ftrace: support for PowerPC
This patch adds full support for ftrace for PowerPC (both 64 and 32 bit).
This includes dynamic tracing and function filtering.
Signed-off-by: Steven Rostedt <srostedt@redhat.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
diff --git a/arch/powerpc/kernel/entry_32.S b/arch/powerpc/kernel/entry_32.S
index 0c8614d..0e62218 100644
--- a/arch/powerpc/kernel/entry_32.S
+++ b/arch/powerpc/kernel/entry_32.S
@@ -1035,3 +1035,133 @@
/* XXX load up BATs and panic */
#endif /* CONFIG_PPC_RTAS */
+
+#ifdef CONFIG_FTRACE
+#ifdef CONFIG_DYNAMIC_FTRACE
+_GLOBAL(mcount)
+_GLOBAL(_mcount)
+ stwu r1,-48(r1)
+ stw r3, 12(r1)
+ stw r4, 16(r1)
+ stw r5, 20(r1)
+ stw r6, 24(r1)
+ mflr r3
+ stw r7, 28(r1)
+ mfcr r5
+ stw r8, 32(r1)
+ stw r9, 36(r1)
+ stw r10,40(r1)
+ stw r3, 44(r1)
+ stw r5, 8(r1)
+ .globl mcount_call
+mcount_call:
+ bl ftrace_stub
+ nop
+ 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
+ bctr
+
+_GLOBAL(ftrace_caller)
+ /* Based off of objdump optput from glibc */
+ 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)
+.globl ftrace_call
+ftrace_call:
+ bl ftrace_stub
+ nop
+ 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
+ bctr
+#else
+_GLOBAL(mcount)
+_GLOBAL(_mcount)
+ 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)
+
+ LOAD_REG_ADDR(r5, ftrace_trace_function)
+#if 0
+ mtctr r3
+ mr r1, r5
+ bctrl
+#endif
+ lwz r5,0(r5)
+#if 1
+ mtctr r5
+ bctrl
+#else
+ bl ftrace_stub
+#endif
+ nop
+
+ 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
+ bctr
+#endif
+
+_GLOBAL(ftrace_stub)
+ blr
+
+#endif /* CONFIG_MCOUNT */