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uprobes/tracing: Make uprobe_{trace,perf}_print() uretprobe-friendly 

Change uprobe_trace_print() and uprobe_perf_print() to check
is_ret_probe() and fill ring_buffer_event accordingly.

Also change uprobe_trace_func() and uprobe_perf_func() to not
_print() if is_ret_probe() is true. Note that we keep ->handler()
nontrivial even for uretprobe, we need this for filtering and for
other potential extensions.

Signed-off-by: Oleg Nesterov <oleg@redhat.com>
Acked-by: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
Tested-by: Anton Arapov <anton@redhat.com>
This commit is contained in:
Oleg Nesterov 2013-03-30 18:46:22 +01:00
parent c1ae5c75e1
commit 393a736c28
1 changed files with 25 additions and 9 deletions
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34
kernel/trace/trace_uprobe.c
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@ -516,15 +516,22 @@ static void uprobe_trace_print(struct trace_uprobe *tu,
int size, i;
struct ftrace_event_call *call = &tu->call;
size = SIZEOF_TRACE_ENTRY(false) + tu->size;
size = SIZEOF_TRACE_ENTRY(is_ret_probe(tu));
event = trace_current_buffer_lock_reserve(&buffer, call->event.type,
size, 0, 0);
size + tu->size, 0, 0);
if (!event)
return;
entry = ring_buffer_event_data(event);
entry->vaddr[0] = instruction_pointer(regs);
data = DATAOF_TRACE_ENTRY(entry, false);
if (is_ret_probe(tu)) {
entry->vaddr[0] = func;
entry->vaddr[1] = instruction_pointer(regs);
data = DATAOF_TRACE_ENTRY(entry, true);
} else {
entry->vaddr[0] = instruction_pointer(regs);
data = DATAOF_TRACE_ENTRY(entry, false);
}
for (i = 0; i < tu->nr_args; i++)
call_fetch(&tu->args[i].fetch, regs, data + tu->args[i].offset);
@ -535,7 +542,8 @@ static void uprobe_trace_print(struct trace_uprobe *tu,
/* uprobe handler */
static int uprobe_trace_func(struct trace_uprobe *tu, struct pt_regs *regs)
{
uprobe_trace_print(tu, 0, regs);
if (!is_ret_probe(tu))
uprobe_trace_print(tu, 0, regs);
return 0;
}
@ -784,7 +792,7 @@ static void uprobe_perf_print(struct trace_uprobe *tu,
void *data;
int size, rctx, i;
size = SIZEOF_TRACE_ENTRY(false);
size = SIZEOF_TRACE_ENTRY(is_ret_probe(tu));
size = ALIGN(size + tu->size + sizeof(u32), sizeof(u64)) - sizeof(u32);
if (WARN_ONCE(size > PERF_MAX_TRACE_SIZE, "profile buffer not large enough"))
return;
@ -795,8 +803,15 @@ static void uprobe_perf_print(struct trace_uprobe *tu,
goto out;
ip = instruction_pointer(regs);
entry->vaddr[0] = ip;
data = DATAOF_TRACE_ENTRY(entry, false);
if (is_ret_probe(tu)) {
entry->vaddr[0] = func;
entry->vaddr[1] = ip;
data = DATAOF_TRACE_ENTRY(entry, true);
} else {
entry->vaddr[0] = ip;
data = DATAOF_TRACE_ENTRY(entry, false);
}
for (i = 0; i < tu->nr_args; i++)
call_fetch(&tu->args[i].fetch, regs, data + tu->args[i].offset);
@ -812,7 +827,8 @@ static int uprobe_perf_func(struct trace_uprobe *tu, struct pt_regs *regs)
if (!uprobe_perf_filter(&tu->consumer, 0, current->mm))
return UPROBE_HANDLER_REMOVE;
uprobe_perf_print(tu, 0, regs);
if (!is_ret_probe(tu))
uprobe_perf_print(tu, 0, regs);
return 0;
}