[net-next-2.6.git] / arch / sparc / kernel / sys_sparc.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_SUN4 && 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_SUN4 && 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);
	}
}

asmlinkage unsigned long sparc_brk(unsigned long brk)
{
	if(ARCH_SUN4C_SUN4) {
		if ((brk & 0xe0000000) != (current->mm->brk & 0xe0000000))
			return current->mm->brk;
	}
	return sys_brk(brk);
}

/*
 * 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(fd);
	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, unsigned long flags)
{
	if (ARCH_SUN4C_SUN4 &&
	    (len > 0x20000000 ||
	     ((flags & MAP_FIXED) &&
	      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 */
static unsigned long do_mmap2(unsigned long addr, unsigned long len,
	unsigned long prot, unsigned long flags, unsigned long fd,
	unsigned long pgoff)
{
	struct file * file = NULL;
	unsigned long retval = -EBADF;

	if (!(flags & MAP_ANONYMOUS)) {
		file = fget(fd);
		if (!file)
			goto out;
	}

	len = PAGE_ALIGN(len);
	flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE);

	down_write(&current->mm->mmap_sem);
	retval = do_mmap_pgoff(file, addr, len, prot, flags, pgoff);
	up_write(&current->mm->mmap_sem);

	if (file)
		fput(file);
out:
	return retval;
}

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 do_mmap2(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)
{
	return do_mmap2(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);
}

extern unsigned long do_mremap(unsigned long addr,
	unsigned long old_len, unsigned long new_len,
	unsigned long flags, unsigned long new_addr);
                
asmlinkage unsigned long sparc_mremap(unsigned long addr,
	unsigned long old_len, unsigned long new_len,
	unsigned long flags, unsigned long new_addr)
{
	struct vm_area_struct *vma;
	unsigned long ret = -EINVAL;
	if (ARCH_SUN4C_SUN4) {
		if (old_len > 0x20000000 || new_len > 0x20000000)
			goto out;
		if (addr < 0xe0000000 && addr + old_len > 0x20000000)
			goto out;
	}
	if (old_len > TASK_SIZE - PAGE_SIZE ||
	    new_len > TASK_SIZE - PAGE_SIZE)
		goto out;
	down_write(&current->mm->mmap_sem);
	if (flags & MREMAP_FIXED) {
		if (ARCH_SUN4C_SUN4 &&
		    new_addr < 0xe0000000 &&
		    new_addr + new_len > 0x20000000)
			goto out_sem;
		if (new_addr + new_len > TASK_SIZE - PAGE_SIZE)
			goto out_sem;
	} else if ((ARCH_SUN4C_SUN4 && addr < 0xe0000000 &&
		    addr + new_len > 0x20000000) ||
		   addr + new_len > TASK_SIZE - PAGE_SIZE) {
		unsigned long map_flags = 0;
		struct file *file = NULL;

		ret = -ENOMEM;
		if (!(flags & MREMAP_MAYMOVE))
			goto out_sem;

		vma = find_vma(current->mm, addr);
		if (vma) {
			if (vma->vm_flags & VM_SHARED)
				map_flags |= MAP_SHARED;
			file = vma->vm_file;
		}

		new_addr = get_unmapped_area(file, addr, new_len,
				     vma ? vma->vm_pgoff : 0,
				     map_flags);
		ret = new_addr;
		if (new_addr & ~PAGE_MASK)
			goto out_sem;
		flags |= MREMAP_FIXED;
	}
	ret = do_mremap(addr, old_len, new_len, flags, new_addr);
out_sem:
	up_write(&current->mm->mmap_sem);
out:
	return ret;       
}

/* 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;
	56	if (ARCH_SUN4C_SUN4 && len > 0x20000000)
	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). */
	68	if (ARCH_SUN4C_SUN4 && addr < 0xe0000000 && 0x20000000 - len < addr) {
	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
	82	asmlinkage unsigned long sparc_brk(unsigned long brk)
	83	{
	84	if(ARCH_SUN4C_SUN4) {
	85	if ((brk & 0xe0000000) != (current->mm->brk & 0xe0000000))
	86	return current->mm->brk;
	87	}
	88	return sys_brk(brk);
	89	}
	90
91	/*
92	* sys_pipe() is the normal C calling standard for creating
93	* a pipe. It's not the way unix traditionally does this, though.
94	*/
95	asmlinkage int sparc_pipe(struct pt_regs *regs)
96	{
97	int fd[2];
98	int error;
99
100	error = do_pipe(fd);
101	if (error)
102	goto out;
103	regs->u_regs[UREG_I1] = fd[1];
104	error = fd[0];
105	out:
106	return error;
107	}
108
109	/*
110	* sys_ipc() is the de-multiplexer for the SysV IPC calls..
111	*
112	* This is really horribly ugly.
113	*/
114
115	asmlinkage int sys_ipc (uint call, int first, int second, int third, void __user *ptr, long fifth)
116	{
117	int version, err;
118
119	version = call >> 16; /* hack for backward compatibility */
120	call &= 0xffff;
121
122	if (call <= SEMCTL)
123	switch (call) {
124	case SEMOP:
125	err = sys_semtimedop (first, (struct sembuf __user *)ptr, second, NULL);
126	goto out;
127	case SEMTIMEDOP:
128	err = sys_semtimedop (first, (struct sembuf __user )ptr, second, (const struct timespec __user ) fifth);
129	goto out;
130	case SEMGET:
131	err = sys_semget (first, second, third);
132	goto out;
133	case SEMCTL: {
134	union semun fourth;
135	err = -EINVAL;
136	if (!ptr)
137	goto out;
138	err = -EFAULT;
139	if (get_user(fourth.__pad,
140	(void __user * __user *)ptr))
141	goto out;
142	err = sys_semctl (first, second, third, fourth);
143	goto out;
144	}
145	default:
146	err = -ENOSYS;
147	goto out;
148	}
149	if (call <= MSGCTL)
150	switch (call) {
151	case MSGSND:
152	err = sys_msgsnd (first, (struct msgbuf __user *) ptr,
153	second, third);
154	goto out;
155	case MSGRCV:
156	switch (version) {
157	case 0: {
158	struct ipc_kludge tmp;
159	err = -EINVAL;
160	if (!ptr)
161	goto out;
162	err = -EFAULT;
163	if (copy_from_user(&tmp, (struct ipc_kludge __user *) ptr, sizeof (tmp)))
164	goto out;
165	err = sys_msgrcv (first, tmp.msgp, second, tmp.msgtyp, third);
166	goto out;
167	}
168	case 1: default:
169	err = sys_msgrcv (first,
170	(struct msgbuf __user *) ptr,
171	second, fifth, third);
172	goto out;
173	}
174	case MSGGET:
175	err = sys_msgget ((key_t) first, second);
176	goto out;
177	case MSGCTL:
178	err = sys_msgctl (first, second, (struct msqid_ds __user *) ptr);
179	goto out;
180	default:
181	err = -ENOSYS;
182	goto out;
183	}
184	if (call <= SHMCTL)
185	switch (call) {
186	case SHMAT:
187	switch (version) {
188	case 0: default: {
189	ulong raddr;
190	err = do_shmat (first, (char __user *) ptr, second, &raddr);
191	if (err)
192	goto out;
193	err = -EFAULT;
194	if (put_user (raddr, (ulong __user *) third))
195	goto out;
196	err = 0;
197	goto out;
198	}
199	case 1: /* iBCS2 emulator entry point */
200	err = -EINVAL;
201	goto out;
202	}
203	case SHMDT:
204	err = sys_shmdt ((char __user *)ptr);
205	goto out;
206	case SHMGET:
207	err = sys_shmget (first, second, third);
208	goto out;
209	case SHMCTL:
210	err = sys_shmctl (first, second, (struct shmid_ds __user *) ptr);
211	goto out;
212	default:
213	err = -ENOSYS;
214	goto out;
215	}
216	else
217	err = -ENOSYS;
218	out:
219	return err;
220	}
221
3a459756 KK	222	int sparc_mmap_check(unsigned long addr, unsigned long len, unsigned long flags)
	223	{
	224	if (ARCH_SUN4C_SUN4 &&
	225	(len > 0x20000000 \|\|
	226	((flags & MAP_FIXED) &&
	227	addr < 0xe0000000 && addr + len > 0x20000000)))
	228	return -EINVAL;
	229
	230	/* See asm-sparc/uaccess.h */
	231	if (len > TASK_SIZE - PAGE_SIZE \|\| addr + len > TASK_SIZE - PAGE_SIZE)
	232	return -EINVAL;
	233
	234	return 0;
	235	}
	236
1da177e4 LT	237	/* Linux version of mmap */
	238	static unsigned long do_mmap2(unsigned long addr, unsigned long len,
	239	unsigned long prot, unsigned long flags, unsigned long fd,
	240	unsigned long pgoff)
	241	{
	242	struct file * file = NULL;
	243	unsigned long retval = -EBADF;
	244
	245	if (!(flags & MAP_ANONYMOUS)) {
	246	file = fget(fd);
	247	if (!file)
	248	goto out;
	249	}
	250
1da177e4	251	len = PAGE_ALIGN(len);
1da177e4 LT	252	flags &= ~(MAP_EXECUTABLE \| MAP_DENYWRITE);
	253
	254	down_write(&current->mm->mmap_sem);
	255	retval = do_mmap_pgoff(file, addr, len, prot, flags, pgoff);
	256	up_write(&current->mm->mmap_sem);
	257
1da177e4 LT	258	if (file)
	259	fput(file);
	260	out:
	261	return retval;
	262	}
	263
	264	asmlinkage unsigned long sys_mmap2(unsigned long addr, unsigned long len,
	265	unsigned long prot, unsigned long flags, unsigned long fd,
	266	unsigned long pgoff)
	267	{
	268	/* Make sure the shift for mmap2 is constant (12), no matter what PAGE_SIZE
	269	we have. */
	270	return do_mmap2(addr, len, prot, flags, fd, pgoff >> (PAGE_SHIFT - 12));
	271	}
	272
	273	asmlinkage unsigned long sys_mmap(unsigned long addr, unsigned long len,
	274	unsigned long prot, unsigned long flags, unsigned long fd,
	275	unsigned long off)
	276	{
	277	return do_mmap2(addr, len, prot, flags, fd, off >> PAGE_SHIFT);
	278	}
	279
	280	long sparc_remap_file_pages(unsigned long start, unsigned long size,
	281	unsigned long prot, unsigned long pgoff,
	282	unsigned long flags)
	283	{
	284	/* This works on an existing mmap so we don't need to validate
	285	* the range as that was done at the original mmap call.
	286	*/
	287	return sys_remap_file_pages(start, size, prot,
	288	(pgoff >> (PAGE_SHIFT - 12)), flags);
	289	}
	290
	291	extern unsigned long do_mremap(unsigned long addr,
	292	unsigned long old_len, unsigned long new_len,
	293	unsigned long flags, unsigned long new_addr);
	294
	295	asmlinkage unsigned long sparc_mremap(unsigned long addr,
	296	unsigned long old_len, unsigned long new_len,
	297	unsigned long flags, unsigned long new_addr)
	298	{
	299	struct vm_area_struct *vma;
	300	unsigned long ret = -EINVAL;
	301	if (ARCH_SUN4C_SUN4) {
	302	if (old_len > 0x20000000 \|\| new_len > 0x20000000)
	303	goto out;
	304	if (addr < 0xe0000000 && addr + old_len > 0x20000000)
	305	goto out;
	306	}
	307	if (old_len > TASK_SIZE - PAGE_SIZE \|\|
	308	new_len > TASK_SIZE - PAGE_SIZE)
	309	goto out;
	310	down_write(&current->mm->mmap_sem);
	311	if (flags & MREMAP_FIXED) {
	312	if (ARCH_SUN4C_SUN4 &&
	313	new_addr < 0xe0000000 &&
	314	new_addr + new_len > 0x20000000)
	315	goto out_sem;
	316	if (new_addr + new_len > TASK_SIZE - PAGE_SIZE)
	317	goto out_sem;
	318	} else if ((ARCH_SUN4C_SUN4 && addr < 0xe0000000 &&
	319	addr + new_len > 0x20000000) \|\|
	320	addr + new_len > TASK_SIZE - PAGE_SIZE) {
	321	unsigned long map_flags = 0;
322	struct file *file = NULL;
323
324	ret = -ENOMEM;
325	if (!(flags & MREMAP_MAYMOVE))
326	goto out_sem;
327
328	vma = find_vma(current->mm, addr);
329	if (vma) {
330	if (vma->vm_flags & VM_SHARED)
331	map_flags \|= MAP_SHARED;
332	file = vma->vm_file;
333	}
334
335	new_addr = get_unmapped_area(file, addr, new_len,
336	vma ? vma->vm_pgoff : 0,
337	map_flags);
338	ret = new_addr;
339	if (new_addr & ~PAGE_MASK)
340	goto out_sem;
341	flags \|= MREMAP_FIXED;
342	}
343	ret = do_mremap(addr, old_len, new_len, flags, new_addr);
344	out_sem:
345	up_write(&current->mm->mmap_sem);
346	out:
347	return ret;
348	}
349
350	/* we come to here via sys_nis_syscall so it can setup the regs argument */
351	asmlinkage unsigned long
352	c_sys_nis_syscall (struct pt_regs *regs)
353	{
354	static int count = 0;
355
356	if (count++ > 5)
357	return -ENOSYS;
358	printk ("%s[%d]: Unimplemented SPARC system call %d\n",
19c5870c	359	current->comm, task_pid_nr(current), (int)regs->u_regs[1]);
1da177e4 LT	360	#ifdef DEBUG_UNIMP_SYSCALL
	361	show_regs (regs);
	362	#endif
	363	return -ENOSYS;
	364	}
	365
	366	/* #define DEBUG_SPARC_BREAKPOINT */
	367
	368	asmlinkage void
	369	sparc_breakpoint (struct pt_regs *regs)
	370	{
	371	siginfo_t info;
	372
	373	lock_kernel();
	374	#ifdef DEBUG_SPARC_BREAKPOINT
	375	printk ("TRAP: Entering kernel PC=%x, nPC=%x\n", regs->pc, regs->npc);
	376	#endif
	377	info.si_signo = SIGTRAP;
	378	info.si_errno = 0;
	379	info.si_code = TRAP_BRKPT;
	380	info.si_addr = (void __user *)regs->pc;
	381	info.si_trapno = 0;
	382	force_sig_info(SIGTRAP, &info, current);
	383
	384	#ifdef DEBUG_SPARC_BREAKPOINT
	385	printk ("TRAP: Returning to space: PC=%x nPC=%x\n", regs->pc, regs->npc);
	386	#endif
	387	unlock_kernel();
	388	}
	389
	390	asmlinkage int
	391	sparc_sigaction (int sig, const struct old_sigaction __user *act,
	392	struct old_sigaction __user *oact)
	393	{
	394	struct k_sigaction new_ka, old_ka;
	395	int ret;
	396
5526b7e4 DM	397	WARN_ON_ONCE(sig >= 0);
5526b7e4 DM	398	sig = -sig;
1da177e4 LT	399
	400	if (act) {
	401	unsigned long mask;
	402
	403	if (!access_ok(VERIFY_READ, act, sizeof(*act)) \|\|
	404	__get_user(new_ka.sa.sa_handler, &act->sa_handler) \|\|
	405	__get_user(new_ka.sa.sa_restorer, &act->sa_restorer))
	406	return -EFAULT;
	407	__get_user(new_ka.sa.sa_flags, &act->sa_flags);
	408	__get_user(mask, &act->sa_mask);
	409	siginitset(&new_ka.sa.sa_mask, mask);
	410	new_ka.ka_restorer = NULL;
	411	}
	412
	413	ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);
	414
	415	if (!ret && oact) {
	416	/* In the clone() case we could copy half consistent
	417	* state to the user, however this could sleep and
	418	* deadlock us if we held the signal lock on SMP. So for
	419	* now I take the easy way out and do no locking.
	420	*/
	421	if (!access_ok(VERIFY_WRITE, oact, sizeof(*oact)) \|\|
	422	__put_user(old_ka.sa.sa_handler, &oact->sa_handler) \|\|
	423	__put_user(old_ka.sa.sa_restorer, &oact->sa_restorer))
	424	return -EFAULT;
	425	__put_user(old_ka.sa.sa_flags, &oact->sa_flags);
	426	__put_user(old_ka.sa.sa_mask.sig[0], &oact->sa_mask);
	427	}
	428
	429	return ret;
	430	}
	431
	432	asmlinkage long
	433	sys_rt_sigaction(int sig,
	434	const struct sigaction __user *act,
	435	struct sigaction __user *oact,
	436	void __user *restorer,
	437	size_t sigsetsize)
	438	{
	439	struct k_sigaction new_ka, old_ka;
	440	int ret;
	441
	442	/* XXX: Don't preclude handling different sized sigset_t's. */
	443	if (sigsetsize != sizeof(sigset_t))
	444	return -EINVAL;
	445
1da177e4 LT	446	if (act) {
	447	new_ka.ka_restorer = restorer;
	448	if (copy_from_user(&new_ka.sa, act, sizeof(*act)))
	449	return -EFAULT;
	450	}
	451
	452	ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);
	453
	454	if (!ret && oact) {
	455	if (copy_to_user(oact, &old_ka.sa, sizeof(*oact)))
	456	return -EFAULT;
	457	}
	458
	459	return ret;
	460	}
	461
	462	asmlinkage int sys_getdomainname(char __user *name, int len)
	463	{
8310a32c	464	int nlen, err;
1da177e4	465
b9c54f91	466	if (len < 0)
8310a32c DM	467	return -EINVAL;
8310a32c DM	468
1da177e4 LT	469	down_read(&uts_sem);
1da177e4 LT	470
e9ff3990	471	nlen = strlen(utsname()->domainname) + 1;
b9c54f91 AW	472	err = -EINVAL;
	473	if (nlen > len)
	474	goto out;
8310a32c DM	475
8310a32c DM	476	err = -EFAULT;
e9ff3990	477	if (!copy_to_user(name, utsname()->domainname, nlen))
8310a32c DM	478	err = 0;
8310a32c DM	479
b9c54f91	480	out:
1da177e4 LT	481	up_read(&uts_sem);
	482	return err;
	483	}
fe74290d AB	484
	485	/*
	486	* Do a system call from kernel instead of calling sys_execve so we
	487	* end up with proper pt_regs.
	488	*/
	489	int kernel_execve(const char filename, char const argv[], char *const envp[])
	490	{
	491	long __res;
	492	register long __g1 __asm__ ("g1") = __NR_execve;
	493	register long __o0 __asm__ ("o0") = (long)(filename);
	494	register long __o1 __asm__ ("o1") = (long)(argv);
	495	register long __o2 __asm__ ("o2") = (long)(envp);
	496	asm volatile ("t 0x10\n\t"
	497	"bcc 1f\n\t"
	498	"mov %%o0, %0\n\t"
	499	"sub %%g0, %%o0, %0\n\t"
	500	"1:\n\t"
	501	: "=r" (__res), "=&r" (__o0)
	502	: "1" (__o0), "r" (__o1), "r" (__o2), "r" (__g1)
	503	: "cc");
	504	return __res;
	505	}