Mail Archives: djgpp/2005/06/30/13:48:00
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Date: | Thu, 30 Jun 2005 14:46:45 -0300
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From: | "ferrary" <ferrary AT itelefonica DOT com DOT br>
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To: | "djgpp" <djgpp AT delorie DOT com>
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Reply-To: | djgpp AT delorie DOT com
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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.
- Raw text -