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emitter.go
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emitter.go
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package asm
import (
"encoding/binary"
"fmt"
"io"
"strings"
"github.com/alttpo/snes/xbuf"
)
// Emitter implements Assembler and bytes.Buffer; a 65816 immediate assembler that emits to the buffer
type Emitter struct {
flagsTracker
generateText bool
code []byte
n int
lines []asmLine
base uint32
baseSet bool
address uint32
// label name to address map:
labels map[string]uint32
// dangling references to labels; stored as absolute addresses:
danglingS8 map[string][]uint32
danglingU16 map[string][]uint32
}
type asmLineType int
const (
lineIns1 asmLineType = iota
lineIns2
lineIns2Label
lineIns3
lineIns3Label
lineIns4
lineBase
lineDB
lineComment
lineLabel
)
type asmLine struct {
asmLineType
// instruction and parameters:
address uint32
byteCount int
ins string
label string
argsFormat string
}
func NewEmitter(target []byte, generateText bool) *Emitter {
a := &Emitter{
flagsTracker: 0,
generateText: generateText,
code: target,
n: 0,
lines: nil,
base: 0,
baseSet: false,
address: 0,
labels: make(map[string]uint32),
danglingS8: make(map[string][]uint32),
danglingU16: make(map[string][]uint32),
}
return a
}
func (a *Emitter) Clone(target []byte) *Emitter {
e := &Emitter{
flagsTracker: a.flagsTracker,
generateText: a.generateText,
code: target,
n: 0,
lines: nil,
address: a.address,
base: a.base,
baseSet: a.baseSet,
labels: make(map[string]uint32, len(a.labels)),
danglingS8: make(map[string][]uint32, len(a.danglingS8)),
danglingU16: make(map[string][]uint32, len(a.danglingU16)),
}
// copy labels and dangling references:
for k, v := range a.labels {
e.labels[k] = v
}
for k, v := range a.danglingS8 {
cv := make([]uint32, len(v), cap(v))
copy(cv, v)
e.danglingS8[k] = cv
}
for k, v := range a.danglingU16 {
cv := make([]uint32, len(v), cap(v))
copy(cv, v)
e.danglingU16[k] = cv
}
return e
}
func (a *Emitter) Append(e *Emitter) {
if a.n+e.n > len(a.code) {
panic(fmt.Errorf("not enough space"))
}
a.address = e.address
a.baseSet = e.baseSet
a.flagsTracker = e.flagsTracker
a.n += copy(a.code[a.n:], e.code[0:e.n])
a.lines = append(a.lines, e.lines...)
// copy labels and dangling references:
for k, v := range e.labels {
a.labels[k] = v
}
for k, v := range e.danglingS8 {
cv := make([]uint32, len(v), cap(v))
copy(cv, v)
a.danglingS8[k] = cv
}
for k, v := range e.danglingU16 {
cv := make([]uint32, len(v), cap(v))
copy(cv, v)
a.danglingU16[k] = cv
}
}
func (a *Emitter) WriteTextTo(w io.Writer) (err error) {
if w == nil {
return
}
for _, line := range a.lines {
offs := line.address - a.base
var oa [120]byte
xb := xbuf.B(oa[:0])
switch line.asmLineType {
case lineBase:
//_, err = fmt.Fprintf(w, "base $%06x\n", line.address)
xb.S("base $").X06(line.address)
case lineComment:
//_, err = fmt.Fprintf(w, " ; %s\n", line.ins)
xb.S(" ; ").S(line.ins)
case lineLabel:
label := line.label
//_, err = fmt.Fprintf(w, "%s:\n", label)
xb.S(label).C(':')
case lineDB:
//_, err = fmt.Fprintf(w, " ; $%06x\n %s\n", line.address, line.ins)
xb.S(" ; $").X06(line.address).C('\n')
xb.S(" ").S(line.ins)
case lineIns1:
d := a.code[offs : offs+1]
//_, err = fmt.Fprintf(w, " %-5s %-12s ; $%06x %02x\n", line.ins, "", line.address, d[0])
xb.S(" ").Sn(line.ins, 5).C(' ').Sn("", 12)
xb.S(" ; $").X06(line.address).S(" ").X02(d[0])
case lineIns2:
d := a.code[offs : offs+2]
args := fmt.Sprintf(line.argsFormat, d[1])
//_, err = fmt.Fprintf(w, " %-5s %-12s ; $%06x %02x %02x\n", line.ins, args, line.address, d[0], d[1])
xb.S(" ").Sn(line.ins, 5).C(' ').Sn(args, 12)
xb.S(" ; $").X06(line.address).S(" ").X02(d[0]).C(' ').X02(d[1])
case lineIns2Label:
d := a.code[offs : offs+2]
label := line.label
if _, ok := a.danglingS8[label]; ok {
// warn about dangling label references:
//_, err = fmt.Fprintf(w, "!! %-5s %-12s ; $%06x %02x %02x !! ERROR: undefined label '%s'\n", line.ins, label, line.address, d[0], d[1], label)
xb.S("!! ").Sn(line.ins, 5).C(' ').Sn(label, 12)
xb.S(" ; $").X06(line.address).S(" ").X02(d[0]).C(' ').X02(d[1])
xb.S(" !! ERROR: undefined label '").S(label).S("'")
} else {
//_, err = fmt.Fprintf(w, " %-5s %-12s ; $%06x %02x %02x\n", line.ins, label, line.address, d[0], d[1])
xb.S(" ").Sn(line.ins, 5).C(' ').Sn(label, 12)
xb.S(" ; $").X06(line.address).S(" ").X02(d[0]).C(' ').X02(d[1])
}
case lineIns3:
d := a.code[offs : offs+3]
args := fmt.Sprintf(line.argsFormat, d[1], d[2])
//_, err = fmt.Fprintf(w, " %-5s %-12s ; $%06x %02x %02x %02x\n", line.ins, args, line.address, d[0], d[1], d[2])
xb.S(" ").Sn(line.ins, 5).C(' ').Sn(args, 12)
xb.S(" ; $").X06(line.address).S(" ").X02(d[0]).C(' ').X02(d[1]).C(' ').X02(d[2])
case lineIns3Label:
d := a.code[offs : offs+3]
label := line.label
args := fmt.Sprintf(line.argsFormat, label)
if _, ok := a.danglingU16[label]; ok {
//_, err = fmt.Fprintf(w, "!! %-5s %-12s ; $%06x %02x %02x %02x !! ERROR: undefined label '%s'\n", line.ins, args, line.address, d[0], d[1], d[2], label)
xb.S("!! ").Sn(line.ins, 5).C(' ').Sn(args, 12)
xb.S(" ; $").X06(line.address).S(" ").X02(d[0]).C(' ').X02(d[1]).C(' ').X02(d[2])
xb.S(" !! ERROR: undefined label '").S(label).S("'")
} else {
//_, err = fmt.Fprintf(w, " %-5s %-12s ; $%06x %02x %02x %02x\n", line.ins, args, line.address, d[0], d[1], d[2])
xb.S(" ").Sn(line.ins, 5).C(' ').Sn(args, 12)
xb.S(" ; $").X06(line.address).S(" ").X02(d[0]).C(' ').X02(d[1]).C(' ').X02(d[2])
}
case lineIns4:
d := a.code[offs : offs+4]
args := fmt.Sprintf(line.argsFormat, d[1], d[2], d[3])
//_, err = fmt.Fprintf(w, " %-5s %-12s ; $%06x %02x %02x %02x %02x\n", line.ins, args, line.address, d[0], d[1], d[2], d[3])
xb.S(" ").Sn(line.ins, 5).C(' ').Sn(args, 12)
xb.S(" ; $").X06(line.address).S(" ").X02(d[0]).C(' ').X02(d[1]).C(' ').X02(d[2]).C(' ').X02(d[3])
}
xb.C('\n')
_, err = w.Write(xb)
if err != nil {
return
}
}
return
}
func (a *Emitter) WriteHexTo(w io.Writer) (err error) {
if w == nil {
return
}
for _, line := range a.lines {
offs := line.address - a.base
var oa [120]byte
xb := xbuf.B(oa[:0])
switch line.asmLineType {
case lineBase:
//_, err = fmt.Fprintf(w, "base $%06x\n", line.address)
xb.S("// base $").X06(line.address)
case lineComment:
//_, err = fmt.Fprintf(w, " ; %s\n", line.ins)
xb.S("// ").S(line.ins)
case lineLabel:
label := line.label
//_, err = fmt.Fprintf(w, "%s:\n", label)
xb.S("// ").S(label).C(':')
case lineDB:
//_, err = fmt.Fprintf(w, " ; $%06x\n %s\n", line.address, line.ins)
d := a.code[offs : offs+uint32(line.byteCount)]
for i, b := range d {
if i > 0 {
xb.C(' ')
}
xb.S("0x").X02(b)
xb.C(',')
}
case lineIns1:
d := a.code[offs : offs+1]
xb.S("0x").X02(d[0]).C(',')
xb.Sn("", (4-line.byteCount)*6).S(" // ").S(line.ins)
case lineIns2:
d := a.code[offs : offs+2]
args := fmt.Sprintf(line.argsFormat, d[1])
xb.S("0x").X02(d[0]).C(',')
xb.C(' ').S("0x").X02(d[1]).C(',')
xb.Sn("", (4-line.byteCount)*6).S(" // ").Sn(line.ins, 5).C(' ').S(args)
case lineIns2Label:
d := a.code[offs : offs+2]
label := line.label
xb.S("0x").X02(d[0]).C(',')
xb.C(' ').S("0x").X02(d[1]).C(',')
xb.Sn("", (4-line.byteCount)*6).S(" // ").Sn(line.ins, 5).C(' ').S(label)
case lineIns3:
d := a.code[offs : offs+3]
args := fmt.Sprintf(line.argsFormat, d[1], d[2])
xb.S("0x").X02(d[0]).C(',')
xb.C(' ').S("0x").X02(d[1]).C(',')
xb.C(' ').S("0x").X02(d[2]).C(',')
xb.Sn("", (4-line.byteCount)*6).S(" // ").Sn(line.ins, 5).C(' ').S(args)
case lineIns3Label:
d := a.code[offs : offs+3]
label := line.label
args := fmt.Sprintf(line.argsFormat, label)
xb.S("0x").X02(d[0]).C(',')
xb.C(' ').S("0x").X02(d[1]).C(',')
xb.C(' ').S("0x").X02(d[2]).C(',')
xb.Sn("", (4-line.byteCount)*6).S(" // ").Sn(line.ins, 5).C(' ').S(args)
case lineIns4:
d := a.code[offs : offs+4]
args := fmt.Sprintf(line.argsFormat, d[1], d[2], d[3])
xb.S("0x").X02(d[0]).C(',')
xb.C(' ').S("0x").X02(d[1]).C(',')
xb.C(' ').S("0x").X02(d[2]).C(',')
xb.C(' ').S("0x").X02(d[3]).C(',')
xb.Sn("", (4-line.byteCount)*6).S(" // ").Sn(line.ins, 5).C(' ').S(args)
}
xb.C('\n')
_, err = w.Write(xb)
if err != nil {
return
}
}
return
}
func (a *Emitter) Finalize() (err error) {
// resolves all dangling label references in prior code
for label, refs := range a.danglingS8 {
addr, ok := a.labels[label]
if !ok {
return fmt.Errorf("could not resolve label '%s'", label)
}
// fill in signed 8-bit (-128..+127) references to this label:
for _, s8addr := range refs {
// adding 1 here to accommodate the size of the S8 instruction parameter
diff := int(addr) - int(s8addr+1)
if diff > 127 || diff < -128 {
return fmt.Errorf("branch from %#06x to %#06x too far for signed 8-bit; diff=%d", s8addr+1, addr, diff)
}
a.code[s8addr-a.base] = uint8(int8(diff))
}
delete(a.danglingS8, label)
}
for label, refs := range a.danglingU16 {
addr, ok := a.labels[label]
if !ok {
return fmt.Errorf("could not resolve label '%s'", label)
}
// fill in absolute unsigned 16-bit references to this label:
for _, u16addr := range refs {
binary.LittleEndian.PutUint16(
a.code[u16addr-a.base:u16addr-a.base+2],
uint16(addr&0xFFFF))
}
delete(a.danglingU16, label)
}
return
}
func (a *Emitter) Label(name string) uint32 {
if oldAddr, ok := a.labels[name]; ok {
panic(fmt.Errorf("label '%s' already defined at %#06x", name, oldAddr))
}
// define new label:
a.labels[name] = a.address
if a.generateText {
a.lines = append(a.lines, asmLine{
asmLineType: lineLabel,
address: a.address,
byteCount: 0,
ins: "",
label: name,
argsFormat: "",
})
//_, _ = fmt.Fprintf(a.Text, "%s:\n", name)
}
return a.address
}
func (a *Emitter) GetLabel(name string) (value uint32, ok bool) {
value, ok = a.labels[name]
return
}
func (a *Emitter) addDanglingS8(label string) {
refs := a.danglingS8[label]
refs = append(refs, a.address-1)
a.danglingS8[label] = refs
}
func (a *Emitter) addDanglingU16(label string) {
refs := a.danglingU16[label]
refs = append(refs, a.address-2)
a.danglingU16[label] = refs
}
func (a *Emitter) Cap() int {
return len(a.code)
}
func (a *Emitter) Len() int {
//return a.code.Len()
//return int(a.address) - int(a.base)
return a.n
}
func (a *Emitter) Bytes() []byte {
return a.code[0:a.Len()]
}
func (a *Emitter) PC() uint32 {
return a.address
}
func (a *Emitter) write(d []byte) (int, error) {
if a.code == nil {
return 0, nil
}
if a.n+len(d) > len(a.code) {
panic(fmt.Errorf("not enough space"))
}
n := copy(a.code[a.n:], d)
a.n += n
return n, nil
}
func (a *Emitter) SetBase(addr uint32) {
a.base = addr
a.address = addr
a.baseSet = true
}
func (a *Emitter) GetBase() uint32 {
return a.base
}
func (a *Emitter) emitBase() {
if !a.generateText {
return
}
if !a.baseSet {
return
}
a.lines = append(a.lines, asmLine{
asmLineType: lineBase,
address: a.address,
ins: "",
argsFormat: "",
})
//_, _ = a.Text.WriteString(fmt.Sprintf("base $%06x\n", a.address))
a.baseSet = false
}
func (a *Emitter) emit1(ins string, d [1]byte) {
_, _ = a.write(d[:])
if a.generateText {
a.emitBase()
a.lines = append(a.lines, asmLine{
asmLineType: lineIns1,
address: a.address,
byteCount: 1,
ins: ins,
argsFormat: "",
})
}
a.address += 1
}
func (a *Emitter) emit2(ins, argsFormat string, d [2]byte) {
_, _ = a.write(d[:])
if a.generateText {
a.emitBase()
a.lines = append(a.lines, asmLine{
asmLineType: lineIns2,
address: a.address,
byteCount: 2,
ins: ins,
argsFormat: argsFormat,
})
}
a.address += 2
}
func (a *Emitter) emit2Label(ins string, label string, d [2]byte) {
_, _ = a.write(d[:])
if a.generateText {
a.emitBase()
a.lines = append(a.lines, asmLine{
asmLineType: lineIns2Label,
address: a.address,
byteCount: 2,
ins: ins,
label: label,
})
}
a.address += 2
a.addDanglingS8(label)
}
func (a *Emitter) emit3(ins, argsFormat string, d [3]byte) {
_, _ = a.write(d[:])
if a.generateText {
a.emitBase()
a.lines = append(a.lines, asmLine{
asmLineType: lineIns3,
address: a.address,
byteCount: 3,
ins: ins,
argsFormat: argsFormat,
})
}
a.address += 3
}
func (a *Emitter) emit3Label(ins, label string, argsFormat string, d [3]byte) {
_, _ = a.write(d[:])
if a.generateText {
a.emitBase()
a.lines = append(a.lines, asmLine{
asmLineType: lineIns3Label,
address: a.address,
byteCount: 3,
ins: ins,
label: label,
argsFormat: argsFormat,
})
}
a.address += 3
a.addDanglingU16(label)
}
func (a *Emitter) emit4(ins, argsFormat string, d [4]byte) {
_, _ = a.write(d[:])
if a.generateText {
a.emitBase()
a.lines = append(a.lines, asmLine{
asmLineType: lineIns4,
address: a.address,
byteCount: 4,
ins: ins,
argsFormat: argsFormat,
})
}
a.address += 4
}
func imm24(v uint32) (byte, byte, byte) {
return byte(v), byte(v >> 8), byte(v >> 16)
}
func imm16(v uint16) (byte, byte) {
return byte(v), byte(v >> 8)
}
func (a *Emitter) Comment(s string) {
if a.generateText {
a.emitBase()
a.lines = append(a.lines, asmLine{
asmLineType: lineComment,
address: a.address,
byteCount: 0,
ins: s,
argsFormat: "",
})
}
}
const hextable = "0123456789abcdef"
func (a *Emitter) EmitBytes(b []byte) {
if a.generateText {
a.emitBase()
s := strings.Builder{}
s.WriteString("db ")
blen := len(b)
cl := asmLine{
asmLineType: lineDB,
address: a.address,
byteCount: blen,
ins: "",
argsFormat: "",
}
for i, v := range b {
s.Write([]byte{'$', hextable[(v>>4)&0xF], hextable[v&0xF]})
if i&15 == 15 {
cl.ins = s.String()
a.lines = append(a.lines, cl)
s.Reset()
s.WriteString("db ")
cl.ins = ""
cl.address = a.address + uint32(i) + 1
} else if i < blen-1 {
s.Write([]byte{',', ' '})
continue
}
}
if s.Len() > len("db ") {
cl.ins = s.String()
a.lines = append(a.lines, cl)
}
}
_, _ = a.write(b)
a.address += uint32(len(b))
}
func (a *Emitter) REP(c Flags) {
a.AssumeREP(c)
a.emit2("rep", "#$%02x", [2]byte{0xC2, byte(c)})
}
func (a *Emitter) SEP(c Flags) {
a.AssumeSEP(c)
a.emit2("sep", "#$%02x", [2]byte{0xE2, byte(c)})
}
func (a *Emitter) NOP() {
a.emit1("nop", [1]byte{0xEA})
}
func (a *Emitter) JSR_abs(addr uint16) {
var d [3]byte
d[0] = 0x20
d[1], d[2] = imm16(addr)
a.emit3("jsr", "$%02[2]x%02[1]x", d)
}
func (a *Emitter) JSL(addr uint32) {
var d [4]byte
d[0] = 0x22
d[1], d[2], d[3] = imm24(addr)
a.emit4("jsl", "$%02[3]x%02[2]x%02[1]x", d)
}
func (a *Emitter) JSL_lhb(lo, hi, bank uint8) {
var d [4]byte
d[0] = 0x22
d[1], d[2], d[3] = lo, hi, bank
a.emit4("jsl", "$%02[3]x%02[2]x%02[1]x", d)
}
func (a *Emitter) JML(addr uint32) {
var d [4]byte
d[0] = 0x5C
d[1], d[2], d[3] = imm24(addr)
a.emit4("jml", "$%02[3]x%02[2]x%02[1]x", d)
}
func (a *Emitter) RTS() {
a.emit1("rts", [1]byte{0x60})
}
func (a *Emitter) RTL() {
a.emit1("rtl", [1]byte{0x6B})
}
func (a *Emitter) RTI() {
a.emit1("rti", [1]byte{0x40})
}
func (a *Emitter) LDA_imm8_b(m uint8) {
if a.IsM16bit() {
panic(fmt.Errorf("asm: LDA_imm8_b called but 'm' flag is 16-bit; call SEP(0x20) or AssumeSEP(0x20) first"))
}
var d [2]byte
d[0] = 0xA9
d[1] = m
a.emit2("lda.b", "#$%02x", d)
}
func (a *Emitter) LDA_imm16_w(m uint16) {
if !a.IsM16bit() {
panic(fmt.Errorf("asm: LDA_imm16_w called but 'm' flag is 8-bit; call REP(0x20) or AssumeREP(0x20) first"))
}
var d [3]byte
d[0] = 0xA9
d[1], d[2] = imm16(m)
a.emit3("lda.w", "#$%02[2]x%02[1]x", d)
}
func (a *Emitter) LDA_imm16_lh(lo, hi uint8) {
if !a.IsM16bit() {
panic(fmt.Errorf("asm: LDA_imm16_lh called but 'm' flag is 8-bit; call REP(0x20) or AssumeREP(0x20) first"))
}
var d [3]byte
d[0] = 0xA9
d[1], d[2] = lo, hi
a.emit3("lda.w", "#$%02[2]x%02[1]x", d)
}
func (a *Emitter) LDA_long(addr uint32) {
var d [4]byte
d[0] = 0xAF
d[1], d[2], d[3] = imm24(addr)
a.emit4("lda.l", "$%02[3]x%02[2]x%02[1]x", d)
}
func (a *Emitter) LDA_abs(addr uint16) {
var d [3]byte
d[0] = 0xAD
d[1], d[2] = imm16(addr)
a.emit3("lda.w", "$%02[2]x%02[1]x", d)
}
func (a *Emitter) LDA_abs_x(addr uint16) {
var d [3]byte
d[0] = 0xBD
d[1], d[2] = imm16(addr)
a.emit3("lda.w", "$%02[2]x%02[1]x,X", d)
}
func (a *Emitter) LDA_long_x(addr uint32) {
var d [4]byte
d[0] = 0xBF
d[1], d[2], d[3] = imm24(addr)
a.emit4("lda.l", "$%02[3]x%02[2]x%02[1]x,X", d)
}
func (a *Emitter) STA_long(addr uint32) {
var d [4]byte
d[0] = 0x8F
d[1], d[2], d[3] = imm24(addr)
a.emit4("sta.l", "$%02[3]x%02[2]x%02[1]x", d)
}
func (a *Emitter) STA_abs(addr uint16) {
var d [3]byte
d[0] = 0x8D
d[1], d[2] = imm16(addr)
a.emit3("sta.w", "$%02[2]x%02[1]x", d)
}
func (a *Emitter) STA_abs_x(addr uint16) {
var d [3]byte
d[0] = 0x9D
d[1], d[2] = imm16(addr)
a.emit3("sta.w", "$%02[2]x%02[1]x,X", d)
}
func (a *Emitter) STA_dp(addr uint8) {
var d [2]byte
d[0] = 0x85
d[1] = addr
a.emit2("sta.b", "$%02[1]x", d)
}
func (a *Emitter) STY_abs(offs uint16) {
var d [3]byte
d[0] = 0x8C
d[1], d[2] = imm16(offs)
a.emit3("sty.w", "$%02[2]x%02[1]x", d)
}
func (a *Emitter) STY_dp(addr uint8) {
var d [2]byte
d[0] = 0x84
d[1] = addr
a.emit2("sty.b", "$%02[1]x", d)
}
func (a *Emitter) STY_dp_x(addr uint8) {
var d [2]byte
d[0] = 0x94
d[1] = addr
a.emit2("sty.b", "$%02[1]x,X", d)
}
func (a *Emitter) ORA_long(addr uint32) {
var d [4]byte
d[0] = 0x0F
d[1], d[2], d[3] = imm24(addr)
a.emit4("ora.l", "$%02[3]x%02[2]x%02[1]x", d)
}
func (a *Emitter) ORA_imm8_b(m uint8) {
if a.IsM16bit() {
panic(fmt.Errorf("asm: ORA_imm8_b called but 'm' flag is 16-bit; call SEP(0x20) or AssumeSEP(0x20) first"))
}
var d [2]byte
d[0] = 0x09
d[1] = m
a.emit2("ora.b", "#$%02x", d)
}
func (a *Emitter) ORA_imm16_w(m uint16) {
if !a.IsM16bit() {
panic(fmt.Errorf("asm: ORA_imm16_w called but 'm' flag is 8-bit; call REP(0x20) or AssumeREP(0x20) first"))
}
var d [3]byte
d[0] = 0x09
d[1], d[2] = imm16(m)
a.emit3("ora.w", "#$%02[2]x%02[1]x", d)
}
func (a *Emitter) CMP_imm8_b(m uint8) {
if a.IsM16bit() {
panic(fmt.Errorf("asm: CMP_imm8_b called but 'm' flag is 16-bit; call SEP(0x20) or AssumeSEP(0x20) first"))
}
var d [2]byte
d[0] = 0xC9
d[1] = m
a.emit2("cmp.b", "#$%02x", d)
}
func (a *Emitter) CMP_imm16_w(m uint16) {
if !a.IsM16bit() {
panic(fmt.Errorf("asm: CMP_imm16_w called but 'm' flag is 8-bit; call REP(0x20) or AssumeREP(0x20) first"))
}
var d [3]byte
d[0] = 0xC9
d[1], d[2] = imm16(m)
a.emit3("cmp.w", "#$%02[2]x%02[1]x", d)
}
func (a *Emitter) CMP_long(addr uint32) {
var d [4]byte
d[0] = 0xCF
d[1], d[2], d[3] = imm24(addr)
a.emit4("cmp.l", "$%02[3]x%02[2]x%02[1]x", d)
}
func (a *Emitter) BNE_imm8(m int8) {
var d [2]byte
d[0] = 0xD0
d[1] = uint8(m)
a.emit2("bne", "$%02x", d)
}
func (a *Emitter) BNE(label string) {
var d [2]byte
d[0] = 0xD0
d[1] = 0xFF // will be overwritten by Finalize()
a.emit2Label("bne", label, d)
}
func (a *Emitter) BEQ_imm8(m int8) {
var d [2]byte
d[0] = 0xF0
d[1] = uint8(m)
a.emit2("beq", "$%02x", d)
}
func (a *Emitter) BEQ(label string) {
var d [2]byte
d[0] = 0xF0
d[1] = 0xFF // will be overwritten by Finalize()
a.emit2Label("beq", label, d)
}
func (a *Emitter) BPL_imm8(m int8) {
var d [2]byte
d[0] = 0x10
d[1] = uint8(m)
a.emit2("bpl", "$%02x", d)
}
func (a *Emitter) BPL(label string) {
var d [2]byte
d[0] = 0x10
d[1] = 0xFF // will be overwritten by Finalize()
a.emit2Label("bpl", label, d)
}
func (a *Emitter) BMI(label string) {
var d [2]byte
d[0] = 0x30
d[1] = 0xFF // will be overwritten by Finalize()
a.emit2Label("bmi", label, d)
}
func (a *Emitter) BCC(label string) {
var d [2]byte
d[0] = 0x90
d[1] = 0xFF // will be overwritten by Finalize()
a.emit2Label("bcc", label, d)
}
func (a *Emitter) BCS(label string) {
var d [2]byte
d[0] = 0xB0
d[1] = 0xFF // will be overwritten by Finalize()
a.emit2Label("bcs", label, d)
}
func (a *Emitter) BRA_imm8(m int8) {
var d [2]byte
d[0] = 0x80
d[1] = uint8(m)
a.emit2("bra", "$%02x", d)
}
func (a *Emitter) BRA(label string) {
var d [2]byte
d[0] = 0x80
d[1] = 0xFF // will be overwritten by Finalize()
a.emit2Label("bra", label, d)
}
func (a *Emitter) JMP_abs(label string) {
var d [3]byte
d[0] = 0x4C
d[1] = 0xFF // will be overwritten by Finalize()
d[2] = 0xFF // will be overwritten by Finalize()
a.emit3Label("jmp.w", label, "%s", d)
}
func (a *Emitter) JMP_abs_imm16_w(m uint16) {
var d [3]byte
d[0] = 0x4C
d[1], d[2] = imm16(m)
a.emit3("jmp.w", "$%02[2]x%02[1]x", d)
}
func (a *Emitter) ADC_imm8_b(m uint8) {
if a.IsM16bit() {
panic(fmt.Errorf("asm: ADC_imm8_b called but 'm' flag is 16-bit; call SEP(0x20) or AssumeSEP(0x20) first"))
}
var d [2]byte
d[0] = 0x69
d[1] = m
a.emit2("adc.b", "#$%02x", d)
}
func (a *Emitter) CPY_imm8_b(m uint8) {
if a.IsX16bit() {
panic(fmt.Errorf("asm: CPY_imm8_b called but 'x' flag is 16-bit; call SEP(0x10) or AssumeSEP(0x10) first"))
}
var d [2]byte
d[0] = 0xC0
d[1] = m
a.emit2("cpy.b", "#$%02x", d)
}
func (a *Emitter) LDY_abs(offs uint16) {
var d [3]byte
d[0] = 0xAC
d[1], d[2] = imm16(offs)
a.emit3("ldy.w", "$%02[2]x%02[1]x", d)
}
func (a *Emitter) STZ_dp(offs uint8) {
var d [2]byte
d[0] = 0x64
d[1] = offs
a.emit2("stz.b", "$%02[1]x", d)
}
func (a *Emitter) STZ_abs(offs uint16) {
var d [3]byte
d[0] = 0x9C
d[1], d[2] = imm16(offs)
a.emit3("stz.w", "$%02[2]x%02[1]x", d)
}
func (a *Emitter) STZ_abs_x(addr uint16) {
var d [3]byte
d[0] = 0x9E
d[1], d[2] = imm16(addr)
a.emit3("stz.w", "$%02[2]x%02[1]x,X", d)
}
func (a *Emitter) INC_dp(addr uint8) {
var d [2]byte
d[0] = 0xE6
d[1] = addr
a.emit2("inc.b", "$%02[1]x", d)
}
func (a *Emitter) INC_abs(offs uint16) {
var d [3]byte
d[0] = 0xEE
d[1], d[2] = imm16(offs)
a.emit3("inc.w", "$%02[2]x%02[1]x", d)
}
func (a *Emitter) DEC_dp(addr uint8) {
var d [2]byte
d[0] = 0xC6
d[1] = addr
a.emit2("dec.b", "$%02[1]x", d)
}
func (a *Emitter) DEC_abs(offs uint16) {
var d [3]byte
d[0] = 0xCE
d[1], d[2] = imm16(offs)
a.emit3("dec.w", "$%02[2]x%02[1]x", d)
}
func (a *Emitter) LDA_dp(addr uint8) {
var d [2]byte
d[0] = 0xA5
d[1] = addr
a.emit2("lda.b", "$%02[1]x", d)
}
func (a *Emitter) LDX_imm8_b(m uint8) {
if a.IsX16bit() {
panic(fmt.Errorf("asm: LDX_imm8_b called but 'x' flag is 16-bit; call SEP(0x10) or AssumeSEP(0x10) first"))
}
var d [2]byte
d[0] = 0xA2
d[1] = m
a.emit2("ldx.b", "#$%02x", d)
}
func (a *Emitter) LDX_abs(offs uint16) {
var d [3]byte
d[0] = 0xAE
d[1], d[2] = imm16(offs)