[mirror_ubuntu-hirsute-kernel.git] / arch / x86_64 / kernel / sys_x86_64.c

/*
 * linux/arch/x86_64/kernel/sys_x86_64.c
 */

#include <linux/errno.h>
#include <linux/sched.h>
#include <linux/syscalls.h>
#include <linux/mm.h>
#include <linux/smp.h>
#include <linux/smp_lock.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;
	
	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	/*
	2	* linux/arch/x86_64/kernel/sys_x86_64.c
	3	*/
	4
	5	#include <linux/errno.h>
	6	#include <linux/sched.h>
	7	#include <linux/syscalls.h>
	8	#include <linux/mm.h>
	9	#include <linux/smp.h>
	10	#include <linux/smp_lock.h>
	11	#include <linux/sem.h>
	12	#include <linux/msg.h>
	13	#include <linux/shm.h>
	14	#include <linux/stat.h>
	15	#include <linux/mman.h>
	16	#include <linux/file.h>
	17	#include <linux/utsname.h>
	18	#include <linux/personality.h>
	19
	20	#include <asm/uaccess.h>
	21	#include <asm/ia32.h>
	22
	23	/*
	24	* sys_pipe() is the normal C calling standard for creating
	25	* a pipe. It's not the way Unix traditionally does this, though.
	26	*/
	27	asmlinkage long sys_pipe(int __user *fildes)
	28	{
	29	int fd[2];
	30	int error;
	31
	32	error = do_pipe(fd);
	33	if (!error) {
	34	if (copy_to_user(fildes, fd, 2*sizeof(int)))
	35	error = -EFAULT;
	36	}
	37	return error;
	38	}
	39
	40	asmlinkage long sys_mmap(unsigned long addr, unsigned long len, unsigned long prot, unsigned long flags,
	41	unsigned long fd, unsigned long off)
	42	{
	43	long error;
	44	struct file * file;
	45
	46	error = -EINVAL;
	47	if (off & ~PAGE_MASK)
	48	goto out;
	49
	50	error = -EBADF;
	51	file = NULL;
	52	flags &= ~(MAP_EXECUTABLE \| MAP_DENYWRITE);
	53	if (!(flags & MAP_ANONYMOUS)) {
	54	file = fget(fd);
	55	if (!file)
	56	goto out;
	57	}
	58	down_write(&current->mm->mmap_sem);
	59	error = do_mmap_pgoff(file, addr, len, prot, flags, off >> PAGE_SHIFT);
	60	up_write(&current->mm->mmap_sem);
	61
	62	if (file)
	63	fput(file);
	64	out:
65	return error;
66	}
67
68	static void find_start_end(unsigned long flags, unsigned long *begin,
69	unsigned long *end)
70	{
84929801	71	if (!test_thread_flag(TIF_IA32) && (flags & MAP_32BIT)) {
1da177e4 LT	72	/* This is usually used needed to map code in small
	73	model, so it needs to be in the first 31bit. Limit
	74	it to that. This means we need to move the
	75	unmapped base down for this case. This can give
	76	conflicts with the heap, but we assume that glibc
	77	malloc knows how to fall back to mmap. Give it 1GB
	78	of playground for now. -AK */
	79	*begin = 0x40000000;
	80	*end = 0x80000000;
84929801 SS	81	} else {
84929801 SS	82	*begin = TASK_UNMAPPED_BASE;
1da177e4	83	*end = TASK_SIZE;
84929801	84	}
1da177e4 LT	85	}
	86
	87	unsigned long
	88	arch_get_unmapped_area(struct file *filp, unsigned long addr,
	89	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 start_addr;
	94	unsigned long begin, end;
	95
	96	find_start_end(flags, &begin, &end);
	97
	98	if (len > end)
	99	return -ENOMEM;
	100
	101	if (addr) {
	102	addr = PAGE_ALIGN(addr);
	103	vma = find_vma(mm, addr);
	104	if (end - len >= addr &&
	105	(!vma \|\| addr + len <= vma->vm_start))
	106	return addr;
	107	}
1363c3cd WW	108	if (((flags & MAP_32BIT) \|\| test_thread_flag(TIF_IA32))
	109	&& len <= mm->cached_hole_size) {
	110	mm->cached_hole_size = 0;
	111	mm->free_area_cache = begin;
	112	}
1da177e4 LT	113	addr = mm->free_area_cache;
	114	if (addr < begin)
	115	addr = begin;
	116	start_addr = addr;
	117
	118	full_search:
	119	for (vma = find_vma(mm, addr); ; vma = vma->vm_next) {
	120	/* At this point: (!vma \|\| addr < vma->vm_end). */
	121	if (end - len < addr) {
	122	/*
	123	* Start a new search - just in case we missed
	124	* some holes.
	125	*/
	126	if (start_addr != begin) {
	127	start_addr = addr = begin;
1363c3cd	128	mm->cached_hole_size = 0;
1da177e4 LT	129	goto full_search;
	130	}
	131	return -ENOMEM;
	132	}
	133	if (!vma \|\| addr + len <= vma->vm_start) {
	134	/*
	135	* Remember the place where we stopped the search:
	136	*/
	137	mm->free_area_cache = addr + len;
	138	return addr;
	139	}
1363c3cd WW	140	if (addr + mm->cached_hole_size < vma->vm_start)
	141	mm->cached_hole_size = vma->vm_start - addr;
	142
1da177e4 LT	143	addr = vma->vm_end;
	144	}
	145	}
	146
	147	asmlinkage long sys_uname(struct new_utsname __user * name)
	148	{
	149	int err;
	150	down_read(&uts_sem);
e9ff3990	151	err = copy_to_user(name, utsname(), sizeof (*name));
1da177e4 LT	152	up_read(&uts_sem);
	153	if (personality(current->personality) == PER_LINUX32)
	154	err \|= copy_to_user(&name->machine, "i686", 5);
	155	return err ? -EFAULT : 0;
	156	}