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Archive for December 30th, 2018

In this tutorial I will show you how to generate assembly language code from c using gcc.

First, type the c code below, save it to ‘hello.c’.

1 #include
2 main()
3 {
4 printf("Hello World!\n");
5 return 0;
6 }

To generate assembly code use option -S.

$ gcc -S hello.c -o hello.s

Check the result

$ ls -l hello.s
-rwxrwxr-x 1 darklinux darklinux 491 2018-12-29 18:10 hello.s
$

Open with text editor.

1 .file "hello.c"
2 .section .rodata
3 .LC0:
4 .string "Hello World!"
5 .text
6 .globl main
7 .type main, @function
8 main:
9 .LFB0:
10 .cfi_startproc
11 pushl %ebp
12 .cfi_def_cfa_offset 8
13 .cfi_offset 5, -8
14 movl %esp, %ebp
15 .cfi_def_cfa_register 5
16 andl $-16, %esp
17 subl $16, %esp
18 movl $.LC0, (%esp)
19 call puts
20 movl $0, %eax
21 leave
22 .cfi_restore 5
23 .cfi_def_cfa 4, 4
24 ret
25 .cfi_endproc
26 .LFE0:
27 .size main, .-main
28 .ident "GCC: (Ubuntu/Linaro 4.6.1-9ubuntu3) 4.6.1"
29 .section .note.GNU-stack,"",@progbits
30

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