Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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/smp.h> |
| 20 | #include <linux/smp_lock.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 | #ifdef CONFIG_ARCH_S390X |
| 30 | #include <linux/personality.h> |
| 31 | #endif /* CONFIG_ARCH_S390X */ |
| 32 | |
| 33 | #include <asm/uaccess.h> |
| 34 | #include <asm/ipc.h> |
| 35 | |
| 36 | /* |
| 37 | * sys_pipe() is the normal C calling standard for creating |
| 38 | * a pipe. It's not the way Unix traditionally does this, though. |
| 39 | */ |
| 40 | asmlinkage long sys_pipe(unsigned long __user *fildes) |
| 41 | { |
| 42 | int fd[2]; |
| 43 | int error; |
| 44 | |
| 45 | error = do_pipe(fd); |
| 46 | if (!error) { |
| 47 | if (copy_to_user(fildes, fd, 2*sizeof(int))) |
| 48 | error = -EFAULT; |
| 49 | } |
| 50 | return error; |
| 51 | } |
| 52 | |
| 53 | /* common code for old and new mmaps */ |
| 54 | static inline long do_mmap2( |
| 55 | unsigned long addr, unsigned long len, |
| 56 | unsigned long prot, unsigned long flags, |
| 57 | unsigned long fd, unsigned long pgoff) |
| 58 | { |
| 59 | long error = -EBADF; |
| 60 | struct file * file = NULL; |
| 61 | |
| 62 | flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE); |
| 63 | if (!(flags & MAP_ANONYMOUS)) { |
| 64 | file = fget(fd); |
| 65 | if (!file) |
| 66 | goto out; |
| 67 | } |
| 68 | |
| 69 | down_write(¤t->mm->mmap_sem); |
| 70 | error = do_mmap_pgoff(file, addr, len, prot, flags, pgoff); |
| 71 | up_write(¤t->mm->mmap_sem); |
| 72 | |
| 73 | if (file) |
| 74 | fput(file); |
| 75 | out: |
| 76 | return error; |
| 77 | } |
| 78 | |
| 79 | /* |
| 80 | * Perform the select(nd, in, out, ex, tv) and mmap() system |
| 81 | * calls. Linux for S/390 isn't able to handle more than 5 |
| 82 | * system call parameters, so these system calls used a memory |
| 83 | * block for parameter passing.. |
| 84 | */ |
| 85 | |
| 86 | struct mmap_arg_struct { |
| 87 | unsigned long addr; |
| 88 | unsigned long len; |
| 89 | unsigned long prot; |
| 90 | unsigned long flags; |
| 91 | unsigned long fd; |
| 92 | unsigned long offset; |
| 93 | }; |
| 94 | |
| 95 | asmlinkage long sys_mmap2(struct mmap_arg_struct __user *arg) |
| 96 | { |
| 97 | struct mmap_arg_struct a; |
| 98 | int error = -EFAULT; |
| 99 | |
| 100 | if (copy_from_user(&a, arg, sizeof(a))) |
| 101 | goto out; |
| 102 | error = do_mmap2(a.addr, a.len, a.prot, a.flags, a.fd, a.offset); |
| 103 | out: |
| 104 | return error; |
| 105 | } |
| 106 | |
| 107 | asmlinkage long old_mmap(struct mmap_arg_struct __user *arg) |
| 108 | { |
| 109 | struct mmap_arg_struct a; |
| 110 | long error = -EFAULT; |
| 111 | |
| 112 | if (copy_from_user(&a, arg, sizeof(a))) |
| 113 | goto out; |
| 114 | |
| 115 | error = -EINVAL; |
| 116 | if (a.offset & ~PAGE_MASK) |
| 117 | goto out; |
| 118 | |
| 119 | error = do_mmap2(a.addr, a.len, a.prot, a.flags, a.fd, a.offset >> PAGE_SHIFT); |
| 120 | out: |
| 121 | return error; |
| 122 | } |
| 123 | |
| 124 | #ifndef CONFIG_ARCH_S390X |
| 125 | struct sel_arg_struct { |
| 126 | unsigned long n; |
| 127 | fd_set *inp, *outp, *exp; |
| 128 | struct timeval *tvp; |
| 129 | }; |
| 130 | |
| 131 | asmlinkage long old_select(struct sel_arg_struct __user *arg) |
| 132 | { |
| 133 | struct sel_arg_struct a; |
| 134 | |
| 135 | if (copy_from_user(&a, arg, sizeof(a))) |
| 136 | return -EFAULT; |
| 137 | /* sys_select() does the appropriate kernel locking */ |
| 138 | return sys_select(a.n, a.inp, a.outp, a.exp, a.tvp); |
| 139 | |
| 140 | } |
| 141 | #endif /* CONFIG_ARCH_S390X */ |
| 142 | |
| 143 | /* |
| 144 | * sys_ipc() is the de-multiplexer for the SysV IPC calls.. |
| 145 | * |
| 146 | * This is really horribly ugly. |
| 147 | */ |
| 148 | asmlinkage long sys_ipc(uint call, int first, unsigned long second, |
| 149 | unsigned long third, void __user *ptr) |
| 150 | { |
| 151 | struct ipc_kludge tmp; |
| 152 | int ret; |
| 153 | |
| 154 | switch (call) { |
| 155 | case SEMOP: |
| 156 | return sys_semtimedop(first, (struct sembuf __user *)ptr, |
| 157 | (unsigned)second, NULL); |
| 158 | case SEMTIMEDOP: |
| 159 | return sys_semtimedop(first, (struct sembuf __user *)ptr, |
| 160 | (unsigned)second, |
| 161 | (const struct timespec __user *) third); |
| 162 | case SEMGET: |
| 163 | return sys_semget(first, (int)second, third); |
| 164 | case SEMCTL: { |
| 165 | union semun fourth; |
| 166 | if (!ptr) |
| 167 | return -EINVAL; |
| 168 | if (get_user(fourth.__pad, (void __user * __user *) ptr)) |
| 169 | return -EFAULT; |
| 170 | return sys_semctl(first, (int)second, third, fourth); |
| 171 | } |
| 172 | case MSGSND: |
| 173 | return sys_msgsnd (first, (struct msgbuf __user *) ptr, |
| 174 | (size_t)second, third); |
| 175 | break; |
| 176 | case MSGRCV: |
| 177 | if (!ptr) |
| 178 | return -EINVAL; |
| 179 | if (copy_from_user (&tmp, (struct ipc_kludge __user *) ptr, |
| 180 | sizeof (struct ipc_kludge))) |
| 181 | return -EFAULT; |
| 182 | return sys_msgrcv (first, tmp.msgp, |
| 183 | (size_t)second, tmp.msgtyp, third); |
| 184 | case MSGGET: |
| 185 | return sys_msgget((key_t)first, (int)second); |
| 186 | case MSGCTL: |
| 187 | return sys_msgctl(first, (int)second, |
| 188 | (struct msqid_ds __user *)ptr); |
| 189 | |
| 190 | case SHMAT: { |
| 191 | ulong raddr; |
| 192 | ret = do_shmat(first, (char __user *)ptr, |
| 193 | (int)second, &raddr); |
| 194 | if (ret) |
| 195 | return ret; |
| 196 | return put_user (raddr, (ulong __user *) third); |
| 197 | break; |
| 198 | } |
| 199 | case SHMDT: |
| 200 | return sys_shmdt ((char __user *)ptr); |
| 201 | case SHMGET: |
| 202 | return sys_shmget(first, (size_t)second, third); |
| 203 | case SHMCTL: |
| 204 | return sys_shmctl(first, (int)second, |
| 205 | (struct shmid_ds __user *) ptr); |
| 206 | default: |
| 207 | return -ENOSYS; |
| 208 | |
| 209 | } |
| 210 | |
| 211 | return -EINVAL; |
| 212 | } |
| 213 | |
| 214 | #ifdef CONFIG_ARCH_S390X |
| 215 | asmlinkage long s390x_newuname(struct new_utsname __user *name) |
| 216 | { |
| 217 | int ret = sys_newuname(name); |
| 218 | |
| 219 | if (current->personality == PER_LINUX32 && !ret) { |
| 220 | ret = copy_to_user(name->machine, "s390\0\0\0\0", 8); |
| 221 | if (ret) ret = -EFAULT; |
| 222 | } |
| 223 | return ret; |
| 224 | } |
| 225 | |
| 226 | asmlinkage long s390x_personality(unsigned long personality) |
| 227 | { |
| 228 | int ret; |
| 229 | |
| 230 | if (current->personality == PER_LINUX32 && personality == PER_LINUX) |
| 231 | personality = PER_LINUX32; |
| 232 | ret = sys_personality(personality); |
| 233 | if (ret == PER_LINUX32) |
| 234 | ret = PER_LINUX; |
| 235 | |
| 236 | return ret; |
| 237 | } |
| 238 | #endif /* CONFIG_ARCH_S390X */ |
| 239 | |
| 240 | /* |
| 241 | * Wrapper function for sys_fadvise64/fadvise64_64 |
| 242 | */ |
| 243 | #ifndef CONFIG_ARCH_S390X |
| 244 | |
| 245 | asmlinkage long |
| 246 | s390_fadvise64(int fd, u32 offset_high, u32 offset_low, size_t len, int advice) |
| 247 | { |
| 248 | return sys_fadvise64(fd, (u64) offset_high << 32 | offset_low, |
| 249 | len, advice); |
| 250 | } |
| 251 | |
| 252 | #endif |
| 253 | |
| 254 | struct fadvise64_64_args { |
| 255 | int fd; |
| 256 | long long offset; |
| 257 | long long len; |
| 258 | int advice; |
| 259 | }; |
| 260 | |
| 261 | asmlinkage long |
| 262 | s390_fadvise64_64(struct fadvise64_64_args __user *args) |
| 263 | { |
| 264 | struct fadvise64_64_args a; |
| 265 | |
| 266 | if ( copy_from_user(&a, args, sizeof(a)) ) |
| 267 | return -EFAULT; |
| 268 | return sys_fadvise64_64(a.fd, a.offset, a.len, a.advice); |
| 269 | } |
| 270 | |