Syscall may alter pt_regs structure passed to it, resulting in a
mismatch between syscall entry end syscall exit entries in the ftrace.
Temporary restore syscall field of the pt_regs for the duration of
do_syscall_trace_leave.
Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
l32i a7, a2, PT_SYSCALL
1:
+ s32i a7, a1, 4
+
/* syscall = sys_call_table[syscall_nr] */
movi a4, sys_call_table
retw
1:
+ l32i a4, a1, 4
+ l32i a3, a2, PT_SYSCALL
+ s32i a4, a2, PT_SYSCALL
mov a6, a2
call4 do_syscall_trace_leave
+ s32i a3, a2, PT_SYSCALL
retw
ENDPROC(system_call)