Mail Archives: djgpp/1998/01/09/21:31:48
Hmm.. after my numerous posts on bugs and stuff I've decided that
it must be NASM that's screwing my library (or my use of NASM).
My library is a hulking beast like allegro (only about 45% of that
functionality yet though) which is making debugging difficult. I
would wager that I have numberous bugs which are causing weird errors.
Here is the way I am using nasm:
-I only preserve ds when I use it. I often clobber es and all offset
regs
-I store ebp and mov ebp, esp to reference the function's args if
I've messed around on the stack I mov esp, ebp at the end before
popping ebp
-does using ebp with debug info on cause any worries?
-I have MIDAS sound system running in the background. Is this a
problem?
Here is a sample procedure to write to the LFB. I've gotten myself
a selector to the LFB. I know this function causes problems so
what's wrong???
;
ÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄ
; gfxSendToLFB : Sends the data pointed to to the lfb
;
; void gfxSendToLFB(UCHAR *data, int length);
;
ÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄ
;_gfxSendToLFB:
; push ebp
; mov ebp, esp
; push dword [_vidLFB_Seg] ; es = LFB segment
; pop es ;
; cld ;
; xor edi, edi ; edi = 0
; mov esi, [ebp + 8] ; esi = data
; mov edx, [ebp + 12] ; edx = count
; mov ecx, edx ; ecx = count/4
; shr ecx, 2 ;
; rep movsd ; copy data
; mov ecx, edx ; ecx = count mod 4
; and ecx, 3 ;
; rep movsb ; copy left over data
;
; mov esp, ebp
; pop ebp
; ret
And another thing, I'm using NASM 0.97 and when I do [SECTION .text
ALIGN=4]
I get an error: standard coff format does not support section alignment
the examples from djppasm.doc all have this error. Has something changed
in a subsequent version of NASM?
hmm.. I know I've got a lot of problems there but I'm really starting to
get
annoyed with this...
-Rich
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| Richard Nichols | Inspire Media (Demos/Games) |
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