diff options
Diffstat (limited to 'kernel/trace/trace_probe.c')
| -rw-r--r-- | kernel/trace/trace_probe.c | 142 |
1 files changed, 132 insertions, 10 deletions
diff --git a/kernel/trace/trace_probe.c b/kernel/trace/trace_probe.c index a347faced959..dbef0d135075 100644 --- a/kernel/trace/trace_probe.c +++ b/kernel/trace/trace_probe.c @@ -78,6 +78,8 @@ static const struct fetch_type probe_fetch_types[] = { /* 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), @@ -322,6 +324,7 @@ parse_probe_arg(char *arg, const struct fetch_type *type, { struct fetch_insn *code = *pcode; unsigned long param; + int deref = FETCH_OP_DEREF; long offset = 0; char *tmp; int ret = 0; @@ -394,9 +397,14 @@ parse_probe_arg(char *arg, const struct fetch_type *type, 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) { trace_probe_log_err(offs, DEREF_NEED_BRACE); @@ -432,7 +440,7 @@ parse_probe_arg(char *arg, const struct fetch_type *type, } *pcode = code; - code->op = FETCH_OP_DEREF; + code->op = deref; code->offset = offset; } break; @@ -569,15 +577,17 @@ static int traceprobe_parse_probe_arg_body(char *arg, ssize_t *size, 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) { + 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 @@ -590,12 +600,20 @@ static int traceprobe_parse_probe_arg_body(char *arg, ssize_t *size, 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) { @@ -618,7 +636,8 @@ static int traceprobe_parse_probe_arg_body(char *arg, ssize_t *size, /* Loop(Array) operation */ if (parg->count) { if (scode->op != FETCH_OP_ST_MEM && - scode->op != FETCH_OP_ST_STRING) { + 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; @@ -825,6 +844,7 @@ static int __set_print_fmt(struct trace_probe *tp, char *buf, int len, 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; @@ -836,7 +856,7 @@ int traceprobe_set_print_fmt(struct trace_probe *tp, bool is_return) /* 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; } @@ -865,3 +885,105 @@ int traceprobe_define_arg_fields(struct trace_event_call *event_call, } 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; +} |