aboutsummaryrefslogtreecommitdiff
path: root/arch/s390/include/asm/syscall.h
blob: 2429b87eb28d92c6fc6adf5a5887f2b29e062d70 (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
/*
 * Access to user system call parameters and results
 *
 *  Copyright IBM Corp. 2008
 *  Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com)
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License (version 2 only)
 * as published by the Free Software Foundation.
 */

#ifndef _ASM_SYSCALL_H
#define _ASM_SYSCALL_H	1

#include <asm/ptrace.h>

static inline long syscall_get_nr(struct task_struct *task,
				  struct pt_regs *regs)
{
	return regs->svcnr ? regs->svcnr : -1;
}

static inline void syscall_rollback(struct task_struct *task,
				    struct pt_regs *regs)
{
	regs->gprs[2] = regs->orig_gpr2;
}

static inline long syscall_get_error(struct task_struct *task,
				     struct pt_regs *regs)
{
	return (regs->gprs[2] >= -4096UL) ? -regs->gprs[2] : 0;
}

static inline long syscall_get_return_value(struct task_struct *task,
					    struct pt_regs *regs)
{
	return regs->gprs[2];
}

static inline void syscall_set_return_value(struct task_struct *task,
					    struct pt_regs *regs,
					    int error, long val)
{
	regs->gprs[2] = error ? -error : val;
}

static inline void syscall_get_arguments(struct task_struct *task,
					 struct pt_regs *regs,
					 unsigned int i, unsigned int n,
					 unsigned long *args)
{
	unsigned long mask = -1UL;

	BUG_ON(i + n > 6);
#ifdef CONFIG_COMPAT
	if (test_tsk_thread_flag(task, TIF_31BIT))
		mask = 0xffffffff;
#endif
	if (i + n == 6)
		args[--n] = regs->args[0] & mask;
	while (n-- > 0)
		if (i + n > 0)
			args[n] = regs->gprs[2 + i + n] & mask;
	if (i == 0)
		args[0] = regs->orig_gpr2 & mask;
}

static inline void syscall_set_arguments(struct task_struct *task,
					 struct pt_regs *regs,
					 unsigned int i, unsigned int n,
					 const unsigned long *args)
{
	BUG_ON(i + n > 6);
	if (i + n == 6)
		regs->args[0] = args[--n];
	while (n-- > 0)
		if (i + n > 0)
			regs->gprs[2 + i + n] = args[n];
	if (i == 0)
		regs->orig_gpr2 = args[0];
}

#endif	/* _ASM_SYSCALL_H */