diff options
author | Oleg Nesterov <oleg@redhat.com> | 2013-03-30 18:46:22 +0100 |
---|---|---|
committer | Oleg Nesterov <oleg@redhat.com> | 2013-04-13 15:32:03 +0200 |
commit | 393a736c280d555d9301fc5516d4d401544eb9db (patch) | |
tree | c0cb3385b47e0ecb38f7199b2a319e704abe9988 /kernel/trace | |
parent | uprobes/tracing: Introduce is_ret_probe() and uretprobe_dispatcher() (diff) | |
download | linux-393a736c280d555d9301fc5516d4d401544eb9db.tar.xz linux-393a736c280d555d9301fc5516d4d401544eb9db.zip |
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>
Diffstat (limited to 'kernel/trace')
-rw-r--r-- | kernel/trace/trace_uprobe.c | 34 |
1 files changed, 25 insertions, 9 deletions
diff --git a/kernel/trace/trace_uprobe.c b/kernel/trace/trace_uprobe.c index 72aa45e50d48..0ed99a27d122 100644 --- a/kernel/trace/trace_uprobe.c +++ b/kernel/trace/trace_uprobe.c @@ -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; } |