b497ef570e
xtensa, uses a nonstandard variation of the generic sysvipc data structures, intended to have the padding moved around so it can deal with big-endian 32-bit user space that has 64-bit time_t. xtensa tries hard to define the structures so they work in both big-endian and little-endian systems with padding on the right side. However, they only succeeded for for two of the three structures, and their struct shmid64_ds ended up being defined in two identical copies, and the big-endian one is wrong. This takes just take the same approach here that we have for the asm-generic headers and adds separate 32-bit fields for the upper halves of the timestamps, to let libc deal with the mess in user space. Signed-off-by: Arnd Bergmann <arnd@arndb.de>
51 lines
1.5 KiB
C
51 lines
1.5 KiB
C
/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
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/*
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* include/asm-xtensa/shmbuf.h
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*
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* The shmid64_ds structure for Xtensa architecture.
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* Note extra padding because this structure is passed back and forth
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* between kernel and user space, but the padding is on the wrong
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* side for big-endian xtensa, for historic reasons.
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*
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* Pad space is left for:
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* - 2 miscellaneous 32-bit values
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*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*
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* Copyright (C) 2001 - 2005 Tensilica Inc.
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*/
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#ifndef _XTENSA_SHMBUF_H
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#define _XTENSA_SHMBUF_H
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struct shmid64_ds {
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struct ipc64_perm shm_perm; /* operation perms */
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size_t shm_segsz; /* size of segment (bytes) */
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unsigned long shm_atime; /* last attach time */
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unsigned long shm_atime_high;
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unsigned long shm_dtime; /* last detach time */
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unsigned long shm_dtime_high;
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unsigned long shm_ctime; /* last change time */
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unsigned long shm_ctime_high;
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__kernel_pid_t shm_cpid; /* pid of creator */
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__kernel_pid_t shm_lpid; /* pid of last operator */
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unsigned long shm_nattch; /* no. of current attaches */
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unsigned long __unused4;
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unsigned long __unused5;
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};
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struct shminfo64 {
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unsigned long shmmax;
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unsigned long shmmin;
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unsigned long shmmni;
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unsigned long shmseg;
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unsigned long shmall;
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unsigned long __unused1;
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unsigned long __unused2;
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unsigned long __unused3;
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unsigned long __unused4;
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};
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#endif /* _XTENSA_SHMBUF_H */
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