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
15 extern void *sys_call_table[];
16
17 static inline long
18 syscall_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
26 static inline void
27 syscall_rollback(struct task_struct *task, struct pt_regs *regs)
28 {
29 regs->r0 = regs->orig_r0;
30 }
31
32 static inline long
33 syscall_get_error(struct task_struct *task, struct pt_regs *regs)
34 {
35 /* 0 if syscall succeeded, otherwise -Errorcode */
36 return IS_ERR_VALUE(regs->r0) ? regs->r0 : 0;
37 }
38
39 static inline long
40 syscall_get_return_value(struct task_struct *task, struct pt_regs *regs)
41 {
42 return regs->r0;
43 }
44
45 static inline void
46 syscall_set_return_value(struct task_struct *task, struct pt_regs *regs,
47 int error, long val)
48 {
49 regs->r0 = (long) error ?: val;
50 }
51
52 /*
53 * @i: argument index [0,5]
54 * @n: number of arguments; n+i must be [1,6].
55 */
56 static inline void
57 syscall_get_arguments(struct task_struct *task, struct pt_regs *regs,
58 unsigned long *args)
59 {
60 unsigned long *inside_ptregs = &(regs->r0);
61 unsigned int n = 6;
62 unsigned int i = 0;
63
64 while (n--) {
65 args[i++] = (*inside_ptregs);
66 inside_ptregs--;
67 }
68 }
69
70 static inline int
71 syscall_get_arch(struct task_struct *task)
72 {
73 return IS_ENABLED(CONFIG_ISA_ARCOMPACT)
74 ? (IS_ENABLED(CONFIG_CPU_BIG_ENDIAN)
75 ? AUDIT_ARCH_ARCOMPACTBE : AUDIT_ARCH_ARCOMPACT)
76 : (IS_ENABLED(CONFIG_CPU_BIG_ENDIAN)
77 ? AUDIT_ARCH_ARCV2BE : AUDIT_ARCH_ARCV2);
78 }
79
80 #endif
81
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