diff options
Diffstat (limited to 'lib/simulator/engine/engine_auxiliary_alo_functions.tcl')
| -rw-r--r-- | lib/simulator/engine/engine_auxiliary_alo_functions.tcl | 22 |
1 files changed, 12 insertions, 10 deletions
diff --git a/lib/simulator/engine/engine_auxiliary_alo_functions.tcl b/lib/simulator/engine/engine_auxiliary_alo_functions.tcl index 8929268..44392c3 100644 --- a/lib/simulator/engine/engine_auxiliary_alo_functions.tcl +++ b/lib/simulator/engine/engine_auxiliary_alo_functions.tcl @@ -1,10 +1,13 @@ #!/usr/bin/tclsh -# Part of MCU 8051 IDE ( http://mcu8051ide.sf.net ) +# Part of MCU 8051 IDE ( http://http://www.moravia-microsystems.com/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@moravia-microsystems.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 # @@ -53,9 +56,10 @@ private method undefined_octet {} { } ## Add value to accumulator and affect PSW flags - # @parm Int val - value to add + # @parm Int val - value to add + # @parm Int carry - addtional value to add (ment for the Carry flag) # @return void -private method alo_add {val} { +private method alo_add {val {carry 0}} { # Adjust stepback stack if {${::Simulator::reverse_run_steps}} { @@ -69,7 +73,7 @@ private method alo_add {val} { set val_l [expr {$val & 15}] ;# Low-order nibble of val # Compute low-order nibble of result - set result [expr {$val_l + $A_l}] + set result [expr {$val_l + $A_l + $carry}] # Flag AC if {$result > 15} { @@ -109,10 +113,7 @@ private method alo_add {val} { # @parm Int val - value to add # @return void private method alo_addc {val} { - if {[getBit $symbol(C)]} { - incr val - } - alo_add $val + alo_add $val [getBit $symbol(C)] } ## Subtract tegister from ACC with borrow and affect PSW flags @@ -126,8 +127,9 @@ private method alo_subb {val} { } # Flag PSW.C + set carry 0 if {[getBit $symbol(C)]} { - incr val + set carry 1 } # Local variables @@ -137,7 +139,7 @@ private method alo_subb {val} { set val_l [expr {$val & 15}] ;# Low-order nibble of val # Compute low-order nibble of result - set result_l [expr {$A_l - $val_l}] + set result_l [expr {$A_l - $val_l - $carry}] # Flag AC if {$result_l < 0} { |