To help gdb reload symbol files from /proc/<pid>/maps, making it
possible to load debug info for ELF and PE modules for Wine processes.
When sourced (from ~/.gdbinit for instance), this adds a new
"load-symbol-files" command (with an "lsf" alias), which automatically
calls add-symbol-file on every mapped file that can be read as ELF or
PE, with the correct section offset.
The command has to be run manually, for instance after executing for
a while, to load new modules that may have been …
[View More]loaded, as there's no
way for gdb to be notified of such changes automatically.
Signed-off-by: Rémi Bernon <rbernon(a)codeweavers.com>
---
This is some script I've been using for a while, and more or less broken
versions are also used by other people, so I figured maybe it would be
better to have a proper working version officially distributed with Wine
source instead, as it's pretty useful for debugging Wine under gdb.
It's still a bit manual to use, as gdb cannot easily be notified of
dynamic library loading [1], but I think it's much better than having
nothing.
[1] in theory there's ways to do it using systemtap probes, but it's
going to be hard to make it work, especially for PE modules.
tools/gdbinit.py | 108 +++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 108 insertions(+)
create mode 100644 tools/gdbinit.py
diff --git a/tools/gdbinit.py b/tools/gdbinit.py
new file mode 100644
index 00000000000..265d97722b7
--- /dev/null
+++ b/tools/gdbinit.py
@@ -0,0 +1,108 @@
+#!/bin/env python3
+
+# Copyright 2021 Rémi Bernon for CodeWeavers
+#
+# This library is free software; you can redistribute it and/or
+# modify it under the terms of the GNU Lesser General Public
+# License as published by the Free Software Foundation; either
+# version 2.1 of the License, or (at your option) any later version.
+#
+# This library is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+# Lesser General Public License for more details.
+#
+# You should have received a copy of the GNU Lesser General Public
+# License along with this library; if not, write to the Free Software
+# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
+
+from __future__ import print_function
+
+import gdb
+import re
+import subprocess
+import sys
+
+class LoadSymbolFiles(gdb.Command):
+ 'Command to load symbol files directly from /proc/<pid>/maps.'
+
+ def __init__(self):
+ sup = super(LoadSymbolFiles, self)
+ sup.__init__('load-symbol-files', gdb.COMMAND_FILES, gdb.COMPLETE_NONE,
+ False)
+
+ self.libs = {}
+ gdb.execute('alias -a lsf = load-symbol-files', True)
+
+ def invoke(self, arg, from_tty):
+ pid = gdb.selected_inferior().pid
+ if not pid in self.libs: self.libs[pid] = {}
+
+ def command(cmd, confirm=from_tty):
+ to_string = not from_tty
+ gdb.execute(cmd, from_tty=confirm, to_string=to_string)
+
+ def execute(cmd):
+ return subprocess.check_output(cmd, stderr=subprocess.STDOUT) \
+ .decode('utf-8')
+
+ # load mappings addresses
+ libs = {}
+ with open('/proc/{}/maps'.format(pid), 'r') as maps:
+ for line in maps:
+ addr, _, _, _, node, path = re.split(r'\s+', line, 5)
+ path = path.strip()
+ if node == '0': continue
+ if path in libs: continue
+ libs[path] = int(addr.split('-')[0], 16)
+
+ # unload symbol file if address changed
+ for k in set(libs) & set(self.libs[pid]):
+ if libs[k] != self.libs[pid][k]:
+ command('remove-symbol-file "{}"'.format(k), confirm=False)
+ del self.libs[k]
+
+ # load symbol file for new mappings
+ for k in set(libs) - set(self.libs[pid]):
+ if arg is not None and re.search(arg, k) is None: continue
+ addr = self.libs[pid][k] = libs[k]
+ offs = None
+
+ try:
+ out = execute(['file', k])
+ except:
+ continue
+
+ # try loading mapping as ELF
+ try:
+ out = execute(['readelf', '-l', k])
+ for line in out.split('\n'):
+ if not 'LOAD' in line: continue
+ base = int(line.split()[2], 16)
+ break
+
+ out = execute(['objdump', '-h', k])
+ for line in out.split('\n'):
+ if not '.text' in line: continue
+ offs = int(line.split()[3], 16) - base
+ break
+ if offs is None: continue
+
+ # try again, assuming mapping is PE
+ except:
+ try:
+ out = execute(['objdump', '-h', k])
+ for line in out.split('\n'):
+ if not '.text' in line: continue
+ offs = int(line.split()[5], 16)
+ break
+ if offs is None: continue
+
+ except:
+ continue
+
+ command('add-symbol-file "{}" 0x{:x}'.format(k, addr + offs),
+ confirm=False)
+
+
+LoadSymbolFiles()
--
2.31.0
[View Less]
GCC11 implements new warnings. This serie of patches:
- works around a couple of false positive
- fixes a couple of bad handling of corner cases in error handling
- last patch should be reviewed by D3D folks. The fix is consistent with
function definition, and no regression appear in make test...
A+
---
Eric Pouech (6):
dlls/msvcrt*: ensure variable sse2_cw is set for all code paths in _control87 (GCC11)
In tests, ensure buffers passed as const pointers are always initialized (…
[View More]GCC11)
kernelbase: always return NULL in case of error in GetModuleHandleA (GCC11)
kernel32/tests: mark pointer as volatile when reading after allocated size
Workaround GCC11 complaining about sizeof(a)/sizeof(b) constructs when it's
d3dx9_36/tests: fixed order of parameters
dlls/d3dx9_36/mesh.c | 2 +-
dlls/d3dx9_36/tests/effect.c | 4 ++--
dlls/d3dx9_36/tests/mesh.c | 4 ++--
dlls/kernel32/tests/heap.c | 3 ++-
dlls/kernelbase/loader.c | 2 +-
dlls/kernelbase/tests/path.c | 1 +
dlls/msvcirt/tests/msvcirt.c | 5 +++--
dlls/msvcrt/math.c | 2 +-
dlls/shlwapi/tests/clist.c | 1 +
9 files changed, 14 insertions(+), 10 deletions(-)
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