[GitHub/mt8127/android_kernel_alcatel_ttab.git] / arch / x86 / kernel / sys_x86_64.c

#include <linux/errno.h>
#include <linux/sched.h>
#include <linux/syscalls.h>
#include <linux/mm.h>
#include <linux/fs.h>
#include <linux/smp.h>
#include <linux/sem.h>
#include <linux/msg.h>
#include <linux/shm.h>
#include <linux/stat.h>
#include <linux/mman.h>
#include <linux/file.h>
#include <linux/utsname.h>
#include <linux/personality.h>

#include <asm/uaccess.h>
#include <asm/ia32.h>

/*
 * sys_pipe() is the normal C calling standard for creating
 * a pipe. It's not the way Unix traditionally does this, though.
 */
asmlinkage long sys_pipe(int __user *fildes)
{
	int fd[2];
	int error;

	error = do_pipe(fd);
	if (!error) {
		if (copy_to_user(fildes, fd, 2*sizeof(int)))
			error = -EFAULT;
	}
	return error;
}

asmlinkage long sys_mmap(unsigned long addr, unsigned long len, unsigned long prot, unsigned long flags,
	unsigned long fd, unsigned long off)
{
	long error;
	struct file * file;

	error = -EINVAL;
	if (off & ~PAGE_MASK)
		goto out;

	error = -EBADF;
	file = NULL;
	flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE);
	if (!(flags & MAP_ANONYMOUS)) {
		file = fget(fd);
		if (!file)
			goto out;
	}
	down_write(&current->mm->mmap_sem);
	error = do_mmap_pgoff(file, addr, len, prot, flags, off >> PAGE_SHIFT);
	up_write(&current->mm->mmap_sem);

	if (file)
		fput(file);
out:
	return error;
}

static void find_start_end(unsigned long flags, unsigned long *begin,
			   unsigned long *end)
{
	if (!test_thread_flag(TIF_IA32) && (flags & MAP_32BIT)) {
		/* This is usually used needed to map code in small
		   model, so it needs to be in the first 31bit. Limit
		   it to that.  This means we need to move the
		   unmapped base down for this case. This can give
		   conflicts with the heap, but we assume that glibc
		   malloc knows how to fall back to mmap. Give it 1GB
		   of playground for now. -AK */ 
		*begin = 0x40000000; 
		*end = 0x80000000;		
	} else {
		*begin = TASK_UNMAPPED_BASE;
		*end = TASK_SIZE; 
	}
} 

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 start_addr;
	unsigned long begin, end;
	
	if (flags & MAP_FIXED)
		return addr;

	find_start_end(flags, &begin, &end); 

	if (len > end)
		return -ENOMEM;

	if (addr) {
		addr = PAGE_ALIGN(addr);
		vma = find_vma(mm, addr);
		if (end - len >= addr &&
		    (!vma || addr + len <= vma->vm_start))
			return addr;
	}
	if (((flags & MAP_32BIT) || test_thread_flag(TIF_IA32))
	    && len <= mm->cached_hole_size) {
	        mm->cached_hole_size = 0;
		mm->free_area_cache = begin;
	}
	addr = mm->free_area_cache;
	if (addr < begin) 
		addr = begin; 
	start_addr = addr;

full_search:
	for (vma = find_vma(mm, addr); ; vma = vma->vm_next) {
		/* At this point:  (!vma || addr < vma->vm_end). */
		if (end - len < addr) {
			/*
			 * Start a new search - just in case we missed
			 * some holes.
			 */
			if (start_addr != begin) {
				start_addr = addr = begin;
				mm->cached_hole_size = 0;
				goto full_search;
			}
			return -ENOMEM;
		}
		if (!vma || addr + len <= vma->vm_start) {
			/*
			 * Remember the place where we stopped the search:
			 */
			mm->free_area_cache = addr + len;
			return addr;
		}
		if (addr + mm->cached_hole_size < vma->vm_start)
		        mm->cached_hole_size = vma->vm_start - addr;

		addr = vma->vm_end;
	}
}

asmlinkage long sys_uname(struct new_utsname __user * name)
{
	int err;
	down_read(&uts_sem);
	err = copy_to_user(name, utsname(), sizeof (*name));
	up_read(&uts_sem);
	if (personality(current->personality) == PER_LINUX32) 
		err |= copy_to_user(&name->machine, "i686", 5); 		
	return err ? -EFAULT : 0;
}
Commit	Line	Data
1da177e4 LT	1	#include <linux/errno.h>
	2	#include <linux/sched.h>
	3	#include <linux/syscalls.h>
	4	#include <linux/mm.h>
4e950f6f	5	#include <linux/fs.h>
1da177e4	6	#include <linux/smp.h>
1da177e4 LT	7	#include <linux/sem.h>
	8	#include <linux/msg.h>
	9	#include <linux/shm.h>
	10	#include <linux/stat.h>
	11	#include <linux/mman.h>
	12	#include <linux/file.h>
	13	#include <linux/utsname.h>
	14	#include <linux/personality.h>
	15
	16	#include <asm/uaccess.h>
	17	#include <asm/ia32.h>
	18
	19	/*
	20	* sys_pipe() is the normal C calling standard for creating
	21	* a pipe. It's not the way Unix traditionally does this, though.
	22	*/
	23	asmlinkage long sys_pipe(int __user *fildes)
	24	{
	25	int fd[2];
	26	int error;
	27
	28	error = do_pipe(fd);
	29	if (!error) {
	30	if (copy_to_user(fildes, fd, 2*sizeof(int)))
	31	error = -EFAULT;
	32	}
	33	return error;
	34	}
	35
	36	asmlinkage long sys_mmap(unsigned long addr, unsigned long len, unsigned long prot, unsigned long flags,
	37	unsigned long fd, unsigned long off)
	38	{
	39	long error;
	40	struct file * file;
	41
	42	error = -EINVAL;
	43	if (off & ~PAGE_MASK)
	44	goto out;
	45
	46	error = -EBADF;
	47	file = NULL;
	48	flags &= ~(MAP_EXECUTABLE \| MAP_DENYWRITE);
	49	if (!(flags & MAP_ANONYMOUS)) {
	50	file = fget(fd);
	51	if (!file)
	52	goto out;
	53	}
	54	down_write(&current->mm->mmap_sem);
	55	error = do_mmap_pgoff(file, addr, len, prot, flags, off >> PAGE_SHIFT);
	56	up_write(&current->mm->mmap_sem);
	57
	58	if (file)
	59	fput(file);
	60	out:
	61	return error;
	62	}
	63
	64	static void find_start_end(unsigned long flags, unsigned long *begin,
	65	unsigned long *end)
	66	{
84929801	67	if (!test_thread_flag(TIF_IA32) && (flags & MAP_32BIT)) {
1da177e4 LT	68	/* This is usually used needed to map code in small
	69	model, so it needs to be in the first 31bit. Limit
	70	it to that. This means we need to move the
	71	unmapped base down for this case. This can give
	72	conflicts with the heap, but we assume that glibc
	73	malloc knows how to fall back to mmap. Give it 1GB
	74	of playground for now. -AK */
	75	*begin = 0x40000000;
	76	*end = 0x80000000;
84929801 SS	77	} else {
84929801 SS	78	*begin = TASK_UNMAPPED_BASE;
1da177e4	79	*end = TASK_SIZE;
84929801	80	}
1da177e4 LT	81	}
	82
	83	unsigned long
	84	arch_get_unmapped_area(struct file *filp, unsigned long addr,
	85	unsigned long len, unsigned long pgoff, unsigned long flags)
	86	{
	87	struct mm_struct *mm = current->mm;
	88	struct vm_area_struct *vma;
	89	unsigned long start_addr;
	90	unsigned long begin, end;
	91
11300a64 BH	92	if (flags & MAP_FIXED)
	93	return addr;
	94
1da177e4 LT	95	find_start_end(flags, &begin, &end);
	96
	97	if (len > end)
	98	return -ENOMEM;
	99
	100	if (addr) {
	101	addr = PAGE_ALIGN(addr);
	102	vma = find_vma(mm, addr);
	103	if (end - len >= addr &&
	104	(!vma \|\| addr + len <= vma->vm_start))
	105	return addr;
	106	}
1363c3cd WW	107	if (((flags & MAP_32BIT) \|\| test_thread_flag(TIF_IA32))
	108	&& len <= mm->cached_hole_size) {
	109	mm->cached_hole_size = 0;
	110	mm->free_area_cache = begin;
	111	}
1da177e4 LT	112	addr = mm->free_area_cache;
	113	if (addr < begin)
	114	addr = begin;
	115	start_addr = addr;
	116
	117	full_search:
	118	for (vma = find_vma(mm, addr); ; vma = vma->vm_next) {
	119	/* At this point: (!vma \|\| addr < vma->vm_end). */
	120	if (end - len < addr) {
	121	/*
	122	* Start a new search - just in case we missed
	123	* some holes.
	124	*/
	125	if (start_addr != begin) {
	126	start_addr = addr = begin;
1363c3cd	127	mm->cached_hole_size = 0;
1da177e4 LT	128	goto full_search;
	129	}
	130	return -ENOMEM;
	131	}
	132	if (!vma \|\| addr + len <= vma->vm_start) {
	133	/*
	134	* Remember the place where we stopped the search:
	135	*/
	136	mm->free_area_cache = addr + len;
	137	return addr;
	138	}
1363c3cd WW	139	if (addr + mm->cached_hole_size < vma->vm_start)
	140	mm->cached_hole_size = vma->vm_start - addr;
	141
1da177e4 LT	142	addr = vma->vm_end;
	143	}
	144	}
	145
	146	asmlinkage long sys_uname(struct new_utsname __user * name)
	147	{
	148	int err;
	149	down_read(&uts_sem);
e9ff3990	150	err = copy_to_user(name, utsname(), sizeof (*name));
1da177e4 LT	151	up_read(&uts_sem);
	152	if (personality(current->personality) == PER_LINUX32)
	153	err \|= copy_to_user(&name->machine, "i686", 5);
	154	return err ? -EFAULT : 0;
	155	}