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Diffstat (limited to 'scripts/gdb/linux/dmesg.py')
-rw-r--r--scripts/gdb/linux/dmesg.py35
1 files changed, 18 insertions, 17 deletions
diff --git a/scripts/gdb/linux/dmesg.py b/scripts/gdb/linux/dmesg.py
index a92c55bd8de5..d5983cf3db7d 100644
--- a/scripts/gdb/linux/dmesg.py
+++ b/scripts/gdb/linux/dmesg.py
@@ -44,19 +44,17 @@ class LxDmesg(gdb.Command):
sz = prb_desc_ring_type.get_type().sizeof
desc_ring = utils.read_memoryview(inf, addr, sz).tobytes()
- # read in descriptor array
+ # read in descriptor count, size, and address
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()
+ desc_addr = utils.read_ulong(desc_ring, off)
- # read in info array
+ # read in info size and address
info_sz = printk_info_type.get_type().sizeof
off = prb_desc_ring_type.get_type()['infos'].bitpos // 8
- addr = utils.read_ulong(desc_ring, off)
- infos = utils.read_memoryview(inf, addr, info_sz * desc_ring_count).tobytes()
+ info_addr = utils.read_ulong(desc_ring, off)
# read in text data ring structure
off = printk_ringbuffer_type.get_type()['text_data_ring'].bitpos // 8
@@ -64,12 +62,11 @@ class LxDmesg(gdb.Command):
sz = prb_data_ring_type.get_type().sizeof
text_data_ring = utils.read_memoryview(inf, addr, sz).tobytes()
- # read in text data
+ # read in text data size and address
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()
+ text_data_addr = utils.read_ulong(text_data_ring, off)
counter_off = atomic_long_type.get_type()['counter'].bitpos // 8
@@ -102,17 +99,20 @@ class LxDmesg(gdb.Command):
desc_off = desc_sz * ind
info_off = info_sz * ind
+ desc = utils.read_memoryview(inf, desc_addr + desc_off, desc_sz).tobytes()
+
# skip non-committed record
- state = 3 & (utils.read_u64(descs, desc_off + sv_off +
- counter_off) >> desc_flags_shift)
+ state = 3 & (utils.read_u64(desc, sv_off + counter_off) >> desc_flags_shift)
if state != desc_committed and state != desc_finalized:
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
+ begin = utils.read_ulong(desc, begin_off) % text_data_sz
+ end = utils.read_ulong(desc, next_off) % text_data_sz
+
+ info = utils.read_memoryview(inf, info_addr + info_off, info_sz).tobytes()
# handle data-less record
if begin & 1 == 1:
@@ -125,16 +125,17 @@ class LxDmesg(gdb.Command):
# skip over descriptor id
text_start = begin + utils.get_long_type().sizeof
- text_len = utils.read_u16(infos, info_off + len_off)
+ text_len = utils.read_u16(info, 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')
+ text_data = utils.read_memoryview(inf, text_data_addr + text_start,
+ text_len).tobytes()
+ text = text_data[0:text_len].decode(encoding='utf8', errors='replace')
- time_stamp = utils.read_u64(infos, info_off + ts_off)
+ time_stamp = utils.read_u64(info, ts_off)
for line in text.splitlines():
msg = u"[{time:12.6f}] {line}\n".format(