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Date: Mon, 1 Mar 2010 16:05:22 -0500
From: Jason Baron <jbaron@...hat.com>
To: Heiko Carstens <heiko.carstens@...ibm.com>
Cc: fweisbec@...il.com, mingo@...e.hu, rostedt@...dmis.org,
linux-kernel@...r.kernel.org, laijs@...fujitsu.com,
lizf@...fujitsu.com, hpa@...or.com, tglx@...utronix.de,
mhiramat@...hat.com, benh@...nel.crashing.org, davem@...emloft.net,
lethal@...ux-sh.org, schwidefsky@...ibm.com,
brueckner@...ux.vnet.ibm.com, tony.luck@...el.com
Subject: Re: [PATCH 08/12] syscalls: add new COMPAT_SYSCALL_DEFINE#N() macro
On Sun, Feb 28, 2010 at 11:09:02AM +0100, Heiko Carstens wrote:
> On Fri, Feb 26, 2010 at 04:37:30PM -0500, Jason Baron wrote:
> > Add COMPAT_SYSCALL_DEFINE#N() macro define common compat syscalls that
> > are not arch specific. Prepends "compat_sys_" to the syscall name to identify
> > it.
> >
> > Signed-off-by: Jason Baron <jbaron@...hat.com>
> > ---
> > include/linux/syscalls.h | 7 +++++++
> > 1 files changed, 7 insertions(+), 0 deletions(-)
> >
> > diff --git a/include/linux/syscalls.h b/include/linux/syscalls.h
> > index cd7b959..241a19c 100644
> > --- a/include/linux/syscalls.h
> > +++ b/include/linux/syscalls.h
> > @@ -228,6 +228,13 @@ struct perf_event_attr;
> > #define ARCH_COMPAT_SYSCALL_DEFINE5(name, ...) SYSCALL_DEFINEx(5, arch_compat_sys_##name, __VA_ARGS__)
> > #define ARCH_COMPAT_SYSCALL_DEFINE6(name, ...) SYSCALL_DEFINEx(6, arch_compat_sys_##name, __VA_ARGS__)
> >
> > +#define COMPAT_SYSCALL_DEFINE1(name, ...) SYSCALL_DEFINEx(1, compat_sys_##name, __VA_ARGS__)
> > +#define COMPAT_SYSCALL_DEFINE2(name, ...) SYSCALL_DEFINEx(2, compat_sys_##name, __VA_ARGS__)
> > +#define COMPAT_SYSCALL_DEFINE3(name, ...) SYSCALL_DEFINEx(3, compat_sys_##name, __VA_ARGS__)
> > +#define COMPAT_SYSCALL_DEFINE4(name, ...) SYSCALL_DEFINEx(4, compat_sys_##name, __VA_ARGS__)
> > +#define COMPAT_SYSCALL_DEFINE5(name, ...) SYSCALL_DEFINEx(5, compat_sys_##name, __VA_ARGS__)
> > +#define COMPAT_SYSCALL_DEFINE6(name, ...) SYSCALL_DEFINEx(6, compat_sys_##name, __VA_ARGS__)
> > +
>
> For architectures which select CONFIG_HAVE_SYSCALL_WRAPPERS this adds
> unnecessary sign extension code to each compat syscall.
> On the other hand we could get rid partly of the arch specific sign extension
> code but that would need some other changes before as well.
> For example this one:
>
> asmlinkage long compat_sys_gettimeofday(struct compat_timeval __user *tv,
> struct timezone __user *tz)
>
> should be converted to a function which takes two compat_uptr_t's and let
> the syscall code itself do the proper pointer conversion (compat_ptr()).
>
> Besides that the syscall alias names for these compat calls do look a
> bit strange:
>
> 000000000008b57c T SyScompat_sys_adjtimex
> 000000000008b57c T compat_sys_adjtimex
>
> That needs to be fixed as well.
> Or simply add a 1:1 wrapper independent of CONFIG_HAVE_SYSCALL_WRAPPERS.
ok, the later suggestion seems simpler. Below I've re-spun patch #6 and
#8. how do they look?
thanks,
-Jason
patch 6/12:
diff --git a/include/linux/syscalls.h b/include/linux/syscalls.h
index e601985..39cc67b 100644
--- a/include/linux/syscalls.h
+++ b/include/linux/syscalls.h
@@ -141,7 +141,7 @@ struct perf_event_attr;
__attribute__((__aligned__(4))) \
__attribute__((section("_ftrace_events"))) \
event_enter_##sname = { \
- .name = "sys_enter"#sname, \
+ .name = "enter_"#sname, \
.system = "syscalls", \
.event = &enter_syscall_print_##sname, \
.raw_init = init_syscall_trace, \
@@ -163,7 +163,7 @@ struct perf_event_attr;
__attribute__((__aligned__(4))) \
__attribute__((section("_ftrace_events"))) \
event_exit_##sname = { \
- .name = "sys_exit"#sname, \
+ .name = "exit_"#sname, \
.system = "syscalls", \
.event = &exit_syscall_print_##sname, \
.raw_init = init_syscall_trace, \
@@ -181,7 +181,7 @@ struct perf_event_attr;
__attribute__((__aligned__(4))) \
__attribute__((section("__syscalls_metadata"))) \
__syscall_meta_##sname = { \
- .name = "sys"#sname, \
+ .name = #sname, \
.nb_args = nb, \
.types = types_##sname, \
.args = args_##sname, \
@@ -194,20 +194,20 @@ struct perf_event_attr;
};
#define SYSCALL_DEFINE0(sname) \
- SYSCALL_TRACE_ENTER_EVENT(_##sname); \
- SYSCALL_TRACE_EXIT_EVENT(_##sname); \
+ SYSCALL_TRACE_ENTER_EVENT(sys_##sname); \
+ SYSCALL_TRACE_EXIT_EVENT(sys_##sname); \
static const struct syscall_metadata __used \
__attribute__((__aligned__(4))) \
__attribute__((section("__syscalls_metadata"))) \
- __syscall_meta__##sname = { \
+ __syscall_meta_sys_##sname = { \
.name = "sys_"#sname, \
.nb_args = 0, \
.ftrace_enter = 0, \
.ftrace_exit = 0, \
.perf_enter = 0, \
.perf_exit = 0, \
- .enter_event = &event_enter__##sname, \
- .exit_event = &event_exit__##sname, \
+ .enter_event = &event_enter_sys_##sname, \
+ .exit_event = &event_exit_sys_##sname, \
}; \
asmlinkage long sys_##sname(void)
#else
@@ -221,6 +221,32 @@ struct perf_event_attr;
#define SYSCALL_DEFINE5(name, ...) SYSCALL_DEFINEx(5, _##name, __VA_ARGS__)
#define SYSCALL_DEFINE6(name, ...) SYSCALL_DEFINEx(6, _##name, __VA_ARGS__)
+#ifdef CONFIG_COMPAT
+
+#define ARCH_COMPAT_SYSCALL_DEFINE1(name, ...) COMPAT_SYSCALL_DEFINEx(1, arch_compat_sys_##name, __VA_ARGS__)
+#define ARCH_COMPAT_SYSCALL_DEFINE2(name, ...) COMPAT_SYSCALL_DEFINEx(2, arch_compat_sys_##name, __VA_ARGS__)
+#define ARCH_COMPAT_SYSCALL_DEFINE3(name, ...) COMPAT_SYSCALL_DEFINEx(3, arch_compat_sys_##name, __VA_ARGS__)
+#define ARCH_COMPAT_SYSCALL_DEFINE4(name, ...) COMPAT_SYSCALL_DEFINEx(4, arch_compat_sys_##name, __VA_ARGS__)
+#define ARCH_COMPAT_SYSCALL_DEFINE5(name, ...) COMPAT_SYSCALL_DEFINEx(5, arch_compat_sys_##name, __VA_ARGS__)
+#define ARCH_COMPAT_SYSCALL_DEFINE6(name, ...) COMPAT_SYSCALL_DEFINEx(6, arch_compat_sys_##name, __VA_ARGS__)
+
+#ifdef CONFIG_FTRACE_SYSCALLS
+#define COMPAT_SYSCALL_DEFINEx(x, sname, ...) \
+ static const char *types_##sname[] = { \
+ __SC_STR_TDECL##x(__VA_ARGS__) \
+ }; \
+ static const char *args_##sname[] = { \
+ __SC_STR_ADECL##x(__VA_ARGS__) \
+ }; \
+ SYSCALL_METADATA(sname, x); \
+ asmlinkage long sname(__SC_DECL##x(__VA_ARGS__))
+#else
+#define COMPAT_SYSCALL_DEFINEx(x, sname, ...) \
+ asmlinkage long sname(__SC_DECL##x(__VA_ARGS__))
+#endif
+
+#endif
+
#ifdef CONFIG_PPC64
#define SYSCALL_ALIAS(alias, name) \
asm ("\t.globl " #alias "\n\t.set " #alias ", " #name "\n" \
@@ -237,13 +263,13 @@ struct perf_event_attr;
#ifdef CONFIG_FTRACE_SYSCALLS
#define SYSCALL_DEFINEx(x, sname, ...) \
- static const char *types_##sname[] = { \
+ static const char *types_sys##sname[] = { \
__SC_STR_TDECL##x(__VA_ARGS__) \
}; \
- static const char *args_##sname[] = { \
+ static const char *args_sys##sname[] = { \
__SC_STR_ADECL##x(__VA_ARGS__) \
}; \
- SYSCALL_METADATA(sname, x); \
+ SYSCALL_METADATA(sys##sname, x); \
__SYSCALL_DEFINEx(x, sname, __VA_ARGS__)
#else
#define SYSCALL_DEFINEx(x, sname, ...) \
patch 8/12:
diff --git a/include/linux/syscalls.h b/include/linux/syscalls.h
index 39cc67b..7b4c746 100644
--- a/include/linux/syscalls.h
+++ b/include/linux/syscalls.h
@@ -230,6 +230,13 @@ struct perf_event_attr;
#define ARCH_COMPAT_SYSCALL_DEFINE5(name, ...) COMPAT_SYSCALL_DEFINEx(5, arch_compat_sys_##name, __VA_ARGS__)
#define ARCH_COMPAT_SYSCALL_DEFINE6(name, ...) COMPAT_SYSCALL_DEFINEx(6, arch_compat_sys_##name, __VA_ARGS__)
+#define COMPAT_SYSCALL_DEFINE1(name, ...) COMPAT_SYSCALL_DEFINEx(1, compat_sys_##name, __VA_ARGS__)
+#define COMPAT_SYSCALL_DEFINE2(name, ...) COMPAT_SYSCALL_DEFINEx(2, compat_sys_##name, __VA_ARGS__)
+#define COMPAT_SYSCALL_DEFINE3(name, ...) COMPAT_SYSCALL_DEFINEx(3, compat_sys_##name, __VA_ARGS__)
+#define COMPAT_SYSCALL_DEFINE4(name, ...) COMPAT_SYSCALL_DEFINEx(4, compat_sys_##name, __VA_ARGS__)
+#define COMPAT_SYSCALL_DEFINE5(name, ...) COMPAT_SYSCALL_DEFINEx(5, compat_sys_##name, __VA_ARGS__)
+#define COMPAT_SYSCALL_DEFINE6(name, ...) COMPAT_SYSCALL_DEFINEx(6, compat_sys_##name, __VA_ARGS__)
+
#ifdef CONFIG_FTRACE_SYSCALLS
#define COMPAT_SYSCALL_DEFINEx(x, sname, ...) \
static const char *types_##sname[] = { \
--
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