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Subject[PATCH] ARM: Wire up HAVE_SYSCALL_TRACEPOINTS
    This patch is necessary to make ftrace syscall trace working for ARM.
The following events are added to /sys/kernel/debug/tracing/available_events
- raw_syscalls:sys_enter
- raw_syscalls:sys_exit
- syscalls:sys_enter_*
- syscalls:sys_exit_*

Sample output;
# tracer: nop
#
# TASK-PID CPU# TIMESTAMP FUNCTION
# | | | | |
trace-cmd-640 [000] 1174.164948: sys_write -> 0x1
trace-cmd-640 [000] 1174.164948: sys_exit: NR 4 = 1
trace-cmd-640 [000] 1174.165009: sys_write(fd: 1, buf: 400c2000, count: d0)
trace-cmd-640 [000] 1174.165009: sys_enter: NR 4 (1, 400c2000, d0, 0, d0, f54f8)
trace-cmd-640 [000] 1174.165070: sys_write -> 0xffffffe0
trace-cmd-640 [000] 1174.165070: sys_exit: NR 4 = -32
sh-637 [000] 1174.165649: sys_wait4 -> 0x280
sh-637 [000] 1174.165649: sys_exit: NR 114 = 640
sh-637 [000] 1174.165680: sys_ioctl(fd: 3ff, cmd: 5410, arg: be82fad4)
sh-637 [000] 1174.165710: sys_enter: NR 54 (3ff, 5410, be82fad4, be82facc, 1d578, 1b6fc)
sh-637 [000] 1174.165710: sys_ioctl -> 0x0
sh-637 [000] 1174.165741: sys_exit: NR 54 = 0
sh-637 [000] 1174.165771: sys_wait4(upid: ffffffff, stat_addr: be82fae4, options: 1, ru: 0)
sh-637 [000] 1174.165771: sys_enter: NR 114 (ffffffff, be82fae4, 1, 0, 1, be82fae4)
sh-637 [000] 1174.165771: sys_wait4 -> 0xfffffff6
sh-637 [000] 1174.165802: sys_exit: NR 114 = -10
sh-637 [000] 1174.165802: sys_wait4(upid: ffffffff, stat_addr: be82fae4, options: 1, ru: 0)

Signed-off-by: Takuo Koguchi <takuo.koguchi.sw@hitachi.com>
Cc: Russell King <linux@arm.linux.org.uk>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Jason Baron <jbaron@redhat.com>
---
arch/arm/Kconfig | 1 +
arch/arm/include/asm/syscall.h | 45 ++++++++++++++++++++++++++++++++++++
arch/arm/include/asm/thread_info.h | 3 ++
arch/arm/include/asm/unistd.h | 3 ++
arch/arm/kernel/entry-common.S | 4 +-
arch/arm/kernel/ptrace.c | 10 ++++++++
6 files changed, 64 insertions(+), 2 deletions(-)
create mode 100644 arch/arm/include/asm/syscall.h

diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index 44789ef..84181b3 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -13,6 +13,7 @@ config ARM
select HAVE_KPROBES if !XIP_KERNEL
select HAVE_KRETPROBES if (HAVE_KPROBES)
select HAVE_FUNCTION_TRACER if (!XIP_KERNEL)
+ select HAVE_SYSCALL_TRACEPOINTS
select HAVE_FTRACE_MCOUNT_RECORD if (!XIP_KERNEL)
select HAVE_DYNAMIC_FTRACE if (!XIP_KERNEL)
select HAVE_FUNCTION_GRAPH_TRACER if (!THUMB2_KERNEL)
diff --git a/arch/arm/include/asm/syscall.h b/arch/arm/include/asm/syscall.h
new file mode 100644
index 0000000..cabeb67
--- /dev/null
+++ b/arch/arm/include/asm/syscall.h
@@ -0,0 +1,45 @@
+#ifndef _ASM_ARM_SYSCALL_H
+#define _ASM_ARM_SYSCALL_H
+
+extern const unsigned long sys_call_table[];
+
+#include <linux/sched.h>
+
+static inline long syscall_get_nr(struct task_struct *task,
+ struct pt_regs *regs)
+{
+ return regs->ARM_r7;
+}
+
+static inline long syscall_get_return_value(struct task_struct *task,
+ struct pt_regs *regs)
+{
+ return regs->ARM_r0;
+}
+
+static inline void syscall_get_arguments(struct task_struct *task,
+ struct pt_regs *regs,
+ unsigned int i, unsigned int n,
+ unsigned long *args)
+{
+ BUG_ON(i);
+ switch (n) {
+ case 6:
+ args[5] = regs->ARM_r5; /* fall through */
+ case 5:
+ args[4] = regs->ARM_r4;
+ case 4:
+ args[3] = regs->ARM_r3;
+ case 3:
+ args[2] = regs->ARM_r2;
+ case 2:
+ args[1] = regs->ARM_r1;
+ case 1:
+ args[0] = regs->ARM_r0;
+ case 0:
+ break;
+ default:
+ BUG();
+ }
+}
+#endif /* _ASM_ARM_SYSCALL_H */
diff --git a/arch/arm/include/asm/thread_info.h b/arch/arm/include/asm/thread_info.h
index 7b5cc8d..2509028 100644
--- a/arch/arm/include/asm/thread_info.h
+++ b/arch/arm/include/asm/thread_info.h
@@ -139,6 +139,7 @@ extern void vfp_flush_hwstate(struct thread_info *);
#define TIF_NEED_RESCHED 1
#define TIF_NOTIFY_RESUME 2 /* callback before returning to user */
#define TIF_SYSCALL_TRACE 8
+#define TIF_SYSCALL_TRACEPOINT 15
#define TIF_POLLING_NRFLAG 16
#define TIF_USING_IWMMXT 17
#define TIF_MEMDIE 18 /* is terminating due to OOM killer */
@@ -150,11 +151,13 @@ extern void vfp_flush_hwstate(struct thread_info *);
#define _TIF_NEED_RESCHED (1 << TIF_NEED_RESCHED)
#define _TIF_NOTIFY_RESUME (1 << TIF_NOTIFY_RESUME)
#define _TIF_SYSCALL_TRACE (1 << TIF_SYSCALL_TRACE)
+#define _TIF_SYSCALL_TRACEPOINT (1 << TIF_SYSCALL_TRACEPOINT)
#define _TIF_POLLING_NRFLAG (1 << TIF_POLLING_NRFLAG)
#define _TIF_USING_IWMMXT (1 << TIF_USING_IWMMXT)
#define _TIF_FREEZE (1 << TIF_FREEZE)
#define _TIF_RESTORE_SIGMASK (1 << TIF_RESTORE_SIGMASK)
#define _TIF_SECCOMP (1 << TIF_SECCOMP)
+#define _TIF_SYSCALL_T_OR_A (_TIF_SYSCALL_TRACE | _TIF_SYSCALL_TRACEPOINT)

/*
* Change these and you break ASM code in entry-common.S
diff --git a/arch/arm/include/asm/unistd.h b/arch/arm/include/asm/unistd.h
index 4a11237..f4eac2d 100644
--- a/arch/arm/include/asm/unistd.h
+++ b/arch/arm/include/asm/unistd.h
@@ -405,6 +405,9 @@
#define __NR_process_vm_readv (__NR_SYSCALL_BASE+376)
#define __NR_process_vm_writev (__NR_SYSCALL_BASE+377)

+#ifndef __ASSEMBLY__
+#define NR_syscalls 378
+#endif
/*
* The following SWIs are ARM private.
*/
diff --git a/arch/arm/kernel/entry-common.S b/arch/arm/kernel/entry-common.S
index b2a27b6..a1577c2 100644
--- a/arch/arm/kernel/entry-common.S
+++ b/arch/arm/kernel/entry-common.S
@@ -87,7 +87,7 @@ ENTRY(ret_from_fork)
get_thread_info tsk
ldr r1, [tsk, #TI_FLAGS] @ check for syscall tracing
mov why, #1
- tst r1, #_TIF_SYSCALL_TRACE @ are we tracing syscalls?
+ tst r1, #_TIF_SYSCALL_T_OR_A @ are we tracing syscalls?
beq ret_slow_syscall
mov r1, sp
mov r0, #1 @ trace exit [IP = 1]
@@ -443,7 +443,7 @@ ENTRY(vector_swi)
1:
#endif

- tst r10, #_TIF_SYSCALL_TRACE @ are we tracing syscalls?
+ tst r10, #_TIF_SYSCALL_T_OR_A @ are we tracing syscalls?
bne __sys_trace

cmp scno, #NR_syscalls @ check upper syscall limit
diff --git a/arch/arm/kernel/ptrace.c b/arch/arm/kernel/ptrace.c
index 483727a..a690c9f 100644
--- a/arch/arm/kernel/ptrace.c
+++ b/arch/arm/kernel/ptrace.c
@@ -28,6 +28,9 @@
#include <asm/system.h>
#include <asm/traps.h>

+#define CREATE_TRACE_POINTS
+#include <trace/events/syscalls.h>
+
#define REG_PC 15
#define REG_PSR 16
/*
@@ -906,6 +909,13 @@ asmlinkage int syscall_trace(int why, struct pt_regs *regs, int scno)
{
unsigned long ip;

+ if (unlikely(test_thread_flag(TIF_SYSCALL_TRACEPOINT))) {
+ if (why)
+ trace_sys_exit(regs, regs->ARM_r0);
+ else
+ trace_sys_enter(regs, scno);
+ }
+
if (!test_thread_flag(TIF_SYSCALL_TRACE))
return scno;
if (!(current->ptrace & PT_PTRACED))
--
1.7.5.4


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