sys_sparc32.c

Linux内核源代码 为压缩文件 是<<Linux内核>>一书中的源代码

		switch (_NSIG_WORDS) {
		case 4: s32.sig[7] = (s.sig[3] >> 32); s32.sig[6] = s.sig[3];
		case 3: s32.sig[5] = (s.sig[2] >> 32); s32.sig[4] = s.sig[2];
		case 2: s32.sig[3] = (s.sig[1] >> 32); s32.sig[2] = s.sig[1];
		case 1: s32.sig[1] = (s.sig[0] >> 32); s32.sig[0] = s.sig[0];
		}
		if (copy_to_user (set, &s32, sizeof(sigset_t32)))
			return -EFAULT;
	}
	return ret;
}

asmlinkage int
sys32_rt_sigtimedwait(sigset_t32 *uthese, siginfo_t32 *uinfo,
		      struct timespec32 *uts, __kernel_size_t32 sigsetsize)
{
	int ret, sig;
	sigset_t these;
	sigset_t32 these32;
	struct timespec ts;
	siginfo_t info;
	long timeout = 0;

	/* XXX: Don't preclude handling different sized sigset_t's.  */
	if (sigsetsize != sizeof(sigset_t))
		return -EINVAL;

	if (copy_from_user (&these32, uthese, sizeof(sigset_t32)))
		return -EFAULT;

	switch (_NSIG_WORDS) {
	case 4: these.sig[3] = these32.sig[6] | (((long)these32.sig[7]) << 32);
	case 3: these.sig[2] = these32.sig[4] | (((long)these32.sig[5]) << 32);
	case 2: these.sig[1] = these32.sig[2] | (((long)these32.sig[3]) << 32);
	case 1: these.sig[0] = these32.sig[0] | (((long)these32.sig[1]) << 32);
	}
		
	/*
	 * Invert the set of allowed signals to get those we
	 * want to block.
	 */
	sigdelsetmask(&these, sigmask(SIGKILL)|sigmask(SIGSTOP));
	signotset(&these);

	if (uts) {
		if (get_user (ts.tv_sec, &uts->tv_sec) ||
		    get_user (ts.tv_nsec, &uts->tv_nsec))
			return -EINVAL;
		if (ts.tv_nsec >= 1000000000L || ts.tv_nsec < 0
		    || ts.tv_sec < 0)
			return -EINVAL;
	}

	spin_lock_irq(&current->sigmask_lock);
	sig = dequeue_signal(&these, &info);
	if (!sig) {
		/* None ready -- temporarily unblock those we're interested
		   in so that we'll be awakened when they arrive.  */
		sigset_t oldblocked = current->blocked;
		sigandsets(&current->blocked, &current->blocked, &these);
		recalc_sigpending(current);
		spin_unlock_irq(&current->sigmask_lock);

		timeout = MAX_SCHEDULE_TIMEOUT;
		if (uts)
			timeout = (timespec_to_jiffies(&ts)
				   + (ts.tv_sec || ts.tv_nsec));

		current->state = TASK_INTERRUPTIBLE;
		timeout = schedule_timeout(timeout);

		spin_lock_irq(&current->sigmask_lock);
		sig = dequeue_signal(&these, &info);
		current->blocked = oldblocked;
		recalc_sigpending(current);
	}
	spin_unlock_irq(&current->sigmask_lock);

	if (sig) {
		ret = sig;
		if (uinfo) {
			if (copy_siginfo_to_user32(uinfo, &info))
				ret = -EFAULT;
		}
	} else {
		ret = -EAGAIN;
		if (timeout)
			ret = -EINTR;
	}

	return ret;
}

extern asmlinkage int
sys_rt_sigqueueinfo(int pid, int sig, siginfo_t *uinfo);

asmlinkage int
sys32_rt_sigqueueinfo(int pid, int sig, siginfo_t32 *uinfo)
{
	siginfo_t info;
	int ret;
	mm_segment_t old_fs = get_fs();
	
	if (copy_from_user (&info, uinfo, 3*sizeof(int)) ||
	    copy_from_user (info._sifields._pad, uinfo->_sifields._pad, SI_PAD_SIZE))
		return -EFAULT;
	set_fs (KERNEL_DS);
	ret = sys_rt_sigqueueinfo(pid, sig, &info);
	set_fs (old_fs);
	return ret;
}

struct tms32 {
	__kernel_clock_t32 tms_utime;
	__kernel_clock_t32 tms_stime;
	__kernel_clock_t32 tms_cutime;
	__kernel_clock_t32 tms_cstime;
};
                                
extern asmlinkage long sys_times(struct tms * tbuf);

asmlinkage long sys32_times(struct tms32 *tbuf)
{
	struct tms t;
	long ret;
	mm_segment_t old_fs = get_fs ();
	int err;
	
	set_fs (KERNEL_DS);
	ret = sys_times(tbuf ? &t : NULL);
	set_fs (old_fs);
	if (tbuf) {
		err = put_user (t.tms_utime, &tbuf->tms_utime);
		err |= __put_user (t.tms_stime, &tbuf->tms_stime);
		err |= __put_user (t.tms_cutime, &tbuf->tms_cutime);
		err |= __put_user (t.tms_cstime, &tbuf->tms_cstime);
		if (err)
			ret = -EFAULT;
	}
	return ret;
}

#define RLIM_INFINITY32	0x7fffffff
#define RESOURCE32(x) ((x > RLIM_INFINITY32) ? RLIM_INFINITY32 : x)

struct rlimit32 {
	u32	rlim_cur;
	u32	rlim_max;
};

extern asmlinkage int sys_getrlimit(unsigned int resource, struct rlimit *rlim);

asmlinkage int sys32_getrlimit(unsigned int resource, struct rlimit32 *rlim)
{
	struct rlimit r;
	int ret;
	mm_segment_t old_fs = get_fs ();
	
	set_fs (KERNEL_DS);
	ret = sys_getrlimit(resource, &r);
	set_fs (old_fs);
	if (!ret) {
		ret = put_user (RESOURCE32(r.rlim_cur), &rlim->rlim_cur);
		ret |= __put_user (RESOURCE32(r.rlim_max), &rlim->rlim_max);
	}
	return ret;
}

extern asmlinkage int sys_setrlimit(unsigned int resource, struct rlimit *rlim);

asmlinkage int sys32_setrlimit(unsigned int resource, struct rlimit32 *rlim)
{
	struct rlimit r;
	int ret;
	mm_segment_t old_fs = get_fs ();

	if (resource >= RLIM_NLIMITS) return -EINVAL;	
	if (get_user (r.rlim_cur, &rlim->rlim_cur) ||
	    __get_user (r.rlim_max, &rlim->rlim_max))
		return -EFAULT;
	if (r.rlim_cur == RLIM_INFINITY32)
		r.rlim_cur = RLIM_INFINITY;
	if (r.rlim_max == RLIM_INFINITY32)
		r.rlim_max = RLIM_INFINITY;
	set_fs (KERNEL_DS);
	ret = sys_setrlimit(resource, &r);
	set_fs (old_fs);
	return ret;
}

extern asmlinkage int sys_getrusage(int who, struct rusage *ru);

asmlinkage int sys32_getrusage(int who, struct rusage32 *ru)
{
	struct rusage r;
	int ret;
	mm_segment_t old_fs = get_fs();
		
	set_fs (KERNEL_DS);
	ret = sys_getrusage(who, &r);
	set_fs (old_fs);
	if (put_rusage (ru, &r)) return -EFAULT;
	return ret;
}

/* XXX This really belongs in some header file... -DaveM */
#define MAX_SOCK_ADDR	128		/* 108 for Unix domain - 
					   16 for IP, 16 for IPX,
					   24 for IPv6,
					   about 80 for AX.25 */

extern struct socket *sockfd_lookup(int fd, int *err);

/* XXX This as well... */
extern __inline__ void sockfd_put(struct socket *sock)
{
	fput(sock->file);
}

struct msghdr32 {
        u32               msg_name;
        int               msg_namelen;
        u32               msg_iov;
        __kernel_size_t32 msg_iovlen;
        u32               msg_control;
        __kernel_size_t32 msg_controllen;
        unsigned          msg_flags;
};

struct cmsghdr32 {
        __kernel_size_t32 cmsg_len;
        int               cmsg_level;
        int               cmsg_type;
};

/* Bleech... */
#define __CMSG32_NXTHDR(ctl, len, cmsg, cmsglen) __cmsg32_nxthdr((ctl),(len),(cmsg),(cmsglen))
#define CMSG32_NXTHDR(mhdr, cmsg, cmsglen) cmsg32_nxthdr((mhdr), (cmsg), (cmsglen))

#define CMSG32_ALIGN(len) ( ((len)+sizeof(int)-1) & ~(sizeof(int)-1) )

#define CMSG32_DATA(cmsg)	((void *)((char *)(cmsg) + CMSG32_ALIGN(sizeof(struct cmsghdr32))))
#define CMSG32_SPACE(len) (CMSG32_ALIGN(sizeof(struct cmsghdr32)) + CMSG32_ALIGN(len))
#define CMSG32_LEN(len) (CMSG32_ALIGN(sizeof(struct cmsghdr32)) + (len))

#define __CMSG32_FIRSTHDR(ctl,len) ((len) >= sizeof(struct cmsghdr32) ? \
				    (struct cmsghdr32 *)(ctl) : \
				    (struct cmsghdr32 *)NULL)
#define CMSG32_FIRSTHDR(msg)	__CMSG32_FIRSTHDR((msg)->msg_control, (msg)->msg_controllen)

__inline__ struct cmsghdr32 *__cmsg32_nxthdr(void *__ctl, __kernel_size_t __size,
					      struct cmsghdr32 *__cmsg, int __cmsg_len)
{
	struct cmsghdr32 * __ptr;

	__ptr = (struct cmsghdr32 *)(((unsigned char *) __cmsg) +
				     CMSG32_ALIGN(__cmsg_len));
	if ((unsigned long)((char*)(__ptr+1) - (char *) __ctl) > __size)
		return NULL;

	return __ptr;
}

__inline__ struct cmsghdr32 *cmsg32_nxthdr (struct msghdr *__msg,
					    struct cmsghdr32 *__cmsg,
					    int __cmsg_len)
{
	return __cmsg32_nxthdr(__msg->msg_control, __msg->msg_controllen,
			       __cmsg, __cmsg_len);
}

static inline int iov_from_user32_to_kern(struct iovec *kiov,
					  struct iovec32 *uiov32,
					  int niov)
{
	int tot_len = 0;

	while(niov > 0) {
		u32 len, buf;

		if(get_user(len, &uiov32->iov_len) ||
		   get_user(buf, &uiov32->iov_base)) {
			tot_len = -EFAULT;
			break;
		}
		tot_len += len;
		kiov->iov_base = (void *)A(buf);
		kiov->iov_len = (__kernel_size_t) len;
		uiov32++;
		kiov++;
		niov--;
	}
	return tot_len;
}

static inline int msghdr_from_user32_to_kern(struct msghdr *kmsg,
					     struct msghdr32 *umsg)
{
	u32 tmp1, tmp2, tmp3;
	int err;

	err = get_user(tmp1, &umsg->msg_name);
	err |= __get_user(tmp2, &umsg->msg_iov);
	err |= __get_user(tmp3, &umsg->msg_control);
	if (err)
		return -EFAULT;

	kmsg->msg_name = (void *)A(tmp1);
	kmsg->msg_iov = (struct iovec *)A(tmp2);
	kmsg->msg_control = (void *)A(tmp3);

	err = get_user(kmsg->msg_namelen, &umsg->msg_namelen);
	err |= get_user(kmsg->msg_iovlen, &umsg->msg_iovlen);
	err |= get_user(kmsg->msg_controllen, &umsg->msg_controllen);
	err |= get_user(kmsg->msg_flags, &umsg->msg_flags);
	
	return err;
}

/* I've named the args so it is easy to tell whose space the pointers are in. */
static int verify_iovec32(struct msghdr *kern_msg, struct iovec *kern_iov,
			  char *kern_address, int mode)
{
	int tot_len;

	if(kern_msg->msg_namelen) {
		if(mode==VERIFY_READ) {
			int err = move_addr_to_kernel(kern_msg->msg_name,
						      kern_msg->msg_namelen,
						      kern_address);
			if(err < 0)
				return err;
		}
		kern_msg->msg_name = kern_address;
	} else
		kern_msg->msg_name = NULL;

	if(kern_msg->msg_iovlen > UIO_FASTIOV) {
		kern_iov = kmalloc(kern_msg->msg_iovlen * sizeof(struct iovec),
				   GFP_KERNEL);
		if(!kern_iov)
			return -ENOMEM;
	}

	tot_len = iov_from_user32_to_kern(kern_iov,
					  (struct iovec32 *)kern_msg->msg_iov,
					  kern_msg->msg_iovlen);
	if(tot_len >= 0)
		kern_msg->msg_iov = kern_iov;
	else if(kern_msg->msg_iovlen > UIO_FASTIOV)
		kfree(kern_iov);

	return tot_len;
}

/* There is a lot of hair here because the alignment rules (and
 * thus placement) of cmsg headers and length are different for
 * 32-bit apps.  -DaveM
 */
static int cmsghdr_from_user32_to_kern(struct msghdr *kmsg,
				       unsigned char *stackbuf, int stackbuf_size)
{
	struct cmsghdr32 *ucmsg;
	struct cmsghdr *kcmsg, *kcmsg_base;
	__kernel_size_t32 ucmlen;
	__kernel_size_t kcmlen, tmp;

	kcmlen = 0;
	kcmsg_base = kcmsg = (struct cmsghdr *)stackbuf;
	ucmsg = CMSG32_FIRSTHDR(kmsg);
	while(ucmsg != NULL) {
		if(get_user(ucmlen, &ucmsg->cmsg_len))
			return -EFAULT;

		/* Catch bogons. */
		if(CMSG32_ALIGN(ucmlen) <
		   CMSG32_ALIGN(sizeof(struct cmsghdr32)))
			return -EINVAL;
		if((unsigned long)(((char *)ucmsg - (char *)kmsg->msg_control)
				   + ucmlen) > kmsg->msg_controllen)
			return -EINVAL;

		tmp = ((ucmlen - CMSG32_ALIGN(sizeof(*ucmsg))) +
		       CMSG_ALIGN(sizeof(struct cmsghdr)));
		kcmlen += tmp;
		ucmsg = CMSG32_NXTHDR(kmsg, ucmsg, ucmlen);
	}
	if(kcmlen == 0)
		return -EINVAL;

	/* The kcmlen holds the 64-bit version of the control length.
	 * It may not be modified as we do not stick it into the kmsg
	 * until we have successfully copied over all of the data
	 * from the user.
	 */
	if(kcmlen > stackbuf_size)
		kcmsg_base = kcmsg = kmalloc(kcmlen, GFP_KERNEL);
	if(kcmsg == NULL)
		return -ENOBUFS;

	/* Now copy them over neatly. */
	memset(kcmsg, 0, kcmlen);
	ucmsg = CMSG32_FIRSTHDR(kmsg);
	while(ucmsg != NULL) {
		__get_user(ucmlen, &ucmsg->cmsg_len);
		tmp = ((ucmlen - CMSG32_ALIGN(sizeof(*ucmsg))) +
		       CMSG_ALIGN(sizeof(struct cmsghdr)));
		kcmsg->cmsg_len = tmp;
		__get_user(kcmsg->cmsg_level, &ucmsg->cmsg_level);
		__get_user(kcmsg->cmsg_type, &ucmsg->cmsg_type);

		/* Copy over the data. */
		if(copy_from_user(CMSG_DATA(kcmsg),
				  CMSG32_DATA(ucmsg),
				  (ucmlen - CMSG32_ALIGN(sizeof(*ucmsg)))))
			goto out_free_efault;

		/* Advance. */
		kcmsg = (struct cmsghdr *)((char *)kcmsg + CMSG_ALIGN(tmp));
		ucmsg = CMSG32_NXTHDR(kmsg, ucmsg, ucmlen);
	}

	/* Ok, looks like we made it.  Hook it up and return success. */
	kmsg->msg_control = kcmsg_base;
	kmsg->msg_controllen = kcmlen;
	return 0;

out_free_efault:
	if(kcmsg_base != (struct cmsghdr *)stackbuf)
		kfree(kcmsg_base);
	return -EFAULT;
}

static void put_cmsg32(struct msghdr *kmsg, int level, int type,
		       int len, void *data)
{
	struct cmsghdr32 *cm = (struct cmsghdr32 *) kmsg->msg_control;
	struct cmsghdr32 cmhdr;
	int cmlen = CMSG32_LEN(len);

	if(cm == NULL || kmsg->msg_controllen < sizeof(*cm)) {
		kmsg->msg_flags |= MSG_CTRUNC;
		return;
	}

	if(kmsg->msg_controllen < cmlen) {
		kmsg->msg_flags |= MSG_CTRUNC;
		cmlen = kmsg->msg_controllen;
	}
	cmhdr.cmsg_level = level;
	cmhdr.cmsg_type = type;
	cmhdr.cmsg_len = cmlen;

	if(copy_to_user(cm, &cmhdr, sizeof cmhdr))
		return;
	if(copy_to_user(CMSG32_DATA(cm), data, cmlen - sizeof(struct cmsghdr32)))
		return;
	cmlen = CMSG32_SPACE(len);
	kmsg->msg_control += cmlen;
	kmsg->msg_controllen -= cmlen;
}

static void scm_detach_fds32(struct msghdr *kmsg, struct scm_cookie *scm)
{
	struct cmsghdr32 *cm = (struct cmsghdr32 *) kmsg->msg_control;
	int fdmax = (kmsg->msg_controllen - sizeof(struct cmsghdr32)) / sizeof(int);
	int fdnum = scm->fp->count;
	struct file **fp = scm->fp->fp;
	int *cmfptr;
	int err = 0, i;

	if (fdnum < fdmax)
		fdmax = fdnum;

	for (i = 0, cmfptr = (int *) CMSG32_DATA(cm); i < fdmax; i++, cmfptr++) {
		int new_fd;
		err = get_unused_fd();
		if (err < 0)
			break;
		new_fd = err;
		err = put_user(new_fd, cmfptr);
		if (err) {
			put_unused_fd(new_fd);
			break;
		}
		/* Bump the usage count and install the file. */
		get_file(fp[i]);
		fd_install(new_fd, fp[i]);
	}

	if (i > 0) {