sudo apt install binutils-arm-none-eabi
sudo apt install qemu-system-arm
arm-none-eabi-as add.s
none refers to baremetal, i.e. no operating system
qemu-system-arm -M sx1 -kernel a.out -nographic -serial pty
View all Registers:
info registers
Examine 4 RAM Address from:
x /4i 0x10010034
Program Usually Starts on 0x10010034
(qemu) q
type q.
https://en.wikipedia.org/wiki/ARM_architecture#Registers
https://developer.arm.com/docs/100166_0001/latest/programmers-model/processor-core-register-summary
https://developer.arm.com/docs/dui0801/latest/overview-of-aarch32-state/registers-in-aarch32-state
For detailed debugging see GDB:
https://github.com/EN10/arm-as/blob/master/GDB.md
@ is an arm single line comment like ' in VB.NET
/* */ is used for multiline comments like in C
Source must end with newline otherwise:
Assembler end of file Warning
Infinite loop needed at the end otherwise:
qemu: fatal: Trying to execute code outside RAM
-o flag can be used to specify output name
arm-none-eabi-as -o ADD.o ADD.s
AQA ARM:
http://filestore.aqa.org.uk/resources/computing/AQA-75162-75172-ALI.PDF
Instructions Examples:
- ADD
- SUB
- AND
- LSL
- CMP
- IfElse