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