  add    byte ptr [eax], al
 add    byte ptr [eax], dl
 mov    byte ptr [0xec72fe1], al
 wait   
 add    cl, ah
 adc    eax, 0x4f5d1337
 mov    esp, 0xda18f113
 sbb    al, dl
 push   ds
 frstor dword ptr [esi - 0x5aafe096]
 les    esp, ptr [eax]
 mov    ecx, 0x4d254da4
 and    eax, 0x25f82522
 ljmp   0x8419:0xbb18da1a
 sbb    dword ptr [eax], ebx
 sbb    ch, byte ptr [ecx + ebx + 0x2fc02feb]
 shl    byte ptr [edx + 0x320932ba], 0x4b
 xor    byte ptr [esi + 0x4a5f6a6], bh
 xor    ch, byte ptr [edx + 0x133412a7]
 xor    esp, ecx
 xor    al, 0x28
 out    0x34, eax
 mov    ecx, 0x32a76334
 loopne 0x94
 dec    ecx
 inc    eax
 aaa    
 call   0x9e38b49d
 mov    byte ptr [0x38f3a2ab], al
 into   
 cmp    dword ptr [ecx + edi], esi
 and    eax, 0x5a3925a7
 cmp    bl, byte ptr [edi]
 cmp    dword ptr [eax + 0x443a763a], esi
 cmp    al, ah
 cmp    ch, byte ptr [edx - 0x25c504c6]
 cmp    ecx, dword ptr [0x1e3b023b]
 cmp    edx, dword ptr [esi]
 jns    0xca
 and    eax, 0xac3eed3e
 aas    
 pop    esp
 aas    
 jle    0x33
 movsb  byte ptr es:[edi], byte ptr [esi]
 aad    0xa5
 inc    ecx
 inc    eax
 jo     0xe2
 adc    dword ptr [eax - 0x46], eax
 inc    ecx
 push   edx
 inc    ecx
 sub    al, 0x41
 scasb  al, byte ptr es:[edi]
 inc    ecx
 imul   eax, dword ptr [ebx - 0x30], 0x42
 push   cs
 inc    esi
 or     byte ptr [ebp - 0x10], al
 inc    esi
 jmp    0x5a
 sbb    eax, 0x4ba52047
 inc    edi
 into   
 inc    edi
 jae    0x109

created 1 year ago

Assembly Online Compiler

Write, Run & Share Assembly code online using OneCompiler's Assembly online compiler for free. It's one of the robust, feature-rich online compilers for Assembly language. Getting started with the OneCompiler's Assembly compiler is simple and pretty fast. The editor shows sample boilerplate code when you choose language as Assembly and start coding.

About Assembly

Assembly language(asm) is a low-level programming language, where the language instructions will be more similar to machine code instructions.

Every assembler may have it's own assembly language designed for a specific computers or an operating system.

Assembly language requires less execution time and memory. It is more helful for direct hardware manipulation, real-time critical applications. It is used in device drivers, low-level embedded systems etc.

Syntax help

Assembly language usually consists of three sections,

Data section

To initialize variables and constants, buffer size these values doesn't change at runtime.
bss section

To declare variables
text section

_start specifies the starting of this section where the actually code is written.

Variables

There are various define directives to allocate space for variables for both initialized and uninitialized data.

1. To allocate storage space to Initialized data

Syntax

variable-name    define-directive    initial-value

Define Directive	Description	Allocated Space
DB	Define Byte	1 byte
DW	Define Word	2 bytes
DD	Define Doubleword	4 bytes
DQ	Define Quadword	8 bytes
DT	Define Ten Bytes	10 bytes

2. To allocate storage space to un-initialized data

Define Directive	Description
RESB	Reserve a Byte
RESW	Reserve a Word
RESD	Reserve a Doubleword
RESQ	Reserve a Quadword
REST	Reserve a Ten Bytes

Constants

Constants can be defined using

1. equ

To define numeric constants

CONSTANT_NAME EQU regular-exp or value

2. %assign

To define numeric constants.

%assign constant_name value

3. %define

To define numeric or string constants.

%define constant_name value

Loops

Loops are used to iterate a set of statements for a specific number of times.

mov ECX,n
L1:
;<loop body>
loop L1

where n specifies the no of times loops should iterate.

Procedures

Procedure is a sub-routine which contains set of statements. Usually procedures are written when multiple calls are required to same set of statements which increases re-usuability and modularity.

procedure_name:
   ;procedure body
   ret