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/arch/s390/include/asm/syscall.h

https://bitbucket.org/thekraven/iscream_thunderc-2.6.35
C++ Header | 92 lines | 65 code | 12 blank | 15 comment | 13 complexity | 29ff133dd0c8b6d2151fad1b8010a82b MD5 | raw file
Possible License(s): GPL-2.0, LGPL-2.0, AGPL-1.0
 1/*
 2 * Access to user system call parameters and results
 3 *
 4 *  Copyright IBM Corp. 2008
 5 *  Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com)
 6 *
 7 * This program is free software; you can redistribute it and/or modify
 8 * it under the terms of the GNU General Public License (version 2 only)
 9 * as published by the Free Software Foundation.
10 */
11
12#ifndef _ASM_SYSCALL_H
13#define _ASM_SYSCALL_H	1
14
15#include <linux/sched.h>
16#include <asm/ptrace.h>
17
18/*
19 * The syscall table always contains 32 bit pointers since we know that the
20 * address of the function to be called is (way) below 4GB.  So the "int"
21 * type here is what we want [need] for both 32 bit and 64 bit systems.
22 */
23extern const unsigned int sys_call_table[];
24
25static inline long syscall_get_nr(struct task_struct *task,
26				  struct pt_regs *regs)
27{
28	return regs->svcnr ? regs->svcnr : -1;
29}
30
31static inline void syscall_rollback(struct task_struct *task,
32				    struct pt_regs *regs)
33{
34	regs->gprs[2] = regs->orig_gpr2;
35}
36
37static inline long syscall_get_error(struct task_struct *task,
38				     struct pt_regs *regs)
39{
40	return (regs->gprs[2] >= -4096UL) ? -regs->gprs[2] : 0;
41}
42
43static inline long syscall_get_return_value(struct task_struct *task,
44					    struct pt_regs *regs)
45{
46	return regs->gprs[2];
47}
48
49static inline void syscall_set_return_value(struct task_struct *task,
50					    struct pt_regs *regs,
51					    int error, long val)
52{
53	regs->gprs[2] = error ? -error : val;
54}
55
56static inline void syscall_get_arguments(struct task_struct *task,
57					 struct pt_regs *regs,
58					 unsigned int i, unsigned int n,
59					 unsigned long *args)
60{
61	unsigned long mask = -1UL;
62
63	BUG_ON(i + n > 6);
64#ifdef CONFIG_COMPAT
65	if (test_tsk_thread_flag(task, TIF_31BIT))
66		mask = 0xffffffff;
67#endif
68	if (i + n == 6)
69		args[--n] = regs->args[0] & mask;
70	while (n-- > 0)
71		if (i + n > 0)
72			args[n] = regs->gprs[2 + i + n] & mask;
73	if (i == 0)
74		args[0] = regs->orig_gpr2 & mask;
75}
76
77static inline void syscall_set_arguments(struct task_struct *task,
78					 struct pt_regs *regs,
79					 unsigned int i, unsigned int n,
80					 const unsigned long *args)
81{
82	BUG_ON(i + n > 6);
83	if (i + n == 6)
84		regs->args[0] = args[--n];
85	while (n-- > 0)
86		if (i + n > 0)
87			regs->gprs[2 + i + n] = args[n];
88	if (i == 0)
89		regs->orig_gpr2 = args[0];
90}
91
92#endif	/* _ASM_SYSCALL_H */