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xtensa: call do_syscall_trace_{enter,leave} selectively

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Check whether calls to do_syscall_trace_{enter,leave} are necessary in
the system_call function. Define _TIF_WORK_MASK to a bitmask of flags
that reuire the calls. Fix comment.

Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
This commit is contained in:
Max Filippov
2018-11-15 19:33:47 -08:00
parent 6a986984b6
commit 3aee3e25de
3 changed files with 22 additions and 14 deletions
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26
arch/xtensa/kernel/entry.S
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@@ -1846,20 +1846,28 @@ ENTRY(system_call)
/* regs->syscall = regs->areg[2] */
l32i a3, a2, PT_AREG2
mov a6, a2
s32i a3, a2, PT_SYSCALL
call4 do_syscall_trace_enter
mov a3, a6
l32i a7, a2, PT_AREG2
s32i a7, a2, PT_SYSCALL
GET_THREAD_INFO(a4, a1)
l32i a3, a4, TI_FLAGS
movi a4, _TIF_WORK_MASK
and a3, a3, a4
beqz a3, 1f
mov a6, a2
call4 do_syscall_trace_enter
l32i a7, a2, PT_SYSCALL
1:
/* syscall = sys_call_table[syscall_nr] */
movi a4, sys_call_table
movi a5, __NR_syscalls
movi a6, -ENOSYS
bgeu a3, a5, 1f
bgeu a7, a5, 1f
addx4 a4, a3, a4
addx4 a4, a7, a4
l32i a4, a4, 0
movi a5, sys_ni_syscall;
beq a4, a5, 1f
@@ -1881,6 +1889,10 @@ ENTRY(system_call)
1: /* regs->areg[2] = return_value */
s32i a6, a2, PT_AREG2
bnez a3, 1f
retw
1:
mov a6, a2
call4 do_syscall_trace_leave
retw