/*
* linux/arch/alpha/kernel/osf_sys.c
*
* Copyright (C) 1995 Linus Torvalds
*/
/*
* This file handles some of the stranger OSF/1 system call interfaces.
* Some of the system calls expect a non-C calling standard, others have
* special parameter blocks..
*/
#include <linux/errno.h>
#include <linux/sched.h>
#include <linux/kernel.h>
#include <linux/mm.h>
#include <linux/stddef.h>
#include <linux/unistd.h>
#include <linux/ptrace.h>
#include <linux/malloc.h>
#include <linux/ldt.h>
#include <linux/user.h>
#include <linux/a.out.h>
#include <linux/utsname.h>
#include <linux/time.h>
#include <linux/major.h>
#include <linux/stat.h>
#include <linux/mman.h>
#include <linux/shm.h>
#include <asm/fpu.h>
#include <asm/io.h>
#include <asm/segment.h>
#include <asm/system.h>
extern int do_mount(kdev_t, const char *, const char *, char *, int, void *);
extern int do_pipe(int *);
extern struct file_operations * get_blkfops(unsigned int);
extern struct file_operations * get_chrfops(unsigned int);
extern kdev_t get_unnamed_dev(void);
extern void put_unnamed_dev(kdev_t);
extern asmlinkage int sys_umount(char *);
extern asmlinkage int sys_swapon(const char *specialfile, int swap_flags);
/*
* OSF/1 directory handling functions...
*
* The "getdents()" interface is much more sane: the "basep" stuff is
* braindamage (it can't really handle filesystems where the directory
* offset differences aren't the same as "d_reclen").
*/
#define NAME_OFFSET(de) ((int) ((de)->d_name - (char *) (de)))
#define ROUND_UP(x) (((x)+3) & ~3)
struct osf_dirent {
unsigned int d_ino;
unsigned short d_reclen;
unsigned short d_namlen;
char d_name[1];
};
struct osf_dirent_callback {
struct osf_dirent * dirent;
long *basep;
int count;
int error;
};
static int osf_filldir(void * __buf, const char * name, int namlen, off_t offset, ino_t ino)
{
struct osf_dirent * dirent;
struct osf_dirent_callback * buf = (struct osf_dirent_callback *) __buf;
int reclen = ROUND_UP(NAME_OFFSET(dirent) + namlen + 1);
buf->error = -EINVAL; /* only used if we fail */
if (reclen > buf->count)
return -EINVAL;
if (buf->basep) {
put_user(offset, buf->basep);
buf->basep = NULL;
}
dirent = buf->dirent;
put_user(ino, &dirent->d_ino);
put_user(namlen, &dirent->d_namlen);
put_user(reclen, &dirent->d_reclen);
memcpy_tofs(dirent->d_name, name, namlen);
put_fs_byte(0, dirent->d_name + namlen);
((char *) dirent) += reclen;
buf->dirent = dirent;
buf->count -= reclen;
return 0;
}
asmlinkage int osf_getdirentries(unsigned int fd, struct osf_dirent * dirent,
unsigned int count, long *basep)
{
int error;
struct file * file;
struct osf_dirent_callback buf;
if (fd >= NR_OPEN || !(file = current->files->fd[fd]))
return -EBADF;
if (!file->f_op || !file->f_op->readdir)
return -ENOTDIR;
error = verify_area(VERIFY_WRITE, dirent, count);
if (error)
return error;
if (basep) {
error = verify_area(VERIFY_WRITE, basep, sizeof(long));
if (error)
return error;
}
buf.dirent = dirent;
buf.basep = basep;
buf.count = count;
buf.error = 0;
error = file->f_op->readdir(file->f_inode, file, &buf, osf_filldir);
if (error < 0)
return error;
if (count == buf.count)
return buf.error;
return count - buf.count;
}
/*
* Alpha syscall convention has no problem returning negative
* values:
*/
asmlinkage int osf_getpriority(int which, int who, int a2, int a3, int a4,
int a5, struct pt_regs regs)
{
extern int sys_getpriority(int, int);
int prio;
prio = sys_getpriority(which, who);
if (prio < 0)
return prio;
regs.r0 = 0; /* special return: no errors */
return 20 - prio;
}
/*
* Heh. As documented by DEC..
*/
asmlinkage unsigned long sys_madvise(void)
{
return 0;
}
asmlinkage unsigned long sys_getxuid(int a0, int a1, int a2, int a3, int a4, int a5,
struct pt_regs regs)
{
(®s)->r20 = current->euid;
return current->uid;
}
asmlinkage unsigned long sys_getxgid(int a0, int a1, int a2, int a3, int a4, int a5,
struct pt_regs regs)
{
(®s)->r20 = current->egid;
return current->gid;
}
asmlinkage unsigned long sys_getxpid(int a0, int a1, int a2, int a3, int a4, int a5,
struct pt_regs regs)
{
(®s)->r20 = current->p_opptr->pid;
return current->pid;
}
asmlinkage unsigned long osf_mmap(unsigned long addr, unsigned long len,
unsigned long prot, unsigned long flags, unsigned long fd,
unsigned long off)
{
struct file * file = NULL;
if (flags & (MAP_HASSEMAPHORE | MAP_INHERIT | MAP_UNALIGNED))
printk("%s: unimplemented OSF mmap flags %04lx\n", current->comm, flags);
if (!(flags & MAP_ANONYMOUS)) {
if (fd >= NR_OPEN || !(file = current->files->fd[fd]))
return -EBADF;
}
flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE);
return do_mmap(file, addr, len, prot, flags, off);
}
/*
* The OSF/1 statfs structure is much larger, but this should
* match the beginning, at least.
*/
struct osf_statfs {
short f_type;
short f_flags;
int f_fsize;
int f_bsize;
int f_blocks;
int f_bfree;
int f_bavail;
int f_files;
int f_ffree;
__kernel_fsid_t f_fsid;
} * osf_stat;
static void linux_to_osf_statfs (struct statfs * linux_stat, struct osf_statfs * osf_stat)
{
osf_stat->f_type = linux_stat->f_type;
osf_stat->f_flags = 0; /* mount flags */
/* Linux doesn't provide a "fundamental filesystem block size": */
osf_stat->f_fsize = linux_stat->f_bsize;
osf_stat->f_bsize = linux_stat->f_bsize;
osf_stat->f_blocks = linux_stat->f_blocks;
osf_stat->f_bfree = linux_stat->f_bfree;
osf_stat->f_bavail = linux_stat->f_bavail;
osf_stat->f_files = linux_stat->f_files;
osf_stat->f_ffree = linux_stat->f_ffree;
osf_stat->f_fsid = linux_stat->f_fsid;
}
asmlinkage int osf_statfs(char * path, struct osf_statfs * buffer, unsigned long bufsiz)
{
struct statfs linux_stat;
struct inode * inode;
int retval;
if (bufsiz > sizeof(struct osf_statfs))
bufsiz = sizeof(struct osf_statfs);
retval = verify_area(VERIFY_WRITE, buffer, bufsiz);
if (retval)
return retval;
retval = namei(path, &inode);
if (retval)
return retval;
if (!inode->i_sb->s_op->statfs) {
iput(inode);
return -ENOSYS;
}
inode->i_sb->s_op->statfs(inode->i_sb, &linux_stat, sizeof(linux_stat));
linux_to_osf_statfs(&linux_stat, buffer);
iput(inode);
return 0;
}
asmlinkage int osf_fstatfs(unsigned long fd, struct osf_statfs * buffer, unsigned long bufsiz)
{
struct statfs linux_stat;
struct file * file;
struct inode * inode;
int retval;
retval = verify_area(VERIFY_WRITE, buffer, bufsiz);
if (retval)
return retval;
if (bufsiz > sizeof(struct osf_statfs))
bufsiz = sizeof(struct osf_statfs);
if (fd >= NR_OPEN || !(file = current->files->fd[fd]))
return -EBADF;
if (!(inode = file->f_inode))
return -ENOENT;
if (!inode->i_sb->s_op->statfs)
return -ENOSYS;
inode->i_sb->s_op->statfs(inode->i_sb, &linux_stat, sizeof(linux_stat));
linux_to_osf_statfs(&linux_stat, buffer);
return 0;
}
/*
* Uhh.. OSF/1 mount parameters aren't exactly obvious..
*
* Although to be frank, neither are the native Linux/i386 ones..
*/
struct ufs_args {
char * devname;
int flags;
uid_t exroot;
};
struct cdfs_args {
char * devname;
int flags;
uid_t exroot;
/*
* this has lots more here, which linux handles with the option block
* but I'm too lazy to do the translation into ascii..
*/
};
struct procfs_args {
char * devname;
int flags;
uid_t exroot;
};
static int getdev(const char * name, int rdonly, struct inode ** ino)
{
kdev_t dev;
struct inode * inode;
struct file_operations * fops;
int retval;
retval = namei(name, &inode);
if (retval)
return retval;
if (!S_ISBLK(inode->i_mode)) {
iput(inode);
return -ENOTBLK;
}
if (IS_NODEV(inode)) {
iput(inode);
return -EACCES;
}
dev = inode->i_rdev;
if (MAJOR(dev) >= MAX_BLKDEV) {
iput(inode);
return -ENXIO;
}
fops = get_blkfops(MAJOR(dev));
if (!fops) {
iput(inode);
return -ENODEV;
}
if (fops->open) {
struct file dummy;
memset(&dummy, 0, sizeof(dummy));
dummy.f_inode = inode;
dummy.f_mode = rdonly ? 1 : 3;
retval = fops->open(inode, &dummy);
if (retval) {
iput(inode);
return retval;
}
}
*ino = inode;
return 0;
}
static void putdev(struct inode * inode)
{
struct file_operations * fops;
fops = get_blkfops(MAJOR(inode->i_rdev));
if (fops->release)
fops->release(inode, NULL);
}
/*
* We can't actually handle ufs yet, so we translate UFS mounts to
* ext2fs mounts... I wouldn't mind a UFS filesystem, but the UFS
* layout is so braindead it's a major headache doing it..
*/
static int osf_ufs_mount(char * dirname, struct ufs_args * args, int flags)
{
int retval;
struct inode * inode;
struct cdfs_args tmp;
retval = verify_area(VERIFY_READ, args, sizeof(*args));
if (retval)
return retval;
memcpy_fromfs(&tmp, args, sizeof(tmp));
retval = getdev(tmp.devname, 0, &inode);
if (retval)
return retval;
retval = do_mount(inode->i_rdev, tmp.devname, dirname, "ext2", flags, NULL);
if (retval)
putdev(inode);
iput(inode);
return retval;
}
static int osf_cdfs_mount(char * dirname, struct cdfs_args * args, int flags)
{
int retval;
struct inode * inode;
struct cdfs_args tmp;
retval = verify_area(VERIFY_READ, args, sizeof(*args));
if (retval)
return retval;
memcpy_fromfs(&tmp, args, sizeof(tmp));
retval = getdev(tmp.devname, 1, &inode);
if (retval)
return retval;
retval = do_mount(inode->i_rdev, tmp.devname, dirname, "iso9660", flags, NULL);
if (retval)
putdev(inode);
iput(inode);
return retval;
}
static int osf_procfs_mount(char * dirname, struct procfs_args * args, int flags)
{
kdev_t dev;
int retval;
struct procfs_args tmp;
retval = verify_area(VERIFY_READ, args, sizeof(*args));
if (retval)
return retval;
memcpy_fromfs(&tmp, args, sizeof(tmp));
dev = get_unnamed_dev();
if (!dev)
return -ENODEV;
retval = do_mount(dev, "", dirname, "proc", flags, NULL);
if (retval)
put_unnamed_dev(dev);
return retval;
}
asmlinkage int osf_mount(unsigned long typenr, char * path, int flag, void * data)
{
int retval;
retval = -EINVAL;
switch (typenr) {
case 1:
retval = osf_ufs_mount(path, (struct ufs_args *) data, flag);
break;
case 6:
retval = osf_cdfs_mount(path, (struct cdfs_args *) data, flag);
break;
case 9:
retval = osf_procfs_mount(path, (struct procfs_args *) data, flag);
break;
default:
printk("osf_mount(%ld, %x)\n", typenr, flag);
}
return retval;
}
asmlinkage int osf_umount(char * path, int flag)
{
return sys_umount(path);
}
/*
* I don't know what the parameters are: the first one
* seems to be a timeval pointer, and I suspect the second
* one is the time remaining.. Ho humm.. No documentation.
*/
asmlinkage int osf_usleep_thread(struct timeval * sleep, struct timeval * remain)
{
struct timeval tmp;
unsigned long ticks;
int retval;
retval = verify_area(VERIFY_READ, sleep, sizeof(*sleep));
if (retval)
return retval;
if (remain && (retval = verify_area(VERIFY_WRITE, remain, sizeof(*remain))))
return retval;
memcpy_fromfs(&tmp, sleep, sizeof(*sleep));
ticks = tmp.tv_usec;
ticks = (ticks + (1000000 / HZ) - 1) / (1000000 / HZ);
ticks += tmp.tv_sec * HZ;
current->timeout = ticks + jiffies;
current->state = TASK_INTERRUPTIBLE;
schedule();
if (!remain)
return 0;
ticks = jiffies;
if (ticks < current->timeout)
ticks = current->timeout - ticks;
else
ticks = 0;
current->timeout = 0;
tmp.tv_sec = ticks / HZ;
tmp.tv_usec = ticks % HZ;
memcpy_tofs(remain, &tmp, sizeof(*remain));
return 0;
}
asmlinkage int osf_utsname(char * name)
{
int error = verify_area(VERIFY_WRITE, name, 5*32);
if (error)
return error;
memcpy_tofs(name + 0, system_utsname.sysname, 32);
memcpy_tofs(name + 32, system_utsname.nodename, 32);
memcpy_tofs(name + 64, system_utsname.release, 32);
memcpy_tofs(name + 96, system_utsname.version, 32);
memcpy_tofs(name + 128, system_utsname.machine, 32);
return 0;
}
asmlinkage int osf_swapon(const char * path, int flags, int lowat, int hiwat)
{
/* for now, simply ignore lowat and hiwat... */
return sys_swapon(path, flags);
}
asmlinkage unsigned long sys_getpagesize(void)
{
return PAGE_SIZE;
}
asmlinkage unsigned long sys_getdtablesize(void)
{
return NR_OPEN;
}
asmlinkage int sys_pipe(int a0, int a1, int a2, int a3, int a4, int a5,
struct pt_regs regs)
{
int fd[2];
int error;
error = do_pipe(fd);
if (error)
return error;
(®s)->r20 = fd[1];
return fd[0];
}
/*
* For compatibility with OSF/1 only. Use utsname(2) instead.
*/
asmlinkage int osf_getdomainname(char *name, int namelen)
{
unsigned len;
int i, error;
error = verify_area(VERIFY_WRITE, name, namelen);
if (error)
return error;
len = namelen;
if (namelen > 32)
len = 32;
for (i = 0; i < len; ++i) {
put_user(system_utsname.domainname[i], name + i);
if (system_utsname.domainname[i] == '\0')
break;
}
return 0;
}
asmlinkage long osf_shmat(int shmid, void *shmaddr, int shmflg)
{
unsigned long raddr;
int err;
err = sys_shmat(shmid, shmaddr, shmflg, &raddr);
if (err)
return err;
/*
* This works because all user-level addresses are
* non-negative longs!
*/
return raddr;
}
/*
* The following stuff should move into a header file should it ever
* be labeled "officially supported." Right now, there is just enough
* support to avoid applications (such as tar) printing error
* messages. The attributes are not really implemented.
*/
/*
* Values for Property list entry flag
*/
#define PLE_PROPAGATE_ON_COPY 0x1 /* cp(1) will copy entry
by default */
#define PLE_FLAG_MASK 0x1 /* Valid flag values */
#define PLE_FLAG_ALL -1 /* All flag value */
struct proplistname_args {
unsigned int pl_mask;
unsigned int pl_numnames;
char **pl_names;
};
union pl_args {
struct setargs {
char *path;
long follow;
long nbytes;
char *buf;
} set;
struct fsetargs {
long fd;
long nbytes;
char *buf;
} fset;
struct getargs {
char *path;
long follow;
struct proplistname_args *name_args;
long nbytes;
char *buf;
int *min_buf_size;
} get;
struct fgetargs {
long fd;
struct proplistname_args *name_args;
long nbytes;
char *buf;
int *min_buf_size;
} fget;
struct delargs {
char *path;
long follow;
struct proplistname_args *name_args;
} del;
struct fdelargs {
long fd;
struct proplistname_args *name_args;
} fdel;
};
enum pl_code {
PL_SET = 1, PL_FSET = 2,
PL_GET = 3, PL_FGET = 4,
PL_DEL = 5, PL_FDEL = 6
};
asmlinkage long osf_proplist_syscall (enum pl_code code, union pl_args *args)
{
long error;
int *min_buf_size_ptr;
switch (code) {
case PL_SET:
error = verify_area(VERIFY_READ, &args->set.nbytes,
sizeof(args->set.nbytes));
if (error)
return error;
return args->set.nbytes;
case PL_FSET:
error = verify_area(VERIFY_READ, &args->fset.nbytes,
sizeof(args->fset.nbytes));
if (error)
return error;
return args->fset.nbytes;
case PL_GET:
error = verify_area(VERIFY_READ, &args->get.min_buf_size,
sizeof(args->get.min_buf_size));
if (error)
return error;
min_buf_size_ptr = get_user(&args->get.min_buf_size);
error = verify_area(VERIFY_WRITE, min_buf_size_ptr,
sizeof(*min_buf_size_ptr));
if (error)
return error;
put_user(0, min_buf_size_ptr);
return 0;
case PL_FGET:
error = verify_area(VERIFY_READ, &args->fget.min_buf_size,
sizeof(args->fget.min_buf_size));
if (error)
return error;
min_buf_size_ptr = get_user(&args->fget.min_buf_size);
error = verify_area(VERIFY_WRITE, min_buf_size_ptr,
sizeof(*min_buf_size_ptr));
if (error)
return error;
put_user(0, min_buf_size_ptr);
return 0;
case PL_DEL:
case PL_FDEL:
return 0;
default:
return -EOPNOTSUPP;
}
}
/*
* The Linux kernel isn't good at returning values that look
* like negative longs (they are mistaken as error values).
* Until that is fixed, we need this little workaround for
* create_module() because it's one of the few system calls
* that return kernel addresses (which are negative).
*/
asmlinkage unsigned long
alpha_create_module (char * module_name, unsigned long size,
int a3, int a4, int a5, int a6,
struct pt_regs regs)
{
asmlinkage unsigned long sys_create_module (char *, unsigned long);
long retval;
retval = sys_create_module(module_name, size);
/*
* we get either a module address or an error number,
* and we know the error number is a small negative
* number, while the address is always negative but
* much larger.
*/
if (retval + 1000 > 0)
return retval;
/* tell entry.S:syscall_error that this is NOT an error: */
regs.r0 = 0;
return retval;
}
asmlinkage unsigned long
osf_getsysinfo (unsigned long op, void * buffer, unsigned long nbytes,
int * start, void *arg)
{
switch (op) {
case 45: /* GSI_IEEE_FP_CONTROL */
/* Return current sw control & status bits. */
put_user(current->tss.flags & IEEE_SW_MASK,
(unsigned long *)buffer);
return 0;
case 46: /* GSI_IEEE_STATE_AT_SIGNAL */
/*
* Not sure anybody will ever use this weird stuff. These
* ops can be used (under OSF/1) to set the fpcr that should
* be used when a signal handler starts executing.
*/
break;
default:
break;
}
return -EOPNOTSUPP;
}
asmlinkage unsigned long
osf_setsysinfo (unsigned long op, void * buffer, unsigned long nbytes,
int * start, void *arg)
{
switch (op) {
case 14: { /* SSI_IEEE_FP_CONTROL */
unsigned long sw, fpcw;
/*
* Alpha Architecture Handbook 4.7.7.3:
* To be fully IEEE compiant, we must track the current IEEE
* exception state in software, because spurrious bits can be
* set in the trap shadow of a software-complete insn.
*/
/* Update software trap enable bits. */
sw = get_user((unsigned long *) buffer) & IEEE_SW_MASK;
current->tss.flags &= ~IEEE_SW_MASK;
current->tss.flags |= sw & IEEE_SW_MASK;
/* Update the real fpcr. For exceptions that are disabled,
but that we have seen, turn off exceptions in h/w.
Otherwise leave them enabled so that we can update our
software status mask. */
fpcw = rdfpcr() & (~FPCR_MASK | FPCR_DYN_MASK);
fpcw |= ieee_sw_to_fpcr(sw | ((~sw & IEEE_STATUS_MASK) >> 16));
wrfpcr(fpcw);
return 0;
}
case 15: /* SSI_IEEE_STATE_AT_SIGNAL */
case 16: /* SSI_IEEE_IGNORE_STATE_AT_SIGNAL */
/*
* Not sure anybody will ever use this weird stuff. These
* ops can be used (under OSF/1) to set the fpcr that should
* be used when a signal handler starts executing.
*/
break;
default:
break;
}
return -EOPNOTSUPP;
}
