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authorMasami Hiramatsu <mhiramat@redhat.com>2009-10-08 17:17:38 -0400
committerFrederic Weisbecker <fweisbec@gmail.com>2009-10-12 23:31:52 +0200
commit4ea42b181434bfc6a0a18d32214130a242d489bf (patch)
tree2c467d795d90440e0293951087c41caca8397584 /tools/perf/util/probe-finder.h
parente93f4d8539d5e9dd59f4af9d8ef4e9b62cfa1f81 (diff)
perf: Add perf probe subcommand, a kprobe-event setup helper
Add perf probe subcommand that implements a kprobe-event setup helper to the perf command. This allows user to define kprobe events using C expressions (C line numbers, C function names, and C local variables). Usage ----- perf probe [<options>] -P 'PROBEDEF' [-P 'PROBEDEF' ...] -k, --vmlinux <file> vmlinux/module pathname -P, --probe <p|r:[GRP/]NAME FUNC[+OFFS][@SRC]|@SRC:LINE [ARG ...]> probe point definition, where p: kprobe probe r: kretprobe probe GRP: Group name (optional) NAME: Event name FUNC: Function name OFFS: Offset from function entry (in byte) SRC: Source code path LINE: Line number ARG: Probe argument (local variable name or kprobe-tracer argument format is supported.) Changes in v4: - Add _GNU_SOURCE macro for strndup(). Changes in v3: - Remove -r option because perf always be used for online kernel. - Check malloc/calloc results. Changes in v2: - Check synthesized string length. - Rename perf kprobe to perf probe. - Use spaces for separator and update usage comment. - Check error paths in parse_probepoint(). - Check optimized-out variables. Signed-off-by: Masami Hiramatsu <mhiramat@redhat.com> Cc: Ingo Molnar <mingo@elte.hu> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: Steven Rostedt <rostedt@goodmis.org> Cc: Mike Galbraith <efault@gmx.de> Cc: Paul Mackerras <paulus@samba.org> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Christoph Hellwig <hch@infradead.org> Cc: Ananth N Mavinakayanahalli <ananth@in.ibm.com> Cc: Jim Keniston <jkenisto@us.ibm.com> Cc: Frank Ch. Eigler <fche@redhat.com> LKML-Reference: <20091008211737.29299.14784.stgit@dhcp-100-2-132.bos.redhat.com> Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
Diffstat (limited to 'tools/perf/util/probe-finder.h')
-rw-r--r--tools/perf/util/probe-finder.h68
1 files changed, 68 insertions, 0 deletions
diff --git a/tools/perf/util/probe-finder.h b/tools/perf/util/probe-finder.h
new file mode 100644
index 00000000000..af920de6486
--- /dev/null
+++ b/tools/perf/util/probe-finder.h
@@ -0,0 +1,68 @@
+#ifndef _PROBE_FINDER_H
+#define _PROBE_FINDER_H
+
+#define _stringify(n) #n
+#define stringify(n) _stringify(n)
+
+#ifdef DEBUG
+#define debug(fmt ...) \
+ fprintf(stderr, "DBG(" __FILE__ ":" stringify(__LINE__) "): " fmt)
+#else
+#define debug(fmt ...) do {} while (0)
+#endif
+
+#define ERR_IF(cnd) \
+ do { if (cnd) { \
+ fprintf(stderr, "Error (" __FILE__ ":" stringify(__LINE__) \
+ "): " stringify(cnd) "\n"); \
+ exit(1); \
+ } } while (0)
+
+#define MAX_PATH_LEN 256
+#define MAX_PROBE_BUFFER 1024
+#define MAX_PROBES 128
+
+static inline int is_c_varname(const char *name)
+{
+ /* TODO */
+ return isalpha(name[0]) || name[0] == '_';
+}
+
+struct probe_point {
+ /* Inputs */
+ char *file; /* File name */
+ int line; /* Line number */
+
+ char *function; /* Function name */
+ int offset; /* Offset bytes */
+
+ int nr_args; /* Number of arguments */
+ char **args; /* Arguments */
+
+ /* Output */
+ int found; /* Number of found probe points */
+ char *probes[MAX_PROBES]; /* Output buffers (will be allocated)*/
+};
+
+extern int find_probepoint(int fd, struct probe_point *pp);
+
+#include <libdwarf/dwarf.h>
+#include <libdwarf/libdwarf.h>
+
+struct probe_finder {
+ struct probe_point *pp; /* Target probe point */
+
+ /* For function searching */
+ Dwarf_Addr addr; /* Address */
+ Dwarf_Unsigned fno; /* File number */
+ Dwarf_Off inl_offs; /* Inline offset */
+
+ /* For variable searching */
+ Dwarf_Addr cu_base; /* Current CU base address */
+ Dwarf_Locdesc fbloc; /* Location of Current Frame Base */
+ const char *var; /* Current variable name */
+ char *buf; /* Current output buffer */
+ int len; /* Length of output buffer */
+};
+
+#endif /*_PROBE_FINDER_H */