arm64: split syscall_trace() into separate functions for enter/exit

As done in arm, this change makes it easy to confirm we invoke syscall
related hooks, including syscall tracepoint, audit and seccomp which would
be implemented later, in correct order. That is, undoing operations in the
opposite order on exit that they were done on entry.

Acked-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: AKASHI Takahiro <takahiro.akashi@linaro.org>
Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>

1 files changed, 4 insertions, 6 deletions

diff --git a/arch/arm64/kernel/entry.S b/arch/arm64/kernel/entry.S
index be95f3544ce4..a670d0a98c89 100644
--- a/arch/arm64/kernel/entry.S
+++ b/arch/arm64/kernel/entry.S
@@ -628,9 +628,8 @@ ENDPROC(el0_svc)
          * switches, and waiting for our parent to respond.
          */
 __sys_trace:
-        mov     x1, sp
-        mov     w0, #0                          // trace entry
-        bl      syscall_trace
+        mov     x0, sp
+        bl      syscall_trace_enter
         adr     lr, __sys_trace_return          // return address
         uxtw    scno, w0                        // syscall number (possibly new)
         mov     x1, sp                          // pointer to regs
@@ -645,9 +644,8 @@ __sys_trace:
 
 __sys_trace_return:
         str     x0, [sp]                        // save returned x0
-        mov     x1, sp
-        mov     w0, #1                          // trace exit
-        bl      syscall_trace
+        mov     x0, sp
+        bl      syscall_trace_exit
         b       ret_to_user
 
 /*