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hello_world-s390x.s
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hello_world-s390x.s
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# asmsyntax=as
# Jednoducha aplikace typu "Hello world!" naprogramovana
# v assembleru GNU as.
#
# Autor: Pavel Tisnovsky
# Dan Horak
# Linux kernel system call table
sys_exit=1
sys_write=4
#-----------------------------------------------------------------------------
.section .data
hello_lbl:
.string "Hello World!\n"
#-----------------------------------------------------------------------------
.section .bss
#-----------------------------------------------------------------------------
.section .text
.global _start # tento symbol ma byt dostupny i linkeru
_start:
la 1,sys_write # cislo syscallu pro funkci "write"
la 2,1 # standardni vystup
larl 3,hello_lbl # adresa retezce, ktery se ma vytisknout
la 4,13 # pocet znaku, ktere se maji vytisknout
svc 0 # volani Linuxoveho kernelu
la 1,sys_exit # cislo sycallu pro funkci "exit"
la 2,0 # exit code = 0
svc 0 # volani Linuxoveho kernelu