mirror of
https://github.com/freewilll/apple2-go.git
synced 2024-11-17 18:07:38 +00:00
97 lines
2.3 KiB
Go
97 lines
2.3 KiB
Go
package cpu
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import (
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"fmt"
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"strings"
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)
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func printFlag(p byte, flag uint8, code string) {
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if (p & flag) == 0 {
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fmt.Print(code)
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} else {
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fmt.Printf("%s", strings.ToUpper(code))
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}
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}
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func printInstruction(s *State, instruction string) {
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fmt.Printf("%04x %-24s A=%02x X=%02x Y=%02x S=%02x P=%02x ",
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s.PC,
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instruction,
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s.A,
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s.X,
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s.Y,
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s.SP,
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s.P,
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)
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printFlag(s.P, CpuFlagN, "n")
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printFlag(s.P, CpuFlagV, "v")
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fmt.Print("-") // CpuFlagR flag that's always 1
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printFlag(s.P, CpuFlagB, "b")
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printFlag(s.P, CpuFlagD, "d")
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printFlag(s.P, CpuFlagI, "i")
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printFlag(s.P, CpuFlagZ, "z")
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printFlag(s.P, CpuFlagC, "c")
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fmt.Println("")
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}
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func PrintInstruction(s *State) {
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opcodeValue := s.PageTable[(s.PC)>>8][(s.PC)&0xff]
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opcode := OpCodes[opcodeValue]
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mnemonic := opcode.Mnemonic
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size := opcode.AddressingMode.OperandSize
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stringFormat := opcode.AddressingMode.StringFormat
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var value uint16
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if size == 0 {
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printInstruction(s, fmt.Sprintf("%02x %s", opcodeValue, mnemonic))
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return
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}
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var opcodes string
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var suffix string
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if opcode.AddressingMode.Mode == AmRelative {
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value = uint16(s.PageTable[(s.PC+1)>>8][(s.PC+1)&0xff])
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var relativeAddress uint16
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if (value & 0x80) == 0 {
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relativeAddress = s.PC + 2 + uint16(value)
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} else {
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relativeAddress = s.PC + 2 + uint16(value) - 0x100
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}
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suffix = fmt.Sprintf(stringFormat, relativeAddress)
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opcodes = fmt.Sprintf("%02x %02x ", opcodeValue, value)
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} else if size == 1 {
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value = uint16(s.PageTable[(s.PC+1)>>8][(s.PC+1)&0xff])
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suffix = fmt.Sprintf(stringFormat, value)
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opcodes = fmt.Sprintf("%02x %02x ", opcodeValue, value)
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} else if size == 2 {
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lsb := s.PageTable[(s.PC+1)>>8][(s.PC+1)&0xff]
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msb := s.PageTable[(s.PC+2)>>8][(s.PC+2)&0xff]
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value = uint16(lsb) + uint16(msb)*0x100
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suffix = fmt.Sprintf(stringFormat, value)
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opcodes = fmt.Sprintf("%02x %02x %02x ", opcodeValue, lsb, msb)
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}
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printInstruction(s, fmt.Sprintf("%s %s %s", opcodes, mnemonic, suffix))
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}
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func DumpMemory(s *State, offset uint16) {
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var i uint16
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for i = 0; i < 0x100; i++ {
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if (i & 0xf) == 8 {
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fmt.Print(" ")
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}
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if (i & 0xf) == 0 {
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if i > 0 {
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fmt.Print("\n")
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}
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fmt.Printf("%04x ", offset+i)
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}
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fmt.Printf(" %02x", s.PageTable[(offset+i)>>8][(offset+i)&0xff])
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}
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fmt.Print("\n")
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}
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