[mirror_ubuntu-zesty-kernel.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 "kernel.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_long();
		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 <= SEMTIMEDOP) {
		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)
{
	long 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	33	#include "entry.h"
8df52620	34	#include "kernel.h"
207ddd0a DM	35	#include "systbls.h"
207ddd0a DM	36
1da177e4 LT	37	/* #define DEBUG_UNIMP_SYSCALL */
1da177e4 LT	38
1da177e4 LT	39	asmlinkage unsigned long sys_getpagesize(void)
	40	{
	41	return PAGE_SIZE;
	42	}
	43
8bcd1741 DM	44	/* Does addr --> addr+len fall within 4GB of the VA-space hole or
	45	* overflow past the end of the 64-bit address space?
	46	*/
	47	static inline int invalid_64bit_range(unsigned long addr, unsigned long len)
	48	{
	49	unsigned long va_exclude_start, va_exclude_end;
	50
	51	va_exclude_start = VA_EXCLUDE_START;
	52	va_exclude_end = VA_EXCLUDE_END;
	53
	54	if (unlikely(len >= va_exclude_start))
	55	return 1;
	56
	57	if (unlikely((addr + len) < addr))
	58	return 1;
	59
	60	if (unlikely((addr >= va_exclude_start && addr < va_exclude_end) \|\|
	61	((addr + len) >= va_exclude_start &&
	62	(addr + len) < va_exclude_end)))
	63	return 1;
	64
	65	return 0;
	66	}
	67
a91690dd DM	68	/* These functions differ from the default implementations in
	69	* mm/mmap.c in two ways:
	70	*
	71	* 1) For file backed MAP_SHARED mmap()'s we D-cache color align,
	72	* for fixed such mappings we just validate what the user gave us.
	73	* 2) For 64-bit tasks we avoid mapping anything within 4GB of
	74	* the spitfire/niagara VA-hole.
	75	*/
	76
748ba883	77	static inline unsigned long COLOR_ALIGN(unsigned long addr,
a91690dd DM	78	unsigned long pgoff)
	79	{
	80	unsigned long base = (addr+SHMLBA-1)&~(SHMLBA-1);
	81	unsigned long off = (pgoff<<PAGE_SHIFT) & (SHMLBA-1);
	82
	83	return base + off;
	84	}
	85
1da177e4 LT	86	unsigned long arch_get_unmapped_area(struct file *filp, unsigned long addr, unsigned long len, unsigned long pgoff, unsigned long flags)
	87	{
	88	struct mm_struct *mm = current->mm;
	89	struct vm_area_struct * vma;
	90	unsigned long task_size = TASK_SIZE;
1da177e4	91	int do_color_align;
bb64f550	92	struct vm_unmapped_area_info info;
1da177e4 LT	93
	94	if (flags & MAP_FIXED) {
	95	/* We do not accept a shared mapping if it would violate
	96	* cache aliasing constraints.
	97	*/
	98	if ((flags & MAP_SHARED) &&
	99	((addr - (pgoff << PAGE_SHIFT)) & (SHMLBA - 1)))
	100	return -EINVAL;
	101	return addr;
	102	}
	103
	104	if (test_thread_flag(TIF_32BIT))
d61e16df	105	task_size = STACK_TOP32;
a91690dd	106	if (unlikely(len > task_size \|\| len >= VA_EXCLUDE_START))
1da177e4 LT	107	return -ENOMEM;
	108
	109	do_color_align = 0;
	110	if (filp \|\| (flags & MAP_SHARED))
	111	do_color_align = 1;
	112
	113	if (addr) {
	114	if (do_color_align)
748ba883	115	addr = COLOR_ALIGN(addr, pgoff);
1da177e4 LT	116	else
	117	addr = PAGE_ALIGN(addr);
	118
	119	vma = find_vma(mm, addr);
	120	if (task_size - len >= addr &&
	121	(!vma \|\| addr + len <= vma->vm_start))
	122	return addr;
	123	}
	124
bb64f550 ML	125	info.flags = 0;
	126	info.length = len;
	127	info.low_limit = TASK_UNMAPPED_BASE;
	128	info.high_limit = min(task_size, VA_EXCLUDE_START);
	129	info.align_mask = do_color_align ? (PAGE_MASK & (SHMLBA - 1)) : 0;
	130	info.align_offset = pgoff << PAGE_SHIFT;
	131	addr = vm_unmapped_area(&info);
	132
	133	if ((addr & ~PAGE_MASK) && task_size > VA_EXCLUDE_END) {
	134	VM_BUG_ON(addr != -ENOMEM);
	135	info.low_limit = VA_EXCLUDE_END;
	136	info.high_limit = task_size;
	137	addr = vm_unmapped_area(&info);
1363c3cd	138	}
1da177e4	139
bb64f550	140	return addr;
1da177e4 LT	141	}
1da177e4 LT	142
a91690dd DM	143	unsigned long
	144	arch_get_unmapped_area_topdown(struct file *filp, const unsigned long addr0,
	145	const unsigned long len, const unsigned long pgoff,
	146	const unsigned long flags)
	147	{
	148	struct vm_area_struct *vma;
	149	struct mm_struct *mm = current->mm;
d61e16df	150	unsigned long task_size = STACK_TOP32;
a91690dd DM	151	unsigned long addr = addr0;
a91690dd DM	152	int do_color_align;
bb64f550	153	struct vm_unmapped_area_info info;
a91690dd DM	154
	155	/* This should only ever run for 32-bit processes. */
	156	BUG_ON(!test_thread_flag(TIF_32BIT));
	157
	158	if (flags & MAP_FIXED) {
	159	/* We do not accept a shared mapping if it would violate
	160	* cache aliasing constraints.
	161	*/
	162	if ((flags & MAP_SHARED) &&
	163	((addr - (pgoff << PAGE_SHIFT)) & (SHMLBA - 1)))
	164	return -EINVAL;
	165	return addr;
	166	}
	167
	168	if (unlikely(len > task_size))
	169	return -ENOMEM;
	170
	171	do_color_align = 0;
	172	if (filp \|\| (flags & MAP_SHARED))
	173	do_color_align = 1;
	174
	175	/* requesting a specific address */
	176	if (addr) {
	177	if (do_color_align)
748ba883	178	addr = COLOR_ALIGN(addr, pgoff);
a91690dd DM	179	else
	180	addr = PAGE_ALIGN(addr);
	181
	182	vma = find_vma(mm, addr);
	183	if (task_size - len >= addr &&
	184	(!vma \|\| addr + len <= vma->vm_start))
	185	return addr;
	186	}
	187
bb64f550 ML	188	info.flags = VM_UNMAPPED_AREA_TOPDOWN;
	189	info.length = len;
	190	info.low_limit = PAGE_SIZE;
	191	info.high_limit = mm->mmap_base;
	192	info.align_mask = do_color_align ? (PAGE_MASK & (SHMLBA - 1)) : 0;
	193	info.align_offset = pgoff << PAGE_SHIFT;
	194	addr = vm_unmapped_area(&info);
a91690dd	195
a91690dd DM	196	/*
	197	* A failed mmap() very likely causes application failure,
	198	* so fall back to the bottom-up function here. This scenario
	199	* can happen with large stack limits and large mmap()
	200	* allocations.
	201	*/
bb64f550 ML	202	if (addr & ~PAGE_MASK) {
	203	VM_BUG_ON(addr != -ENOMEM);
	204	info.flags = 0;
	205	info.low_limit = TASK_UNMAPPED_BASE;
	206	info.high_limit = STACK_TOP32;
	207	addr = vm_unmapped_area(&info);
	208	}
a91690dd DM	209
	210	return addr;
	211	}
	212
1da177e4 LT	213	/* Try to align mapping such that we align it as much as possible. */
	214	unsigned long get_fb_unmapped_area(struct file *filp, unsigned long orig_addr, unsigned long len, unsigned long pgoff, unsigned long flags)
	215	{
	216	unsigned long align_goal, addr = -ENOMEM;
c4caa778 AV	217	unsigned long (get_area)(struct file , unsigned long,
	218	unsigned long, unsigned long, unsigned long);
	219
	220	get_area = current->mm->get_unmapped_area;
1da177e4 LT	221
	222	if (flags & MAP_FIXED) {
	223	/* Ok, don't mess with it. */
c4caa778	224	return get_area(NULL, orig_addr, len, pgoff, flags);
1da177e4 LT	225	}
	226	flags &= ~MAP_SHARED;
	227
	228	align_goal = PAGE_SIZE;
	229	if (len >= (4UL * 1024 * 1024))
	230	align_goal = (4UL * 1024 * 1024);
	231	else if (len >= (512UL * 1024))
	232	align_goal = (512UL * 1024);
	233	else if (len >= (64UL * 1024))
	234	align_goal = (64UL * 1024);
	235
	236	do {
c4caa778	237	addr = get_area(NULL, orig_addr, len + (align_goal - PAGE_SIZE), pgoff, flags);
1da177e4 LT	238	if (!(addr & ~PAGE_MASK)) {
	239	addr = (addr + (align_goal - 1UL)) & ~(align_goal - 1UL);
	240	break;
	241	}
	242
	243	if (align_goal == (4UL * 1024 * 1024))
	244	align_goal = (512UL * 1024);
	245	else if (align_goal == (512UL * 1024))
	246	align_goal = (64UL * 1024);
	247	else
	248	align_goal = PAGE_SIZE;
	249	} while ((addr & ~PAGE_MASK) && align_goal > PAGE_SIZE);
	250
	251	/* Mapping is smaller than 64K or larger areas could not
	252	* be obtained.
	253	*/
	254	if (addr & ~PAGE_MASK)
c4caa778	255	addr = get_area(NULL, orig_addr, len, pgoff, flags);
1da177e4 LT	256
	257	return addr;
	258	}
917c3660	259	EXPORT_SYMBOL(get_fb_unmapped_area);
1da177e4	260
5a0efea0 DM	261	/* Essentially the same as PowerPC. */
5a0efea0 DM	262	static unsigned long mmap_rnd(void)
a91690dd	263	{
5a0efea0	264	unsigned long rnd = 0UL;
05f9ca83 DM	265
05f9ca83 DM	266	if (current->flags & PF_RANDOMIZE) {
5ef11c35	267	unsigned long val = get_random_long();
05f9ca83	268	if (test_thread_flag(TIF_32BIT))
fa8cbaaf	269	rnd = (val % (1UL << (23UL-PAGE_SHIFT)));
05f9ca83	270	else
fa8cbaaf	271	rnd = (val % (1UL << (30UL-PAGE_SHIFT)));
05f9ca83	272	}
fa8cbaaf	273	return rnd << PAGE_SHIFT;
5a0efea0 DM	274	}
	275
	276	void arch_pick_mmap_layout(struct mm_struct *mm)
	277	{
	278	unsigned long random_factor = mmap_rnd();
	279	unsigned long gap;
05f9ca83	280
a91690dd DM	281	/*
	282	* Fall back to the standard layout if the personality
	283	* bit is set, or if the expected stack growth is unlimited:
	284	*/
76704fb5	285	gap = rlimit(RLIMIT_STACK);
a91690dd DM	286	if (!test_thread_flag(TIF_32BIT) \|\|
a91690dd DM	287	(current->personality & ADDR_COMPAT_LAYOUT) \|\|
76704fb5	288	gap == RLIM_INFINITY \|\|
a91690dd	289	sysctl_legacy_va_layout) {
05f9ca83	290	mm->mmap_base = TASK_UNMAPPED_BASE + random_factor;
a91690dd	291	mm->get_unmapped_area = arch_get_unmapped_area;
a91690dd DM	292	} else {
a91690dd DM	293	/* We know it's 32-bit */
d61e16df	294	unsigned long task_size = STACK_TOP32;
a91690dd	295
a91690dd DM	296	if (gap < 128 * 1024 * 1024)
	297	gap = 128 * 1024 * 1024;
	298	if (gap > (task_size / 6 * 5))
	299	gap = (task_size / 6 * 5);
	300
05f9ca83	301	mm->mmap_base = PAGE_ALIGN(task_size - gap - random_factor);
a91690dd	302	mm->get_unmapped_area = arch_get_unmapped_area_topdown;
a91690dd DM	303	}
	304	}
	305
1da177e4 LT	306	/*
	307	* sys_pipe() is the normal C calling standard for creating
	308	* a pipe. It's not the way unix traditionally does this, though.
	309	*/
e4265019	310	SYSCALL_DEFINE1(sparc_pipe_real, struct pt_regs *, regs)
1da177e4 LT	311	{
	312	int fd[2];
	313	int error;
	314
ed8cae8b	315	error = do_pipe_flags(fd, 0);
1da177e4 LT	316	if (error)
	317	goto out;
	318	regs->u_regs[UREG_I1] = fd[1];
	319	error = fd[0];
	320	out:
	321	return error;
	322	}
	323
	324	/*
	325	* sys_ipc() is the de-multiplexer for the SysV IPC calls..
	326	*
	327	* This is really horribly ugly.
	328	*/
	329
baed7fc9	330	SYSCALL_DEFINE6(sparc_ipc, unsigned int, call, int, first, unsigned long, second,
e4265019	331	unsigned long, third, void __user *, ptr, long, fifth)
1da177e4	332	{
7379b42b	333	long err;
1da177e4 LT	334
1da177e4 LT	335	/* No need for backward compatibility. We can start fresh... */
53eb2516	336	if (call <= SEMTIMEDOP) {
1da177e4 LT	337	switch (call) {
	338	case SEMOP:
	339	err = sys_semtimedop(first, ptr,
	340	(unsigned)second, NULL);
	341	goto out;
	342	case SEMTIMEDOP:
	343	err = sys_semtimedop(first, ptr, (unsigned)second,
207ddd0a DM	344	(const struct timespec __user *)
207ddd0a DM	345	(unsigned long) fifth);
1da177e4 LT	346	goto out;
	347	case SEMGET:
	348	err = sys_semget(first, (int)second, (int)third);
	349	goto out;
	350	case SEMCTL: {
020cfb05 DM	351	err = sys_semctl(first, second,
020cfb05 DM	352	(int)third \| IPC_64,
e1fd1f49	353	(unsigned long) ptr);
1da177e4 LT	354	goto out;
	355	}
	356	default:
	357	err = -ENOSYS;
	358	goto out;
6cb79b3f	359	}
1da177e4 LT	360	}
	361	if (call <= MSGCTL) {
	362	switch (call) {
	363	case MSGSND:
	364	err = sys_msgsnd(first, ptr, (size_t)second,
	365	(int)third);
	366	goto out;
	367	case MSGRCV:
	368	err = sys_msgrcv(first, ptr, (size_t)second, fifth,
	369	(int)third);
	370	goto out;
	371	case MSGGET:
	372	err = sys_msgget((key_t)first, (int)second);
	373	goto out;
	374	case MSGCTL:
	375	err = sys_msgctl(first, (int)second \| IPC_64, ptr);
	376	goto out;
	377	default:
	378	err = -ENOSYS;
	379	goto out;
6cb79b3f	380	}
1da177e4 LT	381	}
	382	if (call <= SHMCTL) {
	383	switch (call) {
	384	case SHMAT: {
	385	ulong raddr;
079a96ae	386	err = do_shmat(first, ptr, (int)second, &raddr, SHMLBA);
1da177e4 LT	387	if (!err) {
	388	if (put_user(raddr,
	389	(ulong __user *) third))
	390	err = -EFAULT;
	391	}
	392	goto out;
	393	}
	394	case SHMDT:
	395	err = sys_shmdt(ptr);
	396	goto out;
	397	case SHMGET:
	398	err = sys_shmget(first, (size_t)second, (int)third);
	399	goto out;
	400	case SHMCTL:
	401	err = sys_shmctl(first, (int)second \| IPC_64, ptr);
	402	goto out;
	403	default:
	404	err = -ENOSYS;
	405	goto out;
6cb79b3f	406	}
1da177e4 LT	407	} else {
	408	err = -ENOSYS;
	409	}
	410	out:
	411	return err;
	412	}
	413
e4265019	414	SYSCALL_DEFINE1(sparc64_personality, unsigned long, personality)
1da177e4	415	{
525fd5a9	416	long ret;
1da177e4	417
a27032ee JK	418	if (personality(current->personality) == PER_LINUX32 &&
	419	personality(personality) == PER_LINUX)
	420	personality \|= PER_LINUX32;
1da177e4	421	ret = sys_personality(personality);
a27032ee JK	422	if (personality(ret) == PER_LINUX32)
a27032ee JK	423	ret &= ~PER_LINUX32;
1da177e4 LT	424
	425	return ret;
	426	}
	427
f92ffa12	428	int sparc_mmap_check(unsigned long addr, unsigned long len)
3a459756 KK	429	{
	430	if (test_thread_flag(TIF_32BIT)) {
	431	if (len >= STACK_TOP32)
	432	return -EINVAL;
	433
58163393	434	if (addr > STACK_TOP32 - len)
3a459756 KK	435	return -EINVAL;
	436	} else {
	437	if (len >= VA_EXCLUDE_START)
	438	return -EINVAL;
	439
58163393	440	if (invalid_64bit_range(addr, len))
3a459756 KK	441	return -EINVAL;
	442	}
	443
	444	return 0;
	445	}
	446
1da177e4	447	/* Linux version of mmap */
e4265019 DM	448	SYSCALL_DEFINE6(mmap, unsigned long, addr, unsigned long, len,
	449	unsigned long, prot, unsigned long, flags, unsigned long, fd,
	450	unsigned long, off)
1da177e4	451	{
f8b72560	452	unsigned long retval = -EINVAL;
1da177e4	453
f8b72560 AV	454	if ((off + PAGE_ALIGN(len)) < off)
	455	goto out;
	456	if (off & ~PAGE_MASK)
	457	goto out;
	458	retval = sys_mmap_pgoff(addr, len, prot, flags, fd, off >> PAGE_SHIFT);
1da177e4 LT	459	out:
	460	return retval;
	461	}
	462
e4265019	463	SYSCALL_DEFINE2(64_munmap, unsigned long, addr, size_t, len)
1da177e4	464	{
8bcd1741	465	if (invalid_64bit_range(addr, len))
1da177e4	466	return -EINVAL;
8bcd1741	467
bfce281c	468	return vm_munmap(addr, len);
1da177e4	469	}
1da177e4	470
e4265019 DM	471	SYSCALL_DEFINE5(64_mremap, unsigned long, addr, unsigned long, old_len,
	472	unsigned long, new_len, unsigned long, flags,
	473	unsigned long, new_addr)
1da177e4	474	{
1da177e4	475	if (test_thread_flag(TIF_32BIT))
657bec85 AV	476	return -EINVAL;
657bec85 AV	477	return sys_mremap(addr, old_len, new_len, flags, new_addr);
1da177e4 LT	478	}
	479
	480	/* we come to here via sys_nis_syscall so it can setup the regs argument */
	481	asmlinkage unsigned long c_sys_nis_syscall(struct pt_regs *regs)
	482	{
	483	static int count;
	484
	485	/* Don't make the system unusable, if someone goes stuck */
	486	if (count++ > 5)
	487	return -ENOSYS;
	488
	489	printk ("Unimplemented SPARC system call %ld\n",regs->u_regs[1]);
	490	#ifdef DEBUG_UNIMP_SYSCALL
	491	show_regs (regs);
	492	#endif
	493
	494	return -ENOSYS;
	495	}
	496
	497	/* #define DEBUG_SPARC_BREAKPOINT */
	498
	499	asmlinkage void sparc_breakpoint(struct pt_regs *regs)
	500	{
812cb83a	501	enum ctx_state prev_state = exception_enter();
1da177e4 LT	502	siginfo_t info;
	503
	504	if (test_thread_flag(TIF_32BIT)) {
	505	regs->tpc &= 0xffffffff;
	506	regs->tnpc &= 0xffffffff;
	507	}
	508	#ifdef DEBUG_SPARC_BREAKPOINT
	509	printk ("TRAP: Entering kernel PC=%lx, nPC=%lx\n", regs->tpc, regs->tnpc);
	510	#endif
	511	info.si_signo = SIGTRAP;
	512	info.si_errno = 0;
	513	info.si_code = TRAP_BRKPT;
	514	info.si_addr = (void __user *)regs->tpc;
	515	info.si_trapno = 0;
	516	force_sig_info(SIGTRAP, &info, current);
	517	#ifdef DEBUG_SPARC_BREAKPOINT
	518	printk ("TRAP: Returning to space: PC=%lx nPC=%lx\n", regs->tpc, regs->tnpc);
	519	#endif
812cb83a	520	exception_exit(prev_state);
1da177e4 LT	521	}
	522
	523	extern void check_pending(int signum);
	524
e4265019	525	SYSCALL_DEFINE2(getdomainname, char __user *, name, int, len)
1da177e4	526	{
8310a32c DM	527	int nlen, err;
8310a32c DM	528
b9c54f91	529	if (len < 0)
8310a32c	530	return -EINVAL;
1da177e4 LT	531
	532	down_read(&uts_sem);
	533
e9ff3990	534	nlen = strlen(utsname()->domainname) + 1;
b9c54f91 AW	535	err = -EINVAL;
	536	if (nlen > len)
	537	goto out;
8310a32c DM	538
8310a32c DM	539	err = -EFAULT;
e9ff3990	540	if (!copy_to_user(name, utsname()->domainname, nlen))
8310a32c DM	541	err = 0;
8310a32c DM	542
b9c54f91	543	out:
1da177e4 LT	544	up_read(&uts_sem);
	545	return err;
	546	}
	547
e4265019 DM	548	SYSCALL_DEFINE5(utrap_install, utrap_entry_t, type,
	549	utrap_handler_t, new_p, utrap_handler_t, new_d,
	550	utrap_handler_t __user *, old_p,
	551	utrap_handler_t __user *, old_d)
1da177e4 LT	552	{
	553	if (type < UT_INSTRUCTION_EXCEPTION \|\| type > UT_TRAP_INSTRUCTION_31)
	554	return -EINVAL;
	555	if (new_p == (utrap_handler_t)(long)UTH_NOCHANGE) {
	556	if (old_p) {
	557	if (!current_thread_info()->utraps) {
	558	if (put_user(NULL, old_p))
	559	return -EFAULT;
	560	} else {
	561	if (put_user((utrap_handler_t)(current_thread_info()->utraps[type]), old_p))
	562	return -EFAULT;
	563	}
	564	}
	565	if (old_d) {
	566	if (put_user(NULL, old_d))
	567	return -EFAULT;
	568	}
	569	return 0;
	570	}
	571	if (!current_thread_info()->utraps) {
	572	current_thread_info()->utraps =
9132983a	573	kzalloc((UT_TRAP_INSTRUCTION_31+1)*sizeof(long), GFP_KERNEL);
1da177e4 LT	574	if (!current_thread_info()->utraps)
	575	return -ENOMEM;
	576	current_thread_info()->utraps[0] = 1;
1da177e4 LT	577	} else {
	578	if ((utrap_handler_t)current_thread_info()->utraps[type] != new_p &&
	579	current_thread_info()->utraps[0] > 1) {
207ddd0a	580	unsigned long *p = current_thread_info()->utraps;
1da177e4 LT	581
	582	current_thread_info()->utraps =
	583	kmalloc((UT_TRAP_INSTRUCTION_31+1)*sizeof(long),
	584	GFP_KERNEL);
	585	if (!current_thread_info()->utraps) {
	586	current_thread_info()->utraps = p;
	587	return -ENOMEM;
	588	}
	589	p[0]--;
	590	current_thread_info()->utraps[0] = 1;
	591	memcpy(current_thread_info()->utraps+1, p+1,
	592	UT_TRAP_INSTRUCTION_31*sizeof(long));
	593	}
	594	}
	595	if (old_p) {
	596	if (put_user((utrap_handler_t)(current_thread_info()->utraps[type]), old_p))
	597	return -EFAULT;
	598	}
	599	if (old_d) {
	600	if (put_user(NULL, old_d))
	601	return -EFAULT;
	602	}
	603	current_thread_info()->utraps[type] = (long)new_p;
	604
	605	return 0;
	606	}
	607
207ddd0a DM	608	asmlinkage long sparc_memory_ordering(unsigned long model,
207ddd0a DM	609	struct pt_regs *regs)
1da177e4 LT	610	{
	611	if (model >= 3)
	612	return -EINVAL;
	613	regs->tstate = (regs->tstate & ~TSTATE_MM) \| (model << 14);
	614	return 0;
	615	}
	616
e4265019 DM	617	SYSCALL_DEFINE5(rt_sigaction, int, sig, const struct sigaction __user *, act,
	618	struct sigaction __user , oact, void __user , restorer,
	619	size_t, sigsetsize)
1da177e4 LT	620	{
	621	struct k_sigaction new_ka, old_ka;
	622	int ret;
	623
	624	/* XXX: Don't preclude handling different sized sigset_t's. */
	625	if (sigsetsize != sizeof(sigset_t))
	626	return -EINVAL;
	627
	628	if (act) {
	629	new_ka.ka_restorer = restorer;
	630	if (copy_from_user(&new_ka.sa, act, sizeof(*act)))
	631	return -EFAULT;
	632	}
	633
	634	ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);
	635
	636	if (!ret && oact) {
	637	if (copy_to_user(oact, &old_ka.sa, sizeof(*oact)))
	638	return -EFAULT;
	639	}
	640
	641	return ret;
	642	}
	643
517ffce4 DM	644	asmlinkage long sys_kern_features(void)
	645	{
	646	return KERN_FEATURE_MIXED_MODE_STACK;
	647	}