Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932462AbcJNIg1 (ORCPT ); Fri, 14 Oct 2016 04:36:27 -0400 Received: from mailapp02.imgtec.com ([217.156.133.132]:31436 "EHLO mailapp01.imgtec.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1752057AbcJNIfc (ORCPT ); Fri, 14 Oct 2016 04:35:32 -0400 From: Marcin Nowakowski To: CC: , , , Marcin Nowakowski , Ingo Molnar , Benjamin Herrenschmidt , "Paul Mackerras" , Michael Ellerman , Subject: [PATCH v4 04/12] tracing/syscalls: add compat syscall metadata Date: Fri, 14 Oct 2016 10:35:06 +0200 Message-ID: <1476434115-25428-5-git-send-email-marcin.nowakowski@imgtec.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1476434115-25428-1-git-send-email-marcin.nowakowski@imgtec.com> References: <1476434115-25428-1-git-send-email-marcin.nowakowski@imgtec.com> MIME-Version: 1.0 Content-Type: text/plain X-Originating-IP: [10.80.2.5] Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 5225 Lines: 137 Now that compat syscalls are properly distinguished from native calls, we can add metadata for compat syscalls as well. All the macros used to generate the metadata are the same as for standard syscalls, but with a compat_ prefix to distinguish them easily. Signed-off-by: Marcin Nowakowski Cc: Steven Rostedt Cc: Ingo Molnar Cc: Benjamin Herrenschmidt Cc: Paul Mackerras Cc: Michael Ellerman Cc: linuxppc-dev@lists.ozlabs.org --- include/linux/compat.h | 74 +++++++++++++++++++++++++++++++++++++++++++ kernel/trace/trace_syscalls.c | 10 ++++-- 2 files changed, 82 insertions(+), 2 deletions(-) diff --git a/include/linux/compat.h b/include/linux/compat.h index 6360939..ef2a70f 100644 --- a/include/linux/compat.h +++ b/include/linux/compat.h @@ -30,7 +30,80 @@ #define __SC_DELOUSE(t,v) ((t)(unsigned long)(v)) #endif +#ifdef CONFIG_FTRACE_SYSCALLS +#ifndef __SC_STR_ADECL +#define __SC_STR_ADECL(t, a) #a +#endif + +#ifndef __SC_STR_TDECL +#define __SC_STR_TDECL(t, a) #t +#endif + +extern struct trace_event_class event_class_syscall_enter; +extern struct trace_event_class event_class_syscall_exit; +extern struct trace_event_functions enter_syscall_print_funcs; +extern struct trace_event_functions exit_syscall_print_funcs; + +#define COMPAT_SYSCALL_TRACE_ENTER_EVENT(sname) \ + static struct syscall_metadata __syscall_meta_compat_##sname; \ + static struct trace_event_call __used \ + event_enter_compat_##sname = { \ + .class = &event_class_syscall_enter, \ + { \ + .name = "compat_sys_enter"#sname, \ + }, \ + .event.funcs = &enter_syscall_print_funcs, \ + .data = (void *)&__syscall_meta_compat_##sname,\ + .flags = TRACE_EVENT_FL_CAP_ANY, \ + }; \ + static struct trace_event_call __used \ + __attribute__((section("_ftrace_events"))) \ + *__event_enter_compat_##sname = &event_enter_compat_##sname; + +#define COMPAT_SYSCALL_TRACE_EXIT_EVENT(sname) \ + static struct syscall_metadata __syscall_meta_compat_##sname; \ + static struct trace_event_call __used \ + event_exit_compat_##sname = { \ + .class = &event_class_syscall_exit, \ + { \ + .name = "compat_sys_exit"#sname, \ + }, \ + .event.funcs = &exit_syscall_print_funcs, \ + .data = (void *)&__syscall_meta_compat_##sname,\ + .flags = TRACE_EVENT_FL_CAP_ANY, \ + }; \ + static struct trace_event_call __used \ + __attribute__((section("_ftrace_events"))) \ + *__event_exit_compat_##sname = &event_exit_compat_##sname; + +#define COMPAT_SYSCALL_METADATA(sname, nb, ...) \ + static const char *types_compat_##sname[] = { \ + __MAP(nb,__SC_STR_TDECL,__VA_ARGS__) \ + }; \ + static const char *args_compat_##sname[] = { \ + __MAP(nb,__SC_STR_ADECL,__VA_ARGS__) \ + }; \ + COMPAT_SYSCALL_TRACE_ENTER_EVENT(sname); \ + COMPAT_SYSCALL_TRACE_EXIT_EVENT(sname); \ + static struct syscall_metadata __used \ + __syscall_meta_compat_##sname = { \ + .name = "compat_sys"#sname, \ + .nb_args = nb, \ + .types = nb ? types_compat_##sname : NULL, \ + .args = nb ? args_compat_##sname : NULL, \ + .enter_event = &event_enter_compat_##sname, \ + .exit_event = &event_exit_compat_##sname, \ + .enter_fields = LIST_HEAD_INIT(__syscall_meta_compat_##sname.enter_fields), \ + }; \ + static struct syscall_metadata __used \ + __attribute__((section("__syscalls_metadata"))) \ + *__p_syscall_meta_compat_##sname = &__syscall_meta_compat_##sname; +#else +#define COMPAT_SYSCALL_METADATA(sname, nb, ...) +#endif + #define COMPAT_SYSCALL_DEFINE0(name) \ + COMPAT_SYSCALL_METADATA(_##name, 0); \ asmlinkage long compat_sys_##name(void) #define COMPAT_SYSCALL_DEFINE1(name, ...) \ @@ -47,6 +120,7 @@ COMPAT_SYSCALL_DEFINEx(6, _##name, __VA_ARGS__) #define COMPAT_SYSCALL_DEFINEx(x, name, ...) \ + COMPAT_SYSCALL_METADATA(name, x, __VA_ARGS__) \ asmlinkage long compat_sys##name(__MAP(x,__SC_DECL,__VA_ARGS__))\ __attribute__((alias(__stringify(compat_SyS##name)))); \ static inline long C_SYSC##name(__MAP(x,__SC_DECL,__VA_ARGS__));\ diff --git a/kernel/trace/trace_syscalls.c b/kernel/trace/trace_syscalls.c index 707a57c..10c058f 100644 --- a/kernel/trace/trace_syscalls.c +++ b/kernel/trace/trace_syscalls.c @@ -38,12 +38,18 @@ static struct syscall_metadata **syscalls_metadata; static inline bool syscall_match_sym_name(const char *sym, const char *name) { /* - * Only compare after the "sys" prefix. Archs that use + * Only compare after the "sys" or "compat_sys" prefix. Archs that use * syscall wrappers may have syscalls symbols aliases prefixed * with ".SyS" or ".sys" instead of "sys", leading to an unwanted * mismatch. */ - return !strcmp(sym + 3 + ARCH_SYM_NAME_SKIP_CHARS, name + 3); + int prefix_len = 3; + + if (!strncasecmp(sym, "compat_", 7)) + prefix_len = 10; + + return !strcmp(sym + prefix_len + ARCH_SYM_NAME_SKIP_CHARS, + name + prefix_len); } #ifdef ARCH_COMPAT_SYSCALL_NUMBERS_OVERLAP -- 2.7.4