trace_syscalls.c 5.59 KB
Newer Older
1
#include <trace/syscall.h>
2
#include <linux/kernel.h>
3
#include <linux/ftrace.h>
4 5 6 7 8
#include <asm/syscall.h>

#include "trace_output.h"
#include "trace.h"

9
static DEFINE_MUTEX(syscall_trace_lock);
10 11 12 13
static int sys_refcount_enter;
static int sys_refcount_exit;
static DECLARE_BITMAP(enabled_enter_syscalls, FTRACE_SYSCALL_MAX);
static DECLARE_BITMAP(enabled_exit_syscalls, FTRACE_SYSCALL_MAX);
14

15
/* Option to display the parameters types */
16 17 18 19 20 21 22 23 24 25
enum {
	TRACE_SYSCALLS_OPT_TYPES = 0x1,
};

static struct tracer_opt syscalls_opts[] = {
	{ TRACER_OPT(syscall_arg_type, TRACE_SYSCALLS_OPT_TYPES) },
	{ }
};

static struct tracer_flags syscalls_flags = {
26
	.val = 0, /* By default: no parameters types */
27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98
	.opts = syscalls_opts
};

enum print_line_t
print_syscall_enter(struct trace_iterator *iter, int flags)
{
	struct trace_seq *s = &iter->seq;
	struct trace_entry *ent = iter->ent;
	struct syscall_trace_enter *trace;
	struct syscall_metadata *entry;
	int i, ret, syscall;

	trace_assign_type(trace, ent);

	syscall = trace->nr;

	entry = syscall_nr_to_meta(syscall);
	if (!entry)
		goto end;

	ret = trace_seq_printf(s, "%s(", entry->name);
	if (!ret)
		return TRACE_TYPE_PARTIAL_LINE;

	for (i = 0; i < entry->nb_args; i++) {
		/* parameter types */
		if (syscalls_flags.val & TRACE_SYSCALLS_OPT_TYPES) {
			ret = trace_seq_printf(s, "%s ", entry->types[i]);
			if (!ret)
				return TRACE_TYPE_PARTIAL_LINE;
		}
		/* parameter values */
		ret = trace_seq_printf(s, "%s: %lx%s ", entry->args[i],
				       trace->args[i],
				       i == entry->nb_args - 1 ? ")" : ",");
		if (!ret)
			return TRACE_TYPE_PARTIAL_LINE;
	}

end:
	trace_seq_printf(s, "\n");
	return TRACE_TYPE_HANDLED;
}

enum print_line_t
print_syscall_exit(struct trace_iterator *iter, int flags)
{
	struct trace_seq *s = &iter->seq;
	struct trace_entry *ent = iter->ent;
	struct syscall_trace_exit *trace;
	int syscall;
	struct syscall_metadata *entry;
	int ret;

	trace_assign_type(trace, ent);

	syscall = trace->nr;

	entry = syscall_nr_to_meta(syscall);
	if (!entry) {
		trace_seq_printf(s, "\n");
		return TRACE_TYPE_HANDLED;
	}

	ret = trace_seq_printf(s, "%s -> 0x%lx\n", entry->name,
				trace->ret);
	if (!ret)
		return TRACE_TYPE_PARTIAL_LINE;

	return TRACE_TYPE_HANDLED;
}

99
void ftrace_syscall_enter(struct pt_regs *regs, long id)
100
{
101 102 103 104
	struct syscall_trace_enter *entry;
	struct syscall_metadata *sys_data;
	struct ring_buffer_event *event;
	int size;
105 106 107
	int syscall_nr;

	syscall_nr = syscall_get_nr(current, regs);
108 109
	if (!test_bit(syscall_nr, enabled_enter_syscalls))
		return;
110

111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127
	sys_data = syscall_nr_to_meta(syscall_nr);
	if (!sys_data)
		return;

	size = sizeof(*entry) + sizeof(unsigned long) * sys_data->nb_args;

	event = trace_current_buffer_lock_reserve(TRACE_SYSCALL_ENTER, size,
							0, 0);
	if (!event)
		return;

	entry = ring_buffer_event_data(event);
	entry->nr = syscall_nr;
	syscall_get_arguments(current, regs, 0, sys_data->nb_args, entry->args);

	trace_current_buffer_unlock_commit(event, 0, 0);
	trace_wake_up();
128 129
}

130
void ftrace_syscall_exit(struct pt_regs *regs, long ret)
131
{
132 133 134
	struct syscall_trace_exit *entry;
	struct syscall_metadata *sys_data;
	struct ring_buffer_event *event;
135 136 137
	int syscall_nr;

	syscall_nr = syscall_get_nr(current, regs);
138 139
	if (!test_bit(syscall_nr, enabled_exit_syscalls))
		return;
140

141 142 143 144 145 146 147 148 149 150 151 152 153 154 155
	sys_data = syscall_nr_to_meta(syscall_nr);
	if (!sys_data)
		return;

	event = trace_current_buffer_lock_reserve(TRACE_SYSCALL_EXIT,
				sizeof(*entry), 0, 0);
	if (!event)
		return;

	entry = ring_buffer_event_data(event);
	entry->nr = syscall_nr;
	entry->ret = syscall_get_return_value(current, regs);

	trace_current_buffer_unlock_commit(event, 0, 0);
	trace_wake_up();
156 157
}

158
int reg_event_syscall_enter(void *ptr)
159
{
160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179
	int ret = 0;
	int num;
	char *name;

	name = (char *)ptr;
	num = syscall_name_to_nr(name);
	if (num < 0 || num >= FTRACE_SYSCALL_MAX)
		return -ENOSYS;
	mutex_lock(&syscall_trace_lock);
	if (!sys_refcount_enter)
		ret = register_trace_syscall_enter(ftrace_syscall_enter);
	if (ret) {
		pr_info("event trace: Could not activate"
				"syscall entry trace point");
	} else {
		set_bit(num, enabled_enter_syscalls);
		sys_refcount_enter++;
	}
	mutex_unlock(&syscall_trace_lock);
	return ret;
180 181
}

182
void unreg_event_syscall_enter(void *ptr)
183
{
184 185
	int num;
	char *name;
186

187 188 189 190 191 192 193 194 195 196 197
	name = (char *)ptr;
	num = syscall_name_to_nr(name);
	if (num < 0 || num >= FTRACE_SYSCALL_MAX)
		return;
	mutex_lock(&syscall_trace_lock);
	sys_refcount_enter--;
	clear_bit(num, enabled_enter_syscalls);
	if (!sys_refcount_enter)
		unregister_trace_syscall_enter(ftrace_syscall_enter);
	mutex_unlock(&syscall_trace_lock);
}
198

199
int reg_event_syscall_exit(void *ptr)
200
{
201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217
	int ret = 0;
	int num;
	char *name;

	name = (char *)ptr;
	num = syscall_name_to_nr(name);
	if (num < 0 || num >= FTRACE_SYSCALL_MAX)
		return -ENOSYS;
	mutex_lock(&syscall_trace_lock);
	if (!sys_refcount_exit)
		ret = register_trace_syscall_exit(ftrace_syscall_exit);
	if (ret) {
		pr_info("event trace: Could not activate"
				"syscall exit trace point");
	} else {
		set_bit(num, enabled_exit_syscalls);
		sys_refcount_exit++;
218
	}
219 220 221
	mutex_unlock(&syscall_trace_lock);
	return ret;
}
222

223 224 225 226
void unreg_event_syscall_exit(void *ptr)
{
	int num;
	char *name;
227

228 229 230 231 232 233 234 235 236 237
	name = (char *)ptr;
	num = syscall_name_to_nr(name);
	if (num < 0 || num >= FTRACE_SYSCALL_MAX)
		return;
	mutex_lock(&syscall_trace_lock);
	sys_refcount_exit--;
	clear_bit(num, enabled_exit_syscalls);
	if (!sys_refcount_exit)
		unregister_trace_syscall_exit(ftrace_syscall_exit);
	mutex_unlock(&syscall_trace_lock);
238
}
239 240 241 242 243 244 245 246 247 248

struct trace_event event_syscall_enter = {
	.trace			= print_syscall_enter,
	.type			= TRACE_SYSCALL_ENTER
};

struct trace_event event_syscall_exit = {
	.trace			= print_syscall_exit,
	.type			= TRACE_SYSCALL_EXIT
};