x86 assembly language

Short description: Family of backward-compatible assembly languages

x86 assembly language is the name for the family of assembly languages which provide some level of backward compatibility with CPUs back to the Intel 8008 microprocessor, which was launched in April 1972. It is used to produce object code for the x86 class of processors.

Regarded as a programming language, assembly is machine-specific and low-level. Like all assembly languages, x86 assembly uses mnemonics to represent fundamental CPU instructions, or machine code. Assembly languages are most often used for detailed and time-critical applications such as small real-time embedded systems, operating-system kernels, and device drivers, but can also be used for other applications. A compiler will sometimes produce assembly code as an intermediate step when translating a high-level program into machine code.

Keyword

Reserved keywords of x86 assembly language

Mnemonics and opcodes

Further information: X86 instruction listings

Each x86 assembly instruction is represented by a mnemonic which, often combined with one or more operands, translates to one or more bytes called an opcode; the NOP instruction translates to 0x90, for instance, and the HLT instruction translates to 0xF4. There are potential opcodes with no documented mnemonic which different processors may interpret differently, making a program using them behave inconsistently or even generate an exception on some processors. These opcodes often turn up in code writing competitions as a way to make the code smaller, faster, more elegant or just show off the author's prowess.

Syntax

x86 assembly language has two main syntax branches: Intel syntax and AT&T syntax. Intel syntax is dominant in the DOS and Windows world, and AT&T syntax is dominant in the Unix world, since Unix was created at AT&T Bell Labs. Here is a summary of the main differences between Intel syntax and AT&T syntax:

	AT&T	Intel
Parameter order	movl $5, %eax Source before the destination.	mov eax, 5 Destination before source.
Parameter size	addl $0x24, %esp movslq %ecx, %rax paddd %xmm1, %xmm2 Mnemonics are suffixed with a letter indicating the size of the operands: q for qword (64 bits), l for long (dword, 32 bits), w for word (16 bits), and b for byte (8 bits).	add esp, 24h movsxd rax, ecx paddd xmm2, xmm1 Derived from the name of the register that is used (e.g. rax, eax, ax, al imply q, l, w, b, respectively). Width-based names may still appear in instructions when they define a different operation. MOVSXD refers to sign extension with dword input, unlike MOVSX. SIMD registers have width-named instructions that determine how to split up the register. AT&T tends to keep the names unchanged, so PADDD is not renamed to "paddl".
Sigils	Immediate values prefixed with a "$", registers prefixed with a "%".	The assembler automatically detects the type of symbols; i.e., whether they are registers, constants or something else.
Effective addresses	movl offset(%ebx,%ecx,4), %eax General syntax of DISP(BASE,INDEX,SCALE).	mov eax, [ebx + ecx*4 + offset] Arithmetic expressions in square brackets; additionally, size keywords like byte, word, or dword have to be used if the size cannot be determined from the operands.

Many x86 assemblers use Intel syntax, including FASM, MASM, NASM, TASM, and YASM. GAS, which originally used AT&T syntax, has supported both syntaxes since version 2.10 via the .intel_syntax directive. A quirk in the AT&T syntax for x86 is that x87 operands are reversed, an inherited bug from the original AT&T assembler.

The AT&T syntax is nearly universal to all other architectures (retaining the same mov order); it was originally a syntax for PDP-11 assembly. The Intel syntax is specific to the x86 architecture, and is the one used in the x86 platform's documentation. The Intel 8080, which predates the x86, also uses the "destination-first" order for mov.

Registers

x86 processors have a collection of registers available to be used as stores for binary data. Collectively the data and address registers are called the general registers. Each register has a special purpose in addition to what they can all do:

• AX multiply/divide, string load & store
• BX index register for MOVE
• CX count for string operations & shifts
• DX port address for IN and OUT
• SP points to top of the stack
• BP points to base of the stack frame
• SI points to a source in stream operations
• DI points to a destination in stream operations

Along with the general registers there are additionally the:

• IP instruction pointer
• FLAGS
• segment registers (CS, DS, ES, FS, GS, SS) which determine where a 64k segment starts (no FS & GS in 80286 & earlier)
• extra extension registers (MMX, 3DNow!, SSE, etc.) (Pentium & later only).

The IP register points to the memory offset of the next instruction in the code segment (it points to the first byte of the instruction). The IP register cannot be accessed by the programmer directly.

The x86 registers can be used by using the MOV instructions. For example, in Intel syntax:

mov ax, 1234h ; copies the value 1234hex (4660d) into register AX

mov bx, ax    ; copies the value of the AX register into the BX register

Segmented addressing

The x86 architecture in real and virtual 8086 mode uses a process known as segmentation to address memory, not the flat memory model used in many other environments. Segmentation involves composing a memory address from two parts, a segment and an offset; the segment points to the beginning of a 64 KiB (64×2¹⁰) group of addresses and the offset determines how far from this beginning address the desired address is. In segmented addressing, two registers are required for a complete memory address. One to hold the segment, the other to hold the offset. In order to translate back into a flat address, the segment value is shifted four bits left (equivalent to multiplication by 2⁴ or 16) then added to the offset to form the full address, which allows breaking the 64k barrier through clever choice of addresses, though it makes programming considerably more complex.

In real mode/protected only, for example, if DS contains the hexadecimal number 0xDEAD and DX contains the number 0xCAFE they would together point to the memory address 0xDEAD * 0x10 + 0xCAFE == 0xEB5CE. Therefore, the CPU can address up to 1,048,576 bytes (1 MB) in real mode. By combining segment and offset values we find a 20-bit address.

The original IBM PC restricted programs to 640 KB but an expanded memory specification was used to implement a bank switching scheme that fell out of use when later operating systems, such as Windows, used the larger address ranges of newer processors and implemented their own virtual memory schemes.

Protected mode, starting with the Intel 80286, was utilized by OS/2. Several shortcomings, such as the inability to access the BIOS and the inability to switch back to real mode without resetting the processor, prevented widespread usage. The 80286 was also still limited to addressing memory in 16-bit segments, meaning only 2¹⁶ bytes (64 kilobytes) could be accessed at a time. To access the extended functionality of the 80286, the operating system would set the processor into protected mode, enabling 24-bit addressing and thus 2²⁴ bytes of memory (16 megabytes).

In protected mode, the segment selector can be broken down into three parts: a 13-bit index, a Table Indicator bit that determines whether the entry is in the GDT or LDT and a 2-bit Requested Privilege Level; see x86 memory segmentation.

When referring to an address with a segment and an offset the notation of segment:offset is used, so in the above example the flat address 0xEB5CE can be written as 0xDEAD:0xCAFE or as a segment and offset register pair; DS:DX.

There are some special combinations of segment registers and general registers that point to important addresses:

• CS:IP (CS is Code Segment, IP is Instruction Pointer) points to the address where the processor will fetch the next byte of code.
• SS:SP (SS is Stack Segment, SP is Stack Pointer) points to the address of the top of the stack, i.e. the most recently pushed byte.
• SS:BP (SS is Stack Segment, BP is Stack Frame Pointer) points to the address of the top of the stack frame, i.e. the base of the data area in the call stack for the currently active subprogram.
• DS:SI (DS is Data Segment, SI is Source Index) is often used to point to string data that is about to be copied to ES:DI.
• ES:DI (ES is Extra Segment, DI is Destination Index) is typically used to point to the destination for a string copy, as mentioned above.

The Intel 80386 featured three operating modes: real mode, protected mode and virtual mode. The protected mode which debuted in the 80286 was extended to allow the 80386 to address up to 4 GB of memory, the all new virtual 8086 mode (VM86) made it possible to run one or more real mode programs in a protected environment which largely emulated real mode, though some programs were not compatible (typically as a result of memory addressing tricks or using unspecified op-codes).

The 32-bit flat memory model of the 80386's extended protected mode may be the most important feature change for the x86 processor family until AMD released x86-64 in 2003, as it helped drive large scale adoption of Windows 3.1 (which relied on protected mode) since Windows could now run many applications at once, including DOS applications, by using virtual memory and simple multitasking.

Execution modes

The x86 processors support five modes of operation for x86 code, Real Mode, Protected Mode, Long Mode, Virtual 86 Mode, and System Management Mode, in which some instructions are available and others are not. A 16-bit subset of instructions is available on the 16-bit x86 processors, which are the 8086, 8088, 80186, 80188, and 80286. These instructions are available in real mode on all x86 processors, and in 16-bit protected mode (80286 onwards), additional instructions relating to protected mode are available. On the 80386 and later, 32-bit instructions (including later extensions) are also available in all modes, including real mode; on these CPUs, V86 mode and 32-bit protected mode are added, with additional instructions provided in these modes to manage their features. SMM, with some of its own special instructions, is available on some Intel i386SL, i486 and later CPUs. Finally, in long mode (AMD Opteron onwards), 64-bit instructions, and more registers, are also available. The instruction set is similar in each mode but memory addressing and word size vary, requiring different programming strategies.

The modes in which x86 code can be executed in are:

• Real mode (16-bit)
  • 20-bit segmented memory address space (meaning that only 1 MB of memory can be addressed— actually since 80286 a little more through HMA), direct software access to peripheral hardware, and no concept of memory protection or multitasking at the hardware level. Computers that use BIOS start up in this mode.
• Protected mode (16-bit and 32-bit)
  • Expands addressable physical memory to 16 MB and addressable virtual memory to 1 GB. Provides privilege levels and protected memory, which prevents programs from corrupting one another. 16-bit protected mode (used during the end of the DOS era) used a complex, multi-segmented memory model. 32-bit protected mode uses a simple, flat memory model.
• Long mode (64-bit)
  • Mostly an extension of the 32-bit (protected mode) instruction set, but unlike the 16–to–32-bit transition, many instructions were dropped in the 64-bit mode. Pioneered by AMD.
• Virtual 8086 mode (16-bit)
  • A special hybrid operating mode that allows real mode programs and operating systems to run while under the control of a protected mode supervisor operating system
• System Management Mode (16-bit)
  • Handles system-wide functions like power management, system hardware control, and proprietary OEM designed code. It is intended for use only by system firmware. All normal execution, including the operating system, is suspended. An alternate software system (which usually resides in the computer's firmware, or a hardware-assisted debugger) is then executed with high privileges.

Switching modes

The processor runs in real mode immediately after power on, so an operating system kernel, or other program, must explicitly switch to another mode if it wishes to run in anything but real mode. Switching modes is accomplished by modifying certain bits of the processor's control registers after some preparation, and some additional setup may be required after the switch.

Examples

With a computer running legacy BIOS, the BIOS and the boot loader run in Real mode. The 64-bit operating system kernel checks and switches the CPU into Long mode and then starts new kernel-mode threads running 64-bit code.

With a computer running UEFI, the UEFI firmware (except CSM and legacy Option ROM), the UEFI boot loader and the UEFI operating system kernel all run in Long mode.

Instruction types

In general, the features of the modern x86 instruction set are:

• A compact encoding
  • Variable length and alignment independent (encoded as little endian, as is all data in the x86 architecture)
  • Mainly one-address and two-address instructions, that is to say, the first operand is also the destination.
  • Memory operands as both source and destination are supported (frequently used to read/write stack elements addressed using small immediate offsets).
  • Both general and implicit register usage; although all seven (counting ebp) general registers in 32-bit mode, and all fifteen (counting rbp) general registers in 64-bit mode, can be freely used as accumulators or for addressing, most of them are also implicitly used by certain (more or less) special instructions; affected registers must therefore be temporarily preserved (normally stacked), if active during such instruction sequences.
• Produces conditional flags implicitly through most integer ALU instructions.
• Supports various addressing modes including immediate, offset, and scaled index but not PC-relative, except jumps (introduced as an improvement in the x86-64 architecture).
• Includes floating point to a stack of registers.
• Contains special support for atomic read-modify-write instructions (xchg, cmpxchg/cmpxchg8b, xadd, and integer instructions which combine with the lock prefix)
• SIMD instructions (instructions which perform parallel simultaneous single instructions on many operands encoded in adjacent cells of wider registers).

Stack instructions

The x86 architecture has hardware support for an execution stack mechanism. Instructions such as push, pop, call and ret are used with the properly set up stack to pass parameters, to allocate space for local data, and to save and restore call-return points. The ret size instruction is very useful for implementing space efficient (and fast) calling conventions where the callee is responsible for reclaiming stack space occupied by parameters.

When setting up a stack frame to hold local data of a recursive procedure there are several choices; the high level enter instruction (introduced with the 80186) takes a procedure-nesting-depth argument as well as a local size argument, and may be faster than more explicit manipulation of the registers (such as push bp ; mov bp, sp ; sub sp, size). Whether it is faster or slower depends on the particular x86-processor implementation as well as the calling convention used by the compiler, programmer or particular program code; most x86 code is intended to run on x86-processors from several manufacturers and on different technological generations of processors, which implies highly varying microarchitectures and microcode solutions as well as varying gate- and transistor-level design choices.

The full range of addressing modes (including immediate and base+offset) even for instructions such as push and pop, makes direct usage of the stack for integer, floating point and address data simple, as well as keeping the ABI specifications and mechanisms relatively simple compared to some RISC architectures (require more explicit call stack details).

Integer ALU instructions

x86 assembly has the standard mathematical operations, add, sub, neg, imul and idiv (for signed integers), with mul and div (for unsigned integers); the logical operators and, or, xor, not; bitshift arithmetic and logical, sal/sar (for signed integers), shl/shr (for unsigned integers); rotate with and without carry, rcl/rcr, rol/ror, a complement of BCD arithmetic instructions, aaa, aad, daa and others.

Floating-point instructions

x86 assembly language includes instructions for a stack-based floating-point unit (FPU). The FPU was an optional separate coprocessor for the 8086 through the 80386, it was an on-chip option for the 80486 series, and it is a standard feature in every Intel x86 CPU since the 80486, starting with the Pentium. The FPU instructions include addition, subtraction, negation, multiplication, division, remainder, square roots, integer truncation, fraction truncation, and scale by power of two. The operations also include conversion instructions, which can load or store a value from memory in any of the following formats: binary-coded decimal, 32-bit integer, 64-bit integer, 32-bit floating-point, 64-bit floating-point or 80-bit floating-point (upon loading, the value is converted to the currently used floating-point mode). x86 also includes a number of transcendental functions, including sine, cosine, tangent, arctangent, exponentiation with the base 2 and logarithms to bases 2, 10, or e.

The stack register to stack register format of the instructions is usually fop st, st(n) or fop st(n), st, where st is equivalent to st(0), and st(n) is one of the 8 stack registers (st(0), st(1), ..., st(7)). Like the integers, the first operand is both the first source operand and the destination operand. fsubr and fdivr should be singled out as first swapping the source operands before performing the subtraction or division. The addition, subtraction, multiplication, division, store and comparison instructions include instruction modes that pop the top of the stack after their operation is complete. So, for example, faddp st(1), st performs the calculation st(1) = st(1) + st(0), then removes st(0) from the top of stack, thus making what was the result in st(1) the top of the stack in st(0).

SIMD instructions

Modern x86 CPUs contain SIMD instructions, which largely perform the same operation in parallel on many values encoded in a wide SIMD register. Various instruction technologies support different operations on different register sets, but taken as complete whole (from MMX to SSE4.2) they include general computations on integer or floating-point arithmetic (addition, subtraction, multiplication, shift, minimization, maximization, comparison, division or square root). So for example, paddw mm0, mm1 performs 4 parallel 16-bit (indicated by the w) integer adds (indicated by the padd) of mm0 values to mm1 and stores the result in mm0. Streaming SIMD Extensions or SSE also includes a floating-point mode in which only the very first value of the registers is actually modified (expanded in SSE2). Some other unusual instructions have been added including a sum of absolute differences (used for motion estimation in video compression, such as is done in MPEG) and a 16-bit multiply accumulation instruction (useful for software-based alpha-blending and digital filtering). SSE (since SSE3) and 3DNow! extensions include addition and subtraction instructions for treating paired floating-point values like complex numbers.

These instruction sets also include numerous fixed sub-word instructions for shuffling, inserting and extracting the values around within the registers. In addition there are instructions for moving data between the integer registers and XMM (used in SSE)/FPU (used in MMX) registers.

Memory instructions

The x86 processor also includes complex addressing modes for addressing memory with an immediate offset, a register, a register with an offset, a scaled register with or without an offset, and a register with an optional offset and another scaled register. So for example, one can encode mov eax, [Table + ebx + esi*4] as a single instruction which loads 32 bits of data from the address computed as (Table + ebx + esi * 4) offset from the ds selector, and stores it to the eax register. In general x86 processors can load and use memory matched to the size of any register it is operating on. (The SIMD instructions also include half-load instructions.)

Most 2-operand x86 instructions, including integer ALU instructions, use a standard "addressing mode byte" often called the MOD-REG-R/M byte. Many 32-bit x86 instructions also have a SIB addressing mode byte that follows the MOD-REG-R/M byte.

In principle, because the instruction opcode is separate from the addressing mode byte, those instructions are orthogonal because any of those opcodes can be mixed-and-matched with any addressing mode. However, the x86 instruction set is generally considered non-orthogonal because many other opcodes have some fixed addressing mode (they have no addressing mode byte), and every register is special.

The x86 instruction set includes string load, store, move, scan and compare instructions (lods, stos, movs, scas and cmps) which perform each operation to a specified size (b for 8-bit byte, w for 16-bit word, d for 32-bit double word) then increments/decrements (depending on DF, direction flag) the implicit address register (si for lods, di for stos and scas, and both for movs and cmps). For the load, store and scan operations, the implicit target/source/comparison register is in the al, ax or eax register (depending on size). The implicit segment registers used are ds for si and es for di. The cx or ecx register is used as a decrementing counter, and the operation stops when the counter reaches zero or (for scans and comparisons) when inequality is detected. Unfortunately, over the years the performance of some of these instructions became neglected and in certain cases it is now possible to get faster results by writing out the algorithms yourself. Intel and AMD have refreshed some of the instructions though, and a few now have very respectable performance, so it is recommended that the programmer should read recent respected benchmark articles before choosing to use a particular instruction from this group.

The stack is a region of memory and an associated ‘stack pointer’, which points to the bottom of the stack. The stack pointer is decremented when items are added (‘push’) and incremented after things are removed (‘pop’). In 16-bit mode, this implicit stack pointer is addressed as SS:[SP], in 32-bit mode it is SS:[ESP], and in 64-bit mode it is [RSP]. The stack pointer actually points to the last value that was stored, under the assumption that its size will match the operating mode of the processor (i.e., 16, 32, or 64 bits) to match the default width of the push/pop/call/ret instructions. Also included are the instructions enter and leave which reserve and remove data from the top of the stack while setting up a stack frame pointer in bp/ebp/rbp. However, direct setting, or addition and subtraction to the sp/esp/rsp register is also supported, so the enter/leave instructions are generally unnecessary.

This code is the beginning of a function typical for a high-level language when compiler optimisation is turned off for ease of debugging:

push    rbp       ; Save the calling function’s stack frame pointer (rbp register)
 mov     rbp, rsp  ; Make a new stack frame below our caller’s stack
 sub     rsp, 32   ; Reserve 32 bytes of stack space for this function’s local variables.
                   ; Local variables will be below rbp and can be referenced relative to rbp,
                   ; again best for ease of debugging, but for best performance rbp will not
                   ; be used at all, and local variables would be referenced relative to rsp
                   ; because, apart from the code saving, rbp then is free for other uses.
  …       …        ; However, if rbp is altered here, its value should be preserved for the caller.
 mov [rbp-8], rdx  ; Example of accessing a local variable, from memory location into register rdx

...is functionally equivalent to just:

enter   32, 0

Other instructions for manipulating the stack include pushfd(32-bit) / pushfq(64-bit) and popfd/popfq for storing and retrieving the EFLAGS (32-bit) / RFLAGS (64-bit) register.

Values for a SIMD load or store are assumed to be packed in adjacent positions for the SIMD register and will align them in sequential little-endian order. Some SSE load and store instructions require 16-byte alignment to function properly. The SIMD instruction sets also include "prefetch" instructions which perform the load but do not target any register, used for cache loading. The SSE instruction sets also include non-temporal store instructions which will perform stores straight to memory without performing a cache allocate if the destination is not already cached (otherwise it will behave like a regular store.)

Most generic integer and floating-point (but no SIMD) instructions can use one parameter as a complex address as the second source parameter. Integer instructions can also accept one memory parameter as a destination operand.

Program flow

The x86 assembly has an unconditional jump operation, jmp, which can take an immediate address, a register or an indirect address as a parameter (note that most RISC processors only support a link register or short immediate displacement for jumping).

Also supported are several conditional jumps, including jz (jump on zero), jnz (jump on non-zero), jg (jump on greater than, signed), jl (jump on less than, signed), ja (jump on above/greater than, unsigned), jb (jump on below/less than, unsigned). These conditional operations are based on the state of specific bits in the (E)FLAGS register. Many arithmetic and logic operations set, clear or complement these flags depending on their result. The comparison cmp (compare) and test instructions set the flags as if they had performed a subtraction or a bitwise AND operation, respectively, without altering the values of the operands. There are also instructions such as clc (clear carry flag) and cmc (complement carry flag) which work on the flags directly. Floating point comparisons are performed via fcom or ficom instructions which eventually have to be converted to integer flags.

Each jump operation has three different forms, depending on the size of the operand. A short jump uses an 8-bit signed operand, which is a relative offset from the current instruction. A near jump is similar to a short jump but uses a 16-bit signed operand (in real or protected mode) or a 32-bit signed operand (in 32-bit protected mode only). A far jump is one that uses the full segment base:offset value as an absolute address. There are also indirect and indexed forms of each of these.

In addition to the simple jump operations, there are the call (call a subroutine) and ret (return from subroutine) instructions. Before transferring control to the subroutine, call pushes the segment offset address of the instruction following the call onto the stack; ret pops this value off the stack, and jumps to it, effectively returning the flow of control to that part of the program. In the case of a far call, the segment base is pushed following the offset; far ret pops the offset and then the segment base to return.

There are also two similar instructions, int (interrupt), which saves the current (E)FLAGS register value on the stack, then performs a far call, except that instead of an address, it uses an interrupt vector, an index into a table of interrupt handler addresses. Typically, the interrupt handler saves all other CPU registers it uses, unless they are used to return the result of an operation to the calling program (in software called interrupts). The matching return from interrupt instruction is iret, which restores the flags after returning. Soft Interrupts of the type described above are used by some operating systems for system calls, and can also be used in debugging hard interrupt handlers. Hard interrupts are triggered by external hardware events, and must preserve all register values as the state of the currently executing program is unknown. In Protected Mode, interrupts may be set up by the OS to trigger a task switch, which will automatically save all registers of the active task.

Examples

The following examples use the so-called Intel-syntax flavor as used by the assemblers Microsoft MASM, NASM and many others. (Note: There is also an alternative AT&T-syntax flavor where the order of source and destination operands are swapped, among many other differences.)

"Hello world!" program for MS-DOS in MASM-style assembly

Using the software interrupt 21h instruction to call the MS-DOS operating system for output to the display – other samples use libc's C printf() routine to write to stdout. Note that the first example, is a 30-year-old example using 16-bit mode as on an Intel 8086. The second example is Intel 386 code in 32-bit mode. Modern code will be in 64-bit mode.

.model small
.stack 100h

.data
msg	db	'Hello world!$'

.code
start:
    mov ax, @DATA  ; Initializes Data segment
    mov ds, ax
	mov	ah, 09h    ; Sets 8-bit register ‘ah’, the high byte of register ax, to 9, to
                   ; select a sub-function number of an MS-DOS routine called below
                   ; via the software interrupt int 21h to display a message
	lea	dx, msg    ; Takes the address of msg, stores the address in 16-bit register dx
	int	21h        ; Various MS-DOS routines are callable by the software interrupt 21h
                   ; Our required sub-function was set in register ah above

	mov	ax, 4C00h  ; Sets register ax to the sub-function number for MS-DOS’s software
                   ; interrupt int 21h for the service ‘terminate program’.
	int	21h        ; Calling this MS-DOS service never returns, as it ends the program.

end start

"Hello world!" program for Windows in MASM style assembly

; requires /coff switch on 6.15 and earlier versions
.386
.model small,c
.stack 1000h

.data
msg     db "Hello world!",0

.code
includelib libcmt.lib
includelib libvcruntime.lib
includelib libucrt.lib
includelib legacy_stdio_definitions.lib

extrn printf:near
extrn exit:near

public main
main proc
        push    offset msg
        call    printf
        push    0
        call    exit
main endp

end

"Hello world!" program for Windows in NASM style assembly

; Image base = 0x00400000
%define RVA(x) (x-0x00400000)
section .text
push dword hello
call dword [printf]
push byte +0
call dword [exit]
ret

section .data
hello db "Hello world!"

section .idata
dd RVA(msvcrt_LookupTable)
dd -1
dd 0
dd RVA(msvcrt_string)
dd RVA(msvcrt_imports)
times 5 dd 0 ; ends the descriptor table

msvcrt_string dd "msvcrt.dll", 0
msvcrt_LookupTable:
dd RVA(msvcrt_printf)
dd RVA(msvcrt_exit)
dd 0

msvcrt_imports:
printf dd RVA(msvcrt_printf)
exit dd RVA(msvcrt_exit)
dd 0

msvcrt_printf:
dw 1
dw "printf", 0
msvcrt_exit:
dw 2
dw "exit", 0
dd 0

"Hello world!" program for Linux in its native AT&T style assembly

.data                         ; section for initialized data
str: .ascii "Hello, world!\n" ; define a string of text containing "Hello, world!" and then a new line.
str_len = . - str             ; get the length of str by subtracting its address

.text                         ; section for program functions
.globl _start                 ; export the _start function so it can be run
_start:                       ; begin the _start function
    movl $4, %eax             ; specify the instruction to 'sys_write'
    movl $1, %ebx             ; specify the output to the standard output, 'stdout'
    movl $str, %ecx           ; specify the outputted text to our defined string
    movl $str_len, %edx       ; specify the character amount to write as the length of our defined string.
    int $0x80                 ; call a system interrupt to initiate the syscall we have created.

    movl $1, %eax             ; specify the instruction to 'sys_exit'
    movl $0, %ebx             ; specify the exit code to 0, meaning success
    int $0x80                 ; call another system interrup to end the program

"Hello world!" program for Linux in NASM style assembly

;
; This program runs in 32-bit protected mode.
;  build: nasm -f elf -F stabs name.asm
;  link:  ld -o name name.o
;
; In 64-bit long mode you can use 64-bit registers (e.g. rax instead of eax, rbx instead of ebx, etc.)
; Also change "-f elf " for "-f elf64" in build command.
;
section .data                           ; section for initialized data
str:     db 'Hello world!', 0Ah         ; message string with new-line char at the end (10 decimal)
str_len: equ $ - str                    ; calcs length of string (bytes) by subtracting the str's start address
                                          ; from ‘here, this address’ (‘$’ symbol meaning ‘here’)

section .text                           ; this is the code section (program text) in memory 
global _start                           ; _start is the entry point and needs global scope to be 'seen' by the
                                        ; linker --equivalent to main() in C/C++
_start:                                 ; definition of _start procedure begins here
	mov	eax, 4                   ; specify the sys_write function code (from OS vector table)
	mov	ebx, 1                   ; specify file descriptor stdout --in gnu/linux, everything's treated as a file,
                                 ; even hardware devices
	mov	ecx, str                 ; move start _address_ of string message to ecx register
	mov	edx, str_len             ; move length of message (in bytes)
	int	80h                      ; interrupt kernel to perform the system call we just set up -
                                 ; in gnu/linux services are requested through the kernel
	mov	eax, 1                   ; specify sys_exit function code (from OS vector table)
	mov	ebx, 0                   ; specify return code for OS (zero tells OS everything went fine)
	int	80h                      ; interrupt kernel to perform system call (to exit)

For 64-bit long mode, "lea rcx, str" would be the address of the message, note 64-bit register rcx.

"Hello world!" program for Linux in NASM style assembly using the C standard library

;
;  This program runs in 32-bit protected mode.
;  gcc links the standard-C library by default

;  build: nasm -f elf -F stabs name.asm
;  link:  gcc -o name name.o
;
; In 64-bit long mode you can use 64-bit registers (e.g. rax instead of eax, rbx instead of ebx, etc..)
; Also change "-f elf " for "-f elf64" in build command.
;
        global  main                            ; ‘main’ must be defined, as it being compiled
                                                ; against the C Standard Library
        extern  printf                          ; declares the use of external symbol, as printf
                                                ; printf is declared in a different object-module.
                                                ; The linker resolves this symbol later.

segment .data                                   ; section for initialized data
	string db 'Hello world!', 0Ah, 0            ; message string ending with a newline char (10
                                                ; decimal) and the zero byte ‘NUL’ terminator
                                                ; ‘string’ now refers to the starting address
                                                ; at which 'Hello, World' is stored.

segment .text
main:
        push    string                          ; Push the address of ‘string’ onto the stack.
                                                ; This reduces esp by 4 bytes before storing
                                                ; the 4-byte address ‘string’ into memory at
                                                ; the new esp, the new bottom of the stack.

                                                ; This will be an argument to printf()
        call    printf                          ; calls the C printf() function.
        add     esp, 4                          ; Increases the stack-pointer by 4 to put it back
                                                ; to where it was before the ‘push’, which
                                                ; reduced it by 4 bytes.
        ret                                     ; Return to our caller.

"Hello world!" program for 64-bit mode Linux in NASM style assembly

This example is in modern 64-bit mode.

;  build: nasm -f elf64 -F dwarf hello.asm
;  link:  ld -o hello hello.o

DEFAULT REL			    ; use RIP-relative addressing modes by default, so [foo] = [rel foo]

SECTION .rodata			; read-only data should go in the .rodata section on GNU/Linux, like .rdata on Windows
Hello:		db "Hello world!", 10   ; Ending with a byte 10 = newline (ASCII LF)
len_Hello:	equ $-Hello             ; Get NASM to calculate the length as an assembly-time constant
                                    ; the ‘$’ symbol means ‘here’. write() takes a length so that
                                    ; a zero-terminated C-style string isn't needed.
                                    ; It would be for C puts()

SECTION .rodata			; read-only data can go in the .rodata section on GNU/Linux, like .rdata on Windows
Hello:		db "Hello world!",10        ; 10 = `\n`.
len_Hello:	equ $-Hello                 ; get NASM to calculate the length as an assemble-time constant
;;  write() takes a length so a 0-terminated C-style string isn't needed. It would be for puts

SECTION .text

global _start
_start:
	mov eax, 1				; __NR_write syscall number from Linux asm/unistd_64.h (x86_64)
	mov edi, 1				; int fd = STDOUT_FILENO
	lea rsi, [rel Hello]			; x86-64 uses RIP-relative LEA to put static addresses into regs
	mov rdx, len_Hello		; size_t count = len_Hello
	syscall					; write(1, Hello, len_Hello);  call into the kernel to actually do the system call
     ;; return value in RAX.  RCX and R11 are also overwritten by syscall

	mov eax, 60				; __NR_exit call number (x86_64) is stored in register eax.
	xor edi, edi		    ; This zeros edi and also rdi.
                            ; This xor-self trick is the preferred common idiom for zeroing
                            ; a register, and is always by far the fastest method.
                            ; When a 32-bit value is stored into eg edx, the high bits 63:32 are
                            ; automatically zeroed too in every case. This saves you having to set
                            ; the bits with an extra instruction, as this is a case very commonly
                            ; needed, for an entire 64-bit register to be filled with a 32-bit value.
                            ; This sets our routine’s exit status = 0 (exit normally)
	syscall					; _exit(0)

Running it under strace verifies that no extra system calls are made in the process. The printf version would make many more system calls to initialize libc and do dynamic linking. But this is a static executable because we linked using ld without -pie or any shared libraries; the only instructions that run in user-space are the ones you provide.

$ strace ./hello > /dev/null                    # without a redirect, your program's stdout is mixed with strace's logging on stderr.  Which is normally fine
execve("./hello", ["./hello"], 0x7ffc8b0b3570 /* 51 vars */) = 0
write(1, "Hello world!\n", 13)          = 13
exit(0)                                 = ?
+++ exited with 0 +++

Using the flags register

Flags are heavily used for comparisons in the x86 architecture. When a comparison is made between two data, the CPU sets the relevant flag or flags. Following this, conditional jump instructions can be used to check the flags and branch to code that should run, e.g.:

cmp	eax, ebx
	jne	do_something
	; ...
do_something:
	; do something here

Aside, from compare instructions, there are a great many arithmetic and other instructions that set bits in the flags register. Other examples are the instructions sub, test and add and there are many more. Common combinations such as cmp + conditional jump are internally ‘fused’ (‘macro fusion’) into one single micro-instruction (μ-op) and are fast provided the processor can guess which way the conditional jump will go, jump vs continue.

The flags register are also used in the x86 architecture to turn on and off certain features or execution modes. For example, to disable all maskable interrupts, you can use the instruction:

cli

The flags register can also be directly accessed. The low 8 bits of the flag register can be loaded into ah using the lahf instruction. The entire flags register can also be moved on and off the stack using the instructions pushfd/pushfq, popfd/popfq, int (including into) and iret.

The x87 floating point maths subsystem also has its own independent ‘flags’-type register the fp status word. In the 1990s it was an awkward and slow procedure to access the flag bits in this register, but on modern processors there are ‘compare two floating point values’ instructions that can be used with the normal conditional jump/branch instructions directly without any intervening steps.

Using the instruction pointer register

The instruction pointer is called ip in 16-bit mode, eip in 32-bit mode, and rip in 64-bit mode. The instruction pointer register points to the address of the next instruction that the processor will attempt to execute. It cannot be directly accessed in 16-bit or 32-bit mode, but a sequence like the following can be written to put the address of next_line into eax (32-bit code):

call	next_line
next_line:
	pop	eax

Writing to the instruction pointer is simple — a jmp instruction stores the given target address into the instruction pointer to, so, for example, a sequence like the following will put the contents of rax into rip (64-bit code):

jmp	rax

In 64-bit mode, instructions can reference data relative to the instruction pointer, so there is less need to copy the value of the instruction pointer to another register.

See also

• Assembly language
• X86 instruction listings
• X86 architecture
• CPU design
• List of assemblers
• Self-modifying code
• DOS
• DOS API

Further reading

Manuals

• Intel 64 and IA-32 Software Developer Manuals
• AMD64 Architecture Programmer's Manual (Volume 1-5)

Books

• Ed, Jorgensen (May 2018). x86-64 Assembly Language Programming with Ubuntu (1.0.97 ed.). pp. 367. http://www.egr.unlv.edu/~ed/assembly64.pdf.