小编Nic*_*k_h的帖子

我在 NASM 中有以下“uppercaser.asm”汇编程序，它将用户输入的所有小写字母转换为大写：

section .bss
    Buff resb 1

section .data

section .text
        global _start

_start:
        nop            ; This no-op keeps the debugger happy

Read:   mov eax,3      ; Specify sys_read call
        mov ebx,0      ; Specify File Descriptor 0: Standard Input
        mov ecx,Buff   ; Pass offset of the buffer to read to
        mov edx,1      ; Tell sys_read to read one char from stdin
        int 80h        ; Call sys_read

        cmp eax,0       ; Look at sys_read's return value in EAX
        je Exit         ; Jump …