Questions[assembler](ubuntu)

So I was currently studying about assembly language and I came across this awesome command on terminal, gcc -S filename.cpp, that produces the assembly code of a C++ source file.

But after I installed NASM and tried to link and compile the .S file (I also tried to use .asm by copy-pasting the code from the .s file), I only ended up facing errors in the terminal.

I am sure there were no errors in the C++ source file because its just a hello world program, but I know that I am missing something and Im hoping someone can point it out for me.

Here is the c++ source code:

#include <iostream>

using namespace std;


int main ()
{

    cout<<"wtf";

    return 0;

}

Here is the .s file code:

.file   "try1.cpp"
    .text
    .section    .rodata
    .type   _ZStL19piecewise_construct, @object
    .size   _ZStL19piecewise_construct, 1
_ZStL19piecewise_construct:
    .zero   1
    .local  _ZStL8__ioinit
    .comm   _ZStL8__ioinit,1,1
.LC0:
    .string "wtf"
    .text
    .globl  main
    .type   main, @function
main:
.LFB1493:
    .cfi_startproc
    pushq   %rbp
    .cfi_def_cfa_offset 16
    .cfi_offset 6, -16
    movq    %rsp, %rbp
    .cfi_def_cfa_register 6
    leaq    .LC0(%rip), %rsi
    leaq    _ZSt4cout(%rip), %rdi
    call    _ZStlsISt11char_traitsIcEERSt13basic_ostreamIcT_ES5_PKc@PLT
    movl    $0, %eax
    popq    %rbp
    .cfi_def_cfa 7, 8
    ret
    .cfi_endproc
.LFE1493:
    .size   main, .-main
    .type   _Z41__static_initialization_and_destruction_0ii, @function
_Z41__static_initialization_and_destruction_0ii:

    .LFB1977:
    .cfi_startproc
    pushq   %rbp
    .cfi_def_cfa_offset 16
    .cfi_offset 6, -16
    movq    %rsp, %rbp
    .cfi_def_cfa_register 6
    subq    $16, %rsp
    movl    %edi, -4(%rbp)
    movl    %esi, -8(%rbp)
    cmpl    $1, -4(%rbp)
    jne .L5
    cmpl    $65535, -8(%rbp)
    jne .L5
    leaq    _ZStL8__ioinit(%rip), %rdi
    call    _ZNSt8ios_base4InitC1Ev@PLT
    leaq    __dso_handle(%rip), %rdx
    leaq    _ZStL8__ioinit(%rip), %rsi
    movq    _ZNSt8ios_base4InitD1Ev@GOTPCREL(%rip), %rax
    movq    %rax, %rdi
    call    __cxa_atexit@PLT
.L5:
    nop
    leave
    .cfi_def_cfa 7, 8
    ret
    .cfi_endproc
.LFE1977:
    .size   _Z41__static_initialization_and_destruction_0ii, .-_Z41__static_initialization_and_destruction_0ii
    .type   _GLOBAL__sub_I_main, @function
_GLOBAL__sub_I_main:
.LFB1978:
    .cfi_startproc
    pushq   %rbp
    .cfi_def_cfa_offset 16
    .cfi_offset 6, -16
    movq    %rsp, %rbp
    .cfi_def_cfa_register 6
    movl    $65535, %esi
    movl    $1, %edi
    call    _Z41__static_initialization_and_destruction_0ii
    popq    %rbp
    .cfi_def_cfa 7, 8
    ret
    .cfi_endproc
.LFE1978:
    .size   _GLOBAL__sub_I_main, .-_GLOBAL__sub_I_main
    .section    .init_array,"aw"
    .align 8
    .quad   _GLOBAL__sub_I_main
    .hidden __dso_handle
    .ident  "GCC: (Ubuntu 7.4.0-1ubuntu1~18.04.1) 7.4.0"
    .section    .note.GNU-stack,"",@progbits

Here is the error message from the terminal:

    oliver@Nimitz:~$ nasm -f elf64 try1.asm
try1.asm:1: error: attempt to define a local label before any non-local labels
try1.asm:1: error: parser: instruction expected
try1.asm:2: warning: label alone on a line without a colon might be in error [-w+orphan-labels]
try1.asm:2: error: attempt to define a local label before any non-local labels
try1.asm:3: error: attempt to define a local label before any non-local labels
try1.asm:3: error: parser: instruction expected
try1.asm:4: error: attempt to define a local label before any non-local labels
try1.asm:4: error: parser: instruction expected
try1.asm:5: error: attempt to define a local label before any non-local labels
try1.asm:5: error: parser: instruction expected
try1.asm:7: error: parser: instruction expected
try1.asm:8: error: parser: instruction expected
try1.asm:9: error: parser: instruction expected
try1.asm:11: error: parser: instruction expected
try1.asm:12: warning: label alone on a line without a colon might be in error [-w+orphan-labels]
try1.asm:13: error: parser: instruction expected
try1.asm:14: error: parser: instruction expected
try1.asm:17: warning: label alone on a line without a colon might be in error [-w+orphan-labels]
try1.asm:18: error: parser: instruction expected
try1.asm:19: error: parser: instruction expected
try1.asm:20: error: parser: instruction expected
try1.asm:21: error: expression syntax error
try1.asm:22: error: parser: instruction expected
try1.asm:23: error: parser: instruction expected
try1.asm:24: error: symbol `leaq' redefined
try1.asm:24: error: parser: instruction expected
try1.asm:26: error: parser: instruction expected
try1.asm:27: error: parser: instruction expected
try1.asm:28: error: parser: instruction expected
try1.asm:30: warning: label alone on a line without a colon might be in error [-w+orphan-labels]
try1.asm:32: error: parser: instruction expected
try1.asm:33: error: parser: instruction expected
try1.asm:36: warning: label alone on a line without a colon might be in error [-w+orphan-labels]
try1.asm:37: error: symbol `pushq' redefined
try1.asm:37: error: parser: instruction expected
try1.asm:38: error: parser: instruction expected
try1.asm:39: error: parser: instruction expected
try1.asm:40: error: expression syntax error
try1.asm:41: error: parser: instruction expected
try1.asm:42: error: parser: instruction expected
try1.asm:43: error: symbol `movl' redefined
try1.asm:43: error: parser: instruction expected
try1.asm:44: error: symbol `movl' redefined
try1.asm:44: error: parser: instruction expected
try1.asm:45: error: parser: instruction expected
try1.asm:47: error: symbol `cmpl' redefined
try1.asm:47: error: parser: instruction expected
try1.asm:49: error: symbol `leaq' redefined
try1.asm:49: error: parser: instruction expected
try1.asm:51: error: symbol `leaq' redefined
try1.asm:51: error: parser: instruction expected
try1.asm:52: error: symbol `leaq' redefined
try1.asm:52: error: parser: instruction expected
try1.asm:53: error: comma, colon, decorator or end of line expected after operand
try1.asm:53: error: expression syntax error
try1.asm:54: error: expression syntax error
try1.asm:59: error: parser: instruction expected
try1.asm:61: warning: label alone on a line without a colon might be in error [-w+orphan-labels]
try1.asm:63: error: parser: instruction expected
try1.asm:64: error: parser: instruction expected
try1.asm:67: warning: label alone on a line without a colon might be in error [-w+orphan-labels]
try1.asm:68: error: symbol `pushq' redefined
try1.asm:68: error: parser: instruction expected
try1.asm:69: error: parser: instruction expected
try1.asm:70: error: parser: instruction expected
try1.asm:71: error: expression syntax error
try1.asm:72: error: parser: instruction expected
try1.asm:73: error: symbol `movl' redefined
try1.asm:73: error: parser: instruction expected
try1.asm:74: error: symbol `movl' redefined
try1.asm:74: error: parser: instruction expected
try1.asm:76: error: symbol `popq' redefined
try1.asm:76: error: parser: instruction expected
try1.asm:77: error: parser: instruction expected
try1.asm:79: warning: label alone on a line without a colon might be in error [-w+orphan-labels]
try1.asm:81: error: parser: instruction expected
try1.asm:82: error: parser: instruction expected
try1.asm:83: error: parser: instruction expected
try1.asm:84: error: parser: instruction expected
try1.asm:85: error: parser: instruction expected
try1.asm:86: error: parser: instruction expected
try1.asm:87: error: symbol `.section' redefined
try1.asm:87: error: parser: instruction expected
oliver@Nimitz:~$ 

I have a problem when debugging Assembly code with DDD (also tried GDB). When I compile my program and make executable file with gcc -g -o program program.S I need to add -m32 to make 32-bit executable file. But when I open DDD and click "Run" , warnings start to pop-up and after that it looks like program went into inf loop or expects something to be entered from keyboard("Continuing"). I will add two pictures where you can see in bottom left corner what I talked about. PS: I am sure that the problem is not in code(the program executes correctly).

After this, it just shows "Continuing" where warnings were.

How can I run the code of Masm on Ubuntu? I cannot use Windows as a virtual machine and neither can I use Nasm.

My system is Ubuntu 18.04 64bit . with build-essentials and devtools installed.

Hi, I have an assembly file called Hello.s Here is it's content:

        #This is a simple "Hello World!" program
    .section    .rodata #read only data section
str:    .string "Hello World!\n"
    ########
    .text   #the beginnig of the code
.globl  main    #the label "main" is used to state the initial point of this program
    .type   main, @function # the label "main" representing the beginning of a function
main:   # the main function:
    pushq   %rbp        #save the old frame pointer
    movq    %rsp,   %rbp    #create the new frame pointer

    movq    $str,%rdi   #the string is the only paramter passed to the printf function (remember- first parameter goes in %rdi).
    movq    $0,%rax
    call    printf      #calling to printf AFTER we passed its parameters.

    #return from printf:
    movq    $0, %rax    #return value is zero (just like in c - we tell the OS that this program finished seccessfully)
    movq    %rbp, %rsp  #restore the old stack pointer - release all used memory.
    popq    %rbp        #restore old frame pointer (the caller function frame)
    ret         #return to caller function (OS)

Trying to compile it using gcc -Hello.s returns the following message:

/usr/bin/ld: /tmp/ccY9hdWi.o: relocation R_X86_64_32S against `.rodata' can not be used when making a PIE object; recompile with -fPIC

/usr/bin/ld: final link failed: Nonrepresentable section on output collect2: error: ld returned 1 exit status

Tried gcc -fPIC Hello.s that has no effect - brings the same message.

Some people told me to install gcc-4.8, well that didn't work

Installing a previous version of ubuntu was also proposed.. well that's the last resort in my opinion.

Any suggestions?

So recently I've wanted to learn assembly, so I learnt a bit. I put this into nano and saved it as playground.asm. Now I'm wondering, how do I compile and run it? I've already searched everywhere and still cant find it. I'm really curious and there's no point learning a language if you can't even use it.