[deliverable/linux.git] / arch / mips / kernel / syscall.c

/*
 * This file is subject to the terms and conditions of the GNU General Public
 * License.  See the file "COPYING" in the main directory of this archive
 * for more details.
 *
 * Copyright (C) 1995, 1996, 1997, 2000, 2001, 05 by Ralf Baechle
 * Copyright (C) 1999, 2000 Silicon Graphics, Inc.
 * Copyright (C) 2001 MIPS Technologies, Inc.
 */
#include <linux/capability.h>
#include <linux/errno.h>
#include <linux/linkage.h>
#include <linux/mm.h>
#include <linux/fs.h>
#include <linux/smp.h>
#include <linux/mman.h>
#include <linux/ptrace.h>
#include <linux/sched.h>
#include <linux/string.h>
#include <linux/syscalls.h>
#include <linux/file.h>
#include <linux/utsname.h>
#include <linux/unistd.h>
#include <linux/sem.h>
#include <linux/msg.h>
#include <linux/shm.h>
#include <linux/compiler.h>
#include <linux/module.h>
#include <linux/ipc.h>
#include <linux/uaccess.h>
#include <linux/slab.h>
#include <linux/random.h>

#include <asm/asm.h>
#include <asm/branch.h>
#include <asm/cachectl.h>
#include <asm/cacheflush.h>
#include <asm/asm-offsets.h>
#include <asm/signal.h>
#include <asm/sim.h>
#include <asm/shmparam.h>
#include <asm/sysmips.h>
#include <asm/uaccess.h>

/*
 * For historic reasons the pipe(2) syscall on MIPS has an unusual calling
 * convention.  It returns results in registers $v0 / $v1 which means there
 * is no need for it to do verify the validity of a userspace pointer
 * argument.  Historically that used to be expensive in Linux.  These days
 * the performance advantage is negligible.
 */
asmlinkage int sysm_pipe(nabi_no_regargs volatile struct pt_regs regs)
{
	int fd[2];
	int error, res;

	error = do_pipe_flags(fd, 0);
	if (error) {
		res = error;
		goto out;
	}
	regs.regs[3] = fd[1];
	res = fd[0];
out:
	return res;
}

unsigned long shm_align_mask = PAGE_SIZE - 1;	/* Sane caches */

EXPORT_SYMBOL(shm_align_mask);

#define COLOUR_ALIGN(addr,pgoff)				\
	((((addr) + shm_align_mask) & ~shm_align_mask) +	\
	 (((pgoff) << PAGE_SHIFT) & shm_align_mask))

unsigned long arch_get_unmapped_area(struct file *filp, unsigned long addr,
	unsigned long len, unsigned long pgoff, unsigned long flags)
{
	struct vm_area_struct * vmm;
	int do_color_align;
	unsigned long task_size;

#ifdef CONFIG_32BIT
	task_size = TASK_SIZE;
#else /* Must be CONFIG_64BIT*/
	task_size = test_thread_flag(TIF_32BIT_ADDR) ? TASK_SIZE32 : TASK_SIZE;
#endif

	if (len > task_size)
		return -ENOMEM;

	if (flags & MAP_FIXED) {
		/* Even MAP_FIXED mappings must reside within task_size.  */
		if (task_size - len < addr)
			return -EINVAL;

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

	do_color_align = 0;
	if (filp || (flags & MAP_SHARED))
		do_color_align = 1;
	if (addr) {
		if (do_color_align)
			addr = COLOUR_ALIGN(addr, pgoff);
		else
			addr = PAGE_ALIGN(addr);
		vmm = find_vma(current->mm, addr);
		if (task_size - len >= addr &&
		    (!vmm || addr + len <= vmm->vm_start))
			return addr;
	}
	addr = current->mm->mmap_base;
	if (do_color_align)
		addr = COLOUR_ALIGN(addr, pgoff);
	else
		addr = PAGE_ALIGN(addr);

	for (vmm = find_vma(current->mm, addr); ; vmm = vmm->vm_next) {
		/* At this point:  (!vmm || addr < vmm->vm_end). */
		if (task_size - len < addr)
			return -ENOMEM;
		if (!vmm || addr + len <= vmm->vm_start)
			return addr;
		addr = vmm->vm_end;
		if (do_color_align)
			addr = COLOUR_ALIGN(addr, pgoff);
	}
}

void arch_pick_mmap_layout(struct mm_struct *mm)
{
	unsigned long random_factor = 0UL;

	if (current->flags & PF_RANDOMIZE) {
		random_factor = get_random_int();
		random_factor = random_factor << PAGE_SHIFT;
		if (TASK_IS_32BIT_ADDR)
			random_factor &= 0xfffffful;
		else
			random_factor &= 0xffffffful;
	}

	mm->mmap_base = TASK_UNMAPPED_BASE + random_factor;
	mm->get_unmapped_area = arch_get_unmapped_area;
	mm->unmap_area = arch_unmap_area;
}

SYSCALL_DEFINE6(mips_mmap, unsigned long, addr, unsigned long, len,
	unsigned long, prot, unsigned long, flags, unsigned long,
	fd, off_t, offset)
{
	unsigned long result;

	result = -EINVAL;
	if (offset & ~PAGE_MASK)
		goto out;

	result = sys_mmap_pgoff(addr, len, prot, flags, fd, offset >> PAGE_SHIFT);

out:
	return result;
}

SYSCALL_DEFINE6(mips_mmap2, unsigned long, addr, unsigned long, len,
	unsigned long, prot, unsigned long, flags, unsigned long, fd,
	unsigned long, pgoff)
{
	if (pgoff & (~PAGE_MASK >> 12))
		return -EINVAL;

	return sys_mmap_pgoff(addr, len, prot, flags, fd, pgoff >> (PAGE_SHIFT-12));
}

save_static_function(sys_fork);
static int __used noinline
_sys_fork(nabi_no_regargs struct pt_regs regs)
{
	return do_fork(SIGCHLD, regs.regs[29], &regs, 0, NULL, NULL);
}

save_static_function(sys_clone);
static int __used noinline
_sys_clone(nabi_no_regargs struct pt_regs regs)
{
	unsigned long clone_flags;
	unsigned long newsp;
	int __user *parent_tidptr, *child_tidptr;

	clone_flags = regs.regs[4];
	newsp = regs.regs[5];
	if (!newsp)
		newsp = regs.regs[29];
	parent_tidptr = (int __user *) regs.regs[6];
#ifdef CONFIG_32BIT
	/* We need to fetch the fifth argument off the stack.  */
	child_tidptr = NULL;
	if (clone_flags & (CLONE_CHILD_SETTID | CLONE_CHILD_CLEARTID)) {
		int __user *__user *usp = (int __user *__user *) regs.regs[29];
		if (regs.regs[2] == __NR_syscall) {
			if (get_user (child_tidptr, &usp[5]))
				return -EFAULT;
		}
		else if (get_user (child_tidptr, &usp[4]))
			return -EFAULT;
	}
#else
	child_tidptr = (int __user *) regs.regs[8];
#endif
	return do_fork(clone_flags, newsp, &regs, 0,
	               parent_tidptr, child_tidptr);
}

/*
 * sys_execve() executes a new program.
 */
asmlinkage int sys_execve(nabi_no_regargs struct pt_regs regs)
{
	int error;
	char * filename;

	filename = getname((char __user *) (long)regs.regs[4]);
	error = PTR_ERR(filename);
	if (IS_ERR(filename))
		goto out;
	error = do_execve(filename, (char __user *__user *) (long)regs.regs[5],
	                  (char __user *__user *) (long)regs.regs[6], &regs);
	putname(filename);

out:
	return error;
}

SYSCALL_DEFINE1(set_thread_area, unsigned long, addr)
{
	struct thread_info *ti = task_thread_info(current);

	ti->tp_value = addr;
	if (cpu_has_userlocal)
		write_c0_userlocal(addr);

	return 0;
}

static inline int mips_atomic_set(struct pt_regs *regs,
	unsigned long addr, unsigned long new)
{
	unsigned long old, tmp;
	unsigned int err;

	if (unlikely(addr & 3))
		return -EINVAL;

	if (unlikely(!access_ok(VERIFY_WRITE, addr, 4)))
		return -EINVAL;

	if (cpu_has_llsc && R10000_LLSC_WAR) {
		__asm__ __volatile__ (
		"	.set	mips3					\n"
		"	li	%[err], 0				\n"
		"1:	ll	%[old], (%[addr])			\n"
		"	move	%[tmp], %[new]				\n"
		"2:	sc	%[tmp], (%[addr])			\n"
		"	beqzl	%[tmp], 1b				\n"
		"3:							\n"
		"	.section .fixup,\"ax\"				\n"
		"4:	li	%[err], %[efault]			\n"
		"	j	3b					\n"
		"	.previous					\n"
		"	.section __ex_table,\"a\"			\n"
		"	"STR(PTR)"	1b, 4b				\n"
		"	"STR(PTR)"	2b, 4b				\n"
		"	.previous					\n"
		"	.set	mips0					\n"
		: [old] "=&r" (old),
		  [err] "=&r" (err),
		  [tmp] "=&r" (tmp)
		: [addr] "r" (addr),
		  [new] "r" (new),
		  [efault] "i" (-EFAULT)
		: "memory");
	} else if (cpu_has_llsc) {
		__asm__ __volatile__ (
		"	.set	mips3					\n"
		"	li	%[err], 0				\n"
		"1:	ll	%[old], (%[addr])			\n"
		"	move	%[tmp], %[new]				\n"
		"2:	sc	%[tmp], (%[addr])			\n"
		"	bnez	%[tmp], 4f				\n"
		"3:							\n"
		"	.subsection 2					\n"
		"4:	b	1b					\n"
		"	.previous					\n"
		"							\n"
		"	.section .fixup,\"ax\"				\n"
		"5:	li	%[err], %[efault]			\n"
		"	j	3b					\n"
		"	.previous					\n"
		"	.section __ex_table,\"a\"			\n"
		"	"STR(PTR)"	1b, 5b				\n"
		"	"STR(PTR)"	2b, 5b				\n"
		"	.previous					\n"
		"	.set	mips0					\n"
		: [old] "=&r" (old),
		  [err] "=&r" (err),
		  [tmp] "=&r" (tmp)
		: [addr] "r" (addr),
		  [new] "r" (new),
		  [efault] "i" (-EFAULT)
		: "memory");
	} else {
		do {
			preempt_disable();
			ll_bit = 1;
			ll_task = current;
			preempt_enable();

			err = __get_user(old, (unsigned int *) addr);
			err |= __put_user(new, (unsigned int *) addr);
			if (err)
				break;
			rmb();
		} while (!ll_bit);
	}

	if (unlikely(err))
		return err;

	regs->regs[2] = old;
	regs->regs[7] = 0;	/* No error */

	/*
	 * Don't let your children do this ...
	 */
	__asm__ __volatile__(
	"	move	$29, %0						\n"
	"	j	syscall_exit					\n"
	: /* no outputs */
	: "r" (regs));

	/* unreached.  Honestly.  */
	while (1);
}

save_static_function(sys_sysmips);
static int __used noinline
_sys_sysmips(nabi_no_regargs struct pt_regs regs)
{
	long cmd, arg1, arg2, arg3;

	cmd = regs.regs[4];
	arg1 = regs.regs[5];
	arg2 = regs.regs[6];
	arg3 = regs.regs[7];

	switch (cmd) {
	case MIPS_ATOMIC_SET:
		return mips_atomic_set(&regs, arg1, arg2);

	case MIPS_FIXADE:
		if (arg1 & ~3)
			return -EINVAL;

		if (arg1 & 1)
			set_thread_flag(TIF_FIXADE);
		else
			clear_thread_flag(TIF_FIXADE);
		if (arg1 & 2)
			set_thread_flag(TIF_LOGADE);
		else
			clear_thread_flag(TIF_FIXADE);

		return 0;

	case FLUSH_CACHE:
		__flush_cache_all();
		return 0;
	}

	return -EINVAL;
}

/*
 * No implemented yet ...
 */
SYSCALL_DEFINE3(cachectl, char *, addr, int, nbytes, int, op)
{
	return -ENOSYS;
}

/*
 * If we ever come here the user sp is bad.  Zap the process right away.
 * Due to the bad stack signaling wouldn't work.
 */
asmlinkage void bad_stack(void)
{
	do_exit(SIGSEGV);
}

/*
 * Do a system call from kernel instead of calling sys_execve so we
 * end up with proper pt_regs.
 */
int kernel_execve(const char *filename, char *const argv[], char *const envp[])
{
	register unsigned long __a0 asm("$4") = (unsigned long) filename;
	register unsigned long __a1 asm("$5") = (unsigned long) argv;
	register unsigned long __a2 asm("$6") = (unsigned long) envp;
	register unsigned long __a3 asm("$7");
	unsigned long __v0;

	__asm__ volatile ("					\n"
	"	.set	noreorder				\n"
	"	li	$2, %5		# __NR_execve		\n"
	"	syscall						\n"
	"	move	%0, $2					\n"
	"	.set	reorder					\n"
	: "=&r" (__v0), "=r" (__a3)
	: "r" (__a0), "r" (__a1), "r" (__a2), "i" (__NR_execve)
	: "$2", "$8", "$9", "$10", "$11", "$12", "$13", "$14", "$15", "$24",
	  "memory");

	if (__a3 == 0)
		return __v0;

	return -__v0;
}
Commit	Line	Data
1da177e4 LT	1	/*
	2	* This file is subject to the terms and conditions of the GNU General Public
	3	* License. See the file "COPYING" in the main directory of this archive
	4	* for more details.
	5	*
	6	* Copyright (C) 1995, 1996, 1997, 2000, 2001, 05 by Ralf Baechle
	7	* Copyright (C) 1999, 2000 Silicon Graphics, Inc.
	8	* Copyright (C) 2001 MIPS Technologies, Inc.
	9	*/
a9415644	10	#include <linux/capability.h>
1da177e4 LT	11	#include <linux/errno.h>
	12	#include <linux/linkage.h>
	13	#include <linux/mm.h>
4e950f6f	14	#include <linux/fs.h>
1da177e4	15	#include <linux/smp.h>
1da177e4 LT	16	#include <linux/mman.h>
	17	#include <linux/ptrace.h>
	18	#include <linux/sched.h>
	19	#include <linux/string.h>
	20	#include <linux/syscalls.h>
	21	#include <linux/file.h>
1da177e4 LT	22	#include <linux/utsname.h>
	23	#include <linux/unistd.h>
	24	#include <linux/sem.h>
	25	#include <linux/msg.h>
	26	#include <linux/shm.h>
	27	#include <linux/compiler.h>
9ff77c46	28	#include <linux/module.h>
cba4fbbf	29	#include <linux/ipc.h>
f1e39a4a	30	#include <linux/uaccess.h>
5a0e3ad6	31	#include <linux/slab.h>
1091458d	32	#include <linux/random.h>
1da177e4	33
f1e39a4a	34	#include <asm/asm.h>
1da177e4 LT	35	#include <asm/branch.h>
	36	#include <asm/cachectl.h>
	37	#include <asm/cacheflush.h>
048eb582	38	#include <asm/asm-offsets.h>
1da177e4 LT	39	#include <asm/signal.h>
	40	#include <asm/sim.h>
	41	#include <asm/shmparam.h>
	42	#include <asm/sysmips.h>
	43	#include <asm/uaccess.h>
	44
8213bbf9 RB	45	/*
	46	* For historic reasons the pipe(2) syscall on MIPS has an unusual calling
	47	* convention. It returns results in registers $v0 / $v1 which means there
	48	* is no need for it to do verify the validity of a userspace pointer
	49	* argument. Historically that used to be expensive in Linux. These days
	50	* the performance advantage is negligible.
	51	*/
	52	asmlinkage int sysm_pipe(nabi_no_regargs volatile struct pt_regs regs)
1da177e4 LT	53	{
	54	int fd[2];
	55	int error, res;
	56
ed8cae8b	57	error = do_pipe_flags(fd, 0);
1da177e4 LT	58	if (error) {
	59	res = error;
	60	goto out;
	61	}
	62	regs.regs[3] = fd[1];
	63	res = fd[0];
	64	out:
	65	return res;
	66	}
	67
	68	unsigned long shm_align_mask = PAGE_SIZE - 1; /* Sane caches */
	69
9ff77c46 RB	70	EXPORT_SYMBOL(shm_align_mask);
9ff77c46 RB	71
1da177e4 LT	72	#define COLOUR_ALIGN(addr,pgoff) \
	73	((((addr) + shm_align_mask) & ~shm_align_mask) + \
	74	(((pgoff) << PAGE_SHIFT) & shm_align_mask))
	75
	76	unsigned long arch_get_unmapped_area(struct file *filp, unsigned long addr,
	77	unsigned long len, unsigned long pgoff, unsigned long flags)
	78	{
	79	struct vm_area_struct * vmm;
	80	int do_color_align;
	81	unsigned long task_size;
	82
c52d0d30 DD	83	#ifdef CONFIG_32BIT
	84	task_size = TASK_SIZE;
	85	#else /* Must be CONFIG_64BIT*/
	86	task_size = test_thread_flag(TIF_32BIT_ADDR) ? TASK_SIZE32 : TASK_SIZE;
	87	#endif
1da177e4	88
098362e7 DD	89	if (len > task_size)
	90	return -ENOMEM;
	91
1da177e4	92	if (flags & MAP_FIXED) {
098362e7 DD	93	/* Even MAP_FIXED mappings must reside within task_size. */
	94	if (task_size - len < addr)
	95	return -EINVAL;
	96
1da177e4 LT	97	/*
	98	* We do not accept a shared mapping if it would violate
	99	* cache aliasing constraints.
	100	*/
e77414e0 AV	101	if ((flags & MAP_SHARED) &&
e77414e0 AV	102	((addr - (pgoff << PAGE_SHIFT)) & shm_align_mask))
1da177e4 LT	103	return -EINVAL;
	104	return addr;
	105	}
	106
1da177e4 LT	107	do_color_align = 0;
	108	if (filp \|\| (flags & MAP_SHARED))
	109	do_color_align = 1;
	110	if (addr) {
	111	if (do_color_align)
	112	addr = COLOUR_ALIGN(addr, pgoff);
	113	else
	114	addr = PAGE_ALIGN(addr);
	115	vmm = find_vma(current->mm, addr);
	116	if (task_size - len >= addr &&
	117	(!vmm \|\| addr + len <= vmm->vm_start))
	118	return addr;
	119	}
1091458d	120	addr = current->mm->mmap_base;
1da177e4 LT	121	if (do_color_align)
	122	addr = COLOUR_ALIGN(addr, pgoff);
	123	else
	124	addr = PAGE_ALIGN(addr);
	125
	126	for (vmm = find_vma(current->mm, addr); ; vmm = vmm->vm_next) {
	127	/* At this point: (!vmm \|\| addr < vmm->vm_end). */
	128	if (task_size - len < addr)
	129	return -ENOMEM;
	130	if (!vmm \|\| addr + len <= vmm->vm_start)
	131	return addr;
	132	addr = vmm->vm_end;
	133	if (do_color_align)
	134	addr = COLOUR_ALIGN(addr, pgoff);
	135	}
	136	}
	137
1091458d DD	138	void arch_pick_mmap_layout(struct mm_struct *mm)
	139	{
	140	unsigned long random_factor = 0UL;
	141
	142	if (current->flags & PF_RANDOMIZE) {
	143	random_factor = get_random_int();
	144	random_factor = random_factor << PAGE_SHIFT;
	145	if (TASK_IS_32BIT_ADDR)
	146	random_factor &= 0xfffffful;
	147	else
	148	random_factor &= 0xffffffful;
	149	}
	150
	151	mm->mmap_base = TASK_UNMAPPED_BASE + random_factor;
	152	mm->get_unmapped_area = arch_get_unmapped_area;
	153	mm->unmap_area = arch_unmap_area;
	154	}
	155
dbda6ac0 RB	156	SYSCALL_DEFINE6(mips_mmap, unsigned long, addr, unsigned long, len,
	157	unsigned long, prot, unsigned long, flags, unsigned long,
	158	fd, off_t, offset)
1da177e4 LT	159	{
	160	unsigned long result;
	161
	162	result = -EINVAL;
	163	if (offset & ~PAGE_MASK)
	164	goto out;
	165
f8b72560	166	result = sys_mmap_pgoff(addr, len, prot, flags, fd, offset >> PAGE_SHIFT);
1da177e4 LT	167
	168	out:
	169	return result;
	170	}
	171
dbda6ac0 RB	172	SYSCALL_DEFINE6(mips_mmap2, unsigned long, addr, unsigned long, len,
	173	unsigned long, prot, unsigned long, flags, unsigned long, fd,
	174	unsigned long, pgoff)
1da177e4	175	{
947df17c PA	176	if (pgoff & (~PAGE_MASK >> 12))
	177	return -EINVAL;
	178
f8b72560	179	return sys_mmap_pgoff(addr, len, prot, flags, fd, pgoff >> (PAGE_SHIFT-12));
1da177e4 LT	180	}
	181
	182	save_static_function(sys_fork);
f5dbeaf5	183	static int __used noinline
1da177e4 LT	184	_sys_fork(nabi_no_regargs struct pt_regs regs)
	185	{
	186	return do_fork(SIGCHLD, regs.regs[29], &regs, 0, NULL, NULL);
	187	}
	188
	189	save_static_function(sys_clone);
f5dbeaf5	190	static int __used noinline
1da177e4 LT	191	_sys_clone(nabi_no_regargs struct pt_regs regs)
	192	{
	193	unsigned long clone_flags;
	194	unsigned long newsp;
3c37026d	195	int __user parent_tidptr, child_tidptr;
1da177e4 LT	196
	197	clone_flags = regs.regs[4];
	198	newsp = regs.regs[5];
	199	if (!newsp)
	200	newsp = regs.regs[29];
3c37026d RB	201	parent_tidptr = (int __user *) regs.regs[6];
	202	#ifdef CONFIG_32BIT
	203	/* We need to fetch the fifth argument off the stack. */
	204	child_tidptr = NULL;
	205	if (clone_flags & (CLONE_CHILD_SETTID \| CLONE_CHILD_CLEARTID)) {
	206	int __user __user usp = (int __user __user ) regs.regs[29];
	207	if (regs.regs[2] == __NR_syscall) {
	208	if (get_user (child_tidptr, &usp[5]))
	209	return -EFAULT;
	210	}
	211	else if (get_user (child_tidptr, &usp[4]))
	212	return -EFAULT;
	213	}
	214	#else
	215	child_tidptr = (int __user *) regs.regs[8];
	216	#endif
1da177e4 LT	217	return do_fork(clone_flags, newsp, &regs, 0,
	218	parent_tidptr, child_tidptr);
	219	}
	220
	221	/*
	222	* sys_execve() executes a new program.
	223	*/
	224	asmlinkage int sys_execve(nabi_no_regargs struct pt_regs regs)
	225	{
	226	int error;
	227	char * filename;
	228
be6e518b	229	filename = getname((char __user *) (long)regs.regs[4]);
1da177e4 LT	230	error = PTR_ERR(filename);
	231	if (IS_ERR(filename))
	232	goto out;
be6e518b AN	233	error = do_execve(filename, (char __user __user ) (long)regs.regs[5],
be6e518b AN	234	(char __user __user ) (long)regs.regs[6], &regs);
1da177e4 LT	235	putname(filename);
	236
	237	out:
	238	return error;
	239	}
	240
dbda6ac0	241	SYSCALL_DEFINE1(set_thread_area, unsigned long, addr)
3c37026d	242	{
dc8f6029	243	struct thread_info *ti = task_thread_info(current);
3c37026d RB	244
3c37026d RB	245	ti->tp_value = addr;
a3692020 RB	246	if (cpu_has_userlocal)
a3692020 RB	247	write_c0_userlocal(addr);
06be375b RB	248
06be375b RB	249	return 0;
3c37026d RB	250	}
3c37026d RB	251
f1e39a4a RB	252	static inline int mips_atomic_set(struct pt_regs *regs,
f1e39a4a RB	253	unsigned long addr, unsigned long new)
1da177e4	254	{
f1e39a4a RB	255	unsigned long old, tmp;
	256	unsigned int err;
	257
	258	if (unlikely(addr & 3))
	259	return -EINVAL;
	260
	261	if (unlikely(!access_ok(VERIFY_WRITE, addr, 4)))
	262	return -EINVAL;
	263
	264	if (cpu_has_llsc && R10000_LLSC_WAR) {
	265	__asm__ __volatile__ (
a91be9ee	266	" .set mips3 \n"
f1e39a4a RB	267	" li %[err], 0 \n"
	268	"1: ll %[old], (%[addr]) \n"
	269	" move %[tmp], %[new] \n"
	270	"2: sc %[tmp], (%[addr]) \n"
	271	" beqzl %[tmp], 1b \n"
	272	"3: \n"
	273	" .section .fixup,\"ax\" \n"
	274	"4: li %[err], %[efault] \n"
	275	" j 3b \n"
	276	" .previous \n"
	277	" .section __ex_table,\"a\" \n"
	278	" "STR(PTR)" 1b, 4b \n"
	279	" "STR(PTR)" 2b, 4b \n"
	280	" .previous \n"
a91be9ee	281	" .set mips0 \n"
f1e39a4a RB	282	: [old] "=&r" (old),
	283	[err] "=&r" (err),
	284	[tmp] "=&r" (tmp)
	285	: [addr] "r" (addr),
	286	[new] "r" (new),
	287	[efault] "i" (-EFAULT)
	288	: "memory");
	289	} else if (cpu_has_llsc) {
	290	__asm__ __volatile__ (
a91be9ee	291	" .set mips3 \n"
f1e39a4a RB	292	" li %[err], 0 \n"
	293	"1: ll %[old], (%[addr]) \n"
	294	" move %[tmp], %[new] \n"
	295	"2: sc %[tmp], (%[addr]) \n"
	296	" bnez %[tmp], 4f \n"
	297	"3: \n"
	298	" .subsection 2 \n"
	299	"4: b 1b \n"
	300	" .previous \n"
	301	" \n"
	302	" .section .fixup,\"ax\" \n"
	303	"5: li %[err], %[efault] \n"
	304	" j 3b \n"
	305	" .previous \n"
	306	" .section __ex_table,\"a\" \n"
	307	" "STR(PTR)" 1b, 5b \n"
	308	" "STR(PTR)" 2b, 5b \n"
	309	" .previous \n"
a91be9ee	310	" .set mips0 \n"
f1e39a4a RB	311	: [old] "=&r" (old),
	312	[err] "=&r" (err),
	313	[tmp] "=&r" (tmp)
	314	: [addr] "r" (addr),
	315	[new] "r" (new),
	316	[efault] "i" (-EFAULT)
	317	: "memory");
	318	} else {
	319	do {
	320	preempt_disable();
	321	ll_bit = 1;
	322	ll_task = current;
	323	preempt_enable();
	324
	325	err = __get_user(old, (unsigned int *) addr);
	326	err \|= __put_user(new, (unsigned int *) addr);
	327	if (err)
	328	break;
	329	rmb();
	330	} while (!ll_bit);
	331	}
	332
	333	if (unlikely(err))
	334	return err;
	335
	336	regs->regs[2] = old;
	337	regs->regs[7] = 0; /* No error */
	338
	339	/*
	340	* Don't let your children do this ...
	341	*/
	342	__asm__ __volatile__(
	343	" move $29, %0 \n"
	344	" j syscall_exit \n"
	345	: /* no outputs */
	346	: "r" (regs));
	347
	348	/* unreached. Honestly. */
	349	while (1);
	350	}
	351
	352	save_static_function(sys_sysmips);
	353	static int __used noinline
	354	_sys_sysmips(nabi_no_regargs struct pt_regs regs)
	355	{
	356	long cmd, arg1, arg2, arg3;
	357
	358	cmd = regs.regs[4];
	359	arg1 = regs.regs[5];
	360	arg2 = regs.regs[6];
	361	arg3 = regs.regs[7];
	362
293c5bd1	363	switch (cmd) {
1da177e4	364	case MIPS_ATOMIC_SET:
f1e39a4a	365	return mips_atomic_set(&regs, arg1, arg2);
1da177e4 LT	366
1da177e4 LT	367	case MIPS_FIXADE:
293c5bd1 RB	368	if (arg1 & ~3)
	369	return -EINVAL;
	370
	371	if (arg1 & 1)
	372	set_thread_flag(TIF_FIXADE);
	373	else
	374	clear_thread_flag(TIF_FIXADE);
	375	if (arg1 & 2)
	376	set_thread_flag(TIF_LOGADE);
	377	else
	378	clear_thread_flag(TIF_FIXADE);
	379
1da177e4 LT	380	return 0;
	381
	382	case FLUSH_CACHE:
	383	__flush_cache_all();
	384	return 0;
1da177e4 LT	385	}
	386
	387	return -EINVAL;
	388	}
	389
1da177e4 LT	390	/*
	391	* No implemented yet ...
	392	*/
dbda6ac0	393	SYSCALL_DEFINE3(cachectl, char *, addr, int, nbytes, int, op)
1da177e4 LT	394	{
	395	return -ENOSYS;
	396	}
	397
	398	/*
	399	* If we ever come here the user sp is bad. Zap the process right away.
	400	* Due to the bad stack signaling wouldn't work.
	401	*/
	402	asmlinkage void bad_stack(void)
	403	{
	404	do_exit(SIGSEGV);
	405	}
fe74290d AB	406
	407	/*
	408	* Do a system call from kernel instead of calling sys_execve so we
	409	* end up with proper pt_regs.
	410	*/
	411	int kernel_execve(const char filename, char const argv[], char *const envp[])
	412	{
	413	register unsigned long __a0 asm("$4") = (unsigned long) filename;
	414	register unsigned long __a1 asm("$5") = (unsigned long) argv;
	415	register unsigned long __a2 asm("$6") = (unsigned long) envp;
	416	register unsigned long __a3 asm("$7");
	417	unsigned long __v0;
	418
	419	__asm__ volatile (" \n"
	420	" .set noreorder \n"
	421	" li $2, %5 # __NR_execve \n"
	422	" syscall \n"
	423	" move %0, $2 \n"
	424	" .set reorder \n"
	425	: "=&r" (__v0), "=r" (__a3)
	426	: "r" (__a0), "r" (__a1), "r" (__a2), "i" (__NR_execve)
	427	: "$2", "$8", "$9", "$10", "$11", "$12", "$13", "$14", "$15", "$24",
	428	"memory");
	429
	430	if (__a3 == 0)
	431	return __v0;
	432
	433	return -__v0;
	434	}