// SPDX-License-Identifier: GPL-2.0 /* * S390 version * Copyright IBM Corp. 1999, 2000 * Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com), * Thomas Spatzier (tspat@de.ibm.com) * * Derived from "arch/i386/kernel/sys_i386.c" * * This file contains various random system calls that * have a non-standard calling sequence on the Linux/s390 * platform. */ #include <linux/errno.h> #include <linux/sched.h> #include <linux/mm.h> #include <linux/fs.h> #include <linux/smp.h> #include <linux/sem.h> #include <linux/msg.h> #include <linux/shm.h> #include <linux/stat.h> #include <linux/syscalls.h> #include <linux/mman.h> #include <linux/file.h> #include <linux/utsname.h> #include <linux/personality.h> #include <linux/unistd.h> #include <linux/ipc.h> #include <linux/uaccess.h> #include "entry.h" /* * Perform the mmap() system call. Linux for S/390 isn't able to handle more * than 5 system call parameters, so this system call uses a memory block * for parameter passing. */ struct s390_mmap_arg_struct { unsigned long addr; unsigned long len; unsigned long prot; unsigned long flags; unsigned long fd; unsigned long offset; }; SYSCALL_DEFINE1(mmap2, struct s390_mmap_arg_struct __user *, arg) { struct s390_mmap_arg_struct a; int error = -EFAULT; if (copy_from_user(&a, arg, sizeof(a))) goto out; error = ksys_mmap_pgoff(a.addr, a.len, a.prot, a.flags, a.fd, a.offset); out: return error; } #ifdef CONFIG_SYSVIPC /* * sys_ipc() is the de-multiplexer for the SysV IPC calls. */ SYSCALL_DEFINE5(s390_ipc, uint, call, int, first, unsigned long, second, unsigned long, third, void __user *, ptr) { if (call >> 16) return -EINVAL; /* The s390 sys_ipc variant has only five parameters instead of six * like the generic variant. The only difference is the handling of * the SEMTIMEDOP subcall where on s390 the third parameter is used * as a pointer to a struct timespec where the generic variant uses * the fifth parameter. * Therefore we can call the generic variant by simply passing the * third parameter also as fifth parameter. */ return ksys_ipc(call, first, second, third, ptr, third); } #endif /* CONFIG_SYSVIPC */ SYSCALL_DEFINE1(s390_personality, unsigned int, personality) { unsigned int ret = current->personality; if (personality(current->personality) == PER_LINUX32 && personality(personality) == PER_LINUX) personality |= PER_LINUX32; if (personality != 0xffffffff) set_personality(personality); if (personality(ret) == PER_LINUX32) ret &= ~PER_LINUX32; return ret; } SYSCALL_DEFINE0(ni_syscall) { return -ENOSYS; }