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From: "ferrary" <ferrary AT itelefonica DOT com DOT br>
To: "djgpp" <djgpp AT delorie DOT com>
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Reply-To: djgpp AT delorie DOT com

what is wrong with this code:

Nasm program wich i link to DJGPP (keyboard interrupt handler)
*******************
[Bits 32]


global _ManTCL,_IniTcl,_FimTcl,_Teclas
extern ___djgpp_base_address

[section .data]

IntTecladoAnt times 6 db 0
IntTecladoNovo times 6 db 0
_Teclas times 127 db 0
TeclasTam:

[section .text]

Inicio:



;****************************************************************************
_IniTcl:

push ebp
mov ebp,esp

mov [IntTecladoNovo+2],dword _ManTcl
mov [IntTecladoNovo],cs

mov ax,0204h
mov bl,09h
int 31h
jc near Erro

mov [IntTecladoAnt],cx
mov [IntTecladoAnt],edx


mov ax,0205h
mov bl,09h
mov cx,[IntTecladoNovo]
mov edx,[IntTecladoNovo+2]
int 31h
jc near Erro

mov eax, (TeclasTam - IntTecladoAnt) ;sizeof timer_data
mov esi, eax
shr esi, 16 ;=20
mov edi, eax
and edi, 0ffffh ; si:di =3D length of region to lock in bytes
lea ebx, [ds:IntTecladoAnt]
lea ecx, [ds:IntTecladoAnt]
shr ebx, 16
and ecx, 0ffffh ; bx:cx =3D start of linear address to lock
add cx, word [___djgpp_base_address]
adc bx, word [___djgpp_base_address+2]
mov eax, 0600h ; DPMI lock address function
int 31h ; call dpmi
jc Erro

lea eax, [cs:FimManTcl]
lea ecx, [cs:Inicio]
sub eax, ecx
inc eax ; EAX =3D size of timer interrupt handler
mov esi, eax
shr esi, 16 ;=20
mov edi, eax
and edi, 0ffffh ; si:di =3D length of region to lock in bytes
lea ebx, [cs:Inicio]
lea ecx, [cs:Inicio]
shr ebx, 16
and ecx, 0ffffh ; bx:cx =3D start of linear address to lock
add cx, word [___djgpp_base_address]
adc bx, word [___djgpp_base_address+2]
mov eax, 0600h ; DPMI lock address function
int 31h ; call dpmi
jc Erro

xor eax,eax

jmp Fim

Erro:

mov eax,01h

Fim:
pop ebp
ret

;****************************************************************************


;****************************************************************************
_FimTcl:

push ebp
mov ebp,esp

mov ax,0205h
mov bl,09h
mov cx,[IntTecladoAnt]
mov edx,[IntTecladoAnt+2]
int 31h



pop ebp
ret

;****************************************************************************

;****************************************************************************
_ManTcl:
cli
pusha


xor ecx,ecx
xor ebx, ebx
in al,60h
mov cl,al
cmp cl,128
jbe Incrementa
sub cl, 128
jmp Continua
Incrementa:
inc bl
Continua:
in al,61h
or al,82h
out 61h,al
and al,7Fh
out 61h,al

mov edi,_Teclas
add edi,ecx
mov [edi],bl

FimMan:

mov al,20h
out 20h,al

popa
sti
FimManTcl:

iretd
;;
;****************************************************************************


Djgpp program

****************************************
#include <conio.h>
#include <stdio.h>
#include <stdlib.h>

extern int volatile IniTcl();
extern void volatile FimTcl();
extern void volatile ManTcl();
extern unsigned char Teclas[127];


int x,y,i;

int main()
{

if (IniTcl() != 0)
{
printf("Erro ao instalar o teclado");
exit(0);
}


while (Teclas[1] != 1)
{
if ( (Teclas[80]) && (Teclas[75]) )
{
printf("%d %d",Teclas[80],Teclas[75]);
// break;with this line the program works fine
}

}


FimTcl();


return 0;

}

***********************************

This works fine under windows98, but in windows XP this works fine for
some seconds and then crash with message:


Exiting due to signal SIGSEGV

General Protection Fault at eip=00001798
eax=73791332 ebx=00000000 ecx=00000060 edx=4e490213 esi=000100f4
edi=0000b73c
ebp=000008de esp=00000fc8 program=F:\DJGPP\PROGRA~1\TESTE.EXE
cs: sel=01a7 base=02980000 limit=0009ffff
ds: sel=0000
es: sel=0000
fs: sel=0000
gs: sel=0000
ss: sel=016f base=02970000 limit=00000fff
App stack: [0008fb90..0000fb90] Exceptn stack: [0000faf0..0000dbb0]

Call frame traceback EIPs:
0x00001798

F:\DJGPP\PROGRA~1>

*******************************
The problems occurs because of a sucessive calls to printf... If I
take off the printf of the loop of while this works without
problems...... I don't have idea what's happen.