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Old 09-18-2008, 03:32 PM   #1
tanoatlq
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Registered: Mar 2007
Posts: 157

Rep: Reputation: 30
segmentation fault in assembly code


Hello,
I start to use nasm for a little bit of code with SDL libraries,
but now that I start to test a little bit of code, I get
a segmentation fault. This piece of code should only call
SDL_MapRGB(). The video was initialized in c main program.





; background is wheat

%define BACKGROUND_RED 0xf5
%define BACKGROUND_GREEN 0xde
%define BACKGROUND_BLUE 0xb3

; void demo (SDL_Surface *screen, SDL_PixelFormat *format, Uint8 bpp, int width, int height, Uint16 pitch, void *pixels);

%define pixels (ebp + 8)
%define pitch (ebp + 12)
%define height (ebp + 16)
%define width (ebp + 20)
%define bpp (ebp + 24)
%define format (ebp + 28)
%define screen (ebp + 32)

segment .text
global demo
extern SDL_MapRGB

; local variables

%define background (ebp - 4)

demo: enter 4,0

; Uint32 SDL_MapRGB (SDL_PixelFormat *, Uint8 r, Uint8 g, Uint8 b);

push dword BACKGROUND_BLUE
push dword BACKGROUND_GREEN
push dword BACKGROUND_RED
push dword [format]
call SDL_MapRGB
add esp, 16
mov [background], eax

leave
ret



Any suspect?
 
Old 09-19-2008, 09:26 AM   #2
tanoatlq
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Registered: Mar 2007
Posts: 157

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Rep: Reputation: 30
Wrong defines. They should be in reverse order. :-)
 
  


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