def current_line(self):
if self.is_optimized_out():
return '(frame information optimized out)'
filename = self.filename()
inferior_cwd = '/proc/%d/cwd' % gdb.selected_inferior().pid
if filename.startswith('/dev/fd/'):
filename.replace('/dev/fd/',
'/proc/%d/fd/' % gdb.selected_inferior().pid,
1)
else:
filename = os.path.join(inferior_cwd, filename)
try:
sourcefile = self.OpenFile(filename)
except IOError:
# couldn't find the file, let's try extracting the path from the frame
filename = self.extract_filename()
if filename.endswith('.pyc'):
filename = filename[:-1]
try:
sourcefile = self.OpenFile(filename)
except IOError:
return '<file not available>'
for _ in xrange(self.current_line_num()):
line = sourcefile.readline()
sourcefile.close()
return line if line else '<file not available>'
def _next_instn_jump_len(gdb_frame):
'-> None means don\'t jump'
try:
arch_name = gdb_frame.architecture().name()
except AttributeError:
arch_name = None
if arch_name.startswith('powerpc:'):
# 'powerpc:common64' on ppc64 big endian
i = bytes(gdb.selected_inferior().read_memory(gdb.parse_and_eval('$pc'), 4))
if (i == b'\x7d\x82\x10\x08') or (i == b'\x08\x10\x82\x7d'):
return 4
else: # not stopped on a breakpoint instruction
return None
triplet = _target_triplet()
if re.match(r'^arm-', triplet):
i = bytes(gdb.selected_inferior().read_memory(gdb.parse_and_eval('$pc'), 4))
if i == b'\xf0\x01\xf0\xe7':
return 4
elif i.startswith(b'\x01\xde'):
return 2
elif i == b'\xf0\xf7\x00\xa0 ':
# 'arm_linux_thumb2_le_breakpoint' from arm-linux-tdep.c in GDB
return 4
else: # not stopped on a breakpoint instruction
return None
return None
def invoke(self, *args):
self.process.set_inferior(gdb.selected_inferior(), gdb.selected_thread())
selected_thread = gdb.selected_thread()
if selected_thread is None:
raise Exception("You are calling the 'NotifySyscall' function with no thread running. This should never happen because only the catchpoint-syscall should call this function and by definition those require an running thread.")
my_id = (gdb.selected_inferior().num, selected_thread.num)
syscall_tracer = self._syscall_tracer_by_invokation_id.get(my_id)
am_at_syscall_enter = syscall_tracer is None # if None no tracing was started so we must be at the enter of a syscall
if am_at_syscall_enter:
syscall_tracer = PtraceSyscallPublisher(self.gdb_module, self.process, Opts())
self._syscall_tracer_by_invokation_id[my_id] = syscall_tracer # save this tracer to be called at the syscall's exit
syscall_tracer.enter()
else:
syscall_tracer = self._syscall_tracer_by_invokation_id[my_id] # created at the syscall's enter
syscall_tracer.exit()
del self._syscall_tracer_by_invokation_id[my_id] # clean up
# publish the data from the syscall's enter/exit
syscall_tracer.publish_syscall()
return False
def setup_tasks(self):
init_task = gdb.lookup_global_symbol('init_task')
task_list = init_task.value()['tasks']
self.pid_to_task_struct = {}
for task in list_for_each_entry(task_list, init_task.type, 'tasks'):
thread = gdb.selected_inferior().new_thread((1, task['pid'], 0), task)
thread.name = task['comm'].string()
gdb.selected_inferior().executing = False
def dereference(self, pointer, target_id=0):
"""
Recursively dereference a pointer for display
"""
if isinstance(pointer, six.integer_types):
fmt = ('<' if self.get_byte_order() == 'little' else '>') + {2: 'H', 4: 'L', 8: 'Q'}[self.get_addr_size()]
addr = pointer
chain = []
# recursively dereference
while True:
try:
mem = gdb.selected_inferior().read_memory(addr, self.get_addr_size())
(ptr,) = struct.unpack(fmt, mem)
if ptr in [x[1] for x in chain]:
break
chain.append(('pointer', addr))
addr = ptr
except gdb.MemoryError:
log.exception("Dereferencing pointer 0x{:X}".format(addr))
break
except OverflowError:
log.exception("Dereferencing pointer 0x{:X}".format(addr))
break
# get some info for the last pointer
# first try to resolve a symbol context for the address
if len(chain):
p, addr = chain[-1]
output = gdb.execute('info symbol 0x{:x}'.format(addr), to_string=True)
log.debug('output = {}'.format(output))
if 'No symbol matches' not in output:
chain.append(('symbol', output.strip()))
log.debug("symbol context: {}".format(str(chain[-1])))
else:
log.debug("no symbol context, trying as a string")
mem = gdb.selected_inferior().read_memory(addr, 2)
if ord(mem[0]) <= 127 and ord(mem[0]) != 0:
a = []
for i in range(0, self.max_string):
mem = gdb.selected_inferior().read_memory(addr + i, 1)
if ord(mem[0]) == 0 or ord(mem[0]) > 127:
break
if isinstance(mem, memoryview):
a.append(mem.tobytes().decode('latin1'))
else:
a.append(str(mem))
chain.append(('string', ''.join(a)))
log.debug("chain: {}".format(chain))
else:
chain = []
return chain
def setup_tasks(self):
init_task = gdb.lookup_global_symbol('init_task')
task_list = init_task.value()['tasks']
runqueues = gdb.lookup_global_symbol('runqueues')
rqs = get_percpu_var(runqueues)
rqscurrs = {long(x["curr"]) : k for (k, x) in rqs.items()}
self.pid_to_task_struct = {}
print("Loading tasks...", end='')
sys.stdout.flush()
task_count = 0
tasks = []
for taskg in list_for_each_entry(task_list, init_task.type, 'tasks'):
tasks.append(taskg)
for task in list_for_each_entry(taskg['thread_group'], init_task.type, 'thread_group'):
tasks.append(task)
for task in tasks:
cpu = None
regs = None
active = long(task.address) in rqscurrs
if active:
cpu = rqscurrs[long(task.address)]
regs = self.kdump.attr.cpu[cpu].reg
ltask = LinuxTask(task, active, cpu, regs)
ptid = (LINUX_KERNEL_PID, task['pid'], 0)
try:
thread = gdb.selected_inferior().new_thread(ptid, ltask)
except gdb.error as e:
print("Failed to setup task @{:#x}".format(long(task.address)))
continue
thread.name = task['comm'].string()
self.arch.setup_thread_info(thread)
ltask.attach_thread(thread)
ltask.set_get_stack_pointer(self.arch.get_stack_pointer)
crash.cache.tasks.cache_task(ltask)
task_count += 1
if task_count % 100 == 0:
print(".", end='')
sys.stdout.flush()
print(" done. ({} tasks total)".format(task_count))
gdb.selected_inferior().executing = False
def stop(self):
buf_size = gdb.parse_and_eval(self.size)
mod_count = int(math.floor(buf_size * 8 * gdb.parse_and_eval(self.factor)))
if mod_count < 1: mod_count = 1
for i in range(0, mod_count):
offset = random.randint(0,buf_size-1)
rand_byte = gdb.parse_and_eval('%s + %d' % (self.target, offset))
buf = gdb.selected_inferior().read_memory(rand_byte, 1)
orig = struct.unpack('B', buf[0])[0]
rand_bit = random.randint(0,7)
update = (orig ^ (1 << rand_bit))
gdb.selected_inferior().write_memory(rand_byte, chr(update), 1)
return False
def invoke(self, arg='', from_tty=False, sig=0):
gdb.newest_frame().select()
regs = [0] * 19
# parse_and_eval seems to be the only way to access target registers
for i in range(16):
regs[i] = int(gdb.parse_and_eval("(unsigned long)$r%d" % i))
regs[16] = int(gdb.parse_and_eval("(unsigned long)$xpsr"))
# Don't know how to include other registers in core dump
prstatus = ARM_prstatus()
prstatus.pr_cursig = sig
# Is it possible to include a target register description?
notes = note_desc("CORE", 1, prstatus.dumps() + struct.pack("<19L", *regs))
inf = gdb.selected_inferior()
# How do we query the memory map from GDB?
# TODO: Use 'info mem'
ram = inf.read_memory(0x20000000, 128*1024)
ccmram = inf.read_memory(0x10000000, 64*1024)
scs = inf.read_memory(0xE000ED00, 0x40)
core = CoreFile()
core.set_type(Elf32_Ehdr.ET_CORE)
core.set_machine(0x28) #ARM
core.add_program(Elf32_Phdr.PT_NOTE, 0, notes)
core.add_program(Elf32_Phdr.PT_LOAD, 0x10000000, ccmram)
core.add_program(Elf32_Phdr.PT_LOAD, 0x20000000, ram)
core.add_program(Elf32_Phdr.PT_LOAD, 0xE000ED00, scs)
fn = arg if arg else gcore_file_name.value
fn += "-" + time.strftime("%y%m%d-%H%M%S")
core.dump(open(fn, "w"))
print "(core dumped to %r)" % fn
def invoke(self, arg, from_tty):
args = gdb.string_to_argv(arg)
# generally, we type "plot someimage" in the GDB commandline
# where "someimage" is an instance of cv::Mat
v = gdb.parse_and_eval(args[0])
# the value v is a gdb.Value object of C++
# code's cv::Mat, we need to translate to
# a python object under cv2.cv
image_size = (v['cols'],v['rows'])
# print v
# these two below lines do not work. I don't know why
# channel = gdb.execute("call "+ args[0] + ".channels()", False, True)
# channel = v.channels();
CV_8U =0
CV_8S =1
CV_16U=2
CV_16S=3
CV_32S=4
CV_32F=5
CV_64F=6
CV_USRTYPE1=7
CV_CN_MAX = 512
CV_CN_SHIFT = 3
CV_MAT_CN_MASK = (CV_CN_MAX - 1) << CV_CN_SHIFT
flags = v['flags']
channel = (((flags) & CV_MAT_CN_MASK) >> CV_CN_SHIFT) + 1
CV_DEPTH_MAX = (1 << CV_CN_SHIFT)
CV_MAT_DEPTH_MASK = CV_DEPTH_MAX - 1
depth = (flags) & CV_MAT_DEPTH_MASK
IPL_DEPTH_SIGN = 0x80000000
cv_elem_size = (((4<<28)|0x8442211) >> depth*4) & 15
if (depth == CV_8S or depth == CV_16S or depth == CV_32S):
mask = IPL_DEPTH_SIGN
else:
mask = 0
ipl_depth = cv_elem_size*8 | mask
img = cv.CreateImageHeader(image_size, ipl_depth, channel)
# conver the v['data'] type to "char*" type
char_type = gdb.lookup_type("char")
char_pointer_type =char_type.pointer()
buffer = v['data'].cast(char_pointer_type)
# read bytes from inferior's memory, because
# we run the opencv-python module in GDB's own process
# otherwise, we use memory corss processes
buf = v['step']['buf']
bytes = buf[0] * v['rows'] # buf[0] is the step? Not quite sure.
inferior = gdb.selected_inferior()
mem = inferior.read_memory(buffer, bytes)
# set the img's raw data
cv.SetData(img, mem)
mat = np.asarray(img[:,:])
print ("Type: {}".format(mat.dtype))
print (mat)
def invoke(self, arg, from_tty):
args = gdb.string_to_argv(arg)
v = gdb.parse_and_eval(args[0])
strType = gdb.execute("print "+ args[0] + ".type()", False, True)
# strType contains gdb answers as a string of the form "$2 = 42"
img = cv.CreateMat(v['rows'], v['cols'], int(strType.split(" ")[2]))
# convert v['data'] to char*
char_type = gdb.lookup_type("char")
char_pointer_type = char_type.pointer()
buffer = v['data'].cast(char_pointer_type)
# read bytes from inferior's process memory
buf = v['step']['buf']
bytes = buf[0] * v['rows']
inferior = gdb.selected_inferior()
mem = inferior.read_memory(buffer, bytes)
# set the matrix raw data
cv.SetData(img, mem)
# save matrix as an xml file and open it with matrix viewer
cv.Save("/tmp/dump.xml", img, "matrix")
call(["matrix-viewer", "/tmp/dump.xml"])
def get_current_inferior(inferior_repository, inferior_factory):
inferior_num = gdb.selected_inferior().num
if not inferior_repository.has_inferior(inferior_num):
inferior = inferior_factory.create_inferior(inferior_num)
inferior_repository.add_inferior(inferior)
return inferior_repository.get_inferior(inferior_num)
def search(searchfor):
value = searchfor
size = None
i = gdb.selected_inferior()
maps = pwndbg.vmmap.get()
hits = []
for vmmap in maps:
start = vmmap.vaddr
end = start + vmmap.memsz
while True:
# No point in searching if we can't read the memory
if not pwndbg.memory.peek(start):
break
start = i.search_memory(start, end - start, searchfor)
if start is None:
break
# For some reason, search_memory will return a positive hit
# when it's unable to read memory.
if not pwndbg.memory.peek(start):
break
yield start
start += len(searchfor)
def print_ucontext(arg, from_tty):
"""print-context: print a ucontext_t* from a signal handler"""
# Assumes linux/amd64.
ctxt = gdb.parse_and_eval(arg)
size_t = "Q"
stack_t = "Pi" + size_t
stack_fields = ("ss_sp", "ss_flags", "ss_size")
mcontext_t = "qqqqqqqqqqqqqqqqqqhhhhqqqq" + "P" + 8 * "Q"
mcontext_fields = ("R8", "R9", "R10", "R11", "R12", "R13", "R14", "R15",
"RDI", "RSI", "RBP", "RBX", "RDX", "RAX", "RCX",
"RSP", "RIP", "EFLAGS", "CS", "GS", "FS", "__pad0",
"ERR", "TRAPNO", "OLDMASK", "CR2",
"fpregs*") + 8 * ("__reserved1",)
ucontext_t = "LP" + stack_t + mcontext_t # + uc_sigmask + fpregs
ucontext_fields = ("uc_flags", "uc_link") + stack_fields + mcontext_fields
nbytes = struct.calcsize(ucontext_t)
data = gdb.selected_inferior().read_memory(ctxt, nbytes)
fields = struct.unpack(ucontext_t, data)
for field, value in zip(ucontext_fields, fields):
if field.startswith("__"):
continue
print("%-10s %#18x %20d" % (field, value, value))
def _update(self):
# Update name in case it changed
self.name = self.tp.dereference()['p_name'].string()
self.regs = list(reg_cache) # Make a copy of the list
if self.tp == currp:
self.active = True
self._update_frame()
return
self.active = False
r13 = self.tp.dereference()['p_ctx']['r13']
longtype = gdb.lookup_type('unsigned long')
self.regs[13] = int((r13+1).cast(longtype))
self.regs[15] = int(r13['lr'].cast(longtype))
for i in range(4, 12):
self.regs[i] = int(r13['r%d'%i].cast(longtype))
self._update_frame()
# Attempt the nasty unwind out of _port_switch_from_isr
# get function for pc
if str(self.block.function) == "_port_switch_from_isr":
#if here pop exception frame from stack...
ex_struct = "<8L"
stack = gdb.selected_inferior().read_memory(self.regs[13],
struct.calcsize(ex_struct))
stack = struct.unpack(ex_struct, stack)
self.regs[:4] = stack[:4]
self.regs[12] = stack[4]
self.regs[14] = stack[5]
self.regs[15] = stack[6]
self.regs[16] = stack[7]
# TODO check for extended/standard frame
self.regs[13] += 0x68 # size of extended frame
self._update_frame()
def invoke(self, arg, from_tty):
argv = gdb.string_to_argv(arg)
if len(argv) != 2:
raise gdb.GdbError('hex-dump takes exactly 2 arguments.')
addr = gdb.parse_and_eval(argv[0]).cast(
gdb.lookup_type('void').pointer())
try:
bytes = int(gdb.parse_and_eval(argv[1]))
except ValueError:
raise gdb.GdbError('Byte count numst be an integer value.')
inferior = gdb.selected_inferior()
align = gdb.parameter('hex-dump-align')
width = gdb.parameter('hex-dump-width')
if width == 0:
width = 16
mem = inferior.read_memory(addr, bytes)
pr_addr = int(str(addr), 16)
pr_offset = width
if align:
pr_offset = width - (pr_addr % width)
pr_addr -= pr_addr % width
for group in groups_of(mem, width, pr_offset):
print '0x%x: ' % (pr_addr,) + ' '*(width - pr_offset),
print ' '.join(['%02X' % (ord(g),) for g in group]) + \
' ' * (width - len(group) if pr_offset == width else 0) + ' ',
print ' '*(width - pr_offset) + ''.join(
[g if isgraph(g) or g == ' ' else '.' for g in group])
pr_addr += width
pr_offset = width
def saveCurrentState(state):
curr_thread = gdb.selected_thread()
for thread in gdb.selected_inferior().threads():
if not thread.num in state:
thread.switch()
state[thread.num] = HermitTaskState()
curr_thread.switch()
def read(addr, count, partial=False):
result = b''
try:
result = gdb.selected_inferior().read_memory(addr, count)
except gdb.error as e:
if not partial:
raise
if not hasattr(e, 'message'):
e.message=str(e)
stop_addr = int(e.message.split()[-1], 0)
if stop_addr != addr:
return read(addr, stop_addr-addr)
# QEMU will return the start address as the failed
# read address. Try moving back a few pages at a time.
stop_addr = addr + count
# Move the stop address down to the previous page boundary
stop_addr &= PAGE_MASK
while stop_addr > addr:
result = read(addr, stop_addr-addr)
if result:
return result
# Move down by another page
stop_addr -= PAGE_SIZE
# if pwndbg.compat.python3:
# result = bytes(result)
return bytearray(result)
def stop(self):
"""Method called by GDB when the breakpoint is triggered."""
# Read the i-th argument of an x86_64 function call
args = ["$rdi", "$rsi", "$rdx", "$rcx"]
fmt_addr = int(gdb.parse_and_eval(args[self.fmt_idx]))
# Parse /proc/<pid>/maps for this process
proc_map = []
with open("/proc/%d/maps" % gdb.selected_inferior().pid) as fp:
proc_map = self._parse_map(fp.read())
# Find the memory range which contains our format address
for mapping in proc_map:
if mapping["start"] <= fmt_addr < mapping["end"]:
break
else:
print "%016x belongs to an unknown memory range" % fmt_addr
return True
# Check the memory permissions
if "w" in mapping["perms"]:
print "Format string in writable memory!"
return True
return False
def step_bps(self, selector): inf = gdb.selected_inferior() bps = [] for (name, bloc) in self.dbg_map['blocs'].items(): buf = str(inf.read_memory(bloc['addr'], bloc['size']) ) il = Decode(bloc['addr'], buf, Decode32Bits) if len(il) != len(bloc['insns']): raise Exception( "decoded instruction list of different size than instruction map: %d != %d" % ( len(il), len(bloc['insns']) ) ) for i in range(0, len(il)): ins = il[i] if bloc['insns'][i]['dummy']: continue if not selector(bloc['insns'][i]['src_lineno'], bloc['insns'][i]['sir_lineno']): continue bps.append(MultiBP( bps, "*0x%08x" % (ins[0]) )) return bps
def get_fragment_instances():
# Walk the threadlist to find fragment instance ids. Assumes IMPALA-6416, so
# this will not work with releases older than Impala 2.12. It may be possible
# to search for FragmentInstanceState::Exec() in the older releases to get
# to the FInstIDs. Returns a dictionary of FInstID->[gdb thread ID].
# Note that multiple threads might be doing tasks for the same FInstID.
fragment_instances = defaultdict(list)
for thread in gdb.selected_inferior().threads():
thread.switch()
f = gdb.newest_frame()
while f:
# Skip unresolved frame
if gdb.Frame.name(f) is None:
f = gdb.Frame.older(f)
continue
if 'impala::Thread::SuperviseThread' in gdb.Frame.name(f):
gdb.Frame.select(f)
block = gdb.Frame.block(f)
gdb.lookup_symbol('thread_debug_info', block)
tdi = f.read_var('thread_debug_info')
# No valid thread_debug_info
if not tdi:
break
hi = long(tdi['instance_id_']['hi'])
lo = long(tdi['instance_id_']['lo'])
fi = "%lx:%lx" % (hi, lo)
if fi != "0:0":
fragment_instances[fi.strip('"')].append(thread.num)
break
f = gdb.Frame.older(f)
return fragment_instances
def update():
"""
For each running thread, updates the known address range
for its stack.
"""
curr_thread = gdb.selected_thread()
try:
for thread in gdb.selected_inferior().threads():
thread.switch()
sp = pwndbg.regs.sp
# If we don't already know about this thread, create
# a new Page mapping for it.
page = stacks.get(thread.ptid, None)
if page is None:
start = pwndbg.memory.find_lower_boundary(sp)
stop = find_upper_stack_boundary(sp)
page = pwndbg.memory.Page(start, stop-start, 6 if not is_executable() else 7, 0, '[stack]')
stacks[thread.ptid] = page
continue
elif page.objfile is None:
page.objfile = '[stack]'
# If we *DO* already know about this thread, just
# update the lower boundary.
low = pwndbg.memory.find_lower_boundary(page.vaddr)
if low != page.vaddr:
page.memsz += (page.vaddr - low)
page.vaddr = low
finally:
curr_thread.switch()
def invoke(self, arg, from_tty):
args = gdb.string_to_argv(arg)
v = gdb.parse_and_eval(args[0])
cols, rows = int(v['cols']), int(v['rows'])
channel, depth = self.decode_flag(v['flags'])
if depth != CV_8U:
print("support CV_8U only")
return
# conver the v['data'] type to "char*" type
char_type = gdb.lookup_type("char")
char_pointer_type = char_type.pointer()
buffer_ptr = v['data'].cast(char_pointer_type)
# read bytes from inferior's memory, because
# we run the opencv-python module in GDB's own process
# otherwise, we use memory corss processes
buf = v['step']['buf']
bytes_cnt = buf[0] * v['rows']
inferior = gdb.selected_inferior()
mem = inferior.read_memory(buffer_ptr, bytes_cnt)
img = np.frombuffer(mem, dtype='uint8', count=int(bytes_cnt))
img = img.reshape(rows, cols, channel)
# cv2.startWindowThread()
cv2.namedWindow('viewer')
cv2.imshow('viewer', img)
cv2.waitKey(0)
cv2.destroyWindow('viewer')
def stop(self):
args = ["$ebp+8"]
fmt_addr = gdb.parse_and_eval(args[self.fmt_idx])
proc_map = []
with open("/proc/%d/maps" % gdb.selected_inferior().pid) as fp:
proc_map = self._parse_map(fp.read())
for mapping in proc_map:
if mapping["start"] <= fmt_addr < mapping["end"]:
break
else:
print("%08x belongs to an unknown memory range" % fmt_addr)
return True
if "w" in mapping["perms"]:
print("Format string in writable memory!")
#gdb.execute('set logging off')
#gdb.execute('set logging on')
#gdb.execute('set logging overwrite on')
gdb.execute('bt -1')
return True
#gdb.execute('quit')
return False
def all_traces():
constants = TraceConstants()
inf = gdb.selected_inferior()
trace_log = gdb.lookup_global_symbol('trace_log').value()
max_trace = ulong(gdb.parse_and_eval('max_trace'))
trace_log = inf.read_memory(trace_log.address, max_trace)
trace_page_size = ulong(gdb.parse_and_eval('trace_page_size'))
last = ulong(gdb.lookup_global_symbol('trace_record_last').value()['_M_i'])
last %= max_trace
pivot = align_up(last, trace_page_size)
trace_log = trace_log[pivot:] + trace_log[:pivot]
last += max_trace - pivot
backtrace_len = constants.backtrace_len
i = 0
while i < last:
tp_key, thread, time, cpu, flags = struct.unpack('QQQII', trace_log[i:i+32])
if tp_key == 0:
i = align_up(i + 8, trace_page_size)
continue
tp = gdb.Value(tp_key).cast(gdb.lookup_type('tracepoint_base').pointer())
sig = sig_to_string(ulong(tp['sig'])) # FIXME: cache
i += 32
backtrace = None
if flags & 1:
backtrace = struct.unpack('Q' * backtrace_len, trace_log[i:i+8*backtrace_len])
i += 8 * backtrace_len
size = struct.calcsize(sig)
data = struct.unpack(sig, trace_log[i:i+size])
i += size
i = align_up(i, 8)
yield Trace(tp, thread, time, cpu, data, backtrace=backtrace)
def invoke(self, arg="", from_tty=False, sig=SIGINT):
# Iterate over each ChibiOS thread and add a PRSTATUS note descriptor
# for the general-purposes registers.
notes = b""
for t in chibios.thread_cache:
prstatus = corefile.ARM_prstatus()
if t.active: # Only set signal for the running thread
prstatus.pr_cursig = sig
prstatus.pr_pid = t.lwp
# Is it possible to include a target register description?
notes += corefile.note_desc("CORE", 1, prstatus.dumps() + struct.pack("<19L", *t.regs))
inf = gdb.selected_inferior()
# How do we query the memory map from GDB?
# TODO: Use 'info mem'
ram = inf.read_memory(0x20000000, 128 * 1024)
ccmram = inf.read_memory(0x10000000, 64 * 1024)
scs = inf.read_memory(0xE000ED00, 0x40)
core = corefile.CoreFile()
core.set_type(corefile.ET_CORE)
core.set_machine(0x28) # ARM
core.add_program(corefile.PT_NOTE, 0, notes)
core.add_program(corefile.PT_LOAD, 0x10000000, ccmram)
core.add_program(corefile.PT_LOAD, 0x20000000, ram)
core.add_program(corefile.PT_LOAD, 0xE000ED00, scs)
fn = arg if arg else gcore_file_name.value
fn += "-" + time.strftime("%y%m%d-%H%M%S")
core.dump(open(fn, "wb"))
print("(core dumped to %r)" % fn)
def handle_basetype(self, tp_name, p):
basetype_dict = {"type": tp_name}
if tp_name in "bool int long":
obj = gdb.parse_and_eval("*(PyIntObject *)(%s)" % p)
basetype_dict["value"] = str(obj["ob_ival"])
elif tp_name == "float":
obj = gdb.parse_and_eval("*(PyFloatObject *)(%s)" % p)
basetype_dict["value"] = str(obj["ob_fval"])
elif tp_name == "str":
obj = gdb.parse_and_eval("*(PyStringObject *)(%s)" % p)
inferior = gdb.selected_inferior()
ob_size = int(str(obj["ob_size"]))
value = inferior.read_memory(int(str(obj["ob_sval"].address), 16), ob_size)
basetype_dict["value"] = str(value)
basetype_dict["length"] = ob_size
elif tp_name == "bytearray":
obj = gdb.parse_and_eval("*(PyByteArrayObject *)(%s)" % p)
basetype.update({
"value": obj["ob_bytes"].string(),
"ob_alloc": obj["ob_alloc"].string(),
"ob_exports": obj["ob_exports"].string()
})
elif tp_name == "complex":
obj = gdb.parse_and_eval("*(PyComplexObject *)(%s)" % p)
basetype_dict["real"] = str(obj["cval"]["real"])
basetype_dict["image"] = str(obj["cval"]["imag"])
return basetype_dict
def reactor_threads():
orig = gdb.selected_thread()
for t in gdb.selected_inferior().threads():
t.switch()
if has_reactor():
yield t
orig.switch()
def _GetGdbThreadMapping(self, position):
"""Gets a mapping from python tid to gdb thread num.
There's no way to get the thread ident from a gdb thread. We only get the
"ID of the thread, as assigned by GDB", which is completely useless for
everything except talking to gdb. So in order to translate between these
two, we have to execute 'info threads' and parse its output. Note that this
may only work on linux, and only when python was compiled to use pthreads.
It may work elsewhere, but we won't guarantee it.
Args:
position: array of pid, tid, framedepth specifying the requested position.
Returns:
A dictionary of the form {python_tid: gdb_threadnum}.
"""
if len(gdb.selected_inferior().threads()) == 1:
# gdb's output for info threads changes and only displays PID. We cheat.
return {position[1]: 1}
# example:
# 8 Thread 0x7f0a637fe700 (LWP 11894) "test.py" 0x00007f0a69563e63 in
# select () from /usr/lib64/libc.so.6
thread_line_regexp = r'\s*\**\s*([0-9]+)\s+[a-zA-Z]+\s+([x0-9a-fA-F]+)\s.*'
output = gdb.execute('info threads', to_string=True)
matches = [re.match(thread_line_regexp, line) for line
in output.split('\n')[1:]]
return {int(match.group(2), 16): int(match.group(1))
for match in matches if match}
def invoke(self, arg, from_tty):
frame = gdb.selected_frame()
val = frame.read_var(arg)
if str(val.type.strip_typedefs()) == 'SkBitmap':
pixels = val['fPixels']
row_bytes = val['fRowBytes']
info = val['fInfo']
width = info['fWidth']
height = info['fHeight']
color_type = info['fColorType']
alpha_type = info['fAlphaType']
process = gdb.selected_inferior()
memory_data = process.read_memory(pixels, row_bytes * height)
size = (width, height)
image = None
# See Unpack.c for the values understood after the "raw" parameter.
if color_type == ColorType.bgra_8888.value:
if alpha_type == AlphaType.unpremul.value:
image = Image.frombytes("RGBA", size, memory_data.tobytes(),
"raw", "BGRA", row_bytes, 1)
elif alpha_type == AlphaType.premul.value:
# RGBA instead of RGBa, because Image.show() doesn't work with RGBa.
image = Image.frombytes("RGBA", size, memory_data.tobytes(),
"raw", "BGRa", row_bytes, 1)
if image:
# Fails on premultiplied alpha, it cannot convert to RGB.
image.show()
else:
print ("Need to add support for %s %s." % (
str(ColorType(int(color_type))),
str(AlphaType(int(alpha_type)))
))
def parse_proc_maps():
# gdb doesn't have a direct way to tell us if a given address is
# claimed by some shared library or the executable. See
# https://sourceware.org/bugzilla/show_bug.cgi?id=19288
# In the interest of not requiring a patched gdb, instead we read
# /proc/.../maps. This only works locally, but maybe could work
# remotely using "remote get". FIXME.
mapfile = '/proc/' + str(gdb.selected_inferior().pid) + '/maps'
# Note we only examine executable mappings here.
matcher = re.compile("^([a-fA-F0-9]+)-([a-fA-F0-9]+)\s+..x.\s+\S+\s+\S+\s+\S*(.*)$")
mappings = []
with open(mapfile, "r") as inp:
for line in inp:
match = matcher.match(line)
if not match:
# Header lines and such.
continue
start = match.group(1)
end = match.group(2)
name = match.group(3).strip()
if name is '' or (name.startswith('[') and name is not '[vdso]'):
# Skip entries not corresponding to a file.
continue
mappings.append((long(start, 16), long(end, 16)))
return mappings
def hexinput(arg, padding=0):
procs = gdb.selected_inferior()
arg = shell_unhexlify(arg.replace("0x", "").replace("\n", ""),
padding) + "\\x0a"
pid = procs.pid
with open('/dev/stdout') as fd:
tty_path = os.ttyname(fd.fileno())
emit_str = baseIOCTL.format(tty_path, "c") + \
" + " + baseIOCTL.format(tty_path, "\\n")
for i in range(0, len(arg), 4):
emit_str += " + " + baseIOCTL.format(tty_path, arg[i:i + 4])
emit_str = "call (void)(" + emit_str + ")"
SILENT = True
gdb.execute(emit_str)
def handle(self, event):
regs = grabParameterRegs()
pid = gdb.selected_inferior().pid
if self.beginOfCall:
syscall = int(regs[0])
self.currentSyscall = syscall
syscallEnter(syscall, regs, pid)
else:
syscallExit(self.currentSyscall, regs, pid)
self.currentSyscall = -1
self.beginOfCall = not self.beginOfCall
def test_coredump_command_no_target(gdb_base_fixture, capsys,
settings_coredump_allowed):
"""Test coredump command shows error when no target is connected"""
import gdb
from memfault_gdb import MemfaultCoredump
inferior = gdb.selected_inferior()
inferior.threads.return_value = []
cmd = MemfaultCoredump()
cmd.invoke("--project-key {}".format(TEST_PROJECT_KEY), True)
stdout = capsys.readouterr().out
assert "No target" in stdout
def __init__(self):
self.inferior = gdb.selected_inferior()
self.pid = 0
self.base_addr = None
self.efl_map = {}
self.efl_map['CF'] = 1 << 0
self.efl_map['PF'] = 1 << 2
self.efl_map['AF'] = 1 << 4
self.efl_map['ZF'] = 1 << 6
self.efl_map['SF'] = 1 << 7
self.efl_map['TF'] = 1 << 8
self.efl_map['IF'] = 1 << 9
self.efl_map['DF'] = 1 << 10
self.efl_map['OF'] = 1 << 11
def invoke(self, arg, unused_from_tty):
addr = gdb.parse_and_eval(arg)
pid = int(gdb.selected_inferior().pid)
map_name = "/proc/%d/maps" % pid
with open(map_name, 'r') as map:
for line in map:
line = line.rstrip()
if not line: continue
match = re.match(r'^(\w+)-(\w+)', line)
if match:
start = int(match.group(1), 16)
end = int(match.group(2), 16)
if addr >= start and addr < end:
print(line)
def fake_fast(addr, size):
get_heap_info()
result = []
idx = fastbin_idx(size)
chunk_size = size & 0xfffffffffffffff8
start = addr - chunk_size
chunk_data = gdb.selected_inferior().read_memory(start, chunk_size)
for offset in range(chunk_size - 4):
fake_size = u32(chunk_data[offset:offset + 4])
if fastbin_idx(fake_size) == idx:
if ((fake_size & 2 == 2) and (fake_size & 4 == 4)) or (fake_size & 4 == 0):
padding = addr - (start + offset - capsize) - capsize * 2
result.append((start + offset - capsize, padding))
return result
def read(addr, count, partial=False):
"""read(addr, count, partial=False) -> bytearray
Read memory from the program being debugged.
Arguments:
addr(int): Address to read
count(int): Number of bytes to read
partial(bool): Whether less than ``count`` bytes can be returned
Returns:
:class:`bytearray`: The memory at the specified address,
or ``None``.
"""
result = b''
count = max(int(count), 0)
try:
result = gdb.selected_inferior().read_memory(addr, count)
except gdb.error as e:
if not partial:
raise
if not hasattr(e, 'message'):
e.message=str(e)
stop_addr = int(e.message.split()[-1], 0)
if stop_addr != addr:
return read(addr, stop_addr-addr)
# QEMU will return the start address as the failed
# read address. Try moving back a few pages at a time.
stop_addr = addr + count
# Move the stop address down to the previous page boundary
stop_addr &= PAGE_MASK
while stop_addr > addr:
result = read(addr, stop_addr-addr)
if result:
return result
# Move down by another page
stop_addr -= PAGE_SIZE
# if pwndbg.compat.python3:
# result = bytes(result)
return bytearray(result)
def javascript_stack():
"""GDB in-process python supplement."""
for thread in gdb.selected_inferior().threads():
try:
if not thread.is_valid():
print("Ignoring invalid thread %d in javascript_stack" %
thread.num)
continue
thread.switch()
# Switch frames so gdb actually knows about the mongo::mozjs namespace. It doesn't
# actually matter which frame so long as it isn't the top of the stack. This also
# enables gdb to know about the mongo::mozjs::kCurrentScope thread-local variable
# when using gdb.parse_and_eval().
gdb.selected_frame().older().select()
except gdb.error as err:
print("Ignoring GDB error '%s' in javascript_stack" % str(err))
continue
try:
# The following block is roughly equivalent to this:
# namespace mongo::mozjs {
# std::atomic<MozJSImplScope*> kCurrentScope = ...;
# }
# if (!scope || scope->_inOp == 0) { continue; }
# print(scope->buildStackString()->c_str());
atomic_scope = gdb.parse_and_eval(
"mongo::mozjs::kCurrentScope")
ptr = MongoDBJavaScriptStack.atomic_get_ptr(atomic_scope)
if not ptr:
continue
scope = ptr.dereference()
if scope['_inOp'] == 0:
continue
gdb.execute('thread', from_tty=False, to_string=False)
# gdb continues to not support calling methods through Python,
# so work around it by casting the raw ptr back to its type,
# and calling the method through execute darkness
gdb.execute(
f'printf "%s\\n", ((mongo::mozjs::MozJSImplScope*)({ptr}))->buildStackString().c_str()',
from_tty=False,
to_string=False)
except gdb.error as err:
print("Ignoring GDB error '%s' in javascript_stack" % str(err))
continue
def invoke(self, arg, from_tty):
args = gdb.string_to_argv(arg)
var_name = str(args[0])
picked_obj = gdb.parse_and_eval(args[0])
buffer, width, height, channels, type, step = gdbiwtype.get_buffer_info(
picked_obj)
bytes = get_buffer_size(width, height, channels, type, step)
inferior = gdb.selected_inferior()
mem = inferior.read_memory(buffer, bytes)
lib.plot_binary(mem, var_name, width, height, channels, type, step)
pass
def sigrt_handler(self):
inf = gdb.selected_inferior()
self.notifier.cond.acquire()
if inf.pid != 0:
res = self.edit(self.modifications)
if res:
# Empty the modifications
while len(self.modifications) > 0:
f = self.modifications.pop()
self.notifier.cond.notify()
self.notifier.cond.release()
return res
def patch_addr(self, addr, code):
inf = gdb.selected_inferior()
if inf.pid == 0:
print("Target is not running, there is no memory")
return
context = self.context
if context == None:
context = get_current_arch()
cmd = ['pwn', 'asm', '-f', 'raw', '-c', context, code]
opcodes = subprocess.check_output(cmd)
inf.write_memory(addr, opcodes)
def shape_object(addr):
inferior = gdb.selected_inferior()
# Reeading Shape
shape_contents = inferior.read_memory(addr, 0x20)
shape = {}
shape['base_'] = u64(memview_substr(shape_contents, 0, 8))
shape['propid_'] = u64(memview_substr(shape_contents, 8, 16))
shape['slotInfo'] = u32(memview_substr(shape_contents, 16, 20))
shape['attr'] = u8(memview_substr(shape_contents, 20, 21))
shape['flags'] = u8(memview_substr(shape_contents, 21, 22))
shape['parent'] = u64(memview_substr(shape_contents, 24, 32))
return shape
def stop(self, bp):
fr = gdb.selected_frame()
block = fr.block()
while block.function is None:
block = block.superblock
file, ptr, len_ = (arg.value(fr) for arg in block if arg.is_argument)
try:
buf = gdb.selected_inferior().read_memory(ptr, len_)
gdb.execute("set var res = {}".format(self.os_.write(file, buf.tobytes())))
gdb.execute("set var err = 0")
except OSError as e:
gdb.execute("set var err = {}".format(map_errno(int(str(e)), errno, Flags)))
def is_inferior_running():
inf = gdb.selected_inferior()
"""
if m_debug.Debug:
m_debug.dbg_print("inf.is_valid()=", inf.is_valid())
m_debug.dbg_print("inf.num=", inf.num)
m_debug.dbg_print("inf.pid=", inf.pid)
m_debug.dbg_print("inf.was_attached=", inf.was_attached)
m_debug.dbg_print("inf.threads()=", inf.threads(), "len(theads()=", len(inf.threads()))
"""
if inf.pid != 0 and len(inf.threads()) > 0:
return True
else:
return False
def read_dwords(addr, size):
proc = gdb.selected_inferior()
dword_size = get_dword_size()
ndwords = size * dword_size
bytearr = read_bytes(addr, ndwords)
dwords = []
for i in range(0, ndwords, dword_size):
dword = bytearr[i]
for j in range(1, dword_size):
dword += bytearr[i + j] << j * 8
dwords.append(dword)
return dwords
def invoke(self, arg, from_tty):
argv = gdb.string_to_argv(arg)
addr = gdb.parse_and_eval(argv[0]).cast(
gdb.lookup_type('void').pointer())
if len(argv) == 2:
try:
bytes = int(gdb.parse_and_eval(argv[1]))
except ValueError:
raise gdb.GdbError('Byte count numst be an integer value.')
else:
bytes = 512
inferior = gdb.selected_inferior()
align = gdb.parameter('hex-dump-align')
width = gdb.parameter('hex-dump-width')
if width == 0:
width = 16
mem = inferior.read_memory(addr, bytes)
pr_addr = int(str(addr), 16)
pr_offset = width
if align:
pr_offset = width - (pr_addr % width)
pr_addr -= pr_addr % width
start = (pr_addr) & 0xff
print(' ', end="")
print(' '.join(
['%01X' % (i & 0x0f, ) for i in range(start, start + width)]),
end="")
print(' ', end="")
print(''.join(
['%01X' % (i & 0x0f, ) for i in range(start, start + width)]))
for group in groups_of(mem, width, pr_offset):
print('0x%x: ' % (pr_addr, ) + ' ' * (width - pr_offset), end="")
print (' '.join(['%02X' % (ord(g),) for g in group]) + \
' ' * (width - len(group) if pr_offset == width else 0) + ' ', end="")
print(' ' * (width - pr_offset) + ''.join([
chr(int.from_bytes(g, byteorder='big')) if isgraph(
int.from_bytes(g, byteorder='big')) or g == ' ' else '.'
for g in group
]))
pr_addr += width
pr_offset = width
def find_goroutine(goid):
"""
find_goroutine attempts to find the goroutine identified by goid.
It returns a tuple of gdb.Value's representing the stack pointer
and program counter pointer for the goroutine.
@param int goid
@return tuple (gdb.Value, gdb.Value)
"""
vp = gdb.lookup_type('void').pointer()
for ptr in SliceValue(gdb.parse_and_eval("'runtime.allgs'")):
if ptr['atomicstatus'] == G_DEAD:
continue
if ptr['goid'] == goid:
break
else:
return None, None
# Get the goroutine's saved state.
pc, sp = ptr['sched']['pc'], ptr['sched']['sp']
status = ptr['atomicstatus'] & ~G_SCAN
# Goroutine is not running nor in syscall, so use the info in goroutine
if status != G_RUNNING and status != G_SYSCALL:
return pc.cast(vp), sp.cast(vp)
# If the goroutine is in a syscall, use syscallpc/sp.
pc, sp = ptr['syscallpc'], ptr['syscallsp']
if sp != 0:
return pc.cast(vp), sp.cast(vp)
# Otherwise, the goroutine is running, so it doesn't have
# saved scheduler state. Find G's OS thread.
m = ptr['m']
if m == 0:
return None, None
for thr in gdb.selected_inferior().threads():
if thr.ptid[1] == m['procid']:
break
else:
return None, None
# Get scheduler state from the G's OS thread state.
curthr = gdb.selected_thread()
try:
thr.switch()
pc = gdb.parse_and_eval('$pc')
sp = gdb.parse_and_eval('$sp')
finally:
curthr.switch()
return pc.cast(vp), sp.cast(vp)
def nice_str(v, length=None):
if v == 0:
return "NULL"
else:
inferior = gdb.selected_inferior()
try:
readable = inferior.read_memory(v, 1)
except gdb.MemoryError:
return "(invalid)"
try:
if length is not None:
return '"%s"' % v.string(length=length)
else:
return '"%s"' % v.string()
except UnicodeDecodeError:
return "(garbage)"
def _state(self):
"""
Get the state of a given target. Internal use.
"""
target = gdb.selected_inferior()
if target.is_valid():
try:
output = gdb.execute('info program', to_string=True)
if "not being run" in output:
state = "invalid"
elif "stopped" in output:
state = "stopped"
except gdb.error, e:
if 'Selected thread is running.' == str(e):
state = "running"
def invoke(self, arg, _):
argv = gdb.string_to_argv(arg)
(exe, test_input, result_path) = argv
gdb.execute("file {}".format(exe))
gdb.Breakpoint("exit")
gdb.execute("r {} 2>&1 >/dev/null".format(test_input))
tables = get_tables()
for (module, (addr, length)) in tables.items():
mem = gdb.selected_inferior().read_memory(addr, length)
with open(os.path.join(result_path, module + ".cov"),
"wb") as handle:
handle.write(mem)
def select_thread(self, global_num):
if self.selected_global_num == global_num:
return
for thread in gdb.selected_inferior().threads():
if thread.global_num == global_num:
thread.switch()
pkgs = [
self.pkg_unselect_thread(self.selected_global_num),
self.pkg_select_thread(global_num),
]
self.selected_global_num = global_num
return self.pkg_transaction(pkgs)
self.send_error("can't find selected thread")
#It seems that in gui window show old thread data, because user select unexisted thread.
#Update this.
return self.need_update()
def stop(self):
gdb.execute('set logging overwrite on')
gdb.execute('set logging on')
for i in range(0, 10):
gdb.execute('x/s *((char **)environ+%d)' % i)
gdb.execute('set logging off')
gdb.execute('set logging overwrite off')
gdb.execute('set logging on')
gdb.execute('set logging off')
proc_map = []
with open("/proc/%d/maps" % gdb.selected_inferior().pid) as fp:
f = open('procMap.txt', 'w')
f.write(fp.read())
def _GetTag(self):
"""Helper for .children() and .to_string().
We don't know the order in which they'll be called.
"""
if self.asdl_tag is None:
# Get address of value and look at first 16 bits
obj = self.val.dereference() # location of part_value_t
# Read the uint16_t tag
tag_mem = gdb.selected_inferior().read_memory(obj.address, 2)
# Unpack 2 bytes into an integer
(self.asdl_tag,) = struct.unpack('H', tag_mem)
return self.asdl_tag
def __init__(self):
self.inferior = gdb.selected_inferior()
# Pagination is not helpful here
gdb.execute("set pagination off")
# Connect to our target
gdb.execute("att 1")
# Load everything into gdb and run
gdb.execute("load")
gdb.execute("b main")
gdb.execute("run")
# Stopped at the top of main. Go to tc_main via tc_prelude
gdb.execute("del 1")
gdb.execute("b tc_main")
gdb.execute("set $pc=tc_prelude")
gdb.execute("c")
def get_thread_list_str():
start_pos = 0
thread_desc = ""
conn = gdb.selected_inferior().connection
if not isinstance(conn, gdb.RemoteTargetConnection):
raise gdb.GdbError("connection is the wrong type")
while True:
str = conn.send_packet("qXfer:threads:read::%d,200" %
start_pos).decode("ascii")
start_pos += 200
c = str[0]
str = str[1:]
thread_desc += str
if c == "l":
break
return thread_desc
def invoke(self, arg, _from_tty):
stacks = {}
if not arg:
arg = 'bt' # default to 'bt'
current_thread = gdb.selected_thread()
try:
for thread in gdb.selected_inferior().threads():
if not thread.is_valid():
continue
thread.switch()
self._process_thread_stack(arg, stacks, thread)
self._dump_unique_stacks(stacks)
finally:
if current_thread and current_thread.is_valid():
current_thread.switch()
def invoke(self, arg, from_tty):
# print('Invoke %s %s' %(arg, from_tty))
argv = gdb.string_to_argv(arg)
if len(argv) != 2:
raise gdb.GdbError('hex-dump takes exactly 2 arguments.')
addr = gdb.parse_and_eval(argv[0]).cast(
gdb.lookup_type('void').pointer())
try:
bytes = int(gdb.parse_and_eval(argv[1]))
except ValueError:
raise gdb.GdbError('Byte count numst be an integer value.')
inferior = gdb.selected_inferior()
align = False # gdb.parameter('hex-dump-align')
width = 16 # gdb.parameter('hex-dump-width')
if width == 0:
width = 16
mem = inferior.read_memory(addr, bytes)
pr_addr = int(str(addr), 16)
pr_offset = width
if align:
pr_offset = width - (pr_addr % width)
pr_addr -= pr_addr % width
for group in groups_of(mem, width, pr_offset):
print '0x%x: ' % (pr_addr, ) + ' ' * (width - pr_offset),
x = 0
if pr_offset == width:
x = width - len(group)
print ' '.join(['%02X' % (ord(g),) for g in group]) + \
' ' * x + ' ',
# ' ' * (width - len(group) if pr_offset == width else 0) + ' ',
for g in group:
if isgraph(g) or g == ' ':
l.apppend(g)
else:
l.append('.')
print ' ' * (width - pr_offset) + ''.join(l)
# [g if isgraph(g) or g == ' ' else '.' for g in group])
pr_addr += width
pr_offset = width
def search(searchfor,
mapping=None,
start=None,
end=None,
executable=False,
writable=False):
value = searchfor
size = None
i = gdb.selected_inferior()
maps = pwndbg.vmmap.get()
hits = []
if end and start:
maps = [m for m in maps if start <= m < end]
if executable:
maps = [m for m in maps if m.execute]
if writable:
maps = [m for m in maps if m.write]
for vmmap in maps:
start = vmmap.vaddr
end = start + vmmap.memsz
if mapping and mapping not in vmmap.objfile:
continue
while True:
# No point in searching if we can't read the memory
if not pwndbg.memory.peek(start):
break
start = i.search_memory(start, end - start, searchfor)
if start is None:
break
# For some reason, search_memory will return a positive hit
# when it's unable to read memory.
if not pwndbg.memory.peek(start):
break
yield start
start += len(searchfor)
def update():
"""
For each running thread, updates the known address range
for its stack.
"""
curr_thread = gdb.selected_thread()
try:
for thread in gdb.selected_inferior().threads():
thread.switch()
sp = pwndbg.regs.sp
# Skip if sp is None or 0
# (it might be 0 if we debug a qemu kernel)
if not sp:
continue
sp_low = sp & ~(0xFFF)
sp_low -= 0x1000
# If we don't already know about this thread, create
# a new Page mapping for it.
page = stacks.get(thread.ptid, None)
if page is None:
start = sp_low
stop = find_upper_stack_boundary(sp)
page = pwndbg.memory.Page(start, stop - start,
6 if not is_executable() else 7, 0,
"[stack]")
stacks[thread.ptid] = page
continue
elif page.objfile is None:
pid, tid, _ = thread.ptid
if pid == tid:
page.objfile = "[stack]"
else:
page.objfile = "[stack:%i]" % tid
# If we *DO* already know about this thread, just
# update the lower boundary if it got any lower.
low = min(page.vaddr, sp_low)
if low != page.vaddr:
page.memsz += page.vaddr - low
page.vaddr = low
finally:
if curr_thread:
curr_thread.switch()
def __init__(self, addr, pc=None, inferior=None):
self.addr = addr
self.pc = pc
self.inferior = inferior
if inferior is None:
self.inferior = gdb.selected_inferior()
items = [None] * self.ITEMS_SIZE
for frame_item in self.items_info:
items[frame_item.id_number] = self.read_item(frame_item)
self.items = items
self.is_valid_frame = self.validate()
self.is_valid_js_frame = self.is_valid_frame and self.js_validate()
if self.is_valid_js_frame:
self.codeBlock = CodeBlock(self.items[self.CODEBLOCK])
