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标题: 用ADS汇编怎样实现打开一个文本的编程阿 [打印本页]

作者: liujianyong9 时间: 2006-4-24 16:13 标题: 用ADS汇编怎样实现打开一个文本的编程阿

我是一个初学者，有没有人知道，怎样用用ADS汇编怎样实现打开一个文本的编程阿，有高手吗？用到SWI

下面是问题：

Refer to the ARM System Calls document and read about the following system calls:fficeffice" />

SWI_Open, SWI_Flen, SWI_Read, SWI_Write. An example is given to show how you can write a short file on disk. Write a program to open the file turing.txt, and print its content on the screen. (More system calls information on http://www.arm.com, look for ADS 1.2 Debugger Target Guide) Two examples of system calls are attached at the end of this assignment specification. (One is outputting string to the debugger console, one is writing string to a file on the host debugger (PC).

例如：

AREA Hello_Word, CODE, READONLY ; name this block of code

; function ID codes to be put into r0

SWI_WriteC EQU 0x03 ;output character address in r1

SWI_Exit EQU 0x18 ;finish program

SWI_FUN EQU 0x123456

ENTRY ;code entry point

START LDR r1,=TEXT

SUB r1,r1,#1

LDR r0, = SWI_WriteC

ffice:smarttags" />LOOP ADD r1,r1,#1

LDRB r2, [r1]

CMP r2, #0

SWINE SWI_FUN

BNE LOOP

LDR r0, = SWI_Exit

SWI SWI_FUN

TEXT DCB "Hello World!", &0a, &0d, 0 ; string + CR + LF + null

END

作者: linuxarm 时间: 2006-4-25 17:17

这个倒还真没有试过... ...

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