[linux-2.6-block.git] / arch / sparc / kernel / sys_sparc_64.c

// SPDX-License-Identifier: GPL-2.0
/* 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/signal.h>
#include <linux/sched/mm.h>
#include <linux/sched/debug.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 <linux/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 <= vm_start_gap(vma)))
			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 <= vm_start_gap(vma)))
			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 int)second, NULL);
			goto out;
		case SEMTIMEDOP:
			err = sys_semtimedop(first, ptr, (unsigned int)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
b2441318	1	// SPDX-License-Identifier: GPL-2.0
207ddd0a	2	/* linux/arch/sparc64/kernel/sys_sparc.c
1da177e4 LT	3	*
	4	* This file contains various random system calls that
	5	* have a non-standard calling sequence on the Linux/sparc
	6	* platform.
	7	*/
	8
1da177e4 LT	9	#include <linux/errno.h>
1da177e4 LT	10	#include <linux/types.h>
3f07c014	11	#include <linux/sched/signal.h>
01042607	12	#include <linux/sched/mm.h>
b17b0153	13	#include <linux/sched/debug.h>
1da177e4 LT	14	#include <linux/fs.h>
	15	#include <linux/file.h>
	16	#include <linux/mm.h>
	17	#include <linux/sem.h>
	18	#include <linux/msg.h>
	19	#include <linux/shm.h>
	20	#include <linux/stat.h>
	21	#include <linux/mman.h>
	22	#include <linux/utsname.h>
	23	#include <linux/smp.h>
1da177e4 LT	24	#include <linux/slab.h>
	25	#include <linux/syscalls.h>
	26	#include <linux/ipc.h>
	27	#include <linux/personality.h>
05f9ca83	28	#include <linux/random.h>
066bcaca	29	#include <linux/export.h>
812cb83a	30	#include <linux/context_tracking.h>
1da177e4	31
7c0f6ba6	32	#include <linux/uaccess.h>
1da177e4	33	#include <asm/utrap.h>
fe74290d	34	#include <asm/unistd.h>
1da177e4	35
207ddd0a	36	#include "entry.h"
8df52620	37	#include "kernel.h"
207ddd0a DM	38	#include "systbls.h"
207ddd0a DM	39
1da177e4 LT	40	/* #define DEBUG_UNIMP_SYSCALL */
1da177e4 LT	41
1da177e4 LT	42	asmlinkage unsigned long sys_getpagesize(void)
	43	{
	44	return PAGE_SIZE;
	45	}
	46
8bcd1741 DM	47	/* Does addr --> addr+len fall within 4GB of the VA-space hole or
	48	* overflow past the end of the 64-bit address space?
	49	*/
	50	static inline int invalid_64bit_range(unsigned long addr, unsigned long len)
	51	{
	52	unsigned long va_exclude_start, va_exclude_end;
	53
	54	va_exclude_start = VA_EXCLUDE_START;
	55	va_exclude_end = VA_EXCLUDE_END;
	56
	57	if (unlikely(len >= va_exclude_start))
	58	return 1;
	59
	60	if (unlikely((addr + len) < addr))
	61	return 1;
	62
	63	if (unlikely((addr >= va_exclude_start && addr < va_exclude_end) \|\|
	64	((addr + len) >= va_exclude_start &&
	65	(addr + len) < va_exclude_end)))
	66	return 1;
	67
	68	return 0;
	69	}
	70
a91690dd DM	71	/* These functions differ from the default implementations in
	72	* mm/mmap.c in two ways:
	73	*
	74	* 1) For file backed MAP_SHARED mmap()'s we D-cache color align,
	75	* for fixed such mappings we just validate what the user gave us.
	76	* 2) For 64-bit tasks we avoid mapping anything within 4GB of
	77	* the spitfire/niagara VA-hole.
	78	*/
	79
748ba883	80	static inline unsigned long COLOR_ALIGN(unsigned long addr,
a91690dd DM	81	unsigned long pgoff)
	82	{
	83	unsigned long base = (addr+SHMLBA-1)&~(SHMLBA-1);
	84	unsigned long off = (pgoff<<PAGE_SHIFT) & (SHMLBA-1);
	85
	86	return base + off;
	87	}
	88
1da177e4 LT	89	unsigned long arch_get_unmapped_area(struct file *filp, unsigned long addr, unsigned long len, unsigned long pgoff, unsigned long flags)
	90	{
	91	struct mm_struct *mm = current->mm;
	92	struct vm_area_struct * vma;
	93	unsigned long task_size = TASK_SIZE;
1da177e4	94	int do_color_align;
bb64f550	95	struct vm_unmapped_area_info info;
1da177e4 LT	96
	97	if (flags & MAP_FIXED) {
	98	/* We do not accept a shared mapping if it would violate
	99	* cache aliasing constraints.
	100	*/
	101	if ((flags & MAP_SHARED) &&
	102	((addr - (pgoff << PAGE_SHIFT)) & (SHMLBA - 1)))
	103	return -EINVAL;
	104	return addr;
	105	}
	106
	107	if (test_thread_flag(TIF_32BIT))
d61e16df	108	task_size = STACK_TOP32;
a91690dd	109	if (unlikely(len > task_size \|\| len >= VA_EXCLUDE_START))
1da177e4 LT	110	return -ENOMEM;
	111
	112	do_color_align = 0;
	113	if (filp \|\| (flags & MAP_SHARED))
	114	do_color_align = 1;
	115
	116	if (addr) {
	117	if (do_color_align)
748ba883	118	addr = COLOR_ALIGN(addr, pgoff);
1da177e4 LT	119	else
	120	addr = PAGE_ALIGN(addr);
	121
	122	vma = find_vma(mm, addr);
	123	if (task_size - len >= addr &&
1be7107f	124	(!vma \|\| addr + len <= vm_start_gap(vma)))
1da177e4 LT	125	return addr;
	126	}
	127
bb64f550 ML	128	info.flags = 0;
	129	info.length = len;
	130	info.low_limit = TASK_UNMAPPED_BASE;
	131	info.high_limit = min(task_size, VA_EXCLUDE_START);
	132	info.align_mask = do_color_align ? (PAGE_MASK & (SHMLBA - 1)) : 0;
	133	info.align_offset = pgoff << PAGE_SHIFT;
	134	addr = vm_unmapped_area(&info);
	135
	136	if ((addr & ~PAGE_MASK) && task_size > VA_EXCLUDE_END) {
	137	VM_BUG_ON(addr != -ENOMEM);
	138	info.low_limit = VA_EXCLUDE_END;
	139	info.high_limit = task_size;
	140	addr = vm_unmapped_area(&info);
1363c3cd	141	}
1da177e4	142
bb64f550	143	return addr;
1da177e4 LT	144	}
1da177e4 LT	145
a91690dd DM	146	unsigned long
	147	arch_get_unmapped_area_topdown(struct file *filp, const unsigned long addr0,
	148	const unsigned long len, const unsigned long pgoff,
	149	const unsigned long flags)
	150	{
	151	struct vm_area_struct *vma;
	152	struct mm_struct *mm = current->mm;
d61e16df	153	unsigned long task_size = STACK_TOP32;
a91690dd DM	154	unsigned long addr = addr0;
a91690dd DM	155	int do_color_align;
bb64f550	156	struct vm_unmapped_area_info info;
a91690dd DM	157
	158	/* This should only ever run for 32-bit processes. */
	159	BUG_ON(!test_thread_flag(TIF_32BIT));
	160
	161	if (flags & MAP_FIXED) {
	162	/* We do not accept a shared mapping if it would violate
	163	* cache aliasing constraints.
	164	*/
	165	if ((flags & MAP_SHARED) &&
	166	((addr - (pgoff << PAGE_SHIFT)) & (SHMLBA - 1)))
	167	return -EINVAL;
	168	return addr;
	169	}
	170
	171	if (unlikely(len > task_size))
	172	return -ENOMEM;
	173
	174	do_color_align = 0;
	175	if (filp \|\| (flags & MAP_SHARED))
	176	do_color_align = 1;
	177
	178	/* requesting a specific address */
	179	if (addr) {
	180	if (do_color_align)
748ba883	181	addr = COLOR_ALIGN(addr, pgoff);
a91690dd DM	182	else
	183	addr = PAGE_ALIGN(addr);
	184
	185	vma = find_vma(mm, addr);
	186	if (task_size - len >= addr &&
1be7107f	187	(!vma \|\| addr + len <= vm_start_gap(vma)))
a91690dd DM	188	return addr;
	189	}
	190
bb64f550 ML	191	info.flags = VM_UNMAPPED_AREA_TOPDOWN;
	192	info.length = len;
	193	info.low_limit = PAGE_SIZE;
	194	info.high_limit = mm->mmap_base;
	195	info.align_mask = do_color_align ? (PAGE_MASK & (SHMLBA - 1)) : 0;
	196	info.align_offset = pgoff << PAGE_SHIFT;
	197	addr = vm_unmapped_area(&info);
a91690dd	198
a91690dd DM	199	/*
	200	* A failed mmap() very likely causes application failure,
	201	* so fall back to the bottom-up function here. This scenario
	202	* can happen with large stack limits and large mmap()
	203	* allocations.
	204	*/
bb64f550 ML	205	if (addr & ~PAGE_MASK) {
	206	VM_BUG_ON(addr != -ENOMEM);
	207	info.flags = 0;
	208	info.low_limit = TASK_UNMAPPED_BASE;
	209	info.high_limit = STACK_TOP32;
	210	addr = vm_unmapped_area(&info);
	211	}
a91690dd DM	212
	213	return addr;
	214	}
	215
1da177e4 LT	216	/* Try to align mapping such that we align it as much as possible. */
	217	unsigned long get_fb_unmapped_area(struct file *filp, unsigned long orig_addr, unsigned long len, unsigned long pgoff, unsigned long flags)
	218	{
	219	unsigned long align_goal, addr = -ENOMEM;
c4caa778 AV	220	unsigned long (get_area)(struct file , unsigned long,
	221	unsigned long, unsigned long, unsigned long);
	222
	223	get_area = current->mm->get_unmapped_area;
1da177e4 LT	224
	225	if (flags & MAP_FIXED) {
	226	/* Ok, don't mess with it. */
c4caa778	227	return get_area(NULL, orig_addr, len, pgoff, flags);
1da177e4 LT	228	}
	229	flags &= ~MAP_SHARED;
	230
	231	align_goal = PAGE_SIZE;
	232	if (len >= (4UL * 1024 * 1024))
	233	align_goal = (4UL * 1024 * 1024);
	234	else if (len >= (512UL * 1024))
	235	align_goal = (512UL * 1024);
	236	else if (len >= (64UL * 1024))
	237	align_goal = (64UL * 1024);
	238
	239	do {
c4caa778	240	addr = get_area(NULL, orig_addr, len + (align_goal - PAGE_SIZE), pgoff, flags);
1da177e4 LT	241	if (!(addr & ~PAGE_MASK)) {
	242	addr = (addr + (align_goal - 1UL)) & ~(align_goal - 1UL);
	243	break;
	244	}
	245
	246	if (align_goal == (4UL * 1024 * 1024))
	247	align_goal = (512UL * 1024);
	248	else if (align_goal == (512UL * 1024))
	249	align_goal = (64UL * 1024);
	250	else
	251	align_goal = PAGE_SIZE;
	252	} while ((addr & ~PAGE_MASK) && align_goal > PAGE_SIZE);
	253
	254	/* Mapping is smaller than 64K or larger areas could not
	255	* be obtained.
	256	*/
	257	if (addr & ~PAGE_MASK)
c4caa778	258	addr = get_area(NULL, orig_addr, len, pgoff, flags);
1da177e4 LT	259
	260	return addr;
	261	}
917c3660	262	EXPORT_SYMBOL(get_fb_unmapped_area);
1da177e4	263
5a0efea0 DM	264	/* Essentially the same as PowerPC. */
5a0efea0 DM	265	static unsigned long mmap_rnd(void)
a91690dd	266	{
5a0efea0	267	unsigned long rnd = 0UL;
05f9ca83 DM	268
05f9ca83 DM	269	if (current->flags & PF_RANDOMIZE) {
5ef11c35	270	unsigned long val = get_random_long();
05f9ca83	271	if (test_thread_flag(TIF_32BIT))
fa8cbaaf	272	rnd = (val % (1UL << (23UL-PAGE_SHIFT)));
05f9ca83	273	else
fa8cbaaf	274	rnd = (val % (1UL << (30UL-PAGE_SHIFT)));
05f9ca83	275	}
fa8cbaaf	276	return rnd << PAGE_SHIFT;
5a0efea0 DM	277	}
	278
	279	void arch_pick_mmap_layout(struct mm_struct *mm)
	280	{
	281	unsigned long random_factor = mmap_rnd();
	282	unsigned long gap;
05f9ca83	283
a91690dd DM	284	/*
	285	* Fall back to the standard layout if the personality
	286	* bit is set, or if the expected stack growth is unlimited:
	287	*/
76704fb5	288	gap = rlimit(RLIMIT_STACK);
a91690dd DM	289	if (!test_thread_flag(TIF_32BIT) \|\|
a91690dd DM	290	(current->personality & ADDR_COMPAT_LAYOUT) \|\|
76704fb5	291	gap == RLIM_INFINITY \|\|
a91690dd	292	sysctl_legacy_va_layout) {
05f9ca83	293	mm->mmap_base = TASK_UNMAPPED_BASE + random_factor;
a91690dd	294	mm->get_unmapped_area = arch_get_unmapped_area;
a91690dd DM	295	} else {
a91690dd DM	296	/* We know it's 32-bit */
d61e16df	297	unsigned long task_size = STACK_TOP32;
a91690dd	298
a91690dd DM	299	if (gap < 128 * 1024 * 1024)
	300	gap = 128 * 1024 * 1024;
	301	if (gap > (task_size / 6 * 5))
	302	gap = (task_size / 6 * 5);
	303
05f9ca83	304	mm->mmap_base = PAGE_ALIGN(task_size - gap - random_factor);
a91690dd	305	mm->get_unmapped_area = arch_get_unmapped_area_topdown;
a91690dd DM	306	}
	307	}
	308
1da177e4 LT	309	/*
	310	* sys_pipe() is the normal C calling standard for creating
	311	* a pipe. It's not the way unix traditionally does this, though.
	312	*/
e4265019	313	SYSCALL_DEFINE1(sparc_pipe_real, struct pt_regs *, regs)
1da177e4 LT	314	{
	315	int fd[2];
	316	int error;
	317
ed8cae8b	318	error = do_pipe_flags(fd, 0);
1da177e4 LT	319	if (error)
	320	goto out;
	321	regs->u_regs[UREG_I1] = fd[1];
	322	error = fd[0];
	323	out:
	324	return error;
	325	}
	326
	327	/*
	328	* sys_ipc() is the de-multiplexer for the SysV IPC calls..
	329	*
	330	* This is really horribly ugly.
	331	*/
	332
baed7fc9	333	SYSCALL_DEFINE6(sparc_ipc, unsigned int, call, int, first, unsigned long, second,
e4265019	334	unsigned long, third, void __user *, ptr, long, fifth)
1da177e4	335	{
7379b42b	336	long err;
1da177e4 LT	337
1da177e4 LT	338	/* No need for backward compatibility. We can start fresh... */
53eb2516	339	if (call <= SEMTIMEDOP) {
1da177e4 LT	340	switch (call) {
	341	case SEMOP:
	342	err = sys_semtimedop(first, ptr,
9ef595d8	343	(unsigned int)second, NULL);
1da177e4 LT	344	goto out;
1da177e4 LT	345	case SEMTIMEDOP:
9ef595d8	346	err = sys_semtimedop(first, ptr, (unsigned int)second,
207ddd0a DM	347	(const struct timespec __user *)
207ddd0a DM	348	(unsigned long) fifth);
1da177e4 LT	349	goto out;
	350	case SEMGET:
	351	err = sys_semget(first, (int)second, (int)third);
	352	goto out;
	353	case SEMCTL: {
020cfb05 DM	354	err = sys_semctl(first, second,
020cfb05 DM	355	(int)third \| IPC_64,
e1fd1f49	356	(unsigned long) ptr);
1da177e4 LT	357	goto out;
	358	}
	359	default:
	360	err = -ENOSYS;
	361	goto out;
6cb79b3f	362	}
1da177e4 LT	363	}
	364	if (call <= MSGCTL) {
	365	switch (call) {
	366	case MSGSND:
	367	err = sys_msgsnd(first, ptr, (size_t)second,
	368	(int)third);
	369	goto out;
	370	case MSGRCV:
	371	err = sys_msgrcv(first, ptr, (size_t)second, fifth,
	372	(int)third);
	373	goto out;
	374	case MSGGET:
	375	err = sys_msgget((key_t)first, (int)second);
	376	goto out;
	377	case MSGCTL:
	378	err = sys_msgctl(first, (int)second \| IPC_64, ptr);
	379	goto out;
	380	default:
	381	err = -ENOSYS;
	382	goto out;
6cb79b3f	383	}
1da177e4 LT	384	}
	385	if (call <= SHMCTL) {
	386	switch (call) {
	387	case SHMAT: {
	388	ulong raddr;
079a96ae	389	err = do_shmat(first, ptr, (int)second, &raddr, SHMLBA);
1da177e4 LT	390	if (!err) {
	391	if (put_user(raddr,
	392	(ulong __user *) third))
	393	err = -EFAULT;
	394	}
	395	goto out;
	396	}
	397	case SHMDT:
	398	err = sys_shmdt(ptr);
	399	goto out;
	400	case SHMGET:
	401	err = sys_shmget(first, (size_t)second, (int)third);
	402	goto out;
	403	case SHMCTL:
	404	err = sys_shmctl(first, (int)second \| IPC_64, ptr);
	405	goto out;
	406	default:
	407	err = -ENOSYS;
	408	goto out;
6cb79b3f	409	}
1da177e4 LT	410	} else {
	411	err = -ENOSYS;
	412	}
	413	out:
	414	return err;
	415	}
	416
e4265019	417	SYSCALL_DEFINE1(sparc64_personality, unsigned long, personality)
1da177e4	418	{
525fd5a9	419	long ret;
1da177e4	420
a27032ee JK	421	if (personality(current->personality) == PER_LINUX32 &&
	422	personality(personality) == PER_LINUX)
	423	personality \|= PER_LINUX32;
1da177e4	424	ret = sys_personality(personality);
a27032ee JK	425	if (personality(ret) == PER_LINUX32)
a27032ee JK	426	ret &= ~PER_LINUX32;
1da177e4 LT	427
	428	return ret;
	429	}
	430
f92ffa12	431	int sparc_mmap_check(unsigned long addr, unsigned long len)
3a459756 KK	432	{
	433	if (test_thread_flag(TIF_32BIT)) {
	434	if (len >= STACK_TOP32)
	435	return -EINVAL;
	436
58163393	437	if (addr > STACK_TOP32 - len)
3a459756 KK	438	return -EINVAL;
	439	} else {
	440	if (len >= VA_EXCLUDE_START)
	441	return -EINVAL;
	442
58163393	443	if (invalid_64bit_range(addr, len))
3a459756 KK	444	return -EINVAL;
	445	}
	446
	447	return 0;
	448	}
	449
1da177e4	450	/* Linux version of mmap */
e4265019 DM	451	SYSCALL_DEFINE6(mmap, unsigned long, addr, unsigned long, len,
	452	unsigned long, prot, unsigned long, flags, unsigned long, fd,
	453	unsigned long, off)
1da177e4	454	{
f8b72560	455	unsigned long retval = -EINVAL;
1da177e4	456
f8b72560 AV	457	if ((off + PAGE_ALIGN(len)) < off)
	458	goto out;
	459	if (off & ~PAGE_MASK)
	460	goto out;
	461	retval = sys_mmap_pgoff(addr, len, prot, flags, fd, off >> PAGE_SHIFT);
1da177e4 LT	462	out:
	463	return retval;
	464	}
	465
e4265019	466	SYSCALL_DEFINE2(64_munmap, unsigned long, addr, size_t, len)
1da177e4	467	{
8bcd1741	468	if (invalid_64bit_range(addr, len))
1da177e4	469	return -EINVAL;
8bcd1741	470
bfce281c	471	return vm_munmap(addr, len);
1da177e4	472	}
1da177e4	473
e4265019 DM	474	SYSCALL_DEFINE5(64_mremap, unsigned long, addr, unsigned long, old_len,
	475	unsigned long, new_len, unsigned long, flags,
	476	unsigned long, new_addr)
1da177e4	477	{
1da177e4	478	if (test_thread_flag(TIF_32BIT))
657bec85 AV	479	return -EINVAL;
657bec85 AV	480	return sys_mremap(addr, old_len, new_len, flags, new_addr);
1da177e4 LT	481	}
	482
	483	/* we come to here via sys_nis_syscall so it can setup the regs argument */
	484	asmlinkage unsigned long c_sys_nis_syscall(struct pt_regs *regs)
	485	{
	486	static int count;
	487
	488	/* Don't make the system unusable, if someone goes stuck */
	489	if (count++ > 5)
	490	return -ENOSYS;
	491
	492	printk ("Unimplemented SPARC system call %ld\n",regs->u_regs[1]);
	493	#ifdef DEBUG_UNIMP_SYSCALL
	494	show_regs (regs);
	495	#endif
	496
	497	return -ENOSYS;
	498	}
	499
	500	/* #define DEBUG_SPARC_BREAKPOINT */
	501
	502	asmlinkage void sparc_breakpoint(struct pt_regs *regs)
	503	{
812cb83a	504	enum ctx_state prev_state = exception_enter();
1da177e4 LT	505	siginfo_t info;
	506
	507	if (test_thread_flag(TIF_32BIT)) {
	508	regs->tpc &= 0xffffffff;
	509	regs->tnpc &= 0xffffffff;
	510	}
	511	#ifdef DEBUG_SPARC_BREAKPOINT
	512	printk ("TRAP: Entering kernel PC=%lx, nPC=%lx\n", regs->tpc, regs->tnpc);
	513	#endif
	514	info.si_signo = SIGTRAP;
	515	info.si_errno = 0;
	516	info.si_code = TRAP_BRKPT;
	517	info.si_addr = (void __user *)regs->tpc;
	518	info.si_trapno = 0;
	519	force_sig_info(SIGTRAP, &info, current);
	520	#ifdef DEBUG_SPARC_BREAKPOINT
	521	printk ("TRAP: Returning to space: PC=%lx nPC=%lx\n", regs->tpc, regs->tnpc);
	522	#endif
812cb83a	523	exception_exit(prev_state);
1da177e4 LT	524	}
	525
	526	extern void check_pending(int signum);
	527
e4265019	528	SYSCALL_DEFINE2(getdomainname, char __user *, name, int, len)
1da177e4	529	{
8310a32c DM	530	int nlen, err;
8310a32c DM	531
b9c54f91	532	if (len < 0)
8310a32c	533	return -EINVAL;
1da177e4 LT	534
	535	down_read(&uts_sem);
	536
e9ff3990	537	nlen = strlen(utsname()->domainname) + 1;
b9c54f91 AW	538	err = -EINVAL;
	539	if (nlen > len)
	540	goto out;
8310a32c DM	541
8310a32c DM	542	err = -EFAULT;
e9ff3990	543	if (!copy_to_user(name, utsname()->domainname, nlen))
8310a32c DM	544	err = 0;
8310a32c DM	545
b9c54f91	546	out:
1da177e4 LT	547	up_read(&uts_sem);
	548	return err;
	549	}
	550
e4265019 DM	551	SYSCALL_DEFINE5(utrap_install, utrap_entry_t, type,
	552	utrap_handler_t, new_p, utrap_handler_t, new_d,
	553	utrap_handler_t __user *, old_p,
	554	utrap_handler_t __user *, old_d)
1da177e4 LT	555	{
	556	if (type < UT_INSTRUCTION_EXCEPTION \|\| type > UT_TRAP_INSTRUCTION_31)
	557	return -EINVAL;
	558	if (new_p == (utrap_handler_t)(long)UTH_NOCHANGE) {
	559	if (old_p) {
	560	if (!current_thread_info()->utraps) {
	561	if (put_user(NULL, old_p))
	562	return -EFAULT;
	563	} else {
	564	if (put_user((utrap_handler_t)(current_thread_info()->utraps[type]), old_p))
	565	return -EFAULT;
	566	}
	567	}
	568	if (old_d) {
	569	if (put_user(NULL, old_d))
	570	return -EFAULT;
	571	}
	572	return 0;
	573	}
	574	if (!current_thread_info()->utraps) {
	575	current_thread_info()->utraps =
9132983a	576	kzalloc((UT_TRAP_INSTRUCTION_31+1)*sizeof(long), GFP_KERNEL);
1da177e4 LT	577	if (!current_thread_info()->utraps)
	578	return -ENOMEM;
	579	current_thread_info()->utraps[0] = 1;
1da177e4 LT	580	} else {
	581	if ((utrap_handler_t)current_thread_info()->utraps[type] != new_p &&
	582	current_thread_info()->utraps[0] > 1) {
207ddd0a	583	unsigned long *p = current_thread_info()->utraps;
1da177e4 LT	584
	585	current_thread_info()->utraps =
	586	kmalloc((UT_TRAP_INSTRUCTION_31+1)*sizeof(long),
	587	GFP_KERNEL);
	588	if (!current_thread_info()->utraps) {
	589	current_thread_info()->utraps = p;
	590	return -ENOMEM;
	591	}
	592	p[0]--;
	593	current_thread_info()->utraps[0] = 1;
	594	memcpy(current_thread_info()->utraps+1, p+1,
	595	UT_TRAP_INSTRUCTION_31*sizeof(long));
	596	}
	597	}
	598	if (old_p) {
	599	if (put_user((utrap_handler_t)(current_thread_info()->utraps[type]), old_p))
	600	return -EFAULT;
	601	}
	602	if (old_d) {
	603	if (put_user(NULL, old_d))
	604	return -EFAULT;
	605	}
	606	current_thread_info()->utraps[type] = (long)new_p;
	607
	608	return 0;
	609	}
	610
207ddd0a DM	611	asmlinkage long sparc_memory_ordering(unsigned long model,
207ddd0a DM	612	struct pt_regs *regs)
1da177e4 LT	613	{
	614	if (model >= 3)
	615	return -EINVAL;
	616	regs->tstate = (regs->tstate & ~TSTATE_MM) \| (model << 14);
	617	return 0;
	618	}
	619
e4265019 DM	620	SYSCALL_DEFINE5(rt_sigaction, int, sig, const struct sigaction __user *, act,
	621	struct sigaction __user , oact, void __user , restorer,
	622	size_t, sigsetsize)
1da177e4 LT	623	{
	624	struct k_sigaction new_ka, old_ka;
	625	int ret;
	626
	627	/* XXX: Don't preclude handling different sized sigset_t's. */
	628	if (sigsetsize != sizeof(sigset_t))
	629	return -EINVAL;
	630
	631	if (act) {
	632	new_ka.ka_restorer = restorer;
	633	if (copy_from_user(&new_ka.sa, act, sizeof(*act)))
	634	return -EFAULT;
	635	}
	636
	637	ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);
	638
	639	if (!ret && oact) {
	640	if (copy_to_user(oact, &old_ka.sa, sizeof(*oact)))
	641	return -EFAULT;
	642	}
	643
	644	return ret;
	645	}
	646
517ffce4 DM	647	asmlinkage long sys_kern_features(void)
	648	{
	649	return KERN_FEATURE_MIXED_MODE_STACK;
	650	}