projects / lttng-modules.git / blame
| 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 MJ |
7 | * Copyright 2011 Mathieu Desnoyers <mathieu.desnoyers@efficios.com> |
| 8 | * Copyright 2011 Julien Desfossez <julien.desfossez@polymtl.ca> | |
| 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> |
| 5fee13fd | 20 | #include <trace/syscall.h> |
| 7801e9f4 | 21 | #include <asm/syscall.h> |
| 5fee13fd MD |
22 | |
| 23 | #ifndef CONFIG_FTRACE_SYSCALLS | |
| 24 | #error "You need to set CONFIG_FTRACE_SYSCALLS=y" | |
| 25 | #endif | |
| 26 | ||
| bc55cda3 MD |
27 | #ifndef CONFIG_KALLSYMS_ALL |
| 28 | #error "You need to set CONFIG_KALLSYMS_ALL=y" | |
| 29 | #endif | |
| 30 | ||
| e709527c MJ |
31 | /* |
| 32 | * The 'ident' parameter is prepended to each printk line to help | |
| 33 | * extract the proper lines from dmesg. | |
| 34 | */ | |
| 35 | static char *ident = ""; | |
| 36 | module_param(ident, charp, 0); | |
| 37 | ||
| 5fee13fd MD |
38 | static struct syscall_metadata **__start_syscalls_metadata; |
| 39 | static struct syscall_metadata **__stop_syscalls_metadata; | |
| 40 | ||
| 41 | static __init | |
| 42 | struct syscall_metadata *find_syscall_meta(unsigned long syscall) | |
| 43 | { | |
| 44 | struct syscall_metadata **iter; | |
| 45 | ||
| 46 | for (iter = __start_syscalls_metadata; | |
| 47 | iter < __stop_syscalls_metadata; iter++) { | |
| 48 | if ((*iter)->syscall_nr == syscall) | |
| 49 | return (*iter); | |
| 50 | } | |
| 51 | return NULL; | |
| 52 | } | |
| 53 | ||
| 54 | int init_module(void) | |
| 55 | { | |
| 56 | struct syscall_metadata *meta; | |
| 57 | int i; | |
| 58 | ||
| 59 | __start_syscalls_metadata = (void *) kallsyms_lookup_name("__start_syscalls_metadata"); | |
| 60 | __stop_syscalls_metadata = (void *) kallsyms_lookup_name("__stop_syscalls_metadata"); | |
| 61 | ||
| e709527c | 62 | printk("%s---START---\n", ident); |
| 5fee13fd MD |
63 | for (i = 0; i < NR_syscalls; i++) { |
| 64 | int j; | |
| 65 | ||
| 66 | meta = find_syscall_meta(i); | |
| 67 | if (!meta) | |
| 68 | continue; | |
| e709527c MJ |
69 | printk("%ssyscall %s nr %d nbargs %d ", |
| 70 | ident, meta->name, meta->syscall_nr, meta->nb_args); | |
| 71 | printk(KERN_CONT "types: ("); | |
| 5fee13fd MD |
72 | for (j = 0; j < meta->nb_args; j++) { |
| 73 | if (j > 0) | |
| e709527c MJ |
74 | printk(KERN_CONT ", "); |
| 75 | printk(KERN_CONT "%s", meta->types[j]); | |
| 5fee13fd | 76 | } |
| e709527c MJ |
77 | printk(KERN_CONT ") "); |
| 78 | printk(KERN_CONT "args: ("); | |
| 5fee13fd MD |
79 | for (j = 0; j < meta->nb_args; j++) { |
| 80 | if (j > 0) | |
| e709527c MJ |
81 | printk(KERN_CONT ", "); |
| 82 | printk(KERN_CONT "%s", meta->args[j]); | |
| 5fee13fd | 83 | } |
| e709527c | 84 | printk(KERN_CONT ")\n"); |
| 5fee13fd | 85 | } |
| e709527c | 86 | printk("%s---END---\n", ident); |
| 5fee13fd | 87 | |
| e709527c MJ |
88 | /* |
| 89 | * This module always fails to load. | |
| 90 | */ | |
| 5fee13fd MD |
91 | return -1; |
| 92 | } | |
| 93 | ||
| 94 | void cleanup_module(void) | |
| 95 | { | |
| 1e543e7c | 96 | } |
| 5fee13fd MD |
97 | |
| 98 | MODULE_LICENSE("GPL"); |