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fprobe: Pass entry_data to handlers

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Pass the private entry_data to the entry and exit handlers so that
they can share the context data, something like saved function
arguments etc.
User must specify the private entry_data size by @entry_data_size
field before registering the fprobe.

Link: https://lkml.kernel.org/r/167526696173.433354.17408372048319432574.stgit@mhiramat.roam.corp.google.com

Cc: Florent Revest <revest@chromium.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Will Deacon <will@kernel.org>
Signed-off-by: Masami Hiramatsu (Google) <mhiramat@kernel.org>
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
This commit is contained in:
Masami Hiramatsu (Google)
2023-02-02 00:56:01 +09:00
committed by Steven Rostedt (Google)
parent e11b521a7b
commit 76d0de5729
5 changed files with 29 additions and 14 deletions
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6
samples/fprobe/fprobe_example.c
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@@ -48,7 +48,8 @@ static void show_backtrace(void)
stack_trace_print(stacks, len, 24);
}
static void sample_entry_handler(struct fprobe *fp, unsigned long ip, struct pt_regs *regs)
static void sample_entry_handler(struct fprobe *fp, unsigned long ip,
struct pt_regs *regs, void *data)
{
if (use_trace)
/*
@@ -63,7 +64,8 @@ static void sample_entry_handler(struct fprobe *fp, unsigned long ip, struct pt_
show_backtrace();
}
static void sample_exit_handler(struct fprobe *fp, unsigned long ip, struct pt_regs *regs)
static void sample_exit_handler(struct fprobe *fp, unsigned long ip, struct pt_regs *regs,
void *data)
{
unsigned long rip = instruction_pointer(regs);