[PATCH 06/10] ARM: ftrace: add Thumb-2 support

Catalin Marinas catalin.marinas at arm.com
Sun Mar 14 18:30:15 EDT 2010

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).


More information about the linux-arm-kernel mailing list