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main.go
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main.go
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// Copyright 2023 Google LLC
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
// Binary z80run executes an AoC Z80 program.
package main
import (
"bufio"
"flag"
"fmt"
"os"
"github.com/fis/aoc/z80/z80ex"
)
var (
bound = flag.Int64("bound", -1, "only emulate up to (approximately) N t-states")
)
const usage = `usage: z80run [flags] prog.bin
Optional flags:
`
func main() {
flag.Parse()
if flag.NArg() != 1 {
fmt.Fprint(os.Stderr, usage)
flag.PrintDefaults()
os.Exit(1)
}
prog := flag.Arg(0)
bin, err := os.ReadFile(prog)
if err != nil {
fmt.Fprintln(os.Stderr, err)
os.Exit(1)
}
if len(bin) > 65536 {
fmt.Fprintf(os.Stderr, "%s: too large: %d bytes\n", prog, len(bin))
os.Exit(1)
}
bufIn, bufOut := bufio.NewReader(os.Stdin), bufio.NewWriter(os.Stdout)
cpu := z80ex.NewCPU()
cpu.WriteMem(bin, 0)
var steps uint64
if *bound <= 0 {
steps = cpu.Run(bufIn, bufOut)
} else {
steps, _ = cpu.RunBounded(bufIn, bufOut, uint64(*bound))
}
bufOut.Flush()
fmt.Printf("# T = %d\n", steps)
}