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version 1.6, 2015/02/18 16:03:37
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version 1.12, 2015/08/05 12:58:13
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Line 9 You need a computer running an OS capabl
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Line 9 You need a computer running an OS capabl
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| (the "host system"). |
(the "host system"). |
| This can be NetBSD itself, Linux, or some other Unix-like OS. |
This can be NetBSD itself, Linux, or some other Unix-like OS. |
| These instructions have been tested with NetBSD/amd64 6.1.4 and |
These instructions have been tested with NetBSD/amd64 6.1.4 and |
| Debian 7 hosts. |
Debian 7 hosts. There should be at least 20 gigabytes of available |
| |
disk space. |
| |
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| If your host system is running NetBSD, install the following packages |
If your host system is running NetBSD, install the following packages |
| from pkgsrc: |
from pkgsrc: |
|
Line 25 install the most recent anita package fr
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Line 26 install the most recent anita package fr
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| ## Building the target system |
## Building the target system |
| |
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| Check out the NetBSD-current sources from CVS and build a full |
Check out the NetBSD-current sources from CVS and build a full release |
| NetBSD-current/i386 release with debug symbols using the build.sh |
of NetBSD-current/i386 with debug symbols using the build.sh script. |
| script. The i386 port is the preferred test platform because the two |
The i386 port is the preferred test platform because the two |
| other ports supported by anita are affected by known bugs: amd64 by |
other ports supported by anita are affected by known bugs: amd64 by |
| [[PR 49276|http://gnats.NetBSD.org/49276]], and sparc by |
[[PR 50128|http://gnats.NetBSD.org/50128]], and sparc by |
| [[qemu bug 1335444|https://bugs.launchpad.net/qemu/+bug/1335444]]. |
[[qemu bug 1399943|https://bugs.launchpad.net/qemu/+bug/1399943]]. |
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| If you do the build in a directory other than /usr/src, |
If you do the build in a directory other than /usr/src, |
| use the -fdebug-prefix-map option to ensure that the source file names embedded |
use the -fdebug-prefix-map option to ensure that the source file names embedded |
| in the debug symbols point to /usr/src, which is where the sources will be |
in the debug symbols point to /usr/src, which is where the sources will be |
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Line 60 Install the system in a virtual machine,
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Line 60 Install the system in a virtual machine,
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| ## Booting the VMs |
## Booting the VMs |
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| Next, start two qemu virtual machines, one to run the kernel being |
Next, start two qemu virtual machines, one to run the kernel being |
| debugged (the "kgdb target") and another to run gdb (the "kgdb host"). |
debugged (the "target VM") and another to run gdb (the "gdb VM"). |
| |
|
| The two VMS could be run on separate physical machines, but in this |
The two VMs could be run on separate physical machines, but in this |
| example, they are run on the same physical machine and share the same |
example, they are run on the same physical machine and share the same |
| hard disk image. This sharing is made possible by the "-snapshot" |
hard disk image. This sharing is made possible by the "-snapshot" |
| option to qemu, which ensures that the disk image is not written to by |
option to qemu, which ensures that the disk image is not written to by |
| either VM. |
either VM. |
| |
|
| First start the kgdb target, enabling qemu's built-in GDB target stub |
First start the target VM, enabling qemu's built-in GDB target stub |
| on TCP port 1234: |
on TCP port 1234: |
| |
|
| [[!template id=programlisting text=""" |
[[!template id=programlisting text=""" |
|
Line 79 If you don't want everyone on the Intern
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Line 79 If you don't want everyone on the Intern
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| target, make sure incoming connections on port 1234 are blocked in |
target, make sure incoming connections on port 1234 are blocked in |
| your firewall. |
your firewall. |
| |
|
| In a second terminal window, start the kgdb host: |
In a second terminal window, start the gdb VM: |
| |
|
| [[!template id=programlisting text=""" |
[[!template id=programlisting text=""" |
| $ qemu-system-i386 -nographic -snapshot -hda work/wd0.img |
$ qemu-system-i386 -nographic -snapshot -hda work/wd0.img |
| """]] |
"""]] |
| |
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| Log in to the kgdb host as root and set up the network: |
Log in to the gdb VM as root and set up the network: |
| |
|
| [[!template id=programlisting text=""" |
[[!template id=programlisting text=""" |
| login: root |
login: root |
| # dhcpcd |
# dhcpcd |
| """]] |
"""]] |
| |
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| Start gdb on the kgdb host and connect to the target: |
Start gdb on the gdb VM and connect to the target: |
| |
|
| [[!template id=programlisting text=""" |
[[!template id=programlisting text=""" |
| # gdb /netbsd |
# gdb /netbsd |
|
Line 100 Start gdb on the kgdb host and connect t
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Line 100 Start gdb on the kgdb host and connect t
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| """]] |
"""]] |
| |
|
| where my.host.name is the domain name or IP address of the |
where my.host.name is the domain name or IP address of the |
| physical machine running the kgdb target qemu VM. |
host system. |
| |
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| Now you should be able to get a stack trace and start debugging |
Now you should be able to get a stack trace and start debugging |
| with full debug symbols and access to the source code: |
with full debug symbols and access to the source code: |
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