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import json
import readline
import sys
import urllib
URL_PREFIX = "http://localhost:6502"
def get(url):
return json.loads(urllib.urlopen(URL_PREFIX + url).read())
def post(url, data=None):
return urllib.urlopen(URL_PREFIX + url, json.dumps(data) if data is not None else "")
def value(s):
if s.startswith("$"):
return int(s[1:], 16)
if s.startswith("0x"):
return int(s[2:], 16)
return int(s)
def format_disassemble(dis):
r = "%04X- " % dis["address"]
for i in range(3):
if i < len(dis["bytes"]):
r += "%02X " % dis["bytes"][i]
else:
r += " "
r += " %s" % dis["mnemonic"]
if "operand" in dis:
r += " %-10s" % dis["operand"]
if "memory" in dis:
r += "[%04X] = %0*X" % tuple(dis["memory"])
return r
def cmd_disassemble(a):
"""Disassemble"""
if len(a) > 1:
addr = value(a[1])
else:
status = get("/status")
addr = status["program_counter"]
disasm = get("/disassemble/%d" % addr)
for d in disasm:
print format_disassemble(d)
def cmd_dump(a):
"""Dump memory"""
start = value(a[1])
if len(a) > 2:
end = value(a[2])
else:
end = start + 15
data = get("/memory/%d-%d" % (start, end))
addr = start & ~0xF
while addr <= end:
s = "%04X-" % addr
for i in range(16):
if start <= addr + i <= end:
s += " %02X" % data[addr + i - start]
else:
s += " "
s += " "
for i in range(16):
if start <= addr + i <= end:
c = data[addr + i - start]
# adjust for apple character set
c &= 0x3f
if c < 0x20:
c += 0x40
if 0x20 <= c < 0x7f:
s += chr(c)
else:
s += "."
else:
s += " "
print s
addr += 16
def cmd_help(a):
"""Help commands"""
if len(a) > 1:
f = Commands.get(a[1])
if f is not None:
print f.__doc__
else:
print "Unknown command:", a[1]
else:
print "Commands:"
for c in sorted(Commands):
print " ", c
def cmd_peek(a):
"""Peek memory location"""
addr = value(a[1])
dump = get("/memory/%d" % addr)
print "%04X: %02X" % (addr, dump[0])
def cmd_poke(a):
"""Poke memory location"""
addr = value(a[1])
val = value(a[2])
post("/memory/%d" % addr, [val])
def cmd_status(a):
"""CPU status"""
status = get("/status")
print "A=%02X X=%02X Y=%02X S=%02X PC=%04X F=%c%c0%c%c%c%c%c" % (
status["accumulator"],
status["x_index"],
status["y_index"],
status["stack_pointer"],
status["program_counter"],
"N" if status["sign_flag"] else "n",
"V" if status["overflow_flag"] else "v",
"B" if status["break_flag"] else "b",
"D" if status["decimal_mode_flag"] else "d",
"I" if status["interrupt_disable_flag"] else "i",
"Z" if status["zero_flag"] else "z",
"C" if status["carry_flag"] else "c",
)
disasm = get("/disassemble/%d" % status["program_counter"])
print format_disassemble(disasm[0])
def cmd_quit(a):
"""Quit"""
sys.exit(0)
def cmd_reset(a):
"""Reset"""
post("/reset")
Commands = {
"disassemble": cmd_disassemble,
"dump": cmd_dump,
"help": cmd_help,
"peek": cmd_peek,
"poke": cmd_poke,
"status": cmd_status,
"quit": cmd_quit,
"reset": cmd_reset,
}
def main():
print "ApplePy control console"
while True:
s = raw_input("6502> ")
a = s.strip().split()
f = Commands.get(a[0])
if f is not None:
f(a)
else:
print "Unknown command:", s
if __name__ == "__main__":
main()
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