[GitHub/mt8127/android_kernel_alcatel_ttab.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>

extern const void *sys_call_table[];

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
6fa3eb70 S	19	#include <uapi/linux/audit.h>
6fa3eb70 S	20	#include <linux/compat.h>
f27bb139 MZ	21	#include <linux/err.h>
f27bb139 MZ	22
6fa3eb70	23	extern const void *sys_call_table[];
f27bb139 MZ	24
	25	static inline int syscall_get_nr(struct task_struct *task,
	26	struct pt_regs *regs)
	27	{
	28	return regs->syscallno;
	29	}
	30
	31	static inline void syscall_rollback(struct task_struct *task,
	32	struct pt_regs *regs)
	33	{
	34	regs->regs[0] = regs->orig_x0;
	35	}
	36
	37
	38	static inline long syscall_get_error(struct task_struct *task,
	39	struct pt_regs *regs)
	40	{
	41	unsigned long error = regs->regs[0];
	42	return IS_ERR_VALUE(error) ? error : 0;
	43	}
	44
	45	static inline long syscall_get_return_value(struct task_struct *task,
	46	struct pt_regs *regs)
	47	{
	48	return regs->regs[0];
	49	}
	50
	51	static inline void syscall_set_return_value(struct task_struct *task,
	52	struct pt_regs *regs,
	53	int error, long val)
	54	{
	55	regs->regs[0] = (long) error ? error : val;
	56	}
	57
	58	#define SYSCALL_MAX_ARGS 6
	59
	60	static inline void syscall_get_arguments(struct task_struct *task,
	61	struct pt_regs *regs,
	62	unsigned int i, unsigned int n,
	63	unsigned long *args)
	64	{
e2956ef5 AT	65	if (n == 0)
	66	return;
	67
f27bb139 MZ	68	if (i + n > SYSCALL_MAX_ARGS) {
	69	unsigned long *args_bad = args + SYSCALL_MAX_ARGS - i;
	70	unsigned int n_bad = n + i - SYSCALL_MAX_ARGS;
	71	pr_warning("%s called with max args %d, handling only %d\n",
	72	__func__, i + n, SYSCALL_MAX_ARGS);
	73	memset(args_bad, 0, n_bad * sizeof(args[0]));
	74	}
	75
	76	if (i == 0) {
	77	args[0] = regs->orig_x0;
	78	args++;
	79	i++;
	80	n--;
	81	}
	82
	83	memcpy(args, &regs->regs[i], n * sizeof(args[0]));
	84	}
	85
	86	static inline void syscall_set_arguments(struct task_struct *task,
	87	struct pt_regs *regs,
	88	unsigned int i, unsigned int n,
	89	const unsigned long *args)
	90	{
e2956ef5 AT	91	if (n == 0)
	92	return;
	93
f27bb139 MZ	94	if (i + n > SYSCALL_MAX_ARGS) {
	95	pr_warning("%s called with max args %d, handling only %d\n",
	96	__func__, i + n, SYSCALL_MAX_ARGS);
	97	n = SYSCALL_MAX_ARGS - i;
	98	}
	99
	100	if (i == 0) {
	101	regs->orig_x0 = args[0];
	102	args++;
	103	i++;
	104	n--;
	105	}
	106
	107	memcpy(&regs->regs[i], args, n * sizeof(args[0]));
	108	}
	109
6fa3eb70 S	110	/*
	111	* We don't care about endianness (__AUDIT_ARCH_LE bit) here because
	112	* AArch64 has the same system calls both on little- and big- endian.
	113	*/
	114	static inline int syscall_get_arch(void)
	115	{
	116	if (is_compat_task())
	117	return AUDIT_ARCH_ARM;
	118
	119	return AUDIT_ARCH_AARCH64;
	120	}
	121
f27bb139	122	#endif /* __ASM_SYSCALL_H */