From:	"lewi9908" <lewi9908 AT ghc DOT ctc DOT edu>
Newsgroups:	comp.os.msdos.djgpp
Subject:	Re: AT&T inline asm in DJGPP...
Date:	Wed, 4 Dec 2002 18:17:10 -0800
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To:	djgpp AT delorie DOT com
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Reply-To:	djgpp AT delorie DOT com

Ok got the text to show up however I ran in to a problem moving the text
round the consol screen...

But first here is the current code(I got asm code by compling the C version
the screen writting code and the looked at the .s file and change the AT&T
asm to Intel)...

The ASM code
[BITS 32]

GLOBAL _OutputText

SECTION .text

_OutputText:
 push ebp
 mov ebp,esp

 mov edx, 0xb8000
 add edx, 0x4;[ebp+0x12]
 mov ecx, [ebp+0x8]
 cmp byte [ebp+0x8], 0x00
 je L4

L5:
 mov al, byte [ecx]
 mov byte [edx], al
 inc ecx
 inc edx
 mov byte [edx], 0x4f
 inc edx
 cmp byte [ecx], 0x00
 jne L5

L4:
 mov esp,ebp
 pop ebp
 retn

The C code...
extern "C" void OutputText(char* pOutStr, int iVideoMemIndex);

int main()
{
    OutputText("Hello, world!", 4);         //Start writting on the third
char in vid mem...
    return 0;
}

Now the problem is at...

_OutputText:
 push ebp
 mov ebp,esp

 mov edx, 0xb8000
 ---> add edx, 0x4;[ebp+0x12]       ;Should get 0xb8004 using the
[ebp+0x12]...
...

I can add 0x4 as a constant but I try to add the value of the 2nd funtion
param [ebp+0x12] and the text only starts at 0xb8000 the 1st char in the
consol screen...

Can you explain what value is at [ebp+0x12]? Is it a pointer or 0x4 because
of in this case "OutputText("Hello, world!", 4);". I think it is 0x4...

A lot closer now...

Any more help...

- Raw text -