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