^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) // SPDX-License-Identifier: GPL-2.0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) * S390 version
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) * Copyright IBM Corp. 1999, 2000
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) * Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) * Thomas Spatzier (tspat@de.ibm.com)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) * Derived from "arch/i386/kernel/sys_i386.c"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) * This file contains various random system calls that
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) * have a non-standard calling sequence on the Linux/s390
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) * platform.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) #include <linux/errno.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) #include <linux/sched.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) #include <linux/mm.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) #include <linux/fs.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) #include <linux/smp.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) #include <linux/sem.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) #include <linux/msg.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) #include <linux/shm.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) #include <linux/stat.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) #include <linux/syscalls.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) #include <linux/mman.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) #include <linux/file.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) #include <linux/utsname.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) #include <linux/personality.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) #include <linux/unistd.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) #include <linux/ipc.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) #include <linux/uaccess.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) #include "entry.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) * Perform the mmap() system call. Linux for S/390 isn't able to handle more
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) * than 5 system call parameters, so this system call uses a memory block
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) * for parameter passing.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) struct s390_mmap_arg_struct {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) unsigned long addr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) unsigned long len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) unsigned long prot;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) unsigned long flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) unsigned long fd;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) unsigned long offset;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) SYSCALL_DEFINE1(mmap2, struct s390_mmap_arg_struct __user *, arg)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) struct s390_mmap_arg_struct a;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) int error = -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) if (copy_from_user(&a, arg, sizeof(a)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) error = ksys_mmap_pgoff(a.addr, a.len, a.prot, a.flags, a.fd, a.offset);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) return error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) #ifdef CONFIG_SYSVIPC
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) * sys_ipc() is the de-multiplexer for the SysV IPC calls.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) SYSCALL_DEFINE5(s390_ipc, uint, call, int, first, unsigned long, second,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) unsigned long, third, void __user *, ptr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) if (call >> 16)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) /* The s390 sys_ipc variant has only five parameters instead of six
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) * like the generic variant. The only difference is the handling of
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) * the SEMTIMEDOP subcall where on s390 the third parameter is used
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) * as a pointer to a struct timespec where the generic variant uses
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) * the fifth parameter.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) * Therefore we can call the generic variant by simply passing the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) * third parameter also as fifth parameter.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) return ksys_ipc(call, first, second, third, ptr, third);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) #endif /* CONFIG_SYSVIPC */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) SYSCALL_DEFINE1(s390_personality, unsigned int, personality)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) unsigned int ret = current->personality;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) if (personality(current->personality) == PER_LINUX32 &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) personality(personality) == PER_LINUX)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) personality |= PER_LINUX32;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) if (personality != 0xffffffff)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) set_personality(personality);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) if (personality(ret) == PER_LINUX32)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) ret &= ~PER_LINUX32;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) SYSCALL_DEFINE0(ni_syscall)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) return -ENOSYS;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) }
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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