powerpc32, ftrace: save and restore mcount regs with macro
Impact: clean up
Use a macro to save and restore the registers for PowerPC32,
since that code is duplicated.
This is similar to the work done by Cyrill Gorcunov for the
mcount code in x86_64.
Acked-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
diff --git a/arch/powerpc/include/asm/ftrace.h b/arch/powerpc/include/asm/ftrace.h
index e5f2ae8..dde1296 100644
--- a/arch/powerpc/include/asm/ftrace.h
+++ b/arch/powerpc/include/asm/ftrace.h
@@ -5,7 +5,44 @@
#define MCOUNT_ADDR ((long)(_mcount))
#define MCOUNT_INSN_SIZE 4 /* sizeof mcount call */
-#ifndef __ASSEMBLY__
+#ifdef __ASSEMBLY__
+
+/* Based off of objdump optput from glibc */
+
+#define MCOUNT_SAVE_FRAME \
+ stwu r1,-48(r1); \
+ stw r3, 12(r1); \
+ stw r4, 16(r1); \
+ stw r5, 20(r1); \
+ stw r6, 24(r1); \
+ mflr r3; \
+ lwz r4, 52(r1); \
+ mfcr r5; \
+ stw r7, 28(r1); \
+ stw r8, 32(r1); \
+ stw r9, 36(r1); \
+ stw r10,40(r1); \
+ stw r3, 44(r1); \
+ stw r5, 8(r1)
+
+#define MCOUNT_RESTORE_FRAME \
+ lwz r6, 8(r1); \
+ lwz r0, 44(r1); \
+ lwz r3, 12(r1); \
+ mtctr r0; \
+ lwz r4, 16(r1); \
+ mtcr r6; \
+ lwz r5, 20(r1); \
+ lwz r6, 24(r1); \
+ lwz r0, 52(r1); \
+ lwz r7, 28(r1); \
+ lwz r8, 32(r1); \
+ mtlr r0; \
+ lwz r9, 36(r1); \
+ lwz r10,40(r1); \
+ addi r1, r1, 48
+
+#else /* !__ASSEMBLY__ */
extern void _mcount(void);
#ifdef CONFIG_DYNAMIC_FTRACE