/usr/share/systemtap/tapset/linux/ucontext-unwind.stp is in systemtap-common 2.6-0.2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 | // User context unwind tapset
// Copyright (C) 2009-2013 Red Hat Inc.
//
// This file is part of systemtap, and is free software. You can
// redistribute it and/or modify it under the terms of the GNU General
// Public License (GPL); either version 2, or (at your option) any
// later version.
/**
* sfunction print_ubacktrace - Print stack back trace for current user-space task.
*
* Equivalent to print_ustack(ubacktrace()), except that deeper stack
* nesting may be supported. Returns nothing. See print_backtrace()
* for kernel backtrace.
*
* Note: To get (full) backtraces for user space applications and shared
* shared libraries not mentioned in the current script run stap with
* -d /path/to/exe-or-so and/or add --ldd to load all needed unwind data.
*/
function print_ubacktrace () %{ /* pragma:unwind */ /* pragma:symbols */
/* myproc-unprivileged */ /* pragma:uprobes */ /* pragma:vma */
_stp_stack_user_print(CONTEXT, _STP_SYM_FULL);
%}
/**
* sfunction sprint_ubacktrace - Return stack back trace for current user-space task as string.
*
* Returns a simple backtrace for the current task. One line per
* address. Includes the symbol name (or hex address if symbol
* couldn't be resolved) and module name (if found). Includes the
* offset from the start of the function if found, otherwise the
* offset will be added to the module (if found, between
* brackets). Returns the backtrace as string (each line terminated by
* a newline character). Note that the returned stack will be
* truncated to MAXSTRINGLEN, to print fuller and richer stacks use
* print_ubacktrace(). Equivalent to sprint_ustack(ubacktrace()),
* but more efficient (no need to translate between hex strings and
* final backtrace string).
*
* Note: To get (full) backtraces for user space applications and shared
* shared libraries not mentioned in the current script run stap with
* -d /path/to/exe-or-so and/or add --ldd to load all needed unwind data.
*/
function sprint_ubacktrace:string () %{ /* pragma:unwind */ /* pragma:symbols */
/* pure */ /* myproc-unprivileged */ /* pragma:uprobes */ /* pragma:vma */
_stp_stack_user_sprint (STAP_RETVALUE, MAXSTRINGLEN, CONTEXT,
_STP_SYM_SIMPLE);
%}
/**
* sfunction print_ubacktrace_brief- Print stack back trace for current user-space task.
*
* Equivalent to print_ubacktrace(), but output for each symbol is
* shorter (just name and offset, or just the hex address of no symbol
* could be found).
*
* Note: To get (full) backtraces for user space applications and shared
* shared libraries not mentioned in the current script run stap with
* -d /path/to/exe-or-so and/or add --ldd to load all needed unwind data.
*/
function print_ubacktrace_brief () %{ /* pragma:unwind */ /* pragma:symbols */
/* myproc-unprivileged */ /* pragma:uprobes */ /* pragma:vma */
_stp_stack_user_print(CONTEXT, _STP_SYM_BRIEF);
%}
/**
* sfunction ubacktrace - Hex backtrace of current user-space task stack.
*
* Return a string of hex addresses that are a backtrace of the
* stack of the current task. Output may be truncated as per maximum
* string length. Returns empty string when current probe point cannot
* determine user backtrace. See backtrace() for kernel traceback.
*
* Note: To get (full) backtraces for user space applications and shared
* shared libraries not mentioned in the current script run stap with
* -d /path/to/exe-or-so and/or add --ldd to load all needed unwind data.
*/
function ubacktrace:string () %{ /* pragma:unwind */
/* pure */ /* myproc-unprivileged */ /* pragma:uprobes */ /* pragma:vma */
_stp_stack_user_sprint (STAP_RETVALUE, MAXSTRINGLEN, CONTEXT,
_STP_SYM_NONE);
%}
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