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/usr/include/machine/reg.h header file to determine where registers
are stored in the exception frame.
The savedefp variable contains the location of the exception frame. (Note
that no exception frames are created when you force a system to dump, as
described in the
System Administration manual.) The following example
shows an example exception frame:
(dbx) print savedefp/33X
ffffffff9618d940: 0000000000000000 fffffc000046f888
ffffffff9618d950: ffffffff86329ed0 0000000079cd612f
ffffffff9618d960: 000000000000007d 0000000000000001
ffffffff9618d970: 0000000000000000 fffffc000046f4e0
ffffffff9618d980: 0000000000000000 ffffffff9618a2f8
ffffffff9618d990: 0000000140012b20 0000000000000000
ffffffff9618d9a0: 000000014002ee10 0000000000000000
ffffffff9618d9b0: 00000001400075e8 0000000140026240
ffffffff9618d9c0: ffffffff9618daf0 ffffffff8635af20
ffffffff9618d9d0: ffffffff9618dac0 00000000000001b0
ffffffff9618d9e0: fffffc00004941b8 0000000000000000
ffffffff9618d9f0: 0000000000000001 fffffc000028951c
ffffffff9618da00: 0000000000000000 0000000000000fff
ffffffff9618da10: 0000000140026240 0000000000000000
ffffffff9618da20: 0000000000000000 fffffc000047acd0
ffffffff9618da30: 0000000000901402 0000000000001001
ffffffff9618da40: 0000000000002000
2.1.9 Examining the User Program Stack
When debugging a crash dump with dbx, you can examine the call stack of
the user program whose execution precipitated the kernel crash. To examine
a crash dump and also view the user program stack, you must invoke dbx
using the following command syntax:
dbx -k vmunix.n vm[z]core.n path/user-program
The version number (n) is determined by the value contained in the
bounds file, which is located in the same directory as the dump files. The
user-program parameter specifies the user program executable.
The crash dump file must contain a full crash dump. For information on
setting system defaults for full or partial crash dumps, see the System
Administration manual. You can use the assign command in dbx, as shown
in the following example, to temporarily specify a full crash dump. This
setting stays in effect until the system is rebooted.
# dbx -k vmunix.3
dbx version 5.0
.
.
.
(dbx) assign partial_dump=0
2–8 Kernel Debugging Utilities