37 lines
779 B
NASM
37 lines
779 B
NASM
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; echo.asm
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; Demo: C und Assembler verlinken
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; HS Emden/Leer | C.Koch
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; 31.05.2013 initial version
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; 11.12.2014 local variables added
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; **** Code-Segment ****
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section .text
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global _echo
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_echo:
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push ebp ; neuer Stackframe: BasePointer retten
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mov ebp,esp ; Stackpointer zum neuen BasePointer machen
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sub esp, 4 ; ?
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mov [ebp-4], word 1
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mov eax,0 ; Rueckgabewert zur C-Funktion: EAX-Register
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add ax, word [foo] ; ?
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add ax, word [ebp+8] ; Parameter holen
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add ax, word [ebp-4] ; ?
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mov esp, ebp ; ?
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pop ebp ; BP wiederherstellen
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ret ; um die Uebergabeparameter kuemmert sich
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; das rufende Programm (add esp, 16)
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; **** Daten-Segment ****
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section .data
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; GLOBALE Variable anlegen und initialisieren.
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; C-Beispiel: short foo = 0;
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foo dw 2
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