[GitHub/mt8127/android_kernel_alcatel_ttab.git] / arch / arm / include / asm / syscall.h

/*
 * Access to user system call parameters and results
 *
 * See asm-generic/syscall.h for descriptions of what we must do here.
 */

#ifndef _ASM_ARM_SYSCALL_H
#define _ASM_ARM_SYSCALL_H

#include <linux/err.h>
#include <linux/sched.h>

#include <asm/unistd.h>

#define NR_syscalls (__NR_syscalls)

extern const unsigned long sys_call_table[];

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

static inline void syscall_rollback(struct task_struct *task,
				    struct pt_regs *regs)
{
	regs->ARM_r0 = regs->ARM_ORIG_r0;
}

static inline long syscall_get_error(struct task_struct *task,
				     struct pt_regs *regs)
{
	unsigned long error = regs->ARM_r0;
	return IS_ERR_VALUE(error) ? error : 0;
}

static inline long syscall_get_return_value(struct task_struct *task,
					    struct pt_regs *regs)
{
	return regs->ARM_r0;
}

static inline void syscall_set_return_value(struct task_struct *task,
					    struct pt_regs *regs,
					    int error, long val)
{
	regs->ARM_r0 = (long) error ? error : val;
}

#define SYSCALL_MAX_ARGS 7

static inline void syscall_get_arguments(struct task_struct *task,
					 struct pt_regs *regs,
					 unsigned int i, unsigned int n,
					 unsigned long *args)
{
	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]));
		n = SYSCALL_MAX_ARGS - i;
	}

	if (i == 0) {
		args[0] = regs->ARM_ORIG_r0;
		args++;
		i++;
		n--;
	}

	memcpy(args, &regs->ARM_r0 + 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 (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->ARM_ORIG_r0 = args[0];
		args++;
		i++;
		n--;
	}

	memcpy(&regs->ARM_r0 + i, args, n * sizeof(args[0]));
}

#endif /* _ASM_ARM_SYSCALL_H */
Commit	Line	Data
bf2c9f98 WF	1	/*
	2	* Access to user system call parameters and results
	3	*
	4	* See asm-generic/syscall.h for descriptions of what we must do here.
	5	*/
	6
	7	#ifndef _ASM_ARM_SYSCALL_H
	8	#define _ASM_ARM_SYSCALL_H
	9
	10	#include <linux/err.h>
8ef102c6	11	#include <linux/sched.h>
bf2c9f98	12
1f66e06f WF	13	#include <asm/unistd.h>
	14
	15	#define NR_syscalls (__NR_syscalls)
	16
bf2c9f98 WF	17	extern const unsigned long sys_call_table[];
	18
	19	static inline int syscall_get_nr(struct task_struct *task,
	20	struct pt_regs *regs)
	21	{
	22	return task_thread_info(task)->syscall;
	23	}
	24
	25	static inline void syscall_rollback(struct task_struct *task,
	26	struct pt_regs *regs)
	27	{
	28	regs->ARM_r0 = regs->ARM_ORIG_r0;
	29	}
	30
	31	static inline long syscall_get_error(struct task_struct *task,
	32	struct pt_regs *regs)
	33	{
	34	unsigned long error = regs->ARM_r0;
	35	return IS_ERR_VALUE(error) ? error : 0;
	36	}
	37
	38	static inline long syscall_get_return_value(struct task_struct *task,
	39	struct pt_regs *regs)
	40	{
	41	return regs->ARM_r0;
	42	}
	43
	44	static inline void syscall_set_return_value(struct task_struct *task,
	45	struct pt_regs *regs,
	46	int error, long val)
	47	{
	48	regs->ARM_r0 = (long) error ? error : val;
	49	}
	50
	51	#define SYSCALL_MAX_ARGS 7
	52
	53	static inline void syscall_get_arguments(struct task_struct *task,
	54	struct pt_regs *regs,
	55	unsigned int i, unsigned int n,
	56	unsigned long *args)
	57	{
	58	if (i + n > SYSCALL_MAX_ARGS) {
	59	unsigned long *args_bad = args + SYSCALL_MAX_ARGS - i;
	60	unsigned int n_bad = n + i - SYSCALL_MAX_ARGS;
	61	pr_warning("%s called with max args %d, handling only %d\n",
	62	__func__, i + n, SYSCALL_MAX_ARGS);
	63	memset(args_bad, 0, n_bad * sizeof(args[0]));
	64	n = SYSCALL_MAX_ARGS - i;
	65	}
	66
	67	if (i == 0) {
	68	args[0] = regs->ARM_ORIG_r0;
	69	args++;
	70	i++;
	71	n--;
	72	}
	73
	74	memcpy(args, &regs->ARM_r0 + i, n * sizeof(args[0]));
	75	}
	76
	77	static inline void syscall_set_arguments(struct task_struct *task,
	78	struct pt_regs *regs,
	79	unsigned int i, unsigned int n,
	80	const unsigned long *args)
81	{
82	if (i + n > SYSCALL_MAX_ARGS) {
83	pr_warning("%s called with max args %d, handling only %d\n",
84	__func__, i + n, SYSCALL_MAX_ARGS);
85	n = SYSCALL_MAX_ARGS - i;
86	}
87
88	if (i == 0) {
89	regs->ARM_ORIG_r0 = args[0];
90	args++;
91	i++;
92	n--;
93	}
94
95	memcpy(&regs->ARM_r0 + i, args, n * sizeof(args[0]));
96	}
97
98	#endif /* _ASM_ARM_SYSCALL_H */