[mirror_ubuntu-bionic-kernel.git] / arch / sparc / kernel / sys_sparc_32.c

/* linux/arch/sparc/kernel/sys_sparc.c
 *
 * This file contains various random system calls that
 * have a non-standard calling sequence on the Linux/sparc
 * platform.
 */

#include <linux/errno.h>
#include <linux/types.h>
#include <linux/sched.h>
#include <linux/mm.h>
#include <linux/fs.h>
#include <linux/file.h>
#include <linux/sem.h>
#include <linux/msg.h>
#include <linux/shm.h>
#include <linux/stat.h>
#include <linux/syscalls.h>
#include <linux/mman.h>
#include <linux/utsname.h>
#include <linux/smp.h>
#include <linux/smp_lock.h>
#include <linux/ipc.h>

#include <asm/uaccess.h>
#include <asm/unistd.h>

/* #define DEBUG_UNIMP_SYSCALL */

/* XXX Make this per-binary type, this way we can detect the type of
 * XXX a binary.  Every Sparc executable calls this very early on.
 */
asmlinkage unsigned long sys_getpagesize(void)
{
	return PAGE_SIZE; /* Possibly older binaries want 8192 on sun4's? */
}

#define COLOUR_ALIGN(addr)      (((addr)+SHMLBA-1)&~(SHMLBA-1))

unsigned long arch_get_unmapped_area(struct file *filp, unsigned long addr, unsigned long len, unsigned long pgoff, unsigned long flags)
{
	struct vm_area_struct * vmm;

	if (flags & MAP_FIXED) {
		/* We do not accept a shared mapping if it would violate
		 * cache aliasing constraints.
		 */
		if ((flags & MAP_SHARED) && (addr & (SHMLBA - 1)))
			return -EINVAL;
		return addr;
	}

	/* See asm-sparc/uaccess.h */
	if (len > TASK_SIZE - PAGE_SIZE)
		return -ENOMEM;
	if (ARCH_SUN4C && len > 0x20000000)
		return -ENOMEM;
	if (!addr)
		addr = TASK_UNMAPPED_BASE;

	if (flags & MAP_SHARED)
		addr = COLOUR_ALIGN(addr);
	else
		addr = PAGE_ALIGN(addr);

	for (vmm = find_vma(current->mm, addr); ; vmm = vmm->vm_next) {
		/* At this point:  (!vmm || addr < vmm->vm_end). */
		if (ARCH_SUN4C && addr < 0xe0000000 && 0x20000000 - len < addr) {
			addr = PAGE_OFFSET;
			vmm = find_vma(current->mm, PAGE_OFFSET);
		}
		if (TASK_SIZE - PAGE_SIZE - len < addr)
			return -ENOMEM;
		if (!vmm || addr + len <= vmm->vm_start)
			return addr;
		addr = vmm->vm_end;
		if (flags & MAP_SHARED)
			addr = COLOUR_ALIGN(addr);
	}
}

/*
 * sys_pipe() is the normal C calling standard for creating
 * a pipe. It's not the way unix traditionally does this, though.
 */
asmlinkage int sparc_pipe(struct pt_regs *regs)
{
	int fd[2];
	int error;

	error = do_pipe_flags(fd, 0);
	if (error)
		goto out;
	regs->u_regs[UREG_I1] = fd[1];
	error = fd[0];
out:
	return error;
}

/*
 * sys_ipc() is the de-multiplexer for the SysV IPC calls..
 *
 * This is really horribly ugly.
 */

asmlinkage int sys_ipc (uint call, int first, int second, int third, void __user *ptr, long fifth)
{
	int version, err;

	version = call >> 16; /* hack for backward compatibility */
	call &= 0xffff;

	if (call <= SEMCTL)
		switch (call) {
		case SEMOP:
			err = sys_semtimedop (first, (struct sembuf __user *)ptr, second, NULL);
			goto out;
		case SEMTIMEDOP:
			err = sys_semtimedop (first, (struct sembuf __user *)ptr, second, (const struct timespec __user *) fifth);
			goto out;
		case SEMGET:
			err = sys_semget (first, second, third);
			goto out;
		case SEMCTL: {
			union semun fourth;
			err = -EINVAL;
			if (!ptr)
				goto out;
			err = -EFAULT;
			if (get_user(fourth.__pad,
				     (void __user * __user *)ptr))
				goto out;
			err = sys_semctl (first, second, third, fourth);
			goto out;
			}
		default:
			err = -ENOSYS;
			goto out;
		}
	if (call <= MSGCTL) 
		switch (call) {
		case MSGSND:
			err = sys_msgsnd (first, (struct msgbuf __user *) ptr, 
					  second, third);
			goto out;
		case MSGRCV:
			switch (version) {
			case 0: {
				struct ipc_kludge tmp;
				err = -EINVAL;
				if (!ptr)
					goto out;
				err = -EFAULT;
				if (copy_from_user(&tmp, (struct ipc_kludge __user *) ptr, sizeof (tmp)))
					goto out;
				err = sys_msgrcv (first, tmp.msgp, second, tmp.msgtyp, third);
				goto out;
				}
			case 1: default:
				err = sys_msgrcv (first,
						  (struct msgbuf __user *) ptr,
						  second, fifth, third);
				goto out;
			}
		case MSGGET:
			err = sys_msgget ((key_t) first, second);
			goto out;
		case MSGCTL:
			err = sys_msgctl (first, second, (struct msqid_ds __user *) ptr);
			goto out;
		default:
			err = -ENOSYS;
			goto out;
		}
	if (call <= SHMCTL) 
		switch (call) {
		case SHMAT:
			switch (version) {
			case 0: default: {
				ulong raddr;
				err = do_shmat (first, (char __user *) ptr, second, &raddr);
				if (err)
					goto out;
				err = -EFAULT;
				if (put_user (raddr, (ulong __user *) third))
					goto out;
				err = 0;
				goto out;
				}
			case 1:	/* iBCS2 emulator entry point */
				err = -EINVAL;
				goto out;
			}
		case SHMDT: 
			err = sys_shmdt ((char __user *)ptr);
			goto out;
		case SHMGET:
			err = sys_shmget (first, second, third);
			goto out;
		case SHMCTL:
			err = sys_shmctl (first, second, (struct shmid_ds __user *) ptr);
			goto out;
		default:
			err = -ENOSYS;
			goto out;
		}
	else
		err = -ENOSYS;
out:
	return err;
}

int sparc_mmap_check(unsigned long addr, unsigned long len)
{
	if (ARCH_SUN4C &&
	    (len > 0x20000000 ||
	     (addr < 0xe0000000 && addr + len > 0x20000000)))
		return -EINVAL;

	/* See asm-sparc/uaccess.h */
	if (len > TASK_SIZE - PAGE_SIZE || addr + len > TASK_SIZE - PAGE_SIZE)
		return -EINVAL;

	return 0;
}

/* Linux version of mmap */

asmlinkage unsigned long sys_mmap2(unsigned long addr, unsigned long len,
	unsigned long prot, unsigned long flags, unsigned long fd,
	unsigned long pgoff)
{
	/* Make sure the shift for mmap2 is constant (12), no matter what PAGE_SIZE
	   we have. */
	return sys_mmap_pgoff(addr, len, prot, flags, fd,
			      pgoff >> (PAGE_SHIFT - 12));
}

asmlinkage unsigned long sys_mmap(unsigned long addr, unsigned long len,
	unsigned long prot, unsigned long flags, unsigned long fd,
	unsigned long off)
{
	/* no alignment check? */
	return sys_mmap_pgoff(addr, len, prot, flags, fd, off >> PAGE_SHIFT);
}

long sparc_remap_file_pages(unsigned long start, unsigned long size,
			   unsigned long prot, unsigned long pgoff,
			   unsigned long flags)
{
	/* This works on an existing mmap so we don't need to validate
	 * the range as that was done at the original mmap call.
	 */
	return sys_remap_file_pages(start, size, prot,
				    (pgoff >> (PAGE_SHIFT - 12)), flags);
}

/* we come to here via sys_nis_syscall so it can setup the regs argument */
asmlinkage unsigned long
c_sys_nis_syscall (struct pt_regs *regs)
{
	static int count = 0;

	if (count++ > 5)
		return -ENOSYS;
	printk ("%s[%d]: Unimplemented SPARC system call %d\n",
		current->comm, task_pid_nr(current), (int)regs->u_regs[1]);
#ifdef DEBUG_UNIMP_SYSCALL	
	show_regs (regs);
#endif
	return -ENOSYS;
}

/* #define DEBUG_SPARC_BREAKPOINT */

asmlinkage void
sparc_breakpoint (struct pt_regs *regs)
{
	siginfo_t info;

	lock_kernel();
#ifdef DEBUG_SPARC_BREAKPOINT
        printk ("TRAP: Entering kernel PC=%x, nPC=%x\n", regs->pc, regs->npc);
#endif
	info.si_signo = SIGTRAP;
	info.si_errno = 0;
	info.si_code = TRAP_BRKPT;
	info.si_addr = (void __user *)regs->pc;
	info.si_trapno = 0;
	force_sig_info(SIGTRAP, &info, current);

#ifdef DEBUG_SPARC_BREAKPOINT
	printk ("TRAP: Returning to space: PC=%x nPC=%x\n", regs->pc, regs->npc);
#endif
	unlock_kernel();
}

asmlinkage int
sparc_sigaction (int sig, const struct old_sigaction __user *act,
		 struct old_sigaction __user *oact)
{
	struct k_sigaction new_ka, old_ka;
	int ret;

	WARN_ON_ONCE(sig >= 0);
	sig = -sig;

	if (act) {
		unsigned long mask;

		if (!access_ok(VERIFY_READ, act, sizeof(*act)) ||
		    __get_user(new_ka.sa.sa_handler, &act->sa_handler) ||
		    __get_user(new_ka.sa.sa_restorer, &act->sa_restorer))
			return -EFAULT;
		__get_user(new_ka.sa.sa_flags, &act->sa_flags);
		__get_user(mask, &act->sa_mask);
		siginitset(&new_ka.sa.sa_mask, mask);
		new_ka.ka_restorer = NULL;
	}

	ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);

	if (!ret && oact) {
		/* In the clone() case we could copy half consistent
		 * state to the user, however this could sleep and
		 * deadlock us if we held the signal lock on SMP.  So for
		 * now I take the easy way out and do no locking.
		 */
		if (!access_ok(VERIFY_WRITE, oact, sizeof(*oact)) ||
		    __put_user(old_ka.sa.sa_handler, &oact->sa_handler) ||
		    __put_user(old_ka.sa.sa_restorer, &oact->sa_restorer))
			return -EFAULT;
		__put_user(old_ka.sa.sa_flags, &oact->sa_flags);
		__put_user(old_ka.sa.sa_mask.sig[0], &oact->sa_mask);
	}

	return ret;
}

asmlinkage long
sys_rt_sigaction(int sig,
		 const struct sigaction __user *act,
		 struct sigaction __user *oact,
		 void __user *restorer,
		 size_t sigsetsize)
{
	struct k_sigaction new_ka, old_ka;
	int ret;

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

	if (act) {
		new_ka.ka_restorer = restorer;
		if (copy_from_user(&new_ka.sa, act, sizeof(*act)))
			return -EFAULT;
	}

	ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);

	if (!ret && oact) {
		if (copy_to_user(oact, &old_ka.sa, sizeof(*oact)))
			return -EFAULT;
	}

	return ret;
}

asmlinkage int sys_getdomainname(char __user *name, int len)
{
 	int nlen, err;
 	
	if (len < 0)
		return -EINVAL;

 	down_read(&uts_sem);
 	
	nlen = strlen(utsname()->domainname) + 1;
	err = -EINVAL;
	if (nlen > len)
		goto out;

	err = -EFAULT;
	if (!copy_to_user(name, utsname()->domainname, nlen))
		err = 0;

out:
	up_read(&uts_sem);
	return err;
}

/*
 * Do a system call from kernel instead of calling sys_execve so we
 * end up with proper pt_regs.
 */
int kernel_execve(const char *filename, char *const argv[], char *const envp[])
{
	long __res;
	register long __g1 __asm__ ("g1") = __NR_execve;
	register long __o0 __asm__ ("o0") = (long)(filename);
	register long __o1 __asm__ ("o1") = (long)(argv);
	register long __o2 __asm__ ("o2") = (long)(envp);
	asm volatile ("t 0x10\n\t"
		      "bcc 1f\n\t"
		      "mov %%o0, %0\n\t"
		      "sub %%g0, %%o0, %0\n\t"
		      "1:\n\t"
		      : "=r" (__res), "=&r" (__o0)
		      : "1" (__o0), "r" (__o1), "r" (__o2), "r" (__g1)
		      : "cc");
	return __res;
}
Commit	Line	Data
5526b7e4	1	/* linux/arch/sparc/kernel/sys_sparc.c
1da177e4 LT	2	*
	3	* This file contains various random system calls that
	4	* have a non-standard calling sequence on the Linux/sparc
	5	* platform.
	6	*/
	7
	8	#include <linux/errno.h>
	9	#include <linux/types.h>
	10	#include <linux/sched.h>
	11	#include <linux/mm.h>
	12	#include <linux/fs.h>
	13	#include <linux/file.h>
	14	#include <linux/sem.h>
	15	#include <linux/msg.h>
	16	#include <linux/shm.h>
	17	#include <linux/stat.h>
	18	#include <linux/syscalls.h>
	19	#include <linux/mman.h>
	20	#include <linux/utsname.h>
	21	#include <linux/smp.h>
	22	#include <linux/smp_lock.h>
cba4fbbf	23	#include <linux/ipc.h>
1da177e4 LT	24
1da177e4 LT	25	#include <asm/uaccess.h>
fe74290d	26	#include <asm/unistd.h>
1da177e4 LT	27
	28	/* #define DEBUG_UNIMP_SYSCALL */
	29
	30	/* XXX Make this per-binary type, this way we can detect the type of
	31	* XXX a binary. Every Sparc executable calls this very early on.
	32	*/
	33	asmlinkage unsigned long sys_getpagesize(void)
	34	{
	35	return PAGE_SIZE; /* Possibly older binaries want 8192 on sun4's? */
	36	}
	37
	38	#define COLOUR_ALIGN(addr) (((addr)+SHMLBA-1)&~(SHMLBA-1))
	39
	40	unsigned long arch_get_unmapped_area(struct file *filp, unsigned long addr, unsigned long len, unsigned long pgoff, unsigned long flags)
	41	{
	42	struct vm_area_struct * vmm;
	43
	44	if (flags & MAP_FIXED) {
	45	/* We do not accept a shared mapping if it would violate
	46	* cache aliasing constraints.
	47	*/
	48	if ((flags & MAP_SHARED) && (addr & (SHMLBA - 1)))
	49	return -EINVAL;
	50	return addr;
	51	}
	52
	53	/* See asm-sparc/uaccess.h */
	54	if (len > TASK_SIZE - PAGE_SIZE)
	55	return -ENOMEM;
5110bd21	56	if (ARCH_SUN4C && len > 0x20000000)
1da177e4 LT	57	return -ENOMEM;
	58	if (!addr)
	59	addr = TASK_UNMAPPED_BASE;
	60
	61	if (flags & MAP_SHARED)
	62	addr = COLOUR_ALIGN(addr);
	63	else
	64	addr = PAGE_ALIGN(addr);
	65
	66	for (vmm = find_vma(current->mm, addr); ; vmm = vmm->vm_next) {
	67	/* At this point: (!vmm \|\| addr < vmm->vm_end). */
5110bd21	68	if (ARCH_SUN4C && addr < 0xe0000000 && 0x20000000 - len < addr) {
1da177e4 LT	69	addr = PAGE_OFFSET;
	70	vmm = find_vma(current->mm, PAGE_OFFSET);
	71	}
	72	if (TASK_SIZE - PAGE_SIZE - len < addr)
	73	return -ENOMEM;
	74	if (!vmm \|\| addr + len <= vmm->vm_start)
	75	return addr;
	76	addr = vmm->vm_end;
	77	if (flags & MAP_SHARED)
	78	addr = COLOUR_ALIGN(addr);
	79	}
	80	}
	81
1da177e4 LT	82	/*
	83	* sys_pipe() is the normal C calling standard for creating
	84	* a pipe. It's not the way unix traditionally does this, though.
	85	*/
	86	asmlinkage int sparc_pipe(struct pt_regs *regs)
	87	{
	88	int fd[2];
	89	int error;
	90
ed8cae8b	91	error = do_pipe_flags(fd, 0);
1da177e4 LT	92	if (error)
	93	goto out;
	94	regs->u_regs[UREG_I1] = fd[1];
	95	error = fd[0];
	96	out:
	97	return error;
	98	}
	99
	100	/*
	101	* sys_ipc() is the de-multiplexer for the SysV IPC calls..
	102	*
	103	* This is really horribly ugly.
	104	*/
	105
	106	asmlinkage int sys_ipc (uint call, int first, int second, int third, void __user *ptr, long fifth)
	107	{
	108	int version, err;
	109
	110	version = call >> 16; /* hack for backward compatibility */
	111	call &= 0xffff;
	112
	113	if (call <= SEMCTL)
	114	switch (call) {
	115	case SEMOP:
	116	err = sys_semtimedop (first, (struct sembuf __user *)ptr, second, NULL);
	117	goto out;
	118	case SEMTIMEDOP:
	119	err = sys_semtimedop (first, (struct sembuf __user )ptr, second, (const struct timespec __user ) fifth);
	120	goto out;
	121	case SEMGET:
	122	err = sys_semget (first, second, third);
	123	goto out;
	124	case SEMCTL: {
	125	union semun fourth;
	126	err = -EINVAL;
	127	if (!ptr)
	128	goto out;
	129	err = -EFAULT;
	130	if (get_user(fourth.__pad,
	131	(void __user * __user *)ptr))
	132	goto out;
	133	err = sys_semctl (first, second, third, fourth);
	134	goto out;
	135	}
	136	default:
	137	err = -ENOSYS;
	138	goto out;
	139	}
	140	if (call <= MSGCTL)
	141	switch (call) {
	142	case MSGSND:
	143	err = sys_msgsnd (first, (struct msgbuf __user *) ptr,
	144	second, third);
	145	goto out;
	146	case MSGRCV:
	147	switch (version) {
	148	case 0: {
	149	struct ipc_kludge tmp;
	150	err = -EINVAL;
	151	if (!ptr)
	152	goto out;
	153	err = -EFAULT;
	154	if (copy_from_user(&tmp, (struct ipc_kludge __user *) ptr, sizeof (tmp)))
	155	goto out;
156	err = sys_msgrcv (first, tmp.msgp, second, tmp.msgtyp, third);
157	goto out;
158	}
159	case 1: default:
160	err = sys_msgrcv (first,
161	(struct msgbuf __user *) ptr,
162	second, fifth, third);
163	goto out;
164	}
165	case MSGGET:
166	err = sys_msgget ((key_t) first, second);
167	goto out;
168	case MSGCTL:
169	err = sys_msgctl (first, second, (struct msqid_ds __user *) ptr);
170	goto out;
171	default:
172	err = -ENOSYS;
173	goto out;
174	}
175	if (call <= SHMCTL)
176	switch (call) {
177	case SHMAT:
178	switch (version) {
179	case 0: default: {
180	ulong raddr;
181	err = do_shmat (first, (char __user *) ptr, second, &raddr);
182	if (err)
183	goto out;
184	err = -EFAULT;
185	if (put_user (raddr, (ulong __user *) third))
186	goto out;
187	err = 0;
188	goto out;
189	}
190	case 1: /* iBCS2 emulator entry point */
191	err = -EINVAL;
192	goto out;
193	}
194	case SHMDT:
195	err = sys_shmdt ((char __user *)ptr);
196	goto out;
197	case SHMGET:
198	err = sys_shmget (first, second, third);
199	goto out;
200	case SHMCTL:
201	err = sys_shmctl (first, second, (struct shmid_ds __user *) ptr);
202	goto out;
203	default:
204	err = -ENOSYS;
205	goto out;
206	}
207	else
208	err = -ENOSYS;
209	out:
210	return err;
211	}
212
94d149c3	213	int sparc_mmap_check(unsigned long addr, unsigned long len)
3a459756	214	{
5110bd21	215	if (ARCH_SUN4C &&
3a459756	216	(len > 0x20000000 \|\|
58163393	217	(addr < 0xe0000000 && addr + len > 0x20000000)))
3a459756 KK	218	return -EINVAL;
	219
	220	/* See asm-sparc/uaccess.h */
	221	if (len > TASK_SIZE - PAGE_SIZE \|\| addr + len > TASK_SIZE - PAGE_SIZE)
	222	return -EINVAL;
	223
	224	return 0;
	225	}
	226
1da177e4	227	/* Linux version of mmap */
1da177e4 LT	228
	229	asmlinkage unsigned long sys_mmap2(unsigned long addr, unsigned long len,
	230	unsigned long prot, unsigned long flags, unsigned long fd,
	231	unsigned long pgoff)
	232	{
	233	/* Make sure the shift for mmap2 is constant (12), no matter what PAGE_SIZE
	234	we have. */
f8b72560 AV	235	return sys_mmap_pgoff(addr, len, prot, flags, fd,
f8b72560 AV	236	pgoff >> (PAGE_SHIFT - 12));
1da177e4 LT	237	}
	238
	239	asmlinkage unsigned long sys_mmap(unsigned long addr, unsigned long len,
	240	unsigned long prot, unsigned long flags, unsigned long fd,
	241	unsigned long off)
	242	{
f8b72560 AV	243	/* no alignment check? */
f8b72560 AV	244	return sys_mmap_pgoff(addr, len, prot, flags, fd, off >> PAGE_SHIFT);
1da177e4 LT	245	}
	246
	247	long sparc_remap_file_pages(unsigned long start, unsigned long size,
	248	unsigned long prot, unsigned long pgoff,
	249	unsigned long flags)
	250	{
	251	/* This works on an existing mmap so we don't need to validate
	252	* the range as that was done at the original mmap call.
	253	*/
	254	return sys_remap_file_pages(start, size, prot,
	255	(pgoff >> (PAGE_SHIFT - 12)), flags);
	256	}
	257
1da177e4 LT	258	/* we come to here via sys_nis_syscall so it can setup the regs argument */
	259	asmlinkage unsigned long
	260	c_sys_nis_syscall (struct pt_regs *regs)
	261	{
	262	static int count = 0;
	263
	264	if (count++ > 5)
	265	return -ENOSYS;
	266	printk ("%s[%d]: Unimplemented SPARC system call %d\n",
19c5870c	267	current->comm, task_pid_nr(current), (int)regs->u_regs[1]);
1da177e4 LT	268	#ifdef DEBUG_UNIMP_SYSCALL
	269	show_regs (regs);
	270	#endif
	271	return -ENOSYS;
	272	}
	273
	274	/* #define DEBUG_SPARC_BREAKPOINT */
	275
	276	asmlinkage void
	277	sparc_breakpoint (struct pt_regs *regs)
	278	{
	279	siginfo_t info;
	280
	281	lock_kernel();
	282	#ifdef DEBUG_SPARC_BREAKPOINT
	283	printk ("TRAP: Entering kernel PC=%x, nPC=%x\n", regs->pc, regs->npc);
	284	#endif
	285	info.si_signo = SIGTRAP;
	286	info.si_errno = 0;
	287	info.si_code = TRAP_BRKPT;
	288	info.si_addr = (void __user *)regs->pc;
	289	info.si_trapno = 0;
	290	force_sig_info(SIGTRAP, &info, current);
	291
	292	#ifdef DEBUG_SPARC_BREAKPOINT
	293	printk ("TRAP: Returning to space: PC=%x nPC=%x\n", regs->pc, regs->npc);
	294	#endif
	295	unlock_kernel();
	296	}
	297
	298	asmlinkage int
	299	sparc_sigaction (int sig, const struct old_sigaction __user *act,
	300	struct old_sigaction __user *oact)
	301	{
	302	struct k_sigaction new_ka, old_ka;
	303	int ret;
	304
5526b7e4 DM	305	WARN_ON_ONCE(sig >= 0);
5526b7e4 DM	306	sig = -sig;
1da177e4 LT	307
	308	if (act) {
	309	unsigned long mask;
	310
	311	if (!access_ok(VERIFY_READ, act, sizeof(*act)) \|\|
	312	__get_user(new_ka.sa.sa_handler, &act->sa_handler) \|\|
	313	__get_user(new_ka.sa.sa_restorer, &act->sa_restorer))
	314	return -EFAULT;
	315	__get_user(new_ka.sa.sa_flags, &act->sa_flags);
	316	__get_user(mask, &act->sa_mask);
	317	siginitset(&new_ka.sa.sa_mask, mask);
	318	new_ka.ka_restorer = NULL;
	319	}
	320
	321	ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);
	322
	323	if (!ret && oact) {
	324	/* In the clone() case we could copy half consistent
	325	* state to the user, however this could sleep and
	326	* deadlock us if we held the signal lock on SMP. So for
	327	* now I take the easy way out and do no locking.
	328	*/
	329	if (!access_ok(VERIFY_WRITE, oact, sizeof(*oact)) \|\|
	330	__put_user(old_ka.sa.sa_handler, &oact->sa_handler) \|\|
	331	__put_user(old_ka.sa.sa_restorer, &oact->sa_restorer))
	332	return -EFAULT;
	333	__put_user(old_ka.sa.sa_flags, &oact->sa_flags);
	334	__put_user(old_ka.sa.sa_mask.sig[0], &oact->sa_mask);
	335	}
	336
	337	return ret;
	338	}
	339
	340	asmlinkage long
	341	sys_rt_sigaction(int sig,
	342	const struct sigaction __user *act,
	343	struct sigaction __user *oact,
	344	void __user *restorer,
	345	size_t sigsetsize)
	346	{
	347	struct k_sigaction new_ka, old_ka;
	348	int ret;
	349
	350	/* XXX: Don't preclude handling different sized sigset_t's. */
	351	if (sigsetsize != sizeof(sigset_t))
	352	return -EINVAL;
	353
1da177e4 LT	354	if (act) {
	355	new_ka.ka_restorer = restorer;
	356	if (copy_from_user(&new_ka.sa, act, sizeof(*act)))
	357	return -EFAULT;
	358	}
	359
	360	ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);
	361
	362	if (!ret && oact) {
	363	if (copy_to_user(oact, &old_ka.sa, sizeof(*oact)))
	364	return -EFAULT;
	365	}
	366
	367	return ret;
	368	}
	369
	370	asmlinkage int sys_getdomainname(char __user *name, int len)
	371	{
8310a32c	372	int nlen, err;
1da177e4	373
b9c54f91	374	if (len < 0)
8310a32c DM	375	return -EINVAL;
8310a32c DM	376
1da177e4 LT	377	down_read(&uts_sem);
1da177e4 LT	378
e9ff3990	379	nlen = strlen(utsname()->domainname) + 1;
b9c54f91 AW	380	err = -EINVAL;
	381	if (nlen > len)
	382	goto out;
8310a32c DM	383
8310a32c DM	384	err = -EFAULT;
e9ff3990	385	if (!copy_to_user(name, utsname()->domainname, nlen))
8310a32c DM	386	err = 0;
8310a32c DM	387
b9c54f91	388	out:
1da177e4 LT	389	up_read(&uts_sem);
	390	return err;
	391	}
fe74290d AB	392
	393	/*
	394	* Do a system call from kernel instead of calling sys_execve so we
	395	* end up with proper pt_regs.
	396	*/
	397	int kernel_execve(const char filename, char const argv[], char *const envp[])
	398	{
	399	long __res;
	400	register long __g1 __asm__ ("g1") = __NR_execve;
	401	register long __o0 __asm__ ("o0") = (long)(filename);
	402	register long __o1 __asm__ ("o1") = (long)(argv);
	403	register long __o2 __asm__ ("o2") = (long)(envp);
	404	asm volatile ("t 0x10\n\t"
	405	"bcc 1f\n\t"
	406	"mov %%o0, %0\n\t"
	407	"sub %%g0, %%o0, %0\n\t"
	408	"1:\n\t"
	409	: "=r" (__res), "=&r" (__o0)
	410	: "1" (__o0), "r" (__o1), "r" (__o2), "r" (__g1)
	411	: "cc");
	412	return __res;
	413	}