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[Xen-devel] [PATCH] domu_debug README

  • To: xen-devel@xxxxxxxxxxxxxxxxxxx
  • From: Kip Macy <kmacy@xxxxxxxxxx>
  • Date: Wed, 18 May 2005 11:08:33 -0700 (PDT)
  • Delivery-date: Wed, 18 May 2005 18:08:03 +0000
  • List-id: Xen developer discussion <xen-devel.lists.xensource.com>

After fielding yet another question about the debugger I've accepted that a 
minimal readme is in order.


# This is a BitKeeper generated diff -Nru style patch.
# ChangeSet
#   2005/05/18 11:05:39-07:00 kmacy@xxxxxxxxxxxxxxxxxxxxxx 
#   add readme for domu_debug
#   Signed-off-by: Kip Macy <kmacy@xxxxxxxxxxx>
# BitKeeper/etc/logging_ok
#   2005/05/18 11:05:39-07:00 kmacy@xxxxxxxxxxxxxxxxxxxxxx +1 -0
#   Logging to logging@xxxxxxxxxxxxxxx accepted
# docs/misc/domu_debug.txt
#   2005/05/18 11:05:30-07:00 kmacy@xxxxxxxxxxxxxxxxxxxxxx +40 -0
# docs/misc/domu_debug.txt
#   2005/05/18 11:05:30-07:00 kmacy@xxxxxxxxxxxxxxxxxxxxxx +0 -0
#   BitKeeper file 
diff -Nru a/docs/misc/domu_debug.txt b/docs/misc/domu_debug.txt
--- /dev/null   Wed Dec 31 16:00:00 196900
+++ b/docs/misc/domu_debug.txt  2005-05-17 11:11:14 -07:00
@@ -0,0 +1,40 @@
+For the moment xen must be re-built with domu_debug enabled in Rules.mk. The 
+user-level stub gdbserver-xen is created by running gdbbuild in tools/gdb. The
+gdbbuild script currently assumes that bitkeeper installed.
+In domain 0, run as root
+> gdbserver-xen <name/ip-address>:<port> --attach <domid>
+my current dev box is curly and the new domain id is 1, so:
+> sudo gdbserver-xen curly:2345 --attach 1
+this will pause the domain until the gdb client tells it to continue.
+Either in domain 0 or on a separate machine run (unmodified) gdb:
+> gdb <symbol-file>
+so when debugging FreeBSD it is,
+> gdb kernel.debug
+GNU gdb 6.2
+Copyright 2004 Free Software Foundation, Inc.
+GDB is free software, covered by the GNU General Public License, and you are
+welcome to change it and/or distribute copies of it under certain conditions.
+Type "show copying" to see the conditions.
+There is absolutely no warranty for GDB.  Type "show warranty" for details.
+This GDB was configured as "i386-unknown-freebsd5.2.1"...
+(gdb)  target remote curly:2345
+This will show you the line of code where it stopped.
+GDB will expect the path to the source to be the same as when you
+built the kernel, let me know if that isn't the case.
+'b <line>' will set a breakpoint at line in the current file
+'b <file>:<line>' will set a breakpoint in the specified file at the
+specified line
+'c' will continue
+'c n' will continue through the next n breakpoints
+'s' will single step
+'i r' will dump the registers
+'set $eax=5' will set eax to 5
+'p variable' will print the value of variable if it is in scope
+'i line *addr' will tell you what line of source code addr corresponds to
+'x/i addr' will decode the instruction at addr
+'x/10i addr' will decode 10 instructions starting at addr
\ No newline at end of file

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