[Qemu-devel] [PATCH] scripts/qemugdb: support coroutine backtrace in coredumps

[Stefan Hajnoczi <stefanha@redhat.com>]

Use the 'select-frame' GDB command to switch stacks instead of manually
setting the debugged thread's registers (this only works when debugging
a live process, not in a coredump).

Cc: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
---
Vladimir: Does this work for you?

 scripts/qemugdb/coroutine.py | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/scripts/qemugdb/coroutine.py b/scripts/qemugdb/coroutine.py
index ab699794ab..ed96434aee 100644
--- a/scripts/qemugdb/coroutine.py
+++ b/scripts/qemugdb/coroutine.py
@@ -77,13 +77,11 @@ def bt_jmpbuf(jmpbuf):
     for i in regs:
         old[i] = gdb.parse_and_eval('(uint64_t)$%s' % i)
 
-    for i in regs:
-        gdb.execute('set $%s = %s' % (i, regs[i]))
+    gdb.execute('select-frame %s %s' % (regs['rsp'], regs['rip']))
 
     gdb.execute('bt')
 
-    for i in regs:
-        gdb.execute('set $%s = %s' % (i, old[i]))
+    gdb.execute('select-frame %s %s' % (old['rsp'], old['rip']))
 
 def coroutine_to_jmpbuf(co):
     coroutine_pointer = co.cast(gdb.lookup_type('CoroutineUContext').pointer())
-- 
2.14.3