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86 lines
2.2 KiB
Markdown
86 lines
2.2 KiB
Markdown
# Assembly x86_64 - Hello World!
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## Assembly Code
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We're going to use vim to write our code
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[ 192.168.0.18/24 ] [ /dev/pts/88 ] [~/binexp/asm]
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→ vim 0.asm
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section .data
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text db "Hello, World!",10
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section .text
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global _start
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_start:
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mov rax, 1
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mov rdi, 1
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mov rsi, text
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mov rdx, 14
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syscall
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mov rax, 60
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mov rdi, 0
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syscall
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## Compiling
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Here we're going to use nasm to compile our assembly code:
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[ 192.168.0.18/24 ] [ /dev/pts/89 ] [~/binexp/asm]
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→ nasm -f elf64 0.asm -o 0.o
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[ 192.168.0.18/24 ] [ /dev/pts/89 ] [~/binexp/asm]
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→ ls -lash
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total 16K
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4.0K drwxr-xr-x 2 nothing nothing 4.0K Mar 2 16:17 .
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4.0K drwxr-xr-x 5 nothing nothing 4.0K Mar 2 16:01 ..
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4.0K -rw-r--r-- 1 nothing nothing 179 Mar 2 16:09 0.asm
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4.0K -rw-r--r-- 1 nothing nothing 848 Mar 2 16:17 0.o
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Now we have our 0.asm code and the 0.o object file, now we need to link it using the gnu linker (ld) to make an executable file
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[ 192.168.0.18/24 ] [ /dev/pts/89 ] [~/binexp/asm]
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→ ld 0.o -o 0
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[ 192.168.0.18/24 ] [ /dev/pts/89 ] [~/binexp/asm]
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→ ls -lash
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total 28K
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4.0K drwxr-xr-x 2 nothing nothing 4.0K Mar 2 16:19 .
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4.0K drwxr-xr-x 5 nothing nothing 4.0K Mar 2 16:01 ..
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12K -rwxr-xr-x 1 nothing nothing 8.7K Mar 2 16:19 0
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4.0K -rw-r--r-- 1 nothing nothing 179 Mar 2 16:09 0.asm
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4.0K -rw-r--r-- 1 nothing nothing 848 Mar 2 16:17 0.o
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[ 192.168.0.18/24 ] [ /dev/pts/89 ] [~/binexp/asm]
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→ file 0
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0: ELF 64-bit LSB executable, x86-64, version 1 (SYSV), statically linked, not stripped
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and now we have our executable file called '0', we make it executable with chmod +x and then execute it:
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[ 192.168.0.18/24 ] [ /dev/pts/89 ] [~/binexp/asm]
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→ chmod +x 0
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[ 192.168.0.18/24 ] [ /dev/pts/89 ] [~/binexp/asm]
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→ ./0
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Hello, World!
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And that concludes our first assembly code! in the next part we're going to explain everything about this code [here](2.md).
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