sys_parisc32.c

linux-2.6.15.6

/*
 * 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/config.h>
#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/utsname.h>
#include <linux/time.h>
#include <linux/timex.h>
#include <linux/smp.h>
#include <linux/smp_lock.h>
#include <linux/sem.h>
#include <linux/msg.h>
#include <linux/shm.h>
#include <linux/slab.h>
#include <linux/uio.h>
#include <linux/nfs_fs.h>
#include <linux/ncp_fs.h>
#include <linux/sunrpc/svc.h>
#include <linux/nfsd/nfsd.h>
#include <linux/nfsd/cache.h>
#include <linux/nfsd/xdr.h>
#include <linux/nfsd/syscall.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/semaphore.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;
	char *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, compat_ptr(regs->gr[25]),
				 compat_ptr(regs->gr[24]), regs);
	if (error == 0) {
		task_lock(current);
		current->ptrace &= ~PT_DTRACE;
		task_unlock(current);
	}
	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;
}

#ifdef CONFIG_SYSCTL

struct __sysctl_args32 {
	u32 name;
	int nlen;
	u32 oldval;
	u32 oldlenp;
	u32 newval;
	u32 newlen;
	u32 __unused[4];
};

asmlinkage long sys32_sysctl(struct __sysctl_args32 __user *args)
{
	struct __sysctl_args32 tmp;
	int error;
	unsigned int oldlen32;
	size_t oldlen, *oldlenp = NULL;
	unsigned long addr = (((long __force)&args->__unused[0]) + 7) & ~7;
	extern int do_sysctl(int *name, int nlen, void *oldval, size_t *oldlenp,
	       void *newval, size_t newlen);

	DBG(("sysctl32(%p)\n", args));

	if (copy_from_user(&tmp, args, sizeof(tmp)))
		return -EFAULT;

	if (tmp.oldval && tmp.oldlenp) {
		/* Duh, this is ugly and might not work if sysctl_args
		   is in read-only memory, but do_sysctl does indirectly
		   a lot of uaccess in both directions and we'd have to
		   basically copy the whole sysctl.c here, and
		   glibc's __sysctl uses rw memory for the structure
		   anyway.  */
		/* a possibly better hack than this, which will avoid the
		 * problem if the struct is read only, is to push the
		 * 'oldlen' value out to the user's stack instead. -PB
		 */
		if (get_user(oldlen32, (u32 *)(u64)tmp.oldlenp))
			return -EFAULT;
		oldlen = oldlen32;
		if (put_user(oldlen, (size_t *)addr))
			return -EFAULT;
		oldlenp = (size_t *)addr;
	}

	lock_kernel();
	error = do_sysctl((int *)(u64)tmp.name, tmp.nlen, (void *)(u64)tmp.oldval,
			  oldlenp, (void *)(u64)tmp.newval, tmp.newlen);
	unlock_kernel();
	if (oldlenp) {
		if (!error) {
			if (get_user(oldlen, (size_t *)addr)) {
				error = -EFAULT;
			} else {
				oldlen32 = oldlen;
				if (put_user(oldlen32, (u32 *)(u64)tmp.oldlenp))
					error = -EFAULT;
			}
		}
		if (copy_to_user(&args->__unused[0], tmp.__unused, sizeof(tmp.__unused)))
			error = -EFAULT;
	}
	return error;
}

#endif /* CONFIG_SYSCTL */

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;
}

static int
put_compat_timeval(struct compat_timeval __user *u, struct timeval *t)
{
	struct compat_timeval t32;
	t32.tv_sec = t->tv_sec;
	t32.tv_usec = t->tv_usec;
	return copy_to_user(u, &t32, sizeof t32);
}

static inline long get_ts32(struct timespec *o, struct compat_timeval __user *i)
{
	long usec;

	if (__get_user(o->tv_sec, &i->tv_sec))
		return -EFAULT;
	if (__get_user(usec, &i->tv_usec))
		return -EFAULT;
	o->tv_nsec = usec * 1000;
	return 0;
}

asmlinkage int
sys32_gettimeofday(struct compat_timeval __user *tv, struct timezone __user *tz)
{
    extern void do_gettimeofday(struct timeval *tv);

    if (tv) {
	    struct timeval ktv;
	    do_gettimeofday(&ktv);
	    if (put_compat_timeval(tv, &ktv))
		    return -EFAULT;
    }
    if (tz) {
	    extern struct timezone sys_tz;
	    if (copy_to_user(tz, &sys_tz, sizeof(sys_tz)))
		    return -EFAULT;
    }
    return 0;
}

asmlinkage 
int sys32_settimeofday(struct compat_timeval __user *tv, struct timezone __user *tz)
{
	struct timespec kts;
	struct timezone ktz;

 	if (tv) {
		if (get_ts32(&kts, tv))
			return -EFAULT;
	}
	if (tz) {
		if (copy_from_user(&ktz, tz, sizeof(ktz)))
			return -EFAULT;
	}

	return do_sys_settimeofday(tv ? &kts : NULL, tz ? &ktz : NULL);
}

int cp_compat_stat(struct kstat *stat, struct compat_stat __user *statbuf)
{
	int err;

	if (stat->size > MAX_NON_LFS || !new_valid_dev(stat->dev) ||
	    !new_valid_dev(stat->rdev))
		return -EOVERFLOW;

	err  = put_user(new_encode_dev(stat->dev), &statbuf->st_dev);
	err |= put_user(stat->ino, &statbuf->st_ino);
	err |= put_user(stat->mode, &statbuf->st_mode);
	err |= put_user(stat->nlink, &statbuf->st_nlink);
	err |= put_user(0, &statbuf->st_reserved1);
	err |= put_user(0, &statbuf->st_reserved2);
	err |= put_user(new_encode_dev(stat->rdev), &statbuf->st_rdev);
	err |= put_user(stat->size, &statbuf->st_size);
	err |= put_user(stat->atime.tv_sec, &statbuf->st_atime);
	err |= put_user(stat->atime.tv_nsec, &statbuf->st_atime_nsec);
	err |= put_user(stat->mtime.tv_sec, &statbuf->st_mtime);
	err |= put_user(stat->mtime.tv_nsec, &statbuf->st_mtime_nsec);
	err |= put_user(stat->ctime.tv_sec, &statbuf->st_ctime);
	err |= put_user(stat->ctime.tv_nsec, &statbuf->st_ctime_nsec);
	err |= put_user(stat->blksize, &statbuf->st_blksize);
	err |= put_user(stat->blocks, &statbuf->st_blocks);
	err |= put_user(0, &statbuf->__unused1);
	err |= put_user(0, &statbuf->__unused2);
	err |= put_user(0, &statbuf->__unused3);
	err |= put_user(0, &statbuf->__unused4);
	err |= put_user(0, &statbuf->__unused5);
	err |= put_user(0, &statbuf->st_fstype); /* not avail */
	err |= put_user(0, &statbuf->st_realdev); /* not avail */
	err |= put_user(0, &statbuf->st_basemode); /* not avail */
	err |= put_user(0, &statbuf->st_spareshort);
	err |= put_user(stat->uid, &statbuf->st_uid);
	err |= put_user(stat->gid, &statbuf->st_gid);
	err |= put_user(0, &statbuf->st_spare4[0]);
	err |= put_user(0, &statbuf->st_spare4[1]);
	err |= put_user(0, &statbuf->st_spare4[2]);

	return err;
}

struct linux32_dirent {
	u32		d_ino;
	compat_off_t	d_off;
	u16		d_reclen;
	char		d_name[1];
};

struct old_linux32_dirent {
	u32	d_ino;
	u32	d_offset;
	u16	d_namlen;
	char	d_name[1];
};

struct getdents32_callback {
	struct linux32_dirent __user * current_dir;
	struct linux32_dirent __user * previous;
	int count;
	int error;
};

struct readdir32_callback {
	struct old_linux32_dirent __user * dirent;
	int count;
};

#define ROUND_UP(x,a)	((__typeof__(x))(((unsigned long)(x) + ((a) - 1)) & ~((a) - 1)))
#define NAME_OFFSET(de) ((int) ((de)->d_name - (char __user *) (de)))
static int
filldir32 (void *__buf, const char *name, int namlen, loff_t offset, ino_t ino,
	   unsigned int d_type)
{
	struct linux32_dirent __user * dirent;
	struct getdents32_callback * buf = (struct getdents32_callback *) __buf;
	int reclen = ROUND_UP(NAME_OFFSET(dirent) + namlen + 1, 4);

	buf->error = -EINVAL;	/* only used if we fail.. */
	if (reclen > buf->count)
		return -EINVAL;
	dirent = buf->previous;
	if (dirent)
		put_user(offset, &dirent->d_off);
	dirent = buf->current_dir;
	buf->previous = dirent;
	put_user(ino, &dirent->d_ino);
	put_user(reclen, &dirent->d_reclen);
	copy_to_user(dirent->d_name, name, namlen);
	put_user(0, dirent->d_name + namlen);
	dirent = ((void __user *)dirent) + reclen;
	buf->current_dir = dirent;
	buf->count -= reclen;
	return 0;
}

asmlinkage long
sys32_getdents (unsigned int fd, void __user * dirent, unsigned int count)
{
	struct file * file;
	struct linux32_dirent __user * lastdirent;
	struct getdents32_callback buf;
	int error;

	error = -EBADF;
	file = fget(fd);
	if (!file)
		goto out;

	buf.current_dir = (struct linux32_dirent __user *) dirent;
	buf.previous = NULL;
	buf.count = count;
	buf.error = 0;

	error = vfs_readdir(file, filldir32, &buf);
	if (error < 0)
		goto out_putf;
	error = buf.error;
	lastdirent = buf.previous;
	if (lastdirent) {
		put_user(file->f_pos, &lastdirent->d_off);
		error = count - buf.count;