diff options
| author | Hyeoncheol Lee | 2013-07-01 13:44:32 +0900 |
|---|---|---|
| committer | Steven Rostedt | 2014-01-02 16:17:42 -0500 |
| commit | 3925f4a5afa489e905a08edffc36a435a3434a63 (patch) | |
| tree | 00fbb091d8fdf2737cd2430f10606db52353d8e7 | |
| parent | 1301a44e77557e928700f91c7083c5770054c212 (diff) | |
tracing/probes: Add fetch{,_size} member into deref fetch method
The deref fetch methods access a memory region but it assumes that
it's a kernel memory since uprobes does not support them.
Add ->fetch and ->fetch_size member in order to provide a proper
access methods for supporting uprobes.
Acked-by: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Acked-by: Oleg Nesterov <oleg@redhat.com>
Cc: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
Cc: zhangwei(Jovi) <jovi.zhangwei@huawei.com>
Cc: Arnaldo Carvalho de Melo <acme@ghostprotocols.net>
Signed-off-by: Hyeoncheol Lee <cheol.lee@lge.com>
[namhyung@kernel.org: Split original patch into pieces as requested]
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
| -rw-r--r-- | kernel/trace/trace_probe.c | 22 |
1 files changed, 20 insertions, 2 deletions
diff --git a/kernel/trace/trace_probe.c b/kernel/trace/trace_probe.c index a31ad478b7f6..8d7231d436da 100644 --- a/kernel/trace/trace_probe.c +++ b/kernel/trace/trace_probe.c @@ -184,6 +184,8 @@ __kprobes void FETCH_FUNC_NAME(memory, string_size)(struct pt_regs *regs, struct deref_fetch_param { struct fetch_param orig; long offset; + fetch_func_t fetch; + fetch_func_t fetch_size; }; #define DEFINE_FETCH_deref(type) \ @@ -195,13 +197,26 @@ __kprobes void FETCH_FUNC_NAME(deref, type)(struct pt_regs *regs, \ call_fetch(&dprm->orig, regs, &addr); \ if (addr) { \ addr += dprm->offset; \ - fetch_memory_##type(regs, (void *)addr, dest); \ + dprm->fetch(regs, (void *)addr, dest); \ } else \ *(type *)dest = 0; \ } DEFINE_BASIC_FETCH_FUNCS(deref) DEFINE_FETCH_deref(string) -DEFINE_FETCH_deref(string_size) + +__kprobes void FETCH_FUNC_NAME(deref, string_size)(struct pt_regs *regs, + void *data, void *dest) +{ + struct deref_fetch_param *dprm = data; + unsigned long addr; + + call_fetch(&dprm->orig, regs, &addr); + if (addr && dprm->fetch_size) { + addr += dprm->offset; + dprm->fetch_size(regs, (void *)addr, dest); + } else + *(string_size *)dest = 0; +} static __kprobes void update_deref_fetch_param(struct deref_fetch_param *data) { @@ -477,6 +492,9 @@ static int parse_probe_arg(char *arg, const struct fetch_type *t, return -ENOMEM; dprm->offset = offset; + dprm->fetch = t->fetch[FETCH_MTD_memory]; + dprm->fetch_size = get_fetch_size_function(t, + dprm->fetch, ftbl); ret = parse_probe_arg(arg, t2, &dprm->orig, is_return, is_kprobe); if (ret) |