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authorFrederic Weisbecker <fweisbec@gmail.com>2009-03-13 15:42:11 +0100
committerIngo Molnar <mingo@elte.hu>2009-03-13 16:57:42 +0100
commitbed1ffca022cc876fb83161d26670e9b5d3cf36b (patch)
treea896c79e9ea1af11f992826f1de7e2ece52fbe33 /include/linux/ftrace.h
parentf58ba100678f421bdcb000a3c71793f432dfab93 (diff)
downloadop-kernel-dev-bed1ffca022cc876fb83161d26670e9b5d3cf36b.zip
op-kernel-dev-bed1ffca022cc876fb83161d26670e9b5d3cf36b.tar.gz
tracing/syscalls: core infrastructure for syscalls tracing, enhancements
Impact: new feature This adds the generic support for syscalls tracing. This is currently exploited through a devoted tracer but other tracing engines can use it. (They just have to play with {start,stop}_ftrace_syscalls() and use the display callbacks unless they want to override them.) The syscalls prototypes definitions are abused here to steal some metadata informations: - syscall name, param types, param names, number of params The syscall addr is not directly saved during this definition because we don't know if its prototype is available in the namespace. But we don't really need it. The arch has just to build a function able to resolve the syscall number to its metadata struct. The current tracer prints the syscall names, parameters names and values (and their types optionally). Currently the value is a raw hex but higher level values diplaying is on my TODO list. Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com> LKML-Reference: <1236955332-10133-2-git-send-email-fweisbec@gmail.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'include/linux/ftrace.h')
-rw-r--r--include/linux/ftrace.h14
1 files changed, 11 insertions, 3 deletions
diff --git a/include/linux/ftrace.h b/include/linux/ftrace.h
index c146c10..6dc1c65 100644
--- a/include/linux/ftrace.h
+++ b/include/linux/ftrace.h
@@ -506,13 +506,21 @@ static inline void trace_hw_branch_oops(void) {}
/*
* A syscall entry in the ftrace syscalls array.
*
- * @syscall_nr: syscall number
+ * @name: name of the syscall
+ * @nb_args: number of parameters it takes
+ * @types: list of types as strings
+ * @args: list of args as strings (args[i] matches types[i])
*/
-struct syscall_trace_entry {
- int syscall_nr;
+struct syscall_metadata {
+ const char *name;
+ int nb_args;
+ const char **types;
+ const char **args;
};
#ifdef CONFIG_FTRACE_SYSCALLS
+extern void arch_init_ftrace_syscalls(void);
+extern struct syscall_metadata *syscall_nr_to_meta(int nr);
extern void start_ftrace_syscalls(void);
extern void stop_ftrace_syscalls(void);
extern void ftrace_syscall_enter(struct pt_regs *regs);
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