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tracing/uprobes: Add support for full argument access methods 

Enable to fetch other types of argument for the uprobes.  IOW, we can
access stack, memory, deref, bitfield and retval from uprobes now.

The format for the argument types are same as kprobes (but @SYMBOL
type is not supported for uprobes), i.e:

  @ADDR   : Fetch memory at ADDR
  $stackN : Fetch Nth entry of stack (N >= 0)
  $stack  : Fetch stack address
  $retval : Fetch return value
  +|-offs(FETCHARG) : Fetch memory at FETCHARG +|- offs address

Note that the retval only can be used with uretprobes.

Original-patch-by: Hyeoncheol Lee <cheol.lee@lge.com>
Acked-by: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Acked-by: Oleg Nesterov <oleg@redhat.com>
Cc: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: zhangwei(Jovi) <jovi.zhangwei@huawei.com>
Cc: Arnaldo Carvalho de Melo <acme@ghostprotocols.net>
Signed-off-by: Hyeoncheol Lee <cheol.lee@lge.com>
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
hifive-unleashed-5.1
Namhyung Kim 2013-07-03 18:34:23 +09:00 committed by Steven Rostedt
parent dcad1a204f
commit b079d374fd
2 changed files with 47 additions and 12 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

25
Documentation/trace/uprobetracer.txt
View File

@ -31,6 +31,31 @@ Synopsis of uprobe_tracer
FETCHARGS : Arguments. Each probe can have up to 128 args.
%REG : Fetch register REG
@ADDR : Fetch memory at ADDR (ADDR should be in userspace)
$stackN : Fetch Nth entry of stack (N >= 0)
$stack : Fetch stack address.
$retval : Fetch return value.(*)
+|-offs(FETCHARG) : Fetch memory at FETCHARG +|- offs address.(**)
NAME=FETCHARG : Set NAME as the argument name of FETCHARG.
FETCHARG:TYPE : Set TYPE as the type of FETCHARG. Currently, basic types
(u8/u16/u32/u64/s8/s16/s32/s64), "string" and bitfield
are supported.
(*) only for return probe.
(**) this is useful for fetching a field of data structures.
Types
-----
Several types are supported for fetch-args. Uprobe tracer will access memory
by given type. Prefix 's' and 'u' means those types are signed and unsigned
respectively. Traced arguments are shown in decimal (signed) or hex (unsigned).
String type is a special type, which fetches a "null-terminated" string from
user space.
Bitfield is another special type, which takes 3 parameters, bit-width, bit-
offset, and container-size (usually 32). The syntax is;
b<bit-width>@<bit-offset>/<container-size>
Event Profiling
---------------

34
kernel/trace/trace_probe.c
View File

@ -255,12 +255,18 @@ fail:
}
/* Special function : only accept unsigned long */
static __kprobes void fetch_stack_address(struct pt_regs *regs,
void *dummy, void *dest)
static __kprobes void fetch_kernel_stack_address(struct pt_regs *regs,
void *dummy, void *dest)
{
*(unsigned long *)dest = kernel_stack_pointer(regs);
}
static __kprobes void fetch_user_stack_address(struct pt_regs *regs,
void *dummy, void *dest)
{
*(unsigned long *)dest = user_stack_pointer(regs);
}
static fetch_func_t get_fetch_size_function(const struct fetch_type *type,
fetch_func_t orig_fn,
const struct fetch_type *ftbl)
@ -305,7 +311,8 @@ int traceprobe_split_symbol_offset(char *symbol, unsigned long *offset)
#define PARAM_MAX_STACK (THREAD_SIZE / sizeof(unsigned long))
static int parse_probe_vars(char *arg, const struct fetch_type *t,
struct fetch_param *f, bool is_return)
struct fetch_param *f, bool is_return,
bool is_kprobe)
{
int ret = 0;
unsigned long param;
@ -317,13 +324,16 @@ static int parse_probe_vars(char *arg, const struct fetch_type *t,
ret = -EINVAL;
} else if (strncmp(arg, "stack", 5) == 0) {
if (arg[5] == '\0') {
if (strcmp(t->name, DEFAULT_FETCH_TYPE_STR) == 0)
f->fn = fetch_stack_address;
if (strcmp(t->name, DEFAULT_FETCH_TYPE_STR))
return -EINVAL;
if (is_kprobe)
f->fn = fetch_kernel_stack_address;
else
ret = -EINVAL;
f->fn = fetch_user_stack_address;
} else if (isdigit(arg[5])) {
ret = kstrtoul(arg + 5, 10, &param);
if (ret || param > PARAM_MAX_STACK)
if (ret || (is_kprobe && param > PARAM_MAX_STACK))
ret = -EINVAL;
else {
f->fn = t->fetch[FETCH_MTD_stack];
@ -350,13 +360,9 @@ static int parse_probe_arg(char *arg, const struct fetch_type *t,
ftbl = is_kprobe ? kprobes_fetch_type_table : uprobes_fetch_type_table;
BUG_ON(ftbl == NULL);
/* Until uprobe_events supports only reg arguments */
if (!is_kprobe && arg[0] != '%')
return -EINVAL;
switch (arg[0]) {
case '$':
ret = parse_probe_vars(arg + 1, t, f, is_return);
ret = parse_probe_vars(arg + 1, t, f, is_return, is_kprobe);
break;
case '%': /* named register */
@ -377,6 +383,10 @@ static int parse_probe_arg(char *arg, const struct fetch_type *t,
f->fn = t->fetch[FETCH_MTD_memory];
f->data = (void *)param;
} else {
/* uprobes don't support symbols */
if (!is_kprobe)
return -EINVAL;
ret = traceprobe_split_symbol_offset(arg + 1, &offset);
if (ret)
break;