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/nfs_fs.h>
  30 #include <linux/ncp_fs.h>
  31 #include <linux/sunrpc/svc.h>
  32 #include <linux/nfsd/nfsd.h>
  33 #include <linux/nfsd/cache.h>
  34 #include <linux/nfsd/xdr.h>
  35 #include <linux/nfsd/syscall.h>
  36 #include <linux/poll.h>
  37 #include <linux/personality.h>
  38 #include <linux/stat.h>
  39 #include <linux/highmem.h>
  40 #include <linux/highuid.h>
  41 #include <linux/mman.h>
  42 #include <linux/binfmts.h>
  43 #include <linux/namei.h>
  44 #include <linux/vfs.h>
  45 #include <linux/ptrace.h>
  46 #include <linux/swap.h>
  47 #include <linux/syscalls.h>
  48
  49 #include <asm/types.h>
  50 #include <asm/uaccess.h>
  51 #include <asm/mmu_context.h>
  52
  53 #include "sys32.h"
  54
  55 #undef DEBUG
  56
  57 #ifdef DEBUG
  58 #define DBG(x)  printk x
  59 #else
  60 #define DBG(x)
  61 #endif
  62
  63 /*
  64  * sys32_execve() executes a new program.
  65  */
  66
  67 asmlinkage int sys32_execve(struct pt_regs *regs)
  68 {
  69         int error;
  70         char *filename;
  71
  72         DBG(("sys32_execve(%p) r26 = 0x%lx\n", regs, regs->gr[26]));
  73         filename = getname((const char __user *) regs->gr[26]);
  74         error = PTR_ERR(filename);
  75         if (IS_ERR(filename))
  76                 goto out;
  77         error = compat_do_execve(filename, compat_ptr(regs->gr[25]),
  78                                  compat_ptr(regs->gr[24]), regs);
  79         putname(filename);
  80 out:
  81
  82         return error;
  83 }
  84
  85 asmlinkage long sys32_unimplemented(int r26, int r25, int r24, int r23,
  86         int r22, int r21, int r20)
  87 {
  88     printk(KERN_ERR "%s(%d): Unimplemented 32 on 64 syscall #%d!\n",
  89         current->comm, current->pid, r20);
  90     return -ENOSYS;
  91 }
  92
  93 asmlinkage long sys32_sched_rr_get_interval(pid_t pid,
  94         struct compat_timespec __user *interval)
  95 {
  96         struct timespec t;
  97         int ret;
  98
  99         KERNEL_SYSCALL(ret, sys_sched_rr_get_interval, pid, (struct timespec __user *)&t);
 100         if (put_compat_timespec(&t, interval))
 101                 return -EFAULT;
 102         return ret;
 103 }
 104
 105 struct msgbuf32 {
 106     int mtype;
 107     char mtext[1];
 108 };
 109
 110 asmlinkage long sys32_msgsnd(int msqid,
 111                                 struct msgbuf32 __user *umsgp32,
 112                                 size_t msgsz, int msgflg)
 113 {
 114         struct msgbuf *mb;
 115         struct msgbuf32 mb32;
 116         int err;
 117
 118         if ((mb = kmalloc(msgsz + sizeof *mb + 4, GFP_KERNEL)) == NULL)
 119                 return -ENOMEM;
 120
 121         err = get_user(mb32.mtype, &umsgp32->mtype);
 122         mb->mtype = mb32.mtype;
 123         err |= copy_from_user(mb->mtext, &umsgp32->mtext, msgsz);
 124
 125         if (err)
 126                 err = -EFAULT;
 127         else
 128                 KERNEL_SYSCALL(err, sys_msgsnd, msqid, (struct msgbuf __user *)mb, msgsz, msgflg);
 129
 130         kfree(mb);
 131         return err;
 132 }
 133
 134 asmlinkage long sys32_msgrcv(int msqid,
 135                                 struct msgbuf32 __user *umsgp32,
 136                                 size_t msgsz, long msgtyp, int msgflg)
 137 {
 138         struct msgbuf *mb;
 139         struct msgbuf32 mb32;
 140         int err, len;
 141
 142         if ((mb = kmalloc(msgsz + sizeof *mb + 4, GFP_KERNEL)) == NULL)
 143                 return -ENOMEM;
 144
 145         KERNEL_SYSCALL(err, sys_msgrcv, msqid, (struct msgbuf __user *)mb, msgsz, msgtyp, msgflg);
 146
 147         if (err >= 0) {
 148                 len = err;
 149                 mb32.mtype = mb->mtype;
 150                 err = put_user(mb32.mtype, &umsgp32->mtype);
 151                 err |= copy_to_user(&umsgp32->mtext, mb->mtext, len);
 152                 if (err)
 153                         err = -EFAULT;
 154                 else
 155                         err = len;
 156         }
 157
 158         kfree(mb);
 159         return err;
 160 }
 161
 162 asmlinkage int sys32_sendfile(int out_fd, int in_fd, compat_off_t __user *offset, s32 count)
 163 {
 164         mm_segment_t old_fs = get_fs();
 165         int ret;
 166         off_t of;
 167
 168         if (offset && get_user(of, offset))
 169                 return -EFAULT;
 170
 171         set_fs(KERNEL_DS);
 172         ret = sys_sendfile(out_fd, in_fd, offset ? (off_t __user *)&of : NULL, count);
 173         set_fs(old_fs);
 174
 175         if (offset && put_user(of, offset))
 176                 return -EFAULT;
 177
 178         return ret;
 179 }
 180
 181 asmlinkage int sys32_sendfile64(int out_fd, int in_fd, compat_loff_t __user *offset, s32 count)
 182 {
 183         mm_segment_t old_fs = get_fs();
 184         int ret;
 185         loff_t lof;
 186
 187         if (offset && get_user(lof, offset))
 188                 return -EFAULT;
 189
 190         set_fs(KERNEL_DS);
 191         ret = sys_sendfile64(out_fd, in_fd, offset ? (loff_t __user *)&lof : NULL, count);
 192         set_fs(old_fs);
 193
 194         if (offset && put_user(lof, offset))
 195                 return -EFAULT;
 196
 197         return ret;
 198 }
 199
 200
 201 /* lseek() needs a wrapper because 'offset' can be negative, but the top
 202  * half of the argument has been zeroed by syscall.S.
 203  */
 204
 205 asmlinkage int sys32_lseek(unsigned int fd, int offset, unsigned int origin)
 206 {
 207         return sys_lseek(fd, offset, origin);
 208 }
 209
 210 asmlinkage long sys32_semctl(int semid, int semnum, int cmd, union semun arg)
 211 {
 212         union semun u;
 213
 214         if (cmd == SETVAL) {
 215                 /* Ugh.  arg is a union of int,ptr,ptr,ptr, so is 8 bytes.
 216                  * The int should be in the first 4, but our argument
 217                  * frobbing has left it in the last 4.
 218                  */
 219                 u.val = *((int *)&arg + 1);
 220                 return sys_semctl (semid, semnum, cmd, u);
 221         }
 222         return sys_semctl (semid, semnum, cmd, arg);
 223 }
 224
 225 long sys32_lookup_dcookie(u32 cookie_high, u32 cookie_low, char __user *buf,
 226                           size_t len)
 227 {
 228         return sys_lookup_dcookie((u64)cookie_high << 32 | cookie_low,
 229                                   buf, len);
 230 }
 231
 232 asmlinkage long compat_sys_fallocate(int fd, int mode, u32 offhi, u32 offlo,
 233                                 u32 lenhi, u32 lenlo)
 234 {
 235         return sys_fallocate(fd, mode, ((loff_t)offhi << 32) | offlo,
 236                              ((loff_t)lenhi << 32) | lenlo);
 237 }