mirror of
https://github.com/corkami/pics
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Ange Albertini
155 lines
3.0 KiB
NASM
155 lines
3.0 KiB
NASM
; a simple Java "Hello World" CLASS in assembly
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; build with:
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; yasm -o simple.class simple_class.asm
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; Ange Albertini, BSD Licence 2012-2013
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;*******************************************************************************
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; macros
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%macro GETSTATIC 1
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db 0b2h
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_dw %1
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%endmacro
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%macro LDC 1
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db 012h
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db %1
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%endmacro
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%macro INVOKEVIRTUAL 1
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db 0b6h
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_dw %1
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%endmacro
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%macro RETURN 0
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db 0b1h
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%endmacro
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%macro _dd 1
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db (%1 >> 8 * 3) & 0ffh
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db (%1 >> 8 * 2) & 0ffh
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db (%1 >> 8 * 1) & 0ffh
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db (%1 >> 8 * 0) & 0ffh
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%endmacro
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%macro _dw 1
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db (%1 >> 8 * 1) & 0ffh
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db (%1 >> 8 * 0) & 0ffh
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%endmacro
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%macro lbuffer 1
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_dw %%end - 1 -$
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db %1
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%%end:
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%endmacro
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%macro utf8 1
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db 1
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lbuffer %1
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%endmacro
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%macro nat 2
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db 0ch
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_dw %1
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_dw %2
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%endmacro
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%macro string 1
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db 8
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_dw %1
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%endmacro
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%macro classref 1
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db 7
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_dw %1
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%endmacro
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%macro fieldref 2
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db 9
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_dw %1
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_dw %2
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%endmacro
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%macro metref 2
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db 0ah
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_dw %1
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_dw %2
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%endmacro
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ACC_PUBLIC equ 1
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ACC_STATIC equ 8
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;*******************************************************************************
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; header
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_dd 0CAFEBABEh ; signature
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_dw 3 ; major version
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_dw 2dh ; minor version
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;*******************************************************************************
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; constant pool
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_dw 22 ;constant pool count
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;<always empty> ; 00
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classref 2 ; 01
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utf8 'simple' ; 02
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classref 4 ; 03
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utf8 'java/lang/Object' ; 04
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utf8 'main' ; 05
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utf8 'Code' ; 06
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fieldref 8, 10 ; 07
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classref 9 ; 08
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utf8 'java/lang/System' ; 09
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nat 11, 12 ; 10
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utf8 'out' ; 11
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utf8 'Ljava/io/PrintStream;' ; 12
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string 14 ; 13
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utf8 'Hello World!' ; 14
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metref 16, 18 ; 15
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classref 17 ; 16
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utf8 'java/io/PrintStream' ; 17
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nat 19, 20 ; 18
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utf8 'println' ; 19
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utf8 '(Ljava/lang/String;)V' ; 20
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utf8 '([Ljava/lang/String;)V' ; 21
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_dw ACC_PUBLIC ;access_flag
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_dw 1 ;this class
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_dw 3 ;super class
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_dw 0 ; interfaces_count
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; no interfaces
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_dw 0 ; fields_count
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; no fields
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_dw 1 ; methods_count
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_dw ACC_PUBLIC + ACC_STATIC
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_dw 5 ; methodname: 'main'
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_dw 21 ; return type: ([Ljava/lang/String;)V
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_dw 1 ; attribute_count
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_dw 6 ; attributename: Code
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_dd 15h ; length
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_dw 2 ; maxlocals
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_dw 1 ; maxstack
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_dd 9 ; length of bytecode
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GETSTATIC 7
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LDC 13
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INVOKEVIRTUAL 15
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RETURN
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_dw 0 ; exceptions_count
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_dw 0 ; attributes_count
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_dw 0 ;attributes_count
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; no attributes
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