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Filename : ucontext-unwind.stp
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// 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 */ /* stable */ /* 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 */ /* stable */ /* myproc-unprivileged */ /* pragma:uprobes */ /* pragma:vma */
    _stp_stack_user_sprint (STAP_RETVALUE, MAXSTRINGLEN, CONTEXT,
			    _STP_SYM_NONE);
%}