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microblaze: ftrace: Pass the first calling instruction for dynamic ftrace

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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>
This commit is contained in:
Michal Simek 2012-05-07 14:21:02 +02:00
parent f397c077e1
commit d65987a88d
1 changed files with 1 additions and 1 deletions
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arch/microblaze/kernel/mcount.S
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@ -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;