def invoke(self, arg, from_tty):
log_buf_addr = int(
str(gdb.parse_and_eval("(void *)'printk.c'::log_buf")).split()[0],
16)
log_first_idx = int(gdb.parse_and_eval("'printk.c'::log_first_idx"))
log_next_idx = int(gdb.parse_and_eval("'printk.c'::log_next_idx"))
log_buf_len = int(gdb.parse_and_eval("'printk.c'::log_buf_len"))
inf = gdb.inferiors()[0]
start = log_buf_addr + log_first_idx
if log_first_idx < log_next_idx:
log_buf_2nd_half = -1
length = log_next_idx - log_first_idx
log_buf = utils.read_memoryview(inf, start, length).tobytes()
else:
log_buf_2nd_half = log_buf_len - log_first_idx
a = utils.read_memoryview(inf, start, log_buf_2nd_half)
b = utils.read_memoryview(inf, log_buf_addr, log_next_idx)
log_buf = a.tobytes() + b.tobytes()
length_offset = printk_log_type.get_type()['len'].bitpos // 8
text_len_offset = printk_log_type.get_type()['text_len'].bitpos // 8
time_stamp_offset = printk_log_type.get_type()['ts_nsec'].bitpos // 8
text_offset = printk_log_type.get_type().sizeof
pos = 0
while pos < log_buf.__len__():
length = utils.read_u16(log_buf, pos + length_offset)
if length == 0:
if log_buf_2nd_half == -1:
gdb.write("Corrupted log buffer!\n")
break
pos = log_buf_2nd_half
continue
text_len = utils.read_u16(log_buf, pos + text_len_offset)
text_start = pos + text_offset
text = log_buf[text_start:text_start + text_len].decode(
encoding='utf8', errors='replace')
time_stamp = utils.read_u64(log_buf, pos + time_stamp_offset)
for line in text.splitlines():
msg = u"[{time:12.6f}] {line}\n".format(time=time_stamp /
1000000000.0,
line=line)
# With python2 gdb.write will attempt to convert unicode to
# ascii and might fail so pass an utf8-encoded str instead.
if sys.hexversion < 0x03000000:
msg = msg.encode(encoding='utf8', errors='replace')
gdb.write(msg)
pos += length
def invoke(self, arg, from_tty):
log_buf_addr = int(str(gdb.parse_and_eval(
"(void *)'printk.c'::log_buf")).split()[0], 16)
log_first_idx = int(gdb.parse_and_eval("'printk.c'::log_first_idx"))
log_next_idx = int(gdb.parse_and_eval("'printk.c'::log_next_idx"))
log_buf_len = int(gdb.parse_and_eval("'printk.c'::log_buf_len"))
inf = gdb.inferiors()[0]
start = log_buf_addr + log_first_idx
if log_first_idx < log_next_idx:
log_buf_2nd_half = -1
length = log_next_idx - log_first_idx
log_buf = utils.read_memoryview(inf, start, length).tobytes()
else:
log_buf_2nd_half = log_buf_len - log_first_idx
a = utils.read_memoryview(inf, start, log_buf_2nd_half)
b = utils.read_memoryview(inf, log_buf_addr, log_next_idx)
log_buf = a.tobytes() + b.tobytes()
pos = 0
while pos < log_buf.__len__():
length = utils.read_u16(log_buf[pos + 8:pos + 10])
if length == 0:
if log_buf_2nd_half == -1:
gdb.write("Corrupted log buffer!\n")
break
pos = log_buf_2nd_half
continue
text_len = utils.read_u16(log_buf[pos + 10:pos + 12])
text = log_buf[pos + 16:pos + 16 + text_len].decode(
encoding='utf8', errors='replace')
time_stamp = utils.read_u64(log_buf[pos:pos + 8])
for line in text.splitlines():
msg = u"[{time:12.6f}] {line}\n".format(
time=time_stamp / 1000000000.0,
line=line)
# With python2 gdb.write will attempt to convert unicode to
# ascii and might fail so pass an utf8-encoded str instead.
if sys.hexversion < 0x03000000:
msg = msg.encode(encoding='utf8', errors='replace')
gdb.write(msg)
pos += length
def invoke(self, arg, from_tty):
log_buf_addr = int(str(gdb.parse_and_eval(
"'printk.c'::log_buf")).split()[0], 16)
log_first_idx = int(gdb.parse_and_eval("'printk.c'::log_first_idx"))
log_next_idx = int(gdb.parse_and_eval("'printk.c'::log_next_idx"))
log_buf_len = int(gdb.parse_and_eval("'printk.c'::log_buf_len"))
inf = gdb.inferiors()[0]
start = log_buf_addr + log_first_idx
if log_first_idx < log_next_idx:
log_buf_2nd_half = -1
length = log_next_idx - log_first_idx
log_buf = utils.read_memoryview(inf, start, length).tobytes()
else:
log_buf_2nd_half = log_buf_len - log_first_idx
a = utils.read_memoryview(inf, start, log_buf_2nd_half)
b = utils.read_memoryview(inf, log_buf_addr, log_next_idx)
log_buf = a.tobytes() + b.tobytes()
pos = 0
while pos < log_buf.__len__():
length = utils.read_u16(log_buf[pos + 8:pos + 10])
if length == 0:
if log_buf_2nd_half == -1:
gdb.write("Corrupted log buffer!\n")
break
pos = log_buf_2nd_half
continue
text_len = utils.read_u16(log_buf[pos + 10:pos + 12])
text = log_buf[pos + 16:pos + 16 + text_len].decode()
time_stamp = utils.read_u64(log_buf[pos:pos + 8])
for line in text.splitlines():
gdb.write("[{time:12.6f}] {line}\n".format(
time=time_stamp / 1000000000.0,
line=line))
pos += length
def invoke(self, arg, from_tty):
log_buf_addr = int(
str(gdb.parse_and_eval("'printk.c'::log_buf")).split()[0], 16)
log_first_idx = int(gdb.parse_and_eval("'printk.c'::log_first_idx"))
log_next_idx = int(gdb.parse_and_eval("'printk.c'::log_next_idx"))
log_buf_len = int(gdb.parse_and_eval("'printk.c'::log_buf_len"))
inf = gdb.inferiors()[0]
start = log_buf_addr + log_first_idx
if log_first_idx < log_next_idx:
log_buf_2nd_half = -1
length = log_next_idx - log_first_idx
log_buf = utils.read_memoryview(inf, start, length).tobytes()
else:
log_buf_2nd_half = log_buf_len - log_first_idx
a = utils.read_memoryview(inf, start, log_buf_2nd_half)
b = utils.read_memoryview(inf, log_buf_addr, log_next_idx)
log_buf = a.tobytes() + b.tobytes()
pos = 0
while pos < log_buf.__len__():
length = utils.read_u16(log_buf[pos + 8:pos + 10])
if length == 0:
if log_buf_2nd_half == -1:
gdb.write("Corrupted log buffer!\n")
break
pos = log_buf_2nd_half
continue
text_len = utils.read_u16(log_buf[pos + 10:pos + 12])
text = log_buf[pos + 16:pos + 16 + text_len].decode()
time_stamp = utils.read_u64(log_buf[pos:pos + 8])
for line in text.splitlines():
gdb.write("[{time:12.6f}] {line}\n".format(time=time_stamp /
1000000000.0,
line=line))
pos += length
def invoke(self, arg, from_tty):
inf = gdb.inferiors()[0]
# read in prb structure
prb_addr = int(
str(gdb.parse_and_eval("(void *)'printk.c'::prb")).split()[0], 16)
sz = printk_ringbuffer_type.get_type().sizeof
prb = utils.read_memoryview(inf, prb_addr, sz).tobytes()
# read in descriptor ring structure
off = printk_ringbuffer_type.get_type()['desc_ring'].bitpos // 8
addr = prb_addr + off
sz = prb_desc_ring_type.get_type().sizeof
desc_ring = utils.read_memoryview(inf, addr, sz).tobytes()
# read in descriptor array
off = prb_desc_ring_type.get_type()['count_bits'].bitpos // 8
desc_ring_count = 1 << utils.read_u32(desc_ring, off)
desc_sz = prb_desc_type.get_type().sizeof
off = prb_desc_ring_type.get_type()['descs'].bitpos // 8
addr = utils.read_ulong(desc_ring, off)
descs = utils.read_memoryview(inf, addr,
desc_sz * desc_ring_count).tobytes()
# read in text data ring structure
off = printk_ringbuffer_type.get_type()['text_data_ring'].bitpos // 8
addr = prb_addr + off
sz = prb_data_ring_type.get_type().sizeof
text_data_ring = utils.read_memoryview(inf, addr, sz).tobytes()
# read in text data
off = prb_data_ring_type.get_type()['size_bits'].bitpos // 8
text_data_sz = 1 << utils.read_u32(text_data_ring, off)
off = prb_data_ring_type.get_type()['data'].bitpos // 8
addr = utils.read_ulong(text_data_ring, off)
text_data = utils.read_memoryview(inf, addr, text_data_sz).tobytes()
counter_off = atomic_long_type.get_type()['counter'].bitpos // 8
sv_off = prb_desc_type.get_type()['state_var'].bitpos // 8
off = prb_desc_type.get_type()['text_blk_lpos'].bitpos // 8
begin_off = off + (prb_data_blk_lpos_type.get_type()['begin'].bitpos //
8)
next_off = off + (prb_data_blk_lpos_type.get_type()['next'].bitpos //
8)
off = prb_desc_type.get_type()['info'].bitpos // 8
ts_off = off + printk_info_type.get_type()['ts_nsec'].bitpos // 8
len_off = off + printk_info_type.get_type()['text_len'].bitpos // 8
# definitions from kernel/printk/printk_ringbuffer.h
desc_sv_bits = utils.get_long_type().sizeof * 8
desc_committed_mask = 1 << (desc_sv_bits - 1)
desc_reuse_mask = 1 << (desc_sv_bits - 2)
desc_flags_mask = desc_committed_mask | desc_reuse_mask
desc_id_mask = ~desc_flags_mask
# read in tail and head descriptor ids
off = prb_desc_ring_type.get_type()['tail_id'].bitpos // 8
tail_id = utils.read_u64(desc_ring, off + counter_off)
off = prb_desc_ring_type.get_type()['head_id'].bitpos // 8
head_id = utils.read_u64(desc_ring, off + counter_off)
did = tail_id
while True:
ind = did % desc_ring_count
desc_off = desc_sz * ind
# skip non-committed record
state = utils.read_u64(
descs, desc_off + sv_off + counter_off) & desc_flags_mask
if state != desc_committed_mask:
if did == head_id:
break
did = (did + 1) & desc_id_mask
continue
begin = utils.read_ulong(descs,
desc_off + begin_off) % text_data_sz
end = utils.read_ulong(descs, desc_off + next_off) % text_data_sz
# handle data-less record
if begin & 1 == 1:
text = ""
else:
# handle wrapping data block
if begin > end:
begin = 0
# skip over descriptor id
text_start = begin + utils.get_long_type().sizeof
text_len = utils.read_u16(descs, desc_off + len_off)
# handle truncated message
if end - text_start < text_len:
text_len = end - text_start
text = text_data[text_start:text_start + text_len].decode(
encoding='utf8', errors='replace')
time_stamp = utils.read_u64(descs, desc_off + ts_off)
for line in text.splitlines():
msg = u"[{time:12.6f}] {line}\n".format(time=time_stamp /
1000000000.0,
line=line)
# With python2 gdb.write will attempt to convert unicode to
# ascii and might fail so pass an utf8-encoded str instead.
if sys.hexversion < 0x03000000:
msg = msg.encode(encoding='utf8', errors='replace')
gdb.write(msg)
if did == head_id:
break
did = (did + 1) & desc_id_mask