[lttng-modules.git] / src / lttng-syscalls-extractor.c

/* SPDX-License-Identifier: (GPL-2.0-only or LGPL-2.1-only)
 *
 * lttng-syscalls-extractor.c
 *
 * Dump syscall metadata to console.
 *
 * Copyright 2011 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
 * Copyright 2011 EfficiOS Inc.
 */

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/list.h>
#include <linux/err.h>
#include <linux/slab.h>
#include <linux/kallsyms.h>
#include <linux/dcache.h>
#include <linux/trace_events.h>
#include <linux/kprobes.h>
#include <trace/syscall.h>
#include <asm/syscall.h>
#include <wrapper/kallsyms.h>

#ifndef CONFIG_FTRACE_SYSCALLS
#error "You need to set CONFIG_FTRACE_SYSCALLS=y"
#endif

#ifndef CONFIG_KALLSYMS_ALL
#error "You need to set CONFIG_KALLSYMS_ALL=y"
#endif

/*
 * The 'ident' parameter is prepended to each printk line to help
 * extract the proper lines from dmesg.
 */
static char *ident = "";
module_param(ident, charp, 0);

static struct syscall_metadata **__start_syscalls_metadata;
static struct syscall_metadata **__stop_syscalls_metadata;

static __init
struct syscall_metadata *find_syscall_meta(unsigned long syscall)
{
	struct syscall_metadata **iter;

	for (iter = __start_syscalls_metadata;
			iter < __stop_syscalls_metadata; iter++) {
		if ((*iter)->syscall_nr == syscall)
			return (*iter);
	}
	return NULL;
}

int init_module(void)
{
	struct syscall_metadata *meta;
	int i;

	__start_syscalls_metadata = (void *) wrapper_kallsyms_lookup_name("__start_syscalls_metadata");
	__stop_syscalls_metadata = (void *) wrapper_kallsyms_lookup_name("__stop_syscalls_metadata");

	printk("%s---START---\n", ident);
	for (i = 0; i < NR_syscalls; i++) {
		int j;

		meta = find_syscall_meta(i);
		if (!meta)
			continue;
		printk("%ssyscall %s nr %d nbargs %d ",
			ident, meta->name, meta->syscall_nr, meta->nb_args);
		printk(KERN_CONT "types: (");
		for (j = 0; j < meta->nb_args; j++) {
			if (j > 0)
				printk(KERN_CONT ", ");
			printk(KERN_CONT "%s", meta->types[j]);
		}
		printk(KERN_CONT ") ");
		printk(KERN_CONT "args: (");
		for (j = 0; j < meta->nb_args; j++) {
			if (j > 0)
				printk(KERN_CONT ", ");
			printk(KERN_CONT "%s", meta->args[j]);
		}
		printk(KERN_CONT ")\n");
	}
	printk("%s---END---\n", ident);

	/*
	 * This module always fails to load.
	 */
	return -1;
}

void cleanup_module(void)
{
}

MODULE_LICENSE("GPL");
Commit	Line	Data
b7cdc182	1	/* SPDX-License-Identifier: (GPL-2.0-only or LGPL-2.1-only)
9f36eaed	2	*
886d51a3 MD	3	* lttng-syscalls-extractor.c
	4	*
	5	* Dump syscall metadata to console.
	6	*
e709527c	7	* Copyright 2011 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
396fa37a	8	* Copyright 2011 EfficiOS Inc.
5fee13fd MD	9	*/
	10
	11	#include <linux/module.h>
	12	#include <linux/kernel.h>
	13	#include <linux/types.h>
	14	#include <linux/list.h>
	15	#include <linux/err.h>
	16	#include <linux/slab.h>
	17	#include <linux/kallsyms.h>
	18	#include <linux/dcache.h>
e709527c	19	#include <linux/trace_events.h>
d504ea73	20	#include <linux/kprobes.h>
5fee13fd	21	#include <trace/syscall.h>
7801e9f4	22	#include <asm/syscall.h>
d504ea73	23	#include <wrapper/kallsyms.h>
5fee13fd MD	24
	25	#ifndef CONFIG_FTRACE_SYSCALLS
	26	#error "You need to set CONFIG_FTRACE_SYSCALLS=y"
	27	#endif
	28
bc55cda3 MD	29	#ifndef CONFIG_KALLSYMS_ALL
	30	#error "You need to set CONFIG_KALLSYMS_ALL=y"
	31	#endif
	32
e709527c MJ	33	/*
	34	* The 'ident' parameter is prepended to each printk line to help
	35	* extract the proper lines from dmesg.
	36	*/
	37	static char *ident = "";
	38	module_param(ident, charp, 0);
	39
5fee13fd MD	40	static struct syscall_metadata **__start_syscalls_metadata;
	41	static struct syscall_metadata **__stop_syscalls_metadata;
	42
	43	static __init
	44	struct syscall_metadata *find_syscall_meta(unsigned long syscall)
	45	{
	46	struct syscall_metadata **iter;
	47
	48	for (iter = __start_syscalls_metadata;
	49	iter < __stop_syscalls_metadata; iter++) {
	50	if ((*iter)->syscall_nr == syscall)
	51	return (*iter);
	52	}
	53	return NULL;
	54	}
	55
	56	int init_module(void)
	57	{
	58	struct syscall_metadata *meta;
	59	int i;
	60
d504ea73 JG	61	__start_syscalls_metadata = (void *) wrapper_kallsyms_lookup_name("__start_syscalls_metadata");
d504ea73 JG	62	__stop_syscalls_metadata = (void *) wrapper_kallsyms_lookup_name("__stop_syscalls_metadata");
5fee13fd	63
e709527c	64	printk("%s---START---\n", ident);
5fee13fd MD	65	for (i = 0; i < NR_syscalls; i++) {
	66	int j;
	67
	68	meta = find_syscall_meta(i);
	69	if (!meta)
	70	continue;
e709527c MJ	71	printk("%ssyscall %s nr %d nbargs %d ",
	72	ident, meta->name, meta->syscall_nr, meta->nb_args);
	73	printk(KERN_CONT "types: (");
5fee13fd MD	74	for (j = 0; j < meta->nb_args; j++) {
5fee13fd MD	75	if (j > 0)
e709527c MJ	76	printk(KERN_CONT ", ");
e709527c MJ	77	printk(KERN_CONT "%s", meta->types[j]);
5fee13fd	78	}
e709527c MJ	79	printk(KERN_CONT ") ");
e709527c MJ	80	printk(KERN_CONT "args: (");
5fee13fd MD	81	for (j = 0; j < meta->nb_args; j++) {
5fee13fd MD	82	if (j > 0)
e709527c MJ	83	printk(KERN_CONT ", ");
e709527c MJ	84	printk(KERN_CONT "%s", meta->args[j]);
5fee13fd	85	}
e709527c	86	printk(KERN_CONT ")\n");
5fee13fd	87	}
e709527c	88	printk("%s---END---\n", ident);
5fee13fd	89
e709527c MJ	90	/*
	91	* This module always fails to load.
	92	*/
5fee13fd MD	93	return -1;
	94	}
	95
	96	void cleanup_module(void)
	97	{
1e543e7c	98	}
5fee13fd MD	99
5fee13fd MD	100	MODULE_LICENSE("GPL");