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| author | Michal Simek <monstr@monstr.eu> | 2009-11-16 10:32:10 +0100 |
|---|---|---|
| committer | Michal Simek <monstr@monstr.eu> | 2009-12-14 08:44:53 +0100 |
| commit | a0d3e66522e8f6119f002cf31e5d92d7ae73b409 (patch) | |
| tree | 717d36ef5a2e103669403011317a88b1af84c9d3 /arch/microblaze/kernel/mcount.S | |
| parent | 7d241ff0567b9503d79ee775c40927d09b509f83 (diff) | |
| download | lwn-a0d3e66522e8f6119f002cf31e5d92d7ae73b409.tar.gz lwn-a0d3e66522e8f6119f002cf31e5d92d7ae73b409.zip | |
microblaze: ftrace: add function graph support
For more information look at Documentation/trace folder.
Signed-off-by: Michal Simek <monstr@monstr.eu>
Diffstat (limited to 'arch/microblaze/kernel/mcount.S')
| -rw-r--r-- | arch/microblaze/kernel/mcount.S | 41 |
1 files changed, 41 insertions, 0 deletions
diff --git a/arch/microblaze/kernel/mcount.S b/arch/microblaze/kernel/mcount.S index 30aaf8fb55b2..84a19458c74d 100644 --- a/arch/microblaze/kernel/mcount.S +++ b/arch/microblaze/kernel/mcount.S @@ -96,6 +96,27 @@ ENTRY(ftrace_caller) bneid r5, end; nop; /* MS: HAVE_FUNCTION_TRACE_MCOUNT_TEST end of checking */ +#ifdef CONFIG_FUNCTION_GRAPH_TRACER + lwi r5, r0, ftrace_graph_return; + addik r6, r0, ftrace_stub; /* asm implementation */ + cmpu r5, r5, r6; /* ftrace_graph_return != ftrace_stub */ + beqid r5, end_graph_tracer; + nop; + + lwi r6, r0, ftrace_graph_entry; + addik r5, r0, ftrace_graph_entry_stub; /* implemented in C */ + cmpu r5, r5, r6; /* ftrace_graph_entry != ftrace_graph_entry_stub */ + beqid r5, end_graph_tracer; + nop; + addik r5, r1, 120; /* MS: load parent addr */ + addik r6, r15, 0; /* MS: load current function addr */ + bralid r15, prepare_ftrace_return; + nop; + /* MS: graph was taken that's why - can jump over function trace */ + brid end; + nop; +end_graph_tracer: +#endif /* CONFIG_FUNCTION_GRAPH_TRACER */ #ifndef CONFIG_DYNAMIC_FTRACE /* MS: test function trace if is taken or not */ lwi r20, r0, ftrace_trace_function; @@ -121,3 +142,23 @@ end: rtsd r15, 8; /* MS: jump back */ nop; + +#ifdef CONFIG_FUNCTION_GRAPH_TRACER +ENTRY(return_to_handler) + nop; /* MS: just barrier for rtsd r15, 8 */ + nop; + SAVE_REGS + swi r15, r1, 0; + + /* MS: find out returning address */ + bralid r15, ftrace_return_to_handler; + nop; + + /* MS: return value from ftrace_return_to_handler is my returning addr + * must be before restore regs because I have to restore r3 content */ + addik r15, r3, 0; + RESTORE_REGS + + rtsd r15, 8; /* MS: jump back */ + nop; +#endif /* CONFIG_FUNCTION_TRACER */ |