Recent questions tagged Assembly

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I'm trying to figure out how to use scanf to get user input. I know to use printf: all I have to do is ... the placed at the address of "input." See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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assembly - What is the difference between the ADC and ADCX instructions on ia32/ia64?

I was looking through the Intel software developer manual when I encountered the ADCX instruction, which was ... to the instruction repertoire. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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assembly - Translation from NASM to GAS

how do I translate mov [ebx], al from NASM to GAS? I tried mov %al, (%ebx) but it does segmentatiob fault. ... ? Any answer would be helpful :) See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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assembly - Does Program Counter hold current address or the address of the next instruction?

Being a beginner and self-learner, I am learning assembly and currently reading the chapter 3 of the book, The C ... bytes at the same time? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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assembly - How can I pass parameters in assembler x86 function call?

Look at this assembler code. It is designed for 32 bits x86 and will be compiled by nasm ... ... for fetching my function parameters ? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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assembly - How to switch off LLVM's integrated assembler?

I have a project involving hand-written assembly-AT&T syntax, works fine with GCC, but not done by me plus I ... there's a documented approach.) See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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assembly - Is it possible to use both 64 bit and 32 bit instructions in the same executable in 64 bit Linux?

A 64 bit CPU (amd64) supports 32 bit Intel instructions in the compatibility mode. Also, a 64 bit Linux installation ... any use-cases for it. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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assembly - What use is the INVD instruction?

The x86 INVD invalidates the cache hierarchy without writing the contents back to memory, apparently. I'm curious, ... held in memory anymore. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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assembly - Printing an Int (or Int to String)

I am looking for a way to print an integer in assembler (the compiler I am using is NASM on Linux), ... one of my first assembler programs). See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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assembly resolution - How do I reference assemblies outside the bin folder in an ASP.net application?

I've a working XML Web service written in ASP.Net. Now I need to reference certain assemblies lying in a ... or install it into the GAC See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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assembly - Why is the stack filled with 0xCCCCCCCC

I'm currently disassembling some small C programs made in Visual Studio 2012 Express, and i've noticed a trend ... logic behind it. Thank you. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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assembly - Long multi-byte NOPs: commonly understood macros or other notation

It's not a big secret that x86 (and x86_64) processors have not only the single-byte NOP instruction, but also ... does NOPL do in x86 system? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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assembly - MASM/NASM Differences

What are the syntax differences between the NASM and MASM assemblers? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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assembly - Why do the INC and DEC instructions *not* affect the Carry Flag (CF)?

Why do the x86 instruction INC (increment) and DEC (decrement) not affect the CF (carry flag) in FLAGSREGISTER? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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assembly - What is the x86 "ret" instruction equivalent to?

Say I'm writing a routine in x86 assembly, like, "add" which adds two numbers passed as arguments. For the ... it produce the exact same result? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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assembly - Why should code be aligned to even-address boundaries on x86?

I am working through Kip Irvine's "Assembly Language for x86 Processors, sixth edition" and am really enjoying it. ... to imply ? Thanks, Scott See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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assembly - Significant FMA performance anomaly experienced in the Intel Broadwell processor

Code1: vzeroall mov rcx, 1000000 startLabel1: vfmadd231ps ymm0, ymm0, ymm0 vfmadd231ps ymm1, ymm1, ymm1 ... 1000001 Code2: 5000072 5000072 17000001 5000010 5000014 4999978 1000002...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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assembly - LEA or ADD instruction?

When I'm handwriting assembly, I generally choose the form lea eax, [eax+4] Over the form.. add eax, 4 ... the latter form over the former? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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assembly - How to interpret objdump disassembly output columns?

I wrote a simple program in c which calls a function called while_loop with arguments 4,3,2. The ... absolute memory addresses or relative? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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assembly - multiply two 32-bit numbers to get a 64-bit number, on a 8086 (32x32 => 64-bit with 16-bit multiplies)

How can i Multiply two 32bit digits in assembly or one 32bit another 16bit, anyone knows the algorithm ? data1 ... 32bit mov ax,data2 Mul data1 See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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672 views

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assembly - 16 bit animation - getting started

Took a while but finally got to square 1 in 16 bit graphics. Here I clear the screen and draw a single ... musicalglass/KAOS KAOS The no BS OS See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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assembly - gdb behaves differently for symbols in the .bss, vs. symbols in .data

I recently started learning assembly language for the Intel x86-64 architecture using YASM. While solving one of the tasks ... the OP's asm!). See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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assembly - How to print colored string in DOS?

I want to print the below set of datablock(s) in a different color other than the usual white text color which can be ... 25 26 27 28 29 30 31$" See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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assembly - Illegal use of register in indirect addressing

I'm trying to write a subroutine that adds two large numbers in x86 assembly (MASM). The numbers are pointed at ... the syntax that I'm using? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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assembly - How to convert string to number in Tasm?

I made a program that reads a string and converts it into a number. A string representation of the number ... int 21h code ends end start See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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764 views

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assembly - How does a computer distinguish between Data and Instructions?

I watched a video on an 8-bit pc being fed a program - manually, using physics switches. The fed program ... addresses 12 and 14 are undefined. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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756 views

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assembly - imulq and unsigned long long overflow detection in C and asm

As somebody new to assembly, I use gcc for reverse engineering. But now I ran in a somehow funny problem: I try ... (in assembly) in this case? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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assembly - Why do we even need assembler when we have compiler?

If compiler converts high-level language to machine code, why do we even need assembler? Are there any assembly ... t use compiler for that? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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