summaryrefslogtreecommitdiffstats
path: root/arch/ia64/include/asm/syscall.h
blob: 2f758a42f94bfaf086b9cc8361431c4ff9b683fe (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
/*
 * Access to user system call parameters and results
 *
 * Copyright (C) 2008 Intel Corp.  Shaohua Li <shaohua.li@intel.com>
 *
 * This copyrighted material is made available to anyone wishing to use,
 * modify, copy, or redistribute it subject to the terms and conditions
 * of the GNU General Public License v.2.
 *
 * See asm-generic/syscall.h for descriptions of what we must do here.
 */

#ifndef _ASM_SYSCALL_H
#define _ASM_SYSCALL_H	1

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

static inline long syscall_get_nr(struct task_struct *task,
				  struct pt_regs *regs)
{
	if ((long)regs->cr_ifs < 0) /* Not a syscall */
		return -1;

#ifdef CONFIG_IA32_SUPPORT
	if (IS_IA32_PROCESS(regs))
		return regs->r1;
#endif

	return regs->r15;
}

static inline void syscall_rollback(struct task_struct *task,
				    struct pt_regs *regs)
{
#ifdef CONFIG_IA32_SUPPORT
	if (IS_IA32_PROCESS(regs))
		regs->r8 = regs->r1;
#endif

	/* do nothing */
}

static inline long syscall_get_error(struct task_struct *task,
				     struct pt_regs *regs)
{
#ifdef CONFIG_IA32_SUPPORT
	if (IS_IA32_PROCESS(regs))
		return regs->r8;
#endif

	return regs->r10 == -1 ? regs->r8:0;
}

static inline long syscall_get_return_value(struct task_struct *task,
					    struct pt_regs *regs)
{
	return regs->r8;
}

static inline void syscall_set_return_value(struct task_struct *task,
					    struct pt_regs *regs,
					    int error, long val)
{
#ifdef CONFIG_IA32_SUPPORT
	if (IS_IA32_PROCESS(regs)) {
		regs->r8 = (long) error ? error : val;
		return;
	}
#endif

	if (error) {
		/* error < 0, but ia64 uses > 0 return value */
		regs->r8 = -error;
		regs->r10 = -1;
	} else {
		regs->r8 = val;
		regs->r10 = 0;
	}
}

extern void ia64_syscall_get_set_arguments(struct task_struct *task,
	struct pt_regs *regs, unsigned int i, unsigned int n,
	unsigned long *args, int rw);
static inline void syscall_get_arguments(struct task_struct *task,
					 struct pt_regs *regs,
					 unsigned int i, unsigned int n,
					 unsigned long *args)
{
	BUG_ON(i + n > 6);

#ifdef CONFIG_IA32_SUPPORT
	if (IS_IA32_PROCESS(regs)) {
		switch (i + n) {
		case 6:
			if (!n--) break;
			*args++ = regs->r13;
		case 5:
			if (!n--) break;
			*args++ = regs->r15;
		case 4:
			if (!n--) break;
			*args++ = regs->r14;
		case 3:
			if (!n--) break;
			*args++ = regs->r10;
		case 2:
			if (!n--) break;
			*args++ = regs->r9;
		case 1:
			if (!n--) break;
			*args++ = regs->r11;
		case 0:
			if (!n--) break;
		default:
			BUG();
			break;
		}

		return;
	}
#endif
	ia64_syscall_get_set_arguments(task, regs, i, n, args, 0);
}

static inline void syscall_set_arguments(struct task_struct *task,
					 struct pt_regs *regs,
					 unsigned int i, unsigned int n,
					 unsigned long *args)
{
	BUG_ON(i + n > 6);

#ifdef CONFIG_IA32_SUPPORT
	if (IS_IA32_PROCESS(regs)) {
		switch (i + n) {
		case 6:
			if (!n--) break;
			regs->r13 = *args++;
		case 5:
			if (!n--) break;
			regs->r15 = *args++;
		case 4:
			if (!n--) break;
			regs->r14 = *args++;
		case 3:
			if (!n--) break;
			regs->r10 = *args++;
		case 2:
			if (!n--) break;
			regs->r9 = *args++;
		case 1:
			if (!n--) break;
			regs->r11 = *args++;
		case 0:
			if (!n--) break;
		}

		return;
	}
#endif
	ia64_syscall_get_set_arguments(task, regs, i, n, args, 1);
}
#endif	/* _ASM_SYSCALL_H */
OpenPOWER on IntegriCloud