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tracing/fprobe: Enable fprobe events with CONFIG_DYNAMIC_FTRACE_WITH_ARGS

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Allow fprobe events to be enabled with CONFIG_DYNAMIC_FTRACE_WITH_ARGS.
With this change, fprobe events mostly use ftrace_regs instead of pt_regs.
Note that if the arch doesn't enable HAVE_FTRACE_REGS_HAVING_PT_REGS,
fprobe events will not be able to be used from perf.

Cc: Alexei Starovoitov <alexei.starovoitov@gmail.com>
Cc: Florent Revest <revest@chromium.org>
Cc: Martin KaFai Lau <martin.lau@linux.dev>
Cc: bpf <bpf@vger.kernel.org>
Cc: Alexei Starovoitov <ast@kernel.org>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Alan Maguire <alan.maguire@oracle.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Link: https://lore.kernel.org/173518999352.391279.13332699755290175168.stgit@devnote2
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)
2024-12-26 14:13:13 +09:00
committed by Steven Rostedt (Google)
parent d5d01b7199
commit 0566cefe73
4 changed files with 86 additions and 42 deletions
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17
include/linux/ftrace.h
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@@ -250,6 +250,23 @@ static __always_inline bool ftrace_regs_has_args(struct ftrace_regs *fregs)
return ftrace_get_regs(fregs) != NULL;
}
#ifdef CONFIG_HAVE_REGS_AND_STACK_ACCESS_API
static __always_inline unsigned long
ftrace_regs_get_kernel_stack_nth(struct ftrace_regs *fregs, unsigned int nth)
{
unsigned long *stackp;
stackp = (unsigned long *)ftrace_regs_get_stack_pointer(fregs);
if (((unsigned long)(stackp + nth) & ~(THREAD_SIZE - 1)) ==
((unsigned long)stackp & ~(THREAD_SIZE - 1)))
return *(stackp + nth);
return 0;
}
#else /* !CONFIG_HAVE_REGS_AND_STACK_ACCESS_API */
#define ftrace_regs_get_kernel_stack_nth(fregs, nth) (0L)
#endif /* CONFIG_HAVE_REGS_AND_STACK_ACCESS_API */
typedef void (*ftrace_func_t)(unsigned long ip, unsigned long parent_ip,
struct ftrace_ops *op, struct ftrace_regs *fregs);