* [Qemu-devel] About QEMU debugging console
@ 2010-10-26 12:22 ` Zhiyuan Shao
2010-10-26 18:59 ` Blue Swirl
2010-10-28 12:36 ` [Qemu-devel] " Jan Kiszka
0 siblings, 2 replies; 10+ messages in thread
From: Zhiyuan Shao @ 2010-10-26 12:22 UTC (permalink / raw)
To: qemu-devel
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. 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?
Thanks!
Zhiyuan
^ permalink raw reply [flat|nested] 10+ messages in thread
* Re: [Qemu-devel] About QEMU debugging console
2010-10-26 12:22 ` Zhiyuan Shao
@ 2010-10-26 18:59 ` Blue Swirl
2010-10-27 1:10 ` Zhiyuan Shao
2010-10-28 12:36 ` [Qemu-devel] " Jan Kiszka
1 sibling, 1 reply; 10+ messages in thread
From: Blue Swirl @ 2010-10-26 18:59 UTC (permalink / raw)
To: Zhiyuan Shao; +Cc: qemu-devel
On Tue, Oct 26, 2010 at 12:22 PM, Zhiyuan Shao <zyshao@hust.edu.cn> 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. 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.
How is that bad?
> 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?
Perhaps nobody were aware that there were any lack of functionalities.
I think these should be very easy to add.
^ permalink raw reply [flat|nested] 10+ messages in thread
* Re: [Qemu-devel] About QEMU debugging console
@ 2010-10-27 1:10 ` Zhiyuan Shao
2010-10-27 20:07 ` Blue Swirl
0 siblings, 1 reply; 10+ messages in thread
From: Zhiyuan Shao @ 2010-10-27 1:10 UTC (permalink / raw)
To: Blue Swirl; +Cc: Zhiyuan Shao, qemu-devel
On Tue, 2010-10-26 at 18:59 +0000, Blue Swirl wrote:
> On Tue, Oct 26, 2010 at 12:22 PM, Zhiyuan Shao <zyshao@hust.edu.cn> 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. 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.
>
> How is that bad?
>
I booted a Linux OS (i386 with PAE support), and has following
virtual-to-physical mappings:
[0xff00-0000,0xffbf-ffff] -> [0x0000-0000, 0x00bf-ffff]
[0x0000-0000,0x00ff-ffff] -> [0x0000-0000, 0x00ff-ffff]
while now, with "info mem" command of Qemu debugging console, the output
is like:
(qemu) info mem
00000000-00400000 00400000 -r-
00c00000-00c08000 00008000 -rw
00c08000-00c09000 00001000 ur-
00c09000-00c0a000 00001000 urw
00c0e000-00c0f000 00001000 urw
00c10000-00c11000 00001000 -r-
00c11000-00c12000 00001000 ur-
00c12000-00c13000 00001000 -r-
00c14000-00c16000 00002000 -r-
00c1b000-00c1e000 00003000 -rw
00c20000-00c40000 00020000 -rw
00c40000-00c41000 00001000 -r-
00c41000-00c42000 00001000 ur-
00c42000-00c43000 00001000 -rw
00c44000-00c60000 0001c000 -rw
00c67000-00c70000 00009000 -rw
00c71000-00c74000 00003000 ur-
00c75000-00c76000 00001000 urw
00c77000-00c78000 00001000 ur-
00c78000-00c79000 00001000 -rw
00c7a000-00d00000 00086000 -rw
00d18000-00d19000 00001000 urw
00d19000-00d1a000 00001000 -rw
00d1d000-00d1e000 00001000 -r-
00d22000-00d23000 00001000 -r-
00d2a000-00d2b000 00001000 -rw
00df0000-00df1000 00001000 -r-
00df1000-00df2000 00001000 urw
00df4000-00df5000 00001000 -r-
00df5000-00df6000 00001000 urw
00df7000-00df8000 00001000 urw
01000000-01400000 00400000 -rw
01400000-01800000 00400000 -r-
01800000-01c00000 00400000 urw
01c00000-02000000 00400000 -rw
04c00000-05000000 00400000 ur-
05c00000-06000000 00400000 -rw
0bc00000-0c000000 00400000 -r-
0c800000-0cc00000 00400000 urw
0d800000-0e000000 00800000 ur-
0e400000-0e800000 00400000 ur-
10400000-10800000 00400000 -rw
12000000-12001000 00001000 -rw
12002000-12003000 00001000 -rw
12004000-12005000 00001000 -rw
12006000-12007000 00001000 -rw
12008000-12009000 00001000 -rw
1200a000-1200b000 00001000 -rw
1200c000-1200d000 00001000 -rw
1200e000-1200f000 00001000 -rw
13bf0000-13bf1000 00001000 -rw
13bf2000-13bf3000 00001000 -rw
13bf4000-13bf5000 00001000 -rw
13bf6000-13bf7000 00001000 -rw
13bf8000-13bf9000 00001000 -rw
13bfa000-13bfb000 00001000 -rw
Donot know what the "active virtual memory mappings" means for "info
mem" command, but the results displayed is not very likely being
correct.
While with "info tlb" command:
(qemu) info tlb
00000000: 15c00000 -PDA-T--
00c00000: f000f000 G-D-C--W
00c01000: f000f000 G-D-C--W
00c02000: f000e000 --D----W
00c03000: f000f000 G-D-C--W
00c04000: f000f000 G-D-C--W
00c05000: f000f000 G-D-C--W
00c06000: f000f000 G-D-C--W
00c07000: f000f000 G-D-C--W
00c08000: f000f000 ---A--U-
00c09000: f000e000 G-----UW
00c0e000: f000e000 G-D-C-UW
00c10000: c0008000 G--ACT--
00c11000: f000f000 --D--TU-
00c12000: f000f000 --D-----
00c14000: f000e000 G--ACT--
00c15000: f000f000 --D-CT--
00c1b000: f000f000 G-D-C--W
00c1c000: f000f000 G-D-C--W
00c1d000: f000f000 G-D-C--W
00c20000: f000f000 G-D-C--W
00c21000: f000f000 G-D-C--W
00c22000: f000f000 G-D-C--W
00c23000: f000f000 G-D-C--W
00c24000: f000f000 G-D-C--W
00c25000: f000f000 G-D-C--W
00c26000: f000f000 G-D-C--W
00c27000: f000f000 G-D-C--W
00c28000: f000f000 G-D-C--W
00c29000: f000f000 G-D-C--W
00c2a000: f000f000 G-D-C--W
00c2b000: f000f000 G-D-C--W
00c2c000: f000f000 G-D-C--W
00c2d000: f000f000 G-D-C--W
00c2e000: f000f000 G-D-C--W
00c2f000: f000f000 G-D-C--W
00c30000: f000f000 G-D-C--W
00c31000: f000f000 G-D-C--W
00c32000: f000f000 G-D-C--W
00c33000: f000f000 G-D-C--W
00c34000: f000f000 G-D-C--W
00c35000: f000f000 G-D-C--W
00c36000: f000f000 G-D-C--W
00c37000: f000f000 G-D-C--W
00c38000: f000f000 G-D-C--W
00c39000: f000f000 G-D-C--W
00c3a000: f000f000 G-D-C--W
00c3b000: f000f000 G-D-C--W
00c3c000: f000f000 G-D-C--W
00c3d000: f000f000 G-D-C--W
00c3e000: f000f000 G-D-C--W
00c3f000: f000f000 G-D-C--W
00c40000: f000e000 --D-CT--
00c41000: 9fc00000 ---ACTU-
00c42000: f000f000 G-D-C--W
00c44000: f000f000 G-D-C--W
00c45000: f000f000 G-D-C--W
00c46000: f000f000 G-D-C--W
00c47000: f000f000 G-D-C--W
00c48000: f000f000 G-D-C--W
00c49000: f000f000 G-D-C--W
00c4a000: f000f000 G-D-C--W
00c4b000: f000f000 G-D-C--W
00c4c000: f000f000 G-D-C--W
00c4d000: f000f000 G-D-C--W
00c4e000: f000f000 G-D-C--W
00c4f000: f000f000 G-D-C--W
00c50000: f000f000 G-D-C--W
00c51000: f000f000 G-D-C--W
00c52000: f000f000 G-D-C--W
00c53000: f000f000 G-D-C--W
00c54000: f000f000 G-D-C--W
00c55000: f000f000 G-D-C--W
00c56000: f000f000 G-D-C--W
00c57000: f000f000 G-D-C--W
00c58000: f000f000 G-D-C--W
00c59000: f000f000 G-D-C--W
00c5a000: f000f000 G-D-C--W
00c5b000: f000f000 G-D-C--W
00c5c000: f000f000 G-D-C--W
00c5d000: f000f000 G-D-C--W
00c5e000: f000f000 G-D-C--W
00c5f000: f000f000 G-D-C--W
00c67000: f000f000 G-D-C--W
00c68000: f000f000 G-D-C--W
00c69000: f000f000 G-D-C--W
00c6a000: f000f000 G-D-C--W
00c6b000: f000f000 G-D-C--W
00c6c000: f000f000 G-D-C--W
00c6d000: f000f000 G-D-C--W
00c6e000: f000f000 G-D-C--W
00c6f000: f000f000 G-D-C--W
00c71000: f000f000 G-D---U-
00c72000: f000f000 G-D---U-
00c73000: f000f000 G-D---U-
00c75000: f000e000 --DA--UW
00c77000: f000f000 G-D---U-
00c78000: f000f000 G-D-C--W
00c7a000: f000f000 G-D-C--W
00c7b000: f000f000 G-D-C--W
00c7c000: f000f000 G-D-C--W
00c7d000: f000f000 G-D-C--W
00c7e000: f000f000 G-D-C--W
00c7f000: f000f000 G-D-C--W
00c80000: f000f000 G-D-C--W
00c81000: f000f000 G-D-C--W
00c82000: f000f000 G-D-C--W
00c83000: f000f000 G-D-C--W
00c84000: f000f000 G-D-C--W
00c85000: f000f000 G-D-C--W
00c86000: f000f000 G-D-C--W
00c87000: f000f000 G-D-C--W
00c88000: f000f000 G-D-C--W
00c89000: f000f000 G-D-C--W
00c8a000: f000f000 G-D-C--W
00c8b000: f000f000 G-D-C--W
00c8c000: f000f000 G-D-C--W
00c8d000: f000f000 G-D-C--W
00c8e000: f000f000 G-D-C--W
00c8f000: f000f000 G-D-C--W
00c90000: f000f000 G-D-C--W
00c91000: f000f000 G-D-C--W
00c92000: f000f000 G-D-C--W
00c93000: f000f000 G-D-C--W
00c94000: f000f000 G-D-C--W
00c95000: f000f000 G-D-C--W
00c96000: f000f000 G-D-C--W
00c97000: f000f000 G-D-C--W
00c98000: f000f000 G-D-C--W
00c99000: f000f000 G-D-C--W
00c9a000: f000f000 G-D-C--W
00c9b000: f000f000 G-D-C--W
00c9c000: f000f000 G-D-C--W
00c9d000: f000f000 G-D-C--W
00c9e000: f000f000 G-D-C--W
00c9f000: f000f000 G-D-C--W
00ca0000: f000f000 G-D-C--W
00ca1000: f000f000 G-D-C--W
00ca2000: f000f000 G-D-C--W
00ca3000: f000f000 G-D-C--W
00ca4000: f000f000 G-D-C--W
00ca5000: f000f000 G-D-C--W
00ca6000: f000f000 G-D-C--W
00ca7000: f000f000 G-D-C--W
00ca8000: f000f000 G-D-C--W
00ca9000: f000f000 G-D-C--W
00caa000: f000f000 G-D-C--W
00cab000: f000f000 G-D-C--W
00cac000: f000f000 G-D-C--W
00cad000: f000f000 G-D-C--W
00cae000: f000f000 G-D-C--W
00caf000: f000f000 G-D-C--W
00cb0000: f000f000 G-D-C--W
00cb1000: f000f000 G-D-C--W
00cb2000: f000f000 G-D-C--W
00cb3000: f000f000 G-D-C--W
00cb4000: f000f000 G-D-C--W
00cb5000: f000f000 G-D-C--W
00cb6000: f000f000 G-D-C--W
00cb7000: f000f000 G-D-C--W
00cb8000: f000f000 G-D-C--W
00cb9000: f000f000 G-D-C--W
00cba000: f000f000 G-D-C--W
00cbb000: f000f000 G-D-C--W
00cbc000: f000f000 G-D-C--W
00cbd000: f000f000 G-D-C--W
00cbe000: f000f000 G-D-C--W
00cbf000: f000f000 G-D-C--W
00cc0000: f000f000 G-D-C--W
00cc1000: f000f000 G-D-C--W
00cc2000: f000f000 G-D-C--W
00cc3000: f000f000 G-D-C--W
00cc4000: f000f000 G-D-C--W
00cc5000: f000f000 G-D-C--W
00cc6000: f000f000 G-D-C--W
00cc7000: f000f000 G-D-C--W
00cc8000: f000f000 G-D-C--W
00cc9000: f000f000 G-D-C--W
00cca000: f000f000 G-D-C--W
00ccb000: f000f000 G-D-C--W
00ccc000: f000f000 G-D-C--W
00ccd000: f000f000 G-D-C--W
00cce000: f000f000 G-D-C--W
00ccf000: f000f000 G-D-C--W
00cd0000: f000f000 G-D-C--W
00cd1000: f000f000 G-D-C--W
00cd2000: f000f000 G-D-C--W
00cd3000: f000f000 G-D-C--W
00cd4000: f000f000 G-D-C--W
00cd5000: f000f000 G-D-C--W
00cd6000: f000f000 G-D-C--W
00cd7000: f000f000 G-D-C--W
00cd8000: f000f000 G-D-C--W
00cd9000: f000f000 G-D-C--W
00cda000: f000f000 G-D-C--W
00cdb000: f000f000 G-D-C--W
00cdc000: f000f000 G-D-C--W
00cdd000: f000f000 G-D-C--W
00cde000: f000f000 G-D-C--W
00cdf000: f000f000 G-D-C--W
00ce0000: f000f000 G-D-C--W
00ce1000: f000f000 G-D-C--W
00ce2000: f000f000 G-D-C--W
00ce3000: f000f000 G-D-C--W
00ce4000: f000f000 G-D-C--W
00ce5000: f000f000 G-D-C--W
00ce6000: f000f000 G-D-C--W
00ce7000: f000f000 G-D-C--W
00ce8000: f000f000 G-D-C--W
00ce9000: f000f000 G-D-C--W
00cea000: f000f000 G-D-C--W
00ceb000: f000f000 G-D-C--W
00cec000: f000f000 G-D-C--W
00ced000: f000f000 G-D-C--W
00cee000: f000f000 G-D-C--W
00cef000: f000f000 G-D-C--W
00cf0000: f000f000 G-D-C--W
00cf1000: f000f000 G-D-C--W
00cf2000: f000f000 G-D-C--W
00cf3000: f000f000 G-D-C--W
00cf4000: f000f000 G-D-C--W
00cf5000: f000f000 G-D-C--W
00cf6000: f000f000 G-D-C--W
00cf7000: f000f000 G-D-C--W
00cf8000: f000f000 G-D-C--W
00cf9000: f000f000 G-D-C--W
00cfa000: f000f000 G-D-C--W
00cfb000: f000f000 G-D-C--W
00cfc000: f000f000 G-D-C--W
00cfd000: f000f000 G-D-C--W
00cfe000: f000f000 G-D-C--W
00cff000: f000f000 G-D-C--W
00d18000: d4000000 ------UW
00d19000: 00000000 -------W
00d1d000: 00c00000 G-------
00d22000: 00085000 G-DACT--
00d2a000: c0003000 G--A---W
00df0000: fe830000 --------
00df1000: 003f7000 G-DACTUW
00df4000: fe827000 --D-----
00df5000: a87cb000 --DACTUW
00df7000: 00000000 -----TUW
01000000: e4500000 GPDACT-W
01400000: 24500000 -P-A----
01800000: e0200000 GPDACTUW
01c00000: 00e00000 GP---T-W
04c00000: b8a00000 GP---TU-
05c00000: e2000000 GP-----W
0bc00000: 75f00000 GP---T--
0c800000: 13e00000 -PDACTUW
0d800000: 90f00000 GPDA--U-
0dc00000: 00200000 -P---TU-
0e400000: 00000000 -P---TU-
10400000: 90900000 -PDA-T-W
12000000: 002a8000 --DA---W
12002000: 00200000 --DA---W
12004000: 00400000 --DA---W
12006000: 00600000 --DA---W
12008000: 00800000 --DA---W
1200a000: 00a00000 --DA---W
1200c000: 00c00000 --DA---W
1200e000: 00e00000 --DA---W
13bf0000: 002a8000 --DA---W
13bf2000: 00200000 --DA---W
13bf4000: 00400000 --DA---W
13bf6000: 00600000 --DA---W
13bf8000: 00800000 --DA---W
13bfa000: 00a00000 --DA---W
(qemu)
Is here someone can explain such output?
> > 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?
>
> Perhaps nobody were aware that there were any lack of functionalities.
> I think these should be very easy to add.
>
This should be not so hard, and I may have a try in the close future.
The difficulty here is that you have to consider several paging
techniques invented by Intel, such as, i386, PAE, PSE(36), x86_64. And
these works ONLY for the i386 platform.
I just wondering: It is for sure that I am not the very first person who
encounter such problems in the history of Qemu development. Why these
simple functionalities were not added to the main release till now?
Thank!
^ permalink raw reply [flat|nested] 10+ messages in thread
* Re: [Qemu-devel] About QEMU debugging console
2010-10-27 1:10 ` Zhiyuan Shao
@ 2010-10-27 20:07 ` Blue Swirl
2010-10-28 2:20 ` Zhiyuan Shao
0 siblings, 1 reply; 10+ messages in thread
From: Blue Swirl @ 2010-10-27 20:07 UTC (permalink / raw)
To: Zhiyuan Shao; +Cc: qemu-devel
On Wed, Oct 27, 2010 at 1:10 AM, Zhiyuan Shao <zyshao@mail.hust.edu.cn> wrote:
> On Tue, 2010-10-26 at 18:59 +0000, Blue Swirl wrote:
>> On Tue, Oct 26, 2010 at 12:22 PM, Zhiyuan Shao <zyshao@hust.edu.cn> 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. 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.
>>
>> How is that bad?
>>
> I booted a Linux OS (i386 with PAE support), and has following
> virtual-to-physical mappings:
> [0xff00-0000,0xffbf-ffff] -> [0x0000-0000, 0x00bf-ffff]
> [0x0000-0000,0x00ff-ffff] -> [0x0000-0000, 0x00ff-ffff]
>
> while now, with "info mem" command of Qemu debugging console, the output
> is like:
> (qemu) info mem
> 00000000-00400000 00400000 -r-
> 00c00000-00c08000 00008000 -rw
> 00c08000-00c09000 00001000 ur-
> 00c09000-00c0a000 00001000 urw
> 00c0e000-00c0f000 00001000 urw
> 00c10000-00c11000 00001000 -r-
> 00c11000-00c12000 00001000 ur-
> 00c12000-00c13000 00001000 -r-
> 00c14000-00c16000 00002000 -r-
> 00c1b000-00c1e000 00003000 -rw
> 00c20000-00c40000 00020000 -rw
> 00c40000-00c41000 00001000 -r-
> 00c41000-00c42000 00001000 ur-
> 00c42000-00c43000 00001000 -rw
> 00c44000-00c60000 0001c000 -rw
> 00c67000-00c70000 00009000 -rw
> 00c71000-00c74000 00003000 ur-
> 00c75000-00c76000 00001000 urw
> 00c77000-00c78000 00001000 ur-
> 00c78000-00c79000 00001000 -rw
> 00c7a000-00d00000 00086000 -rw
> 00d18000-00d19000 00001000 urw
> 00d19000-00d1a000 00001000 -rw
> 00d1d000-00d1e000 00001000 -r-
> 00d22000-00d23000 00001000 -r-
> 00d2a000-00d2b000 00001000 -rw
> 00df0000-00df1000 00001000 -r-
> 00df1000-00df2000 00001000 urw
> 00df4000-00df5000 00001000 -r-
> 00df5000-00df6000 00001000 urw
> 00df7000-00df8000 00001000 urw
> 01000000-01400000 00400000 -rw
> 01400000-01800000 00400000 -r-
> 01800000-01c00000 00400000 urw
> 01c00000-02000000 00400000 -rw
> 04c00000-05000000 00400000 ur-
> 05c00000-06000000 00400000 -rw
> 0bc00000-0c000000 00400000 -r-
> 0c800000-0cc00000 00400000 urw
> 0d800000-0e000000 00800000 ur-
> 0e400000-0e800000 00400000 ur-
> 10400000-10800000 00400000 -rw
> 12000000-12001000 00001000 -rw
> 12002000-12003000 00001000 -rw
> 12004000-12005000 00001000 -rw
> 12006000-12007000 00001000 -rw
> 12008000-12009000 00001000 -rw
> 1200a000-1200b000 00001000 -rw
> 1200c000-1200d000 00001000 -rw
> 1200e000-1200f000 00001000 -rw
> 13bf0000-13bf1000 00001000 -rw
> 13bf2000-13bf3000 00001000 -rw
> 13bf4000-13bf5000 00001000 -rw
> 13bf6000-13bf7000 00001000 -rw
> 13bf8000-13bf9000 00001000 -rw
> 13bfa000-13bfb000 00001000 -rw
>
> Donot know what the "active virtual memory mappings" means for "info
> mem" command, but the results displayed is not very likely being
> correct.
>
> While with "info tlb" command:
>
> (qemu) info tlb
> 00000000: 15c00000 -PDA-T--
> 00c00000: f000f000 G-D-C--W
> 00c01000: f000f000 G-D-C--W
> 00c02000: f000e000 --D----W
> 00c03000: f000f000 G-D-C--W
> 00c04000: f000f000 G-D-C--W
> 00c05000: f000f000 G-D-C--W
> 00c06000: f000f000 G-D-C--W
> 00c07000: f000f000 G-D-C--W
> 00c08000: f000f000 ---A--U-
> 00c09000: f000e000 G-----UW
> 00c0e000: f000e000 G-D-C-UW
> 00c10000: c0008000 G--ACT--
> 00c11000: f000f000 --D--TU-
> 00c12000: f000f000 --D-----
> 00c14000: f000e000 G--ACT--
> 00c15000: f000f000 --D-CT--
> 00c1b000: f000f000 G-D-C--W
> 00c1c000: f000f000 G-D-C--W
> 00c1d000: f000f000 G-D-C--W
> 00c20000: f000f000 G-D-C--W
> 00c21000: f000f000 G-D-C--W
> 00c22000: f000f000 G-D-C--W
> 00c23000: f000f000 G-D-C--W
> 00c24000: f000f000 G-D-C--W
> 00c25000: f000f000 G-D-C--W
> 00c26000: f000f000 G-D-C--W
> 00c27000: f000f000 G-D-C--W
> 00c28000: f000f000 G-D-C--W
> 00c29000: f000f000 G-D-C--W
> 00c2a000: f000f000 G-D-C--W
> 00c2b000: f000f000 G-D-C--W
> 00c2c000: f000f000 G-D-C--W
> 00c2d000: f000f000 G-D-C--W
> 00c2e000: f000f000 G-D-C--W
> 00c2f000: f000f000 G-D-C--W
> 00c30000: f000f000 G-D-C--W
> 00c31000: f000f000 G-D-C--W
> 00c32000: f000f000 G-D-C--W
> 00c33000: f000f000 G-D-C--W
> 00c34000: f000f000 G-D-C--W
> 00c35000: f000f000 G-D-C--W
> 00c36000: f000f000 G-D-C--W
> 00c37000: f000f000 G-D-C--W
> 00c38000: f000f000 G-D-C--W
> 00c39000: f000f000 G-D-C--W
> 00c3a000: f000f000 G-D-C--W
> 00c3b000: f000f000 G-D-C--W
> 00c3c000: f000f000 G-D-C--W
> 00c3d000: f000f000 G-D-C--W
> 00c3e000: f000f000 G-D-C--W
> 00c3f000: f000f000 G-D-C--W
> 00c40000: f000e000 --D-CT--
> 00c41000: 9fc00000 ---ACTU-
> 00c42000: f000f000 G-D-C--W
> 00c44000: f000f000 G-D-C--W
> 00c45000: f000f000 G-D-C--W
> 00c46000: f000f000 G-D-C--W
> 00c47000: f000f000 G-D-C--W
> 00c48000: f000f000 G-D-C--W
> 00c49000: f000f000 G-D-C--W
> 00c4a000: f000f000 G-D-C--W
> 00c4b000: f000f000 G-D-C--W
> 00c4c000: f000f000 G-D-C--W
> 00c4d000: f000f000 G-D-C--W
> 00c4e000: f000f000 G-D-C--W
> 00c4f000: f000f000 G-D-C--W
> 00c50000: f000f000 G-D-C--W
> 00c51000: f000f000 G-D-C--W
> 00c52000: f000f000 G-D-C--W
> 00c53000: f000f000 G-D-C--W
> 00c54000: f000f000 G-D-C--W
> 00c55000: f000f000 G-D-C--W
> 00c56000: f000f000 G-D-C--W
> 00c57000: f000f000 G-D-C--W
> 00c58000: f000f000 G-D-C--W
> 00c59000: f000f000 G-D-C--W
> 00c5a000: f000f000 G-D-C--W
> 00c5b000: f000f000 G-D-C--W
> 00c5c000: f000f000 G-D-C--W
> 00c5d000: f000f000 G-D-C--W
> 00c5e000: f000f000 G-D-C--W
> 00c5f000: f000f000 G-D-C--W
> 00c67000: f000f000 G-D-C--W
> 00c68000: f000f000 G-D-C--W
> 00c69000: f000f000 G-D-C--W
> 00c6a000: f000f000 G-D-C--W
> 00c6b000: f000f000 G-D-C--W
> 00c6c000: f000f000 G-D-C--W
> 00c6d000: f000f000 G-D-C--W
> 00c6e000: f000f000 G-D-C--W
> 00c6f000: f000f000 G-D-C--W
> 00c71000: f000f000 G-D---U-
> 00c72000: f000f000 G-D---U-
> 00c73000: f000f000 G-D---U-
> 00c75000: f000e000 --DA--UW
> 00c77000: f000f000 G-D---U-
> 00c78000: f000f000 G-D-C--W
> 00c7a000: f000f000 G-D-C--W
> 00c7b000: f000f000 G-D-C--W
> 00c7c000: f000f000 G-D-C--W
> 00c7d000: f000f000 G-D-C--W
> 00c7e000: f000f000 G-D-C--W
> 00c7f000: f000f000 G-D-C--W
> 00c80000: f000f000 G-D-C--W
> 00c81000: f000f000 G-D-C--W
> 00c82000: f000f000 G-D-C--W
> 00c83000: f000f000 G-D-C--W
> 00c84000: f000f000 G-D-C--W
> 00c85000: f000f000 G-D-C--W
> 00c86000: f000f000 G-D-C--W
> 00c87000: f000f000 G-D-C--W
> 00c88000: f000f000 G-D-C--W
> 00c89000: f000f000 G-D-C--W
> 00c8a000: f000f000 G-D-C--W
> 00c8b000: f000f000 G-D-C--W
> 00c8c000: f000f000 G-D-C--W
> 00c8d000: f000f000 G-D-C--W
> 00c8e000: f000f000 G-D-C--W
> 00c8f000: f000f000 G-D-C--W
> 00c90000: f000f000 G-D-C--W
> 00c91000: f000f000 G-D-C--W
> 00c92000: f000f000 G-D-C--W
> 00c93000: f000f000 G-D-C--W
> 00c94000: f000f000 G-D-C--W
> 00c95000: f000f000 G-D-C--W
> 00c96000: f000f000 G-D-C--W
> 00c97000: f000f000 G-D-C--W
> 00c98000: f000f000 G-D-C--W
> 00c99000: f000f000 G-D-C--W
> 00c9a000: f000f000 G-D-C--W
> 00c9b000: f000f000 G-D-C--W
> 00c9c000: f000f000 G-D-C--W
> 00c9d000: f000f000 G-D-C--W
> 00c9e000: f000f000 G-D-C--W
> 00c9f000: f000f000 G-D-C--W
> 00ca0000: f000f000 G-D-C--W
> 00ca1000: f000f000 G-D-C--W
> 00ca2000: f000f000 G-D-C--W
> 00ca3000: f000f000 G-D-C--W
> 00ca4000: f000f000 G-D-C--W
> 00ca5000: f000f000 G-D-C--W
> 00ca6000: f000f000 G-D-C--W
> 00ca7000: f000f000 G-D-C--W
> 00ca8000: f000f000 G-D-C--W
> 00ca9000: f000f000 G-D-C--W
> 00caa000: f000f000 G-D-C--W
> 00cab000: f000f000 G-D-C--W
> 00cac000: f000f000 G-D-C--W
> 00cad000: f000f000 G-D-C--W
> 00cae000: f000f000 G-D-C--W
> 00caf000: f000f000 G-D-C--W
> 00cb0000: f000f000 G-D-C--W
> 00cb1000: f000f000 G-D-C--W
> 00cb2000: f000f000 G-D-C--W
> 00cb3000: f000f000 G-D-C--W
> 00cb4000: f000f000 G-D-C--W
> 00cb5000: f000f000 G-D-C--W
> 00cb6000: f000f000 G-D-C--W
> 00cb7000: f000f000 G-D-C--W
> 00cb8000: f000f000 G-D-C--W
> 00cb9000: f000f000 G-D-C--W
> 00cba000: f000f000 G-D-C--W
> 00cbb000: f000f000 G-D-C--W
> 00cbc000: f000f000 G-D-C--W
> 00cbd000: f000f000 G-D-C--W
> 00cbe000: f000f000 G-D-C--W
> 00cbf000: f000f000 G-D-C--W
> 00cc0000: f000f000 G-D-C--W
> 00cc1000: f000f000 G-D-C--W
> 00cc2000: f000f000 G-D-C--W
> 00cc3000: f000f000 G-D-C--W
> 00cc4000: f000f000 G-D-C--W
> 00cc5000: f000f000 G-D-C--W
> 00cc6000: f000f000 G-D-C--W
> 00cc7000: f000f000 G-D-C--W
> 00cc8000: f000f000 G-D-C--W
> 00cc9000: f000f000 G-D-C--W
> 00cca000: f000f000 G-D-C--W
> 00ccb000: f000f000 G-D-C--W
> 00ccc000: f000f000 G-D-C--W
> 00ccd000: f000f000 G-D-C--W
> 00cce000: f000f000 G-D-C--W
> 00ccf000: f000f000 G-D-C--W
> 00cd0000: f000f000 G-D-C--W
> 00cd1000: f000f000 G-D-C--W
> 00cd2000: f000f000 G-D-C--W
> 00cd3000: f000f000 G-D-C--W
> 00cd4000: f000f000 G-D-C--W
> 00cd5000: f000f000 G-D-C--W
> 00cd6000: f000f000 G-D-C--W
> 00cd7000: f000f000 G-D-C--W
> 00cd8000: f000f000 G-D-C--W
> 00cd9000: f000f000 G-D-C--W
> 00cda000: f000f000 G-D-C--W
> 00cdb000: f000f000 G-D-C--W
> 00cdc000: f000f000 G-D-C--W
> 00cdd000: f000f000 G-D-C--W
> 00cde000: f000f000 G-D-C--W
> 00cdf000: f000f000 G-D-C--W
> 00ce0000: f000f000 G-D-C--W
> 00ce1000: f000f000 G-D-C--W
> 00ce2000: f000f000 G-D-C--W
> 00ce3000: f000f000 G-D-C--W
> 00ce4000: f000f000 G-D-C--W
> 00ce5000: f000f000 G-D-C--W
> 00ce6000: f000f000 G-D-C--W
> 00ce7000: f000f000 G-D-C--W
> 00ce8000: f000f000 G-D-C--W
> 00ce9000: f000f000 G-D-C--W
> 00cea000: f000f000 G-D-C--W
> 00ceb000: f000f000 G-D-C--W
> 00cec000: f000f000 G-D-C--W
> 00ced000: f000f000 G-D-C--W
> 00cee000: f000f000 G-D-C--W
> 00cef000: f000f000 G-D-C--W
> 00cf0000: f000f000 G-D-C--W
> 00cf1000: f000f000 G-D-C--W
> 00cf2000: f000f000 G-D-C--W
> 00cf3000: f000f000 G-D-C--W
> 00cf4000: f000f000 G-D-C--W
> 00cf5000: f000f000 G-D-C--W
> 00cf6000: f000f000 G-D-C--W
> 00cf7000: f000f000 G-D-C--W
> 00cf8000: f000f000 G-D-C--W
> 00cf9000: f000f000 G-D-C--W
> 00cfa000: f000f000 G-D-C--W
> 00cfb000: f000f000 G-D-C--W
> 00cfc000: f000f000 G-D-C--W
> 00cfd000: f000f000 G-D-C--W
> 00cfe000: f000f000 G-D-C--W
> 00cff000: f000f000 G-D-C--W
> 00d18000: d4000000 ------UW
> 00d19000: 00000000 -------W
> 00d1d000: 00c00000 G-------
> 00d22000: 00085000 G-DACT--
> 00d2a000: c0003000 G--A---W
> 00df0000: fe830000 --------
> 00df1000: 003f7000 G-DACTUW
> 00df4000: fe827000 --D-----
> 00df5000: a87cb000 --DACTUW
> 00df7000: 00000000 -----TUW
> 01000000: e4500000 GPDACT-W
> 01400000: 24500000 -P-A----
> 01800000: e0200000 GPDACTUW
> 01c00000: 00e00000 GP---T-W
> 04c00000: b8a00000 GP---TU-
> 05c00000: e2000000 GP-----W
> 0bc00000: 75f00000 GP---T--
> 0c800000: 13e00000 -PDACTUW
> 0d800000: 90f00000 GPDA--U-
> 0dc00000: 00200000 -P---TU-
> 0e400000: 00000000 -P---TU-
> 10400000: 90900000 -PDA-T-W
> 12000000: 002a8000 --DA---W
> 12002000: 00200000 --DA---W
> 12004000: 00400000 --DA---W
> 12006000: 00600000 --DA---W
> 12008000: 00800000 --DA---W
> 1200a000: 00a00000 --DA---W
> 1200c000: 00c00000 --DA---W
> 1200e000: 00e00000 --DA---W
> 13bf0000: 002a8000 --DA---W
> 13bf2000: 00200000 --DA---W
> 13bf4000: 00400000 --DA---W
> 13bf6000: 00600000 --DA---W
> 13bf8000: 00800000 --DA---W
> 13bfa000: 00a00000 --DA---W
> (qemu)
>
> Is here someone can explain such output?
The output is generated in monitor.c:1812:1926. The functions use only
uint32_t, so I suppose PAE support has not been added.
>> > 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?
>>
>> Perhaps nobody were aware that there were any lack of functionalities.
>> I think these should be very easy to add.
>>
>
> This should be not so hard, and I may have a try in the close future.
> The difficulty here is that you have to consider several paging
> techniques invented by Intel, such as, i386, PAE, PSE(36), x86_64. And
> these works ONLY for the i386 platform.
>
> I just wondering: It is for sure that I am not the very first person who
> encounter such problems in the history of Qemu development. Why these
> simple functionalities were not added to the main release till now?
I think that you really are the first one to report, so nobody has
ever needed such functionalities yet. In fact, I searched mail
archives and there was nothing relevant for PAE.
^ permalink raw reply [flat|nested] 10+ messages in thread
* Re: [Qemu-devel] About QEMU debugging console
@ 2010-10-28 2:20 ` Zhiyuan Shao
2010-10-28 10:59 ` Kevin Wolf
0 siblings, 1 reply; 10+ messages in thread
From: Zhiyuan Shao @ 2010-10-28 2:20 UTC (permalink / raw)
To: Blue Swirl; +Cc: qemu-devel
On Wed, 2010-10-27 at 20:07 +0000, Blue Swirl wrote:
> On Wed, Oct 27, 2010 at 1:10 AM, Zhiyuan Shao <zyshao@mail.hust.edu.cn> wrote:
> > On Tue, 2010-10-26 at 18:59 +0000, Blue Swirl wrote:
> >> On Tue, Oct 26, 2010 at 12:22 PM, Zhiyuan Shao <zyshao@hust.edu.cn> 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. 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.
> >>
> >> How is that bad?
> >>
> > I booted a Linux OS (i386 with PAE support), and has following
> > virtual-to-physical mappings:
> > [0xff00-0000,0xffbf-ffff] -> [0x0000-0000, 0x00bf-ffff]
> > [0x0000-0000,0x00ff-ffff] -> [0x0000-0000, 0x00ff-ffff]
> >
> > while now, with "info mem" command of Qemu debugging console, the output
> > is like:
> > (qemu) info mem
> > 00000000-00400000 00400000 -r-
> > 00c00000-00c08000 00008000 -rw
> > 00c08000-00c09000 00001000 ur-
> > 00c09000-00c0a000 00001000 urw
> > 00c0e000-00c0f000 00001000 urw
> > 00c10000-00c11000 00001000 -r-
> > 00c11000-00c12000 00001000 ur-
> > 00c12000-00c13000 00001000 -r-
> > 00c14000-00c16000 00002000 -r-
> > 00c1b000-00c1e000 00003000 -rw
> > 00c20000-00c40000 00020000 -rw
> > 00c40000-00c41000 00001000 -r-
> > 00c41000-00c42000 00001000 ur-
> > 00c42000-00c43000 00001000 -rw
> > 00c44000-00c60000 0001c000 -rw
> > 00c67000-00c70000 00009000 -rw
> > 00c71000-00c74000 00003000 ur-
> > 00c75000-00c76000 00001000 urw
> > 00c77000-00c78000 00001000 ur-
> > 00c78000-00c79000 00001000 -rw
> > 00c7a000-00d00000 00086000 -rw
> > 00d18000-00d19000 00001000 urw
> > 00d19000-00d1a000 00001000 -rw
> > 00d1d000-00d1e000 00001000 -r-
> > 00d22000-00d23000 00001000 -r-
> > 00d2a000-00d2b000 00001000 -rw
> > 00df0000-00df1000 00001000 -r-
> > 00df1000-00df2000 00001000 urw
> > 00df4000-00df5000 00001000 -r-
> > 00df5000-00df6000 00001000 urw
> > 00df7000-00df8000 00001000 urw
> > 01000000-01400000 00400000 -rw
> > 01400000-01800000 00400000 -r-
> > 01800000-01c00000 00400000 urw
> > 01c00000-02000000 00400000 -rw
> > 04c00000-05000000 00400000 ur-
> > 05c00000-06000000 00400000 -rw
> > 0bc00000-0c000000 00400000 -r-
> > 0c800000-0cc00000 00400000 urw
> > 0d800000-0e000000 00800000 ur-
> > 0e400000-0e800000 00400000 ur-
> > 10400000-10800000 00400000 -rw
> > 12000000-12001000 00001000 -rw
> > 12002000-12003000 00001000 -rw
> > 12004000-12005000 00001000 -rw
> > 12006000-12007000 00001000 -rw
> > 12008000-12009000 00001000 -rw
> > 1200a000-1200b000 00001000 -rw
> > 1200c000-1200d000 00001000 -rw
> > 1200e000-1200f000 00001000 -rw
> > 13bf0000-13bf1000 00001000 -rw
> > 13bf2000-13bf3000 00001000 -rw
> > 13bf4000-13bf5000 00001000 -rw
> > 13bf6000-13bf7000 00001000 -rw
> > 13bf8000-13bf9000 00001000 -rw
> > 13bfa000-13bfb000 00001000 -rw
> >
> > Donot know what the "active virtual memory mappings" means for "info
> > mem" command, but the results displayed is not very likely being
> > correct.
> >
> > While with "info tlb" command:
> >
> > (qemu) info tlb
> > 00000000: 15c00000 -PDA-T--
> > 00c00000: f000f000 G-D-C--W
> > 00c01000: f000f000 G-D-C--W
> > 00c02000: f000e000 --D----W
> > 00c03000: f000f000 G-D-C--W
> > 00c04000: f000f000 G-D-C--W
> > 00c05000: f000f000 G-D-C--W
> > 00c06000: f000f000 G-D-C--W
> > 00c07000: f000f000 G-D-C--W
> > 00c08000: f000f000 ---A--U-
> > 00c09000: f000e000 G-----UW
> > 00c0e000: f000e000 G-D-C-UW
> > 00c10000: c0008000 G--ACT--
> > 00c11000: f000f000 --D--TU-
> > 00c12000: f000f000 --D-----
> > 00c14000: f000e000 G--ACT--
> > 00c15000: f000f000 --D-CT--
> > 00c1b000: f000f000 G-D-C--W
> > 00c1c000: f000f000 G-D-C--W
> > 00c1d000: f000f000 G-D-C--W
> > 00c20000: f000f000 G-D-C--W
> > 00c21000: f000f000 G-D-C--W
> > 00c22000: f000f000 G-D-C--W
> > 00c23000: f000f000 G-D-C--W
> > 00c24000: f000f000 G-D-C--W
> > 00c25000: f000f000 G-D-C--W
> > 00c26000: f000f000 G-D-C--W
> > 00c27000: f000f000 G-D-C--W
> > 00c28000: f000f000 G-D-C--W
> > 00c29000: f000f000 G-D-C--W
> > 00c2a000: f000f000 G-D-C--W
> > 00c2b000: f000f000 G-D-C--W
> > 00c2c000: f000f000 G-D-C--W
> > 00c2d000: f000f000 G-D-C--W
> > 00c2e000: f000f000 G-D-C--W
> > 00c2f000: f000f000 G-D-C--W
> > 00c30000: f000f000 G-D-C--W
> > 00c31000: f000f000 G-D-C--W
> > 00c32000: f000f000 G-D-C--W
> > 00c33000: f000f000 G-D-C--W
> > 00c34000: f000f000 G-D-C--W
> > 00c35000: f000f000 G-D-C--W
> > 00c36000: f000f000 G-D-C--W
> > 00c37000: f000f000 G-D-C--W
> > 00c38000: f000f000 G-D-C--W
> > 00c39000: f000f000 G-D-C--W
> > 00c3a000: f000f000 G-D-C--W
> > 00c3b000: f000f000 G-D-C--W
> > 00c3c000: f000f000 G-D-C--W
> > 00c3d000: f000f000 G-D-C--W
> > 00c3e000: f000f000 G-D-C--W
> > 00c3f000: f000f000 G-D-C--W
> > 00c40000: f000e000 --D-CT--
> > 00c41000: 9fc00000 ---ACTU-
> > 00c42000: f000f000 G-D-C--W
> > 00c44000: f000f000 G-D-C--W
> > 00c45000: f000f000 G-D-C--W
> > 00c46000: f000f000 G-D-C--W
> > 00c47000: f000f000 G-D-C--W
> > 00c48000: f000f000 G-D-C--W
> > 00c49000: f000f000 G-D-C--W
> > 00c4a000: f000f000 G-D-C--W
> > 00c4b000: f000f000 G-D-C--W
> > 00c4c000: f000f000 G-D-C--W
> > 00c4d000: f000f000 G-D-C--W
> > 00c4e000: f000f000 G-D-C--W
> > 00c4f000: f000f000 G-D-C--W
> > 00c50000: f000f000 G-D-C--W
> > 00c51000: f000f000 G-D-C--W
> > 00c52000: f000f000 G-D-C--W
> > 00c53000: f000f000 G-D-C--W
> > 00c54000: f000f000 G-D-C--W
> > 00c55000: f000f000 G-D-C--W
> > 00c56000: f000f000 G-D-C--W
> > 00c57000: f000f000 G-D-C--W
> > 00c58000: f000f000 G-D-C--W
> > 00c59000: f000f000 G-D-C--W
> > 00c5a000: f000f000 G-D-C--W
> > 00c5b000: f000f000 G-D-C--W
> > 00c5c000: f000f000 G-D-C--W
> > 00c5d000: f000f000 G-D-C--W
> > 00c5e000: f000f000 G-D-C--W
> > 00c5f000: f000f000 G-D-C--W
> > 00c67000: f000f000 G-D-C--W
> > 00c68000: f000f000 G-D-C--W
> > 00c69000: f000f000 G-D-C--W
> > 00c6a000: f000f000 G-D-C--W
> > 00c6b000: f000f000 G-D-C--W
> > 00c6c000: f000f000 G-D-C--W
> > 00c6d000: f000f000 G-D-C--W
> > 00c6e000: f000f000 G-D-C--W
> > 00c6f000: f000f000 G-D-C--W
> > 00c71000: f000f000 G-D---U-
> > 00c72000: f000f000 G-D---U-
> > 00c73000: f000f000 G-D---U-
> > 00c75000: f000e000 --DA--UW
> > 00c77000: f000f000 G-D---U-
> > 00c78000: f000f000 G-D-C--W
> > 00c7a000: f000f000 G-D-C--W
> > 00c7b000: f000f000 G-D-C--W
> > 00c7c000: f000f000 G-D-C--W
> > 00c7d000: f000f000 G-D-C--W
> > 00c7e000: f000f000 G-D-C--W
> > 00c7f000: f000f000 G-D-C--W
> > 00c80000: f000f000 G-D-C--W
> > 00c81000: f000f000 G-D-C--W
> > 00c82000: f000f000 G-D-C--W
> > 00c83000: f000f000 G-D-C--W
> > 00c84000: f000f000 G-D-C--W
> > 00c85000: f000f000 G-D-C--W
> > 00c86000: f000f000 G-D-C--W
> > 00c87000: f000f000 G-D-C--W
> > 00c88000: f000f000 G-D-C--W
> > 00c89000: f000f000 G-D-C--W
> > 00c8a000: f000f000 G-D-C--W
> > 00c8b000: f000f000 G-D-C--W
> > 00c8c000: f000f000 G-D-C--W
> > 00c8d000: f000f000 G-D-C--W
> > 00c8e000: f000f000 G-D-C--W
> > 00c8f000: f000f000 G-D-C--W
> > 00c90000: f000f000 G-D-C--W
> > 00c91000: f000f000 G-D-C--W
> > 00c92000: f000f000 G-D-C--W
> > 00c93000: f000f000 G-D-C--W
> > 00c94000: f000f000 G-D-C--W
> > 00c95000: f000f000 G-D-C--W
> > 00c96000: f000f000 G-D-C--W
> > 00c97000: f000f000 G-D-C--W
> > 00c98000: f000f000 G-D-C--W
> > 00c99000: f000f000 G-D-C--W
> > 00c9a000: f000f000 G-D-C--W
> > 00c9b000: f000f000 G-D-C--W
> > 00c9c000: f000f000 G-D-C--W
> > 00c9d000: f000f000 G-D-C--W
> > 00c9e000: f000f000 G-D-C--W
> > 00c9f000: f000f000 G-D-C--W
> > 00ca0000: f000f000 G-D-C--W
> > 00ca1000: f000f000 G-D-C--W
> > 00ca2000: f000f000 G-D-C--W
> > 00ca3000: f000f000 G-D-C--W
> > 00ca4000: f000f000 G-D-C--W
> > 00ca5000: f000f000 G-D-C--W
> > 00ca6000: f000f000 G-D-C--W
> > 00ca7000: f000f000 G-D-C--W
> > 00ca8000: f000f000 G-D-C--W
> > 00ca9000: f000f000 G-D-C--W
> > 00caa000: f000f000 G-D-C--W
> > 00cab000: f000f000 G-D-C--W
> > 00cac000: f000f000 G-D-C--W
> > 00cad000: f000f000 G-D-C--W
> > 00cae000: f000f000 G-D-C--W
> > 00caf000: f000f000 G-D-C--W
> > 00cb0000: f000f000 G-D-C--W
> > 00cb1000: f000f000 G-D-C--W
> > 00cb2000: f000f000 G-D-C--W
> > 00cb3000: f000f000 G-D-C--W
> > 00cb4000: f000f000 G-D-C--W
> > 00cb5000: f000f000 G-D-C--W
> > 00cb6000: f000f000 G-D-C--W
> > 00cb7000: f000f000 G-D-C--W
> > 00cb8000: f000f000 G-D-C--W
> > 00cb9000: f000f000 G-D-C--W
> > 00cba000: f000f000 G-D-C--W
> > 00cbb000: f000f000 G-D-C--W
> > 00cbc000: f000f000 G-D-C--W
> > 00cbd000: f000f000 G-D-C--W
> > 00cbe000: f000f000 G-D-C--W
> > 00cbf000: f000f000 G-D-C--W
> > 00cc0000: f000f000 G-D-C--W
> > 00cc1000: f000f000 G-D-C--W
> > 00cc2000: f000f000 G-D-C--W
> > 00cc3000: f000f000 G-D-C--W
> > 00cc4000: f000f000 G-D-C--W
> > 00cc5000: f000f000 G-D-C--W
> > 00cc6000: f000f000 G-D-C--W
> > 00cc7000: f000f000 G-D-C--W
> > 00cc8000: f000f000 G-D-C--W
> > 00cc9000: f000f000 G-D-C--W
> > 00cca000: f000f000 G-D-C--W
> > 00ccb000: f000f000 G-D-C--W
> > 00ccc000: f000f000 G-D-C--W
> > 00ccd000: f000f000 G-D-C--W
> > 00cce000: f000f000 G-D-C--W
> > 00ccf000: f000f000 G-D-C--W
> > 00cd0000: f000f000 G-D-C--W
> > 00cd1000: f000f000 G-D-C--W
> > 00cd2000: f000f000 G-D-C--W
> > 00cd3000: f000f000 G-D-C--W
> > 00cd4000: f000f000 G-D-C--W
> > 00cd5000: f000f000 G-D-C--W
> > 00cd6000: f000f000 G-D-C--W
> > 00cd7000: f000f000 G-D-C--W
> > 00cd8000: f000f000 G-D-C--W
> > 00cd9000: f000f000 G-D-C--W
> > 00cda000: f000f000 G-D-C--W
> > 00cdb000: f000f000 G-D-C--W
> > 00cdc000: f000f000 G-D-C--W
> > 00cdd000: f000f000 G-D-C--W
> > 00cde000: f000f000 G-D-C--W
> > 00cdf000: f000f000 G-D-C--W
> > 00ce0000: f000f000 G-D-C--W
> > 00ce1000: f000f000 G-D-C--W
> > 00ce2000: f000f000 G-D-C--W
> > 00ce3000: f000f000 G-D-C--W
> > 00ce4000: f000f000 G-D-C--W
> > 00ce5000: f000f000 G-D-C--W
> > 00ce6000: f000f000 G-D-C--W
> > 00ce7000: f000f000 G-D-C--W
> > 00ce8000: f000f000 G-D-C--W
> > 00ce9000: f000f000 G-D-C--W
> > 00cea000: f000f000 G-D-C--W
> > 00ceb000: f000f000 G-D-C--W
> > 00cec000: f000f000 G-D-C--W
> > 00ced000: f000f000 G-D-C--W
> > 00cee000: f000f000 G-D-C--W
> > 00cef000: f000f000 G-D-C--W
> > 00cf0000: f000f000 G-D-C--W
> > 00cf1000: f000f000 G-D-C--W
> > 00cf2000: f000f000 G-D-C--W
> > 00cf3000: f000f000 G-D-C--W
> > 00cf4000: f000f000 G-D-C--W
> > 00cf5000: f000f000 G-D-C--W
> > 00cf6000: f000f000 G-D-C--W
> > 00cf7000: f000f000 G-D-C--W
> > 00cf8000: f000f000 G-D-C--W
> > 00cf9000: f000f000 G-D-C--W
> > 00cfa000: f000f000 G-D-C--W
> > 00cfb000: f000f000 G-D-C--W
> > 00cfc000: f000f000 G-D-C--W
> > 00cfd000: f000f000 G-D-C--W
> > 00cfe000: f000f000 G-D-C--W
> > 00cff000: f000f000 G-D-C--W
> > 00d18000: d4000000 ------UW
> > 00d19000: 00000000 -------W
> > 00d1d000: 00c00000 G-------
> > 00d22000: 00085000 G-DACT--
> > 00d2a000: c0003000 G--A---W
> > 00df0000: fe830000 --------
> > 00df1000: 003f7000 G-DACTUW
> > 00df4000: fe827000 --D-----
> > 00df5000: a87cb000 --DACTUW
> > 00df7000: 00000000 -----TUW
> > 01000000: e4500000 GPDACT-W
> > 01400000: 24500000 -P-A----
> > 01800000: e0200000 GPDACTUW
> > 01c00000: 00e00000 GP---T-W
> > 04c00000: b8a00000 GP---TU-
> > 05c00000: e2000000 GP-----W
> > 0bc00000: 75f00000 GP---T--
> > 0c800000: 13e00000 -PDACTUW
> > 0d800000: 90f00000 GPDA--U-
> > 0dc00000: 00200000 -P---TU-
> > 0e400000: 00000000 -P---TU-
> > 10400000: 90900000 -PDA-T-W
> > 12000000: 002a8000 --DA---W
> > 12002000: 00200000 --DA---W
> > 12004000: 00400000 --DA---W
> > 12006000: 00600000 --DA---W
> > 12008000: 00800000 --DA---W
> > 1200a000: 00a00000 --DA---W
> > 1200c000: 00c00000 --DA---W
> > 1200e000: 00e00000 --DA---W
> > 13bf0000: 002a8000 --DA---W
> > 13bf2000: 00200000 --DA---W
> > 13bf4000: 00400000 --DA---W
> > 13bf6000: 00600000 --DA---W
> > 13bf8000: 00800000 --DA---W
> > 13bfa000: 00a00000 --DA---W
> > (qemu)
> >
> > Is here someone can explain such output?
>
> The output is generated in monitor.c:1812:1926. The functions use only
> uint32_t, so I suppose PAE support has not been added.
>
> >> > 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?
> >>
> >> Perhaps nobody were aware that there were any lack of functionalities.
> >> I think these should be very easy to add.
> >>
> >
> > This should be not so hard, and I may have a try in the close future.
> > The difficulty here is that you have to consider several paging
> > techniques invented by Intel, such as, i386, PAE, PSE(36), x86_64. And
> > these works ONLY for the i386 platform.
> >
> > I just wondering: It is for sure that I am not the very first person who
> > encounter such problems in the history of Qemu development. Why these
> > simple functionalities were not added to the main release till now?
>
> I think that you really are the first one to report, so nobody has
> ever needed such functionalities yet. In fact, I searched mail
> archives and there was nothing relevant for PAE.
>
OK, If I get some time in the close future, I will try to improve the
relevant part (todo list: PAE/PSE(36), IDT, GDT, x86_64, possibly
pipe-like feature) of Qemu that I think it will be helpful for people
debugging code on the i386 platform.
Anyway, are such improvements interested in Qemu community? If so, I
will submit the code patch I made based on 0.13.0 to this list. Do hope
later version of Qemu supports these.
^ permalink raw reply [flat|nested] 10+ messages in thread
* Re: [Qemu-devel] About QEMU debugging console
2010-10-28 2:20 ` Zhiyuan Shao
@ 2010-10-28 10:59 ` Kevin Wolf
0 siblings, 0 replies; 10+ messages in thread
From: Kevin Wolf @ 2010-10-28 10:59 UTC (permalink / raw)
To: Zhiyuan Shao; +Cc: Blue Swirl, qemu-devel
Am 28.10.2010 04:20, schrieb Zhiyuan Shao:
> OK, If I get some time in the close future, I will try to improve the
> relevant part (todo list: PAE/PSE(36), IDT, GDT, x86_64, possibly
> pipe-like feature) of Qemu that I think it will be helpful for people
> debugging code on the i386 platform.
>
> Anyway, are such improvements interested in Qemu community? If so, I
> will submit the code patch I made based on 0.13.0 to this list. Do hope
> later version of Qemu supports these.
Yes, definitely. You can always work around it, e.g. by directly
inspecting memory, so I didn't care enough to implement it, but having
it seems certainly convenient.
Kevin
^ permalink raw reply [flat|nested] 10+ messages in thread
* [Qemu-devel] Re: About QEMU debugging console
2010-10-26 12:22 ` Zhiyuan Shao
2010-10-26 18:59 ` Blue Swirl
@ 2010-10-28 12:36 ` Jan Kiszka
2010-10-29 2:41 ` Zhiyuan Shao
1 sibling, 1 reply; 10+ messages in thread
From: Jan Kiszka @ 2010-10-28 12:36 UTC (permalink / raw)
To: Zhiyuan Shao; +Cc: qemu-devel
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?
> 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.
Jan
--
Siemens AG, Corporate Technology, CT T DE IT 1
Corporate Competence Center Embedded Linux
^ permalink raw reply [flat|nested] 10+ messages in thread
* Re: [Qemu-devel] Re: About QEMU debugging console
@ 2010-10-29 2:41 ` Zhiyuan Shao
0 siblings, 0 replies; 10+ messages in thread
From: Zhiyuan Shao @ 2010-10-29 2:41 UTC (permalink / raw)
To: Jan Kiszka; +Cc: Zhiyuan Shao, qemu-devel
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
^ permalink raw reply [flat|nested] 10+ messages in thread
* Re: [Qemu-devel] Re: About QEMU debugging console
@ 2010-10-29 7:32 ` Jan Kiszka
2010-10-31 10:49 ` Andreas Färber
0 siblings, 1 reply; 10+ messages in thread
From: Jan Kiszka @ 2010-10-29 7:32 UTC (permalink / raw)
To: Zhiyuan Shao; +Cc: Zhiyuan Shao, qemu-devel
Am 29.10.2010 04:41, Zhiyuan Shao wrote:
> 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?
More the latter: The full register set (including MSRs) need to be made
available to gdb via the remote protocol, and gdb has to be taught
interpreting it. This is e.g. required to understand the current
operating mode (16/32/64 bit) and legacy segmentation.
Moreover, once you have access to the control registers (and some MSRs),
you can easily parse and dump the page table hierarchy in gdb extension
scripts (preferably in Python these days). That's way better than
overloading QEMU with more of such things.
>
> 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.
For sure. But the major issue is more about resources to work on this
than gdb community support. Browse their mailing list archive to find
that they are actually supportive regarding this topic.
Jan
--
Siemens AG, Corporate Technology, CT T DE IT 1
Corporate Competence Center Embedded Linux
^ permalink raw reply [flat|nested] 10+ messages in thread
* Re: [Qemu-devel] Re: About QEMU debugging console
2010-10-29 7:32 ` Jan Kiszka
@ 2010-10-31 10:49 ` Andreas Färber
0 siblings, 0 replies; 10+ messages in thread
From: Andreas Färber @ 2010-10-31 10:49 UTC (permalink / raw)
To: Jan Kiszka; +Cc: Zhiyuan Shao, qemu-devel Developers
Am 29.10.2010 um 09:32 schrieb Jan Kiszka:
> Am 29.10.2010 04:41, Zhiyuan Shao wrote:
>> On Thu, 2010-10-28 at 14:36 +0200, Jan Kiszka wrote:
>>> 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?
>
> More the latter: The full register set (including MSRs) need to be
> made
> available to gdb via the remote protocol, and gdb has to be taught
> interpreting it. This is e.g. required to understand the current
> operating mode (16/32/64 bit) and legacy segmentation.
[...]
>> 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.
>
> For sure. But the major issue is more about resources to work on this
> than gdb community support. Browse their mailing list archive to find
> that they are actually supportive regarding this topic.
Since this seems a recurring topic, maybe you should put this onto the
GSoC ideas list?
Regards,
Andreas
^ permalink raw reply [flat|nested] 10+ messages in thread
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2010-10-26 12:22 [Qemu-devel] About QEMU debugging console Zhiyuan Shao
2010-10-26 12:22 ` Zhiyuan Shao
2010-10-26 18:59 ` Blue Swirl
2010-10-27 1:10 ` Zhiyuan Shao
2010-10-27 1:10 ` Zhiyuan Shao
2010-10-27 20:07 ` Blue Swirl
2010-10-28 2:20 ` Zhiyuan Shao
2010-10-28 2:20 ` Zhiyuan Shao
2010-10-28 10:59 ` Kevin Wolf
2010-10-28 12:36 ` [Qemu-devel] " Jan Kiszka
2010-10-29 2:41 ` Zhiyuan Shao
2010-10-29 2:41 ` Zhiyuan Shao
2010-10-29 7:32 ` Jan Kiszka
2010-10-31 10:49 ` Andreas Färber
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