[linux-2.6-block.git] / arch / arm64 / kernel / sys32.S

/*
 * Compat system call wrappers
 *
 * Copyright (C) 2012 ARM Ltd.
 * Authors: Will Deacon <will.deacon@arm.com>
 *	    Catalin Marinas <catalin.marinas@arm.com>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

#include <linux/linkage.h>

#include <asm/assembler.h>
#include <asm/asm-offsets.h>

/*
 * System call wrappers for the AArch32 compatibility layer.
 */

compat_sys_sigreturn_wrapper:
	mov	x0, sp
	mov	x27, #0		// prevent syscall restart handling (why)
	b	compat_sys_sigreturn
ENDPROC(compat_sys_sigreturn_wrapper)

compat_sys_rt_sigreturn_wrapper:
	mov	x0, sp
	mov	x27, #0		// prevent syscall restart handling (why)
	b	compat_sys_rt_sigreturn
ENDPROC(compat_sys_rt_sigreturn_wrapper)

compat_sys_statfs64_wrapper:
	mov	w3, #84
	cmp	w1, #88
	csel	w1, w3, w1, eq
	b	compat_sys_statfs64
ENDPROC(compat_sys_statfs64_wrapper)

compat_sys_fstatfs64_wrapper:
	mov	w3, #84
	cmp	w1, #88
	csel	w1, w3, w1, eq
	b	compat_sys_fstatfs64
ENDPROC(compat_sys_fstatfs64_wrapper)

/*
 * Wrappers for AArch32 syscalls that either take 64-bit parameters
 * in registers or that take 32-bit parameters which require sign
 * extension.
 */
compat_sys_pread64_wrapper:
	regs_to_64	x3, x4, x5
	b	sys_pread64
ENDPROC(compat_sys_pread64_wrapper)

compat_sys_pwrite64_wrapper:
	regs_to_64	x3, x4, x5
	b	sys_pwrite64
ENDPROC(compat_sys_pwrite64_wrapper)

compat_sys_truncate64_wrapper:
	regs_to_64	x1, x2, x3
	b	sys_truncate
ENDPROC(compat_sys_truncate64_wrapper)

compat_sys_ftruncate64_wrapper:
	regs_to_64	x1, x2, x3
	b	sys_ftruncate
ENDPROC(compat_sys_ftruncate64_wrapper)

compat_sys_readahead_wrapper:
	regs_to_64	x1, x2, x3
	mov	w2, w4
	b	sys_readahead
ENDPROC(compat_sys_readahead_wrapper)

compat_sys_fadvise64_64_wrapper:
	mov	w6, w1
	regs_to_64	x1, x2, x3
	regs_to_64	x2, x4, x5
	mov	w3, w6
	b	sys_fadvise64_64
ENDPROC(compat_sys_fadvise64_64_wrapper)

compat_sys_sync_file_range2_wrapper:
	regs_to_64	x2, x2, x3
	regs_to_64	x3, x4, x5
	b	sys_sync_file_range2
ENDPROC(compat_sys_sync_file_range2_wrapper)

compat_sys_fallocate_wrapper:
	regs_to_64	x2, x2, x3
	regs_to_64	x3, x4, x5
	b	sys_fallocate
ENDPROC(compat_sys_fallocate_wrapper)

#undef __SYSCALL
#define __SYSCALL(x, y)		.quad	y	// x

/*
 * The system calls table must be 4KB aligned.
 */
	.align	12
ENTRY(compat_sys_call_table)
#include <asm/unistd32.h>
Commit	Line	Data
3dd681d9 WD	1	/*
	2	* Compat system call wrappers
	3	*
	4	* Copyright (C) 2012 ARM Ltd.
	5	* Authors: Will Deacon <will.deacon@arm.com>
	6	* Catalin Marinas <catalin.marinas@arm.com>
	7	*
	8	* This program is free software; you can redistribute it and/or modify
	9	* it under the terms of the GNU General Public License version 2 as
	10	* published by the Free Software Foundation.
	11	*
	12	* This program is distributed in the hope that it will be useful,
	13	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	14	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	15	* GNU General Public License for more details.
	16	*
	17	* You should have received a copy of the GNU General Public License
	18	* along with this program. If not, see <http://www.gnu.org/licenses/>.
	19	*/
	20
	21	#include <linux/linkage.h>
	22
	23	#include <asm/assembler.h>
	24	#include <asm/asm-offsets.h>
	25
	26	/*
	27	* System call wrappers for the AArch32 compatibility layer.
	28	*/
3dd681d9 WD	29
	30	compat_sys_sigreturn_wrapper:
	31	mov x0, sp
	32	mov x27, #0 // prevent syscall restart handling (why)
	33	b compat_sys_sigreturn
	34	ENDPROC(compat_sys_sigreturn_wrapper)
	35
	36	compat_sys_rt_sigreturn_wrapper:
	37	mov x0, sp
	38	mov x27, #0 // prevent syscall restart handling (why)
	39	b compat_sys_rt_sigreturn
	40	ENDPROC(compat_sys_rt_sigreturn_wrapper)
	41
3dd681d9 WD	42	compat_sys_statfs64_wrapper:
	43	mov w3, #84
	44	cmp w1, #88
	45	csel w1, w3, w1, eq
	46	b compat_sys_statfs64
	47	ENDPROC(compat_sys_statfs64_wrapper)
	48
	49	compat_sys_fstatfs64_wrapper:
	50	mov w3, #84
	51	cmp w1, #88
	52	csel w1, w3, w1, eq
	53	b compat_sys_fstatfs64
	54	ENDPROC(compat_sys_fstatfs64_wrapper)
	55
	56	/*
	57	* Wrappers for AArch32 syscalls that either take 64-bit parameters
	58	* in registers or that take 32-bit parameters which require sign
	59	* extension.
	60	*/
3dd681d9	61	compat_sys_pread64_wrapper:
55b89540	62	regs_to_64 x3, x4, x5
3dd681d9 WD	63	b sys_pread64
	64	ENDPROC(compat_sys_pread64_wrapper)
	65
	66	compat_sys_pwrite64_wrapper:
55b89540	67	regs_to_64 x3, x4, x5
3dd681d9 WD	68	b sys_pwrite64
	69	ENDPROC(compat_sys_pwrite64_wrapper)
	70
	71	compat_sys_truncate64_wrapper:
55b89540	72	regs_to_64 x1, x2, x3
3dd681d9 WD	73	b sys_truncate
	74	ENDPROC(compat_sys_truncate64_wrapper)
	75
	76	compat_sys_ftruncate64_wrapper:
55b89540	77	regs_to_64 x1, x2, x3
3dd681d9 WD	78	b sys_ftruncate
	79	ENDPROC(compat_sys_ftruncate64_wrapper)
	80
	81	compat_sys_readahead_wrapper:
55b89540	82	regs_to_64 x1, x2, x3
3dd681d9 WD	83	mov w2, w4
	84	b sys_readahead
	85	ENDPROC(compat_sys_readahead_wrapper)
	86
3dd681d9 WD	87	compat_sys_fadvise64_64_wrapper:
3dd681d9 WD	88	mov w6, w1
55b89540 ML	89	regs_to_64 x1, x2, x3
55b89540 ML	90	regs_to_64 x2, x4, x5
3dd681d9 WD	91	mov w3, w6
	92	b sys_fadvise64_64
	93	ENDPROC(compat_sys_fadvise64_64_wrapper)
	94
	95	compat_sys_sync_file_range2_wrapper:
55b89540 ML	96	regs_to_64 x2, x2, x3
55b89540 ML	97	regs_to_64 x3, x4, x5
3dd681d9 WD	98	b sys_sync_file_range2
	99	ENDPROC(compat_sys_sync_file_range2_wrapper)
	100
	101	compat_sys_fallocate_wrapper:
55b89540 ML	102	regs_to_64 x2, x2, x3
55b89540 ML	103	regs_to_64 x3, x4, x5
3dd681d9 WD	104	b sys_fallocate
	105	ENDPROC(compat_sys_fallocate_wrapper)
	106
3dd681d9 WD	107	#undef __SYSCALL
3dd681d9 WD	108	#define __SYSCALL(x, y) .quad y // x
3dd681d9 WD	109
	110	/*
	111	* The system calls table must be 4KB aligned.
	112	*/
	113	.align 12
	114	ENTRY(compat_sys_call_table)
f3d447a9	115	#include <asm/unistd32.h>