43 lines
1.0 KiB
Tcl
43 lines
1.0 KiB
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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# mrh: "memory read halfword", returns value of $reg
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proc mrh {reg} {
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set value ""
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mem2array value 16 $reg 1
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return $value(0)
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}
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add_usage_text mrh "address"
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add_help_text mrh "Returns value of halfword in memory."
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# mrb: "memory read byte", returns value of $reg
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proc mrb {reg} {
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set value ""
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mem2array value 8 $reg 1
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return $value(0)
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}
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add_usage_text mrb "address"
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add_help_text mrb "Returns value of byte 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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