Why 64 bit code crashes?

[Nordwind64]

I tried this code as 64 bit using JWasm/Polink:

Code Select Expand


option casemap:none, frame:auto

  WINVER equ 500h
  WIN32_LEAN_AND_MEAN equ 1

include windows.inc

includelib kernel32.lib
includelib user32.lib

  .data
 
    p1  db  "Proc 1",0
    p2  db  "Proc 2",0
 
.code

  ;=============================================================================================================

  Pr1 proc

    invoke MessageBox,0, addr p1, 0, MB_OK
    ret
   
  Pr1 endp


  Pr2 proc

    invoke Pr1
    invoke MessageBox,0, addr p2, 0, MB_OK
    ret

  Pr2 endp
 
  ;=============================================================================================================

 
  WinMainCRTStartup proc
 
    invoke Pr2
    invoke ExitProcess, 0
 
  WinMainCRTStartup endp
 
end WinMainCRTStartup



The exe were build, but no Messagebox appears and the program crashes.
What's my error?

If I use:

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  WinMainCRTStartup proc
 
    invoke Pr1
    invoke ExitProcess, 0
 
  WinMainCRTStartup endp

One Messagebox appears and program end without error.
Need help.

Best regards,
Nordwind

[qWord]

the PROC directive does not generate a stack frame until the FRAME keyword is used or local variables are declared -> the stack is not correctly aligned when a call (invoke) occurs.

Code Select Expand


...
Pr1 proc frame
...-
Pr1 proc frame
...
WinMainCRTStartup proc frame
...


qWord

[Nordwind64]

You are right! I tested the FRAME keyword in my procs, but forgot it for the proc WinMainCRTStartup.
And I tought, if I set the option frame:auto, jwasm will build all proc automatically with the FRAME keyword... my error.

You helped me alot, thank you qWord!  :U

Best regards,
Nordwind