Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
linux
1/* SPDX-License-Identifier: GPL-2.0-only */
2/*
3 * Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com)
4 */
5
6#ifndef _ASM_ARC_SYSCALL_H
7#define _ASM_ARC_SYSCALL_H 1
8
9#include <uapi/linux/audit.h>
10#include <linux/err.h>
11#include <linux/sched.h>
12#include <asm/unistd.h>
13#include <asm/ptrace.h> /* in_syscall() */
14
15extern void *sys_call_table[];
16
17static inline long
18syscall_get_nr(struct task_struct *task, struct pt_regs *regs)
19{
20 if (user_mode(regs) && in_syscall(regs))
21 return regs->r8;
22 else
23 return -1;
24}
25
26static inline void
27syscall_set_nr(struct task_struct *task, struct pt_regs *regs, int nr)
28{
29 /*
30 * Unlike syscall_get_nr(), syscall_set_nr() can be called only when
31 * the target task is stopped for tracing on entering syscall, so
32 * there is no need to have the same check syscall_get_nr() has.
33 */
34 regs->r8 = nr;
35}
36
37static inline void
38syscall_rollback(struct task_struct *task, struct pt_regs *regs)
39{
40 regs->r0 = regs->orig_r0;
41}
42
43static inline long
44syscall_get_error(struct task_struct *task, struct pt_regs *regs)
45{
46 /* 0 if syscall succeeded, otherwise -Errorcode */
47 return IS_ERR_VALUE(regs->r0) ? regs->r0 : 0;
48}
49
50static inline long
51syscall_get_return_value(struct task_struct *task, struct pt_regs *regs)
52{
53 return regs->r0;
54}
55
56static inline void
57syscall_set_return_value(struct task_struct *task, struct pt_regs *regs,
58 int error, long val)
59{
60 regs->r0 = (long) error ?: val;
61}
62
63/*
64 * @i: argument index [0,5]
65 * @n: number of arguments; n+i must be [1,6].
66 */
67static inline void
68syscall_get_arguments(struct task_struct *task, struct pt_regs *regs,
69 unsigned long *args)
70{
71 unsigned long *inside_ptregs = &(regs->r0);
72 unsigned int n = 6;
73 unsigned int i = 0;
74
75 while (n--) {
76 args[i++] = (*inside_ptregs);
77 inside_ptregs--;
78 }
79}
80
81static inline void
82syscall_set_arguments(struct task_struct *task, struct pt_regs *regs,
83 unsigned long *args)
84{
85 unsigned long *inside_ptregs = ®s->r0;
86 unsigned int n = 6;
87 unsigned int i = 0;
88
89 while (n--) {
90 *inside_ptregs = args[i++];
91 inside_ptregs--;
92 }
93}
94
95static inline int
96syscall_get_arch(struct task_struct *task)
97{
98 return IS_ENABLED(CONFIG_ISA_ARCOMPACT)
99 ? (IS_ENABLED(CONFIG_CPU_BIG_ENDIAN)
100 ? AUDIT_ARCH_ARCOMPACTBE : AUDIT_ARCH_ARCOMPACT)
101 : (IS_ENABLED(CONFIG_CPU_BIG_ENDIAN)
102 ? AUDIT_ARCH_ARCV2BE : AUDIT_ARCH_ARCV2);
103}
104
105#endif