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From: Cesar Rabak <csrabak AT yahoo DOT com DOT br>
Newsgroups: comp.os.msdos.djgpp
Subject: Re: calling a RM function which is placed below 1 MB
Date: Thu, 24 Jul 2008 08:58:22 -0300
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Eph escreveu:
[snipped]

> The Stack configuration is ok? I'm not sure about the struct and the
> order I must place the params. But the comments say how it should be.
> param1 must be at bp[14] and must be a DWORD PTR.
> param2 must be at bp[10] and must be a DWORD PTR.
> param3 must be at bp[06] and must be a DWORD PTR.
> 
> param1 - 3 are allocated like this:
> 
> typedef struct MEM_INFO {
> 	void *data;
> 	int selector;
> 	int segment;
> 	unsigned long base;
> 	int size;
> };
> 
To ascertain it for yourself, compile and run the following snippet:

#include <stdio.h>
#include <stddef.h>

typedef struct MEM_INFO {
	void *data;
	int selector;
	int segment;
	unsigned long base;
	int size;
};

int
main(void)
{
     printf("Offset of data: %u\nselector: %u\nsegment: %u\nbase: 
%u\nsize: %u\n", offsetof(struct MEM_INFO,data), offsetof(struct 
MEM_INFO,selector), offsetof(struct MEM_INFO,segment), offsetof(struct 
MEM_INFO,base), offsetof(struct MEM_INFO,size));

     return 0;
}

HTH