[people/ms/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 "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;
	unsigned long offset = gr_rand_threadstack_offset(mm, filp, flags);
	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 ((filp || (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;

#ifdef CONFIG_PAX_RANDMMAP
	if (!(mm->pax_flags & MF_PAX_RANDMMAP))
#endif

	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 && check_heap_stack_gap(vma, addr, len, offset))
			return addr;
	}

	info.flags = 0;
	info.length = len;
	info.low_limit = mm->mmap_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;
	info.threadstack_offset = offset;
	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;

#ifdef CONFIG_PAX_RANDMMAP
		if (mm->pax_flags & MF_PAX_RANDMMAP)
			info.low_limit += mm->delta_mmap;
#endif

		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;
	unsigned long offset = gr_rand_threadstack_offset(mm, filp, flags);
	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 ((filp || (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;

#ifdef CONFIG_PAX_RANDMMAP
	if (!(mm->pax_flags & MF_PAX_RANDMMAP))
#endif

	/* 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 && check_heap_stack_gap(vma, addr, len, offset))
			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;
	info.threadstack_offset = offset;
	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;

#ifdef CONFIG_PAX_RANDMMAP
		if (mm->pax_flags & MF_PAX_RANDMMAP)
			info.low_limit += mm->delta_mmap;
#endif

		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(struct mm_struct *mm)
{
	unsigned long rnd = 0UL;

#ifdef CONFIG_PAX_RANDMMAP
	if (!(mm->pax_flags & MF_PAX_RANDMMAP))
#endif

	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(mm);
	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;

#ifdef CONFIG_PAX_RANDMMAP
		if (mm->pax_flags & MF_PAX_RANDMMAP)
			mm->mmap_base += mm->delta_mmap;
#endif

		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);

#ifdef CONFIG_PAX_RANDMMAP
		if (mm->pax_flags & MF_PAX_RANDMMAP)
			mm->mmap_base -= mm->delta_mmap + mm->delta_stack;
#endif

		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	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;
63d9c273	92	unsigned long offset = gr_rand_threadstack_offset(mm, filp, flags);
bb64f550	93	struct vm_unmapped_area_info info;
1da177e4 LT	94
	95	if (flags & MAP_FIXED) {
	96	/* We do not accept a shared mapping if it would violate
	97	* cache aliasing constraints.
	98	*/
63d9c273	99	if ((filp \|\| (flags & MAP_SHARED)) &&
1da177e4 LT	100	((addr - (pgoff << PAGE_SHIFT)) & (SHMLBA - 1)))
	101	return -EINVAL;
	102	return addr;
	103	}
	104
	105	if (test_thread_flag(TIF_32BIT))
d61e16df	106	task_size = STACK_TOP32;
a91690dd	107	if (unlikely(len > task_size \|\| len >= VA_EXCLUDE_START))
1da177e4 LT	108	return -ENOMEM;
	109
	110	do_color_align = 0;
	111	if (filp \|\| (flags & MAP_SHARED))
	112	do_color_align = 1;
	113
63d9c273 MT	114	#ifdef CONFIG_PAX_RANDMMAP
	115	if (!(mm->pax_flags & MF_PAX_RANDMMAP))
	116	#endif
	117
1da177e4 LT	118	if (addr) {
1da177e4 LT	119	if (do_color_align)
748ba883	120	addr = COLOR_ALIGN(addr, pgoff);
1da177e4 LT	121	else
	122	addr = PAGE_ALIGN(addr);
	123
	124	vma = find_vma(mm, addr);
63d9c273	125	if (task_size - len >= addr && check_heap_stack_gap(vma, addr, len, offset))
1da177e4 LT	126	return addr;
	127	}
	128
bb64f550 ML	129	info.flags = 0;
bb64f550 ML	130	info.length = len;
63d9c273	131	info.low_limit = mm->mmap_base;
bb64f550 ML	132	info.high_limit = min(task_size, VA_EXCLUDE_START);
	133	info.align_mask = do_color_align ? (PAGE_MASK & (SHMLBA - 1)) : 0;
	134	info.align_offset = pgoff << PAGE_SHIFT;
63d9c273	135	info.threadstack_offset = offset;
bb64f550 ML	136	addr = vm_unmapped_area(&info);
	137
	138	if ((addr & ~PAGE_MASK) && task_size > VA_EXCLUDE_END) {
	139	VM_BUG_ON(addr != -ENOMEM);
	140	info.low_limit = VA_EXCLUDE_END;
63d9c273 MT	141
	142	#ifdef CONFIG_PAX_RANDMMAP
	143	if (mm->pax_flags & MF_PAX_RANDMMAP)
	144	info.low_limit += mm->delta_mmap;
	145	#endif
	146
bb64f550 ML	147	info.high_limit = task_size;
bb64f550 ML	148	addr = vm_unmapped_area(&info);
1363c3cd	149	}
1da177e4	150
bb64f550	151	return addr;
1da177e4 LT	152	}
1da177e4 LT	153
a91690dd DM	154	unsigned long
	155	arch_get_unmapped_area_topdown(struct file *filp, const unsigned long addr0,
	156	const unsigned long len, const unsigned long pgoff,
	157	const unsigned long flags)
	158	{
	159	struct vm_area_struct *vma;
	160	struct mm_struct *mm = current->mm;
d61e16df	161	unsigned long task_size = STACK_TOP32;
a91690dd DM	162	unsigned long addr = addr0;
a91690dd DM	163	int do_color_align;
63d9c273	164	unsigned long offset = gr_rand_threadstack_offset(mm, filp, flags);
bb64f550	165	struct vm_unmapped_area_info info;
a91690dd DM	166
	167	/* This should only ever run for 32-bit processes. */
	168	BUG_ON(!test_thread_flag(TIF_32BIT));
	169
	170	if (flags & MAP_FIXED) {
	171	/* We do not accept a shared mapping if it would violate
	172	* cache aliasing constraints.
	173	*/
63d9c273	174	if ((filp \|\| (flags & MAP_SHARED)) &&
a91690dd DM	175	((addr - (pgoff << PAGE_SHIFT)) & (SHMLBA - 1)))
	176	return -EINVAL;
	177	return addr;
	178	}
	179
	180	if (unlikely(len > task_size))
	181	return -ENOMEM;
	182
	183	do_color_align = 0;
	184	if (filp \|\| (flags & MAP_SHARED))
	185	do_color_align = 1;
	186
63d9c273 MT	187	#ifdef CONFIG_PAX_RANDMMAP
	188	if (!(mm->pax_flags & MF_PAX_RANDMMAP))
	189	#endif
	190
a91690dd DM	191	/* requesting a specific address */
	192	if (addr) {
	193	if (do_color_align)
748ba883	194	addr = COLOR_ALIGN(addr, pgoff);
a91690dd DM	195	else
	196	addr = PAGE_ALIGN(addr);
	197
	198	vma = find_vma(mm, addr);
63d9c273	199	if (task_size - len >= addr && check_heap_stack_gap(vma, addr, len, offset))
a91690dd DM	200	return addr;
	201	}
	202
bb64f550 ML	203	info.flags = VM_UNMAPPED_AREA_TOPDOWN;
	204	info.length = len;
	205	info.low_limit = PAGE_SIZE;
	206	info.high_limit = mm->mmap_base;
	207	info.align_mask = do_color_align ? (PAGE_MASK & (SHMLBA - 1)) : 0;
	208	info.align_offset = pgoff << PAGE_SHIFT;
63d9c273	209	info.threadstack_offset = offset;
bb64f550	210	addr = vm_unmapped_area(&info);
a91690dd	211
a91690dd DM	212	/*
	213	* A failed mmap() very likely causes application failure,
	214	* so fall back to the bottom-up function here. This scenario
	215	* can happen with large stack limits and large mmap()
	216	* allocations.
	217	*/
bb64f550 ML	218	if (addr & ~PAGE_MASK) {
	219	VM_BUG_ON(addr != -ENOMEM);
	220	info.flags = 0;
	221	info.low_limit = TASK_UNMAPPED_BASE;
63d9c273 MT	222
	223	#ifdef CONFIG_PAX_RANDMMAP
	224	if (mm->pax_flags & MF_PAX_RANDMMAP)
	225	info.low_limit += mm->delta_mmap;
	226	#endif
	227
bb64f550 ML	228	info.high_limit = STACK_TOP32;
	229	addr = vm_unmapped_area(&info);
	230	}
a91690dd DM	231
	232	return addr;
	233	}
	234
1da177e4 LT	235	/* Try to align mapping such that we align it as much as possible. */
	236	unsigned long get_fb_unmapped_area(struct file *filp, unsigned long orig_addr, unsigned long len, unsigned long pgoff, unsigned long flags)
	237	{
	238	unsigned long align_goal, addr = -ENOMEM;
c4caa778 AV	239	unsigned long (get_area)(struct file , unsigned long,
	240	unsigned long, unsigned long, unsigned long);
	241
	242	get_area = current->mm->get_unmapped_area;
1da177e4 LT	243
	244	if (flags & MAP_FIXED) {
	245	/* Ok, don't mess with it. */
c4caa778	246	return get_area(NULL, orig_addr, len, pgoff, flags);
1da177e4 LT	247	}
	248	flags &= ~MAP_SHARED;
	249
	250	align_goal = PAGE_SIZE;
	251	if (len >= (4UL * 1024 * 1024))
	252	align_goal = (4UL * 1024 * 1024);
	253	else if (len >= (512UL * 1024))
	254	align_goal = (512UL * 1024);
	255	else if (len >= (64UL * 1024))
	256	align_goal = (64UL * 1024);
	257
	258	do {
c4caa778	259	addr = get_area(NULL, orig_addr, len + (align_goal - PAGE_SIZE), pgoff, flags);
1da177e4 LT	260	if (!(addr & ~PAGE_MASK)) {
	261	addr = (addr + (align_goal - 1UL)) & ~(align_goal - 1UL);
	262	break;
	263	}
	264
	265	if (align_goal == (4UL * 1024 * 1024))
	266	align_goal = (512UL * 1024);
	267	else if (align_goal == (512UL * 1024))
	268	align_goal = (64UL * 1024);
	269	else
	270	align_goal = PAGE_SIZE;
	271	} while ((addr & ~PAGE_MASK) && align_goal > PAGE_SIZE);
	272
	273	/* Mapping is smaller than 64K or larger areas could not
	274	* be obtained.
	275	*/
	276	if (addr & ~PAGE_MASK)
c4caa778	277	addr = get_area(NULL, orig_addr, len, pgoff, flags);
1da177e4 LT	278
	279	return addr;
	280	}
917c3660	281	EXPORT_SYMBOL(get_fb_unmapped_area);
1da177e4	282
5a0efea0	283	/* Essentially the same as PowerPC. */
63d9c273	284	static unsigned long mmap_rnd(struct mm_struct *mm)
a91690dd	285	{
5a0efea0	286	unsigned long rnd = 0UL;
05f9ca83	287
63d9c273 MT	288	#ifdef CONFIG_PAX_RANDMMAP
	289	if (!(mm->pax_flags & MF_PAX_RANDMMAP))
	290	#endif
	291
05f9ca83	292	if (current->flags & PF_RANDOMIZE) {
5a0efea0	293	unsigned long val = get_random_int();
05f9ca83	294	if (test_thread_flag(TIF_32BIT))
fa8cbaaf	295	rnd = (val % (1UL << (23UL-PAGE_SHIFT)));
05f9ca83	296	else
fa8cbaaf	297	rnd = (val % (1UL << (30UL-PAGE_SHIFT)));
05f9ca83	298	}
fa8cbaaf	299	return rnd << PAGE_SHIFT;
5a0efea0 DM	300	}
	301
	302	void arch_pick_mmap_layout(struct mm_struct *mm)
	303	{
63d9c273	304	unsigned long random_factor = mmap_rnd(mm);
5a0efea0	305	unsigned long gap;
05f9ca83	306
a91690dd DM	307	/*
	308	* Fall back to the standard layout if the personality
	309	* bit is set, or if the expected stack growth is unlimited:
	310	*/
76704fb5	311	gap = rlimit(RLIMIT_STACK);
a91690dd DM	312	if (!test_thread_flag(TIF_32BIT) \|\|
a91690dd DM	313	(current->personality & ADDR_COMPAT_LAYOUT) \|\|
76704fb5	314	gap == RLIM_INFINITY \|\|
a91690dd	315	sysctl_legacy_va_layout) {
05f9ca83	316	mm->mmap_base = TASK_UNMAPPED_BASE + random_factor;
63d9c273 MT	317
	318	#ifdef CONFIG_PAX_RANDMMAP
	319	if (mm->pax_flags & MF_PAX_RANDMMAP)
	320	mm->mmap_base += mm->delta_mmap;
	321	#endif
	322
a91690dd	323	mm->get_unmapped_area = arch_get_unmapped_area;
a91690dd DM	324	} else {
a91690dd DM	325	/* We know it's 32-bit */
d61e16df	326	unsigned long task_size = STACK_TOP32;
a91690dd	327
a91690dd DM	328	if (gap < 128 * 1024 * 1024)
	329	gap = 128 * 1024 * 1024;
	330	if (gap > (task_size / 6 * 5))
	331	gap = (task_size / 6 * 5);
	332
05f9ca83	333	mm->mmap_base = PAGE_ALIGN(task_size - gap - random_factor);
63d9c273 MT	334
	335	#ifdef CONFIG_PAX_RANDMMAP
	336	if (mm->pax_flags & MF_PAX_RANDMMAP)
	337	mm->mmap_base -= mm->delta_mmap + mm->delta_stack;
	338	#endif
	339
a91690dd	340	mm->get_unmapped_area = arch_get_unmapped_area_topdown;
a91690dd DM	341	}
	342	}
	343
1da177e4 LT	344	/*
	345	* sys_pipe() is the normal C calling standard for creating
	346	* a pipe. It's not the way unix traditionally does this, though.
	347	*/
e4265019	348	SYSCALL_DEFINE1(sparc_pipe_real, struct pt_regs *, regs)
1da177e4 LT	349	{
	350	int fd[2];
	351	int error;
	352
ed8cae8b	353	error = do_pipe_flags(fd, 0);
1da177e4 LT	354	if (error)
	355	goto out;
	356	regs->u_regs[UREG_I1] = fd[1];
	357	error = fd[0];
	358	out:
	359	return error;
	360	}
	361
	362	/*
	363	* sys_ipc() is the de-multiplexer for the SysV IPC calls..
	364	*
	365	* This is really horribly ugly.
	366	*/
	367
baed7fc9	368	SYSCALL_DEFINE6(sparc_ipc, unsigned int, call, int, first, unsigned long, second,
e4265019	369	unsigned long, third, void __user *, ptr, long, fifth)
1da177e4	370	{
7379b42b	371	long err;
1da177e4 LT	372
	373	/* No need for backward compatibility. We can start fresh... */
	374	if (call <= SEMCTL) {
	375	switch (call) {
	376	case SEMOP:
	377	err = sys_semtimedop(first, ptr,
	378	(unsigned)second, NULL);
	379	goto out;
	380	case SEMTIMEDOP:
	381	err = sys_semtimedop(first, ptr, (unsigned)second,
207ddd0a DM	382	(const struct timespec __user *)
207ddd0a DM	383	(unsigned long) fifth);
1da177e4 LT	384	goto out;
	385	case SEMGET:
	386	err = sys_semget(first, (int)second, (int)third);
	387	goto out;
	388	case SEMCTL: {
020cfb05 DM	389	err = sys_semctl(first, second,
020cfb05 DM	390	(int)third \| IPC_64,
e1fd1f49	391	(unsigned long) ptr);
1da177e4 LT	392	goto out;
	393	}
	394	default:
	395	err = -ENOSYS;
	396	goto out;
6cb79b3f	397	}
1da177e4 LT	398	}
	399	if (call <= MSGCTL) {
	400	switch (call) {
	401	case MSGSND:
	402	err = sys_msgsnd(first, ptr, (size_t)second,
	403	(int)third);
	404	goto out;
	405	case MSGRCV:
	406	err = sys_msgrcv(first, ptr, (size_t)second, fifth,
	407	(int)third);
	408	goto out;
	409	case MSGGET:
	410	err = sys_msgget((key_t)first, (int)second);
	411	goto out;
	412	case MSGCTL:
	413	err = sys_msgctl(first, (int)second \| IPC_64, ptr);
	414	goto out;
	415	default:
	416	err = -ENOSYS;
	417	goto out;
6cb79b3f	418	}
1da177e4 LT	419	}
	420	if (call <= SHMCTL) {
	421	switch (call) {
	422	case SHMAT: {
	423	ulong raddr;
079a96ae	424	err = do_shmat(first, ptr, (int)second, &raddr, SHMLBA);
1da177e4 LT	425	if (!err) {
	426	if (put_user(raddr,
	427	(ulong __user *) third))
	428	err = -EFAULT;
	429	}
	430	goto out;
	431	}
	432	case SHMDT:
	433	err = sys_shmdt(ptr);
	434	goto out;
	435	case SHMGET:
	436	err = sys_shmget(first, (size_t)second, (int)third);
	437	goto out;
	438	case SHMCTL:
	439	err = sys_shmctl(first, (int)second \| IPC_64, ptr);
	440	goto out;
	441	default:
	442	err = -ENOSYS;
	443	goto out;
6cb79b3f	444	}
1da177e4 LT	445	} else {
	446	err = -ENOSYS;
	447	}
	448	out:
	449	return err;
	450	}
	451
e4265019	452	SYSCALL_DEFINE1(sparc64_personality, unsigned long, personality)
1da177e4 LT	453	{
	454	int ret;
	455
a27032ee JK	456	if (personality(current->personality) == PER_LINUX32 &&
	457	personality(personality) == PER_LINUX)
	458	personality \|= PER_LINUX32;
1da177e4	459	ret = sys_personality(personality);
a27032ee JK	460	if (personality(ret) == PER_LINUX32)
a27032ee JK	461	ret &= ~PER_LINUX32;
1da177e4 LT	462
	463	return ret;
	464	}
	465
f92ffa12	466	int sparc_mmap_check(unsigned long addr, unsigned long len)
3a459756 KK	467	{
	468	if (test_thread_flag(TIF_32BIT)) {
	469	if (len >= STACK_TOP32)
	470	return -EINVAL;
	471
58163393	472	if (addr > STACK_TOP32 - len)
3a459756 KK	473	return -EINVAL;
	474	} else {
	475	if (len >= VA_EXCLUDE_START)
	476	return -EINVAL;
	477
58163393	478	if (invalid_64bit_range(addr, len))
3a459756 KK	479	return -EINVAL;
	480	}
	481
	482	return 0;
	483	}
	484
1da177e4	485	/* Linux version of mmap */
e4265019 DM	486	SYSCALL_DEFINE6(mmap, unsigned long, addr, unsigned long, len,
	487	unsigned long, prot, unsigned long, flags, unsigned long, fd,
	488	unsigned long, off)
1da177e4	489	{
f8b72560	490	unsigned long retval = -EINVAL;
1da177e4	491
f8b72560 AV	492	if ((off + PAGE_ALIGN(len)) < off)
	493	goto out;
	494	if (off & ~PAGE_MASK)
	495	goto out;
	496	retval = sys_mmap_pgoff(addr, len, prot, flags, fd, off >> PAGE_SHIFT);
1da177e4 LT	497	out:
	498	return retval;
	499	}
	500
e4265019	501	SYSCALL_DEFINE2(64_munmap, unsigned long, addr, size_t, len)
1da177e4	502	{
8bcd1741	503	if (invalid_64bit_range(addr, len))
1da177e4	504	return -EINVAL;
8bcd1741	505
bfce281c	506	return vm_munmap(addr, len);
1da177e4	507	}
1da177e4	508
e4265019 DM	509	SYSCALL_DEFINE5(64_mremap, unsigned long, addr, unsigned long, old_len,
	510	unsigned long, new_len, unsigned long, flags,
	511	unsigned long, new_addr)
1da177e4	512	{
1da177e4	513	if (test_thread_flag(TIF_32BIT))
657bec85 AV	514	return -EINVAL;
657bec85 AV	515	return sys_mremap(addr, old_len, new_len, flags, new_addr);
1da177e4 LT	516	}
	517
	518	/* we come to here via sys_nis_syscall so it can setup the regs argument */
	519	asmlinkage unsigned long c_sys_nis_syscall(struct pt_regs *regs)
	520	{
	521	static int count;
	522
	523	/* Don't make the system unusable, if someone goes stuck */
	524	if (count++ > 5)
	525	return -ENOSYS;
	526
	527	printk ("Unimplemented SPARC system call %ld\n",regs->u_regs[1]);
	528	#ifdef DEBUG_UNIMP_SYSCALL
	529	show_regs (regs);
	530	#endif
	531
	532	return -ENOSYS;
	533	}
	534
	535	/* #define DEBUG_SPARC_BREAKPOINT */
	536
	537	asmlinkage void sparc_breakpoint(struct pt_regs *regs)
	538	{
812cb83a	539	enum ctx_state prev_state = exception_enter();
1da177e4 LT	540	siginfo_t info;
	541
	542	if (test_thread_flag(TIF_32BIT)) {
	543	regs->tpc &= 0xffffffff;
	544	regs->tnpc &= 0xffffffff;
	545	}
	546	#ifdef DEBUG_SPARC_BREAKPOINT
	547	printk ("TRAP: Entering kernel PC=%lx, nPC=%lx\n", regs->tpc, regs->tnpc);
	548	#endif
	549	info.si_signo = SIGTRAP;
	550	info.si_errno = 0;
	551	info.si_code = TRAP_BRKPT;
	552	info.si_addr = (void __user *)regs->tpc;
	553	info.si_trapno = 0;
	554	force_sig_info(SIGTRAP, &info, current);
	555	#ifdef DEBUG_SPARC_BREAKPOINT
	556	printk ("TRAP: Returning to space: PC=%lx nPC=%lx\n", regs->tpc, regs->tnpc);
	557	#endif
812cb83a	558	exception_exit(prev_state);
1da177e4 LT	559	}
	560
	561	extern void check_pending(int signum);
	562
e4265019	563	SYSCALL_DEFINE2(getdomainname, char __user *, name, int, len)
1da177e4	564	{
8310a32c DM	565	int nlen, err;
8310a32c DM	566
b9c54f91	567	if (len < 0)
8310a32c	568	return -EINVAL;
1da177e4 LT	569
	570	down_read(&uts_sem);
	571
e9ff3990	572	nlen = strlen(utsname()->domainname) + 1;
b9c54f91 AW	573	err = -EINVAL;
	574	if (nlen > len)
	575	goto out;
8310a32c DM	576
8310a32c DM	577	err = -EFAULT;
e9ff3990	578	if (!copy_to_user(name, utsname()->domainname, nlen))
8310a32c DM	579	err = 0;
8310a32c DM	580
b9c54f91	581	out:
1da177e4 LT	582	up_read(&uts_sem);
	583	return err;
	584	}
	585
e4265019 DM	586	SYSCALL_DEFINE5(utrap_install, utrap_entry_t, type,
	587	utrap_handler_t, new_p, utrap_handler_t, new_d,
	588	utrap_handler_t __user *, old_p,
	589	utrap_handler_t __user *, old_d)
1da177e4 LT	590	{
	591	if (type < UT_INSTRUCTION_EXCEPTION \|\| type > UT_TRAP_INSTRUCTION_31)
	592	return -EINVAL;
	593	if (new_p == (utrap_handler_t)(long)UTH_NOCHANGE) {
	594	if (old_p) {
	595	if (!current_thread_info()->utraps) {
	596	if (put_user(NULL, old_p))
	597	return -EFAULT;
	598	} else {
	599	if (put_user((utrap_handler_t)(current_thread_info()->utraps[type]), old_p))
	600	return -EFAULT;
	601	}
	602	}
	603	if (old_d) {
	604	if (put_user(NULL, old_d))
	605	return -EFAULT;
	606	}
	607	return 0;
	608	}
	609	if (!current_thread_info()->utraps) {
	610	current_thread_info()->utraps =
9132983a	611	kzalloc((UT_TRAP_INSTRUCTION_31+1)*sizeof(long), GFP_KERNEL);
1da177e4 LT	612	if (!current_thread_info()->utraps)
	613	return -ENOMEM;
	614	current_thread_info()->utraps[0] = 1;
1da177e4 LT	615	} else {
	616	if ((utrap_handler_t)current_thread_info()->utraps[type] != new_p &&
	617	current_thread_info()->utraps[0] > 1) {
207ddd0a	618	unsigned long *p = current_thread_info()->utraps;
1da177e4 LT	619
	620	current_thread_info()->utraps =
	621	kmalloc((UT_TRAP_INSTRUCTION_31+1)*sizeof(long),
	622	GFP_KERNEL);
	623	if (!current_thread_info()->utraps) {
	624	current_thread_info()->utraps = p;
	625	return -ENOMEM;
	626	}
	627	p[0]--;
	628	current_thread_info()->utraps[0] = 1;
	629	memcpy(current_thread_info()->utraps+1, p+1,
	630	UT_TRAP_INSTRUCTION_31*sizeof(long));
	631	}
	632	}
	633	if (old_p) {
	634	if (put_user((utrap_handler_t)(current_thread_info()->utraps[type]), old_p))
	635	return -EFAULT;
	636	}
	637	if (old_d) {
	638	if (put_user(NULL, old_d))
	639	return -EFAULT;
	640	}
	641	current_thread_info()->utraps[type] = (long)new_p;
	642
	643	return 0;
	644	}
	645
207ddd0a DM	646	asmlinkage long sparc_memory_ordering(unsigned long model,
207ddd0a DM	647	struct pt_regs *regs)
1da177e4 LT	648	{
	649	if (model >= 3)
	650	return -EINVAL;
	651	regs->tstate = (regs->tstate & ~TSTATE_MM) \| (model << 14);
	652	return 0;
	653	}
	654
e4265019 DM	655	SYSCALL_DEFINE5(rt_sigaction, int, sig, const struct sigaction __user *, act,
	656	struct sigaction __user , oact, void __user , restorer,
	657	size_t, sigsetsize)
1da177e4 LT	658	{
	659	struct k_sigaction new_ka, old_ka;
	660	int ret;
	661
	662	/* XXX: Don't preclude handling different sized sigset_t's. */
	663	if (sigsetsize != sizeof(sigset_t))
	664	return -EINVAL;
	665
	666	if (act) {
	667	new_ka.ka_restorer = restorer;
	668	if (copy_from_user(&new_ka.sa, act, sizeof(*act)))
	669	return -EFAULT;
	670	}
	671
	672	ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);
	673
	674	if (!ret && oact) {
	675	if (copy_to_user(oact, &old_ka.sa, sizeof(*oact)))
	676	return -EFAULT;
	677	}
	678
	679	return ret;
	680	}
	681
517ffce4 DM	682	asmlinkage long sys_kern_features(void)
	683	{
	684	return KERN_FEATURE_MIXED_MODE_STACK;
	685	}