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xtensa: use actual syscall number in do_syscall_trace_leave

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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>
This commit is contained in:
Max Filippov 2019-04-03 20:19:25 -07:00
parent 79a3aaa7b8
commit 2201f31f2c
1 changed files with 6 additions and 0 deletions
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6
arch/xtensa/kernel/entry.S
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@ -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)