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Linux/scripts/gdb/linux/dmesg.py

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Diff markup

Differences between /scripts/gdb/linux/dmesg.py (Version linux-6.12-rc7) and /scripts/gdb/linux/dmesg.py (Version linux-5.11.22)


  1 #                                                   1 #
  2 # gdb helper commands and functions for Linux       2 # gdb helper commands and functions for Linux kernel debugging
  3 #                                                   3 #
  4 #  kernel log buffer dump                           4 #  kernel log buffer dump
  5 #                                                   5 #
  6 # Copyright (c) Siemens AG, 2011, 2012              6 # Copyright (c) Siemens AG, 2011, 2012
  7 #                                                   7 #
  8 # Authors:                                          8 # Authors:
  9 #  Jan Kiszka <jan.kiszka@siemens.com>               9 #  Jan Kiszka <jan.kiszka@siemens.com>
 10 #                                                  10 #
 11 # This work is licensed under the terms of the     11 # This work is licensed under the terms of the GNU GPL version 2.
 12 #                                                  12 #
 13                                                    13 
 14 import gdb                                         14 import gdb
 15 import sys                                         15 import sys
 16                                                    16 
 17 from linux import utils                            17 from linux import utils
 18                                                    18 
 19 printk_info_type = utils.CachedType("struct pr     19 printk_info_type = utils.CachedType("struct printk_info")
 20 prb_data_blk_lpos_type = utils.CachedType("str     20 prb_data_blk_lpos_type = utils.CachedType("struct prb_data_blk_lpos")
 21 prb_desc_type = utils.CachedType("struct prb_d     21 prb_desc_type = utils.CachedType("struct prb_desc")
 22 prb_desc_ring_type = utils.CachedType("struct      22 prb_desc_ring_type = utils.CachedType("struct prb_desc_ring")
 23 prb_data_ring_type = utils.CachedType("struct      23 prb_data_ring_type = utils.CachedType("struct prb_data_ring")
 24 printk_ringbuffer_type = utils.CachedType("str     24 printk_ringbuffer_type = utils.CachedType("struct printk_ringbuffer")
                                                   >>  25 atomic_long_type = utils.CachedType("atomic_long_t")
 25                                                    26 
 26 class LxDmesg(gdb.Command):                        27 class LxDmesg(gdb.Command):
 27     """Print Linux kernel log buffer."""           28     """Print Linux kernel log buffer."""
 28                                                    29 
 29     def __init__(self):                            30     def __init__(self):
 30         super(LxDmesg, self).__init__("lx-dmes     31         super(LxDmesg, self).__init__("lx-dmesg", gdb.COMMAND_DATA)
 31                                                    32 
 32     def invoke(self, arg, from_tty):               33     def invoke(self, arg, from_tty):
 33         inf = gdb.inferiors()[0]                   34         inf = gdb.inferiors()[0]
 34                                                    35 
 35         # read in prb structure                    36         # read in prb structure
 36         prb_addr = int(str(gdb.parse_and_eval(     37         prb_addr = int(str(gdb.parse_and_eval("(void *)'printk.c'::prb")).split()[0], 16)
 37         sz = printk_ringbuffer_type.get_type()     38         sz = printk_ringbuffer_type.get_type().sizeof
 38         prb = utils.read_memoryview(inf, prb_a     39         prb = utils.read_memoryview(inf, prb_addr, sz).tobytes()
 39                                                    40 
 40         # read in descriptor ring structure        41         # read in descriptor ring structure
 41         off = printk_ringbuffer_type.get_type(     42         off = printk_ringbuffer_type.get_type()['desc_ring'].bitpos // 8
 42         addr = prb_addr + off                      43         addr = prb_addr + off
 43         sz = prb_desc_ring_type.get_type().siz     44         sz = prb_desc_ring_type.get_type().sizeof
 44         desc_ring = utils.read_memoryview(inf,     45         desc_ring = utils.read_memoryview(inf, addr, sz).tobytes()
 45                                                    46 
 46         # read in descriptor count, size, and  !!  47         # read in descriptor array
 47         off = prb_desc_ring_type.get_type()['c     48         off = prb_desc_ring_type.get_type()['count_bits'].bitpos // 8
 48         desc_ring_count = 1 << utils.read_u32(     49         desc_ring_count = 1 << utils.read_u32(desc_ring, off)
 49         desc_sz = prb_desc_type.get_type().siz     50         desc_sz = prb_desc_type.get_type().sizeof
 50         off = prb_desc_ring_type.get_type()['d     51         off = prb_desc_ring_type.get_type()['descs'].bitpos // 8
 51         desc_addr = utils.read_ulong(desc_ring !!  52         addr = utils.read_ulong(desc_ring, off)
                                                   >>  53         descs = utils.read_memoryview(inf, addr, desc_sz * desc_ring_count).tobytes()
 52                                                    54 
 53         # read in info size and address        !!  55         # read in info array
 54         info_sz = printk_info_type.get_type().     56         info_sz = printk_info_type.get_type().sizeof
 55         off = prb_desc_ring_type.get_type()['i     57         off = prb_desc_ring_type.get_type()['infos'].bitpos // 8
 56         info_addr = utils.read_ulong(desc_ring !!  58         addr = utils.read_ulong(desc_ring, off)
                                                   >>  59         infos = utils.read_memoryview(inf, addr, info_sz * desc_ring_count).tobytes()
 57                                                    60 
 58         # read in text data ring structure         61         # read in text data ring structure
 59         off = printk_ringbuffer_type.get_type(     62         off = printk_ringbuffer_type.get_type()['text_data_ring'].bitpos // 8
 60         addr = prb_addr + off                      63         addr = prb_addr + off
 61         sz = prb_data_ring_type.get_type().siz     64         sz = prb_data_ring_type.get_type().sizeof
 62         text_data_ring = utils.read_memoryview     65         text_data_ring = utils.read_memoryview(inf, addr, sz).tobytes()
 63                                                    66 
 64         # read in text data size and address   !!  67         # read in text data
 65         off = prb_data_ring_type.get_type()['s     68         off = prb_data_ring_type.get_type()['size_bits'].bitpos // 8
 66         text_data_sz = 1 << utils.read_u32(tex     69         text_data_sz = 1 << utils.read_u32(text_data_ring, off)
 67         off = prb_data_ring_type.get_type()['d     70         off = prb_data_ring_type.get_type()['data'].bitpos // 8
 68         text_data_addr = utils.read_ulong(text !!  71         addr = utils.read_ulong(text_data_ring, off)
                                                   >>  72         text_data = utils.read_memoryview(inf, addr, text_data_sz).tobytes()
                                                   >>  73 
                                                   >>  74         counter_off = atomic_long_type.get_type()['counter'].bitpos // 8
 69                                                    75 
 70         sv_off = prb_desc_type.get_type()['sta     76         sv_off = prb_desc_type.get_type()['state_var'].bitpos // 8
 71                                                    77 
 72         off = prb_desc_type.get_type()['text_b     78         off = prb_desc_type.get_type()['text_blk_lpos'].bitpos // 8
 73         begin_off = off + (prb_data_blk_lpos_t     79         begin_off = off + (prb_data_blk_lpos_type.get_type()['begin'].bitpos // 8)
 74         next_off = off + (prb_data_blk_lpos_ty     80         next_off = off + (prb_data_blk_lpos_type.get_type()['next'].bitpos // 8)
 75                                                    81 
 76         ts_off = printk_info_type.get_type()['     82         ts_off = printk_info_type.get_type()['ts_nsec'].bitpos // 8
 77         len_off = printk_info_type.get_type()[     83         len_off = printk_info_type.get_type()['text_len'].bitpos // 8
 78                                                    84 
 79         # definitions from kernel/printk/print     85         # definitions from kernel/printk/printk_ringbuffer.h
 80         desc_committed = 1                         86         desc_committed = 1
 81         desc_finalized = 2                         87         desc_finalized = 2
 82         desc_sv_bits = utils.get_long_type().s     88         desc_sv_bits = utils.get_long_type().sizeof * 8
 83         desc_flags_shift = desc_sv_bits - 2        89         desc_flags_shift = desc_sv_bits - 2
 84         desc_flags_mask = 3 << desc_flags_shif     90         desc_flags_mask = 3 << desc_flags_shift
 85         desc_id_mask = ~desc_flags_mask            91         desc_id_mask = ~desc_flags_mask
 86                                                    92 
 87         # read in tail and head descriptor ids     93         # read in tail and head descriptor ids
 88         off = prb_desc_ring_type.get_type()['t     94         off = prb_desc_ring_type.get_type()['tail_id'].bitpos // 8
 89         tail_id = utils.read_atomic_long(desc_ !!  95         tail_id = utils.read_u64(desc_ring, off + counter_off)
 90         off = prb_desc_ring_type.get_type()['h     96         off = prb_desc_ring_type.get_type()['head_id'].bitpos // 8
 91         head_id = utils.read_atomic_long(desc_ !!  97         head_id = utils.read_u64(desc_ring, off + counter_off)
 92                                                    98 
 93         did = tail_id                              99         did = tail_id
 94         while True:                               100         while True:
 95             ind = did % desc_ring_count           101             ind = did % desc_ring_count
 96             desc_off = desc_sz * ind              102             desc_off = desc_sz * ind
 97             info_off = info_sz * ind              103             info_off = info_sz * ind
 98                                                   104 
 99             desc = utils.read_memoryview(inf,  << 
100                                                << 
101             # skip non-committed record           105             # skip non-committed record
102             state = 3 & (utils.read_atomic_lon !! 106             state = 3 & (utils.read_u64(descs, desc_off + sv_off +
                                                   >> 107                                         counter_off) >> desc_flags_shift)
103             if state != desc_committed and sta    108             if state != desc_committed and state != desc_finalized:
104                 if did == head_id:                109                 if did == head_id:
105                     break                         110                     break
106                 did = (did + 1) & desc_id_mask    111                 did = (did + 1) & desc_id_mask
107                 continue                          112                 continue
108                                                   113 
109             begin = utils.read_ulong(desc, beg !! 114             begin = utils.read_ulong(descs, desc_off + begin_off) % text_data_sz
110             end = utils.read_ulong(desc, next_ !! 115             end = utils.read_ulong(descs, desc_off + next_off) % text_data_sz
111                                                << 
112             info = utils.read_memoryview(inf,  << 
113                                                   116 
114             # handle data-less record             117             # handle data-less record
115             if begin & 1 == 1:                    118             if begin & 1 == 1:
116                 text = ""                         119                 text = ""
117             else:                                 120             else:
118                 # handle wrapping data block      121                 # handle wrapping data block
119                 if begin > end:                   122                 if begin > end:
120                     begin = 0                     123                     begin = 0
121                                                   124 
122                 # skip over descriptor id         125                 # skip over descriptor id
123                 text_start = begin + utils.get    126                 text_start = begin + utils.get_long_type().sizeof
124                                                   127 
125                 text_len = utils.read_u16(info !! 128                 text_len = utils.read_u16(infos, info_off + len_off)
126                                                   129 
127                 # handle truncated message        130                 # handle truncated message
128                 if end - text_start < text_len    131                 if end - text_start < text_len:
129                     text_len = end - text_star    132                     text_len = end - text_start
130                                                   133 
131                 text_data = utils.read_memoryv !! 134                 text = text_data[text_start:text_start + text_len].decode(
132                                                !! 135                     encoding='utf8', errors='replace')
133                 text = text_data[0:text_len].d << 
134                                                   136 
135             time_stamp = utils.read_u64(info,  !! 137             time_stamp = utils.read_u64(infos, info_off + ts_off)
136                                                   138 
137             for line in text.splitlines():        139             for line in text.splitlines():
138                 msg = u"[{time:12.6f}] {line}\    140                 msg = u"[{time:12.6f}] {line}\n".format(
139                     time=time_stamp / 10000000    141                     time=time_stamp / 1000000000.0,
140                     line=line)                    142                     line=line)
141                 # With python2 gdb.write will     143                 # With python2 gdb.write will attempt to convert unicode to
142                 # ascii and might fail so pass    144                 # ascii and might fail so pass an utf8-encoded str instead.
143                 if sys.hexversion < 0x03000000    145                 if sys.hexversion < 0x03000000:
144                     msg = msg.encode(encoding=    146                     msg = msg.encode(encoding='utf8', errors='replace')
145                 gdb.write(msg)                    147                 gdb.write(msg)
146                                                   148 
147             if did == head_id:                    149             if did == head_id:
148                 break                             150                 break
149             did = (did + 1) & desc_id_mask        151             did = (did + 1) & desc_id_mask
150                                                   152 
151                                                   153 
152 LxDmesg()                                         154 LxDmesg()
                                                      

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