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authorHelge Deller <deller@gmx.de>2009-02-09 00:43:36 +0100
committerKyle McMartin <kyle@mcmartin.ca>2009-03-31 02:51:34 +0000
commitd75f054a2cf0614ff63d534ff21ca8eaab41e713 (patch)
treee1fbea035711abf72099ebd01918f5ba3c3cf9ae /arch/parisc/kernel/entry.S
parent803094f480aa5b7dd5187a17e6e60ff24721c212 (diff)
parisc: add ftrace (function and graph tracer) functionality
This patch adds the ftrace debugging functionality to the parisc kernel. It will currently only work with 64bit kernels, because the gcc options -pg and -ffunction-sections can't be enabled at the same time and -ffunction-sections is still needed to be able to link 32bit kernels. Signed-off-by: Helge Deller <deller@gmx.de> Signed-off-by: Kyle McMartin <kyle@mcmartin.ca>
Diffstat (limited to 'arch/parisc/kernel/entry.S')
-rw-r--r--arch/parisc/kernel/entry.S27
1 files changed, 27 insertions, 0 deletions
diff --git a/arch/parisc/kernel/entry.S b/arch/parisc/kernel/entry.S
index 4e9dd15e076..ae3e70cd1e1 100644
--- a/arch/parisc/kernel/entry.S
+++ b/arch/parisc/kernel/entry.S
@@ -2185,6 +2185,33 @@ syscall_do_resched:
ENDPROC(syscall_exit)
+#ifdef CONFIG_FUNCTION_TRACER
+ .import ftrace_function_trampoline,code
+ENTRY(_mcount)
+ copy %r3, %arg2
+ b ftrace_function_trampoline
+ nop
+ENDPROC(_mcount)
+
+ENTRY(return_to_handler)
+ load32 return_trampoline, %rp
+ copy %ret0, %arg0
+ copy %ret1, %arg1
+ b ftrace_return_to_handler
+ nop
+return_trampoline:
+ copy %ret0, %rp
+ copy %r23, %ret0
+ copy %r24, %ret1
+
+.globl ftrace_stub
+ftrace_stub:
+ bv %r0(%rp)
+ nop
+ENDPROC(return_to_handler)
+#endif /* CONFIG_FUNCTION_TRACER */
+
+
get_register:
/*
* get_register is used by the non access tlb miss handlers to