== code 0x80000000
# repeatedly print "Hi\n"
# main:
# load 0x10010000 (UART0) into t0
b7 02 01 10
# store 0x48 (H) in UART0+0
13 03 80 04
23 a0 62 00
# store 0x69 (i) in UART0+0
13 03 90 06
23 a0 62 00
# store 0x0a (\n) in UART0+0
13 03 a0 00
23 a0 62 00
# jump back up to the top (three versions):
# a) jal 21bit relative (with 0th bit forced to 0)
#   6f/jal 0/rd/x0 main/off21
# b) auipc+jalr 32bit relative (note label offset)
97 f3 ff ff
67 80 43 fe
# c) lui+jalr 32bit absolute
#   37/lui 7/rd/t2 main/imm32
#   67/jalr 0/subop 0/rd/x0 7/rs/t2 main/imm32