Microbit runtime

Bibliography

Writing a VM

• https://azeria-labs.com/writing-arm-assembly-part-1/
• https://medium.com/@shan1024/writing-a-simple-vm-in-80-lines-of-code-4fe0e949a0d9
• https://hardwarebee.com/step-by-step-guide-to-microcontroller-programming/

Microbit official resources

• https://tech.microbit.org/software/runtime/
• https://tech.microbit.org/software/hex-format/
• https://tech.microbit.org/software/spec-universal-hex/
• https://github.com/lancaster-university/microbit-dal/
• https://github.com/lancaster-university/microbit-samples

Useful commands

Compile from A&AT ASM

as assembly.s --32 -o assembly.o
ld -m elf_i386 -dynamic-linker /lib/ld-linux.so.2 -o assembly -lc assembly.o

Compile from c to binary

arm-linux-gnueabihf-gcc -mbe32 -march=armv6 -marm helloworld.c -o helloworld

Compile from c to ASM

arm-linux-gnueabihf-gcc -mbe32 -march=armv6 -marm helloworld.c -S

Disassemble program

arm-linux-gnueabihf-objdump -drwC helloworld

better disassemble I guess

arm-linux-gnueabihf-objdump -D -bbinary -marm helloworld -Mforce-thumb