Question

SECTION .data       ; data section
msg:    db "Hello World",10 ; the string to print, 10=cr
test:   db "test",10
len:    equ $-msg       ; "$" means "here"
                ; len is a value, not an address

    SECTION .text       ; code section
        global main     ; make label available to linker 
main:               ; standard  gcc  entry point

    mov edx,len     ; arg3, length of string to print
    mov ecx,msg     ; arg2, pointer to string
    mov ebx,1       ; arg1, where to write, screen
    mov eax,4       ; write sysout command to int 80 hex
    int 0x80        ; interrupt 80 hex, call kernel

    mov ebx,0       ; exit code, 0=normal
    mov eax,1       ; exit command to kernel
    int 0x80        ; interrupt 80 hex, call kernel

初学者的问题，但是为什么此代码会打印“ Hello word test”，只希望打印出味精，所以您好，世界？”

我以此方式构建

nasm -f elf -g test.asm
gcc -m32 -g -o file test.o

nasm变量声明连接其他变量

0 个答案: