#include "trace_probe.h"
+#undef C
+#define C(a, b) b
+
+static const char *trace_probe_err_text[] = { ERRORS };
+
static const char *reserved_field_names[] = {
"common_type",
"common_flags",
/* Special types */
__ASSIGN_FETCH_TYPE("string", string, string, sizeof(u32), 1,
"__data_loc char[]"),
+ __ASSIGN_FETCH_TYPE("ustring", string, string, sizeof(u32), 1,
+ "__data_loc char[]"),
/* Basic types */
ASSIGN_FETCH_TYPE(u8, u8, 0),
ASSIGN_FETCH_TYPE(u16, u16, 0),
return NULL;
}
+static struct trace_probe_log trace_probe_log;
+
+void trace_probe_log_init(const char *subsystem, int argc, const char **argv)
+{
+ trace_probe_log.subsystem = subsystem;
+ trace_probe_log.argc = argc;
+ trace_probe_log.argv = argv;
+ trace_probe_log.index = 0;
+}
+
+void trace_probe_log_clear(void)
+{
+ memset(&trace_probe_log, 0, sizeof(trace_probe_log));
+}
+
+void trace_probe_log_set_index(int index)
+{
+ trace_probe_log.index = index;
+}
+
+void __trace_probe_log_err(int offset, int err_type)
+{
+ char *command, *p;
+ int i, len = 0, pos = 0;
+
+ if (!trace_probe_log.argv)
+ return;
+
+ /* Recalcurate the length and allocate buffer */
+ for (i = 0; i < trace_probe_log.argc; i++) {
+ if (i == trace_probe_log.index)
+ pos = len;
+ len += strlen(trace_probe_log.argv[i]) + 1;
+ }
+ command = kzalloc(len, GFP_KERNEL);
+ if (!command)
+ return;
+
+ /* And make a command string from argv array */
+ p = command;
+ for (i = 0; i < trace_probe_log.argc; i++) {
+ len = strlen(trace_probe_log.argv[i]);
+ strcpy(p, trace_probe_log.argv[i]);
+ p[len] = ' ';
+ p += len + 1;
+ }
+ *(p - 1) = '\0';
+
+ tracing_log_err(NULL, trace_probe_log.subsystem, command,
+ trace_probe_err_text, err_type, pos + offset);
+
+ kfree(command);
+}
+
/* Split symbol and offset. */
int traceprobe_split_symbol_offset(char *symbol, long *offset)
{
/* @buf must has MAX_EVENT_NAME_LEN size */
int traceprobe_parse_event_name(const char **pevent, const char **pgroup,
- char *buf)
+ char *buf, int offset)
{
const char *slash, *event = *pevent;
int len;
slash = strchr(event, '/');
if (slash) {
if (slash == event) {
- pr_info("Group name is not specified\n");
+ trace_probe_log_err(offset, NO_GROUP_NAME);
return -EINVAL;
}
if (slash - event + 1 > MAX_EVENT_NAME_LEN) {
- pr_info("Group name is too long\n");
- return -E2BIG;
+ trace_probe_log_err(offset, GROUP_TOO_LONG);
+ return -EINVAL;
}
strlcpy(buf, event, slash - event + 1);
if (!is_good_name(buf)) {
- pr_info("Group name must follow the same rules as C identifiers\n");
+ trace_probe_log_err(offset, BAD_GROUP_NAME);
return -EINVAL;
}
*pgroup = buf;
*pevent = slash + 1;
+ offset += slash - event + 1;
event = *pevent;
}
len = strlen(event);
if (len == 0) {
- pr_info("Event name is not specified\n");
+ trace_probe_log_err(offset, NO_EVENT_NAME);
return -EINVAL;
} else if (len > MAX_EVENT_NAME_LEN) {
- pr_info("Event name is too long\n");
- return -E2BIG;
+ trace_probe_log_err(offset, EVENT_TOO_LONG);
+ return -EINVAL;
}
if (!is_good_name(event)) {
- pr_info("Event name must follow the same rules as C identifiers\n");
+ trace_probe_log_err(offset, BAD_EVENT_NAME);
return -EINVAL;
}
return 0;
#define PARAM_MAX_STACK (THREAD_SIZE / sizeof(unsigned long))
static int parse_probe_vars(char *arg, const struct fetch_type *t,
- struct fetch_insn *code, unsigned int flags)
+ struct fetch_insn *code, unsigned int flags, int offs)
{
unsigned long param;
int ret = 0;
int len;
if (strcmp(arg, "retval") == 0) {
- if (flags & TPARG_FL_RETURN)
+ if (flags & TPARG_FL_RETURN) {
code->op = FETCH_OP_RETVAL;
- else
+ } else {
+ trace_probe_log_err(offs, RETVAL_ON_PROBE);
ret = -EINVAL;
+ }
} else if ((len = str_has_prefix(arg, "stack"))) {
if (arg[len] == '\0') {
code->op = FETCH_OP_STACKP;
} else if (isdigit(arg[len])) {
ret = kstrtoul(arg + len, 10, ¶m);
- if (ret || ((flags & TPARG_FL_KERNEL) &&
- param > PARAM_MAX_STACK))
+ if (ret) {
+ goto inval_var;
+ } else if ((flags & TPARG_FL_KERNEL) &&
+ param > PARAM_MAX_STACK) {
+ trace_probe_log_err(offs, BAD_STACK_NUM);
ret = -EINVAL;
- else {
+ } else {
code->op = FETCH_OP_STACK;
code->param = (unsigned int)param;
}
} else
- ret = -EINVAL;
+ goto inval_var;
} else if (strcmp(arg, "comm") == 0) {
code->op = FETCH_OP_COMM;
#ifdef CONFIG_HAVE_FUNCTION_ARG_ACCESS_API
} else if (((flags & TPARG_FL_MASK) ==
(TPARG_FL_KERNEL | TPARG_FL_FENTRY)) &&
(len = str_has_prefix(arg, "arg"))) {
- if (!isdigit(arg[len]))
- return -EINVAL;
ret = kstrtoul(arg + len, 10, ¶m);
- if (ret || !param || param > PARAM_MAX_STACK)
+ if (ret) {
+ goto inval_var;
+ } else if (!param || param > PARAM_MAX_STACK) {
+ trace_probe_log_err(offs, BAD_ARG_NUM);
return -EINVAL;
+ }
code->op = FETCH_OP_ARG;
code->param = (unsigned int)param - 1;
#endif
} else
- ret = -EINVAL;
+ goto inval_var;
return ret;
+
+inval_var:
+ trace_probe_log_err(offs, BAD_VAR);
+ return -EINVAL;
}
/* Recursive argument parser */
static int
parse_probe_arg(char *arg, const struct fetch_type *type,
struct fetch_insn **pcode, struct fetch_insn *end,
- unsigned int flags)
+ unsigned int flags, int offs)
{
struct fetch_insn *code = *pcode;
unsigned long param;
+ int deref = FETCH_OP_DEREF;
long offset = 0;
char *tmp;
int ret = 0;
switch (arg[0]) {
case '$':
- ret = parse_probe_vars(arg + 1, type, code, flags);
+ ret = parse_probe_vars(arg + 1, type, code, flags, offs);
break;
case '%': /* named register */
code->op = FETCH_OP_REG;
code->param = (unsigned int)ret;
ret = 0;
- }
+ } else
+ trace_probe_log_err(offs, BAD_REG_NAME);
break;
case '@': /* memory, file-offset or symbol */
if (isdigit(arg[1])) {
ret = kstrtoul(arg + 1, 0, ¶m);
- if (ret)
+ if (ret) {
+ trace_probe_log_err(offs, BAD_MEM_ADDR);
break;
+ }
/* load address */
code->op = FETCH_OP_IMM;
code->immediate = param;
} else if (arg[1] == '+') {
/* kprobes don't support file offsets */
- if (flags & TPARG_FL_KERNEL)
+ if (flags & TPARG_FL_KERNEL) {
+ trace_probe_log_err(offs, FILE_ON_KPROBE);
return -EINVAL;
-
+ }
ret = kstrtol(arg + 2, 0, &offset);
- if (ret)
+ if (ret) {
+ trace_probe_log_err(offs, BAD_FILE_OFFS);
break;
+ }
code->op = FETCH_OP_FOFFS;
code->immediate = (unsigned long)offset; // imm64?
} else {
/* uprobes don't support symbols */
- if (!(flags & TPARG_FL_KERNEL))
+ if (!(flags & TPARG_FL_KERNEL)) {
+ trace_probe_log_err(offs, SYM_ON_UPROBE);
return -EINVAL;
-
+ }
/* Preserve symbol for updating */
code->op = FETCH_NOP_SYMBOL;
code->data = kstrdup(arg + 1, GFP_KERNEL);
if (!code->data)
return -ENOMEM;
- if (++code == end)
- return -E2BIG;
-
+ if (++code == end) {
+ trace_probe_log_err(offs, TOO_MANY_OPS);
+ return -EINVAL;
+ }
code->op = FETCH_OP_IMM;
code->immediate = 0;
}
/* These are fetching from memory */
- if (++code == end)
- return -E2BIG;
+ if (++code == end) {
+ trace_probe_log_err(offs, TOO_MANY_OPS);
+ return -EINVAL;
+ }
*pcode = code;
code->op = FETCH_OP_DEREF;
code->offset = offset;
break;
case '+': /* deref memory */
- arg++; /* Skip '+', because kstrtol() rejects it. */
- /* fall through */
case '-':
+ if (arg[1] == 'u') {
+ deref = FETCH_OP_UDEREF;
+ arg[1] = arg[0];
+ arg++;
+ }
+ if (arg[0] == '+')
+ arg++; /* Skip '+', because kstrtol() rejects it. */
tmp = strchr(arg, '(');
- if (!tmp)
+ if (!tmp) {
+ trace_probe_log_err(offs, DEREF_NEED_BRACE);
return -EINVAL;
-
+ }
*tmp = '\0';
ret = kstrtol(arg, 0, &offset);
- if (ret)
+ if (ret) {
+ trace_probe_log_err(offs, BAD_DEREF_OFFS);
break;
-
+ }
+ offs += (tmp + 1 - arg) + (arg[0] != '-' ? 1 : 0);
arg = tmp + 1;
tmp = strrchr(arg, ')');
-
- if (tmp) {
+ if (!tmp) {
+ trace_probe_log_err(offs + strlen(arg),
+ DEREF_OPEN_BRACE);
+ return -EINVAL;
+ } else {
const struct fetch_type *t2 = find_fetch_type(NULL);
*tmp = '\0';
- ret = parse_probe_arg(arg, t2, &code, end, flags);
+ ret = parse_probe_arg(arg, t2, &code, end, flags, offs);
if (ret)
break;
- if (code->op == FETCH_OP_COMM)
+ if (code->op == FETCH_OP_COMM) {
+ trace_probe_log_err(offs, COMM_CANT_DEREF);
+ return -EINVAL;
+ }
+ if (++code == end) {
+ trace_probe_log_err(offs, TOO_MANY_OPS);
return -EINVAL;
- if (++code == end)
- return -E2BIG;
+ }
*pcode = code;
- code->op = FETCH_OP_DEREF;
+ code->op = deref;
code->offset = offset;
}
break;
}
if (!ret && code->op == FETCH_OP_NOP) {
/* Parsed, but do not find fetch method */
+ trace_probe_log_err(offs, BAD_FETCH_ARG);
ret = -EINVAL;
}
return ret;
return -EINVAL;
code++;
if (code->op != FETCH_OP_NOP)
- return -E2BIG;
+ return -EINVAL;
*pcode = code;
code->op = FETCH_OP_MOD_BF;
/* String length checking wrapper */
static int traceprobe_parse_probe_arg_body(char *arg, ssize_t *size,
- struct probe_arg *parg, unsigned int flags)
+ struct probe_arg *parg, unsigned int flags, int offset)
{
struct fetch_insn *code, *scode, *tmp = NULL;
- char *t, *t2;
+ char *t, *t2, *t3;
int ret, len;
- if (strlen(arg) > MAX_ARGSTR_LEN) {
- pr_info("Argument is too long.: %s\n", arg);
- return -ENOSPC;
+ len = strlen(arg);
+ if (len > MAX_ARGSTR_LEN) {
+ trace_probe_log_err(offset, ARG_TOO_LONG);
+ return -EINVAL;
+ } else if (len == 0) {
+ trace_probe_log_err(offset, NO_ARG_BODY);
+ return -EINVAL;
}
+
parg->comm = kstrdup(arg, GFP_KERNEL);
- if (!parg->comm) {
- pr_info("Failed to allocate memory for command '%s'.\n", arg);
+ if (!parg->comm)
return -ENOMEM;
- }
+
t = strchr(arg, ':');
if (t) {
*t = '\0';
t2 = strchr(++t, '[');
if (t2) {
- *t2 = '\0';
- parg->count = simple_strtoul(t2 + 1, &t2, 0);
- if (strcmp(t2, "]") || parg->count == 0)
+ *t2++ = '\0';
+ t3 = strchr(t2, ']');
+ if (!t3) {
+ offset += t2 + strlen(t2) - arg;
+ trace_probe_log_err(offset,
+ ARRAY_NO_CLOSE);
+ return -EINVAL;
+ } else if (t3[1] != '\0') {
+ trace_probe_log_err(offset + t3 + 1 - arg,
+ BAD_ARRAY_SUFFIX);
+ return -EINVAL;
+ }
+ *t3 = '\0';
+ if (kstrtouint(t2, 0, &parg->count) || !parg->count) {
+ trace_probe_log_err(offset + t2 - arg,
+ BAD_ARRAY_NUM);
+ return -EINVAL;
+ }
+ if (parg->count > MAX_ARRAY_LEN) {
+ trace_probe_log_err(offset + t2 - arg,
+ ARRAY_TOO_BIG);
return -EINVAL;
- if (parg->count > MAX_ARRAY_LEN)
- return -E2BIG;
+ }
}
}
- /*
- * The default type of $comm should be "string", and it can't be
- * dereferenced.
- */
- if (!t && strcmp(arg, "$comm") == 0)
+
+ /* Since $comm can not be dereferred, we can find $comm by strcmp */
+ if (strcmp(arg, "$comm") == 0) {
+ /* The type of $comm must be "string", and not an array. */
+ if (parg->count || (t && strcmp(t, "string")))
+ return -EINVAL;
parg->type = find_fetch_type("string");
- else
+ } else
parg->type = find_fetch_type(t);
if (!parg->type) {
- pr_info("Unsupported type: %s\n", t);
+ trace_probe_log_err(offset + (t ? (t - arg) : 0), BAD_TYPE);
return -EINVAL;
}
parg->offset = *size;
parg->count);
}
- code = tmp = kzalloc(sizeof(*code) * FETCH_INSN_MAX, GFP_KERNEL);
+ code = tmp = kcalloc(FETCH_INSN_MAX, sizeof(*code), GFP_KERNEL);
if (!code)
return -ENOMEM;
code[FETCH_INSN_MAX - 1].op = FETCH_OP_END;
ret = parse_probe_arg(arg, parg->type, &code, &code[FETCH_INSN_MAX - 1],
- flags);
+ flags, offset);
if (ret)
goto fail;
/* Store operation */
- if (!strcmp(parg->type->name, "string")) {
- if (code->op != FETCH_OP_DEREF && code->op != FETCH_OP_IMM &&
- code->op != FETCH_OP_COMM) {
- pr_info("string only accepts memory or address.\n");
+ if (!strcmp(parg->type->name, "string") ||
+ !strcmp(parg->type->name, "ustring")) {
+ if (code->op != FETCH_OP_DEREF && code->op != FETCH_OP_UDEREF &&
+ code->op != FETCH_OP_IMM && code->op != FETCH_OP_COMM) {
+ trace_probe_log_err(offset + (t ? (t - arg) : 0),
+ BAD_STRING);
ret = -EINVAL;
goto fail;
}
- if (code->op != FETCH_OP_DEREF || parg->count) {
+ if ((code->op == FETCH_OP_IMM || code->op == FETCH_OP_COMM) ||
+ parg->count) {
/*
* IMM and COMM is pointing actual address, those must
* be kept, and if parg->count != 0, this is an array
*/
code++;
if (code->op != FETCH_OP_NOP) {
- ret = -E2BIG;
+ trace_probe_log_err(offset, TOO_MANY_OPS);
+ ret = -EINVAL;
goto fail;
}
}
- code->op = FETCH_OP_ST_STRING; /* In DEREF case, replace it */
+ /* If op == DEREF, replace it with STRING */
+ if (!strcmp(parg->type->name, "ustring") ||
+ code->op == FETCH_OP_UDEREF)
+ code->op = FETCH_OP_ST_USTRING;
+ else
+ code->op = FETCH_OP_ST_STRING;
code->size = parg->type->size;
parg->dynamic = true;
} else if (code->op == FETCH_OP_DEREF) {
code->op = FETCH_OP_ST_MEM;
code->size = parg->type->size;
+ } else if (code->op == FETCH_OP_UDEREF) {
+ code->op = FETCH_OP_ST_UMEM;
+ code->size = parg->type->size;
} else {
code++;
if (code->op != FETCH_OP_NOP) {
- ret = -E2BIG;
+ trace_probe_log_err(offset, TOO_MANY_OPS);
+ ret = -EINVAL;
goto fail;
}
code->op = FETCH_OP_ST_RAW;
/* Modify operation */
if (t != NULL) {
ret = __parse_bitfield_probe_arg(t, parg->type, &code);
- if (ret)
+ if (ret) {
+ trace_probe_log_err(offset + t - arg, BAD_BITFIELD);
goto fail;
+ }
}
/* Loop(Array) operation */
if (parg->count) {
if (scode->op != FETCH_OP_ST_MEM &&
- scode->op != FETCH_OP_ST_STRING) {
- pr_info("array only accepts memory or address\n");
+ scode->op != FETCH_OP_ST_STRING &&
+ scode->op != FETCH_OP_ST_USTRING) {
+ trace_probe_log_err(offset + (t ? (t - arg) : 0),
+ BAD_STRING);
ret = -EINVAL;
goto fail;
}
code++;
if (code->op != FETCH_OP_NOP) {
- ret = -E2BIG;
+ trace_probe_log_err(offset, TOO_MANY_OPS);
+ ret = -EINVAL;
goto fail;
}
code->op = FETCH_OP_LP_ARRAY;
code->op = FETCH_OP_END;
/* Shrink down the code buffer */
- parg->code = kzalloc(sizeof(*code) * (code - tmp + 1), GFP_KERNEL);
+ parg->code = kcalloc(code - tmp + 1, sizeof(*code), GFP_KERNEL);
if (!parg->code)
ret = -ENOMEM;
else
{
struct probe_arg *parg = &tp->args[i];
char *body;
- int ret;
/* Increment count for freeing args in error case */
tp->nr_args++;
body = strchr(arg, '=');
if (body) {
- if (body - arg > MAX_ARG_NAME_LEN || body == arg)
+ if (body - arg > MAX_ARG_NAME_LEN) {
+ trace_probe_log_err(0, ARG_NAME_TOO_LONG);
+ return -EINVAL;
+ } else if (body == arg) {
+ trace_probe_log_err(0, NO_ARG_NAME);
return -EINVAL;
+ }
parg->name = kmemdup_nul(arg, body - arg, GFP_KERNEL);
body++;
} else {
return -ENOMEM;
if (!is_good_name(parg->name)) {
- pr_info("Invalid argument[%d] name: %s\n",
- i, parg->name);
+ trace_probe_log_err(0, BAD_ARG_NAME);
return -EINVAL;
}
-
if (traceprobe_conflict_field_name(parg->name, tp->args, i)) {
- pr_info("Argument[%d]: '%s' conflicts with another field.\n",
- i, parg->name);
+ trace_probe_log_err(0, USED_ARG_NAME);
return -EINVAL;
}
-
/* Parse fetch argument */
- ret = traceprobe_parse_probe_arg_body(body, &tp->size, parg, flags);
- if (ret)
- pr_info("Parse error at argument[%d]. (%d)\n", i, ret);
- return ret;
+ return traceprobe_parse_probe_arg_body(body, &tp->size, parg, flags,
+ body - arg);
}
void traceprobe_free_probe_arg(struct probe_arg *arg)
int traceprobe_set_print_fmt(struct trace_probe *tp, bool is_return)
{
+ struct trace_event_call *call = trace_probe_event_call(tp);
int len;
char *print_fmt;
/* Second: actually write the @print_fmt */
__set_print_fmt(tp, print_fmt, len + 1, is_return);
- tp->call.print_fmt = print_fmt;
+ call->print_fmt = print_fmt;
return 0;
}
}
return 0;
}
+
+
+void trace_probe_cleanup(struct trace_probe *tp)
+{
+ struct trace_event_call *call = trace_probe_event_call(tp);
+ int i;
+
+ for (i = 0; i < tp->nr_args; i++)
+ traceprobe_free_probe_arg(&tp->args[i]);
+
+ kfree(call->class->system);
+ kfree(call->name);
+ kfree(call->print_fmt);
+}
+
+int trace_probe_init(struct trace_probe *tp, const char *event,
+ const char *group)
+{
+ struct trace_event_call *call = trace_probe_event_call(tp);
+
+ if (!event || !group)
+ return -EINVAL;
+
+ call->class = &tp->class;
+ call->name = kstrdup(event, GFP_KERNEL);
+ if (!call->name)
+ return -ENOMEM;
+
+ tp->class.system = kstrdup(group, GFP_KERNEL);
+ if (!tp->class.system) {
+ kfree(call->name);
+ call->name = NULL;
+ return -ENOMEM;
+ }
+ INIT_LIST_HEAD(&tp->files);
+ INIT_LIST_HEAD(&tp->class.fields);
+
+ return 0;
+}
+
+int trace_probe_register_event_call(struct trace_probe *tp)
+{
+ struct trace_event_call *call = trace_probe_event_call(tp);
+ int ret;
+
+ ret = register_trace_event(&call->event);
+ if (!ret)
+ return -ENODEV;
+
+ ret = trace_add_event_call(call);
+ if (ret)
+ unregister_trace_event(&call->event);
+
+ return ret;
+}
+
+int trace_probe_add_file(struct trace_probe *tp, struct trace_event_file *file)
+{
+ struct event_file_link *link;
+
+ link = kmalloc(sizeof(*link), GFP_KERNEL);
+ if (!link)
+ return -ENOMEM;
+
+ link->file = file;
+ INIT_LIST_HEAD(&link->list);
+ list_add_tail_rcu(&link->list, &tp->files);
+ trace_probe_set_flag(tp, TP_FLAG_TRACE);
+ return 0;
+}
+
+struct event_file_link *trace_probe_get_file_link(struct trace_probe *tp,
+ struct trace_event_file *file)
+{
+ struct event_file_link *link;
+
+ trace_probe_for_each_link(link, tp) {
+ if (link->file == file)
+ return link;
+ }
+
+ return NULL;
+}
+
+int trace_probe_remove_file(struct trace_probe *tp,
+ struct trace_event_file *file)
+{
+ struct event_file_link *link;
+
+ link = trace_probe_get_file_link(tp, file);
+ if (!link)
+ return -ENOENT;
+
+ list_del_rcu(&link->list);
+ synchronize_rcu();
+ kfree(link);
+
+ if (list_empty(&tp->files))
+ trace_probe_clear_flag(tp, TP_FLAG_TRACE);
+
+ return 0;
+}
projects / linux.git / blobdiff