read_in_shellcode.vm

# read in one byte that's how much they want to write
# then shellcode
# shellcode will be loaded at address 100, and stack will be at 3000
# reset the stack
imm s 4092
imm b 0
stk 0 b
add b s

# len in c
imm c 2

# fd in a
imm a 0

sys read a

# read it all into address 100, then jump there

# num to read is in c
ldm c b

imm b 100

imm a 0
sys read a

# change stack to be at 3000
imm s 3000

# jump to 100
imm a 100
jmp 0 a