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author | David S. Miller <davem@davemloft.net> | 2010-04-07 11:41:33 (GMT) |
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committer | David S. Miller <davem@davemloft.net> | 2010-04-13 05:37:26 (GMT) |
commit | 9960e9e8944f9b1ca6af5f7d26400ca45b429600 (patch) | |
tree | 2483b4c55f54663a8cc358fae5837e7d8232c554 /arch/sparc/kernel/ftrace.c | |
parent | a71d1d6bb1b26e566e5c06c37857f4cdc1664780 (diff) | |
download | linux-fsl-qoriq-9960e9e8944f9b1ca6af5f7d26400ca45b429600.tar.xz |
sparc64: Add function graph tracer support.
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'arch/sparc/kernel/ftrace.c')
-rw-r--r-- | arch/sparc/kernel/ftrace.c | 58 |
1 files changed, 58 insertions, 0 deletions
diff --git a/arch/sparc/kernel/ftrace.c b/arch/sparc/kernel/ftrace.c index 2ea6e4f..03ab022 100644 --- a/arch/sparc/kernel/ftrace.c +++ b/arch/sparc/kernel/ftrace.c @@ -91,3 +91,61 @@ int __init ftrace_dyn_arch_init(void *data) return 0; } #endif + +#ifdef CONFIG_FUNCTION_GRAPH_TRACER + +#ifdef CONFIG_DYNAMIC_FTRACE +extern void ftrace_graph_call(void); + +int ftrace_enable_ftrace_graph_caller(void) +{ + unsigned long ip = (unsigned long)(&ftrace_graph_call); + u32 old, new; + + old = *(u32 *) &ftrace_graph_call; + new = ftrace_call_replace(ip, (unsigned long) &ftrace_graph_caller); + return ftrace_modify_code(ip, old, new); +} + +int ftrace_disable_ftrace_graph_caller(void) +{ + unsigned long ip = (unsigned long)(&ftrace_graph_call); + u32 old, new; + + old = *(u32 *) &ftrace_graph_call; + new = ftrace_call_replace(ip, (unsigned long) &ftrace_stub); + + return ftrace_modify_code(ip, old, new); +} + +#endif /* !CONFIG_DYNAMIC_FTRACE */ + +/* + * Hook the return address and push it in the stack of return addrs + * in current thread info. + */ +unsigned long prepare_ftrace_return(unsigned long parent, + unsigned long self_addr, + unsigned long frame_pointer) +{ + unsigned long return_hooker = (unsigned long) &return_to_handler; + struct ftrace_graph_ent trace; + + if (unlikely(atomic_read(¤t->tracing_graph_pause))) + return parent + 8UL; + + if (ftrace_push_return_trace(parent, self_addr, &trace.depth, + frame_pointer) == -EBUSY) + return parent + 8UL; + + trace.func = self_addr; + + /* Only trace if the calling function expects to */ + if (!ftrace_graph_entry(&trace)) { + current->curr_ret_stack--; + return parent + 8UL; + } + + return return_hooker; +} +#endif /* CONFIG_FUNCTION_GRAPH_TRACER */ |