Say it louder

Print every command-line argument in capitals, one per line, each followed by !. With quiet please in the args box the program prints QUIET! and then PLEASE!. Check always uses quiet please, whatever the box holds.

main receives the argument count in w0argument and return register (x0-x7): carries the first eight arguments and the return value. and the address of argv, an array of 8-byte pointers to strings, in x1argument and return register (x0-x7): carries the first eight arguments and the return value.. Entry 0 is the program's own name, so start at entry 1. With no arguments the program prints nothing at all.

Walk each argument's bytes with ldrbLoad byte into Wt. until the terminating zero. Only the bytes from 'a' to 'z' change: in ASCII each lower-case letter sits exactly 32 above its capital. Digits, punctuation, and letters that are already capitals stay as they are. You can write each changed byte back into the argument with strbStore low byte of Wt. and then print the whole string with the format in .data.

What is checked

• the shouted lines for quiet please and for more arguments you cannot see
• the program exits cleanly
• the bytes are read one at a time (ldrbLoad byte into Wt.)