[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
[Qemu-devel] [PATCH 1/4] scripts/qemugdb: get pthread_self from "info th
From: |
Vladimir Sementsov-Ogievskiy |
Subject: |
[Qemu-devel] [PATCH 1/4] scripts/qemugdb: get pthread_self from "info threads" command |
Date: |
Wed, 28 Mar 2018 20:32:35 +0300 |
When debugging a coredump, pthread_self can't be obtained from
function arch_prctl. Moreover if qemu crashed in coroutine, we
can't find 'start_thread' in current stack-trace. So, add a method,
actually proposed in 1138f24645e9e, which should work for gdb
version >= 7.3.
Signed-off-by: Vladimir Sementsov-Ogievskiy <address@hidden>
---
scripts/qemugdb/coroutine.py | 13 ++++++++++++-
1 file changed, 12 insertions(+), 1 deletion(-)
diff --git a/scripts/qemugdb/coroutine.py b/scripts/qemugdb/coroutine.py
index ab699794ab..ffaa45c464 100644
--- a/scripts/qemugdb/coroutine.py
+++ b/scripts/qemugdb/coroutine.py
@@ -14,6 +14,7 @@
# GNU GPL, version 2 or (at your option) any later version.
import gdb
+import re
VOID_PTR = gdb.lookup_type('void').pointer()
@@ -28,7 +29,17 @@ def get_fs_base():
return fs_base
def pthread_self():
- '''Fetch pthread_self() from the glibc start_thread function.'''
+ # Try read pthread_self from gdb command 'info threads'.
+ # Will fail for old gdb.
+ try:
+ threads = gdb.execute('info threads', False, True)
+ m = re.search('^\* 1 Thread (0x[0-9a-f]+)', threads, re.MULTILINE)
+ return int(m.group(1), 16)
+ except TypeError:
+ # gdb doesn't support third parameter for execute
+ pass
+
+ # Try fetch pthread_self() from the glibc start_thread function.
f = gdb.newest_frame()
while f.name() != 'start_thread':
f = f.older()
--
2.11.1