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-rw-r--r--asmmon.c159
-rw-r--r--opcode.h12
-rw-r--r--sux.c36
-rw-r--r--test/reg-transfer.s23
4 files changed, 151 insertions, 79 deletions
diff --git a/asmmon.c b/asmmon.c
index 587b1f6..73697d1 100644
--- a/asmmon.c
+++ b/asmmon.c
@@ -3,6 +3,7 @@
#define debug 1
+#define OPNUM 85
#define SETOP(num, _mne, _IMM, _ZM, _ZMX, _ZMY, _ABS, _IMPL) \
{opcodes[num].mnemonic[3] = '\0'; strncpy(opcodes[num].mnemonic, _mne, 3); \
opcodes[num].imm = _IMM; \
@@ -10,87 +11,93 @@ opcodes[num].zm = _ZM; opcodes[num].zmx = _ZMX; opcodes[num].zmy = _ZMY; \
opcodes[num].abs = _ABS; opcodes[num].impl = _IMPL;}
int asmmon() {
- opent opcodes[79];
+ opent opcodes[OPNUM];
/* mne IMM ZM ZMX ZMY ABS IMPL*/
SETOP(0, "CPS", 0x00, 0x00, 0x00, 0x00, 0x00, 0x00);
SETOP(1, "ADC", 0x01, 0x05, 0x00, 0x00, 0x03, 0x00);
SETOP(2, "PHP", 0x08, 0x00, 0x00, 0x00, 0x00, 0x00);
SETOP(3, "PHA", 0x09, 0x00, 0x00, 0x00, 0x00, 0x00);
SETOP(4, "PHY", 0x0A, 0x00, 0x00, 0x00, 0x00, 0x00);
- SETOP(5, "PHX", 0x0C, 0x00, 0x00, 0x00, 0x00, 0x00);
- SETOP(6, "JMP", 0x00, 0xD0, 0x00, 0x00, 0x10, 0x00);
- SETOP(7, "SBC", 0x11, 0x15, 0x00, 0x00, 0x13, 0x00);
- SETOP(8, "PLP", 0x18, 0x00, 0x00, 0x00, 0x00, 0x00);
- SETOP(9, "PLA", 0x19, 0x00, 0x00, 0x00, 0x00, 0x00);
- SETOP(10, "PLY", 0x1A, 0x00, 0x00, 0x00, 0x00, 0x00);
- SETOP(11, "PLX", 0x1C, 0x00, 0x00, 0x00, 0x00, 0x00);
- SETOP(12, "JSR", 0x00, 0x20, 0x00, 0x00, 0x00, 0x00);
- SETOP(13, "AND", 0x21, 0x2B, 0x00, 0x00, 0x29, 0x00);
- SETOP(14, "ANY", 0x22, 0x82, 0x00, 0x00, 0x52, 0x00);
- SETOP(15, "AAY", 0x00, 0x00, 0x00, 0x00, 0x00, 0x23);
- SETOP(16, "ANX", 0x24, 0x84, 0x00, 0x00, 0x54, 0x00);
- SETOP(17, "AAX", 0x00, 0x00, 0x00, 0x00, 0x00, 0x25);
- SETOP(18, "STT", 0x28, 0x00, 0x00, 0x00, 0x00, 0x00);
- SETOP(19, "BPO", 0x00, 0x00, 0x00, 0x00, 0x30, 0x00);
- SETOP(20, "ORA", 0x31, 0x3B, 0x00, 0x00, 0x39, 0x00);
- SETOP(21, "ORY", 0x32, 0x00, 0x00, 0x00, 0x62, 0x00);
- SETOP(22, "OAY", 0x00, 0x00, 0x00, 0x00, 0x00, 0x33);
- SETOP(23, "ORX", 0x34, 0x94, 0x00, 0x00, 0x64, 0x00);
- SETOP(24, "OAX", 0x00, 0x00, 0x00, 0x00, 0x00, 0x35);
- SETOP(25, "SEI", 0x00, 0x00, 0x00, 0x00, 0x00, 0x38);
- SETOP(26, "BNG", 0x00, 0x00, 0x00, 0x00, 0x40, 0x00);
- SETOP(27, "XOR", 0x41, 0x4B, 0x00, 0x00, 0x49, 0x00);
- SETOP(28, "XRY", 0x42, 0xA2, 0x00, 0x00, 0x72, 0x00);
- SETOP(29, "XAY", 0x00, 0x00, 0x00, 0x00, 0x00, 0x43);
- SETOP(30, "XRX", 0x44, 0xA4, 0x00, 0x00, 0x74, 0x00);
- SETOP(31, "XAX", 0x00, 0x00, 0x00, 0x00, 0x00, 0x45);
- SETOP(32, "CLI", 0x00, 0x00, 0x00, 0x00, 0x00, 0x48);
- SETOP(33, "BCS", 0x00, 0x00, 0x00, 0x00, 0x50, 0x00);
- SETOP(34, "LSL", 0x51, 0x55, 0x00, 0x00, 0x53, 0x00);
- SETOP(35, "SEC", 0x00, 0x00, 0x00, 0x00, 0x00, 0x58);
- SETOP(36, "STA", 0x00, 0x7B, 0x8B, 0x9B, 0x5B, 0x00);
- SETOP(37, "STY", 0x00, 0x7D, 0x8D, 0x00, 0x5D, 0x00);
- SETOP(38, "STX", 0x00, 0x7E, 0x00, 0x9E, 0x5E, 0x00);
- SETOP(39, "BCC", 0x00, 0x00, 0x00, 0x00, 0x60, 0x00);
- SETOP(40, "LSR", 0x61, 0x65, 0x00, 0x00, 0x63, 0x00);
- SETOP(41, "CLC", 0x00, 0x00, 0x00, 0x00, 0x00, 0x68);
- SETOP(42, "LDA", 0x69, 0x79, 0x89, 0x99, 0x59, 0x00);
- SETOP(43, "LDY", 0x6A, 0x7A, 0x8A, 0x00, 0x5A, 0x00);
- SETOP(44, "LDX", 0x6C, 0x7C, 0x00, 0x9C, 0x5C, 0x00);
- SETOP(45, "BEQ", 0x00, 0x00, 0x00, 0x00, 0x70, 0x00);
- SETOP(46, "ROL", 0x71, 0x75, 0x00, 0x00, 0x73, 0x00);
- SETOP(47, "SSP", 0x00, 0x00, 0x00, 0x00, 0x00, 0x78);
- SETOP(48, "BNE", 0x00, 0x00, 0x00, 0x00, 0x80, 0x00);
- SETOP(49, "ROR", 0x81, 0x85, 0x00, 0x00, 0x83, 0x00);
- SETOP(50, "CSP", 0x00, 0x00, 0x00, 0x00, 0x00, 0x88);
- SETOP(51, "BVS", 0x00, 0x00, 0x00, 0x00, 0x90, 0x00);
- SETOP(52, "MUL", 0x91, 0x95, 0x00, 0x00, 0x93, 0x00);
- SETOP(53, "SEV", 0x00, 0x00, 0x00, 0x00, 0x00, 0x98);
- SETOP(54, "BVC", 0x00, 0x00, 0x00, 0x00, 0xA0, 0x00);
- SETOP(55, "DIV", 0xA1, 0xA5, 0x00, 0x00, 0xA3, 0x00);
- SETOP(56, "CLV", 0x00, 0x00, 0x00, 0x00, 0x00, 0xA8);
- SETOP(57, "RTS", 0x00, 0x00, 0x00, 0x00, 0x00, 0xB0);
- SETOP(58, "CMP", 0xB1, 0xF5, 0x00, 0x00, 0xE5, 0x00);
- SETOP(59, "CPY", 0xB2, 0xF2, 0x00, 0x00, 0xE2, 0x00);
- SETOP(60, "CAY", 0x00, 0x00, 0x00, 0x00, 0x00, 0xB3);
- SETOP(61, "CPX", 0xB4, 0xF4, 0x00, 0x00, 0xE4, 0x00);
- SETOP(62, "CAX", 0x00, 0x00, 0x00, 0x00, 0x00, 0xB5);
- SETOP(63, "ENT", 0xB8, 0x00, 0x00, 0x00, 0x00, 0x00);
- SETOP(64, "RTI", 0x00, 0x00, 0x00, 0x00, 0x00, 0xC0);
- SETOP(65, "INC", 0x00, 0xE3, 0x00, 0x00, 0xE1, 0xC1);
- SETOP(66, "INY", 0x00, 0x00, 0x00, 0x00, 0x00, 0xC2);
- SETOP(67, "IAY", 0x00, 0x00, 0x00, 0x00, 0x00, 0xC3);
- SETOP(68, "INX", 0x00, 0x00, 0x00, 0x00, 0x00, 0xC4);
- SETOP(69, "IAX", 0x00, 0x00, 0x00, 0x00, 0x00, 0xC5);
- SETOP(70, "DEC", 0x00, 0x00, 0x00, 0x00, 0x00, 0xD1);
- SETOP(71, "DEY", 0x00, 0x00, 0x00, 0x00, 0x00, 0xD2);
- SETOP(72, "DAY", 0x00, 0xF3, 0x00, 0x00, 0xF1, 0xD3);
- SETOP(73, "DEX", 0x00, 0x00, 0x00, 0x00, 0x00, 0xD4);
- SETOP(74, "DAX", 0x00, 0x00, 0x00, 0x00, 0x00, 0xD5);
- SETOP(75, "JSL", 0x00, 0x00, 0x00, 0x00, 0xE0, 0x00);
- SETOP(76, "NOP", 0x00, 0x00, 0x00, 0x00, 0x00, 0xE8);
- SETOP(77, "RTL", 0x00, 0x00, 0x00, 0x00, 0x00, 0xF0);
- SETOP(78, "BRK", 0x00, 0x00, 0x00, 0x00, 0x00, 0xF8);
+ SETOP(5, "TAY", 0x00, 0x00, 0x00, 0x00, 0x00, 0x0B);
+ SETOP(6, "PHX", 0x0C, 0x00, 0x00, 0x00, 0x00, 0x00);
+ SETOP(7, "TAX", 0x00, 0x00, 0x00, 0x00, 0x00, 0x0D);
+ SETOP(8, "TYX", 0x00, 0x00, 0x00, 0x00, 0x00, 0x0E);
+ SETOP(9, "JMP", 0x00, 0xD0, 0x00, 0x00, 0x10, 0x00);
+ SETOP(10, "SBC", 0x11, 0x15, 0x00, 0x00, 0x13, 0x00);
+ SETOP(11, "PLP", 0x18, 0x00, 0x00, 0x00, 0x00, 0x00);
+ SETOP(12, "PLA", 0x19, 0x00, 0x00, 0x00, 0x00, 0x00);
+ SETOP(13, "PLY", 0x1A, 0x00, 0x00, 0x00, 0x00, 0x00);
+ SETOP(14, "TYA", 0x00, 0x00, 0x00, 0x00, 0x00, 0x1B);
+ SETOP(15, "PLX", 0x1C, 0x00, 0x00, 0x00, 0x00, 0x00);
+ SETOP(16, "TXA", 0x00, 0x00, 0x00, 0x00, 0x00, 0x1D);
+ SETOP(17, "TXY", 0x00, 0x00, 0x00, 0x00, 0x00, 0x1E);
+ SETOP(18, "JSR", 0x00, 0x20, 0x00, 0x00, 0x00, 0x00);
+ SETOP(19, "AND", 0x21, 0x2B, 0x00, 0x00, 0x29, 0x00);
+ SETOP(20, "ANY", 0x22, 0x82, 0x00, 0x00, 0x52, 0x00);
+ SETOP(21, "AAY", 0x00, 0x00, 0x00, 0x00, 0x00, 0x23);
+ SETOP(22, "ANX", 0x24, 0x84, 0x00, 0x00, 0x54, 0x00);
+ SETOP(23, "AAX", 0x00, 0x00, 0x00, 0x00, 0x00, 0x25);
+ SETOP(24, "STT", 0x28, 0x00, 0x00, 0x00, 0x00, 0x00);
+ SETOP(25, "BPO", 0x00, 0x00, 0x00, 0x00, 0x30, 0x00);
+ SETOP(26, "ORA", 0x31, 0x3B, 0x00, 0x00, 0x39, 0x00);
+ SETOP(27, "ORY", 0x32, 0x00, 0x00, 0x00, 0x62, 0x00);
+ SETOP(28, "OAY", 0x00, 0x00, 0x00, 0x00, 0x00, 0x33);
+ SETOP(29, "ORX", 0x34, 0x94, 0x00, 0x00, 0x64, 0x00);
+ SETOP(30, "OAX", 0x00, 0x00, 0x00, 0x00, 0x00, 0x35);
+ SETOP(31, "SEI", 0x00, 0x00, 0x00, 0x00, 0x00, 0x38);
+ SETOP(32, "BNG", 0x00, 0x00, 0x00, 0x00, 0x40, 0x00);
+ SETOP(33, "XOR", 0x41, 0x4B, 0x00, 0x00, 0x49, 0x00);
+ SETOP(34, "XRY", 0x42, 0xA2, 0x00, 0x00, 0x72, 0x00);
+ SETOP(35, "XAY", 0x00, 0x00, 0x00, 0x00, 0x00, 0x43);
+ SETOP(36, "XRX", 0x44, 0xA4, 0x00, 0x00, 0x74, 0x00);
+ SETOP(37, "XAX", 0x00, 0x00, 0x00, 0x00, 0x00, 0x45);
+ SETOP(38, "CLI", 0x00, 0x00, 0x00, 0x00, 0x00, 0x48);
+ SETOP(39, "BCS", 0x00, 0x00, 0x00, 0x00, 0x50, 0x00);
+ SETOP(40, "LSL", 0x51, 0x55, 0x00, 0x00, 0x53, 0x00);
+ SETOP(41, "SEC", 0x00, 0x00, 0x00, 0x00, 0x00, 0x58);
+ SETOP(42, "STA", 0x00, 0x7B, 0x8B, 0x9B, 0x5B, 0x00);
+ SETOP(43, "STY", 0x00, 0x7D, 0x8D, 0x00, 0x5D, 0x00);
+ SETOP(44, "STX", 0x00, 0x7E, 0x00, 0x9E, 0x5E, 0x00);
+ SETOP(45, "BCC", 0x00, 0x00, 0x00, 0x00, 0x60, 0x00);
+ SETOP(46, "LSR", 0x61, 0x65, 0x00, 0x00, 0x63, 0x00);
+ SETOP(47, "CLC", 0x00, 0x00, 0x00, 0x00, 0x00, 0x68);
+ SETOP(48, "LDA", 0x69, 0x79, 0x89, 0x99, 0x59, 0x00);
+ SETOP(49, "LDY", 0x6A, 0x7A, 0x8A, 0x00, 0x5A, 0x00);
+ SETOP(50, "LDX", 0x6C, 0x7C, 0x00, 0x9C, 0x5C, 0x00);
+ SETOP(51, "BEQ", 0x00, 0x00, 0x00, 0x00, 0x70, 0x00);
+ SETOP(52, "ROL", 0x71, 0x75, 0x00, 0x00, 0x73, 0x00);
+ SETOP(53, "SSP", 0x00, 0x00, 0x00, 0x00, 0x00, 0x78);
+ SETOP(54, "BNE", 0x00, 0x00, 0x00, 0x00, 0x80, 0x00);
+ SETOP(55, "ROR", 0x81, 0x85, 0x00, 0x00, 0x83, 0x00);
+ SETOP(56, "CSP", 0x00, 0x00, 0x00, 0x00, 0x00, 0x88);
+ SETOP(57, "BVS", 0x00, 0x00, 0x00, 0x00, 0x90, 0x00);
+ SETOP(58, "MUL", 0x91, 0x95, 0x00, 0x00, 0x93, 0x00);
+ SETOP(59, "SEV", 0x00, 0x00, 0x00, 0x00, 0x00, 0x98);
+ SETOP(60, "BVC", 0x00, 0x00, 0x00, 0x00, 0xA0, 0x00);
+ SETOP(61, "DIV", 0xA1, 0xA5, 0x00, 0x00, 0xA3, 0x00);
+ SETOP(62, "CLV", 0x00, 0x00, 0x00, 0x00, 0x00, 0xA8);
+ SETOP(63, "RTS", 0x00, 0x00, 0x00, 0x00, 0x00, 0xB0);
+ SETOP(64, "CMP", 0xB1, 0xF5, 0x00, 0x00, 0xE5, 0x00);
+ SETOP(65, "CPY", 0xB2, 0xF2, 0x00, 0x00, 0xE2, 0x00);
+ SETOP(66, "CAY", 0x00, 0x00, 0x00, 0x00, 0x00, 0xB3);
+ SETOP(67, "CPX", 0xB4, 0xF4, 0x00, 0x00, 0xE4, 0x00);
+ SETOP(68, "CAX", 0x00, 0x00, 0x00, 0x00, 0x00, 0xB5);
+ SETOP(69, "ENT", 0xB8, 0x00, 0x00, 0x00, 0x00, 0x00);
+ SETOP(70, "RTI", 0x00, 0x00, 0x00, 0x00, 0x00, 0xC0);
+ SETOP(71, "INC", 0x00, 0xE3, 0x00, 0x00, 0xE1, 0xC1);
+ SETOP(72, "INY", 0x00, 0x00, 0x00, 0x00, 0x00, 0xC2);
+ SETOP(73, "IAY", 0x00, 0x00, 0x00, 0x00, 0x00, 0xC3);
+ SETOP(74, "INX", 0x00, 0x00, 0x00, 0x00, 0x00, 0xC4);
+ SETOP(75, "IAX", 0x00, 0x00, 0x00, 0x00, 0x00, 0xC5);
+ SETOP(76, "DEC", 0x00, 0x00, 0x00, 0x00, 0x00, 0xD1);
+ SETOP(77, "DEY", 0x00, 0x00, 0x00, 0x00, 0x00, 0xD2);
+ SETOP(78, "DAY", 0x00, 0xF3, 0x00, 0x00, 0xF1, 0xD3);
+ SETOP(79, "DEX", 0x00, 0x00, 0x00, 0x00, 0x00, 0xD4);
+ SETOP(80, "DAX", 0x00, 0x00, 0x00, 0x00, 0x00, 0xD5);
+ SETOP(81, "JSL", 0x00, 0x00, 0x00, 0x00, 0xE0, 0x00);
+ SETOP(82, "NOP", 0x00, 0x00, 0x00, 0x00, 0x00, 0xE8);
+ SETOP(83, "RTL", 0x00, 0x00, 0x00, 0x00, 0x00, 0xF0);
+ SETOP(84, "BRK", 0x00, 0x00, 0x00, 0x00, 0x00, 0xF8);
uint8_t done = 0;
uint64_t address = 0x0000;
while (!(done & 1)) {
@@ -228,7 +235,7 @@ int asmmon() {
}
if (ins != NULL && !(done & 6)) {
uint8_t i;
- for (i = 0; i < 77; i++) {
+ for (i = 0; i < OPNUM; i++) {
if (strcasecmp(opcodes[i].mnemonic, ins) == 0) {
if (addrmode == 0 && (opcodes[i].impl || opcodes[i].impl == CPS)) {
done |= 8;
diff --git a/opcode.h b/opcode.h
index 1f84763..ae637d4 100644
--- a/opcode.h
+++ b/opcode.h
@@ -9,13 +9,19 @@
#define PHP 0x08 /* PusH Processor status to stack. */
#define PHA 0x09 /* PusH Accumulator to stack. */
#define PHY 0x0A /* PusH Y register to stack. */
+#define TAY 0x0B /* Transfer Accumulator to Y. */
#define PHX 0x0C /* PusH X register to stack. */
+#define TAX 0x0D /* Transfer Accumulator to X. */
+#define TYX 0x0E /* Transfer Y to X. */
#define JMP 0x10 /* JuMP to memory location. */
#define SBC 0x11 /* SuBtract with Carry. */
#define PLP 0x18 /* PuLl Processor status from stack. */
#define PLA 0x19 /* PuLl Accumulator from stack. */
#define PLY 0x1A /* PuLl Y register from stack. */
+#define TYA 0x1B /* Transfer Y to Accumulator. */
#define PLX 0x1C /* PuLl X register from stack. */
+#define TXA 0x1D /* Transfer X to Accumulator. */
+#define TXY 0x1E /* Transfer X to Y. */
#define JSR 0x20 /* Jump to SubRoutine. */
#define AND 0x21 /* bitwise AND with accumulator. */
#define ANY 0x22 /* bitwise ANd with Y register.*/
@@ -126,7 +132,10 @@ static const char *opname[0x100] = {
OPNAME(PHP),
OPNAME(PHA),
OPNAME(PHY),
+ OPNAME(TAY),
OPNAME(PHX),
+ OPNAME(TAX),
+ OPNAME(TYX),
OPNAME(JMP),
[SBC] = "SBC #",
[0x13] = "SBC a",
@@ -134,7 +143,10 @@ static const char *opname[0x100] = {
OPNAME(PLP),
OPNAME(PLA),
OPNAME(PLY),
+ OPNAME(TYA),
OPNAME(PLX),
+ OPNAME(TXA),
+ OPNAME(TXY),
OPNAME(JSR),
[AND] = "AND #",
[ANY] = "ANY #",
diff --git a/sux.c b/sux.c
index 4df60cb..08f5ebe 100644
--- a/sux.c
+++ b/sux.c
@@ -17,7 +17,6 @@ uint8_t threads_done = 0;
uint8_t lines[THREADS];
pthread_mutex_t mutex = PTHREAD_MUTEX_INITIALIZER;
pthread_cond_t cond = PTHREAD_COND_INITIALIZER;
-pthread_barrier_t bar;
struct suxthr {
struct sux sx;
uint8_t th;
@@ -175,6 +174,39 @@ void *run(void *args) {
addr[0xFF91] = cpu->sp >> 8;
}
break;
+ case TAY: /* Transfer Accumulator to Y. */
+ case TAX: /* Transfer Accumulator to Y. */
+ case TYX: /* Transfer Y to X. */
+ case TYA: /* Transfer Y to Accumulator. */
+ case TXA: /* Transfer X to Accumulator. */
+ case TXY: /* Transfer X to Y. */
+ if (opcode == TAY)
+ cpu->y[thread] = cpu->a[thread];
+ if (opcode == TAX)
+ cpu->x[thread] = cpu->a[thread];
+ if (opcode == TYX)
+ cpu->x[thread] = cpu->y[thread];
+ if (opcode == TYA)
+ cpu->a[thread] = cpu->y[thread];
+ if (opcode == TXA)
+ cpu->a[thread] = cpu->x[thread];
+ if (opcode == TXY)
+ cpu->y[thread] = cpu->x[thread];
+ if (opcode == TYA || opcode == TXA) {
+ cpu->z[thread] = (cpu->a[thread] == 0);
+ cpu->n[thread] = (cpu->a[thread] >> 63);
+ }
+ if (opcode == TAY || opcode == TXY) {
+ cpu->z[thread] = (cpu->y[thread] == 0);
+ cpu->n[thread] = (cpu->y[thread] >> 63);
+ }
+ if (opcode == TAX || opcode == TYX) {
+ cpu->z[thread] = (cpu->x[thread] == 0);
+ cpu->n[thread] = (cpu->x[thread] >> 63);
+ }
+ (cpu->z[thread]) ? (cpu->ps |= (Z << 8*thread)) : (cpu->ps &= ~(Z << 8*thread));
+ (cpu->n[thread]) ? (cpu->ps |= (N << 8*thread)) : (cpu->ps &= ~(N << 8*thread));
+ break;
case PHX: /* PusH X register to stack. */
tmp = addr[cpu->pc[thread]++];
if (tmp > 7)
@@ -1413,7 +1445,6 @@ int main(int argc, char **argv) {
inst[i] = 0;
}
pthread_t therads[THREADS];
- pthread_barrier_init(&bar, NULL, THREADS);
int result;
puts("\033[2J\033[H");
for (int i = 0; i < THREADS; i++) {
@@ -1425,7 +1456,6 @@ int main(int argc, char **argv) {
pthread_cond_wait(&cond, &mutex);
}
pthread_mutex_unlock(&mutex);
- pthread_barrier_destroy(&bar);
#if bench
if (threads_done == THREADS) {
double tm_sec, tm_usec, tm[THREADS], ttm;
diff --git a/test/reg-transfer.s b/test/reg-transfer.s
new file mode 100644
index 0000000..580020c
--- /dev/null
+++ b/test/reg-transfer.s
@@ -0,0 +1,23 @@
+; Test register transfer instructions.
+;
+; by mr b0nk 500 <b0nk @b0nk.xyz>
+
+cps
+inc ; Increment the accumulator.
+tay ; Transfer the accumulator to the y register.
+tax ; Do the same thing, but with the x register.
+jmp $1 ; Loop forever.
+
+.org $8000
+cps
+inc ; Increment the accumulator.
+tay ; Transfer the accumulator to the y register.
+tax ; Do the same thing, but with the x register.
+jmp $1 ; Loop forever.
+
+.org $FF50
+.qword $8000
+
+; Execute the program.
+done
+
generated by cgit v1.2.3-13-gbd6f (git 2.30.0) at 2024-12-26 03:43:24 +0000