Re: dosbox debugger problems

Posted on 2014-01-05, 11:46

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by llm

in DOSBox Development

in DOSBox Development

@ripsaw8080 - thx to your fix - now all my former not/partial working breakpoints work now but still the red line is sometime not shown on the breakpoint line (seem to be something similar) i've found this code in debug.cpp responsible for the red background - and it seems to be correct, maybe my …

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Re: dosbox debugger problems

Posted on 2014-01-05, 11:06

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by llm

in DOSBox Development

in DOSBox Development

It's not a regression but annoying enough to be near to Ah, the address is already being stored, so the more optimized change is:... I'll test it like this for awhile to see if there are any issues. so it can become standard then in svn (real) soon now :) thx and the red line drawing also not work …

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BP cmd regression?

Posted on 2014-01-05, 06:48

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by llm

in DOSBox Development

in DOSBox Development

i think i've found it - seems to be a regression with the bp-cmd or the break point handling i reduced my testcase down to a small screenshot heavy_debug_asm.png it works if i set a breakpoint using the dosbox shown segment/offsets but if i use an segment/offset pair that points to the same 32bit …

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Re: dosbox debugger problems

Posted on 2014-01-04, 15:26

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by llm

in DOSBox Development

in DOSBox Development

so i tested again, this time a heavy debug build - it seems that the debugger does not halt on every setted breakpoint (what i understand should not happen with heavy-debug)? what i've done so far 1. fresh checkout of dosbox-svn (bad idea to use the svn version?) 2. build with vs2010 and following …

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dosbox debugger problems

Posted on 2014-01-03, 15:30

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by llm

in DOSBox Development

in DOSBox Development

i've compile dosbox debugger (not heavy) from svn source with vs2010 - as usual when i need the debugger -disabled C_DYNAMIC_X86 in config.h -use core=normal when i start the game in debug it runs fine when pressing F5, but when i try to set an breakpoint (go to code and press F9) and press then F5 …

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Re: can i get direct access to the linear address-space?

Posted on 2010-10-01, 14:37

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by llm

in DOSBox Development

in DOSBox Development

(any application can move/relocate complete program blocks arbitrarily and you won't ever get some sensible matching to ida) the game i reverse is gentle enough

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Re: can i get direct access to the linear address-space?

Posted on 2010-10-01, 13:51

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by llm

in DOSBox Development

in DOSBox Development

and what is if my cs value changed due to far calls (the program) consists of around 40 segments -> how can i just add a fixed value to the current cs and get to the right place - that can't work, or? for now i can use a "fix" offset which every first loaded program starts (it changes sometimes when …

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Re: can i get direct access to the linear address-space?

Posted on 2010-10-01, 10:48

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by llm

in DOSBox Development

in DOSBox Development

Not sure what exactly you're targeting at i've got global vars that i want to read/write from functions that do not use these variables directly, or through stack parameters so i need a way of getting to the absolute address of it, i've got the relative adress of this global(s) from the …

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Re: can i get direct access to the linear address-space?

Posted on 2010-10-01, 09:42

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by llm

in DOSBox Development

in DOSBox Development

ok i'll checked the mem thing, just low 640kb memory acces, not gate changes, no ems/xms and i will try to find the correct psp by the games exe name (or size,...) - should work thx

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Re: can i get direct access to the linear address-space?

Posted on 2010-10-01, 06:39

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by llm

in DOSBox Development

in DOSBox Development

i will check if any a20gate action is in the game another question: how can i get the "base" address of the game.exe - all my global vars and functions are relative adresses - i need to combine these relatives + base = absolute address - any functions around for information like that?

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Re: can i get direct access to the linear address-space?

Posted on 2010-10-01, 06:17

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by llm

in DOSBox Development

in DOSBox Development

Direct access is not possible, you'll have to go through regular functions. Simple example is if something references video memory, that may be resolved to a *call* to some custom function (ie. no simple pointer). i though that there is still the underlaying memory-space - but i understand the …

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Re: can i get direct access to the linear address-space?

Posted on 2010-09-30, 20:10

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by llm

in DOSBox Development

in DOSBox Development

Please specify what you exactly want: direct access to the low memory (up to 1mb what usually is referenced as "dos memory") that is what i want When exactly do you need the access, are you in pmode (regular application that runs inside dosbox) or are you hacking dosbox itself for this? the 16bit …

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can i get direct access to the linear address-space?

Posted on 2010-09-30, 17:08

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by llm

in DOSBox Development

in DOSBox Development

hi, im currently working on an call-hijacker (something like detours for 16bit calls) for an game-reverse engineering project i want to merge 16bit code running inside of the emulator and combine that with normal 32/64bit code from the ouside (to ease traceing, and the step by step porting) - so its …

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Re: dos extender rtm32 - fileformat of the stub?

Posted on 2010-09-27, 19:46

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by llm

in DOSBox Development

in DOSBox Development

thanks to all i found serveral other rtm extender using games and my extractor is nearly working

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Re: dos extender rtm32 - fileformat of the stub?

Posted on 2010-09-20, 14:44

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by llm

in DOSBox Development

in DOSBox Development

would be also very good to have a list of rtm32 using games then i can use them as a analyse base i know "frontier first encounters" uses rtm32

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Re: dos extender rtm32 - fileformat of the stub?

Posted on 2010-09-19, 07:31

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by llm

in DOSBox Development

in DOSBox Development

>rtm16/rtm32 is the runtime module of the >borland compilers (turbo/borland c/pascal) that is also my info - i was a little bit irritated due to the fact that several game-folder i looked at got an rtm32 AND dos4/gw inside (even the original frontier first encounters demo got both - but only uses …

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dos extender rtm32 - fileformat of the stub?

Posted on 2010-09-18, 18:18

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by llm

in DOSBox Development

in DOSBox Development

hello does anyone know the stub format of rtm32 (i think turbo c dos extender) i want to extract the le/or pe part and think that stub32 is added before the program i've found several tools for dos/4gw based games but non for rtm32 any docs around?

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how to add an patch to the dosbox debugger

Posted on 2010-06-02, 09:00

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by llm

in DOSBox Development

in DOSBox Development

hi all, i've made some small extensions to the dosbox (heavy) debugger that includes and PSP, MCB and Interrupt Vector Table "viewer", some memory overwrite features, and Block-Breakpoints etc. now i thinking about getting my source-code changes into the official repo - but how can i do this …

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dosbox debugger: assembler-code

Posted on 2009-01-25, 11:54

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by llm

in DOSBox Development

in DOSBox Development

what does this [illegal] in the opcode view mean?

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Re: dosbox debugger: DOS_AllocateMemory and DOS_ReadFile

Posted on 2009-01-18, 17:53

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by llm

in DOSBox Development

in DOSBox Development

>Well the trick might be WHERE you put those when all return data is set btw: it seems to work now the memdumpbin looks nearly like the loaded file

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