作者:346182773_20da31 | 来源:互联网 | 2023-09-13 14:03
最近再看《Orange‘s一个操作系统的实现》,里面用的是intel的汇编语法,自己比较习惯AT&T的语法了,自己研究了好长时间才将代码修改成功。
- .code16
- .section.text
- .globl_start
- _start:
- movw%cs,%ax
- movw%ax,%ds
- movw%ax,%es
- callDispStr
- loop1:jmploop1
- DispStr:
- movw$BootMessage,%ax
- movw%ax,%bp
- movw$0x10,%cx
- movw$0x1301,%ax
- movw$0xc,%bx
- movb$0,%dl
- int$0x10
- ret
- BootMessage:.ascii "Hello, OS world!"
- .org510
- .word0xAA55
.code16指示as生成16位的代码。While `as' normally writes only "pure" 32-bit i386 code or 64-bit x86-64 code depending on the default configuration, it also supports writing code to run in real mode or in 16-bit protected mode code segment.
编译的话 as -o boot.o boot.s ;
ld -Ttext=0x7c00 --oformat binary -o boot.bin boot.o;
这样就ok了~~