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#!/usr/bin/tclsh
# Part of MCU 8051 IDE ( http://https://sourceforge.net/projects/mcu8051ide/ )
############################################################################
# Copyright (C) 2007, 2008, 2009, 2010, 2011, 2012 by Martin Ošmera #
# martin.osmera@gmail.com #
# #
# Copyright (C) 2014 by Moravia Microsystems, s.r.o. #
# martin.osmera@gmail.com #
# #
# This program is free software; you can redistribute it and#or modify #
# it under the terms of the GNU General Public License as published by #
# the Free Software Foundation; either version 2 of the License, or #
# (at your option) any later version. #
# #
# This program is distributed in the hope that it will be useful, #
# but WITHOUT ANY WARRANTY; without even the implied warranty of #
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the #
# GNU General Public License for more details. #
# #
# You should have received a copy of the GNU General Public License #
# along with this program; if not, write to the #
# Free Software Foundation, Inc., #
# 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. #
############################################################################
# >>> File inclusion guard
if { ! [ info exists _ENGINE_BACKWARD_STEPPING_TCL ] } {
set _ENGINE_BACKWARD_STEPPING_TCL _
# <<< File inclusion guard
# --------------------------------------------------------------------------
# DESCRIPTION
# Part of simulator engine functionality.
#
# --------------------------------------------------------------------------
# BACKWARD STEPPING RELATED PROCEDURES
# --------------------------------------------------------------------------
## Save current value of the given register for purpose of stepback operation
# This function does not check for address validity !
# @parm Char mem - Memory type (one of {I E X S P})
# @parm Int addr - Register address
# @return void
private method stepback_reg_change {mem addr} {
if {!$stepback_ena} {return}
if {[lsearch $stepback_local_regs $addr] != -1} {
return
}
lappend stepback_local_regs $addr
switch -- $mem {
{I} {set val $ram($addr) }
{E} {set val $eram($addr) }
{X} {set val $xram($addr) }
{S} {set val $sfr($addr) }
{P} {set val $eeprom($addr) }
}
lappend stepback_local [list $mem $addr $val]
}
## Save local stepback stack to global stepback stack
# This function should be called after each instrucion
# @return void
private method stepback_save_norm {} {
if {!$stepback_ena} {return}
lappend stepback_normal $stepback_local
set stepback_local_regs {}
set stepback_local {}
}
## Save special engine configuration variables for purpose of stepback operation
# This function should be called before each instrucion
# @return void
private method stepback_save_spec {} {
if {!$stepback_ena} {return}
incr stepback_length
set discard [expr {$stepback_length - ${::Simulator::reverse_run_steps}}]
if {$discard > 0} {
incr stepback_length -$discard
set stepback_spec [lreplace $stepback_spec 0 0]
set stepback_normal [lreplace $stepback_normal 0 0]
}
lappend stepback_spec [simulator_get_special]
}
## Set the last list element in stepback to current time
# @return void
private method stepback_save_spec_time {} {
lset stepback_spec {end end} $time
}
## Set "subprog" value for stepback function.
# This is important for list of subprograms and stack monitor
# @parm Int action -
# 6 - Instruction POP peformed
# 5 - Instruction PUSH performed
# 4 - Return from subprogram
# 3 - Return from interrupt routine
# 2 - Invocaton of subprogram
# 1 - Invocaton of interrupt
# 0 - Nothing mentioned above
# @return void
private method stepback_save_spec_subprog {action} {
lset stepback_spec {end 0} $action
}
## Discard stack for stepback functions
# @return void
public method stepback_discard_stack {} {
set stepback_local_regs {}
set stepback_normal {}
set stepback_spec {}
set stepback_local {}
set stepback_length 0
}
## Get stepback stack length
# @return Int - stack length
public method simulator_get_SBS_len {} {
if {${::Simulator::reverse_run_steps}} {
return $stepback_length
} else {
return 0
}
}
## Set stepback stack length
# @parm Int value - stack length
# @return void
public method simulator_set_SBS_len {value} {
set stepback_length $value
}
# >>> File inclusion guard
}
# <<< File inclusion guard
|
