compiling troubles : part 1

kerim · **Posted:** Mon Jan 27, 2003 5:42 am

I have a problem when compiling my kernel with NASM. The problem is related to interrupt vector routines (SetVector, GetVector).

-- GetVector --
...
mov bx, es:[di] ; put low byte in BX
mov ax, es:[di]+2 ; put high byte in AX
...

-- SetVector --
...
mov word es:[al*4], dx ; put low byte first
mov es:[al*4+2], ds ; put high byte then
...

For these 4 lines, compiler says :

intvec.inc:25: error: invalid combination of opcode and operands
intvec.inc:26: error: invalid combination of opcode and operands
intvec.inc:46: error: invalid combination of opcode and operands
intvec.inc:47: error: invalid combination of opcode and operands

Please H E L P :'(

Pype.Clicker · **Posted:** Mon Jan 27, 2003 6:08 am

your syntax for get vector is wrong.

Code:

  mov bx, [es:di]    
    mov ax, [es:di+2]  

Code:

mov word es:[al*4], dx ; put low byte first

you cannot use the "*4" feature with non-32 registers. only
[es:eax*4] will be allowed.

Code:

mov es:[al*4+2], ds ; put high byte then

same as above, plus you cannot have mov <mem>,ds. You should expand it into "mov <reg>,ds ; mov <mem>,<reg>".

kerim · **Posted:** Mon Jan 27, 2003 7:47 am

maybe I should use

shl al, 2 ???

kerim · **Posted:** Mon Jan 27, 2003 9:47 pm

thank you ! the problem is solved !

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compiling troubles : part 1

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