# Helper for common memory read/modify/write procedures # mrw: "memory read word", returns value of $reg proc mrw {reg} { set value "" mem2array value 32 $reg 1 return $value(0) } add_usage_text mrw "address" add_help_text mrw "Returns value of word in memory." proc mrb {reg} { set value "" mem2array value 8 $reg 1 return $value(0) } add_usage_text mrb "address" add_help_text mrb "Returns value of byte in memory." # mmw: "memory modify word", updates value of $reg # $reg <== ((value & ~$clearbits) | $setbits) proc mmw {reg setbits clearbits} { set old [mrw $reg] set new [expr ($old & ~$clearbits) | $setbits] mww $reg $new } add_usage_text mmw "address setbits clearbits" add_help_text mmw "Modify word in memory. new_val = (old_val & ~clearbits) | setbits;"