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Subject[PATCH 2/5] tracing/syscalls: Add fields format for exit events
Add "format" file for syscall exit events:

# cat events/syscalls/sys_exit_open/format
name: sys_exit_open
ID: 344
format:
field:unsigned short common_type; offset:0; size:2;
field:unsigned char common_flags; offset:2; size:1;
field:unsigned char common_preempt_count; offset:3; size:1;
field:int common_pid; offset:4; size:4;
field:int common_tgid; offset:8; size:4;

field:int nr; offset:12; size:4;
field:unsigned long ret; offset:16; size:4;

Signed-off-by: Li Zefan <lizf@cn.fujitsu.com>
---
include/linux/syscalls.h | 3 ++-
include/trace/syscall.h | 6 ++++--
kernel/trace/trace_syscalls.c | 18 +++++++++++++++++-
3 files changed, 23 insertions(+), 4 deletions(-)

diff --git a/include/linux/syscalls.h b/include/linux/syscalls.h
index 87d06c1..8d57f77 100644
--- a/include/linux/syscalls.h
+++ b/include/linux/syscalls.h
@@ -189,7 +189,7 @@ static void prof_sysexit_disable_##sname(struct ftrace_event_call *event_call) \
.system = "syscalls", \
.event = &event_syscall_enter, \
.raw_init = init_enter_##sname, \
- .show_format = ftrace_format_syscall, \
+ .show_format = syscall_enter_format, \
.regfunc = reg_event_syscall_enter, \
.unregfunc = unreg_event_syscall_enter, \
.data = "sys"#sname, \
@@ -225,6 +225,7 @@ static void prof_sysexit_disable_##sname(struct ftrace_event_call *event_call) \
.system = "syscalls", \
.event = &event_syscall_exit, \
.raw_init = init_exit_##sname, \
+ .show_format = syscall_exit_format, \
.regfunc = reg_event_syscall_exit, \
.unregfunc = unreg_event_syscall_exit, \
.data = "sys"#sname, \
diff --git a/include/trace/syscall.h b/include/trace/syscall.h
index 0cb0362..5ce85d7 100644
--- a/include/trace/syscall.h
+++ b/include/trace/syscall.h
@@ -55,8 +55,10 @@ extern int reg_event_syscall_enter(void *ptr);
extern void unreg_event_syscall_enter(void *ptr);
extern int reg_event_syscall_exit(void *ptr);
extern void unreg_event_syscall_exit(void *ptr);
-extern int
-ftrace_format_syscall(struct ftrace_event_call *call, struct trace_seq *s);
+extern int syscall_enter_format(struct ftrace_event_call *call,
+ struct trace_seq *s);
+extern int syscall_exit_format(struct ftrace_event_call *call,
+ struct trace_seq *s);
enum print_line_t print_syscall_enter(struct trace_iterator *iter, int flags);
enum print_line_t print_syscall_exit(struct trace_iterator *iter, int flags);
#endif
diff --git a/kernel/trace/trace_syscalls.c b/kernel/trace/trace_syscalls.c
index d10daf0..7336b6c 100644
--- a/kernel/trace/trace_syscalls.c
+++ b/kernel/trace/trace_syscalls.c
@@ -97,7 +97,7 @@ extern char *__bad_type_size(void);
__bad_type_size() : \
#type, #name, offsetof(typeof(trace), name), sizeof(trace.name)

-int ftrace_format_syscall(struct ftrace_event_call *call, struct trace_seq *s)
+int syscall_enter_format(struct ftrace_event_call *call, struct trace_seq *s)
{
int i;
int nr;
@@ -149,6 +149,22 @@ int ftrace_format_syscall(struct ftrace_event_call *call, struct trace_seq *s)
return ret;
}

+int syscall_exit_format(struct ftrace_event_call *call, struct trace_seq *s)
+{
+ int ret;
+ struct syscall_trace_exit trace;
+
+ ret = trace_seq_printf(s,
+ "\tfield:%s %s;\toffset:%zu;\tsize:%zu;\n"
+ "\tfield:%s %s;\toffset:%zu;\tsize:%zu;\n",
+ SYSCALL_FIELD(int, nr),
+ SYSCALL_FIELD(unsigned long, ret));
+ if (!ret)
+ return 0;
+
+ return trace_seq_printf(s, "\nprint fmt: \"0x%%lx\", REC->ret\n");
+}
+
void ftrace_syscall_enter(struct pt_regs *regs, long id)
{
struct syscall_trace_enter *entry;
--
1.6.3


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