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author | Masami Hiramatsu <mhiramat@redhat.com> | 2009-10-08 17:17:38 -0400 |
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committer | Frederic Weisbecker <fweisbec@gmail.com> | 2009-10-12 23:31:52 +0200 |
commit | 4ea42b181434bfc6a0a18d32214130a242d489bf (patch) | |
tree | 2c467d795d90440e0293951087c41caca8397584 /tools/perf/util/probe-finder.h | |
parent | e93f4d8539d5e9dd59f4af9d8ef4e9b62cfa1f81 (diff) | |
download | linux-4ea42b181434bfc6a0a18d32214130a242d489bf.tar.gz linux-4ea42b181434bfc6a0a18d32214130a242d489bf.tar.bz2 linux-4ea42b181434bfc6a0a18d32214130a242d489bf.zip |
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.h | 68 |
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 000000000000..af920de64866 --- /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 */ |