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how to convert c/c++ into assembly then compile using gcc
Tutorial Name: how to convert c/c++ into assembly then compile using gcc
Category: PC Tutorials
Submitted By: Ella
Date Added:
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Views: 5,569
Related Forum: PC Building Forum
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alright, don't really know what the use of doing this would be maybe if you were writing an OS or just felt like looking at c/c++ code in assembly. also this could be used as a way to encrypt your programs maybe?
well anyways here it is.
first make a hello world application in either c/c++
Hello World - C
#include <stdio.h>
int main(void){
printf("Hello World\n");
}
Hello World - C++
#include <iostream>
using namespace std;
int main(){
cout<<"Hello World"<<endl;
}
you can just copy/paste it into gedit or whatever text editor your using.
and then save as whatever.cpp or whatever.c
next your going to open up terminal
alt+t or in my case just click on it.
and your going to go to the directory in which your c/cpp file is in.
e.g. Desktop
blah blah blah.
then your going to type
g++ -S whatever.cpp
or
gcc -S whatever.c
either or you will wind up with a file named whatever.s
this is your converted code from c/cpp to assembly.
and to compile and run simply use either gcc or g++ and compile as you normally would a c/cpp program
gcc -o whatever whatever.s
or
g++ -o whatever whatever.s
then
./whatever
I must stress to get the source code in assembly you must type a capital "S" when you convert.
if it is lower case it will just automatically give you an a.out and won't give you whatever.s
hope you enjoyed
here is what this hello world program looks like in assembly
.file "dragon.cpp"
.local _ZStL8__ioinit
.comm _ZStL8__ioinit,1,1
.section .rodata
.LC0:
.string "Hello World"
.text
.globl main
.type main, @function
main:
.LFB963:
.cfi_startproc
pushl %ebp
.cfi_def_cfa_offset 8
movl %esp, %ebp
.cfi_offset 5, -8
.cfi_def_cfa_register 5
andl $-16, %esp
subl $16, %esp
movl $.LC0, 4(%esp)
movl $_ZSt4cout, (%esp)
call _ZStlsISt11char_traitsIcEERSt13basic_ostreamIcT_ES5_PKc
movl $_ZSt4endlIcSt11char_traitsIcEERSt13basic_ostreamIT_T0_ES6_, 4(%esp)
movl %eax, (%esp)
call _ZNSolsEPFRSoS_E
movl $0, %eax
leave
.cfi_restore 5
.cfi_def_cfa 4, 4
ret
.cfi_endproc
.LFE963:
.size main, .-main
.type _Z41__static_initialization_and_destruction_0ii, @function
_Z41__static_initialization_and_destruction_0ii:
.LFB972:
.cfi_startproc
pushl %ebp
.cfi_def_cfa_offset 8
movl %esp, %ebp
.cfi_offset 5, -8
.cfi_def_cfa_register 5
subl $24, %esp
cmpl $1, 8(%ebp)
jne .L2
cmpl $65535, 12(%ebp)
jne .L2
movl $_ZStL8__ioinit, (%esp)
call _ZNSt8ios_base4InitC1Ev
movl $_ZNSt8ios_base4InitD1Ev, %eax
movl $__dso_handle, 8(%esp)
movl $_ZStL8__ioinit, 4(%esp)
movl %eax, (%esp)
call __cxa_atexit
.L2:
leave
.cfi_restore 5
.cfi_def_cfa 4, 4
ret
.cfi_endproc
.LFE972:
.size _Z41__static_initialization_and_destruction_0ii, .-_Z41__static_initialization_and_destruction_0ii
.type _GLOBAL__I_main, @function
_GLOBAL__I_main:
.LFB973:
.cfi_startproc
pushl %ebp
.cfi_def_cfa_offset 8
movl %esp, %ebp
.cfi_offset 5, -8
.cfi_def_cfa_register 5
subl $24, %esp
movl $65535, 4(%esp)
movl $1, (%esp)
call _Z41__static_initialization_and_destruction_0ii
leave
.cfi_restore 5
.cfi_def_cfa 4, 4
ret
.cfi_endproc
.LFE973:
.size _GLOBAL__I_main, .-_GLOBAL__I_main
.section .ctors,"aw",@progbits
.align 4
.long _GLOBAL__I_main
.weakref _ZL20__gthrw_pthread_oncePiPFvvE,pthread_once
.weakref _ZL27__gthrw_pthread_getspecificj,pthread_getspecific
.weakref _ZL27__gthrw_pthread_setspecificjPKv,pthread_setspecific
.weakref _ZL22__gthrw_pthread_createPmPK14pthread_attr_tPFPvS3_ES3_,pthread_create
.weakref _ZL20__gthrw_pthread_joinmPPv,pthread_join
.weakref _ZL21__gthrw_pthread_equalmm,pthread_equal
.weakref _ZL20__gthrw_pthread_selfv,pthread_self
.weakref _ZL22__gthrw_pthread_detachm,pthread_detach
.weakref _ZL22__gthrw_pthread_cancelm,pthread_cancel
.weakref _ZL19__gthrw_sched_yieldv,sched_yield
.weakref _ZL26__gthrw_pthread_mutex_lockP15pthread_mutex_t,pthread_mutex_lock
.weakref _ZL29__gthrw_pthread_mutex_trylockP15pthread_mutex_t,pthread_mutex_trylock
.weakref _ZL31__gthrw_pthread_mutex_timedlockP15pthread_mutex_tPK8timespec,pthread_mutex_timedlock
.weakref _ZL28__gthrw_pthread_mutex_unlockP15pthread_mutex_t,pthread_mutex_unlock
.weakref _ZL26__gthrw_pthread_mutex_initP15pthread_mutex_tPK19pthread_mutexattr_t,pthread_mutex_init
.weakref _ZL29__gthrw_pthread_mutex_destroyP15pthread_mutex_t,pthread_mutex_destroy
.weakref _ZL30__gthrw_pthread_cond_broadcastP14pthread_cond_t,pthread_cond_broadcast
.weakref _ZL27__gthrw_pthread_cond_signalP14pthread_cond_t,pthread_cond_signal
.weakref _ZL25__gthrw_pthread_cond_waitP14pthread_cond_tP15pthread_mutex_t,pthread_cond_wait
.weakref _ZL30__gthrw_pthread_cond_timedwaitP14pthread_cond_tP15pthread_mutex_tPK8timespec,pthread_cond_
timedwait
.weakref _ZL28__gthrw_pthread_cond_destroyP14pthread_cond_t,pthread_cond_destroy
.weakref _ZL26__gthrw_pthread_key_createPjPFvPvE,pthread_key_create
.weakref _ZL26__gthrw_pthread_key_deletej,pthread_key_delete
.weakref _ZL30__gthrw_pthread_mutexattr_initP19pthread_mutexattr_t,pthread_mutexattr_init
.weakref _ZL33__gthrw_pthread_mutexattr_settypeP19pthread_mutexattr_ti,pthread_mutexattr_settype
.weakref _ZL33__gthrw_pthread_mutexattr_destroyP19pthread_mutexattr_t,pthread_mutexattr_destroy
.ident "GCC: (Ubuntu/Linaro 4.5.2-8ubuntu4) 4.5.2"
.section .note.GNU-stack,"",@progbits
hope you enjoyed this tutorial.
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