nortega/x86-64helloworld
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Optimized the code a bit.

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Nicolás A. Ortega 2016-09-18 21:06:35 +02:00
parent e5369eca59
commit d058ad9d31
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1 changed files with 6 additions and 4 deletions
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src/helloworld.asm
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@ -1,6 +1,8 @@
.section .data .section .data
hello: hello:
.ascii "Hello, World.\n" # the string .ascii "Hello, World!\n" # the string
hello_end:
.equ hello_len, hello_end - hello
.section .text .section .text
.global _start .global _start
@ -9,9 +11,9 @@ _start:
mov $1, %rax # Define write syscall mov $1, %rax # Define write syscall
mov $1, %rdi # Define stdout mov $1, %rdi # Define stdout
mov $hello, %rsi # Give string mov $hello, %rsi # Give string
mov $14, %rdx # Give size of the string mov $hello_len, %rdx # Give size of the string
syscall # Call the kernel to do work for us syscall # Call the kernel to do work for us
mov $60, %rax # Define exit syscall mov $60, %rax # Define exit syscall
xor %rdi, %rdi # Give return value mov $0, %rdi # Give return value
syscall # Call the kernel to do work for us syscall # Call the kernel to do work for us