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Re: [PATCH] ARM: Add SystemTap probes to longjmp and setjmp.
- From: "Joseph S. Myers" <joseph at codesourcery dot com>
- To: Will Newton <will dot newton at linaro dot org>
- Cc: <libc-ports at sourceware dot org>, <patches at linaro dot org>
- Date: Tue, 28 Jan 2014 21:35:02 +0000
- Subject: Re: [PATCH] ARM: Add SystemTap probes to longjmp and setjmp.
- Authentication-results: sourceware.org; auth=none
- References: <1390815426-10792-1-git-send-email-will dot newton at linaro dot org>
On Mon, 27 Jan 2014, Will Newton wrote:
> @@ -50,6 +48,11 @@ ENTRY (__longjmp)
> ldr sp, [ip], #4
> ldr lr, [ip], #4
> #endif
> + /* longjmp probe expects longjmp first argument (4@r0), second
> + argument (-4@r1), and target address (4@r14), respectively. */
> + LIBC_PROBE (longjmp, 3, 4@r0, -4@r1, 4@r14)
The discussion on libc-alpha said this probe should be before unwinding;
shouldn't that mean before sp and lr are restored, so that at probe time
it's still possible to unwind through the caller of longjmp?
--
Joseph S. Myers
joseph@codesourcery.com