[thirdparty/kernel/stable.git] / arch / arm64 / include / asm / syscall.h

/*
 * Copyright (C) 2012 ARM Ltd.
 *
 * 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/>.
 */
#ifndef __ASM_SYSCALL_H
#define __ASM_SYSCALL_H

#include <uapi/linux/audit.h>
#include <linux/compat.h>
#include <linux/err.h>

typedef long (*syscall_fn_t)(struct pt_regs *regs);

extern const syscall_fn_t sys_call_table[];

#ifdef CONFIG_COMPAT
extern const syscall_fn_t compat_sys_call_table[];
#endif

static inline int syscall_get_nr(struct task_struct *task,
				 struct pt_regs *regs)
{
	return regs->syscallno;
}

static inline void syscall_rollback(struct task_struct *task,
				    struct pt_regs *regs)
{
	regs->regs[0] = regs->orig_x0;
}


static inline long syscall_get_error(struct task_struct *task,
				     struct pt_regs *regs)
{
	unsigned long error = regs->regs[0];
	return IS_ERR_VALUE(error) ? error : 0;
}

static inline long syscall_get_return_value(struct task_struct *task,
					    struct pt_regs *regs)
{
	return regs->regs[0];
}

static inline void syscall_set_return_value(struct task_struct *task,
					    struct pt_regs *regs,
					    int error, long val)
{
	regs->regs[0] = (long) error ? error : val;
}

#define SYSCALL_MAX_ARGS 6

static inline void syscall_get_arguments(struct task_struct *task,
					 struct pt_regs *regs,
					 unsigned int i, unsigned int n,
					 unsigned long *args)
{
	if (n == 0)
		return;

	if (i + n > SYSCALL_MAX_ARGS) {
		unsigned long *args_bad = args + SYSCALL_MAX_ARGS - i;
		unsigned int n_bad = n + i - SYSCALL_MAX_ARGS;
		pr_warning("%s called with max args %d, handling only %d\n",
			   __func__, i + n, SYSCALL_MAX_ARGS);
		memset(args_bad, 0, n_bad * sizeof(args[0]));
	}

	if (i == 0) {
		args[0] = regs->orig_x0;
		args++;
		i++;
		n--;
	}

	memcpy(args, &regs->regs[i], n * sizeof(args[0]));
}

static inline void syscall_set_arguments(struct task_struct *task,
					 struct pt_regs *regs,
					 unsigned int i, unsigned int n,
					 const unsigned long *args)
{
	if (n == 0)
		return;

	if (i + n > SYSCALL_MAX_ARGS) {
		pr_warning("%s called with max args %d, handling only %d\n",
			   __func__, i + n, SYSCALL_MAX_ARGS);
		n = SYSCALL_MAX_ARGS - i;
	}

	if (i == 0) {
		regs->orig_x0 = args[0];
		args++;
		i++;
		n--;
	}

	memcpy(&regs->regs[i], args, n * sizeof(args[0]));
}

/*
 * We don't care about endianness (__AUDIT_ARCH_LE bit) here because
 * AArch64 has the same system calls both on little- and big- endian.
 */
static inline int syscall_get_arch(void)
{
	if (is_compat_task())
		return AUDIT_ARCH_ARM;

	return AUDIT_ARCH_AARCH64;
}

#endif	/* __ASM_SYSCALL_H */
Commit	Line	Data
f27bb139 MZ	1	/*
	2	* Copyright (C) 2012 ARM Ltd.
	3	*
	4	* This program is free software; you can redistribute it and/or modify
	5	* it under the terms of the GNU General Public License version 2 as
	6	* published by the Free Software Foundation.
	7	*
	8	* This program is distributed in the hope that it will be useful,
	9	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	10	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	11	* GNU General Public License for more details.
	12	*
	13	* You should have received a copy of the GNU General Public License
	14	* along with this program. If not, see <http://www.gnu.org/licenses/>.
	15	*/
	16	#ifndef __ASM_SYSCALL_H
	17	#define __ASM_SYSCALL_H
	18
875cbf3e AT	19	#include <uapi/linux/audit.h>
875cbf3e AT	20	#include <linux/compat.h>
f27bb139 MZ	21	#include <linux/err.h>
f27bb139 MZ	22
4378a7d4	23	typedef long (syscall_fn_t)(struct pt_regs regs);
27d83e68 MR	24
27d83e68 MR	25	extern const syscall_fn_t sys_call_table[];
f27bb139	26
3b714275 MR	27	#ifdef CONFIG_COMPAT
	28	extern const syscall_fn_t compat_sys_call_table[];
	29	#endif
	30
f27bb139 MZ	31	static inline int syscall_get_nr(struct task_struct *task,
	32	struct pt_regs *regs)
	33	{
	34	return regs->syscallno;
	35	}
	36
	37	static inline void syscall_rollback(struct task_struct *task,
	38	struct pt_regs *regs)
	39	{
	40	regs->regs[0] = regs->orig_x0;
	41	}
	42
	43
	44	static inline long syscall_get_error(struct task_struct *task,
	45	struct pt_regs *regs)
	46	{
	47	unsigned long error = regs->regs[0];
	48	return IS_ERR_VALUE(error) ? error : 0;
	49	}
	50
	51	static inline long syscall_get_return_value(struct task_struct *task,
	52	struct pt_regs *regs)
	53	{
	54	return regs->regs[0];
	55	}
	56
	57	static inline void syscall_set_return_value(struct task_struct *task,
	58	struct pt_regs *regs,
	59	int error, long val)
	60	{
	61	regs->regs[0] = (long) error ? error : val;
	62	}
	63
	64	#define SYSCALL_MAX_ARGS 6
	65
	66	static inline void syscall_get_arguments(struct task_struct *task,
	67	struct pt_regs *regs,
	68	unsigned int i, unsigned int n,
	69	unsigned long *args)
	70	{
7b22c035 AT	71	if (n == 0)
	72	return;
	73
f27bb139 MZ	74	if (i + n > SYSCALL_MAX_ARGS) {
	75	unsigned long *args_bad = args + SYSCALL_MAX_ARGS - i;
	76	unsigned int n_bad = n + i - SYSCALL_MAX_ARGS;
	77	pr_warning("%s called with max args %d, handling only %d\n",
	78	__func__, i + n, SYSCALL_MAX_ARGS);
	79	memset(args_bad, 0, n_bad * sizeof(args[0]));
	80	}
	81
	82	if (i == 0) {
	83	args[0] = regs->orig_x0;
	84	args++;
	85	i++;
	86	n--;
	87	}
	88
	89	memcpy(args, &regs->regs[i], n * sizeof(args[0]));
	90	}
	91
	92	static inline void syscall_set_arguments(struct task_struct *task,
	93	struct pt_regs *regs,
	94	unsigned int i, unsigned int n,
	95	const unsigned long *args)
	96	{
7b22c035 AT	97	if (n == 0)
	98	return;
	99
f27bb139 MZ	100	if (i + n > SYSCALL_MAX_ARGS) {
	101	pr_warning("%s called with max args %d, handling only %d\n",
	102	__func__, i + n, SYSCALL_MAX_ARGS);
	103	n = SYSCALL_MAX_ARGS - i;
	104	}
	105
	106	if (i == 0) {
	107	regs->orig_x0 = args[0];
	108	args++;
	109	i++;
	110	n--;
	111	}
	112
	113	memcpy(&regs->regs[i], args, n * sizeof(args[0]));
	114	}
	115
875cbf3e AT	116	/*
	117	* We don't care about endianness (__AUDIT_ARCH_LE bit) here because
	118	* AArch64 has the same system calls both on little- and big- endian.
	119	*/
	120	static inline int syscall_get_arch(void)
	121	{
	122	if (is_compat_task())
	123	return AUDIT_ARCH_ARM;
	124
	125	return AUDIT_ARCH_AARCH64;
	126	}
	127
f27bb139	128	#endif /* __ASM_SYSCALL_H */