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y2038: mips: Extend sysvipc data structures
MIPS is the weirdest case for sysvipc, because each of the three data structures is done differently: * msqid64_ds has padding in the right place so we could in theory extend this one to just have 64-bit values instead of time_t. As this does not work for most of the other combinations, we just handle it in the common manner though. * semid64_ds has no padding for 64-bit time_t, but has two reserved 'long' fields, which are sufficient to extend the sem_otime and sem_ctime fields to 64 bit. In order to do this, the libc implementation will have to copy the data into another structure that has the fields in a different order. MIPS is the only architecture with this problem, so this is best done in MIPS specific libc code. * shmid64_ds is slightly worse than that, because it has three time_t fields but only two unused 32-bit words. As a workaround, we extend each field only by 16 bits, ending up with 48-bit timestamps that user space again has to work around by itself. The compat versions of the data structures are changed in the same way. Signed-off-by: Arnd Bergmann <arnd@arndb.de>
This commit is contained in:
Arnd Bergmann
parent
83335eb4f6
commit
3f3a4b3fbf
@ -37,9 +37,11 @@ typedef struct {
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typedef s32 compat_timer_t;
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typedef s32 compat_key_t;
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typedef s16 compat_short_t;
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typedef s32 compat_int_t;
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typedef s32 compat_long_t;
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typedef s64 compat_s64;
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typedef u16 compat_ushort_t;
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typedef u32 compat_uint_t;
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typedef u32 compat_ulong_t;
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typedef u64 compat_u64;
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@ -157,35 +159,35 @@ struct compat_ipc64_perm {
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struct compat_semid64_ds {
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struct compat_ipc64_perm sem_perm;
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compat_time_t sem_otime;
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compat_time_t sem_ctime;
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compat_ulong_t sem_otime;
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compat_ulong_t sem_ctime;
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compat_ulong_t sem_nsems;
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compat_ulong_t __unused1;
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compat_ulong_t __unused2;
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compat_ulong_t sem_otime_high;
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compat_ulong_t sem_ctime_high;
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};
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struct compat_msqid64_ds {
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struct compat_ipc64_perm msg_perm;
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#ifndef CONFIG_CPU_LITTLE_ENDIAN
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compat_ulong_t __unused1;
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compat_ulong_t msg_stime_high;
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#endif
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compat_time_t msg_stime;
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compat_ulong_t msg_stime;
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#ifdef CONFIG_CPU_LITTLE_ENDIAN
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compat_ulong_t __unused1;
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compat_ulong_t msg_stime_high;
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#endif
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#ifndef CONFIG_CPU_LITTLE_ENDIAN
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compat_ulong_t __unused2;
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compat_ulong_t msg_rtime_high;
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#endif
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compat_time_t msg_rtime;
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compat_ulong_t msg_rtime;
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#ifdef CONFIG_CPU_LITTLE_ENDIAN
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compat_ulong_t __unused2;
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compat_ulong_t msg_rtime_high;
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#endif
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#ifndef CONFIG_CPU_LITTLE_ENDIAN
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compat_ulong_t __unused3;
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compat_ulong_t msg_ctime_high;
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#endif
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compat_time_t msg_ctime;
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compat_ulong_t msg_ctime;
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#ifdef CONFIG_CPU_LITTLE_ENDIAN
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compat_ulong_t __unused3;
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compat_ulong_t msg_ctime_high;
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#endif
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compat_ulong_t msg_cbytes;
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compat_ulong_t msg_qnum;
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@ -199,14 +201,16 @@ struct compat_msqid64_ds {
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struct compat_shmid64_ds {
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struct compat_ipc64_perm shm_perm;
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compat_size_t shm_segsz;
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compat_time_t shm_atime;
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compat_time_t shm_dtime;
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compat_time_t shm_ctime;
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compat_ulong_t shm_atime;
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compat_ulong_t shm_dtime;
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compat_ulong_t shm_ctime;
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compat_pid_t shm_cpid;
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compat_pid_t shm_lpid;
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compat_ulong_t shm_nattch;
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compat_ulong_t __unused1;
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compat_ulong_t __unused2;
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compat_ushort_t shm_atime_high;
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compat_ushort_t shm_dtime_high;
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compat_ushort_t shm_ctime_high;
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compat_ushort_t __unused2;
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};
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/* MIPS has unusual order of fields in stack_t */
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@ -9,33 +9,15 @@
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* between kernel and user space.
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*
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* Pad space is left for:
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* - extension of time_t to 64-bit on 32-bitsystem to solve the y2038 problem
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* - 2 miscellaneous unsigned long values
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*/
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#if defined(__mips64)
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struct msqid64_ds {
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struct ipc64_perm msg_perm;
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#if !defined(__mips64) && defined(__MIPSEB__)
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unsigned long __unused1;
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#endif
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__kernel_time_t msg_stime; /* last msgsnd time */
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#if !defined(__mips64) && defined(__MIPSEL__)
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unsigned long __unused1;
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#endif
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#if !defined(__mips64) && defined(__MIPSEB__)
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unsigned long __unused2;
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#endif
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__kernel_time_t msg_rtime; /* last msgrcv time */
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#if !defined(__mips64) && defined(__MIPSEL__)
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unsigned long __unused2;
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#endif
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#if !defined(__mips64) && defined(__MIPSEB__)
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unsigned long __unused3;
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#endif
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__kernel_time_t msg_ctime; /* last change time */
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#if !defined(__mips64) && defined(__MIPSEL__)
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unsigned long __unused3;
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#endif
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unsigned long msg_cbytes; /* current number of bytes on queue */
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unsigned long msg_qnum; /* number of messages in queue */
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unsigned long msg_qbytes; /* max number of bytes on queue */
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@ -44,5 +26,42 @@ struct msqid64_ds {
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unsigned long __unused4;
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unsigned long __unused5;
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};
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#elif defined (__MIPSEB__)
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struct msqid64_ds {
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struct ipc64_perm msg_perm;
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unsigned long msg_stime_high;
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unsigned long msg_stime; /* last msgsnd time */
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unsigned long msg_rtime_high;
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unsigned long msg_rtime; /* last msgrcv time */
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unsigned long msg_ctime_high;
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unsigned long msg_ctime; /* last change time */
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unsigned long msg_cbytes; /* current number of bytes on queue */
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unsigned long msg_qnum; /* number of messages in queue */
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unsigned long msg_qbytes; /* max number of bytes on queue */
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__kernel_pid_t msg_lspid; /* pid of last msgsnd */
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__kernel_pid_t msg_lrpid; /* last receive pid */
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unsigned long __unused4;
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unsigned long __unused5;
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};
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#elif defined (__MIPSEL__)
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struct msqid64_ds {
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struct ipc64_perm msg_perm;
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unsigned long msg_stime; /* last msgsnd time */
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unsigned long msg_stime_high;
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unsigned long msg_rtime; /* last msgrcv time */
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unsigned long msg_rtime_high;
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unsigned long msg_ctime; /* last change time */
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unsigned long msg_ctime_high;
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unsigned long msg_cbytes; /* current number of bytes on queue */
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unsigned long msg_qnum; /* number of messages in queue */
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unsigned long msg_qbytes; /* max number of bytes on queue */
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__kernel_pid_t msg_lspid; /* pid of last msgsnd */
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__kernel_pid_t msg_lrpid; /* last receive pid */
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unsigned long __unused4;
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unsigned long __unused5;
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};
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#else
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#warning no endianess set
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#endif
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#endif /* _ASM_MSGBUF_H */
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@ -7,10 +7,11 @@
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* Note extra padding because this structure is passed back and forth
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* between kernel and user space.
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*
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* Pad space is left for:
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* - 2 miscellaneous 64-bit values
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* Pad space is left for 2 miscellaneous 64-bit values on mips64,
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* but used for the upper 32 bit of the time values on mips32.
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*/
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#ifdef __mips64
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struct semid64_ds {
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struct ipc64_perm sem_perm; /* permissions .. see ipc.h */
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__kernel_time_t sem_otime; /* last semop time */
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@ -19,5 +20,15 @@ struct semid64_ds {
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unsigned long __unused1;
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unsigned long __unused2;
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};
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#else
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struct semid64_ds {
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struct ipc64_perm sem_perm; /* permissions .. see ipc.h */
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unsigned long sem_otime; /* last semop time */
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unsigned long sem_ctime; /* last change time */
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unsigned long sem_nsems; /* no. of semaphores in array */
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unsigned long sem_otime_high;
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unsigned long sem_ctime_high;
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};
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#endif
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#endif /* _ASM_SEMBUF_H */
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@ -7,10 +7,13 @@
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* Note extra padding because this structure is passed back and forth
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* between kernel and user space.
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*
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* Pad space is left for:
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* - 2 miscellaneous 32-bit rsp. 64-bit values
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* As MIPS was lacking proper padding after shm_?time, we use 48 bits
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* of the padding at the end to store a few additional bits of the time.
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* libc implementations need to take care to convert this into a proper
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* data structure when moving to 64-bit time_t.
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*/
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#ifdef __mips64
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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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@ -23,6 +26,22 @@ struct shmid64_ds {
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unsigned long __unused1;
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unsigned long __unused2;
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};
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#else
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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_dtime; /* last detach time */
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unsigned long shm_ctime; /* last change time */
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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 short shm_atime_high;
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unsigned short shm_dtime_high;
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unsigned short shm_ctime_high;
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unsigned short __unused1;
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};
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#endif
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struct shminfo64 {
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unsigned long shmmax;
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