1/* 2 * arch/s390/kernel/sys_s390.c 3 * 4 * S390 version 5 * Copyright (C) 1999,2000 IBM Deutschland Entwicklung GmbH, IBM Corporation 6 * Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com), 7 * Thomas Spatzier (tspat@de.ibm.com) 8 * 9 * Derived from "arch/i386/kernel/sys_i386.c" 10 * 11 * This file contains various random system calls that 12 * have a non-standard calling sequence on the Linux/s390 13 * platform. 14 */ 15 16#include <linux/errno.h> 17#include <linux/sched.h> 18#include <linux/mm.h> 19#include <linux/fs.h> 20#include <linux/smp.h> 21#include <linux/sem.h> 22#include <linux/msg.h> 23#include <linux/shm.h> 24#include <linux/stat.h> 25#include <linux/syscalls.h> 26#include <linux/mman.h> 27#include <linux/file.h> 28#include <linux/utsname.h> 29#include <linux/personality.h> 30#include <linux/unistd.h> 31#include <linux/ipc.h> 32#include <asm/uaccess.h> 33#include "entry.h" 34 35/* 36 * Perform the mmap() system call. Linux for S/390 isn't able to handle more 37 * than 5 system call parameters, so this system call uses a memory block 38 * for parameter passing. 39 */ 40 41struct s390_mmap_arg_struct { 42 unsigned long addr; 43 unsigned long len; 44 unsigned long prot; 45 unsigned long flags; 46 unsigned long fd; 47 unsigned long offset; 48}; 49 50SYSCALL_DEFINE1(mmap2, struct s390_mmap_arg_struct __user *, arg) 51{ 52 struct s390_mmap_arg_struct a; 53 int error = -EFAULT; 54 55 if (copy_from_user(&a, arg, sizeof(a))) 56 goto out; 57 error = sys_mmap_pgoff(a.addr, a.len, a.prot, a.flags, a.fd, a.offset); 58out: 59 return error; 60} 61 62/* 63 * sys_ipc() is the de-multiplexer for the SysV IPC calls.. 64 * 65 * This is really horribly ugly. 66 */ 67SYSCALL_DEFINE5(s390_ipc, uint, call, int, first, unsigned long, second, 68 unsigned long, third, void __user *, ptr) 69{ 70 struct ipc_kludge tmp; 71 int ret; 72 73 switch (call) { 74 case SEMOP: 75 return sys_semtimedop(first, (struct sembuf __user *)ptr, 76 (unsigned)second, NULL); 77 case SEMTIMEDOP: 78 return sys_semtimedop(first, (struct sembuf __user *)ptr, 79 (unsigned)second, 80 (const struct timespec __user *) third); 81 case SEMGET: 82 return sys_semget(first, (int)second, third); 83 case SEMCTL: { 84 union semun fourth; 85 if (!ptr) 86 return -EINVAL; 87 if (get_user(fourth.__pad, (void __user * __user *) ptr)) 88 return -EFAULT; 89 return sys_semctl(first, (int)second, third, fourth); 90 } 91 case MSGSND: 92 return sys_msgsnd (first, (struct msgbuf __user *) ptr, 93 (size_t)second, third); 94 break; 95 case MSGRCV: 96 if (!ptr) 97 return -EINVAL; 98 if (copy_from_user (&tmp, (struct ipc_kludge __user *) ptr, 99 sizeof (struct ipc_kludge))) 100 return -EFAULT; 101 return sys_msgrcv (first, tmp.msgp, 102 (size_t)second, tmp.msgtyp, third); 103 case MSGGET: 104 return sys_msgget((key_t)first, (int)second); 105 case MSGCTL: 106 return sys_msgctl(first, (int)second, 107 (struct msqid_ds __user *)ptr); 108 109 case SHMAT: { 110 ulong raddr; 111 ret = do_shmat(first, (char __user *)ptr, 112 (int)second, &raddr); 113 if (ret) 114 return ret; 115 return put_user (raddr, (ulong __user *) third); 116 break; 117 } 118 case SHMDT: 119 return sys_shmdt ((char __user *)ptr); 120 case SHMGET: 121 return sys_shmget(first, (size_t)second, third); 122 case SHMCTL: 123 return sys_shmctl(first, (int)second, 124 (struct shmid_ds __user *) ptr); 125 default: 126 return -ENOSYS; 127 128 } 129 130 return -EINVAL; 131} 132 133#ifdef CONFIG_64BIT 134SYSCALL_DEFINE1(s390_personality, unsigned int, personality) 135{ 136 unsigned int ret; 137 138 if (current->personality == PER_LINUX32 && personality == PER_LINUX) 139 personality = PER_LINUX32; 140 ret = sys_personality(personality); 141 if (ret == PER_LINUX32) 142 ret = PER_LINUX; 143 144 return ret; 145} 146#endif /* CONFIG_64BIT */ 147 148/* 149 * Wrapper function for sys_fadvise64/fadvise64_64 150 */ 151#ifndef CONFIG_64BIT 152 153SYSCALL_DEFINE5(s390_fadvise64, int, fd, u32, offset_high, u32, offset_low, 154 size_t, len, int, advice) 155{ 156 return sys_fadvise64(fd, (u64) offset_high << 32 | offset_low, 157 len, advice); 158} 159 160struct fadvise64_64_args { 161 int fd; 162 long long offset; 163 long long len; 164 int advice; 165}; 166 167SYSCALL_DEFINE1(s390_fadvise64_64, struct fadvise64_64_args __user *, args) 168{ 169 struct fadvise64_64_args a; 170 171 if ( copy_from_user(&a, args, sizeof(a)) ) 172 return -EFAULT; 173 return sys_fadvise64_64(a.fd, a.offset, a.len, a.advice); 174} 175 176/* 177 * This is a wrapper to call sys_fallocate(). For 31 bit s390 the last 178 * 64 bit argument "len" is split into the upper and lower 32 bits. The 179 * system call wrapper in the user space loads the value to %r6/%r7. 180 * The code in entry.S keeps the values in %r2 - %r6 where they are and 181 * stores %r7 to 96(%r15). But the standard C linkage requires that 182 * the whole 64 bit value for len is stored on the stack and doesn't 183 * use %r6 at all. So s390_fallocate has to convert the arguments from 184 * %r2: fd, %r3: mode, %r4/%r5: offset, %r6/96(%r15)-99(%r15): len 185 * to 186 * %r2: fd, %r3: mode, %r4/%r5: offset, 96(%r15)-103(%r15): len 187 */ 188SYSCALL_DEFINE(s390_fallocate)(int fd, int mode, loff_t offset, 189 u32 len_high, u32 len_low) 190{ 191 return sys_fallocate(fd, mode, offset, ((u64)len_high << 32) | len_low); 192} 193#ifdef CONFIG_HAVE_SYSCALL_WRAPPERS 194asmlinkage long SyS_s390_fallocate(long fd, long mode, loff_t offset, 195 long len_high, long len_low) 196{ 197 return SYSC_s390_fallocate((int) fd, (int) mode, offset, 198 (u32) len_high, (u32) len_low); 199} 200SYSCALL_ALIAS(sys_s390_fallocate, SyS_s390_fallocate); 201#endif 202 203#endif 204