kvisc/vm/in/MEM

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

#---------------------------------------------------------------------------#
# Stack manipulation instructions                                           #
#---------------------------------------------------------------------------#

#
# Unconditional jump with possible return (CALL)
#
#       PUSH(EIP)
#       JMP(EIP)
#
call 1
call 2
call 3

#
# Return to caller (RET)
#
#       POP(EIP)
#
ret 0
ret 1

#
# Make new stack frame (ENTER)
#
#       PUSH(EBP)
#       EBP = ESP
#       ESP = ESP - $1
#
enter 0
enter 1
enter 2

#
# Leave stack frame (LEAVE)
#
#       ESP = EBP
#       POP(EBP)
#
leave 0

#
# PUSH value onto stack
#
#       ESP = ESP - 8
#       *ESP = $1
#
push 1
push 2
push 3

#
# POP value from stack
#
#       $1 = *ESP
#       ESP = ESP + 8
#
pop 0
pop 1
pop 2

#---------------------------------------------------------------------------#
# Movement instructions                                                     #
#---------------------------------------------------------------------------#

nul 1
nul 2

#
# Load Effective Address (LEA) instruction
#
#       $1 = ADDR($2)
#
# For instance:
#       LEA EAX, [EBX + ECX * 2 + 4]
# will result in:
#       EAX = EBX + ECX * 2 + 4
#
lea 2

#
# Move data (MOV/MOVU) instructions
#
#       $1 = SignExtend($2)     (MOV)
#       $1 = ZeroExtend($2)     (MOVU)
#
mov 2
movzx 2

#
# Move with sign-extension (MOVx) instruction
#
#       $1 = SignExtend($2 & (2^(8 * sizeof(x)) - 1)
#
movb 2
movw 2
movd 2

#
# Exchange (XCHG) instruction
#
#       $_ = $1
#       $1 = $2
#       $2 = $_
#
xchg 2