Atempt (unsuccessful) to make FASM compiler as procedure.

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JohnFound

Joined: 16 Jun 2003
Posts: 3499
Location: Bulgaria

JohnFound 10 Sep 2003, 04:24

Hi Privalov.

In recent version of FASMW, compiler itself runs in separate thread.
After finishing compilation, the thread is terminated not via "ret" instruction but with "invoke ExitThread, xxx"
So, I am trying to make it to be simple procedure ending with "ret". But the problem is that on the exit of the procedure illegal stack fault occurs.

Code:

FRESH caused a stack fault in module FRESH.EXE at 0157:004022be.
Registers:
EAX=00000001 CS=0157 EIP=004022be EFLGS=00010202
EBX=00000002 SS=015f ESP=0055fb10 EBP=00000000
ECX=00000014 DS=015f ESI=00404441 FS=3477
EDX=004022bb ES=015f EDI=0000027e GS=0000
Bytes at CS:EIP:
c9 c2 04 00 56 57 e8 52 00 00 00 68 00 00 00 80 
Stack dump:
00418beb 00431d88 00670000 004043b8 00402130 0055fd16 0052f038 00401478 0055fb3c 004152b9 00418beb 0055fb68 0041cd47 0000701a 00000000 0052f038

Privalov, do you think this is my fault somewhere in the implementation, or it is some general FASM requirement, that it must run in separate thread?

Regards.

10 Sep 2003, 04:24

scientica
Retired moderator

Joined: 16 Jun 2003
Posts: 689
Location: Linköping, Sweden

scientica 10 Sep 2003, 04:38

JohnFound wrote:

In recent version of FASMW, compiler itself runs in separate thread.
After finishing compilation, the thread is terminated not via "ret" instruction but with "invoke ExitThread, xxx"

Wouldn't it be possibÃ¶le to change the return address to a place where it "returns" to a ExitThread call?

_________________
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10 Sep 2003, 04:38

Tomasz Grysztar

Joined: 16 Jun 2003
Posts: 8353
Location: Kraków, Poland

Tomasz Grysztar 10 Sep 2003, 08:45

You have to save and restore stack frame in order to get it working with ret.

10 Sep 2003, 08:45

JohnFound

Joined: 16 Jun 2003
Posts: 3499
Location: Bulgaria

JohnFound 10 Sep 2003, 08:49

Privalov wrote:

You have to save and restore stack frame in order to get it working with ret.

I am using standard enter/return macroses. Do you mean something similar?

10 Sep 2003, 08:49

Tomasz Grysztar

Joined: 16 Jun 2003
Posts: 8353
Location: Kraków, Poland

Tomasz Grysztar 10 Sep 2003, 09:39

No, you have to store initial ESP in some variable and restore it before using ret instruction, because position of ESP register on calling the exit_program label is indetermined.

10 Sep 2003, 09:39

JohnFound

Joined: 16 Jun 2003
Posts: 3499
Location: Bulgaria

JohnFound 10 Sep 2003, 10:04

Thanks, it works now. Smile

10 Sep 2003, 10:04

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