| 1 | /* |
| 2 | * lttng-syscalls-extractor.c |
| 3 | * |
| 4 | * Dump syscall metadata to console. |
| 5 | * |
| 6 | * Copyright 2011 - Mathieu Desnoyers <mathieu.desnoyers@efficios.com> |
| 7 | * Copyright 2011 - Julien Desfossez <julien.desfossez@polymtl.ca> |
| 8 | * |
| 9 | * This program is free software; you can redistribute it and/or modify |
| 10 | * it under the terms of the GNU General Public License as published by |
| 11 | * the Free Software Foundation; either version 2 of the License, or |
| 12 | * (at your option) any later version. |
| 13 | * |
| 14 | * This program is distributed in the hope that it will be useful, |
| 15 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 17 | * GNU General Public License for more details. |
| 18 | * |
| 19 | * You should have received a copy of the GNU General Public License along |
| 20 | * with this program; if not, write to the Free Software Foundation, Inc., |
| 21 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. |
| 22 | */ |
| 23 | |
| 24 | #include <linux/module.h> |
| 25 | #include <linux/kernel.h> |
| 26 | #include <linux/types.h> |
| 27 | #include <linux/list.h> |
| 28 | #include <linux/err.h> |
| 29 | #include <linux/slab.h> |
| 30 | #include <linux/kallsyms.h> |
| 31 | #include <linux/dcache.h> |
| 32 | #include <linux/ftrace_event.h> |
| 33 | #include <trace/syscall.h> |
| 34 | #include <asm/syscall.h> |
| 35 | |
| 36 | #ifndef CONFIG_FTRACE_SYSCALLS |
| 37 | #error "You need to set CONFIG_FTRACE_SYSCALLS=y" |
| 38 | #endif |
| 39 | |
| 40 | #ifndef CONFIG_KALLSYMS_ALL |
| 41 | #error "You need to set CONFIG_KALLSYMS_ALL=y" |
| 42 | #endif |
| 43 | |
| 44 | static struct syscall_metadata **__start_syscalls_metadata; |
| 45 | static struct syscall_metadata **__stop_syscalls_metadata; |
| 46 | |
| 47 | static __init |
| 48 | struct syscall_metadata *find_syscall_meta(unsigned long syscall) |
| 49 | { |
| 50 | struct syscall_metadata **iter; |
| 51 | |
| 52 | for (iter = __start_syscalls_metadata; |
| 53 | iter < __stop_syscalls_metadata; iter++) { |
| 54 | if ((*iter)->syscall_nr == syscall) |
| 55 | return (*iter); |
| 56 | } |
| 57 | return NULL; |
| 58 | } |
| 59 | |
| 60 | int init_module(void) |
| 61 | { |
| 62 | struct syscall_metadata *meta; |
| 63 | int i; |
| 64 | |
| 65 | __start_syscalls_metadata = (void *) kallsyms_lookup_name("__start_syscalls_metadata"); |
| 66 | __stop_syscalls_metadata = (void *) kallsyms_lookup_name("__stop_syscalls_metadata"); |
| 67 | |
| 68 | for (i = 0; i < NR_syscalls; i++) { |
| 69 | int j; |
| 70 | |
| 71 | meta = find_syscall_meta(i); |
| 72 | if (!meta) |
| 73 | continue; |
| 74 | printk("syscall %s nr %d nbargs %d ", |
| 75 | meta->name, meta->syscall_nr, meta->nb_args); |
| 76 | printk("types: ("); |
| 77 | for (j = 0; j < meta->nb_args; j++) { |
| 78 | if (j > 0) |
| 79 | printk(", "); |
| 80 | printk("%s", meta->types[j]); |
| 81 | } |
| 82 | printk(") "); |
| 83 | printk("args: ("); |
| 84 | for (j = 0; j < meta->nb_args; j++) { |
| 85 | if (j > 0) |
| 86 | printk(", "); |
| 87 | printk("%s", meta->args[j]); |
| 88 | } |
| 89 | printk(")\n"); |
| 90 | } |
| 91 | printk("SUCCESS\n"); |
| 92 | |
| 93 | return -1; |
| 94 | } |
| 95 | |
| 96 | void cleanup_module(void) |
| 97 | { |
| 98 | } |
| 99 | |
| 100 | MODULE_LICENSE("GPL"); |