Structs in stack

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Mentol

Joined: 08 Jun 2006
Posts: 7

Mentol 12 Jun 2006, 17:59

Hi, my problem>

i have local struct in stack:

Code:

proc Test
  locals
    s_a : sockaddr_in
  endl
 . . .
endp

but, i can't use struct items (s_a.sin_port, s_a.sin_family, etc) because structure address is EBP-based (ebp+10, for example) NOT absolute! (0x00401020 for example).
if this variable was global, i can use:

Code:

mov s_a.sin_port, 0

but with ebp-based address i cant use this construction
i see (forgotten place =)) that fasm supports anything about this (что-то типа такого):

Code:

lea eax, [s_a],
mov (sockaddr_in)eax.sin_port, 0

HELP!

12 Jun 2006, 17:59

Mentol

Joined: 08 Jun 2006
Posts: 7

Mentol 12 Jun 2006, 18:03

i got the problem solved Very Happy

Code:

        lea   eax, [s_a]
        mov  [eax+sockaddr_in.sin_port], 1

12 Jun 2006, 18:03

jbojarczuk

Joined: 21 Jun 2006
Posts: 27

jbojarczuk 21 Jun 2006, 04:32

Have you tried using Privalov's macros? They work, create a faster code (you don't have the register pressure of using eax, you may use ebp directly), and allow you to use

mov s_a.sin_port, 0

.

21 Jun 2006, 04:32

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