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64 lines
1.5 KiB
Go
64 lines
1.5 KiB
Go
package main
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import (
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"fmt"
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"io/ioutil"
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"os"
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"github.com/gonuts/commander"
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"github.com/zellyn/go6502/asm"
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)
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var cmdDisasm = &commander.Command{
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Run: runDisasm,
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UsageLine: "disasm [-a address] filename",
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Short: "disassemble binary files",
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Long: `
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Disasm is a very simple disassembler for 6502 binary files.
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`,
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}
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var disasmAddress uint // disasm -a flag
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var symbolFile string // disasm -s flag
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var printLabels bool // disasm -p flag
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func init() {
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cmdDisasm.Flag.UintVar(&disasmAddress, "a", 0, "The starting memory address.")
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cmdDisasm.Flag.StringVar(&symbolFile, "s", "", "File of symbol definitions.")
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cmdDisasm.Flag.BoolVar(&printLabels, "p", false, "Print labels for symbols.")
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}
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func runDisasm(cmd *commander.Command, args []string) error {
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if len(args) != 1 {
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cmd.Usage()
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return nil
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}
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bytes, err := ioutil.ReadFile(args[0])
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if err != nil {
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return err
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}
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if len(bytes) > 0x10000 {
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return fmt.Errorf("File %s is %04X bytes long, which is more than $10000.", args[0], len(bytes))
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}
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if int(disasmAddress)+len(bytes) > 0x10000 {
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return fmt.Errorf("Starting address ($%04X) + file length ($%04X) = $%X, which is > $10000",
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disasmAddress, len(bytes), int(disasmAddress)+len(bytes))
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}
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var s asm.Symbols
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if symbolFile != "" {
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s, err = asm.ReadSymbols(symbolFile)
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if err != nil {
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return err
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}
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} else {
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if printLabels {
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return fmt.Errorf("-p (print labels) specified without -s (symbol table file")
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}
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}
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asm.DisasmBlock(bytes, uint16(disasmAddress), os.Stdout, s, 2, printLabels)
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return nil
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}
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