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편집 파일: context.stp

// context tapset
// Copyright (C) 2005-2011 Red Hat Inc.
// Copyright (C) 2006 Intel Corporation.
//
// 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.
// <tapsetdescription>
// Context functions provide additional information about where an event occurred. These functions can
//provide information such as a backtrace to where the event occurred and the current register values for the
//processor.
// </tapsetdescription>

/**
 * sfunction print_regs - Print a register dump
 * 
 * Description: This function prints a register dump. Does nothing if no registers are available for the probe point.
 */
function print_regs ()
%{
	if (c->user_mode_p && CONTEXT->uregs) {
		_stp_print_regs (CONTEXT->uregs);
	} else if (CONTEXT->kregs) {
		_stp_print_regs (CONTEXT->kregs);
	}
%}

/**
 * sfunction pp - Returns the active probe point
 *
 * Description: This function returns the fully-resolved probe point
 * associated with a currently running probe handler, including alias
 * and wild-card expansion effects. Context: The current probe point.
 */
function pp:string ()
%{ /* pure */ /* unprivileged */ /* stable */
	strlcpy (STAP_RETVALUE, CONTEXT->probe_point, MAXSTRINGLEN);
%}

/**
 * sfunction ppfunc - Returns the function name parsed from pp()
 *
 * Description: This returns the function name from the current pp().
 * Not all pp() have functions in them, in which case "" is returned.
 */
function ppfunc:string ()
%{ /* pure */ /* unprivileged */ /* stable */
	char *ptr, *start;

/* This is based on the pre-2.0 behavior of probefunc(), but without
	 * the _stp_snprint_addr fallback, so we're purely pp()-based.
	 *
	 * The obsolete inline("...") syntax is dropped, but in its place we'll
	 * look for function names in statement("...") form.
	 */

STAP_RETVALUE[0] = '\0';
	start = strstr(CONTEXT->probe_point, "function(\"");
	ptr = start + 10;
	if (!start) {
		start = strstr(CONTEXT->probe_point, "statement(\"");
		ptr = start + 11;
	}

if (start) {
		int len = MAXSTRINGLEN;
		char *dst = STAP_RETVALUE;
		while (*ptr != '@' && *ptr != '"' && --len > 0 && *ptr)
			*dst++ = *ptr++;
		*dst = 0;
	}
%}

/**
 * sfunction probe_type - The low level probe handler type of the current probe.
 *
 * Description: Returns a short string describing the low level probe handler
 * type for the current probe point. This is for informational purposes only.
 * Depending on the low level probe handler different context functions can
 * or cannot provide information about the current event (for example some
 * probe handlers only trigger in user space and have no associated kernel
 * context). High-level probes might map to the same or different low-level
 * probes (depending on systemtap version and/or kernel used).
 */
function probe_type:string()
%{ /* pure */ /* unprivileged */ /* stable */
  switch (CONTEXT->probe_type)
  {
    case stp_probe_type_been:
      strlcpy (STAP_RETVALUE, "begin_end", MAXSTRINGLEN);
      break;
    case stp_probe_type_itrace:
      strlcpy (STAP_RETVALUE, "itrace", MAXSTRINGLEN);
      break;
    case stp_probe_type_marker:
      strlcpy (STAP_RETVALUE, "kernel_marker", MAXSTRINGLEN);
      break;
    case stp_probe_type_perf:
      strlcpy (STAP_RETVALUE, "perf_event", MAXSTRINGLEN);
      break;
    case stp_probe_type_procfs:
      strlcpy (STAP_RETVALUE, "procfs", MAXSTRINGLEN);
      break;
    case stp_probe_type_timer:
      strlcpy (STAP_RETVALUE, "timer", MAXSTRINGLEN);
      break;
    case stp_probe_type_hrtimer:
      strlcpy (STAP_RETVALUE, "hrtimer", MAXSTRINGLEN);
      break;
    case stp_probe_type_profile_timer:
      strlcpy (STAP_RETVALUE, "profile_timer", MAXSTRINGLEN);
      break;
    case stp_probe_type_netfilter:
      strlcpy (STAP_RETVALUE, "netfilter", MAXSTRINGLEN);
      break;
    case stp_probe_type_utrace:
      strlcpy (STAP_RETVALUE, "utrace", MAXSTRINGLEN);
      break;
    case stp_probe_type_utrace_syscall:
      strlcpy (STAP_RETVALUE, "utrace_syscall", MAXSTRINGLEN);
      break;
    case stp_probe_type_kprobe:
      strlcpy (STAP_RETVALUE, "kprobe", MAXSTRINGLEN);
      break;
    case stp_probe_type_kretprobe:
      strlcpy (STAP_RETVALUE, "kretprobe", MAXSTRINGLEN);
      break;
    case stp_probe_type_uprobe:
      strlcpy (STAP_RETVALUE, "uprobe", MAXSTRINGLEN);
      break;
    case stp_probe_type_uretprobe:
      strlcpy (STAP_RETVALUE, "uretprobe", MAXSTRINGLEN);
      break;
    case stp_probe_type_hwbkpt:
      strlcpy (STAP_RETVALUE, "hardware_data_breakpoint", MAXSTRINGLEN);
      break;
    case stp_probe_type_tracepoint:
      strlcpy (STAP_RETVALUE, "kernel_tracepoint", MAXSTRINGLEN);
      break;
    default:
      /* This should never happen. */
      snprintf(CONTEXT->error_buffer, sizeof(CONTEXT->error_buffer),
               "Unknown probe-type state %d", CONTEXT->probe_type);
      CONTEXT->last_error = CONTEXT->error_buffer;
      break;
  }
%}