1/*
2 * Access to user system call parameters and results
3 *
4 * Copyright (C) 2008 Intel Corp.  Shaohua Li <shaohua.li@intel.com>
5 *
6 * This copyrighted material is made available to anyone wishing to use,
7 * modify, copy, or redistribute it subject to the terms and conditions
8 * of the GNU General Public License v.2.
9 *
10 * See asm-generic/syscall.h for descriptions of what we must do here.
11 */
12
13#ifndef _ASM_SYSCALL_H
14#define _ASM_SYSCALL_H	1
15
16#include <uapi/linux/audit.h>
17#include <linux/sched.h>
18#include <linux/err.h>
19
20static inline long syscall_get_nr(struct task_struct *task,
21				  struct pt_regs *regs)
22{
23	if ((long)regs->cr_ifs < 0) /* Not a syscall */
24		return -1;
25
26	return regs->r15;
27}
28
29static inline void syscall_rollback(struct task_struct *task,
30				    struct pt_regs *regs)
31{
32	/* do nothing */
33}
34
35static inline long syscall_get_error(struct task_struct *task,
36				     struct pt_regs *regs)
37{
38	return regs->r10 == -1 ? regs->r8:0;
39}
40
41static inline long syscall_get_return_value(struct task_struct *task,
42					    struct pt_regs *regs)
43{
44	return regs->r8;
45}
46
47static inline void syscall_set_return_value(struct task_struct *task,
48					    struct pt_regs *regs,
49					    int error, long val)
50{
51	if (error) {
52		/* error < 0, but ia64 uses > 0 return value */
53		regs->r8 = -error;
54		regs->r10 = -1;
55	} else {
56		regs->r8 = val;
57		regs->r10 = 0;
58	}
59}
60
61extern void ia64_syscall_get_set_arguments(struct task_struct *task,
62	struct pt_regs *regs, unsigned int i, unsigned int n,
63	unsigned long *args, int rw);
64static inline void syscall_get_arguments(struct task_struct *task,
65					 struct pt_regs *regs,
66					 unsigned int i, unsigned int n,
67					 unsigned long *args)
68{
69	BUG_ON(i + n > 6);
70
71	ia64_syscall_get_set_arguments(task, regs, i, n, args, 0);
72}
73
74static inline void syscall_set_arguments(struct task_struct *task,
75					 struct pt_regs *regs,
76					 unsigned int i, unsigned int n,
77					 unsigned long *args)
78{
79	BUG_ON(i + n > 6);
80
81	ia64_syscall_get_set_arguments(task, regs, i, n, args, 1);
82}
83
84static inline int syscall_get_arch(void)
85{
86	return AUDIT_ARCH_IA64;
87}
88#endif	/* _ASM_SYSCALL_H */
89