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Code Issues Projects Releases Wiki Activity

Trace ProDOS MLI calls

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This commit is contained in:
Ivan Izaguirre 2020-06-07 18:23:39 +02:00
parent 48afaa471b
commit 636895a7e4
6 changed files with 314 additions and 8 deletions
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3
README.md
View File

@ -46,6 +46,7 @@ Portable emulator of an Apple II+ or //e. Written in Go.
- Fast disk mode to set max speed while using the disks.
- Single file executable with embedded ROMs and DOS 3.3
- Pause (thanks a2geek)
- ProDOS MLI calls tracing
## Running the emulator
@ -175,6 +176,8 @@ Only valid on SDL mode
dump to the console the CPU execution. Use F11 to toggle.
-traceHD
dump to the console the hd commands
-traceMLI
dump to the console the calls to ProDOS machine langunage interface calls to $BF00
-traceSS
dump to the console the sofswitches calls
-vidHDSlot int

23
apple2.go
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@ -28,6 +28,7 @@ type Apple2 struct {
profile bool
showSpeed bool
paused bool
traceMLI *traceProDOS
}
const (
@ -51,10 +52,9 @@ func (a *Apple2) Run() {
// Run a 6502 step
if !a.paused {
a.cpu.ExecuteInstruction()
a.executionTrace()
} else {
time.Sleep(200 * time.Millisecond)
referenceTime = time.Now()
speedReferenceTime = referenceTime
}
// Execute meta commands
@ -62,10 +62,17 @@ func (a *Apple2) Run() {
for commandsPending {
select {
case command := <-a.commandChannel:
if command == CommandKill {
switch command {
case CommandKill:
return
case CommandPauseUnpauseEmulator:
a.paused = !a.paused
referenceTime = time.Now()
speedReferenceTime = referenceTime
default:
// Execute the other commands
a.executeCommand(command)
}
a.executeCommand(command)
default:
commandsPending = false
}
@ -178,8 +185,6 @@ func (a *Apple2) executeCommand(command int) {
a.cpu.SetTrace(!a.cpu.GetTrace())
case CommandReset:
a.cpu.Reset()
case CommandPauseUnpauseEmulator:
a.paused = !a.paused
}
}
@ -196,6 +201,12 @@ func (a *Apple2) releaseFastMode() {
}
}
func (a *Apple2) executionTrace() {
if a.traceMLI != nil {
a.traceMLI.inspect()
}
}
type persistent interface {
save(io.Writer) error
load(io.Reader) error

5
apple2Setup.go
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@ -44,10 +44,13 @@ func newApple2eEnhanced() *Apple2 {
return &a
}
func (a *Apple2) setup(isColor bool, clockMhz float64, fastMode bool) {
func (a *Apple2) setup(isColor bool, clockMhz float64, fastMode bool, traceMLI bool) {
a.commandChannel = make(chan int, 100)
a.isColor = isColor
a.fastMode = fastMode
if traceMLI {
a.traceMLI = newTraceProDOS(a)
}
if clockMhz <= 0 {
// Full speed

7
apple2main.go
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@ -109,6 +109,11 @@ func MainApple() *Apple2 {
"profile",
false,
"generate profile trace to analyse with pprof")
traceMLI := flag.Bool(
"traceMLI",
false,
"dump to the console the calls to ProDOS machine langunage interface calls to $BF00")
flag.Parse()
if *wozImage != "" {
@ -178,7 +183,7 @@ func MainApple() *Apple2 {
panic("Model not supported")
}
a.setup(!*mono, *cpuClock, *fastDisk)
a.setup(!*mono, *cpuClock, *fastDisk, *traceMLI)
a.cpu.SetTrace(*traceCPU)
a.io.setTrace(*traceSS)
a.io.setPanicNotImplemented(*panicSS)

10
core6502/execute.go
View File

@ -103,6 +103,16 @@ func (s *State) GetTrace() bool {
return s.trace
}
// GetPCAndSP returns the current program counter and stack pointer. Used to trace MLI calls
func (s *State) GetPCAndSP() (uint16, uint8) {
return s.reg.getPC(), s.reg.getSP()
}
// GetCarryAndAcc returns the value of te carry flag and the accumulator. Used to trace MLI calls
func (s *State) GetCarryAndAcc() (bool, uint8) {
return s.reg.getFlag(flagC), s.reg.getA()
}
// Save saves the CPU state (registers and cycle counter)
func (s *State) Save(w io.Writer) error {
err := binary.Write(w, binary.BigEndian, s.cycles)

274
traceProDOS.go Normal file
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@ -0,0 +1,274 @@
package apple2
import "fmt"
type traceProDOS struct {
a *Apple2
callPending bool // We assume MLI is not reentrant
functionCode uint8
paramsAdddress uint16
returnAddress uint16
}
const (
mliAddress uint16 = 0xbf00
biAddress uint16 = 0xbe03
)
func newTraceProDOS(a *Apple2) *traceProDOS {
var t traceProDOS
t.a = a
return &t
}
func (t *traceProDOS) inspect() {
pc, ps := t.a.cpu.GetPCAndSP()
if pc == mliAddress {
/*
MLI has been called (provided we are running proDOS and the proper page)
Calls to MLI must be:
JSR $BF00
DFB function_code
DW addr_op_parms
*/
if t.callPending {
if t.functionCode == 0x65 {
// QUIT when successfull does not return
fmt.Printf("Ok \n")
} else {
fmt.Print("<there was a call pending>\n")
}
}
caller := uint16(t.a.mmu.Peek(0x100+uint16(ps+1))) +
uint16(t.a.mmu.Peek(0x100+uint16(ps+2)))<<8 - 2
t.functionCode = t.a.mmu.Peek(caller + 3)
t.paramsAdddress = uint16(t.a.mmu.Peek(caller+4)) + uint16(t.a.mmu.Peek(caller+5))<<8
t.returnAddress = caller + 6
fmt.Printf("MLI call $%02x from $%04x", t.functionCode, caller)
switch t.functionCode {
case 0x40:
fmt.Printf(" ALLOC_INTERRUPT()")
case 0x41:
fmt.Printf(" DEALLOC_INTERRUPT()")
case 0x65:
fmt.Printf(" QUIT()")
case 0x80:
fmt.Printf(" READ_BLOCK(unit=%s, block=$%04x)", parseUnit(t.paramByte(1)), t.paramWord(4))
case 0x81:
fmt.Printf(" WRITE_BLOCK(unit=%s, block=$%04x)", parseUnit(t.paramByte(1)), t.paramWord(4))
case 0x82:
fmt.Printf(" GET_TIME()")
case 0xc0:
fmt.Printf(" CREATE(\"%s\")", t.paramString(1))
case 0xc1:
fmt.Printf(" DESTROY(\"%s\")", t.paramString(1))
case 0xc2:
fmt.Printf(" RENAME(old=\"%s\", new=\"%s\")", t.paramString(1), t.paramString(3))
case 0xc3:
fmt.Printf(" GET_FILE_INFO(\"%s\")", t.paramString(1))
case 0xc4:
fmt.Printf(" SET_FILE_INFO(\"%s\")", t.paramString(1))
case 0xc5:
fmt.Printf(" ONLINE(unit=%s)", parseUnit(t.paramByte(1)))
case 0xc6:
fmt.Printf(" SET_PREFIX(\"%s\")", t.paramString(1))
case 0xc7:
fmt.Printf(" GET_PREFIX()")
case 0xc8:
fmt.Printf(" OPEN(\"%s\")", t.paramString(1))
case 0xc9:
fmt.Printf(" NEWLINE(ref=%v, mask=$%02x, char=$%02x)", t.paramByte(1), t.paramByte(2), t.paramByte(3))
case 0xca:
fmt.Printf(" READ(ref=%v, len=%v)", t.paramByte(1), t.paramWord(4))
case 0xcb:
fmt.Printf(" WRITE(ref=%v, len=%v)", t.paramByte(1), t.paramWord(4))
case 0xcc:
fmt.Printf(" CLOSE(ref=%v)", t.paramByte(1))
case 0xcd:
fmt.Printf(" FLUSH(ref=%v)", t.paramByte(1))
case 0xce:
fmt.Printf(" SET_MARK(ref=%v, pos=%v)", t.paramByte(1), t.paramLen(2))
case 0xcf:
fmt.Printf(" GET_MARK(ref=%v)", t.paramByte(1))
case 0xd1:
fmt.Printf(" GET_EOF(ref=%v)", t.paramByte(1))
case 0xd2:
fmt.Printf(" SET_BUF(ref=%v)", t.paramByte(1))
case 0xd3:
fmt.Printf(" GET_BUF(ref=%v)", t.paramByte(1))
}
fmt.Printf(" => ")
t.callPending = true
} else if t.callPending && pc == t.returnAddress {
error, acc := t.a.cpu.GetCarryAndAcc()
if error {
fmt.Printf("error $%02x: %v\n", acc, getMliErrorText(acc))
} else {
switch t.functionCode {
case 0x82: // Get Time
// Globals will be updated
date := uint16(t.a.mmu.Peek(0xbf90)) + uint16(t.a.mmu.Peek(0xbf91))<<8
minute := t.a.mmu.Peek(0xbf92)
hour := t.a.mmu.Peek(0xbf93)
fmt.Printf("%04v-%02v-%02v %02v:%02v\n",
date>>9+1900, (date>>5)&0x1f, date&0x1f, // Review Y2K
hour, minute)
case 0xc5: // Online
dataAddress := t.paramWord(2)
for {
b := t.a.mmu.Peek(dataAddress)
dataAddress++
if b == 0 {
fmt.Printf("\n")
break
}
unit := parseUnit(b)
size := b & 0xf
if size != 0 {
// No error
name := ""
for i := uint8(0); i < size; i++ {
name += string(t.a.mmu.Peek(dataAddress+uint16(i)) & 0x7f)
}
fmt.Printf("%s: \"%s\" ", unit, name)
} else {
err := t.a.mmu.Peek(dataAddress)
fmt.Printf("%s: error $%02x ", unit, err)
}
if t.paramByte(1) != 0 {
fmt.Printf("\n")
break // Only one entry requested
}
dataAddress += 15
}
case 0xc7: // Get prefix
fmt.Printf("\"%v\"\n", t.paramString(1))
case 0xc8: // Open file
fmt.Printf("ref: %v\n", t.paramByte(5))
case 0xca: // Read
fmt.Printf("%v bytes read \n", t.paramByte(6))
case 0xcb: // Write
fmt.Printf("%v bytes written \n", t.paramByte(6))
case 0xcf: // File position
fmt.Printf("%v\n", t.paramLen(2))
case 0xd1: // File size
fmt.Printf("%v bytes\n", t.paramLen(2))
default:
fmt.Printf("Ok\n")
}
}
t.callPending = false
} else if pc == biAddress {
s := ""
for i := uint16(1); i < 256; i++ {
ch := t.a.mmu.Peek(0x200 + i)
if ch == 0 || ch == 0x8d {
break
}
s += string(ch)
}
fmt.Printf("Prodos BI exec: \"%s\".\n", s)
}
}
func (t *traceProDOS) paramByte(pos uint16) uint8 {
return t.a.mmu.Peek(t.paramsAdddress + pos)
}
func (t *traceProDOS) paramWord(pos uint16) uint16 {
// Two bytes
return uint16(t.a.mmu.Peek(t.paramsAdddress+pos)) + uint16(t.a.mmu.Peek(t.paramsAdddress+pos+1))<<8
}
func (t *traceProDOS) paramLen(pos uint16) uint32 {
// Three bytes
return uint32(t.paramWord(pos)) + uint32(t.paramByte(pos+2))<<16
}
func (t *traceProDOS) paramString(pos uint16) string {
address := t.paramWord(pos)
size := t.a.mmu.Peek(address)
s := ""
for i := uint8(0); i < size; i++ {
s += string(t.a.mmu.Peek(address+1+uint16(i)) & 0x7f)
}
return s
}
func parseUnit(unit uint8) string {
if unit == 0 {
return "All"
}
drive := unit >> 7
slot := (unit >> 4) & 7
return fmt.Sprintf("S%v,D%v", slot, drive+1)
}
func getMliErrorText(code uint8) string {
// From https://prodos8.com/docs/techref/quick-reference-card/
switch code {
case 0x00:
return "No error"
case 0x01:
return "Bad system call number"
case 0x04:
return "Bad system call parameter count"
case 0x25:
return "Interrupt table full"
case 0x27:
return "I/O error"
case 0x28:
return "No device connected"
case 0x2B:
return "Disk write protected"
case 0x2E:
return "Disk switched"
case 0x40:
return "Invalid pathname"
case 0x42:
return "Maximum number of files open"
case 0x43:
return "Invalid reference number"
case 0x44:
return "Directory not found"
case 0x45:
return "Volume not found"
case 0x46:
return "File not found"
case 0x47:
return "Duplicate filename"
case 0x48:
return "Volume full"
case 0x49:
return "Volume directory full"
case 0x4A:
return "Incompatible file format, also a ProDOS directory"
case 0x4B:
return "Unsupported storage_type"
case 0x4C:
return "End of file encountered"
case 0x4D:
return "Position out of range"
case 0x4E:
return "File access error, also file locked"
case 0x50:
return "File is open"
case 0x51:
return "Directory structure damaged"
case 0x52:
return "Not a ProDOS volume"
case 0x53:
return "Invalid system call parameter"
case 0x55:
return "Volume Control Block table full"
case 0x56:
return "Bad buffer address"
case 0x57:
return "Duplicate volume"
case 0x5A:
return "File structure damaged"
default:
return "Unknown error"
}
}