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