sys_parisc32.c

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/*
 * sys_parisc32.c: Conversion between 32bit and 64bit native syscalls.
 *
 * Copyright (C) 2000-2001 Hewlett Packard Company
 * Copyright (C) 2000 John Marvin
 * Copyright (C) 2001 Matthew Wilcox
 *
 * These routines maintain argument size conversion between 32bit and 64bit
 * environment. Based heavily on sys_ia32.c and sys_sparc32.c.
 */

#include <linux/compat.h>
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/fs.h> 
#include <linux/mm.h> 
#include <linux/file.h> 
#include <linux/signal.h>
#include <linux/resource.h>
#include <linux/times.h>
#include <linux/time.h>
#include <linux/smp.h>
#include <linux/sem.h>
#include <linux/msg.h>
#include <linux/shm.h>
#include <linux/slab.h>
#include <linux/uio.h>
#include <linux/ncp_fs.h>
#include <linux/poll.h>
#include <linux/personality.h>
#include <linux/stat.h>
#include <linux/highmem.h>
#include <linux/highuid.h>
#include <linux/mman.h>
#include <linux/binfmts.h>
#include <linux/namei.h>
#include <linux/vfs.h>
#include <linux/ptrace.h>
#include <linux/swap.h>
#include <linux/syscalls.h>

#include <asm/types.h>
#include <asm/uaccess.h>
#include <asm/mmu_context.h>

#include "sys32.h"

#undef DEBUG

#ifdef DEBUG
#define DBG(x)  printk x
#else
#define DBG(x)
#endif

/*
 * sys32_execve() executes a new program.
 */

asmlinkage int sys32_execve(struct pt_regs *regs)
{
    int error;
    struct filename *filename;

    DBG(("sys32_execve(%p) r26 = 0x%lx\n", regs, regs->gr[26]));
    filename = getname((const char __user *) regs->gr[26]);
    error = PTR_ERR(filename);
    if (IS_ERR(filename))
        goto out;
    error = compat_do_execve(filename->name, compat_ptr(regs->gr[25]),
                 compat_ptr(regs->gr[24]), regs);
    putname(filename);
out:

    return error;
}

asmlinkage long sys32_unimplemented(int r26, int r25, int r24, int r23,
    int r22, int r21, int r20)
{
    printk(KERN_ERR "%s(%d): Unimplemented 32 on 64 syscall #%d!\n", 
        current->comm, current->pid, r20);
    return -ENOSYS;
}

asmlinkage long sys32_sched_rr_get_interval(pid_t pid,
    struct compat_timespec __user *interval)
{
    struct timespec t;
    int ret;

    KERNEL_SYSCALL(ret, sys_sched_rr_get_interval, pid, (struct timespec __user *)&t);
    if (put_compat_timespec(&t, interval))
        return -EFAULT;
    return ret;
}

struct msgbuf32 {
    int mtype;
    char mtext[1];
};

asmlinkage long sys32_msgsnd(int msqid,
                struct msgbuf32 __user *umsgp32,
                size_t msgsz, int msgflg)
{
    struct msgbuf *mb;
    struct msgbuf32 mb32;
    int err;

    if ((mb = kmalloc(msgsz + sizeof *mb + 4, GFP_KERNEL)) == NULL)
        return -ENOMEM;

    err = get_user(mb32.mtype, &umsgp32->mtype);
    mb->mtype = mb32.mtype;
    err |= copy_from_user(mb->mtext, &umsgp32->mtext, msgsz);

    if (err)
        err = -EFAULT;
    else
        KERNEL_SYSCALL(err, sys_msgsnd, msqid, (struct msgbuf __user *)mb, msgsz, msgflg);

    kfree(mb);
    return err;
}

asmlinkage long sys32_msgrcv(int msqid,
                struct msgbuf32 __user *umsgp32,
                size_t msgsz, long msgtyp, int msgflg)
{
    struct msgbuf *mb;
    struct msgbuf32 mb32;
    int err, len;

    if ((mb = kmalloc(msgsz + sizeof *mb + 4, GFP_KERNEL)) == NULL)
        return -ENOMEM;

    KERNEL_SYSCALL(err, sys_msgrcv, msqid, (struct msgbuf __user *)mb, msgsz, msgtyp, msgflg);

    if (err >= 0) {
        len = err;
        mb32.mtype = mb->mtype;
        err = put_user(mb32.mtype, &umsgp32->mtype);
        err |= copy_to_user(&umsgp32->mtext, mb->mtext, len);
        if (err)
            err = -EFAULT;
        else
            err = len;
    }

    kfree(mb);
    return err;
}

asmlinkage int sys32_sendfile(int out_fd, int in_fd, compat_off_t __user *offset, s32 count)
{
        mm_segment_t old_fs = get_fs();
        int ret;
        off_t of;

        if (offset && get_user(of, offset))
                return -EFAULT;

        set_fs(KERNEL_DS);
        ret = sys_sendfile(out_fd, in_fd, offset ? (off_t __user *)&of : NULL, count);
        set_fs(old_fs);

        if (offset && put_user(of, offset))
                return -EFAULT;

        return ret;
}

asmlinkage int sys32_sendfile64(int out_fd, int in_fd, compat_loff_t __user *offset, s32 count)
{
    mm_segment_t old_fs = get_fs();
    int ret;
    loff_t lof;
    
    if (offset && get_user(lof, offset))
        return -EFAULT;
        
    set_fs(KERNEL_DS);
    ret = sys_sendfile64(out_fd, in_fd, offset ? (loff_t __user *)&lof : NULL, count);
    set_fs(old_fs);
    
    if (offset && put_user(lof, offset))
        return -EFAULT;
        
    return ret;
}


/* lseek() needs a wrapper because 'offset' can be negative, but the top
 * half of the argument has been zeroed by syscall.S.
 */

asmlinkage int sys32_lseek(unsigned int fd, int offset, unsigned int origin)
{
    return sys_lseek(fd, offset, origin);
}

asmlinkage long sys32_semctl(int semid, int semnum, int cmd, union semun arg)
{
        union semun u;
    
        if (cmd == SETVAL) {
                /* Ugh.  arg is a union of int,ptr,ptr,ptr, so is 8 bytes.
                 * The int should be in the first 4, but our argument
                 * frobbing has left it in the last 4.
                 */
                u.val = *((int *)&arg + 1);
                return sys_semctl (semid, semnum, cmd, u);
    }
    return sys_semctl (semid, semnum, cmd, arg);
}

long sys32_lookup_dcookie(u32 cookie_high, u32 cookie_low, char __user *buf,
              size_t len)
{
    return sys_lookup_dcookie((u64)cookie_high << 32 | cookie_low,
                  buf, len);
}

asmlinkage long compat_sys_fallocate(int fd, int mode, u32 offhi, u32 offlo,
                u32 lenhi, u32 lenlo)
{
        return sys_fallocate(fd, mode, ((loff_t)offhi << 32) | offlo,
                             ((loff_t)lenhi << 32) | lenlo);
}

asmlinkage long compat_sys_fanotify_mark(int fan_fd, int flags, u32 mask_hi,
                     u32 mask_lo, int fd,
                     const char __user *pathname)
{
    return sys_fanotify_mark(fan_fd, flags, ((u64)mask_hi << 32) | mask_lo,
                 fd, pathname);
}