000027d1 <phase_4>: 27d1: f3 0f 1e fb endbr32 27d5: 57 push %edi 27d6: 56 push %esi 27d7: 53 push %ebx 27d8: 8b 7c 24 10 mov 0x10(%esp),%edi 27dc: 83 ec 0c sub $0xc,%esp 27df: 57 push %edi 27e0: e8 54 04 00 00 call 2c39 <string_length> 27e5: 83 c0 01 add $0x1,%eax 27e8: 89 04 24 mov %eax,(%esp) 27eb: e8 fc ff ff ff call 27ec <phase_4+0x1b> 27f0: 89 c6 mov %eax,%esi 27f2: 83 c4 10 add $0x10,%esp 27f5: f6 07 df testb $0xdf,(%edi) 27f8: 74 5b je 2855 <phase_4+0x84> 27fa: 89 fb mov %edi,%ebx 27fc: 83 c3 01 add $0x1,%ebx 27ff: f6 03 df testb $0xdf,(%ebx) 2802: 75 f8 jne 27fc <phase_4+0x2b> 2804: 39 df cmp %ebx,%edi 2806: 74 4f je 2857 <phase_4+0x86> 2808: 89 f2 mov %esi,%edx 280a: 89 d8 mov %ebx,%eax 280c: 83 e8 01 sub $0x1,%eax 280f: 0f b6 08 movzbl (%eax),%ecx 2812: 88 0a mov %cl,(%edx) 2814: 83 c2 01 add $0x1,%edx 2817: 39 c7 cmp %eax,%edi 2819: 75 f1 jne 280c <phase_4+0x3b> 281b: 89 df mov %ebx,%edi 281d: 29 c7 sub %eax,%edi 281f: 89 f8 mov %edi,%eax 2821: 01 f0 add %esi,%eax 2823: 0f b6 13 movzbl (%ebx),%edx 2826: 84 d2 test %dl,%dl 2828: 74 0f je 2839 <phase_4+0x68> 282a: 88 10 mov %dl,(%eax) 282c: 83 c0 01 add $0x1,%eax 282f: 83 c3 01 add $0x1,%ebx 2832: 0f b6 13 movzbl (%ebx),%edx 2835: 84 d2 test %dl,%dl 2837: 75 f1 jne 282a <phase_4+0x59> 2839: c6 00 00 movb $0x0,(%eax) 283c: 83 ec 08 sub $0x8,%esp 283f: 56 push %esi 2840: 68 18 42 00 00 push $0x4218 2845: e8 11 04 00 00 call 2c5b <strings_not_equal> 284a: 83 c4 10 add $0x10,%esp 284d: 85 c0 test %eax,%eax 284f: 75 0d jne 285e <phase_4+0x8d> 2851: 5b pop %ebx 2852: 5e pop %esi 2853: 5f pop %edi 2854: c3 ret 2855: 89 fb mov %edi,%ebx 2857: e8 a8 06 00 00 call 2f04 <explode_bomb> 285c: eb aa jmp 2808 <phase_4+0x37> 285e: e8 a1 06 00 00 call 2f04 <explode_bomb> 2863: eb ec jmp 2851 <phase_4+0x80>
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.
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.
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.
There are various define directives to allocate space for variables for both initialized and uninitialized data.
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 |
| 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 can be defined using
CONSTANT_NAME EQU regular-exp or value
%assign constant_name value
%define constant_name value
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.
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