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// logging tapset
// Copyright (C) 2005-2011 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 ftrace - Send a message to the ftrace ring-buffer
*
* @msg: The formatted message string
*
* Description: If the ftrace ring-buffer is configured & available,
* see /debugfs/tracing/trace for the message. Otherwise, the
* message may be quietly dropped. An implicit end-of-line is added.
*/
function ftrace (msg:string) %{ /* unmodified-fnargs */
#ifdef STAPCONF_TRACE_PRINTK
static char *fmt = "%s\n";
trace_printk (fmt, STAP_ARG_msg);
/* The "fmt" is designed to be non __builtin_constant_p(), so as
to defeat trace_printk -> __trace_bprintk optimization. That's
because bprintk doesn't save the incoming strings, only their
addresses. */
#else
#error "trace_printk not supported"
#endif
%}
/**
* sfunction printk - Send a message to the kernel trace buffer
*
* @level: an integer for the severity level (0=KERN_EMERG ... 7=KERN_DEBUG)
* @msg: The formatted message string
*
* Description: Print a line of text to the kernel dmesg/console with the
* given severity. An implicit end-of-line is added. This function may
* not be safely called from all kernel probe contexts, so is restricted
* to guru mode only.
*/
function printk (level:long,msg:string) %{ /* guru */ /* unmodified-fnargs */
printk (STAP_ARG_level == 0 ? KERN_EMERG "%s\n":
STAP_ARG_level == 1 ? KERN_ALERT "%s\n":
STAP_ARG_level == 2 ? KERN_CRIT "%s\n":
STAP_ARG_level == 3 ? KERN_ERR "%s\n":
STAP_ARG_level == 4 ? KERN_WARNING "%s\n":
STAP_ARG_level == 5 ? KERN_NOTICE "%s\n":
STAP_ARG_level == 6 ? KERN_INFO "%s\n":
STAP_ARG_level == 7 ? KERN_DEBUG "%s\n":
#ifdef KERN_DEFAULT
KERN_DEFAULT "%s\n"
#else
KERN_INFO "%s\n"
#endif
, STAP_ARG_msg);
%}
/**
* sfunction dump_stack - Send the kernel backtrace to the kernel trace buffer
*
* Description: Print the current kernel backtrace to the kernel trace buffer.
This function may * not be safely called from all kernel probe contexts, so
* is restricted to guru mode only. Under the hood, it calls the kernel C API
* function dump_stack directly.
*/
function dump_stack () %{ /* guru */
dump_stack();
%}
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