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#
# Copyright (C) 2011 EADS France, Fabrice Desclaux <fabrice.desclaux@eads.net>
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License along
# with this program; if not, write to the Free Software Foundation, Inc.,
# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
#
from miasm.core.asmbloc import *
from shlex import shlex
declarator = {'byte':'B', 'long':'I'}
def guess_next_new_label(symbol_pool, gen_label_index = 0):
i = 0
while True:
l = symbol_pool.getby_name(i)
if l == None:
return symbol_pool.add_label(i)
i+=1
def parse_txt(mnemo, txt, symbol_pool = None, gen_label_index = 0):
if symbol_pool == None:
symbol_pool = asm_symbol_pool()
lines_text = []
lines_data = []
lines_bss = []
lines=lines_text
#parse each line
for line in txt.split('\n'):
#empty
if re.match(r'\s*$', line):
continue
#comment
if re.match(r'\s*;\S*', line):
continue
#directive
if re.match(r'\s*\.', line):
r = re.match(r'\s*\.(\S+)', line)
directive = r.groups()[0]
if directive == 'text':
lines = lines_text
continue
if directive == 'data':
lines = lines_data
continue
if directive == 'bss':
lines = lines_bss
continue
if directive in ['string', 'ascii']:
#XXX HACK
line = line.replace(r'\n', '\n').replace(r'\r', '\r')
raw = line[line.find(r'"')+1:line.rfind(r"'")]
if directive == 'string':
raw+="\x00"
lines.append(asm_raw(raw))
continue
if directive == 'ustring':
#XXX HACK
line = line.replace(r'\n', '\n').replace(r'\r', '\r')
raw = line[line.find(r'"')+1:line.rfind(r"'")]+"\x00"
raw = "".join(map(lambda x:x+'\x00', raw))
lines.append(asm_raw(raw))
continue
if directive in declarator:
data_raw = [x for x in shlex(line[r.end():]) if not x in ',']
data_int = []
for b in data_raw:
if re.search(r'0x', b):
data_int.append(int(b, 16))
else:
data_int.append(int(b))
raw = reduce(lambda x,y:x+struct.pack(declarator[directive], y), data_int, "")
lines.append(asm_raw(raw))
continue
if directive == 'split': #custom command
lines.append(asm_raw(line.strip()))
continue
raise ValueError("unknown directive %s"%str(directive))
#label
r = re.match(r'\s*(\S+)\s*:', line)
if r:
l = r.groups()[0]
l = symbol_pool.getby_name_create(l)
lines.append(l)
continue
#code
if ';' in line:
line = line[:line.find(';')]
prefix, name, args = mnemo.parse_mnemo(line)
#print prefix, name, args
args = [mnemo.parse_address(a) for a in args]
#pool symbols
for a in args:
if mnemo.has_symb(a):
symbs = mnemo.get_symbols(a)
symbs_dct = {}
for s, count in symbs:
if isinstance(s, asm_label):
continue
l = symbol_pool.getby_name_create(s)
symbs_dct[s] = l
mnemo.names2symbols(a, symbs_dct)
if mnemo.rebuilt_inst:
candidates=dict([[len(x),x] for x in mnemo.asm(line)])
if not candidates:
raise ValueError('cannot asm %s'%str(line))
c = candidates[min(candidates.keys())]
c+=mnemo.prefix2hex(prefix)
instr = mnemo.dis(c)
else:
instr = mnemo.asm_instr(line)
instr.arg = args
lines.append(instr)
log_asmbloc.info( "___pre asm oki___")
#make blocs
#gen_label_index = 0
all_blocs_sections = []
bloc_num = 0
for lines in [lines_text, lines_data, lines_bss]:
state = 0
i = 0
all_blocs = []
all_blocs_sections.append(all_blocs)
bloc_to_nlink = None
block_may_link = False
while i <len(lines):
#no current bloc
if state == 0:
if not isinstance(lines[i], asm_label):
l = guess_next_new_label(symbol_pool)
lines[i:i] = [l]
else:
l = lines[i]
b = asm_bloc(l)
b.bloc_num = bloc_num
bloc_num+=1
all_blocs.append(b)
state = 1
i+=1
if bloc_to_nlink:
bloc_to_nlink.addto(asm_constraint(b.label, asm_constraint.c_next))
bloc_to_nlink = None
#in bloc
elif state == 1:
#asm_raw
if isinstance(lines[i], asm_raw):
if lines[i].raw.startswith('.split'):
state = 0
block_may_link = False
i+=1
else:
b.addline(lines[i])
i+=1
#asm_label
elif isinstance(lines[i], asm_label):
if block_may_link:
b.addto(asm_constraint(lines[i], asm_constraint.c_next))
block_may_link = False
state = 0
#instruction
else:
b.addline(lines[i])
if lines[i].dstflow():
mydst = lines[i].arg
if len(mydst)==1 and mnemo.get_symbols(mydst[0]):
arg = dict(mydst[0])
symbs = mnemo.get_symbols(arg)
"""
TODO XXX redo this (as many miasm parts)
"""
l = symbs[0][0]
lines[i].setdstflow([l])
b.addto(asm_constraint(l, asm_constraint.c_to))
# TODO XXX redo this really
if not lines[i].breakflow() and i+1 < len(lines):
if isinstance(lines[i+1], asm_label):
l = lines[i+1]
else:
l = guess_next_new_label(symbol_pool)
lines[i+1:i+1] = [l]
else:
state = 0
if lines[i].splitflow():
bloc_to_nlink = b
if not lines[i].breakflow() or lines[i].splitflow():
block_may_link = True
else:
block_may_link = False
i+=1
for b in all_blocs_sections[0]:
log_asmbloc.info( b)
return all_blocs_sections, symbol_pool
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