What does this assembly code do?

What does this assembly code do?

An assembly language is a low-level programming language designed for a specific type of processor. It may be produced by compiling source code from a high-level programming language (such as C/C++) but can also be written from scratch. Assembly code can be converted to machine code using an assembler.

What are the codes used in assembly language?

Answer: Asm is generally the term for assembly language. There are different codes that are used in this language and these include: source code, opcode, architectural register, flag and different other addressing modes.

What does RBP point to?

rbp is the base pointer, which points to the base of the current stack frame, and rsp is the stack pointer, which points to the top of the current stack frame.

What is assembly written in?

The C programming language is often called “portable assembly” because C compilers exist for nearly every modern system architecture. A program written in C may require some changes before it will compile on another computer, but the core language is portable.

What can assembly do that C Cannot?

In many cases, assembly will allow you to do more low-level things that C simply cannot do. For example, with assembly you can take advantage of MMX or SSE instructions directly. So in the end, focus on what you want to accomplish.

What are mnemonic codes?

A code that can be remembered comparatively easily and that aids its user in recalling the information it represents. Mnemonic codes are widely used in computer programming and communications system operations to specify instructions.

What is MOV RBP RSP?

Stack Frames: rbp There’s one fairly handy saved register called rbp, which means “extended base pointer”. Here’s the standard use of rbp: to stash the value of the stack pointer at the start of the function. mov rsp,rbp; restore stack pointer (easier than figuring the correct “add”!)

What happens when you go from machine language to assembly language?

When you go from machine language to assembly language, the process is called “disassembling”. Here is the machine language from our above example, together with the disassembled code:

How to disassemble assembly language programs?

You can disassemble by hand by looking at an opcode map as we pointed out above, though disassembler programs do exist. For NASM, you can use NDISASM, and for GAS, you use objdump or gdb. Assembly language programs need more than just processor instructions (such as add, mov and so on…).

What are assembly language directives and how do they work?

Assembly language programs need more than just processor instructions (such as add, mov and so on…). They need directives to tell the assembler such things as which symbols and labels to import and export so the code can use code written in other files.

What are conditions in assembly language?

Assembly – Conditions. Conditional execution in assembly language is accomplished by several looping and branching instructions. These instructions can change the flow of control in a program.