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Index > Main > 32bit asm code in 16bit c++ compiler?

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cylo



Joined: 06 Nov 2004
Posts: 20
cylo
Hello!

A short generall question: Is it possible to compile a 32bit asm code into a object or so and include it in my 16bit borland c++ 3.1 dos compiler?
Post 15 Feb 2005, 17:18
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Matrix



Joined: 04 Sep 2004
Posts: 1171
Location: Overflow
Matrix
yes Smile
and you can use 32bit instructions too, in 16 bit mode
for example db $66; stosb; means stosd
only a prefix is the difference
but in 32 bit mode, you have that prefix on the 16 bit instructions
Post 15 Feb 2005, 17:58
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cylo



Joined: 06 Nov 2004
Posts: 20
cylo
my prob is that i have a asm code for my "vesa refresh rate tool" but it uses extended register which are not supported in borland c++ 3.1. inline asm

did i mention i am a asm noob? Laughing
Post 15 Feb 2005, 18:31
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vid
Verbosity in development


Joined: 05 Sep 2003
Posts: 7105
Location: Slovakia
vid
well there is one more problem. It works with db 66h before instruction (i have been using it too under turbo pascal), but there are several problems:
1. don't forgat to check for 386+ processor
2. If you use constants (immediates), they must be extended to 32 bits:

16 bit code:
mov bx,3210h is ?? 10 32
mov ebx,76543210h is 66 ?? 10 32 54 76 (?? is same as in mov bx, i can't remember now)
so as you see, you also have to add two bytes of constant, so
you need
;mov ebx,765433210h
db 66h
mov bx,3210h
dw 7654h

you can also extend addressing to 32bit with 67h prefix but that is a little bigger problem.
Post 15 Feb 2005, 18:46
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cylo



Joined: 06 Nov 2004
Posts: 20
cylo
havy stuff for me Embarassed

okay.. lets say i want to do this:

Code:
mov ecx, 0x35714000 (requested pixel clock in hz)    


how do i solve this if my compiler does not understand ecx?
Post 17 Feb 2005, 13:59
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JohnFound



Joined: 16 Jun 2003
Posts: 3502
Location: Bulgaria
JohnFound
The most common and troubles-free answers are:
1. Get new compiler... there are many free 32bit compilers.
2. Waste all these fake HLL compilers and use FASM for writing whole programs - beleave me this is not so awfully as it looks. Smile
Actually the natural way of a programmer is:
Code:
interpreted HLL -> compiled HLL -> fashionable HLL -> any HLL with inline assembler -> more inline ASM -> MASM -> FASM    


Of course, there are exceptions - some of the programmers begin directly with compiled HLL, some of them never reach the FASM level...it is a matter of skills you know. Also, these days, the smartest one simply skip MASM level. Very Happy

Regards.
Post 17 Feb 2005, 14:17
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cylo



Joined: 06 Nov 2004
Posts: 20
cylo
i would if i could... but i have to go the hard way. Mad
Post 17 Feb 2005, 15:55
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f0dder



Joined: 19 Feb 2004
Posts: 3170
Location: Denmark
f0dder
You can use FASM to assemble the VESA code, and link with your C project. A (IMHO better) solution would be getting the microsoft visual c++ 2003 toolkit (which is free), produce PE executables, and use a dos extender like WDOSX to have it run under dos.
Post 17 Feb 2005, 17:48
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cylo



Joined: 06 Nov 2004
Posts: 20
cylo
no, i am bound to borland c++ 3.1 Sad

Another short question:

how can i print out the value of a register to dos screen?
Post 21 Feb 2005, 13:55
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Vortex



Joined: 17 Jun 2003
Posts: 318
Vortex
Quote:
Also, these days, the smartest one simply skip MASM level.


John, every good man is deserving a chance. Smile

_________________
Code it... That's all...
Post 22 Feb 2005, 11:00
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