[deliverable/linux.git] / arch / sparc / kernel / sys_sparc_64.c

/* linux/arch/sparc64/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/fs.h>
#include <linux/file.h>
#include <linux/mm.h>
#include <linux/sem.h>
#include <linux/msg.h>
#include <linux/shm.h>
#include <linux/stat.h>
#include <linux/mman.h>
#include <linux/utsname.h>
#include <linux/smp.h>
#include <linux/slab.h>
#include <linux/syscalls.h>
#include <linux/ipc.h>
#include <linux/personality.h>
#include <linux/random.h>
#include <linux/export.h>
#include <linux/context_tracking.h>

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

#include "entry.h"
#include "systbls.h"

/* #define DEBUG_UNIMP_SYSCALL */

asmlinkage unsigned long sys_getpagesize(void)
{
	return PAGE_SIZE;
}

/* Does addr --> addr+len fall within 4GB of the VA-space hole or
 * overflow past the end of the 64-bit address space?
 */
static inline int invalid_64bit_range(unsigned long addr, unsigned long len)
{
	unsigned long va_exclude_start, va_exclude_end;

	va_exclude_start = VA_EXCLUDE_START;
	va_exclude_end   = VA_EXCLUDE_END;

	if (unlikely(len >= va_exclude_start))
		return 1;

	if (unlikely((addr + len) < addr))
		return 1;

	if (unlikely((addr >= va_exclude_start && addr < va_exclude_end) ||
		     ((addr + len) >= va_exclude_start &&
		      (addr + len) < va_exclude_end)))
		return 1;

	return 0;
}

/* These functions differ from the default implementations in
 * mm/mmap.c in two ways:
 *
 * 1) For file backed MAP_SHARED mmap()'s we D-cache color align,
 *    for fixed such mappings we just validate what the user gave us.
 * 2) For 64-bit tasks we avoid mapping anything within 4GB of
 *    the spitfire/niagara VA-hole.
 */

static inline unsigned long COLOR_ALIGN(unsigned long addr,
					 unsigned long pgoff)
{
	unsigned long base = (addr+SHMLBA-1)&~(SHMLBA-1);
	unsigned long off = (pgoff<<PAGE_SHIFT) & (SHMLBA-1);

	return base + off;
}

unsigned long arch_get_unmapped_area(struct file *filp, unsigned long addr, unsigned long len, unsigned long pgoff, unsigned long flags)
{
	struct mm_struct *mm = current->mm;
	struct vm_area_struct * vma;
	unsigned long task_size = TASK_SIZE;
	int do_color_align;
	struct vm_unmapped_area_info info;

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

	if (test_thread_flag(TIF_32BIT))
		task_size = STACK_TOP32;
	if (unlikely(len > task_size || len >= VA_EXCLUDE_START))
		return -ENOMEM;

	do_color_align = 0;
	if (filp || (flags & MAP_SHARED))
		do_color_align = 1;

	if (addr) {
		if (do_color_align)
			addr = COLOR_ALIGN(addr, pgoff);
		else
			addr = PAGE_ALIGN(addr);

		vma = find_vma(mm, addr);
		if (task_size - len >= addr &&
		    (!vma || addr + len <= vma->vm_start))
			return addr;
	}

	info.flags = 0;
	info.length = len;
	info.low_limit = TASK_UNMAPPED_BASE;
	info.high_limit = min(task_size, VA_EXCLUDE_START);
	info.align_mask = do_color_align ? (PAGE_MASK & (SHMLBA - 1)) : 0;
	info.align_offset = pgoff << PAGE_SHIFT;
	addr = vm_unmapped_area(&info);

	if ((addr & ~PAGE_MASK) && task_size > VA_EXCLUDE_END) {
		VM_BUG_ON(addr != -ENOMEM);
		info.low_limit = VA_EXCLUDE_END;
		info.high_limit = task_size;
		addr = vm_unmapped_area(&info);
	}

	return addr;
}

unsigned long
arch_get_unmapped_area_topdown(struct file *filp, const unsigned long addr0,
			  const unsigned long len, const unsigned long pgoff,
			  const unsigned long flags)
{
	struct vm_area_struct *vma;
	struct mm_struct *mm = current->mm;
	unsigned long task_size = STACK_TOP32;
	unsigned long addr = addr0;
	int do_color_align;
	struct vm_unmapped_area_info info;

	/* This should only ever run for 32-bit processes.  */
	BUG_ON(!test_thread_flag(TIF_32BIT));

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

	if (unlikely(len > task_size))
		return -ENOMEM;

	do_color_align = 0;
	if (filp || (flags & MAP_SHARED))
		do_color_align = 1;

	/* requesting a specific address */
	if (addr) {
		if (do_color_align)
			addr = COLOR_ALIGN(addr, pgoff);
		else
			addr = PAGE_ALIGN(addr);

		vma = find_vma(mm, addr);
		if (task_size - len >= addr &&
		    (!vma || addr + len <= vma->vm_start))
			return addr;
	}

	info.flags = VM_UNMAPPED_AREA_TOPDOWN;
	info.length = len;
	info.low_limit = PAGE_SIZE;
	info.high_limit = mm->mmap_base;
	info.align_mask = do_color_align ? (PAGE_MASK & (SHMLBA - 1)) : 0;
	info.align_offset = pgoff << PAGE_SHIFT;
	addr = vm_unmapped_area(&info);

	/*
	 * A failed mmap() very likely causes application failure,
	 * so fall back to the bottom-up function here. This scenario
	 * can happen with large stack limits and large mmap()
	 * allocations.
	 */
	if (addr & ~PAGE_MASK) {
		VM_BUG_ON(addr != -ENOMEM);
		info.flags = 0;
		info.low_limit = TASK_UNMAPPED_BASE;
		info.high_limit = STACK_TOP32;
		addr = vm_unmapped_area(&info);
	}

	return addr;
}

/* Try to align mapping such that we align it as much as possible. */
unsigned long get_fb_unmapped_area(struct file *filp, unsigned long orig_addr, unsigned long len, unsigned long pgoff, unsigned long flags)
{
	unsigned long align_goal, addr = -ENOMEM;
	unsigned long (*get_area)(struct file *, unsigned long,
				  unsigned long, unsigned long, unsigned long);

	get_area = current->mm->get_unmapped_area;

	if (flags & MAP_FIXED) {
		/* Ok, don't mess with it. */
		return get_area(NULL, orig_addr, len, pgoff, flags);
	}
	flags &= ~MAP_SHARED;

	align_goal = PAGE_SIZE;
	if (len >= (4UL * 1024 * 1024))
		align_goal = (4UL * 1024 * 1024);
	else if (len >= (512UL * 1024))
		align_goal = (512UL * 1024);
	else if (len >= (64UL * 1024))
		align_goal = (64UL * 1024);

	do {
		addr = get_area(NULL, orig_addr, len + (align_goal - PAGE_SIZE), pgoff, flags);
		if (!(addr & ~PAGE_MASK)) {
			addr = (addr + (align_goal - 1UL)) & ~(align_goal - 1UL);
			break;
		}

		if (align_goal == (4UL * 1024 * 1024))
			align_goal = (512UL * 1024);
		else if (align_goal == (512UL * 1024))
			align_goal = (64UL * 1024);
		else
			align_goal = PAGE_SIZE;
	} while ((addr & ~PAGE_MASK) && align_goal > PAGE_SIZE);

	/* Mapping is smaller than 64K or larger areas could not
	 * be obtained.
	 */
	if (addr & ~PAGE_MASK)
		addr = get_area(NULL, orig_addr, len, pgoff, flags);

	return addr;
}
EXPORT_SYMBOL(get_fb_unmapped_area);

/* Essentially the same as PowerPC.  */
static unsigned long mmap_rnd(void)
{
	unsigned long rnd = 0UL;

	if (current->flags & PF_RANDOMIZE) {
		unsigned long val = get_random_int();
		if (test_thread_flag(TIF_32BIT))
			rnd = (val % (1UL << (23UL-PAGE_SHIFT)));
		else
			rnd = (val % (1UL << (30UL-PAGE_SHIFT)));
	}
	return rnd << PAGE_SHIFT;
}

void arch_pick_mmap_layout(struct mm_struct *mm)
{
	unsigned long random_factor = mmap_rnd();
	unsigned long gap;

	/*
	 * Fall back to the standard layout if the personality
	 * bit is set, or if the expected stack growth is unlimited:
	 */
	gap = rlimit(RLIMIT_STACK);
	if (!test_thread_flag(TIF_32BIT) ||
	    (current->personality & ADDR_COMPAT_LAYOUT) ||
	    gap == RLIM_INFINITY ||
	    sysctl_legacy_va_layout) {
		mm->mmap_base = TASK_UNMAPPED_BASE + random_factor;
		mm->get_unmapped_area = arch_get_unmapped_area;
	} else {
		/* We know it's 32-bit */
		unsigned long task_size = STACK_TOP32;

		if (gap < 128 * 1024 * 1024)
			gap = 128 * 1024 * 1024;
		if (gap > (task_size / 6 * 5))
			gap = (task_size / 6 * 5);

		mm->mmap_base = PAGE_ALIGN(task_size - gap - random_factor);
		mm->get_unmapped_area = arch_get_unmapped_area_topdown;
	}
}

/*
 * sys_pipe() is the normal C calling standard for creating
 * a pipe. It's not the way unix traditionally does this, though.
 */
SYSCALL_DEFINE1(sparc_pipe_real, 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.
 */

SYSCALL_DEFINE6(sparc_ipc, unsigned int, call, int, first, unsigned long, second,
		unsigned long, third, void __user *, ptr, long, fifth)
{
	long err;

	/* No need for backward compatibility. We can start fresh... */
	if (call <= SEMCTL) {
		switch (call) {
		case SEMOP:
			err = sys_semtimedop(first, ptr,
					     (unsigned)second, NULL);
			goto out;
		case SEMTIMEDOP:
			err = sys_semtimedop(first, ptr, (unsigned)second,
				(const struct timespec __user *)
					     (unsigned long) fifth);
			goto out;
		case SEMGET:
			err = sys_semget(first, (int)second, (int)third);
			goto out;
		case SEMCTL: {
			err = sys_semctl(first, second,
					 (int)third | IPC_64,
					 (unsigned long) ptr);
			goto out;
		}
		default:
			err = -ENOSYS;
			goto out;
		}
	}
	if (call <= MSGCTL) {
		switch (call) {
		case MSGSND:
			err = sys_msgsnd(first, ptr, (size_t)second,
					 (int)third);
			goto out;
		case MSGRCV:
			err = sys_msgrcv(first, ptr, (size_t)second, fifth,
					 (int)third);
			goto out;
		case MSGGET:
			err = sys_msgget((key_t)first, (int)second);
			goto out;
		case MSGCTL:
			err = sys_msgctl(first, (int)second | IPC_64, ptr);
			goto out;
		default:
			err = -ENOSYS;
			goto out;
		}
	}
	if (call <= SHMCTL) {
		switch (call) {
		case SHMAT: {
			ulong raddr;
			err = do_shmat(first, ptr, (int)second, &raddr, SHMLBA);
			if (!err) {
				if (put_user(raddr,
					     (ulong __user *) third))
					err = -EFAULT;
			}
			goto out;
		}
		case SHMDT:
			err = sys_shmdt(ptr);
			goto out;
		case SHMGET:
			err = sys_shmget(first, (size_t)second, (int)third);
			goto out;
		case SHMCTL:
			err = sys_shmctl(first, (int)second | IPC_64, ptr);
			goto out;
		default:
			err = -ENOSYS;
			goto out;
		}
	} else {
		err = -ENOSYS;
	}
out:
	return err;
}

SYSCALL_DEFINE1(sparc64_personality, unsigned long, personality)
{
	int ret;

	if (personality(current->personality) == PER_LINUX32 &&
	    personality(personality) == PER_LINUX)
		personality |= PER_LINUX32;
	ret = sys_personality(personality);
	if (personality(ret) == PER_LINUX32)
		ret &= ~PER_LINUX32;

	return ret;
}

int sparc_mmap_check(unsigned long addr, unsigned long len)
{
	if (test_thread_flag(TIF_32BIT)) {
		if (len >= STACK_TOP32)
			return -EINVAL;

		if (addr > STACK_TOP32 - len)
			return -EINVAL;
	} else {
		if (len >= VA_EXCLUDE_START)
			return -EINVAL;

		if (invalid_64bit_range(addr, len))
			return -EINVAL;
	}

	return 0;
}

/* Linux version of mmap */
SYSCALL_DEFINE6(mmap, unsigned long, addr, unsigned long, len,
		unsigned long, prot, unsigned long, flags, unsigned long, fd,
		unsigned long, off)
{
	unsigned long retval = -EINVAL;

	if ((off + PAGE_ALIGN(len)) < off)
		goto out;
	if (off & ~PAGE_MASK)
		goto out;
	retval = sys_mmap_pgoff(addr, len, prot, flags, fd, off >> PAGE_SHIFT);
out:
	return retval;
}

SYSCALL_DEFINE2(64_munmap, unsigned long, addr, size_t, len)
{
	if (invalid_64bit_range(addr, len))
		return -EINVAL;

	return vm_munmap(addr, len);
}
                
SYSCALL_DEFINE5(64_mremap, unsigned long, addr,	unsigned long, old_len,
		unsigned long, new_len, unsigned long, flags,
		unsigned long, new_addr)
{
	if (test_thread_flag(TIF_32BIT))
		return -EINVAL;
	return sys_mremap(addr, old_len, new_len, flags, new_addr);
}

/* 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;
	
	/* Don't make the system unusable, if someone goes stuck */
	if (count++ > 5)
		return -ENOSYS;

	printk ("Unimplemented SPARC system call %ld\n",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)
{
	enum ctx_state prev_state = exception_enter();
	siginfo_t info;

	if (test_thread_flag(TIF_32BIT)) {
		regs->tpc &= 0xffffffff;
		regs->tnpc &= 0xffffffff;
	}
#ifdef DEBUG_SPARC_BREAKPOINT
        printk ("TRAP: Entering kernel PC=%lx, nPC=%lx\n", regs->tpc, regs->tnpc);
#endif
	info.si_signo = SIGTRAP;
	info.si_errno = 0;
	info.si_code = TRAP_BRKPT;
	info.si_addr = (void __user *)regs->tpc;
	info.si_trapno = 0;
	force_sig_info(SIGTRAP, &info, current);
#ifdef DEBUG_SPARC_BREAKPOINT
	printk ("TRAP: Returning to space: PC=%lx nPC=%lx\n", regs->tpc, regs->tnpc);
#endif
	exception_exit(prev_state);
}

extern void check_pending(int signum);

SYSCALL_DEFINE2(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;
}

SYSCALL_DEFINE5(utrap_install, utrap_entry_t, type,
		utrap_handler_t, new_p, utrap_handler_t, new_d,
		utrap_handler_t __user *, old_p,
		utrap_handler_t __user *, old_d)
{
	if (type < UT_INSTRUCTION_EXCEPTION || type > UT_TRAP_INSTRUCTION_31)
		return -EINVAL;
	if (new_p == (utrap_handler_t)(long)UTH_NOCHANGE) {
		if (old_p) {
			if (!current_thread_info()->utraps) {
				if (put_user(NULL, old_p))
					return -EFAULT;
			} else {
				if (put_user((utrap_handler_t)(current_thread_info()->utraps[type]), old_p))
					return -EFAULT;
			}
		}
		if (old_d) {
			if (put_user(NULL, old_d))
				return -EFAULT;
		}
		return 0;
	}
	if (!current_thread_info()->utraps) {
		current_thread_info()->utraps =
			kzalloc((UT_TRAP_INSTRUCTION_31+1)*sizeof(long), GFP_KERNEL);
		if (!current_thread_info()->utraps)
			return -ENOMEM;
		current_thread_info()->utraps[0] = 1;
	} else {
		if ((utrap_handler_t)current_thread_info()->utraps[type] != new_p &&
		    current_thread_info()->utraps[0] > 1) {
			unsigned long *p = current_thread_info()->utraps;

			current_thread_info()->utraps =
				kmalloc((UT_TRAP_INSTRUCTION_31+1)*sizeof(long),
					GFP_KERNEL);
			if (!current_thread_info()->utraps) {
				current_thread_info()->utraps = p;
				return -ENOMEM;
			}
			p[0]--;
			current_thread_info()->utraps[0] = 1;
			memcpy(current_thread_info()->utraps+1, p+1,
			       UT_TRAP_INSTRUCTION_31*sizeof(long));
		}
	}
	if (old_p) {
		if (put_user((utrap_handler_t)(current_thread_info()->utraps[type]), old_p))
			return -EFAULT;
	}
	if (old_d) {
		if (put_user(NULL, old_d))
			return -EFAULT;
	}
	current_thread_info()->utraps[type] = (long)new_p;

	return 0;
}

asmlinkage long sparc_memory_ordering(unsigned long model,
				      struct pt_regs *regs)
{
	if (model >= 3)
		return -EINVAL;
	regs->tstate = (regs->tstate & ~TSTATE_MM) | (model << 14);
	return 0;
}

SYSCALL_DEFINE5(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 long sys_kern_features(void)
{
	return KERN_FEATURE_MIXED_MODE_STACK;
}
Commit	Line	Data
207ddd0a	1	/* linux/arch/sparc64/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
1da177e4 LT	8	#include <linux/errno.h>
	9	#include <linux/types.h>
	10	#include <linux/sched.h>
	11	#include <linux/fs.h>
	12	#include <linux/file.h>
	13	#include <linux/mm.h>
	14	#include <linux/sem.h>
	15	#include <linux/msg.h>
	16	#include <linux/shm.h>
	17	#include <linux/stat.h>
	18	#include <linux/mman.h>
	19	#include <linux/utsname.h>
	20	#include <linux/smp.h>
1da177e4 LT	21	#include <linux/slab.h>
	22	#include <linux/syscalls.h>
	23	#include <linux/ipc.h>
	24	#include <linux/personality.h>
05f9ca83	25	#include <linux/random.h>
066bcaca	26	#include <linux/export.h>
812cb83a	27	#include <linux/context_tracking.h>
1da177e4 LT	28
1da177e4 LT	29	#include <asm/uaccess.h>
1da177e4	30	#include <asm/utrap.h>
fe74290d	31	#include <asm/unistd.h>
1da177e4	32
207ddd0a DM	33	#include "entry.h"
	34	#include "systbls.h"
	35
1da177e4 LT	36	/* #define DEBUG_UNIMP_SYSCALL */
1da177e4 LT	37
1da177e4 LT	38	asmlinkage unsigned long sys_getpagesize(void)
	39	{
	40	return PAGE_SIZE;
	41	}
	42
8bcd1741 DM	43	/* Does addr --> addr+len fall within 4GB of the VA-space hole or
	44	* overflow past the end of the 64-bit address space?
	45	*/
	46	static inline int invalid_64bit_range(unsigned long addr, unsigned long len)
	47	{
	48	unsigned long va_exclude_start, va_exclude_end;
	49
	50	va_exclude_start = VA_EXCLUDE_START;
	51	va_exclude_end = VA_EXCLUDE_END;
	52
	53	if (unlikely(len >= va_exclude_start))
	54	return 1;
	55
	56	if (unlikely((addr + len) < addr))
	57	return 1;
	58
	59	if (unlikely((addr >= va_exclude_start && addr < va_exclude_end) \|\|
	60	((addr + len) >= va_exclude_start &&
	61	(addr + len) < va_exclude_end)))
	62	return 1;
	63
	64	return 0;
	65	}
	66
a91690dd DM	67	/* These functions differ from the default implementations in
	68	* mm/mmap.c in two ways:
	69	*
	70	* 1) For file backed MAP_SHARED mmap()'s we D-cache color align,
	71	* for fixed such mappings we just validate what the user gave us.
	72	* 2) For 64-bit tasks we avoid mapping anything within 4GB of
	73	* the spitfire/niagara VA-hole.
	74	*/
	75
748ba883	76	static inline unsigned long COLOR_ALIGN(unsigned long addr,
a91690dd DM	77	unsigned long pgoff)
	78	{
	79	unsigned long base = (addr+SHMLBA-1)&~(SHMLBA-1);
	80	unsigned long off = (pgoff<<PAGE_SHIFT) & (SHMLBA-1);
	81
	82	return base + off;
	83	}
	84
1da177e4 LT	85	unsigned long arch_get_unmapped_area(struct file *filp, unsigned long addr, unsigned long len, unsigned long pgoff, unsigned long flags)
	86	{
	87	struct mm_struct *mm = current->mm;
	88	struct vm_area_struct * vma;
	89	unsigned long task_size = TASK_SIZE;
1da177e4	90	int do_color_align;
bb64f550	91	struct vm_unmapped_area_info info;
1da177e4 LT	92
	93	if (flags & MAP_FIXED) {
	94	/* We do not accept a shared mapping if it would violate
	95	* cache aliasing constraints.
	96	*/
	97	if ((flags & MAP_SHARED) &&
	98	((addr - (pgoff << PAGE_SHIFT)) & (SHMLBA - 1)))
	99	return -EINVAL;
	100	return addr;
	101	}
	102
	103	if (test_thread_flag(TIF_32BIT))
d61e16df	104	task_size = STACK_TOP32;
a91690dd	105	if (unlikely(len > task_size \|\| len >= VA_EXCLUDE_START))
1da177e4 LT	106	return -ENOMEM;
	107
	108	do_color_align = 0;
	109	if (filp \|\| (flags & MAP_SHARED))
	110	do_color_align = 1;
	111
	112	if (addr) {
	113	if (do_color_align)
748ba883	114	addr = COLOR_ALIGN(addr, pgoff);
1da177e4 LT	115	else
	116	addr = PAGE_ALIGN(addr);
	117
	118	vma = find_vma(mm, addr);
	119	if (task_size - len >= addr &&
	120	(!vma \|\| addr + len <= vma->vm_start))
	121	return addr;
	122	}
	123
bb64f550 ML	124	info.flags = 0;
	125	info.length = len;
	126	info.low_limit = TASK_UNMAPPED_BASE;
	127	info.high_limit = min(task_size, VA_EXCLUDE_START);
	128	info.align_mask = do_color_align ? (PAGE_MASK & (SHMLBA - 1)) : 0;
	129	info.align_offset = pgoff << PAGE_SHIFT;
	130	addr = vm_unmapped_area(&info);
	131
	132	if ((addr & ~PAGE_MASK) && task_size > VA_EXCLUDE_END) {
	133	VM_BUG_ON(addr != -ENOMEM);
	134	info.low_limit = VA_EXCLUDE_END;
	135	info.high_limit = task_size;
	136	addr = vm_unmapped_area(&info);
1363c3cd	137	}
1da177e4	138
bb64f550	139	return addr;
1da177e4 LT	140	}
1da177e4 LT	141
a91690dd DM	142	unsigned long
	143	arch_get_unmapped_area_topdown(struct file *filp, const unsigned long addr0,
	144	const unsigned long len, const unsigned long pgoff,
	145	const unsigned long flags)
	146	{
	147	struct vm_area_struct *vma;
	148	struct mm_struct *mm = current->mm;
d61e16df	149	unsigned long task_size = STACK_TOP32;
a91690dd DM	150	unsigned long addr = addr0;
a91690dd DM	151	int do_color_align;
bb64f550	152	struct vm_unmapped_area_info info;
a91690dd DM	153
	154	/* This should only ever run for 32-bit processes. */
	155	BUG_ON(!test_thread_flag(TIF_32BIT));
	156
	157	if (flags & MAP_FIXED) {
	158	/* We do not accept a shared mapping if it would violate
	159	* cache aliasing constraints.
	160	*/
	161	if ((flags & MAP_SHARED) &&
	162	((addr - (pgoff << PAGE_SHIFT)) & (SHMLBA - 1)))
	163	return -EINVAL;
	164	return addr;
	165	}
	166
	167	if (unlikely(len > task_size))
	168	return -ENOMEM;
	169
	170	do_color_align = 0;
	171	if (filp \|\| (flags & MAP_SHARED))
	172	do_color_align = 1;
	173
	174	/* requesting a specific address */
	175	if (addr) {
	176	if (do_color_align)
748ba883	177	addr = COLOR_ALIGN(addr, pgoff);
a91690dd DM	178	else
	179	addr = PAGE_ALIGN(addr);
	180
	181	vma = find_vma(mm, addr);
	182	if (task_size - len >= addr &&
	183	(!vma \|\| addr + len <= vma->vm_start))
	184	return addr;
	185	}
	186
bb64f550 ML	187	info.flags = VM_UNMAPPED_AREA_TOPDOWN;
	188	info.length = len;
	189	info.low_limit = PAGE_SIZE;
	190	info.high_limit = mm->mmap_base;
	191	info.align_mask = do_color_align ? (PAGE_MASK & (SHMLBA - 1)) : 0;
	192	info.align_offset = pgoff << PAGE_SHIFT;
	193	addr = vm_unmapped_area(&info);
a91690dd	194
a91690dd DM	195	/*
	196	* A failed mmap() very likely causes application failure,
	197	* so fall back to the bottom-up function here. This scenario
	198	* can happen with large stack limits and large mmap()
	199	* allocations.
	200	*/
bb64f550 ML	201	if (addr & ~PAGE_MASK) {
	202	VM_BUG_ON(addr != -ENOMEM);
	203	info.flags = 0;
	204	info.low_limit = TASK_UNMAPPED_BASE;
	205	info.high_limit = STACK_TOP32;
	206	addr = vm_unmapped_area(&info);
	207	}
a91690dd DM	208
	209	return addr;
	210	}
	211
1da177e4 LT	212	/* Try to align mapping such that we align it as much as possible. */
	213	unsigned long get_fb_unmapped_area(struct file *filp, unsigned long orig_addr, unsigned long len, unsigned long pgoff, unsigned long flags)
	214	{
	215	unsigned long align_goal, addr = -ENOMEM;
c4caa778 AV	216	unsigned long (get_area)(struct file , unsigned long,
	217	unsigned long, unsigned long, unsigned long);
	218
	219	get_area = current->mm->get_unmapped_area;
1da177e4 LT	220
	221	if (flags & MAP_FIXED) {
	222	/* Ok, don't mess with it. */
c4caa778	223	return get_area(NULL, orig_addr, len, pgoff, flags);
1da177e4 LT	224	}
	225	flags &= ~MAP_SHARED;
	226
	227	align_goal = PAGE_SIZE;
	228	if (len >= (4UL * 1024 * 1024))
	229	align_goal = (4UL * 1024 * 1024);
	230	else if (len >= (512UL * 1024))
	231	align_goal = (512UL * 1024);
	232	else if (len >= (64UL * 1024))
	233	align_goal = (64UL * 1024);
	234
	235	do {
c4caa778	236	addr = get_area(NULL, orig_addr, len + (align_goal - PAGE_SIZE), pgoff, flags);
1da177e4 LT	237	if (!(addr & ~PAGE_MASK)) {
	238	addr = (addr + (align_goal - 1UL)) & ~(align_goal - 1UL);
	239	break;
	240	}
	241
	242	if (align_goal == (4UL * 1024 * 1024))
	243	align_goal = (512UL * 1024);
	244	else if (align_goal == (512UL * 1024))
	245	align_goal = (64UL * 1024);
	246	else
	247	align_goal = PAGE_SIZE;
	248	} while ((addr & ~PAGE_MASK) && align_goal > PAGE_SIZE);
	249
	250	/* Mapping is smaller than 64K or larger areas could not
	251	* be obtained.
	252	*/
	253	if (addr & ~PAGE_MASK)
c4caa778	254	addr = get_area(NULL, orig_addr, len, pgoff, flags);
1da177e4 LT	255
	256	return addr;
	257	}
917c3660	258	EXPORT_SYMBOL(get_fb_unmapped_area);
1da177e4	259
5a0efea0 DM	260	/* Essentially the same as PowerPC. */
5a0efea0 DM	261	static unsigned long mmap_rnd(void)
a91690dd	262	{
5a0efea0	263	unsigned long rnd = 0UL;
05f9ca83 DM	264
05f9ca83 DM	265	if (current->flags & PF_RANDOMIZE) {
5a0efea0	266	unsigned long val = get_random_int();
05f9ca83	267	if (test_thread_flag(TIF_32BIT))
fa8cbaaf	268	rnd = (val % (1UL << (23UL-PAGE_SHIFT)));
05f9ca83	269	else
fa8cbaaf	270	rnd = (val % (1UL << (30UL-PAGE_SHIFT)));
05f9ca83	271	}
fa8cbaaf	272	return rnd << PAGE_SHIFT;
5a0efea0 DM	273	}
	274
	275	void arch_pick_mmap_layout(struct mm_struct *mm)
	276	{
	277	unsigned long random_factor = mmap_rnd();
	278	unsigned long gap;
05f9ca83	279
a91690dd DM	280	/*
	281	* Fall back to the standard layout if the personality
	282	* bit is set, or if the expected stack growth is unlimited:
	283	*/
76704fb5	284	gap = rlimit(RLIMIT_STACK);
a91690dd DM	285	if (!test_thread_flag(TIF_32BIT) \|\|
a91690dd DM	286	(current->personality & ADDR_COMPAT_LAYOUT) \|\|
76704fb5	287	gap == RLIM_INFINITY \|\|
a91690dd	288	sysctl_legacy_va_layout) {
05f9ca83	289	mm->mmap_base = TASK_UNMAPPED_BASE + random_factor;
a91690dd	290	mm->get_unmapped_area = arch_get_unmapped_area;
a91690dd DM	291	} else {
a91690dd DM	292	/* We know it's 32-bit */
d61e16df	293	unsigned long task_size = STACK_TOP32;
a91690dd	294
a91690dd DM	295	if (gap < 128 * 1024 * 1024)
	296	gap = 128 * 1024 * 1024;
	297	if (gap > (task_size / 6 * 5))
	298	gap = (task_size / 6 * 5);
	299
05f9ca83	300	mm->mmap_base = PAGE_ALIGN(task_size - gap - random_factor);
a91690dd	301	mm->get_unmapped_area = arch_get_unmapped_area_topdown;
a91690dd DM	302	}
	303	}
	304
1da177e4 LT	305	/*
	306	* sys_pipe() is the normal C calling standard for creating
	307	* a pipe. It's not the way unix traditionally does this, though.
	308	*/
e4265019	309	SYSCALL_DEFINE1(sparc_pipe_real, struct pt_regs *, regs)
1da177e4 LT	310	{
	311	int fd[2];
	312	int error;
	313
ed8cae8b	314	error = do_pipe_flags(fd, 0);
1da177e4 LT	315	if (error)
	316	goto out;
	317	regs->u_regs[UREG_I1] = fd[1];
	318	error = fd[0];
	319	out:
	320	return error;
	321	}
	322
	323	/*
	324	* sys_ipc() is the de-multiplexer for the SysV IPC calls..
	325	*
	326	* This is really horribly ugly.
	327	*/
	328
baed7fc9	329	SYSCALL_DEFINE6(sparc_ipc, unsigned int, call, int, first, unsigned long, second,
e4265019	330	unsigned long, third, void __user *, ptr, long, fifth)
1da177e4	331	{
7379b42b	332	long err;
1da177e4 LT	333
	334	/* No need for backward compatibility. We can start fresh... */
	335	if (call <= SEMCTL) {
	336	switch (call) {
	337	case SEMOP:
	338	err = sys_semtimedop(first, ptr,
	339	(unsigned)second, NULL);
	340	goto out;
	341	case SEMTIMEDOP:
	342	err = sys_semtimedop(first, ptr, (unsigned)second,
207ddd0a DM	343	(const struct timespec __user *)
207ddd0a DM	344	(unsigned long) fifth);
1da177e4 LT	345	goto out;
	346	case SEMGET:
	347	err = sys_semget(first, (int)second, (int)third);
	348	goto out;
	349	case SEMCTL: {
020cfb05 DM	350	err = sys_semctl(first, second,
020cfb05 DM	351	(int)third \| IPC_64,
e1fd1f49	352	(unsigned long) ptr);
1da177e4 LT	353	goto out;
	354	}
	355	default:
	356	err = -ENOSYS;
	357	goto out;
6cb79b3f	358	}
1da177e4 LT	359	}
	360	if (call <= MSGCTL) {
	361	switch (call) {
	362	case MSGSND:
	363	err = sys_msgsnd(first, ptr, (size_t)second,
	364	(int)third);
	365	goto out;
	366	case MSGRCV:
	367	err = sys_msgrcv(first, ptr, (size_t)second, fifth,
	368	(int)third);
	369	goto out;
	370	case MSGGET:
	371	err = sys_msgget((key_t)first, (int)second);
	372	goto out;
	373	case MSGCTL:
	374	err = sys_msgctl(first, (int)second \| IPC_64, ptr);
	375	goto out;
	376	default:
	377	err = -ENOSYS;
	378	goto out;
6cb79b3f	379	}
1da177e4 LT	380	}
	381	if (call <= SHMCTL) {
	382	switch (call) {
	383	case SHMAT: {
	384	ulong raddr;
079a96ae	385	err = do_shmat(first, ptr, (int)second, &raddr, SHMLBA);
1da177e4 LT	386	if (!err) {
	387	if (put_user(raddr,
	388	(ulong __user *) third))
	389	err = -EFAULT;
	390	}
	391	goto out;
	392	}
	393	case SHMDT:
	394	err = sys_shmdt(ptr);
	395	goto out;
	396	case SHMGET:
	397	err = sys_shmget(first, (size_t)second, (int)third);
	398	goto out;
	399	case SHMCTL:
	400	err = sys_shmctl(first, (int)second \| IPC_64, ptr);
	401	goto out;
	402	default:
	403	err = -ENOSYS;
	404	goto out;
6cb79b3f	405	}
1da177e4 LT	406	} else {
	407	err = -ENOSYS;
	408	}
	409	out:
	410	return err;
	411	}
	412
e4265019	413	SYSCALL_DEFINE1(sparc64_personality, unsigned long, personality)
1da177e4 LT	414	{
	415	int ret;
	416
a27032ee JK	417	if (personality(current->personality) == PER_LINUX32 &&
	418	personality(personality) == PER_LINUX)
	419	personality \|= PER_LINUX32;
1da177e4	420	ret = sys_personality(personality);
a27032ee JK	421	if (personality(ret) == PER_LINUX32)
a27032ee JK	422	ret &= ~PER_LINUX32;
1da177e4 LT	423
	424	return ret;
	425	}
	426
f92ffa12	427	int sparc_mmap_check(unsigned long addr, unsigned long len)
3a459756 KK	428	{
	429	if (test_thread_flag(TIF_32BIT)) {
	430	if (len >= STACK_TOP32)
	431	return -EINVAL;
	432
58163393	433	if (addr > STACK_TOP32 - len)
3a459756 KK	434	return -EINVAL;
	435	} else {
	436	if (len >= VA_EXCLUDE_START)
	437	return -EINVAL;
	438
58163393	439	if (invalid_64bit_range(addr, len))
3a459756 KK	440	return -EINVAL;
	441	}
	442
	443	return 0;
	444	}
	445
1da177e4	446	/* Linux version of mmap */
e4265019 DM	447	SYSCALL_DEFINE6(mmap, unsigned long, addr, unsigned long, len,
	448	unsigned long, prot, unsigned long, flags, unsigned long, fd,
	449	unsigned long, off)
1da177e4	450	{
f8b72560	451	unsigned long retval = -EINVAL;
1da177e4	452
f8b72560 AV	453	if ((off + PAGE_ALIGN(len)) < off)
	454	goto out;
	455	if (off & ~PAGE_MASK)
	456	goto out;
	457	retval = sys_mmap_pgoff(addr, len, prot, flags, fd, off >> PAGE_SHIFT);
1da177e4 LT	458	out:
	459	return retval;
	460	}
	461
e4265019	462	SYSCALL_DEFINE2(64_munmap, unsigned long, addr, size_t, len)
1da177e4	463	{
8bcd1741	464	if (invalid_64bit_range(addr, len))
1da177e4	465	return -EINVAL;
8bcd1741	466
bfce281c	467	return vm_munmap(addr, len);
1da177e4	468	}
1da177e4	469
e4265019 DM	470	SYSCALL_DEFINE5(64_mremap, unsigned long, addr, unsigned long, old_len,
	471	unsigned long, new_len, unsigned long, flags,
	472	unsigned long, new_addr)
1da177e4	473	{
1da177e4	474	if (test_thread_flag(TIF_32BIT))
657bec85 AV	475	return -EINVAL;
657bec85 AV	476	return sys_mremap(addr, old_len, new_len, flags, new_addr);
1da177e4 LT	477	}
	478
	479	/* we come to here via sys_nis_syscall so it can setup the regs argument */
	480	asmlinkage unsigned long c_sys_nis_syscall(struct pt_regs *regs)
	481	{
	482	static int count;
	483
	484	/* Don't make the system unusable, if someone goes stuck */
	485	if (count++ > 5)
	486	return -ENOSYS;
	487
	488	printk ("Unimplemented SPARC system call %ld\n",regs->u_regs[1]);
	489	#ifdef DEBUG_UNIMP_SYSCALL
	490	show_regs (regs);
	491	#endif
	492
	493	return -ENOSYS;
	494	}
	495
	496	/* #define DEBUG_SPARC_BREAKPOINT */
	497
	498	asmlinkage void sparc_breakpoint(struct pt_regs *regs)
	499	{
812cb83a	500	enum ctx_state prev_state = exception_enter();
1da177e4 LT	501	siginfo_t info;
	502
	503	if (test_thread_flag(TIF_32BIT)) {
	504	regs->tpc &= 0xffffffff;
	505	regs->tnpc &= 0xffffffff;
	506	}
	507	#ifdef DEBUG_SPARC_BREAKPOINT
	508	printk ("TRAP: Entering kernel PC=%lx, nPC=%lx\n", regs->tpc, regs->tnpc);
	509	#endif
	510	info.si_signo = SIGTRAP;
	511	info.si_errno = 0;
	512	info.si_code = TRAP_BRKPT;
	513	info.si_addr = (void __user *)regs->tpc;
	514	info.si_trapno = 0;
	515	force_sig_info(SIGTRAP, &info, current);
	516	#ifdef DEBUG_SPARC_BREAKPOINT
	517	printk ("TRAP: Returning to space: PC=%lx nPC=%lx\n", regs->tpc, regs->tnpc);
	518	#endif
812cb83a	519	exception_exit(prev_state);
1da177e4 LT	520	}
	521
	522	extern void check_pending(int signum);
	523
e4265019	524	SYSCALL_DEFINE2(getdomainname, char __user *, name, int, len)
1da177e4	525	{
8310a32c DM	526	int nlen, err;
8310a32c DM	527
b9c54f91	528	if (len < 0)
8310a32c	529	return -EINVAL;
1da177e4 LT	530
	531	down_read(&uts_sem);
	532
e9ff3990	533	nlen = strlen(utsname()->domainname) + 1;
b9c54f91 AW	534	err = -EINVAL;
	535	if (nlen > len)
	536	goto out;
8310a32c DM	537
8310a32c DM	538	err = -EFAULT;
e9ff3990	539	if (!copy_to_user(name, utsname()->domainname, nlen))
8310a32c DM	540	err = 0;
8310a32c DM	541
b9c54f91	542	out:
1da177e4 LT	543	up_read(&uts_sem);
	544	return err;
	545	}
	546
e4265019 DM	547	SYSCALL_DEFINE5(utrap_install, utrap_entry_t, type,
	548	utrap_handler_t, new_p, utrap_handler_t, new_d,
	549	utrap_handler_t __user *, old_p,
	550	utrap_handler_t __user *, old_d)
1da177e4 LT	551	{
	552	if (type < UT_INSTRUCTION_EXCEPTION \|\| type > UT_TRAP_INSTRUCTION_31)
	553	return -EINVAL;
	554	if (new_p == (utrap_handler_t)(long)UTH_NOCHANGE) {
	555	if (old_p) {
	556	if (!current_thread_info()->utraps) {
	557	if (put_user(NULL, old_p))
	558	return -EFAULT;
	559	} else {
	560	if (put_user((utrap_handler_t)(current_thread_info()->utraps[type]), old_p))
	561	return -EFAULT;
	562	}
	563	}
	564	if (old_d) {
	565	if (put_user(NULL, old_d))
	566	return -EFAULT;
	567	}
	568	return 0;
	569	}
	570	if (!current_thread_info()->utraps) {
	571	current_thread_info()->utraps =
9132983a	572	kzalloc((UT_TRAP_INSTRUCTION_31+1)*sizeof(long), GFP_KERNEL);
1da177e4 LT	573	if (!current_thread_info()->utraps)
	574	return -ENOMEM;
	575	current_thread_info()->utraps[0] = 1;
1da177e4 LT	576	} else {
	577	if ((utrap_handler_t)current_thread_info()->utraps[type] != new_p &&
	578	current_thread_info()->utraps[0] > 1) {
207ddd0a	579	unsigned long *p = current_thread_info()->utraps;
1da177e4 LT	580
	581	current_thread_info()->utraps =
	582	kmalloc((UT_TRAP_INSTRUCTION_31+1)*sizeof(long),
	583	GFP_KERNEL);
	584	if (!current_thread_info()->utraps) {
	585	current_thread_info()->utraps = p;
	586	return -ENOMEM;
	587	}
	588	p[0]--;
	589	current_thread_info()->utraps[0] = 1;
	590	memcpy(current_thread_info()->utraps+1, p+1,
	591	UT_TRAP_INSTRUCTION_31*sizeof(long));
	592	}
	593	}
	594	if (old_p) {
	595	if (put_user((utrap_handler_t)(current_thread_info()->utraps[type]), old_p))
	596	return -EFAULT;
	597	}
	598	if (old_d) {
	599	if (put_user(NULL, old_d))
	600	return -EFAULT;
	601	}
	602	current_thread_info()->utraps[type] = (long)new_p;
	603
	604	return 0;
	605	}
	606
207ddd0a DM	607	asmlinkage long sparc_memory_ordering(unsigned long model,
207ddd0a DM	608	struct pt_regs *regs)
1da177e4 LT	609	{
	610	if (model >= 3)
	611	return -EINVAL;
	612	regs->tstate = (regs->tstate & ~TSTATE_MM) \| (model << 14);
	613	return 0;
	614	}
	615
e4265019 DM	616	SYSCALL_DEFINE5(rt_sigaction, int, sig, const struct sigaction __user *, act,
	617	struct sigaction __user , oact, void __user , restorer,
	618	size_t, sigsetsize)
1da177e4 LT	619	{
	620	struct k_sigaction new_ka, old_ka;
	621	int ret;
	622
	623	/* XXX: Don't preclude handling different sized sigset_t's. */
	624	if (sigsetsize != sizeof(sigset_t))
	625	return -EINVAL;
	626
	627	if (act) {
	628	new_ka.ka_restorer = restorer;
	629	if (copy_from_user(&new_ka.sa, act, sizeof(*act)))
	630	return -EFAULT;
	631	}
	632
	633	ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);
	634
	635	if (!ret && oact) {
	636	if (copy_to_user(oact, &old_ka.sa, sizeof(*oact)))
	637	return -EFAULT;
	638	}
	639
	640	return ret;
	641	}
	642
517ffce4 DM	643	asmlinkage long sys_kern_features(void)
	644	{
	645	return KERN_FEATURE_MIXED_MODE_STACK;
	646	}