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-rw-r--r--scripts/gdb/linux/.gitignore1
-rw-r--r--scripts/gdb/linux/Makefile4
-rw-r--r--scripts/gdb/linux/config.py6
-rw-r--r--scripts/gdb/linux/cpus.py23
-rw-r--r--scripts/gdb/linux/dmesg.py145
-rw-r--r--scripts/gdb/linux/genpd.py12
-rw-r--r--scripts/gdb/linux/lists.py5
-rw-r--r--scripts/gdb/linux/proc.py15
-rw-r--r--scripts/gdb/linux/rbtree.py8
-rw-r--r--scripts/gdb/linux/symbols.py10
-rw-r--r--scripts/gdb/linux/tasks.py9
-rw-r--r--scripts/gdb/linux/utils.py21
-rw-r--r--scripts/gdb/vmlinux-gdb.py2
13 files changed, 188 insertions, 73 deletions
diff --git a/scripts/gdb/linux/.gitignore b/scripts/gdb/linux/.gitignore
index 2573543842d0..43234cbcb529 100644
--- a/scripts/gdb/linux/.gitignore
+++ b/scripts/gdb/linux/.gitignore
@@ -1,3 +1,4 @@
+# SPDX-License-Identifier: GPL-2.0-only
*.pyc
*.pyo
constants.py
diff --git a/scripts/gdb/linux/Makefile b/scripts/gdb/linux/Makefile
index 124755087510..48941faa6ea6 100644
--- a/scripts/gdb/linux/Makefile
+++ b/scripts/gdb/linux/Makefile
@@ -7,7 +7,7 @@ symlinks := $(patsubst $(srctree)/$(src)/%,%,$(wildcard $(srctree)/$(src)/*.py))
quiet_cmd_symlink = SYMLINK $@
cmd_symlink = ln -fsn $(patsubst $(obj)/%,$(abspath $(srctree))/$(src)/%,$@) $@
-extra-y += $(symlinks)
+always-y += $(symlinks)
$(addprefix $(obj)/, $(symlinks)): FORCE
$(call if_changed,symlink)
@@ -18,7 +18,7 @@ quiet_cmd_gen_constants_py = GEN $@
$(CPP) -E -x c -P $(c_flags) $< > $@ ;\
sed -i '1,/<!-- end-c-headers -->/d;' $@
-extra-y += constants.py
+always-y += constants.py
$(obj)/constants.py: $(src)/constants.py.in FORCE
$(call if_changed_dep,gen_constants_py)
diff --git a/scripts/gdb/linux/config.py b/scripts/gdb/linux/config.py
index 90e1565b1967..8843ab3cbadd 100644
--- a/scripts/gdb/linux/config.py
+++ b/scripts/gdb/linux/config.py
@@ -24,9 +24,9 @@ class LxConfigDump(gdb.Command):
filename = arg
try:
- py_config_ptr = gdb.parse_and_eval("kernel_config_data + 8")
- py_config_size = gdb.parse_and_eval(
- "sizeof(kernel_config_data) - 1 - 8 * 2")
+ py_config_ptr = gdb.parse_and_eval("&kernel_config_data")
+ py_config_ptr_end = gdb.parse_and_eval("&kernel_config_data_end")
+ py_config_size = py_config_ptr_end - py_config_ptr
except gdb.error as e:
raise gdb.GdbError("Can't find config, enable CONFIG_IKCONFIG?")
diff --git a/scripts/gdb/linux/cpus.py b/scripts/gdb/linux/cpus.py
index 008e62f3190d..15fc4626d236 100644
--- a/scripts/gdb/linux/cpus.py
+++ b/scripts/gdb/linux/cpus.py
@@ -16,6 +16,9 @@ import gdb
from linux import tasks, utils
+task_type = utils.CachedType("struct task_struct")
+
+
MAX_CPUS = 4096
@@ -156,6 +159,23 @@ Note that VAR has to be quoted as string."""
PerCpu()
+def get_current_task(cpu):
+ task_ptr_type = task_type.get_type().pointer()
+
+ if utils.is_target_arch("x86"):
+ var_ptr = gdb.parse_and_eval("&current_task")
+ return per_cpu(var_ptr, cpu).dereference()
+ elif utils.is_target_arch("aarch64"):
+ current_task_addr = gdb.parse_and_eval("$SP_EL0")
+ if((current_task_addr >> 63) != 0):
+ current_task = current_task_addr.cast(task_ptr_type)
+ return current_task.dereference()
+ else:
+ raise gdb.GdbError("Sorry, obtaining the current task is not allowed "
+ "while running in userspace(EL0)")
+ else:
+ raise gdb.GdbError("Sorry, obtaining the current task is not yet "
+ "supported with this arch")
class LxCurrentFunc(gdb.Function):
"""Return current task.
@@ -167,8 +187,7 @@ number. If CPU is omitted, the CPU of the current context is used."""
super(LxCurrentFunc, self).__init__("lx_current")
def invoke(self, cpu=-1):
- var_ptr = gdb.parse_and_eval("&current_task")
- return per_cpu(var_ptr, cpu).dereference()
+ return get_current_task(cpu)
LxCurrentFunc()
diff --git a/scripts/gdb/linux/dmesg.py b/scripts/gdb/linux/dmesg.py
index 2fa7bb83885f..c771831eb077 100644
--- a/scripts/gdb/linux/dmesg.py
+++ b/scripts/gdb/linux/dmesg.py
@@ -16,8 +16,12 @@ import sys
from linux import utils
-printk_log_type = utils.CachedType("struct printk_log")
-
+printk_info_type = utils.CachedType("struct printk_info")
+prb_data_blk_lpos_type = utils.CachedType("struct prb_data_blk_lpos")
+prb_desc_type = utils.CachedType("struct prb_desc")
+prb_desc_ring_type = utils.CachedType("struct prb_desc_ring")
+prb_data_ring_type = utils.CachedType("struct prb_data_ring")
+printk_ringbuffer_type = utils.CachedType("struct printk_ringbuffer")
class LxDmesg(gdb.Command):
"""Print Linux kernel log buffer."""
@@ -26,44 +30,109 @@ class LxDmesg(gdb.Command):
super(LxDmesg, self).__init__("lx-dmesg", gdb.COMMAND_DATA)
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")
+
+ # 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 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
+ desc_addr = utils.read_ulong(desc_ring, off)
+
+ # read in info size and address
+ info_sz = printk_info_type.get_type().sizeof
+ off = prb_desc_ring_type.get_type()['infos'].bitpos // 8
+ 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
+ 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 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
+ text_data_addr = utils.read_ulong(text_data_ring, off)
+
+ 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)
+
+ ts_off = printk_info_type.get_type()['ts_nsec'].bitpos // 8
+ len_off = printk_info_type.get_type()['text_len'].bitpos // 8
+
+ # definitions from kernel/printk/printk_ringbuffer.h
+ desc_committed = 1
+ desc_finalized = 2
+ desc_sv_bits = utils.get_long_type().sizeof * 8
+ desc_flags_shift = desc_sv_bits - 2
+ desc_flags_mask = 3 << desc_flags_shift
+ 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_atomic_long(desc_ring, off)
+ off = prb_desc_ring_type.get_type()['head_id'].bitpos // 8
+ head_id = utils.read_atomic_long(desc_ring, off)
+
+ did = tail_id
+ while True:
+ ind = did % desc_ring_count
+ 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_atomic_long(desc, sv_off) >> desc_flags_shift)
+ if state != desc_committed and state != desc_finalized:
+ if did == head_id:
break
- pos = log_buf_2nd_half
+ did = (did + 1) & desc_id_mask
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)
+ 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:
+ 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(info, len_off)
+
+ # handle truncated message
+ if end - text_start < text_len:
+ text_len = end - text_start
+
+ 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(info, ts_off)
for line in text.splitlines():
msg = u"[{time:12.6f}] {line}\n".format(
@@ -75,7 +144,9 @@ class LxDmesg(gdb.Command):
msg = msg.encode(encoding='utf8', errors='replace')
gdb.write(msg)
- pos += length
+ if did == head_id:
+ break
+ did = (did + 1) & desc_id_mask
LxDmesg()
diff --git a/scripts/gdb/linux/genpd.py b/scripts/gdb/linux/genpd.py
index 6ca93bd2949e..39cd1abd8559 100644
--- a/scripts/gdb/linux/genpd.py
+++ b/scripts/gdb/linux/genpd.py
@@ -49,17 +49,17 @@ Output is similar to /sys/kernel/debug/pm_genpd/pm_genpd_summary'''
else:
status_string = 'off-{}'.format(genpd['state_idx'])
- slave_names = []
+ child_names = []
for link in list_for_each_entry(
- genpd['master_links'],
+ genpd['parent_links'],
device_link_type.get_type().pointer(),
- 'master_node'):
- slave_names.apend(link['slave']['name'])
+ 'parent_node'):
+ child_names.append(link['child']['name'])
gdb.write('%-30s %-15s %s\n' % (
genpd['name'].string(),
status_string,
- ', '.join(slave_names)))
+ ', '.join(child_names)))
# Print devices in domain
for pm_data in list_for_each_entry(genpd['dev_list'],
@@ -70,7 +70,7 @@ Output is similar to /sys/kernel/debug/pm_genpd/pm_genpd_summary'''
gdb.write(' %-50s %s\n' % (kobj_path, rtpm_status_str(dev)))
def invoke(self, arg, from_tty):
- gdb.write('domain status slaves\n');
+ gdb.write('domain status children\n');
gdb.write(' /device runtime status\n');
gdb.write('----------------------------------------------------------------------\n');
for genpd in list_for_each_entry(
diff --git a/scripts/gdb/linux/lists.py b/scripts/gdb/linux/lists.py
index c487ddf09d38..bae4d70b7eae 100644
--- a/scripts/gdb/linux/lists.py
+++ b/scripts/gdb/linux/lists.py
@@ -27,6 +27,11 @@ def list_for_each(head):
raise TypeError("Must be struct list_head not {}"
.format(head.type))
+ if head['next'] == 0:
+ gdb.write("list_for_each: Uninitialized list '{}' treated as empty\n"
+ .format(head.address))
+ return
+
node = head['next'].dereference()
while node.address != head.address:
yield node.address
diff --git a/scripts/gdb/linux/proc.py b/scripts/gdb/linux/proc.py
index 6a56bba233a9..09cd871925a5 100644
--- a/scripts/gdb/linux/proc.py
+++ b/scripts/gdb/linux/proc.py
@@ -167,6 +167,9 @@ values of that process namespace"""
if not namespace:
raise gdb.GdbError("No namespace for current process")
+ gdb.write("{:^18} {:^15} {:>9} {} {} options\n".format(
+ "mount", "super_block", "devname", "pathname", "fstype"))
+
for vfs in lists.list_for_each_entry(namespace['list'],
mount_ptr_type, "mnt_list"):
devname = vfs['mnt_devname'].string()
@@ -190,14 +193,10 @@ values of that process namespace"""
m_flags = int(vfs['mnt']['mnt_flags'])
rd = "ro" if (s_flags & constants.LX_SB_RDONLY) else "rw"
- gdb.write(
- "{} {} {} {}{}{} 0 0\n"
- .format(devname,
- pathname,
- fstype,
- rd,
- info_opts(FS_INFO, s_flags),
- info_opts(MNT_INFO, m_flags)))
+ gdb.write("{} {} {} {} {} {}{}{} 0 0\n".format(
+ vfs.format_string(), superblock.format_string(), devname,
+ pathname, fstype, rd, info_opts(FS_INFO, s_flags),
+ info_opts(MNT_INFO, m_flags)))
LxMounts()
diff --git a/scripts/gdb/linux/rbtree.py b/scripts/gdb/linux/rbtree.py
index 39db889b874c..fe462855eefd 100644
--- a/scripts/gdb/linux/rbtree.py
+++ b/scripts/gdb/linux/rbtree.py
@@ -12,12 +12,12 @@ rb_node_type = utils.CachedType("struct rb_node")
def rb_first(root):
if root.type == rb_root_type.get_type():
- node = node.address.cast(rb_root_type.get_type().pointer())
+ node = root.address.cast(rb_root_type.get_type().pointer())
elif root.type != rb_root_type.get_type().pointer():
raise gdb.GdbError("Must be struct rb_root not {}".format(root.type))
node = root['rb_node']
- if node is 0:
+ if node == 0:
return None
while node['rb_left']:
@@ -28,12 +28,12 @@ def rb_first(root):
def rb_last(root):
if root.type == rb_root_type.get_type():
- node = node.address.cast(rb_root_type.get_type().pointer())
+ node = root.address.cast(rb_root_type.get_type().pointer())
elif root.type != rb_root_type.get_type().pointer():
raise gdb.GdbError("Must be struct rb_root not {}".format(root.type))
node = root['rb_node']
- if node is 0:
+ if node == 0:
return None
while node['rb_right']:
diff --git a/scripts/gdb/linux/symbols.py b/scripts/gdb/linux/symbols.py
index be984aa29b75..dc07b6d12e30 100644
--- a/scripts/gdb/linux/symbols.py
+++ b/scripts/gdb/linux/symbols.py
@@ -96,7 +96,7 @@ lx-symbols command."""
return ""
attrs = sect_attrs['attrs']
section_name_to_address = {
- attrs[n]['name'].string(): attrs[n]['address']
+ attrs[n]['battr']['attr']['name'].string(): attrs[n]['address']
for n in range(int(sect_attrs['nsections']))}
args = []
for section_name in [".data", ".data..read_mostly", ".rodata", ".bss",
@@ -148,7 +148,8 @@ lx-symbols command."""
# drop all current symbols and reload vmlinux
orig_vmlinux = 'vmlinux'
for obj in gdb.objfiles():
- if obj.filename.endswith('vmlinux'):
+ if (obj.filename.endswith('vmlinux') or
+ obj.filename.endswith('vmlinux.debug')):
orig_vmlinux = obj.filename
gdb.execute("symbol-file", to_string=True)
gdb.execute("symbol-file {0}".format(orig_vmlinux))
@@ -164,7 +165,8 @@ lx-symbols command."""
saved_state['breakpoint'].enabled = saved_state['enabled']
def invoke(self, arg, from_tty):
- self.module_paths = [os.path.expanduser(p) for p in arg.split()]
+ self.module_paths = [os.path.abspath(os.path.expanduser(p))
+ for p in arg.split()]
self.module_paths.append(os.getcwd())
# enforce update
@@ -178,7 +180,7 @@ lx-symbols command."""
self.breakpoint.delete()
self.breakpoint = None
self.breakpoint = LoadModuleBreakpoint(
- "kernel/module.c:do_init_module", self)
+ "kernel/module/main.c:do_init_module", self)
else:
gdb.write("Note: symbol update on module loading not supported "
"with this gdb version\n")
diff --git a/scripts/gdb/linux/tasks.py b/scripts/gdb/linux/tasks.py
index 0301dc1e0138..17ec19e9b5bf 100644
--- a/scripts/gdb/linux/tasks.py
+++ b/scripts/gdb/linux/tasks.py
@@ -73,11 +73,12 @@ class LxPs(gdb.Command):
super(LxPs, self).__init__("lx-ps", gdb.COMMAND_DATA)
def invoke(self, arg, from_tty):
+ gdb.write("{:>10} {:>12} {:>7}\n".format("TASK", "PID", "COMM"))
for task in task_lists():
- gdb.write("{address} {pid} {comm}\n".format(
- address=task,
- pid=task["pid"],
- comm=task["comm"].string()))
+ gdb.write("{} {:^5} {}\n".format(
+ task.format_string().split()[0],
+ task["pid"].format_string(),
+ task["comm"].string()))
LxPs()
diff --git a/scripts/gdb/linux/utils.py b/scripts/gdb/linux/utils.py
index ea94221dbd39..1553f68716cc 100644
--- a/scripts/gdb/linux/utils.py
+++ b/scripts/gdb/linux/utils.py
@@ -35,13 +35,12 @@ class CachedType:
long_type = CachedType("long")
-
+atomic_long_type = CachedType("atomic_long_t")
def get_long_type():
global long_type
return long_type.get_type()
-
def offset_of(typeobj, field):
element = gdb.Value(0).cast(typeobj)
return int(str(element[field].address).split()[0], 16)
@@ -123,6 +122,24 @@ def read_u64(buffer, offset):
return read_u32(buffer, offset + 4) + (read_u32(buffer, offset) << 32)
+def read_ulong(buffer, offset):
+ if get_long_type().sizeof == 8:
+ return read_u64(buffer, offset)
+ else:
+ return read_u32(buffer, offset)
+
+atomic_long_counter_offset = atomic_long_type.get_type()['counter'].bitpos
+atomic_long_counter_sizeof = atomic_long_type.get_type()['counter'].type.sizeof
+
+def read_atomic_long(buffer, offset):
+ global atomic_long_counter_offset
+ global atomic_long_counter_sizeof
+
+ if atomic_long_counter_sizeof == 8:
+ return read_u64(buffer, offset + atomic_long_counter_offset)
+ else:
+ return read_u32(buffer, offset + atomic_long_counter_offset)
+
target_arch = None
diff --git a/scripts/gdb/vmlinux-gdb.py b/scripts/gdb/vmlinux-gdb.py
index 4136dc2c59df..3e8d3669f0ce 100644
--- a/scripts/gdb/vmlinux-gdb.py
+++ b/scripts/gdb/vmlinux-gdb.py
@@ -13,7 +13,7 @@
import os
-sys.path.insert(0, os.path.dirname(__file__) + "/scripts/gdb")
+sys.path.insert(0, os.path.dirname(os.path.abspath(__file__)) + "/scripts/gdb")
try:
gdb.parse_and_eval("0")
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.