Dmitry V. Levin
92e347b556
We do our best to keep copyright headers up to date, yet git history provides better information on this subject and is more accurate than copyright headers.
36 lines
936 B
C
36 lines
936 B
C
/*
|
|
* Copyright (c) 2015-2018 The strace developers.
|
|
* All rights reserved.
|
|
*
|
|
* SPDX-License-Identifier: LGPL-2.1-or-later
|
|
*/
|
|
|
|
kernel_ulong_t
|
|
shuffle_scno(kernel_ulong_t scno)
|
|
{
|
|
if (scno < ARM_FIRST_SHUFFLED_SYSCALL)
|
|
return scno;
|
|
|
|
/* __ARM_NR_cmpxchg? Swap with LAST_ORDINARY+1 */
|
|
if (scno == ARM_FIRST_SHUFFLED_SYSCALL)
|
|
return 0x000ffff0;
|
|
if (scno == 0x000ffff0)
|
|
return ARM_FIRST_SHUFFLED_SYSCALL;
|
|
|
|
#define ARM_SECOND_SHUFFLED_SYSCALL (ARM_FIRST_SHUFFLED_SYSCALL + 1)
|
|
/*
|
|
* Is it ARM specific syscall?
|
|
* Swap [0x000f0000, 0x000f0000 + LAST_SPECIAL] range
|
|
* with [SECOND_SHUFFLED, SECOND_SHUFFLED + LAST_SPECIAL] range.
|
|
*/
|
|
if (scno >= 0x000f0000 &&
|
|
scno <= 0x000f0000 + ARM_LAST_SPECIAL_SYSCALL) {
|
|
return scno - 0x000f0000 + ARM_SECOND_SHUFFLED_SYSCALL;
|
|
}
|
|
if (scno <= ARM_SECOND_SHUFFLED_SYSCALL + ARM_LAST_SPECIAL_SYSCALL) {
|
|
return scno + 0x000f0000 - ARM_SECOND_SHUFFLED_SYSCALL;
|
|
}
|
|
|
|
return scno;
|
|
}
|