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MIPS: Tracing: Fix argument passing of the 32bit support with gcc 4.5

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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>
This commit is contained in:
Wu Zhangjin 2010-05-14 19:08:29 +08:00 committed by Ralf Baechle
parent 042e571d22
commit 56b49cd35f
1 changed files with 9 additions and 3 deletions
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12
arch/mips/kernel/mcount.S
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@ -57,6 +57,12 @@
move ra, AT
.endm
/*
* The -mmcount-ra-address option of gcc 4.5 uses register $12 to pass
* the location of the parent's return address.
*/
#define MCOUNT_RA_ADDRESS_REG $12
#ifdef CONFIG_DYNAMIC_FTRACE
NESTED(ftrace_caller, PT_SIZE, ra)
@ -70,7 +76,7 @@ _mcount:
MCOUNT_SAVE_REGS
#ifdef KBUILD_MCOUNT_RA_ADDRESS
PTR_S t0, PT_R12(sp) /* save location of parent's return address */
PTR_S MCOUNT_RA_ADDRESS_REG, PT_R12(sp)
#endif
move a0, ra /* arg1: self return address */
@ -142,9 +148,9 @@ NESTED(ftrace_graph_caller, PT_SIZE, ra)
#ifdef CONFIG_DYNAMIC_FTRACE
PTR_L a0, PT_R12(sp)
#else
move a0, t0
move a0, MCOUNT_RA_ADDRESS_REG
#endif
bnez a0, 1f /* non-leaf func: stored in t0 */
bnez a0, 1f /* non-leaf func: stored in MCOUNT_RA_ADDRESS_REG */
nop
#endif
PTR_LA a0, PT_R1(sp) /* leaf func: the location in current stack */