Skip to content

Latest commit

 

History

History
76 lines (61 loc) · 3.14 KB

Ex__7_hello_arm64.md

File metadata and controls

76 lines (61 loc) · 3.14 KB
Raw

Modern Computer Architecture and Organization Second Edition, by Jim Ledin. Published by Packt Publishing.

Chapter 10, Exercise 7

Locate the following files under the Android SDK installation directory (the default location is under %LOCALAPPDATA%\Android) and add their directories to your PATH environment variable: aarch64-linux-android-as.exe and adb.exe. Hint: The following command works for one version of Android Studio (your path may vary):

set PATH=%PATH%;%LOCALAPPDATA%\Android\Sdk\ndk\23.0.7599858\toolchains\llvm\prebuilt\windows-x86_64\bin;%LOCALAPPDATA%\Android\Sdk\platform-tools

Create a file name hello_arm64.s with the content shown in the source listing in the 64-bit ARM assembly language section of this chapter.

Build the program using the commands shown in the 64-bit ARM assembly language section of this chapter.

Enable Developer Options on an Android phone or tablet.

Connect your Android device to the computer with a USB cable.

Copy the program executable image to the phone using the commands shown in the 64-bit ARM assembly language section of this chapter and run the program. Verify the output Hello, Computer Architect! appears on the host computer screen.

Disable Developer Options on your Android phone or tablet..

Answer

Create your assembly language source file. See Ex__7_hello_arm64.s for an example solution to this exercise.

Build the executable with these commands:

aarch64-linux-android-as -al=Ex__7_hello_arm64.lst -o Ex__7_hello_arm64.o Ex__7_hello_arm64.s
aarch64-linux-android-ld -o Ex__7_hello_arm64 Ex__7_hello_arm64.o

This is the output produced by copying the program to an Android device and running it:

C:\>adb devices
* daemon not running; starting now at tcp:5037
* daemon started successfully
List of devices attached
9826f541374f4b4a68      device


C:\>adb push Ex__7_hello_arm64 /data/local/tmp/Ex__7_hello_arm64
Ex__7_hello_arm64: 1 file pushed. 0.0 MB/s (1152 bytes in 0.029s)

C:\>adb shell chmod +x /data/local/tmp/Ex__7_hello_arm64
C:\>adb shell /data/local/tmp/Ex__7_hello_arm64
Hello, Computer Architect!

This is the listing file created by the build procedure:

AARCH64 GAS  Ex__7_hello_arm64.s 			page 1


   1              	.text
   2              	.global _start
   3              	
   4              	_start:
   5              	    // Print the message to file 1 (stdout) with syscall 64
   6 0000 200080D2 	    mov     x0, #1
   7 0004 E1000058 	    ldr     x1, =msg
   8 0008 420380D2 	    mov     x2, #msg_len
   9 000c 080880D2 	    mov     x8, #64
  10 0010 010000D4 	    svc     0
  11              	
  12              	    // Exit the program with syscall 93, returning status 0
  13 0014 000080D2 	    mov     x0, #0
  14 0018 A80B80D2 	    mov     x8, #93
  15 001c 010000D4 	    svc     0
  16              	    
  17              	.data
  18              	msg:
  19 0000 48656C6C 	    .ascii      "Hello, Computer Architect!"
  19      6F2C2043 
  19      6F6D7075 
  19      74657220 
  19      41726368 
  20              	msg_len = . - msg

Don't forget to disable Developer Options on your Android phone or tablet..