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Diff for /wikisrc/kernel_debugging_with_qemu.mdwn between versions 1.8 and 1.9

version 1.8, 2015/02/19 08:32:23 version 1.9, 2015/02/19 09:37:14
Line 61  Install the system in a virtual machine, Line 61  Install the system in a virtual machine,
 ## Booting the VMs  ## Booting the VMs
   
 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
Line 69  hard disk image.  This sharing is made p Line 69  hard disk image.  This sharing is made p
 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 80  If you don't want everyone on the Intern Line 80  If you don't want everyone on the Intern
 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
 """]]  """]]
   
 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
 """]]  """]]
   
 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 101  Start gdb on the kgdb host and connect t Line 101  Start gdb on the kgdb host and connect t
 """]]  """]]
   
 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.
   
 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:
Removed from v.1.8  
changed lines
  Added in v.1.9

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