Assembly code of a C code

We usually use gcc to compile c codes. However, to see assembly code of the C code

that we write, we should add "-S" option while compiling the code.

 

gcc -S -c code.c

 

   The command above compiles code.c as it generates code.s file which includes assembly code.

 

 

 Example C code and generated Assembly Code.

 

  code.c

#include <stdio.h>

int main(int argc, char *argv[])
{
        return 0;
}

 

  code.s

.file   "code.c"
.text
.globl main
        .type   main, @function
main:
        leal    4(%esp), %ecx
        andl    $-16, %esp
        pushl   -4(%ecx)
        pushl   %ebp
        movl    %esp, %ebp
        pushl   %ecx
        movl    $0, %eax
        popl    %ecx
        popl    %ebp
        leal    -4(%ecx), %esp
        ret
        .size   main, .-main
        .ident  "GCC: (GNU) 4.1.2 20061115 (prerelease) (Debian 4.1.1-21)"
        .section        .note.GNU-stack,"",@progbits

 

 

 

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