kvisc/vm/in/MISC

# The OS/K Team licenses this file to you under the MIT license.
# See the LICENSE file in the project root for more information.

#---------------------------------------------------------------------------#
# Debugging instructions                                                    #
#---------------------------------------------------------------------------#

#
# Breakpoint instruction (BREAK)
#
#       (cause register dump on standard error)
#       (wait for user input before proceeeding)
#
break

#
# Toggles instruction dumping (DUMP)
#
#       (toggles instruction dumping)
#
dump

#---------------------------------------------------------------------------#
# Misc. instructions                                                        #
#---------------------------------------------------------------------------#

#
# Throws #UDF ("undefined behaviour")
#
udf

#
# Pause the CPU for a very short amount of time (PAUSE)
# Used in spin-type loops
#
pause

#
# Throw #OVF when RFX.OF=1 (INTO)
#
into

#
# Get timestamp in µseconds
#
utime 2

#
# $1 = seconds since start of month
# $2 = current month
# $3 = current year
#
ytime 3

#
# Clear all GPR registers except RBP/RSP
#
cls

#---------------------------------------------------------------------------#
# Byte-wise / bit-wise manipulation instructions                            #
#---------------------------------------------------------------------------#

#
# Byte/word/dword swap (xSWAP)
#
# Change endianness
#
bswap 2
wswap 2
dswap 2

#---------------------------------------------------------------------------#
# I/O instructions                                                          #
#---------------------------------------------------------------------------#

#
# Send a character to standard output (PRN)
#
prn 1

#
# Print a string to standard output (PRN)
#
#       COMPARE([%1], 0)
#
#       IF (ZF == 0) THEN
#           PRN([%1])
#           IF (DF == 0) THEN
#               %1 = %1 + 1
#           ELSE
#               %1 = %1 - 1
#           FI
#       FI
#       
#
prns 1

#
# Scan a character from standard input (SCAN)
#
scan 1