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jekyll



Joined: 25 May 2004
Posts: 14
jekyll 17 Jun 2004, 01:43
i write stub program:
Code:
format MZ
entry main:start

segment main use16

start:
    


when i try to make PE with this stub compiler crashes.

fasm 1.52
Post 17 Jun 2004, 01:43
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pelaillo
Missing in inaction


Joined: 19 Jun 2003
Posts: 878
Location: Colombia
pelaillo 17 Jun 2004, 12:56
You have created a multisegment exe (With MZ header) and PE is expecting a plain binary file (org 100) without exe header as stub.

Maybe you could do a test editing manually the first MZ header to point to the PE header.
Post 17 Jun 2004, 12:56
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Tomasz Grysztar



Joined: 16 Jun 2003
Posts: 8357
Location: Kraków, Poland
Tomasz Grysztar 17 Jun 2004, 13:05
pelaillo wrote:
You have created a multisegment exe (With MZ header) and PE is expecting a plain binary file (org 100) without exe header as stub.

No, it generally accepts the MZ programs, too (and this is even the recommended option). I have to look into that bug.
Post 17 Jun 2004, 13:05
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Tomasz Grysztar



Joined: 16 Jun 2003
Posts: 8357
Location: Kraków, Poland
Tomasz Grysztar 18 Jun 2004, 10:21
OK, fixed it for the next release. If you want to quickly fix it yourself in current release, find this piece of code in FORMATS.INC (for fasm 1.52 it should be around line 551):
Code:
        movzx   ecx,word [esi+4]
        dec     ecx
        shl     ecx,9
        sub     ecx,eax
        movzx   eax,word [esi+2]
        mov     edx,edi
        add     ecx,eax
        push    ecx
        dec     ecx
        shr     ecx,3
        inc     ecx
        shl     ecx,1
        lea     eax,[edi+ecx*4]
        cmp     edi,[display_buffer]
        jae     out_of_memory
        xor     eax,eax
        rep     stos dword [edi]
        pop     ecx
        call    read
        call    close    

add the "jz read_stub_code" jump and "read_stub_code" label, so it becomes:
Code:
        movzx   ecx,word [esi+4]
        dec     ecx
        shl     ecx,9
        sub     ecx,eax
        movzx   eax,word [esi+2]
        mov     edx,edi
        add     ecx,eax
        jz      read_stub_code
        push    ecx
        dec     ecx
        shr     ecx,3
        inc     ecx
        shl     ecx,1
        lea     eax,[edi+ecx*4]
        cmp     edi,[display_buffer]
        jae     out_of_memory
        xor     eax,eax
        rep     stos dword [edi]
        pop     ecx
     read_stub_code:
        call    read
        call    close    
Post 18 Jun 2004, 10:21
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jekyll



Joined: 25 May 2004
Posts: 14
jekyll 21 Jun 2004, 14:57
Great! Thank you Privalov. :D
Post 21 Jun 2004, 14:57
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