On Thu, 2010-10-28 at 14:36 +0200, Jan Kiszka wrote: > Am 26.10.2010 14:22, Zhiyuan Shao wrote: > > Hi team, > > > > I am a Qemu User, and using Qemu 0.13.0 to debugging the linux kernel > > code (Qemu+GDB). > > > > During the usage, I found the Qemu debugging console (i.e., entered by > > pressing Ctl+Alt+2 in Qemu SDL window or by passing "-monitor stdio" to > > Qemu in the command line) is rather difficult to use. > > Regarding usability in this scenario: You know that there is QEMU > monitor pass-through via gdb "monitor" command? > Yes, Just learned to use that. By gdb "monitor" command, the output of QEMU debugging console is redirected to gdb.
> > It can not show > > some important information, e.g., on i386 platform, which is my major > > interest, it can not show IDT, GDT information. Regarding the page > > mapping information, "info tlb" actually do a really bad job. > > > > On this side, I think Bochs is good. Unfortunately, it seems do not > > support gdb-stub debugging and general purpose debugging at the same > > time. > > > > I do not know if the Qemu team had made any plans to improve this? such > > as embedding the bochs debugging alike functionalities in future Qemu > > releases? > > The most important lacking feature is proper system-level debugging > support for gdb (via gdbstub). Once gdb has full access to all CPU > states of the x86 targets, you can pretty-print whatever you want inside > gdb via some nice Python scripts etc. > Are you mean that it is the responsibility of gdb to parse the output data of qemu built-in commands and generate user-friend output? Or grant gdb full access to the target machine, which is emulated by Qemu, and it is the responsibility of gdb again to generate easy-to-read output for the users? I think the first solution sounds more feasible, however, we still need more helpful built-in commands in Qemu. And it is hard to implement the second solution: By doing this, we may need to have full support from GDB community. Maybe, I am wrong. If possible, please give us more advices. Thanks! > Jan > Zhiyuan
