2007-11-27 11:02:41 +00:00
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.\"
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2009-06-24 12:06:15 +00:00
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.\" Copyright (c) 2007-2009 Robert N. M. Watson
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2007-11-27 11:02:41 +00:00
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.\" All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice(s), this list of conditions and the following disclaimer as
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.\" the first lines of this file unmodified other than the possible
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.\" addition of one or more copyright notices.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice(s), this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDER(S) ``AS IS'' AND ANY
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.\" EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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.\" WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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.\" DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) BE LIABLE FOR ANY
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.\" DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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.\" (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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.\" SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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.\" CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
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.\" DAMAGE.
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.\"
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.\" $FreeBSD$
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.\"
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2015-09-11 03:56:04 +00:00
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.Dd September 10, 2015
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2007-11-27 11:02:41 +00:00
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.Dt STACK 9
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.Os
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.Sh NAME
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.Nm stack
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.Nd kernel thread stack tracing routines
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.Sh SYNOPSIS
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2010-04-07 19:13:31 +00:00
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.In sys/param.h
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2007-11-27 11:02:41 +00:00
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.In sys/stack.h
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2015-09-11 03:56:04 +00:00
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|
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.Pp
|
Break out stack(9) from ddb(4):
- Introduce per-architecture stack_machdep.c to hold stack_save(9).
- Introduce per-architecture machine/stack.h to capture any common
definitions required between db_trace.c and stack_machdep.c.
- Add new kernel option "options STACK"; we will build in stack(9) if it is
defined, or also if "options DDB" is defined to provide compatibility
with existing users of stack(9).
Add new stack_save_td(9) function, which allows the capture of a stacktrace
of another thread rather than the current thread, which the existing
stack_save(9) was limited to. It requires that the thread be neither
swapped out nor running, which is the responsibility of the consumer to
enforce.
Update stack(9) man page.
Build tested: amd64, arm, i386, ia64, powerpc, sparc64, sun4v
Runtime tested: amd64 (rwatson), arm (cognet), i386 (rwatson)
2007-12-02 20:40:35 +00:00
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|
In the kernel configuration file:
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2007-11-27 11:02:41 +00:00
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.Cd "options DDB"
|
Break out stack(9) from ddb(4):
- Introduce per-architecture stack_machdep.c to hold stack_save(9).
- Introduce per-architecture machine/stack.h to capture any common
definitions required between db_trace.c and stack_machdep.c.
- Add new kernel option "options STACK"; we will build in stack(9) if it is
defined, or also if "options DDB" is defined to provide compatibility
with existing users of stack(9).
Add new stack_save_td(9) function, which allows the capture of a stacktrace
of another thread rather than the current thread, which the existing
stack_save(9) was limited to. It requires that the thread be neither
swapped out nor running, which is the responsibility of the consumer to
enforce.
Update stack(9) man page.
Build tested: amd64, arm, i386, ia64, powerpc, sparc64, sun4v
Runtime tested: amd64 (rwatson), arm (cognet), i386 (rwatson)
2007-12-02 20:40:35 +00:00
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.Cd "options STACK"
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2015-09-11 03:56:04 +00:00
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.Pp
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2007-11-27 11:02:41 +00:00
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.Ft struct stack *
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.Fn stack_create "void"
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.Ft void
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.Fn stack_destroy "struct stack *st"
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.Ft int
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.Fn stack_put "struct stack *st" "vm_offset_t pc"
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.Ft void
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2011-11-16 19:06:55 +00:00
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.Fn stack_copy "const struct stack *src" "struct stack dst"
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2007-11-27 11:02:41 +00:00
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.Ft void
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.Fn stack_zero "struct stack *st"
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.Ft void
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2011-11-16 19:06:55 +00:00
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.Fn stack_print "const struct stack *st"
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2007-11-29 17:16:55 +00:00
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.Ft void
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2011-11-16 19:06:55 +00:00
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.Fn stack_print_ddb "const struct stack *st"
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2008-03-14 13:13:37 +00:00
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.Ft void
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2011-11-16 19:06:55 +00:00
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.Fn stack_print_short "const struct stack *st"
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2009-06-24 12:06:15 +00:00
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.Ft void
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2011-11-16 19:06:55 +00:00
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.Fn stack_print_short_ddb "const struct stack *st"
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2009-06-24 12:06:15 +00:00
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.Ft void
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2011-11-16 19:06:55 +00:00
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.Fn stack_sbuf_print "struct sbuf sb*" "const struct stack *st"
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2007-11-27 11:02:41 +00:00
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.Ft void
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2011-11-16 19:06:55 +00:00
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.Fn stack_sbuf_print_ddb "struct sbuf sb*" "const struct stack *st"
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2007-12-01 22:04:16 +00:00
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.Ft void
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2007-11-27 11:02:41 +00:00
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.Fn stack_save "struct stack *st"
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2015-09-11 03:56:04 +00:00
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.Ft void
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.Fn stack_save_td "struct stack *st" "struct thread *td"
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.Ft int
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.Fn stack_save_td_running "struct stack *st" "struct thread *td"
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2007-11-27 11:02:41 +00:00
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.Sh DESCRIPTION
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The
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.Nm
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KPI allows querying of kernel stack trace information and the automated
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|
generation of kernel stack trace strings for the purposes of debugging and
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tracing.
|
Break out stack(9) from ddb(4):
- Introduce per-architecture stack_machdep.c to hold stack_save(9).
- Introduce per-architecture machine/stack.h to capture any common
definitions required between db_trace.c and stack_machdep.c.
- Add new kernel option "options STACK"; we will build in stack(9) if it is
defined, or also if "options DDB" is defined to provide compatibility
with existing users of stack(9).
Add new stack_save_td(9) function, which allows the capture of a stacktrace
of another thread rather than the current thread, which the existing
stack_save(9) was limited to. It requires that the thread be neither
swapped out nor running, which is the responsibility of the consumer to
enforce.
Update stack(9) man page.
Build tested: amd64, arm, i386, ia64, powerpc, sparc64, sun4v
Runtime tested: amd64 (rwatson), arm (cognet), i386 (rwatson)
2007-12-02 20:40:35 +00:00
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To use the KPI, at least one of
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.Cd "options DDB"
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and
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.Cd "options STACK"
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must be compiled into the kernel.
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2007-11-27 11:02:41 +00:00
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.Pp
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Each stack trace is described by a
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.Vt "struct stack" .
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Before a trace may be created or otherwise manipulated, storage for the trace
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must be allocated with
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.Fn stack_create ,
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which may sleep.
|
Break out stack(9) from ddb(4):
- Introduce per-architecture stack_machdep.c to hold stack_save(9).
- Introduce per-architecture machine/stack.h to capture any common
definitions required between db_trace.c and stack_machdep.c.
- Add new kernel option "options STACK"; we will build in stack(9) if it is
defined, or also if "options DDB" is defined to provide compatibility
with existing users of stack(9).
Add new stack_save_td(9) function, which allows the capture of a stacktrace
of another thread rather than the current thread, which the existing
stack_save(9) was limited to. It requires that the thread be neither
swapped out nor running, which is the responsibility of the consumer to
enforce.
Update stack(9) man page.
Build tested: amd64, arm, i386, ia64, powerpc, sparc64, sun4v
Runtime tested: amd64 (rwatson), arm (cognet), i386 (rwatson)
2007-12-02 20:40:35 +00:00
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Memory associated with a trace is freed by calling
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2007-11-27 11:02:41 +00:00
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.Fn stack_destroy .
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.Pp
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A trace of the current kernel thread's call stack may be captured using
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2007-11-28 12:04:08 +00:00
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.Fn stack_save .
|
2015-09-11 03:56:04 +00:00
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.Fn stack_save_td
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and
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.Fn stack_save_td_running
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can also be used to capture the stack of a caller-specified thread.
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Callers of these functions must own the thread lock of the specified thread.
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.Fn stack_save_td
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can capture the stack of a kernel thread that is not running or
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swapped out at the time of the call.
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.Fn stack_save_td_running
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can capture the stack of a running kernel thread.
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2007-11-27 11:02:41 +00:00
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.Pp
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2007-11-29 17:16:55 +00:00
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.Fn stack_print
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2009-06-24 12:06:15 +00:00
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and
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.Fn stack_print_short
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2007-11-29 17:16:55 +00:00
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may be used to print a stack trace using the kernel
|
Break out stack(9) from ddb(4):
- Introduce per-architecture stack_machdep.c to hold stack_save(9).
- Introduce per-architecture machine/stack.h to capture any common
definitions required between db_trace.c and stack_machdep.c.
- Add new kernel option "options STACK"; we will build in stack(9) if it is
defined, or also if "options DDB" is defined to provide compatibility
with existing users of stack(9).
Add new stack_save_td(9) function, which allows the capture of a stacktrace
of another thread rather than the current thread, which the existing
stack_save(9) was limited to. It requires that the thread be neither
swapped out nor running, which is the responsibility of the consumer to
enforce.
Update stack(9) man page.
Build tested: amd64, arm, i386, ia64, powerpc, sparc64, sun4v
Runtime tested: amd64 (rwatson), arm (cognet), i386 (rwatson)
2007-12-02 20:40:35 +00:00
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.Xr printf 9 ,
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and may sleep as a result of acquiring
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.Xr sx 9
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locks in the kernel linker while looking up symbol names.
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In locking-sensitive environments, the unsynchronized
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.Fn stack_print_ddb
|
2009-06-24 12:06:15 +00:00
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and
|
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.Fn stack_print_short_ddb
|
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|
variants may be invoked.
|
Break out stack(9) from ddb(4):
- Introduce per-architecture stack_machdep.c to hold stack_save(9).
- Introduce per-architecture machine/stack.h to capture any common
definitions required between db_trace.c and stack_machdep.c.
- Add new kernel option "options STACK"; we will build in stack(9) if it is
defined, or also if "options DDB" is defined to provide compatibility
with existing users of stack(9).
Add new stack_save_td(9) function, which allows the capture of a stacktrace
of another thread rather than the current thread, which the existing
stack_save(9) was limited to. It requires that the thread be neither
swapped out nor running, which is the responsibility of the consumer to
enforce.
Update stack(9) man page.
Build tested: amd64, arm, i386, ia64, powerpc, sparc64, sun4v
Runtime tested: amd64 (rwatson), arm (cognet), i386 (rwatson)
2007-12-02 20:40:35 +00:00
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This function bypasses kernel linker locking, making it usable in
|
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.Xr ddb 4 ,
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but not in a live system where linker data structures may change.
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2007-11-29 17:16:55 +00:00
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.Pp
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2007-11-27 11:02:41 +00:00
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.Fn stack_sbuf_print
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may be used to construct a human-readable string, including conversion (where
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possible) from a simple kernel instruction pointer to a named symbol and
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offset.
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The argument
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.Ar sb
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must be an initialized
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.Dv struct sbuf
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as described in
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.Xr sbuf 9 .
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This function may sleep if an auto-extending
|
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.Dv struct sbuf
|
Break out stack(9) from ddb(4):
- Introduce per-architecture stack_machdep.c to hold stack_save(9).
- Introduce per-architecture machine/stack.h to capture any common
definitions required between db_trace.c and stack_machdep.c.
- Add new kernel option "options STACK"; we will build in stack(9) if it is
defined, or also if "options DDB" is defined to provide compatibility
with existing users of stack(9).
Add new stack_save_td(9) function, which allows the capture of a stacktrace
of another thread rather than the current thread, which the existing
stack_save(9) was limited to. It requires that the thread be neither
swapped out nor running, which is the responsibility of the consumer to
enforce.
Update stack(9) man page.
Build tested: amd64, arm, i386, ia64, powerpc, sparc64, sun4v
Runtime tested: amd64 (rwatson), arm (cognet), i386 (rwatson)
2007-12-02 20:40:35 +00:00
|
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is used, or due to kernel linker locking.
|
2007-12-01 22:04:16 +00:00
|
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In locking-sensitive environments, such as
|
Break out stack(9) from ddb(4):
- Introduce per-architecture stack_machdep.c to hold stack_save(9).
- Introduce per-architecture machine/stack.h to capture any common
definitions required between db_trace.c and stack_machdep.c.
- Add new kernel option "options STACK"; we will build in stack(9) if it is
defined, or also if "options DDB" is defined to provide compatibility
with existing users of stack(9).
Add new stack_save_td(9) function, which allows the capture of a stacktrace
of another thread rather than the current thread, which the existing
stack_save(9) was limited to. It requires that the thread be neither
swapped out nor running, which is the responsibility of the consumer to
enforce.
Update stack(9) man page.
Build tested: amd64, arm, i386, ia64, powerpc, sparc64, sun4v
Runtime tested: amd64 (rwatson), arm (cognet), i386 (rwatson)
2007-12-02 20:40:35 +00:00
|
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.Xr ddb 4 ,
|
2007-12-01 22:04:16 +00:00
|
|
|
the unsynchronized
|
|
|
|
.Fn stack_sbuf_print_ddb
|
Break out stack(9) from ddb(4):
- Introduce per-architecture stack_machdep.c to hold stack_save(9).
- Introduce per-architecture machine/stack.h to capture any common
definitions required between db_trace.c and stack_machdep.c.
- Add new kernel option "options STACK"; we will build in stack(9) if it is
defined, or also if "options DDB" is defined to provide compatibility
with existing users of stack(9).
Add new stack_save_td(9) function, which allows the capture of a stacktrace
of another thread rather than the current thread, which the existing
stack_save(9) was limited to. It requires that the thread be neither
swapped out nor running, which is the responsibility of the consumer to
enforce.
Update stack(9) man page.
Build tested: amd64, arm, i386, ia64, powerpc, sparc64, sun4v
Runtime tested: amd64 (rwatson), arm (cognet), i386 (rwatson)
2007-12-02 20:40:35 +00:00
|
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|
variant may be invoked to avoid kernel linker locking; it should be used with
|
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|
a fixed-length sbuf.
|
2007-11-27 11:02:41 +00:00
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.Pp
|
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The utility functions
|
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.Nm stack_zero ,
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.Nm stack_copy ,
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and
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.Nm stack_put
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may be used to manipulate stack data structures directly.
|
2015-09-11 03:56:04 +00:00
|
|
|
.Sh RETURN VALUES
|
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.Fn stack_put
|
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returns 0 on success.
|
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Otherwise the
|
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.Dv struct stack
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does not contain space to record additional frames, and a non-zero value is
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returned.
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.Pp
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.Fn stack_save_td_running
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returns 0 when the stack capture was successful and a non-zero error number
|
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otherwise.
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In particular,
|
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.Er EAGAIN
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is returned if the thread was running in user mode at the time that the
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capture was attempted, and
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.Er EOPNOTSUPP
|
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is returned if the operation is not implemented.
|
2007-11-27 11:02:41 +00:00
|
|
|
.Sh SEE ALSO
|
Break out stack(9) from ddb(4):
- Introduce per-architecture stack_machdep.c to hold stack_save(9).
- Introduce per-architecture machine/stack.h to capture any common
definitions required between db_trace.c and stack_machdep.c.
- Add new kernel option "options STACK"; we will build in stack(9) if it is
defined, or also if "options DDB" is defined to provide compatibility
with existing users of stack(9).
Add new stack_save_td(9) function, which allows the capture of a stacktrace
of another thread rather than the current thread, which the existing
stack_save(9) was limited to. It requires that the thread be neither
swapped out nor running, which is the responsibility of the consumer to
enforce.
Update stack(9) man page.
Build tested: amd64, arm, i386, ia64, powerpc, sparc64, sun4v
Runtime tested: amd64 (rwatson), arm (cognet), i386 (rwatson)
2007-12-02 20:40:35 +00:00
|
|
|
.Xr ddb 4 ,
|
2007-11-29 17:16:55 +00:00
|
|
|
.Xr printf 9 ,
|
2007-12-01 22:04:16 +00:00
|
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|
.Xr sbuf 9 ,
|
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|
|
.Xr sx 9
|
2007-11-27 11:02:41 +00:00
|
|
|
.Sh AUTHORS
|
|
|
|
.An -nosplit
|
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|
|
The
|
|
|
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.Xr stack 9
|
|
|
|
function suite was created by
|
|
|
|
.An Antoine Brodin .
|
Break out stack(9) from ddb(4):
- Introduce per-architecture stack_machdep.c to hold stack_save(9).
- Introduce per-architecture machine/stack.h to capture any common
definitions required between db_trace.c and stack_machdep.c.
- Add new kernel option "options STACK"; we will build in stack(9) if it is
defined, or also if "options DDB" is defined to provide compatibility
with existing users of stack(9).
Add new stack_save_td(9) function, which allows the capture of a stacktrace
of another thread rather than the current thread, which the existing
stack_save(9) was limited to. It requires that the thread be neither
swapped out nor running, which is the responsibility of the consumer to
enforce.
Update stack(9) man page.
Build tested: amd64, arm, i386, ia64, powerpc, sparc64, sun4v
Runtime tested: amd64 (rwatson), arm (cognet), i386 (rwatson)
2007-12-02 20:40:35 +00:00
|
|
|
.Xr stack 9
|
|
|
|
was extended by
|
|
|
|
.An Robert Watson
|
|
|
|
for general-purpose use outside of
|
|
|
|
.Xr ddb 4 .
|