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18 Feb 2017 This reference is intended to be precise opcode and instruction set reference (including x86-64). Its principal aim is exact definition of instruction parameters and attributes.
Usually executes next sequential instruction in memory. - Branch/jump/call inst. Review of x86 assembly. • Mostly two operand equivalent pushl %eax subl $4,%esp movl %eax,(%esp) popl %eax movl (%esp),%eax addl $4,%esp. • Other stack instructions: pushfl, pushal. - leave means: movl %ebp,%esp; popl %ebp
Opcode, Mnemonic, Description. FF /6, PUSH r/m16, Push r/m16. FF /6, PUSH r/m32, Push r/m32. 50+rw, PUSH r16, Push r16. 50+rd, PUSH r32, Push r32. 6A, PUSH imm8, Push imm8. 68, PUSH imm16, Push imm16. 68, PUSH imm32, Push imm32. 0E, PUSH CS, Push CS. 16, PUSH SS, Push SS. 1E, PUSH DS, Push DS.
hi can anybody tell me what assembly instruction "pushl %ds" will do on i386 machines?? because ds is of 2bytes, and "pushl" stands for long, then what will happen exactly after this instruction. Will it push 2 or 4 bytes?? Regards Mehul
As it says about push esp in Intel® 64 and IA-32 Architectures Developer's Manual: Combined Volumes: The PUSH ESP instruction pushes the value of the ESP register as it existed before the instruction was executed. If a PUSH instruction uses a memory operand in which the ESP register is used for
The push instruction places its operand onto the top of the hardware supported stack in memory. Specifically, push first decrements ESP by 4, then places its operand into the contents of the 32-bit location at address [ESP]. ESP (the stack pointer) is decremented by push since the x86 stack grows
x86 Assembly GAS assembly instructions are generally suffixed with the letters "b", "s", "w", "l", "q" or "t" to determine what size operand is being manipulated. . .text LC0: .ascii "Hello, world!12" .globl _main _main: pushl %ebp movl %esp, %ebp subl $8, %esp andl $-16, %esp movl $0, %eax movl %eax, -4(%ebp) movl
The GNU Assembler, gas, uses a different syntax from what you will likely find in any x86 reference manual, and the two-operand instructions have the source and destinations in the opposite order. Here are the types of the gas instructions: opcode (e.g., pushal) opcode operand (e.g., pushl %edx) opcode source,dest (e.g.,
11 Nov 2015 Description. The cmp instruction is used to perform comparison. It's identical to the sub instruction except it does not affect operands. It impacts the Zero Flag (ZF) as well as the Carry Flag (CF) as follows: cmp dst, src, ZF, CF. dst = src, 1, 0. dst < src, 0, 1. dst > src, 0, 0. Syntax. cmp destination, source
Opcode*, Instruction, Op/En, 64-Bit Mode, Compat/Leg Mode, Description. FF /6, PUSH r/m16, M, Valid, Valid, Push r/m16. FF /6, PUSH r/m32, M, N.E., Valid, Push r/m32. FF /6, PUSH r/m64, M, Valid, N.E., Push r/m64. 50+rw, PUSH r16, O, Valid, Valid, Push r16. 50+rd, PUSH r32, O, N.E., Valid, Push r32. 50+rd, PUSH r64
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