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Ex__5_hello_arm.md

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

Chapter 10, Exercise 5

Install the free Android Studio integrated development environment, available at https://developer.android.com/studio/. After installation is complete, open the Android Studio IDE and select SDK Manager under the Tools menu. Select the SDK Tools tab and check the NDK option, which may say NDK (Side by side). Complete the installation of the NDK (NDK means native development kit).

Locate the following files under the SDK installation directory (the default location is under %LOCALAPPDATA%\Android) and add their directories to your PATH environment variable: arm-linux-androideabi-as.exe and adb.exe. Hint: The following command works for one specific 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_arm.s with the content shown in the source listing in the 32-bit ARM assembly language section of this chapter.

Build the program using the commands shown in the 32-bit ARM assembly language section of this chapter.

Enable Developer Options on an Android phone or tablet. Search the Internet for instructions on how to do this.

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 32-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__5_hello_arm.s for an example solution to this exercise.

Build the executable with these commands:

arm-linux-androideabi-as -al=Ex__5_hello_arm.lst -o Ex__5_hello_arm.o Ex__5_hello_arm.s
arm-linux-androideabi-ld -o Ex__5_hello_arm Ex__5_hello_arm.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__5_hello_arm /data/local/tmp/Ex__5_hello_arm
Ex__5_hello_arm: 1 file pushed. 0.0 MB/s (868 bytes in 0.059s)

C:\>adb shell chmod +x /data/local/tmp/Ex__5_hello_arm
C:\>adb shell /data/local/tmp/Ex__5_hello_arm
Hello, Computer Architect!

This is the listing file created by the build procedure:

ARM GAS  Ex__5_hello_arm.s 			page 1


   1              	.text
   2              	.global _start
   3              	
   4              	_start:
   5              	    // Print the message to file 1 (stdout) with syscall 4
   6 0000 0100A0E3 	    mov     r0, #1
   7 0004 14109FE5 	    ldr     r1, =msg
   8 0008 1A20A0E3 	    mov     r2, #msg_len
   9 000c 0470A0E3 	    mov     r7, #4
  10 0010 000000EF 	    svc     0
  11              	
  12              	    // Exit the program with syscall 1, returning status 0
  13 0014 0000A0E3 	    mov     r0, #0
  14 0018 0170A0E3 	    mov     r7, #1
  15 001c 000000EF 	    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..