[net-next-2.6.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 <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;

	task_size = STACK_TOP;

	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 = TASK_UNMAPPED_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);
	}
}

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