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9.0

Getting opcode sldt to work

Asked by MvanderKooij in Assembly Programming Language, Delphi Programming

Tags: Delphi, assembly, sldt

I'm trying to get the Get_ldtr_base to work. I've copied the code from a C++ sample:

unsigned long
get_idt_base (void)
{
      unsigned char      idtr[6];
      unsigned long      idt      = 0;

      _asm sidt idtr
      idt = *((unsigned long *)&idtr[2]);
      
      return (idt);
}

unsigned long
get_ldtr_base (void)
{
      unsigned char   ldtr[5] = "\xef\xbe\xad\xde";
      unsigned long   ldt                  = 0;

      _asm sldt ldtr
      ldt = *((unsigned long *)&ldtr[0]);

      return (ldt);
}

but Delphi can not compile the "sldt ldtr" opcode. It turns out that Delphi wants to create a 16 bit register opcode. How can i fool delphi to get the sldt for me?
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function Get_idt_base: Cardinal;
var
  idtr: array[0..5] of Byte;
begin
  asm
    sidt idtr
  end;
  Result := pCardinal(@idtr[2])^;
end;
 
function Get_ldtr_base: Cardinal;
var
  ldtr: array[0..4] of Byte;
begin
  ldtr[0] := $ef;
  ldtr[1] := $be;
  ldtr[2] := $ad;
  ldtr[3] := $de;
  ldtr[4] := $00;
 
  asm
    sldt ldtr
  end;
  Result := pCardinal(@ldtr[0])^;
end;
[+][-]09/30/09 04:37 AM, ID: 25457419Expert Comment

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[+][-]09/30/09 05:53 AM, ID: 25458232Accepted Solution

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About this solution

Zones: Assembly Programming Language, Delphi Programming
Tags: Delphi, assembly, sldt
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Solution Provided By: Hypo
Participating Experts: 2
Solution Grade: A
 
[+][-]09/30/09 06:03 AM, ID: 25458344Expert Comment

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[+][-]10/01/09 11:48 PM, ID: 25475581Author Comment

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