xtensa: use actual syscall number in do_syscall_trace_leave



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>

parent 79a3aaa7

arch/xtensa/kernel/entry.S

+6 −0

Original line number	Diff line number	Diff line
		@@ -1860,6 +1860,8 @@ ENTRY(system_call)
		l32i a7, a2, PT_SYSCALL

		1:
		s32i a7, a1, 4

		/* syscall = sys_call_table[syscall_nr] */

		movi a4, sys_call_table
		@@ -1893,8 +1895,12 @@ ENTRY(system_call)
		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)