assembly

问题 I have got 3 Arrays under the data label (ArrayA, ArrayB, ArrayC) , each having 16 bytes. I've already written the program that goes through it row by row and adds each row of A with each row of B and then saves the result to the same row of array C . I want to add a breakpoint just before the program stops executing and then print the memory from [=ArrayC] up to [=ArrayC] + 15 , byte by byte, once in hex and once in decimal. How is that possible? 回答1: x/16xb &ArrayC for hexadecimal and x

问题 I have got 3 Arrays under the data label (ArrayA, ArrayB, ArrayC) , each having 16 bytes. I've already written the program that goes through it row by row and adds each row of A with each row of B and then saves the result to the same row of array C . I want to add a breakpoint just before the program stops executing and then print the memory from [=ArrayC] up to [=ArrayC] + 15 , byte by byte, once in hex and once in decimal. How is that possible? 回答1: x/16xb &ArrayC for hexadecimal and x

问题 I'm trying to learn how to use linux 64bits syscall in assembly. I was writing some code for reading keyboard and simply print it on screen the pressed keys: i'm using sys_read. The code: section .text global _start _start: ;write startmsg mov rax, 1 mov rdi, 1 mov rsi, startmsg mov rdx, sizestart syscall ;using sys_read mov ax, 0 mov rdi, 0 mov rsi, key mov rdx, 2 syscall ;trying to see if esc is pressed then exit mov rbx, 0x1b cmp rbx, key je _exit _exit: mov rax, 60 mov rdi, 0 syscall

问题 I'm trying to learn how to use linux 64bits syscall in assembly. I was writing some code for reading keyboard and simply print it on screen the pressed keys: i'm using sys_read. The code: section .text global _start _start: ;write startmsg mov rax, 1 mov rdi, 1 mov rsi, startmsg mov rdx, sizestart syscall ;using sys_read mov ax, 0 mov rdi, 0 mov rsi, key mov rdx, 2 syscall ;trying to see if esc is pressed then exit mov rbx, 0x1b cmp rbx, key je _exit _exit: mov rax, 60 mov rdi, 0 syscall

问题 This question already has answers here : Converting 16-bit DOS .com assembly for use on 64-bit (1 answer) 16-bit Assembly on 64-bit Windows? (3 answers) How to write hello world in assembler under Windows? (8 answers) Closed 2 years ago . This code will print "Hello, world!" in DOS as a .COM executable: org 100h mov dx,msg mov ah,9 int 21h mov ah,4Ch int 21h msg db 'Hello, world!',0Dh,0Ah,'$' However it will not run on Windows 10 64-bit and all trivial examples of a Helloworld program for x86

问题 I've written a program in assembly (at&t syntax) and I want to see how the machine code looks. This is how I get executable code: as -g -o p1.o p1.s --32 -gstabs ld -o p1 p1.o -m elf_i386 回答1: Assuming that you are on a Linux or BSD platform (based on the fact that you're using as ), you might want to try objdump . objdump -d <binary file> will disassemble the object file, showing you machine code hex bytes on the left and the disassembled matching assembly mnemonics on the right. Here's an

问题 I've written a program in assembly (at&t syntax) and I want to see how the machine code looks. This is how I get executable code: as -g -o p1.o p1.s --32 -gstabs ld -o p1 p1.o -m elf_i386 回答1: Assuming that you are on a Linux or BSD platform (based on the fact that you're using as ), you might want to try objdump . objdump -d <binary file> will disassemble the object file, showing you machine code hex bytes on the left and the disassembled matching assembly mnemonics on the right. Here's an

问题 I am currently learning x86 assembly. Something is not clear to me still however when using the stack for function calls. I understand that the call instruction will involve pushing the return address on the stack and then load the program counter with the address of the function to call. The ret instruction will load this address back to the program counter. My confusion is, does it matter when the ret instruction is called within the procedure/function? Will it always find the correct

问题 I have a trouble with a compiling assembly code (nasm). On Linux (elf32) it not fails after compilation using g++, but when I tried to build it with i686-w64-mingw32-g++ (for Win32) it failed. My build.sh script: #!/bin/bash nasm -fwin32 wct.asm i686-w64-mingw32-g++ -m32 -O2 -Wall -fno-exceptions -ffloat-store -ffast-math -fno-rounding-math -fno-signaling-nans -fcx-limited-range -fno-math-errno -funsafe-math-optimizations -fassociative-math -freciprocal-math -ffinite-math-only -fno-signed

问题 This question already has answers here : Issue storing a byte into a register x86-64 assembly (1 answer) Why can't I move directly a byte to a 64 bit register? (2 answers) Closed 2 years ago . Here is what i want to do: add rsi, word [rsi+16] I want to read the unsigned short value which is at rsi+16 adress. And i want to add this value to rsi. Here is the error i get in nasm: s2.asm:62: error: mismatch in operand sizes This is strange. Why nasm and my cpu are not able to add 16 bits to 64