diff options
Diffstat (limited to 'devtools/tasmrecover/tasm/parser.py')
| -rw-r--r-- | devtools/tasmrecover/tasm/parser.py | 261 |
1 files changed, 261 insertions, 0 deletions
diff --git a/devtools/tasmrecover/tasm/parser.py b/devtools/tasmrecover/tasm/parser.py new file mode 100644 index 0000000000..4cea496722 --- /dev/null +++ b/devtools/tasmrecover/tasm/parser.py @@ -0,0 +1,261 @@ +import os, re +from proc import proc +import lex +import op + +class parser: + def __init__(self): + self.strip_path = 0 + self.__globals = {} + self.__offsets = {} + self.__stack = [] + self.proc = None + self.proc_list = [] + self.binary_data = [] + + self.symbols = [] + self.link_later = [] + + def visible(self): + for i in self.__stack: + if not i or i == 0: + return False + return True + + def push_if(self, text): + value = self.eval(text) + #print "if %s -> %s" %(text, value) + self.__stack.append(value) + + def push_else(self): + #print "else" + self.__stack[-1] = not self.__stack[-1] + + def pop_if(self): + #print "endif" + return self.__stack.pop() + + def set_global(self, name, value): + if len(name) == 0: + raise Exception("empty name is not allowed") + name = name.lower() + #print "adding global %s -> %s" %(name, value) + if self.__globals.has_key(name): + raise Exception("global %s was already defined", name) + self.__globals[name] = value + + def get_global(self, name): + name = name.lower() + g = self.__globals[name] + g.used = True + return g + + def get_globals(self): + return self.__globals + + def has_global(self, name): + name = name.lower() + return self.__globals.has_key(name) + + def set_offset(self, name, value): + if len(name) == 0: + raise Exception("empty name is not allowed") + name = name.lower() + #print "adding global %s -> %s" %(name, value) + if self.__offsets.has_key(name): + raise Exception("global %s was already defined", name) + self.__offsets[name] = value + + def get_offset(self, name): + name = name.lower() + return self.__offsets[name] + + def include(self, basedir, fname): + path = fname.split('\\')[self.strip_path:] + path = os.path.join(basedir, os.path.pathsep.join(path)) + #print "including %s" %(path) + + self.parse(path) + + def eval(self, stmt): + try: + return self.parse_int(stmt) + except: + pass + value = self.__globals[stmt.lower()].value + return int(value) + + def expr_callback(self, match): + name = match.group(1).lower() + g = self.get_global(name) + if isinstance(g, op.const): + return g.value + else: + return "0x%04x" %g.offset + + def eval_expr(self, expr): + n = 1 + while n > 0: + expr, n = re.subn(r'\b([a-zA-Z_]+[a-zA-Z0-9_]*)', self.expr_callback, expr) + return eval(expr) + + def expand_globals(self, text): + return text + + def fix_dollar(self, v): + print("$ = %d" %len(self.binary_data)) + return re.sub(r'\$', "%d" %len(self.binary_data), v) + + def parse_int(self, v): + if re.match(r'[01]+b$', v): + v = int(v[:-1], 2) + if re.match(r'[\+-]?[0-9a-f]+h$', v): + v = int(v[:-1], 16) + return int(v) + + def compact_data(self, width, data): + #print "COMPACTING %d %s" %(width, data) + r = [] + base = 0x100 if width == 1 else 0x10000 + for v in data: + if v[0] == '"': + if v[-1] != '"': + raise Exception("invalid string %s" %v) + if width == 2: + raise Exception("string with data width more than 1") #we could allow it :) + for i in xrange(1, len(v) - 1): + r.append(ord(v[i])) + continue + + m = re.match(r'(\w+)\s+dup\s+\((\s*\S+\s*)\)', v) + if m is not None: + #we should parse that + n = self.parse_int(m.group(1)) + if m.group(2) != '?': + value = self.parse_int(m.group(2)) + else: + value = 0 + for i in xrange(0, n): + v = value + for b in xrange(0, width): + r.append(v & 0xff); + v >>= 8 + continue + + try: + v = self.parse_int(v) + if v < 0: + v += base + except: + #global name + print "global/expr: %s" %v + try: + g = self.get_global(v) + v = g.offset + except: + print "unknown address %s" %(v) + self.link_later.append((len(self.binary_data) + len(r), v)) + v = 0 + + for b in xrange(0, width): + r.append(v & 0xff); + v >>= 8 + #print r + return r + + def parse(self, fname): +# print "opening file %s..." %(fname, basedir) + fd = open(fname, 'rb') + for line in fd: + line = line.strip() + if len(line) == 0 or line[0] == ';' or line[0] == chr(0x1a): + continue + + #print line + m = re.match('(\w+)\s*?:', line) + if m is not None: + line = line[len(m.group(0)):].strip() + if self.visible(): + name = m.group(1) + if self.proc is not None: + self.proc.add_label(name) + print "offset %s -> %d" %(name, len(self.binary_data)) + self.set_offset(name, (len(self.binary_data), self.proc, len(self.proc.stmts) if self.proc is not None else 0)) + #print line + + cmd = line.split() + if len(cmd) == 0: + continue + + cmd0 = str(cmd[0]) + if cmd0 == 'if': + self.push_if(cmd[1]) + continue + elif cmd0 == 'else': + self.push_else() + continue + elif cmd0 == 'endif': + self.pop_if() + continue + + if not self.visible(): + continue + + if cmd0 == 'db' or cmd0 == 'dw' or cmd0 == 'dd': + arg = line[len(cmd0):].strip() + print "%d:1: %s" %(len(self.binary_data), arg) #fixme: COPYPASTE + binary_width = {'b': 1, 'w': 2, 'd': 4}[cmd0[1]] + self.binary_data += self.compact_data(binary_width, lex.parse_args(arg)) + continue + elif cmd0 == 'include': + self.include(os.path.dirname(fname), cmd[1]) + continue + elif cmd0 == 'endp': + self.proc = None + continue + elif cmd0 == 'assume': + print "skipping: %s" %line + continue + elif cmd0 == 'rep': + self.proc.add(cmd0) + self.proc.add(" ".join(cmd[1:])) + continue + + if len(cmd) >= 3: + cmd1 = cmd[1] + if cmd1 == 'equ': + v = cmd[2] + self.set_global(cmd0, op.const(self.fix_dollar(v))) + elif cmd1 == 'db' or cmd1 == 'dw' or cmd1 == 'dd': + binary_width = {'b': 1, 'w': 2, 'd': 4}[cmd1[1]] + offset = len(self.binary_data) + arg = line[len(cmd0):].strip() + arg = arg[len(cmd1):].strip() + print "%d: %s" %(offset, arg) + self.binary_data += self.compact_data(binary_width, lex.parse_args(arg)) + self.set_global(cmd0.lower(), op.var(binary_width, offset)) + continue + elif cmd1 == 'proc': + name = cmd0.lower() + self.proc = proc(name) + print "procedure %s, #%d" %(name, len(self.proc_list)) + self.proc_list.append(name) + self.set_global(name, self.proc) + continue + if (self.proc): + self.proc.add(line) + else: + #print line + pass + + fd.close() + return self + + def link(self): + for addr, expr in self.link_later: + v = self.eval_expr(expr) + print "link: patching %04x -> %04x" %(addr, v) + while v != 0: + self.binary_data[addr] = v & 0xff + addr += 1 + v >>= 8 |