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authorMichal Simek <monstr@monstr.eu>2012-05-07 14:21:02 +0200
committerMichal Simek <monstr@monstr.eu>2012-05-25 06:34:35 +0200
commitd65987a88dc8b182ef933edf93c23cf4233dd8d5 (patch)
treebf89bd10520302bc2de01f4fce13068f8a80daae /arch/microblaze/kernel
parentf397c077e114df07bd2b94a16681a04be8d59dff (diff)
microblaze: ftrace: Pass the first calling instruction for dynamic ftrace
Selftest for dynamic ftrace requres to pass address of the first calling instruction because hash function is calculated from it. ftrace_update_ftrace_func setups pointer to function which is called in _mcount function. trace_selftest is not aware about instruction size (for microblaze 8 - imm and addik) and that's why we have to pass in r5 address of imm not addik which is in r15.12 For more info look at ftrace_ops_list_func/ftrace.c. Signed-off-by: Michal Simek <monstr@monstr.eu>
Diffstat (limited to 'arch/microblaze/kernel')
-rw-r--r--arch/microblaze/kernel/mcount.S2
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/microblaze/kernel/mcount.S b/arch/microblaze/kernel/mcount.S
index e7eaa7a8cbd3..fc1e1322ce4c 100644
--- a/arch/microblaze/kernel/mcount.S
+++ b/arch/microblaze/kernel/mcount.S
@@ -138,7 +138,7 @@ NOALIGN_ENTRY(ftrace_call)
#endif /* CONFIG_DYNAMIC_FTRACE */
/* static normal trace */
lwi r6, r1, 120; /* MS: load parent addr */
- addik r5, r15, 0; /* MS: load current function addr */
+ addik r5, r15, -4; /* MS: load current function addr */
/* MS: here is dependency on previous code */
brald r15, r20; /* MS: jump to ftrace handler */
nop;