[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>

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>
	11
	12	extern const unsigned long sys_call_table[];
	13
	14	static inline int syscall_get_nr(struct task_struct *task,
	15	struct pt_regs *regs)
	16	{
	17	return task_thread_info(task)->syscall;
	18	}
	19
	20	static inline void syscall_rollback(struct task_struct *task,
	21	struct pt_regs *regs)
	22	{
	23	regs->ARM_r0 = regs->ARM_ORIG_r0;
	24	}
	25
	26	static inline long syscall_get_error(struct task_struct *task,
	27	struct pt_regs *regs)
	28	{
	29	unsigned long error = regs->ARM_r0;
	30	return IS_ERR_VALUE(error) ? error : 0;
	31	}
	32
	33	static inline long syscall_get_return_value(struct task_struct *task,
	34	struct pt_regs *regs)
	35	{
	36	return regs->ARM_r0;
	37	}
	38
	39	static inline void syscall_set_return_value(struct task_struct *task,
	40	struct pt_regs *regs,
	41	int error, long val)
	42	{
	43	regs->ARM_r0 = (long) error ? error : val;
	44	}
	45
	46	#define SYSCALL_MAX_ARGS 7
	47
	48	static inline void syscall_get_arguments(struct task_struct *task,
	49	struct pt_regs *regs,
	50	unsigned int i, unsigned int n,
	51	unsigned long *args)
	52	{
	53	if (i + n > SYSCALL_MAX_ARGS) {
	54	unsigned long *args_bad = args + SYSCALL_MAX_ARGS - i;
	55	unsigned int n_bad = n + i - SYSCALL_MAX_ARGS;
	56	pr_warning("%s called with max args %d, handling only %d\n",
	57	__func__, i + n, SYSCALL_MAX_ARGS);
	58	memset(args_bad, 0, n_bad * sizeof(args[0]));
	59	n = SYSCALL_MAX_ARGS - i;
	60	}
	61
	62	if (i == 0) {
	63	args[0] = regs->ARM_ORIG_r0;
	64	args++;
65	i++;
66	n--;
67	}
68
69	memcpy(args, &regs->ARM_r0 + i, n * sizeof(args[0]));
70	}
71
72	static inline void syscall_set_arguments(struct task_struct *task,
73	struct pt_regs *regs,
74	unsigned int i, unsigned int n,
75	const unsigned long *args)
76	{
77	if (i + n > SYSCALL_MAX_ARGS) {
78	pr_warning("%s called with max args %d, handling only %d\n",
79	__func__, i + n, SYSCALL_MAX_ARGS);
80	n = SYSCALL_MAX_ARGS - i;
81	}
82
83	if (i == 0) {
84	regs->ARM_ORIG_r0 = args[0];
85	args++;
86	i++;
87	n--;
88	}
89
90	memcpy(&regs->ARM_r0 + i, args, n * sizeof(args[0]));
91	}
92
93	#endif /* _ASM_ARM_SYSCALL_H */