MIPS: Tracing: Fix argument passing of the 32bit support with gcc 4.5
authorWu Zhangjin <wuzhangjin@gmail.com>
Fri, 14 May 2010 11:08:29 +0000 (19:08 +0800)
committerRalf Baechle <ralf@linux-mips.org>
Mon, 5 Jul 2010 16:17:28 +0000 (17:17 +0100)
commit56b49cd35fd56e29adb8f97ba051a1670d24d133
tree4c7d6ef25e414141721c8cd31f9582513f0f15ef
parent042e571d224707b777d0995317c74812b960bfeb
MIPS: Tracing: Fix argument passing of the 32bit support with gcc 4.5

As documented in the GCC 4.5 docs [1] -mmcount-ra-address uses register
$12 to pass the stack offset of the return address to the _mcount function.
On 64-bit kernels $12 is t0 but in 32-bit kernels it is t4 so we need to
use $12 instead of t0 here to be correct for both kernel types.

[1] GCC documentation: MIPS Options
http://gcc.gnu.org/onlinedocs/gcc/MIPS-Options.html

Signed-off-by: Wu Zhangjin <wuzhangjin@gmail.com>
Cc: linux-mips <linux-mips@linux-mips.org>
Cc: David Daney <david.s.daney@gmail.com>
Patchwork: http://patchwork.linux-mips.org/patch/1227/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
arch/mips/kernel/mcount.S