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Oracle® Solaris Modular Debugger Guide

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Updated: October 2019
 
 

Crash Functions and MDB Dcmds

crash function
mdb dcmd
Comments
?
::dcmds
List available functions.
!command
!command
Escape to the shell and execute command.
base
=
In mdb, the = format character can be used to convert the left-hand expression value to any of the known formats. Formats for octal, decimal, and hexadecimal are provided.
callout
::callout
Print the callout table.
class
::class
Print scheduling classes.
cpu
::cpuinfo
Print information about the threads dispatched on the system CPUs. If the contents of a particular CPU structure are needed, the user should apply the $<cpu macro to the CPU address in mdb.
help
::help
Print a description of the named dcmd, or general help information.
kfp
::regs
The mdb ::regs dcmd displays the complete kernel register set, including the current stack frame pointer. The $C dcmd can be used to display a stack backtrace including frame pointers.
kmalog
::kmalog
Display events in kernel memory allocator transaction log.
kmastat
::kmastat
Print kernel memory allocator transaction log.
kmausers
::kmausers
Print information about the medium and large users of the kernel memory allocator that have current memory allocations.
mount
::fsinfo
Print information about mounted file systems.
nm
::nm
Print symbol type and value information.
od
::dump
Print a formatted memory dump of a given region. In mdb, ::dump displays a mixed ASCII and hexadecimal display of the region.
proc
::ps
Print a table of the active processes.
quit
::quit
Quit the debugger.
rd
::dump
Print a formatted memory dump of a given region. In mdb, ::dump displays a mixed ASCII and hexadecimal display of the region.
redirect
::log
In mdb, output for input and output can be globally redirected to a log file using ::log.
search
::kgrep
In mdb, the ::kgrep dcmd can be used to search the kernel's address space for a particular value. The pattern match built-in dcmds can also be used to search the physical, virtual, or object files address spaces for patterns.
stack
::stack
The current stack trace can be obtained using ::stack. The stack trace of a particular kernel thread can be determined using the ::findstack dcmd. A memory dump of the current stack can be obtained using the / or ::dump dcmds and the current stack pointer. The $<stackregs macro can be applied to a stack pointer to obtain the per-frame saved register values.
status
::status
Display status information about the system or dump being examined by the debugger.
stream
::stream
The mdb ::stream dcmd can be used to format and display the structure of a particular kernel STREAM. If the list of active STREAM structures is needed, the user should execute ::walk stream_head_cache in mdb and pipe the resulting addresses to an appropriate formatting dcmd or macro.
strstat
::kmastat
The ::kmastat dcmd displays a superset of the information reported by the strstat function.
trace
::stack
The current stack trace can be obtained using ::stack. The stack trace of a particular kernel thread can be determined using the ::findstack dcmd. A memory dump of the current stack can be obtained using the / or ::dump dcmds and the current stack pointer. The $<stackregs macro can be applied to a stack pointer to obtain the per-frame saved register values.
var
$<v
Print the tunable system parameters in the global var structure.
vfs
::fsinfo
Print information about mounted file systems.
vtop
::vtop
Print the physical address translation of the given virtual address.