[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/audit.h> /* for AUDIT_ARCH_* */
#include <linux/elf.h> /* for ELF_EM */
#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 (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]));
		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 (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->ARM_ORIG_r0 = args[0];
		args++;
		i++;
		n--;
	}

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

static inline int syscall_get_arch(void)
{
	/* ARM tasks don't change audit architectures on the fly. */
	return AUDIT_ARCH_ARM;
}

#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
1f59d13b WD	10	#include <linux/audit.h> /* for AUDIT_ARCH_* */
1f59d13b WD	11	#include <linux/elf.h> /* for ELF_EM */
bf2c9f98	12	#include <linux/err.h>
8ef102c6	13	#include <linux/sched.h>
bf2c9f98	14
1f66e06f WF	15	#include <asm/unistd.h>
	16
	17	#define NR_syscalls (__NR_syscalls)
	18
bf2c9f98 WF	19	extern const unsigned long sys_call_table[];
	20
	21	static inline int syscall_get_nr(struct task_struct *task,
	22	struct pt_regs *regs)
	23	{
	24	return task_thread_info(task)->syscall;
	25	}
	26
	27	static inline void syscall_rollback(struct task_struct *task,
	28	struct pt_regs *regs)
	29	{
	30	regs->ARM_r0 = regs->ARM_ORIG_r0;
	31	}
	32
	33	static inline long syscall_get_error(struct task_struct *task,
	34	struct pt_regs *regs)
	35	{
	36	unsigned long error = regs->ARM_r0;
	37	return IS_ERR_VALUE(error) ? error : 0;
	38	}
	39
	40	static inline long syscall_get_return_value(struct task_struct *task,
	41	struct pt_regs *regs)
	42	{
	43	return regs->ARM_r0;
	44	}
	45
	46	static inline void syscall_set_return_value(struct task_struct *task,
	47	struct pt_regs *regs,
	48	int error, long val)
	49	{
	50	regs->ARM_r0 = (long) error ? error : val;
	51	}
	52
	53	#define SYSCALL_MAX_ARGS 7
	54
	55	static inline void syscall_get_arguments(struct task_struct *task,
	56	struct pt_regs *regs,
	57	unsigned int i, unsigned int n,
	58	unsigned long *args)
	59	{
4a402463 AT	60	if (n == 0)
	61	return;
	62
bf2c9f98 WF	63	if (i + n > SYSCALL_MAX_ARGS) {
	64	unsigned long *args_bad = args + SYSCALL_MAX_ARGS - i;
	65	unsigned int n_bad = n + i - SYSCALL_MAX_ARGS;
	66	pr_warning("%s called with max args %d, handling only %d\n",
	67	__func__, i + n, SYSCALL_MAX_ARGS);
	68	memset(args_bad, 0, n_bad * sizeof(args[0]));
	69	n = SYSCALL_MAX_ARGS - i;
	70	}
	71
	72	if (i == 0) {
	73	args[0] = regs->ARM_ORIG_r0;
	74	args++;
	75	i++;
	76	n--;
	77	}
	78
	79	memcpy(args, &regs->ARM_r0 + i, n * sizeof(args[0]));
	80	}
	81
	82	static inline void syscall_set_arguments(struct task_struct *task,
	83	struct pt_regs *regs,
	84	unsigned int i, unsigned int n,
	85	const unsigned long *args)
	86	{
4a402463 AT	87	if (n == 0)
	88	return;
	89
bf2c9f98 WF	90	if (i + n > SYSCALL_MAX_ARGS) {
	91	pr_warning("%s called with max args %d, handling only %d\n",
	92	__func__, i + n, SYSCALL_MAX_ARGS);
	93	n = SYSCALL_MAX_ARGS - i;
	94	}
	95
	96	if (i == 0) {
	97	regs->ARM_ORIG_r0 = args[0];
	98	args++;
	99	i++;
	100	n--;
	101	}
	102
	103	memcpy(&regs->ARM_r0 + i, args, n * sizeof(args[0]));
	104	}
	105
6fa3eb70	106	static inline int syscall_get_arch(void)
1f59d13b WD	107	{
	108	/* ARM tasks don't change audit architectures on the fly. */
	109	return AUDIT_ARCH_ARM;
	110	}
	111
bf2c9f98	112	#endif /* _ASM_ARM_SYSCALL_H */