Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932724Ab3GCMfx (ORCPT ); Wed, 3 Jul 2013 08:35:53 -0400 Received: from lgeamrelo02.lge.com ([156.147.1.126]:50635 "EHLO LGEAMRELO02.lge.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756100Ab3GCMfu (ORCPT ); Wed, 3 Jul 2013 08:35:50 -0400 X-AuditID: 9c93017e-b7c04ae00000295f-eb-51d41aa4c2a5 From: Namhyung Kim To: Steven Rostedt Cc: Hyeoncheol Lee , LKML , Masami Hiramatsu , Srikar Dronamraju , Oleg Nesterov , Arnaldo Carvalho de Melo Subject: [PATCH 02/12] tracing/kprobes: Add fetch{,_size} member into symbol and deref fetch method Date: Wed, 3 Jul 2013 21:35:36 +0900 Message-Id: <1372854946-17074-3-git-send-email-namhyung@kernel.org> X-Mailer: git-send-email 1.7.11.7 In-Reply-To: <1372854946-17074-1-git-send-email-namhyung@kernel.org> References: <1372854946-17074-1-git-send-email-namhyung@kernel.org> X-Brightmail-Tracker: AAAAAA== Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 4181 Lines: 134 From: Hyeoncheol Lee Those symbol and deref fetch methods access a memory region but they assume it's a kernel memory since uprobes does not support them. Add ->fetch and ->fetch_size member in order to provide a proper access method for supporting uprobes. Cc: Masami Hiramatsu Cc: Srikar Dronamraju Cc: Oleg Nesterov Cc: Arnaldo Carvalho de Melo Signed-off-by: Hyeoncheol Lee [namhyung@kernel.org: Split original patch into pieces as requested] Signed-off-by: Namhyung Kim --- kernel/trace/trace_probe.c | 48 ++++++++++++++++++++++++++++++++++++++++------ 1 file changed, 42 insertions(+), 6 deletions(-) diff --git a/kernel/trace/trace_probe.c b/kernel/trace/trace_probe.c index c58c25d81591..c123a890c5b1 100644 --- a/kernel/trace/trace_probe.c +++ b/kernel/trace/trace_probe.c @@ -93,6 +93,8 @@ struct symbol_cache { char *symbol; long offset; unsigned long addr; + fetch_func_t fetch; + fetch_func_t fetch_size; }; static unsigned long update_symbol_cache(struct symbol_cache *sc) @@ -139,18 +141,29 @@ __kprobes void FETCH_FUNC_NAME(symbol, type)(struct pt_regs *regs, \ { \ struct symbol_cache *sc = data; \ if (sc->addr) \ - fetch_memory_##type(regs, (void *)sc->addr, dest); \ + sc->fetch(regs, (void *)sc->addr, dest); \ else \ *(type *)dest = 0; \ } DEFINE_BASIC_FETCH_FUNCS(symbol) DEFINE_FETCH_symbol(string) -DEFINE_FETCH_symbol(string_size) + +__kprobes void FETCH_FUNC_NAME(symbol, string_size)(struct pt_regs *regs, + void *data, void *dest) +{ + struct symbol_cache *sc = data; + if (sc->addr && sc->fetch_size) + sc->fetch_size(regs, (void *)sc->addr, dest); + else + *(string_size *)dest = 0; +} /* Dereference memory access function */ struct deref_fetch_param { struct fetch_param orig; long offset; + fetch_func_t fetch; + fetch_func_t fetch_size; }; #define DEFINE_FETCH_deref(type) \ @@ -162,13 +175,26 @@ __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) { @@ -410,13 +436,20 @@ static int parse_probe_arg(char *arg, const struct fetch_type *t, f->fn = t->fetch[FETCH_MTD_memory]; f->data = (void *)param; } else { + struct symbol_cache *sc; + ret = traceprobe_split_symbol_offset(arg + 1, &offset); if (ret) break; - f->data = alloc_symbol_cache(arg + 1, offset); - if (f->data) + sc = alloc_symbol_cache(arg + 1, offset); + if (sc) { f->fn = t->fetch[FETCH_MTD_symbol]; + sc->fetch = t->fetch[FETCH_MTD_memory]; + sc->fetch_size = get_fetch_size_function(t, + sc->fetch, ttbl); + f->data = sc; + } } break; @@ -448,6 +481,9 @@ 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, ttbl); ret = parse_probe_arg(arg, t2, &dprm->orig, is_return, is_kprobe); if (ret) -- 1.7.11.7 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/