程序集读取用户输入不等待

Question

我有一个汇编程序应该写"What's your name?"，然后等待用户输入，然后打印"Hello, "。这是我的程序(Mac, nasm):

section .data
 question db "What's your name?"
 answer db "Hello, "
 ln db 10

section .bss
 name resb 16

section .text
global start 
start:
 mov rsi, question
 mov rdi, 17
 call print
 call getName
 mov rsi, answer
 mov rdi, 7
 call print
 mov rsi, ln
 mov rdi, 1
 call print
 mov rax, 0x02000001
 mov rdi, 0
 syscall

print:
 mov rax, 0x02000004
 mov rdi, 1
 syscall
 ret
getName:
 mov rax, 0x02000003
 mov rdi, 0
 mov rsi, name
 mov rdx, 16
 syscall
 ret

但是这个程序写 "What's your name?Hello," 然后才等待用户输入。为什么它在写入 "Hello," 之前不等待输入？

Answer 1

我在开始时混淆了 rdx 和 rdi，忘记打印名字了。我的错。编辑：出于某种原因我不能接受这个答案，所以：这是公认的答案！

Answer 2

您的代码完全错误。注册 RAX 必须是服务系统调用的值。我会帮你更正完整程序的代码。

编译它：

nasm -f elf64 -o objname.o sourcecode.asm

ld -m elf_x86_64 -o execname objname.o

%macro print 2
mov rax,1
mov rdi,rax
mov rsi,%1
mov rdx,%2
syscall
%endmacro

%macro getinput 2
mov rax,0
mov rdi,rax
mov rsi,%1
mov rdx,%2
syscall
%endmacro

%macro exit 0
mov rax,60
xor rdi,rdi
syscall
%endmacro

section .data
 question db "What's your name?"
lenques equ $-question
 answer db "Hello, "
lenans equ $-answer
 ln db 10
lenname equ 30

section .bss
 name resb lenname

section .text
global _start
_start:
print question,lenques
push rax
getinput name,lenname
print answer,lenans
pop rbx
print name,rbx
print ln,1
exit

程序集读取用户输入不等待

Assembly read user input doesn't wait

macos

assembly

input

nasm

wait