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Path: utzoo!watmath!clyde!burl!ulysses!allegra!princeton!wei
From: wei@princeton.UUCP (P Wei)
Newsgroups: net.micro.pc,net.lang.pascal
Subject: what might go wrong in these code (TURBO PASCAL)???
Message-ID: <1170@princeton.UUCP>
Date: Thu, 21-Nov-85 13:34:31 EST
Article-I.D.: princeto.1170
Posted: Thu Nov 21 13:34:31 1985
Date-Received: Sat, 23-Nov-85 01:32:54 EST
Distribution: net
Organization: Princeton University EECS Dept
Lines: 29
Xref: watmath net.micro.pc:5948 net.lang.pascal:384

program test;
var
  a,b : integer;
procedure call_int7e(a : integer; var b : integer);
begin inline($b8/$01/$cd/$7e); end;  {mov ax,01
				      int 7eh}
begin
   a := 0;
   b := 0;
   call_int7e(a,b);
   .
   .
   .
When I call call_int in the main program, I suppose that the TURBO first pushes
the value of a onto the stack, and then pushes the pointer of b onto the stack,
finally pushes the return address on top of the stack.
When the program reaches the inline code in call_int7e, it will transfer
control to the interrupt routine 7eh with a parameter in ax register.
When the interrupt routine 7eh is reached, the stack will look like :
sp----> IP        (low address)
	CS
	flags
	return address
	offset b
	segment b
	value of a     (high address) and SS is the one set by TURBO.
Can anyone tell me if there is anything wrong ?
HP Wei  (wei@princeton)