IDT exception 6

[slacker]

i was wondering if anyone else had the same problem as me. when i load IDT, remap PICs, and enable interrupts i always get this error (exception 6: invalid opcode). i have been workin on this problem for about a week now and if anybody knows how to fix this or what it is caused by please tell me. thank you

[slacker]

ok i decided to start over with my IDT cause i had so many problems. how does this code look?

Code: Select all

[bits 32]             ;workin in pmode
[global setupIDT]     ;for linker to recognize
[extern _main]

;---variables---
ISR0     dd ISRaddr000
ISR1     dd ISRaddr001
ISR2     dd ISRaddr002
ISR3     dd ISRaddr003
ISR4     dd ISRaddr004
ISR5     dd ISRaddr005
ISR6     dd ISRaddr006
ISR7     dd ISRaddr007
ISR8     dd ISRaddr008
ISR9     dd ISRaddr009
ISR10    dd ISRaddr00A
ISR11    dd ISRaddr00B
ISR12    dd ISRaddr00C
ISR13    dd ISRaddr00D
ISR14    dd ISRaddr00E

curISR DD 0x00
curDES DD 0x00

;---IDT register information---
IDTpntr:
IDTlim   dw IDTend - IDT - 1     ;limit
IDTbase  dd IDT                  ;base

;---IDT---
IDT:

;---descriptor format---
%rep 256
dw 0x00  ;low offset
dw 0x08  ;code selector
db 0x00  ;always zero
db 0x8E  ;descriptor settings
dw 0x00  ;high offset
%endrep
IDTend:

;---split 32bit addr into 2 words---
fixOFFSETS:
MOV ECX, 15
doIT:
call zeroREGS
MOV EAX, [curISR]
MOV EBX, [curDES]
PUSH EAX
AND EAX, 0xFFFF
MOV word [EBX], AX
POP EAX
INC EBX
INC EBX
INC EBX
INC EBX
INC EBX
SHR EAX, 16
MOV word [EBX], AX
INC EBX
INC EBX
MOV [curDES], EBX
INC dword [curISR]
loop doIT
ret

zeroREGS:
XOR EAX, EAX
XOR EBX, EBX
ret

;---start code---
setupIDT:
MOV dword [curISR], ISR0
MOV dword [curDES], IDT
call fixOFFSETS
lidt [IDTpntr]
sti
call _main

endit:
jmp endit

;---ISRs---
ISRaddr000:
PUSHA
PUSH DS
PUSH ES
PUSH FS
PUSH GS

POP GS
POP FS
POP ES
POP DS
POPA
iret

ISRaddr001:
PUSHA
PUSH DS
PUSH ES
PUSH FS
PUSH GS

POP GS
POP FS
POP ES
POP DS
POPA
iret

ISRaddr002:
PUSHA
PUSH DS
PUSH ES
PUSH FS
PUSH GS

POP GS
POP FS
POP ES
POP DS
POPA
iret

ISRaddr003:
PUSHA
PUSH DS
PUSH ES
PUSH FS
PUSH GS

POP GS
POP FS
POP ES
POP DS
POPA
iret

ISRaddr004:
PUSHA
PUSH DS
PUSH ES
PUSH FS
PUSH GS

POP GS
POP FS
POP ES
POP DS
POPA
iret

ISRaddr005:
PUSHA
PUSH DS
PUSH ES
PUSH FS
PUSH GS

POP GS
POP FS
POP ES
POP DS
POPA
iret

ISRaddr006:
PUSHA
PUSH DS
PUSH ES
PUSH FS
PUSH GS

POP GS
POP FS
POP ES
POP DS
POPA
iret

ISRaddr007:
PUSHA
PUSH DS
PUSH ES
PUSH FS
PUSH GS

POP GS
POP FS
POP ES
POP DS
POPA
iret

ISRaddr008:
PUSHA
PUSH DS
PUSH ES
PUSH FS
PUSH GS

POP GS
POP FS
POP ES
POP DS
POPA
iret

ISRaddr009:
PUSHA
PUSH DS
PUSH ES
PUSH FS
PUSH GS

POP GS
POP FS
POP ES
POP DS
POPA
iret

ISRaddr00A:
PUSHA
PUSH DS
PUSH ES
PUSH FS
PUSH GS

POP GS
POP FS
POP ES
POP DS
POPA
iret

ISRaddr00B:
PUSHA
PUSH DS
PUSH ES
PUSH FS
PUSH GS

POP GS
POP FS
POP ES
POP DS
POPA
iret

ISRaddr00C:
PUSHA
PUSH DS
PUSH ES
PUSH FS
PUSH GS

POP GS
POP FS
POP ES
POP DS
POPA
iret

ISRaddr00D:
PUSHA
PUSH DS
PUSH ES
PUSH FS
PUSH GS

POP GS
POP FS
POP ES
POP DS
POPA
iret

ISRaddr00E:
PUSHA
PUSH DS
PUSH ES
PUSH FS
PUSH GS

POP GS
POP FS
POP ES
POP DS
POPA
iret

[slacker]

find the problem, win a prize

[distantvoices]

starting from which index do you patch the entries of the idt?

Do you increment the current adress of the idt by 8 to point to the next idt entry? I can't find it or I am blind. You have to crawl through your IDT starting from the beginning and by each loop increment the adress pointing into it by 8 bytes.

When you do this in C, it's some what more bytes in your binary, but it is much more comprehensive - and you easy can use pointer arithmetics.

[slacker]

ok i found one of the problems i didnt increment EBX enough so the alignment was off but it still doesnt work.
i just added an extra INC EBX in there with all those other INC EBX commands. btw "BEYOND INFINITY", when i INC EBX im moving down a single byte in my IDT.