arch/parisc/kernel/sys_parisc32.c

   1 /*
   2  * sys_parisc32.c: Conversion between 32bit and 64bit native syscalls.
   3  *
   4  * Copyright (C) 2000-2001 Hewlett Packard Company
   5  * Copyright (C) 2000 John Marvin
   6  * Copyright (C) 2001 Matthew Wilcox
   7  *
   8  * These routines maintain argument size conversion between 32bit and 64bit
   9  * environment. Based heavily on sys_ia32.c and sys_sparc32.c.
  10  */
  11
  12 #include <linux/compat.h>
  13 #include <linux/kernel.h>
  14 #include <linux/sched.h>
  15 #include <linux/fs.h>
  16 #include <linux/mm.h>
  17 #include <linux/file.h>
  18 #include <linux/signal.h>
  19 #include <linux/resource.h>
  20 #include <linux/times.h>
  21 #include <linux/time.h>
  22 #include <linux/smp.h>
  23 #include <linux/smp_lock.h>
  24 #include <linux/sem.h>
  25 #include <linux/msg.h>
  26 #include <linux/shm.h>
  27 #include <linux/slab.h>
  28 #include <linux/uio.h>
  29 #include <linux/ncp_fs.h>
  30 #include <linux/poll.h>
  31 #include <linux/personality.h>
  32 #include <linux/stat.h>
  33 #include <linux/highmem.h>
  34 #include <linux/highuid.h>
  35 #include <linux/mman.h>
  36 #include <linux/binfmts.h>
  37 #include <linux/namei.h>
  38 #include <linux/vfs.h>
  39 #include <linux/ptrace.h>
  40 #include <linux/swap.h>
  41 #include <linux/syscalls.h>
  42
  43 #include <asm/types.h>
  44 #include <asm/uaccess.h>
  45 #include <asm/mmu_context.h>
  46
  47 #include "sys32.h"
  48
  49 #undef DEBUG
  50
  51 #ifdef DEBUG
  52 #define DBG(x)  printk x
  53 #else
  54 #define DBG(x)
  55 #endif
  56
  57 /*
  58  * sys32_execve() executes a new program.
  59  */
  60
  61 asmlinkage int sys32_execve(struct pt_regs *regs)
  62 {
  63         int error;
  64         char *filename;
  65
  66         DBG(("sys32_execve(%p) r26 = 0x%lx\n", regs, regs->gr[26]));
  67         filename = getname((const char __user *) regs->gr[26]);
  68         error = PTR_ERR(filename);
  69         if (IS_ERR(filename))
  70                 goto out;
  71         error = compat_do_execve(filename, compat_ptr(regs->gr[25]),
  72                                  compat_ptr(regs->gr[24]), regs);
  73         putname(filename);
  74 out:
  75
  76         return error;
  77 }
  78
  79 asmlinkage long sys32_unimplemented(int r26, int r25, int r24, int r23,
  80         int r22, int r21, int r20)
  81 {
  82     printk(KERN_ERR "%s(%d): Unimplemented 32 on 64 syscall #%d!\n",
  83         current->comm, current->pid, r20);
  84     return -ENOSYS;
  85 }
  86
  87 asmlinkage long sys32_sched_rr_get_interval(pid_t pid,
  88         struct compat_timespec __user *interval)
  89 {
  90         struct timespec t;
  91         int ret;
  92
  93         KERNEL_SYSCALL(ret, sys_sched_rr_get_interval, pid, (struct timespec __user *)&t);
  94         if (put_compat_timespec(&t, interval))
  95                 return -EFAULT;
  96         return ret;
  97 }
  98
  99 struct msgbuf32 {
 100     int mtype;
 101     char mtext[1];
 102 };
 103
 104 asmlinkage long sys32_msgsnd(int msqid,
 105                                 struct msgbuf32 __user *umsgp32,
 106                                 size_t msgsz, int msgflg)
 107 {
 108         struct msgbuf *mb;
 109         struct msgbuf32 mb32;
 110         int err;
 111
 112         if ((mb = kmalloc(msgsz + sizeof *mb + 4, GFP_KERNEL)) == NULL)
 113                 return -ENOMEM;
 114
 115         err = get_user(mb32.mtype, &umsgp32->mtype);
 116         mb->mtype = mb32.mtype;
 117         err |= copy_from_user(mb->mtext, &umsgp32->mtext, msgsz);
 118
 119         if (err)
 120                 err = -EFAULT;
 121         else
 122                 KERNEL_SYSCALL(err, sys_msgsnd, msqid, (struct msgbuf __user *)mb, msgsz, msgflg);
 123
 124         kfree(mb);
 125         return err;
 126 }
 127
 128 asmlinkage long sys32_msgrcv(int msqid,
 129                                 struct msgbuf32 __user *umsgp32,
 130                                 size_t msgsz, long msgtyp, int msgflg)
 131 {
 132         struct msgbuf *mb;
 133         struct msgbuf32 mb32;
 134         int err, len;
 135
 136         if ((mb = kmalloc(msgsz + sizeof *mb + 4, GFP_KERNEL)) == NULL)
 137                 return -ENOMEM;
 138
 139         KERNEL_SYSCALL(err, sys_msgrcv, msqid, (struct msgbuf __user *)mb, msgsz, msgtyp, msgflg);
 140
 141         if (err >= 0) {
 142                 len = err;
 143                 mb32.mtype = mb->mtype;
 144                 err = put_user(mb32.mtype, &umsgp32->mtype);
 145                 err |= copy_to_user(&umsgp32->mtext, mb->mtext, len);
 146                 if (err)
 147                         err = -EFAULT;
 148                 else
 149                         err = len;
 150         }
 151
 152         kfree(mb);
 153         return err;
 154 }
 155
 156 asmlinkage int sys32_sendfile(int out_fd, int in_fd, compat_off_t __user *offset, s32 count)
 157 {
 158         mm_segment_t old_fs = get_fs();
 159         int ret;
 160         off_t of;
 161
 162         if (offset && get_user(of, offset))
 163                 return -EFAULT;
 164
 165         set_fs(KERNEL_DS);
 166         ret = sys_sendfile(out_fd, in_fd, offset ? (off_t __user *)&of : NULL, count);
 167         set_fs(old_fs);
 168
 169         if (offset && put_user(of, offset))
 170                 return -EFAULT;
 171
 172         return ret;
 173 }
 174
 175 asmlinkage int sys32_sendfile64(int out_fd, int in_fd, compat_loff_t __user *offset, s32 count)
 176 {
 177         mm_segment_t old_fs = get_fs();
 178         int ret;
 179         loff_t lof;
 180
 181         if (offset && get_user(lof, offset))
 182                 return -EFAULT;
 183
 184         set_fs(KERNEL_DS);
 185         ret = sys_sendfile64(out_fd, in_fd, offset ? (loff_t __user *)&lof : NULL, count);
 186         set_fs(old_fs);
 187
 188         if (offset && put_user(lof, offset))
 189                 return -EFAULT;
 190
 191         return ret;
 192 }
 193
 194
 195 /* lseek() needs a wrapper because 'offset' can be negative, but the top
 196  * half of the argument has been zeroed by syscall.S.
 197  */
 198
 199 asmlinkage int sys32_lseek(unsigned int fd, int offset, unsigned int origin)
 200 {
 201         return sys_lseek(fd, offset, origin);
 202 }
 203
 204 asmlinkage long sys32_semctl(int semid, int semnum, int cmd, union semun arg)
 205 {
 206         union semun u;
 207
 208         if (cmd == SETVAL) {
 209                 /* Ugh.  arg is a union of int,ptr,ptr,ptr, so is 8 bytes.
 210                  * The int should be in the first 4, but our argument
 211                  * frobbing has left it in the last 4.
 212                  */
 213                 u.val = *((int *)&arg + 1);
 214                 return sys_semctl (semid, semnum, cmd, u);
 215         }
 216         return sys_semctl (semid, semnum, cmd, arg);
 217 }
 218
 219 long sys32_lookup_dcookie(u32 cookie_high, u32 cookie_low, char __user *buf,
 220                           size_t len)
 221 {
 222         return sys_lookup_dcookie((u64)cookie_high << 32 | cookie_low,
 223                                   buf, len);
 224 }
 225
 226 asmlinkage long compat_sys_fallocate(int fd, int mode, u32 offhi, u32 offlo,
 227                                 u32 lenhi, u32 lenlo)
 228 {
 229         return sys_fallocate(fd, mode, ((loff_t)offhi << 32) | offlo,
 230                              ((loff_t)lenhi << 32) | lenlo);
 231 }