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authorWu Zhangjin <wuzhangjin@gmail.com>2010-05-14 19:08:30 +0800
committerRalf Baechle <ralf@linux-mips.org>2010-07-05 17:17:28 +0100
commit3a2af2dc1bcbfe86b1f39e9e5f9c2c5447943f16 (patch)
tree3c94d93dadcf93ffea7881a7ba0e5a84bda355a3 /arch/mips
parent56b49cd35fd56e29adb8f97ba051a1670d24d133 (diff)
downloadlinux-3a2af2dc1bcbfe86b1f39e9e5f9c2c5447943f16.tar.bz2
MIPS: Tracing: Fix 32-bit support with -mmcount-ra-address
For 32-bit kernel the -mmcount-ra-address option of gcc 4.5 emits one extra instruction before calling to _mcount so we need to use a different "b 1f" for it. 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/1228/ Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Diffstat (limited to 'arch/mips')
-rw-r--r--arch/mips/kernel/ftrace.c16
1 files changed, 14 insertions, 2 deletions
diff --git a/arch/mips/kernel/ftrace.c b/arch/mips/kernel/ftrace.c
index e9e64e0ff7aa..37aa7677e76d 100644
--- a/arch/mips/kernel/ftrace.c
+++ b/arch/mips/kernel/ftrace.c
@@ -62,14 +62,26 @@ int ftrace_make_nop(struct module *mod,
return -EFAULT;
}
+#if defined(KBUILD_MCOUNT_RA_ADDRESS) && defined(CONFIG_32BIT)
+ /* lui v1, hi_16bit_of_mcount --> b 1f (0x10000005)
+ * addiu v1, v1, low_16bit_of_mcount
+ * move at, ra
+ * move $12, ra_address
+ * jalr v1
+ * sub sp, sp, 8
+ * 1: offset = 5 instructions
+ */
+ new = 0x10000005;
+#else
/* lui v1, hi_16bit_of_mcount --> b 1f (0x10000004)
* addiu v1, v1, low_16bit_of_mcount
* move at, ra
* jalr v1
- * nop
- * 1f: (ip + 12)
+ * nop | move $12, ra_address | sub sp, sp, 8
+ * 1: offset = 4 instructions
*/
new = 0x10000004;
+#endif
} else {
/* record/calculate it for ftrace_make_call */
if (jal_mcount == 0) {