right place


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Blazius

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	Re: LC/NLS ASM help « Reply #82 on: December 09, 2024, 04:39:37 PM »

Quote from: BlackT on December 09, 2024, 07:45:09 AM

Let say at 06A906032HS
SW: 1037363908

FPWDKAPP is at 0x14F72

How to find that in IDA?

First, you should check what kind of map it is 2D or 3D, as the function will differ.
FPWDKAPP being a 2D map , it will use a 2D lookup, which generally uses a offset, page number, and the value for the axis. The offset is the start of the map where it actually sets the size, not the start of the values of the axis itself.

In this case of rather the C167 based hardware or code , the lookup only contains the offset, and the axis value in this the wped_w, because the page is default at 204.

For example in M box, FPWDKAPP is at 813EB6 or rather 813ED8 if going only by the values and winols representation. The offset is 3EB6 hex, the page is default 204 which means 4000*204 = 810000 , and the axis is wped_w. 810000 + 3EB6 = 813EB6


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BlackT

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	Re: LC/NLS ASM help « Reply #83 on: January 24, 2025, 02:47:40 AM »

Thank you guys for explenation everything is clear now.

Next I will try to make my own 2D map


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