From: rabin@rab.in (Rabin Vincent)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH 06/10] ARM: ftrace: add Thumb-2 support
Date: Tue, 16 Mar 2010 00:02:58 +0530 [thread overview]
Message-ID: <20100315183258.GA2141@debian> (raw)
In-Reply-To: <1268605815.2168.6.camel@e102109-lin.cambridge.arm.com>
On Sun, Mar 14, 2010 at 10:30:15PM +0000, Catalin Marinas wrote:
> On Sat, 2010-03-13 at 06:49 +0000, Rabin Vincent wrote:
> > - The problem with the "mov lr, pc", is that it does not set the lsb when
> > storing the pc in lr. The called function returns with "bx lr", and the
> > mode changes to ARM. The blx is to avoid this.
>
> I'm not familiar with ftrace but why does the called function returns
> using "bx lr". Is this generated by the compiler? I had the impression
> that if we don't enable interworking, we wouldn't get this instruction
> (but haven't tried this yet).
There's nothing special about the called function: it's just a regular C
function. GCC uses "bx lr" for the return.
Rabin
next prev parent reply other threads:[~2010-03-15 18:32 UTC|newest]
Thread overview: 41+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-03-13 6:49 [PATCH 00/10] ARM: ftrace: cleanups, Thumb-2, and dynamic ftrace (v2) Rabin Vincent
2010-03-13 6:49 ` [PATCH 01/10] ARM: ftrace: clean up mcount assembly indentation Rabin Vincent
2010-03-13 6:49 ` [PATCH 02/10] ARM: ftrace: document mcount formats Rabin Vincent
2010-03-13 6:49 ` [PATCH 03/10] ftrace: allow building without frame pointers Rabin Vincent
2010-03-13 17:36 ` Steven Rostedt
2010-03-15 18:45 ` Rabin Vincent
2010-03-14 16:56 ` Steven Rostedt
2010-03-13 6:49 ` [PATCH 04/10] ARM: " Rabin Vincent
2010-03-13 17:38 ` Steven Rostedt
2010-03-14 16:56 ` Steven Rostedt
2010-03-17 16:16 ` Catalin Marinas
2010-03-13 6:49 ` [PATCH 05/10] ARM: ftrace: add ENDPROC annotations Rabin Vincent
2010-03-13 8:45 ` Russell King - ARM Linux
2010-04-21 19:23 ` Rabin Vincent
2010-08-10 17:07 ` Catalin Marinas
2010-08-10 19:11 ` Rabin Vincent
2010-03-13 6:49 ` [PATCH 06/10] ARM: ftrace: add Thumb-2 support Rabin Vincent
2010-03-14 22:30 ` Catalin Marinas
2010-03-15 18:32 ` Rabin Vincent [this message]
2010-03-16 10:23 ` Catalin Marinas
2010-03-31 18:25 ` Rabin Vincent
2010-04-23 15:37 ` Catalin Marinas
2010-03-13 6:49 ` [PATCH 07/10] ftrace: pass KBUILD_CFLAGS to record_mcount.pl Rabin Vincent
2010-03-13 17:41 ` Steven Rostedt
2010-03-14 16:56 ` Steven Rostedt
2010-03-31 18:45 ` Rabin Vincent
2010-08-03 16:42 ` Rabin Vincent
2010-08-06 15:31 ` Frederic Weisbecker
2010-08-06 20:23 ` Steven Rostedt
2010-08-07 5:33 ` Rabin Vincent
2010-08-07 12:57 ` Steven Rostedt
2010-03-13 6:49 ` [PATCH 08/10] ARM: ftrace: fix and update dynamic ftrace Rabin Vincent
2010-03-13 17:42 ` Steven Rostedt
2010-03-14 16:56 ` Steven Rostedt
2010-03-13 6:49 ` [PATCH 09/10] ARM: ftrace: add Thumb-2 support to " Rabin Vincent
2010-03-13 6:49 ` [PATCH 10/10] ARM: ftrace: enable " Rabin Vincent
2010-04-21 19:26 ` [PATCH 00/10] ARM: ftrace: cleanups, Thumb-2, and dynamic ftrace (v2) Rabin Vincent
-- strict thread matches above, loose matches on Subject: below --
2010-02-13 19:48 [PATCH 06/10] ARM: ftrace: add Thumb-2 support Rabin Vincent
2010-02-13 19:48 [PATCH 00/10] ARM: ftrace: cleanups, Thumb-2, and dynamic ftrace Rabin Vincent
2010-02-13 19:48 ` [PATCH 06/10] ARM: ftrace: add Thumb-2 support Rabin Vincent
2010-02-13 23:27 ` Catalin Marinas
2010-02-14 16:38 ` Rabin Vincent
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