[linux-2.6-block.git] / arch / mips / kernel / linux32.c

/*
 * Conversion between 32-bit and 64-bit native system calls.
 *
 * Copyright (C) 2000 Silicon Graphics, Inc.
 * Written by Ulf Carlsson (ulfc@engr.sgi.com)
 */
#include <linux/compiler.h>
#include <linux/mm.h>
#include <linux/errno.h>
#include <linux/file.h>
#include <linux/highuid.h>
#include <linux/resource.h>
#include <linux/highmem.h>
#include <linux/time.h>
#include <linux/times.h>
#include <linux/poll.h>
#include <linux/skbuff.h>
#include <linux/filter.h>
#include <linux/shm.h>
#include <linux/sem.h>
#include <linux/msg.h>
#include <linux/icmpv6.h>
#include <linux/syscalls.h>
#include <linux/sysctl.h>
#include <linux/utime.h>
#include <linux/utsname.h>
#include <linux/personality.h>
#include <linux/dnotify.h>
#include <linux/module.h>
#include <linux/binfmts.h>
#include <linux/security.h>
#include <linux/compat.h>
#include <linux/vfs.h>
#include <linux/ipc.h>
#include <linux/slab.h>

#include <net/sock.h>
#include <net/scm.h>

#include <asm/compat-signal.h>
#include <asm/sim.h>
#include <asm/uaccess.h>
#include <asm/mmu_context.h>
#include <asm/mman.h>

/* Use this to get at 32-bit user passed pointers. */
/* A() macro should be used for places where you e.g.
   have some internal variable u32 and just want to get
   rid of a compiler warning. AA() has to be used in
   places where you want to convert a function argument
   to 32bit pointer or when you e.g. access pt_regs
   structure and want to consider 32bit registers only.
 */
#define A(__x) ((unsigned long)(__x))
#define AA(__x) ((unsigned long)((int)__x))

#ifdef __MIPSEB__
#define merge_64(r1, r2) ((((r1) & 0xffffffffUL) << 32) + ((r2) & 0xffffffffUL))
#endif
#ifdef __MIPSEL__
#define merge_64(r1, r2) ((((r2) & 0xffffffffUL) << 32) + ((r1) & 0xffffffffUL))
#endif

SYSCALL_DEFINE6(32_mmap2, unsigned long, addr, unsigned long, len,
	unsigned long, prot, unsigned long, flags, unsigned long, fd,
	unsigned long, pgoff)
{
	unsigned long error;

	error = -EINVAL;
	if (pgoff & (~PAGE_MASK >> 12))
		goto out;
	error = sys_mmap_pgoff(addr, len, prot, flags, fd,
			       pgoff >> (PAGE_SHIFT-12));
out:
	return error;
}

#define RLIM_INFINITY32 0x7fffffff
#define RESOURCE32(x) ((x > RLIM_INFINITY32) ? RLIM_INFINITY32 : x)

struct rlimit32 {
	int	rlim_cur;
	int	rlim_max;
};

SYSCALL_DEFINE4(32_truncate64, const char __user *, path,
	unsigned long, __dummy, unsigned long, a2, unsigned long, a3)
{
	return sys_truncate(path, merge_64(a2, a3));
}

SYSCALL_DEFINE4(32_ftruncate64, unsigned long, fd, unsigned long, __dummy,
	unsigned long, a2, unsigned long, a3)
{
	return sys_ftruncate(fd, merge_64(a2, a3));
}

SYSCALL_DEFINE5(32_llseek, unsigned int, fd, unsigned int, offset_high,
		unsigned int, offset_low, loff_t __user *, result,
		unsigned int, origin)
{
	return sys_llseek(fd, offset_high, offset_low, result, origin);
}

/* From the Single Unix Spec: pread & pwrite act like lseek to pos + op +
   lseek back to original location.  They fail just like lseek does on
   non-seekable files.	*/

SYSCALL_DEFINE6(32_pread, unsigned long, fd, char __user *, buf, size_t, count,
	unsigned long, unused, unsigned long, a4, unsigned long, a5)
{
	return sys_pread64(fd, buf, count, merge_64(a4, a5));
}

SYSCALL_DEFINE6(32_pwrite, unsigned int, fd, const char __user *, buf,
	size_t, count, u32, unused, u64, a4, u64, a5)
{
	return sys_pwrite64(fd, buf, count, merge_64(a4, a5));
}

#ifdef CONFIG_SYSVIPC

SYSCALL_DEFINE6(32_ipc, u32, call, long, first, long, second, long, third,
	unsigned long, ptr, unsigned long, fifth)
{
	int version, err;

	version = call >> 16; /* hack for backward compatibility */
	call &= 0xffff;

	switch (call) {
	case SEMOP:
		/* struct sembuf is the same on 32 and 64bit :)) */
		err = sys_semtimedop(first, compat_ptr(ptr), second, NULL);
		break;
	case SEMTIMEDOP:
		err = compat_sys_semtimedop(first, compat_ptr(ptr), second,
					    compat_ptr(fifth));
		break;
	case SEMGET:
		err = sys_semget(first, second, third);
		break;
	case SEMCTL:
		err = compat_sys_semctl(first, second, third, compat_ptr(ptr));
		break;
	case MSGSND:
		err = compat_sys_msgsnd(first, second, third, compat_ptr(ptr));
		break;
	case MSGRCV:
		err = compat_sys_msgrcv(first, second, fifth, third,
					version, compat_ptr(ptr));
		break;
	case MSGGET:
		err = sys_msgget((key_t) first, second);
		break;
	case MSGCTL:
		err = compat_sys_msgctl(first, second, compat_ptr(ptr));
		break;
	case SHMAT:
		err = compat_sys_shmat(first, second, third, version,
				       compat_ptr(ptr));
		break;
	case SHMDT:
		err = sys_shmdt(compat_ptr(ptr));
		break;
	case SHMGET:
		err = sys_shmget(first, (unsigned)second, third);
		break;
	case SHMCTL:
		err = compat_sys_shmctl(first, second, compat_ptr(ptr));
		break;
	default:
		err = -EINVAL;
		break;
	}

	return err;
}

#else

SYSCALL_DEFINE6(32_ipc, u32, call, int, first, int, second, int, third,
	u32, ptr, u32, fifth)
{
	return -ENOSYS;
}

#endif /* CONFIG_SYSVIPC */

#ifdef CONFIG_MIPS32_N32
SYSCALL_DEFINE4(n32_semctl, int, semid, int, semnum, int, cmd, u32, arg)
{
	/* compat_sys_semctl expects a pointer to union semun */
	u32 __user *uptr = compat_alloc_user_space(sizeof(u32));
	if (put_user(arg, uptr))
		return -EFAULT;
	return compat_sys_semctl(semid, semnum, cmd, uptr);
}

SYSCALL_DEFINE4(n32_msgsnd, int, msqid, u32, msgp, unsigned int, msgsz,
	int, msgflg)
{
	return compat_sys_msgsnd(msqid, msgsz, msgflg, compat_ptr(msgp));
}

SYSCALL_DEFINE5(n32_msgrcv, int, msqid, u32, msgp, size_t, msgsz,
	int, msgtyp, int, msgflg)
{
	return compat_sys_msgrcv(msqid, msgsz, msgtyp, msgflg, IPC_64,
				 compat_ptr(msgp));
}
#endif

SYSCALL_DEFINE1(32_personality, unsigned long, personality)
{
	unsigned int p = personality & 0xffffffff;
	int ret;

	if (personality(current->personality) == PER_LINUX32 &&
	    personality(p) == PER_LINUX)
		p = (p & ~PER_MASK) | PER_LINUX32;
	ret = sys_personality(p);
	if (ret != -1 && personality(ret) == PER_LINUX32)
		ret = (ret & ~PER_MASK) | PER_LINUX;
	return ret;
}

asmlinkage ssize_t sys32_readahead(int fd, u32 pad0, u64 a2, u64 a3,
				   size_t count)
{
	return sys_readahead(fd, merge_64(a2, a3), count);
}

asmlinkage long sys32_sync_file_range(int fd, int __pad,
	unsigned long a2, unsigned long a3,
	unsigned long a4, unsigned long a5,
	int flags)
{
	return sys_sync_file_range(fd,
			merge_64(a2, a3), merge_64(a4, a5),
			flags);
}

asmlinkage long sys32_fadvise64_64(int fd, int __pad,
	unsigned long a2, unsigned long a3,
	unsigned long a4, unsigned long a5,
	int flags)
{
	return sys_fadvise64_64(fd,
			merge_64(a2, a3), merge_64(a4, a5),
			flags);
}

asmlinkage long sys32_fallocate(int fd, int mode, unsigned offset_a2,
	unsigned offset_a3, unsigned len_a4, unsigned len_a5)
{
	return sys_fallocate(fd, mode, merge_64(offset_a2, offset_a3),
			     merge_64(len_a4, len_a5));
}

asmlinkage long sys32_lookup_dcookie(u32 a0, u32 a1, char __user *buf,
	size_t len)
{
	return sys_lookup_dcookie(merge_64(a0, a1), buf, len);
}

SYSCALL_DEFINE6(32_fanotify_mark, int, fanotify_fd, unsigned int, flags,
		u64, a3, u64, a4, int, dfd, const char	__user *, pathname)
{
	return sys_fanotify_mark(fanotify_fd, flags, merge_64(a3, a4),
				 dfd, pathname);
}
Commit	Line	Data
1da177e4 LT	1	/*
	2	* Conversion between 32-bit and 64-bit native system calls.
	3	*
	4	* Copyright (C) 2000 Silicon Graphics, Inc.
	5	* Written by Ulf Carlsson (ulfc@engr.sgi.com)
1da177e4	6	*/
1da177e4 LT	7	#include <linux/compiler.h>
	8	#include <linux/mm.h>
	9	#include <linux/errno.h>
	10	#include <linux/file.h>
1da177e4	11	#include <linux/highuid.h>
1da177e4 LT	12	#include <linux/resource.h>
	13	#include <linux/highmem.h>
	14	#include <linux/time.h>
	15	#include <linux/times.h>
	16	#include <linux/poll.h>
1da177e4 LT	17	#include <linux/skbuff.h>
	18	#include <linux/filter.h>
	19	#include <linux/shm.h>
	20	#include <linux/sem.h>
	21	#include <linux/msg.h>
	22	#include <linux/icmpv6.h>
	23	#include <linux/syscalls.h>
	24	#include <linux/sysctl.h>
	25	#include <linux/utime.h>
	26	#include <linux/utsname.h>
	27	#include <linux/personality.h>
1da177e4 LT	28	#include <linux/dnotify.h>
	29	#include <linux/module.h>
	30	#include <linux/binfmts.h>
	31	#include <linux/security.h>
	32	#include <linux/compat.h>
	33	#include <linux/vfs.h>
cba4fbbf	34	#include <linux/ipc.h>
5a0e3ad6	35	#include <linux/slab.h>
1da177e4 LT	36
	37	#include <net/sock.h>
	38	#include <net/scm.h>
	39
431dc804	40	#include <asm/compat-signal.h>
1da177e4 LT	41	#include <asm/sim.h>
	42	#include <asm/uaccess.h>
	43	#include <asm/mmu_context.h>
	44	#include <asm/mman.h>
	45
	46	/* Use this to get at 32-bit user passed pointers. */
	47	/* A() macro should be used for places where you e.g.
	48	have some internal variable u32 and just want to get
	49	rid of a compiler warning. AA() has to be used in
	50	places where you want to convert a function argument
	51	to 32bit pointer or when you e.g. access pt_regs
	52	structure and want to consider 32bit registers only.
	53	*/
	54	#define A(__x) ((unsigned long)(__x))
	55	#define AA(__x) ((unsigned long)((int)__x))
	56
	57	#ifdef __MIPSEB__
21a151d8	58	#define merge_64(r1, r2) ((((r1) & 0xffffffffUL) << 32) + ((r2) & 0xffffffffUL))
1da177e4 LT	59	#endif
1da177e4 LT	60	#ifdef __MIPSEL__
21a151d8	61	#define merge_64(r1, r2) ((((r2) & 0xffffffffUL) << 32) + ((r1) & 0xffffffffUL))
1da177e4 LT	62	#endif
1da177e4 LT	63
dbda6ac0 RB	64	SYSCALL_DEFINE6(32_mmap2, unsigned long, addr, unsigned long, len,
	65	unsigned long, prot, unsigned long, flags, unsigned long, fd,
	66	unsigned long, pgoff)
1da177e4	67	{
1da177e4 LT	68	unsigned long error;
	69
	70	error = -EINVAL;
947df17c PA	71	if (pgoff & (~PAGE_MASK >> 12))
947df17c PA	72	goto out;
f8b72560 AV	73	error = sys_mmap_pgoff(addr, len, prot, flags, fd,
f8b72560 AV	74	pgoff >> (PAGE_SHIFT-12));
1da177e4 LT	75	out:
	76	return error;
	77	}
	78
70342287	79	#define RLIM_INFINITY32 0x7fffffff
1da177e4 LT	80	#define RESOURCE32(x) ((x > RLIM_INFINITY32) ? RLIM_INFINITY32 : x)
	81
	82	struct rlimit32 {
	83	int rlim_cur;
	84	int rlim_max;
	85	};
	86
dbda6ac0 RB	87	SYSCALL_DEFINE4(32_truncate64, const char __user *, path,
dbda6ac0 RB	88	unsigned long, __dummy, unsigned long, a2, unsigned long, a3)
1da177e4	89	{
d4e9cffa	90	return sys_truncate(path, merge_64(a2, a3));
1da177e4 LT	91	}
1da177e4 LT	92
dbda6ac0 RB	93	SYSCALL_DEFINE4(32_ftruncate64, unsigned long, fd, unsigned long, __dummy,
dbda6ac0 RB	94	unsigned long, a2, unsigned long, a3)
1da177e4	95	{
d4e9cffa	96	return sys_ftruncate(fd, merge_64(a2, a3));
1da177e4 LT	97	}
1da177e4 LT	98
d6c178e9 RB	99	SYSCALL_DEFINE5(32_llseek, unsigned int, fd, unsigned int, offset_high,
	100	unsigned int, offset_low, loff_t __user *, result,
	101	unsigned int, origin)
1da177e4 LT	102	{
	103	return sys_llseek(fd, offset_high, offset_low, result, origin);
	104	}
	105
	106	/* From the Single Unix Spec: pread & pwrite act like lseek to pos + op +
	107	lseek back to original location. They fail just like lseek does on
70342287	108	non-seekable files. */
1da177e4	109
dbda6ac0 RB	110	SYSCALL_DEFINE6(32_pread, unsigned long, fd, char __user *, buf, size_t, count,
dbda6ac0 RB	111	unsigned long, unused, unsigned long, a4, unsigned long, a5)
1da177e4	112	{
6ad0013b	113	return sys_pread64(fd, buf, count, merge_64(a4, a5));
1da177e4 LT	114	}
1da177e4 LT	115
dbda6ac0 RB	116	SYSCALL_DEFINE6(32_pwrite, unsigned int, fd, const char __user *, buf,
dbda6ac0 RB	117	size_t, count, u32, unused, u64, a4, u64, a5)
1da177e4	118	{
6ad0013b	119	return sys_pwrite64(fd, buf, count, merge_64(a4, a5));
1da177e4 LT	120	}
1da177e4 LT	121
65f8ebe0 RB	122	#ifdef CONFIG_SYSVIPC
65f8ebe0 RB	123
dbda6ac0 RB	124	SYSCALL_DEFINE6(32_ipc, u32, call, long, first, long, second, long, third,
dbda6ac0 RB	125	unsigned long, ptr, unsigned long, fifth)
1da177e4 LT	126	{
	127	int version, err;
	128
	129	version = call >> 16; /* hack for backward compatibility */
	130	call &= 0xffff;
	131
	132	switch (call) {
	133	case SEMOP:
	134	/* struct sembuf is the same on 32 and 64bit :)) */
05e43966	135	err = sys_semtimedop(first, compat_ptr(ptr), second, NULL);
1da177e4 LT	136	break;
1da177e4 LT	137	case SEMTIMEDOP:
05e43966 AN	138	err = compat_sys_semtimedop(first, compat_ptr(ptr), second,
05e43966 AN	139	compat_ptr(fifth));
1da177e4 LT	140	break;
1da177e4 LT	141	case SEMGET:
05e43966	142	err = sys_semget(first, second, third);
1da177e4 LT	143	break;
1da177e4 LT	144	case SEMCTL:
05e43966	145	err = compat_sys_semctl(first, second, third, compat_ptr(ptr));
1da177e4	146	break;
1da177e4	147	case MSGSND:
05e43966	148	err = compat_sys_msgsnd(first, second, third, compat_ptr(ptr));
1da177e4 LT	149	break;
1da177e4 LT	150	case MSGRCV:
05e43966 AN	151	err = compat_sys_msgrcv(first, second, fifth, third,
05e43966 AN	152	version, compat_ptr(ptr));
1da177e4 LT	153	break;
1da177e4 LT	154	case MSGGET:
05e43966	155	err = sys_msgget((key_t) first, second);
1da177e4 LT	156	break;
1da177e4 LT	157	case MSGCTL:
05e43966	158	err = compat_sys_msgctl(first, second, compat_ptr(ptr));
1da177e4	159	break;
1da177e4	160	case SHMAT:
05e43966 AN	161	err = compat_sys_shmat(first, second, third, version,
05e43966 AN	162	compat_ptr(ptr));
1da177e4 LT	163	break;
1da177e4 LT	164	case SHMDT:
05e43966	165	err = sys_shmdt(compat_ptr(ptr));
1da177e4 LT	166	break;
1da177e4 LT	167	case SHMGET:
05e43966	168	err = sys_shmget(first, (unsigned)second, third);
1da177e4 LT	169	break;
1da177e4 LT	170	case SHMCTL:
05e43966	171	err = compat_sys_shmctl(first, second, compat_ptr(ptr));
1da177e4 LT	172	break;
	173	default:
	174	err = -EINVAL;
	175	break;
	176	}
	177
	178	return err;
	179	}
	180
65f8ebe0 RB	181	#else
65f8ebe0 RB	182
dbda6ac0	183	SYSCALL_DEFINE6(32_ipc, u32, call, int, first, int, second, int, third,
c189846e	184	u32, ptr, u32, fifth)
65f8ebe0 RB	185	{
	186	return -ENOSYS;
	187	}
	188
	189	#endif /* CONFIG_SYSVIPC */
	190
05e43966	191	#ifdef CONFIG_MIPS32_N32
dbda6ac0	192	SYSCALL_DEFINE4(n32_semctl, int, semid, int, semnum, int, cmd, u32, arg)
1da177e4	193	{
05e43966 AN	194	/* compat_sys_semctl expects a pointer to union semun */
05e43966 AN	195	u32 __user *uptr = compat_alloc_user_space(sizeof(u32));
e16d8df0	196	if (put_user(arg, uptr))
05e43966 AN	197	return -EFAULT;
05e43966 AN	198	return compat_sys_semctl(semid, semnum, cmd, uptr);
1da177e4	199	}
e16d8df0	200
dbda6ac0 RB	201	SYSCALL_DEFINE4(n32_msgsnd, int, msqid, u32, msgp, unsigned int, msgsz,
dbda6ac0 RB	202	int, msgflg)
e16d8df0 AN	203	{
	204	return compat_sys_msgsnd(msqid, msgsz, msgflg, compat_ptr(msgp));
	205	}
	206
dbda6ac0 RB	207	SYSCALL_DEFINE5(n32_msgrcv, int, msqid, u32, msgp, size_t, msgsz,
dbda6ac0 RB	208	int, msgtyp, int, msgflg)
e16d8df0 AN	209	{
	210	return compat_sys_msgrcv(msqid, msgsz, msgtyp, msgflg, IPC_64,
	211	compat_ptr(msgp));
	212	}
05e43966	213	#endif
1da177e4	214
dbda6ac0	215	SYSCALL_DEFINE1(32_personality, unsigned long, personality)
1da177e4	216	{
d62c9ced	217	unsigned int p = personality & 0xffffffff;
1da177e4	218	int ret;
d62c9ced	219
53571ce4	220	if (personality(current->personality) == PER_LINUX32 &&
d62c9ced DD	221	personality(p) == PER_LINUX)
	222	p = (p & ~PER_MASK) \| PER_LINUX32;
	223	ret = sys_personality(p);
	224	if (ret != -1 && personality(ret) == PER_LINUX32)
	225	ret = (ret & ~PER_MASK) \| PER_LINUX;
1da177e4 LT	226	return ret;
	227	}
	228
1da177e4	229	asmlinkage ssize_t sys32_readahead(int fd, u32 pad0, u64 a2, u64 a3,
70342287	230	size_t count)
1da177e4 LT	231	{
	232	return sys_readahead(fd, merge_64(a2, a3), count);
	233	}
	234
a8d587a7 RB	235	asmlinkage long sys32_sync_file_range(int fd, int __pad,
	236	unsigned long a2, unsigned long a3,
	237	unsigned long a4, unsigned long a5,
	238	int flags)
	239	{
	240	return sys_sync_file_range(fd,
	241	merge_64(a2, a3), merge_64(a4, a5),
	242	flags);
	243	}
	244
8676d2e0 AN	245	asmlinkage long sys32_fadvise64_64(int fd, int __pad,
	246	unsigned long a2, unsigned long a3,
	247	unsigned long a4, unsigned long a5,
	248	int flags)
	249	{
	250	return sys_fadvise64_64(fd,
	251	merge_64(a2, a3), merge_64(a4, a5),
	252	flags);
	253	}
	254
4dc46775 RB	255	asmlinkage long sys32_fallocate(int fd, int mode, unsigned offset_a2,
	256	unsigned offset_a3, unsigned len_a4, unsigned len_a5)
	257	{
	258	return sys_fallocate(fd, mode, merge_64(offset_a2, offset_a3),
70342287	259	merge_64(len_a4, len_a5));
4dc46775 RB	260	}
4dc46775 RB	261
80b8585b WZ	262	asmlinkage long sys32_lookup_dcookie(u32 a0, u32 a1, char __user *buf,
	263	size_t len)
	264	{
	265	return sys_lookup_dcookie(merge_64(a0, a1), buf, len);
	266	}
5e844b31 DD	267
5e844b31 DD	268	SYSCALL_DEFINE6(32_fanotify_mark, int, fanotify_fd, unsigned int, flags,
70342287	269	u64, a3, u64, a4, int, dfd, const char __user *, pathname)
5e844b31 DD	270	{
	271	return sys_fanotify_mark(fanotify_fd, flags, merge_64(a3, a4),
	272	dfd, pathname);
	273	}