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 static inline long
syscall_get_nr(struct task_struct * task,struct pt_regs * regs)16 syscall_get_nr(struct task_struct *task, struct pt_regs *regs)
17 {
18 if (user_mode(regs) && in_syscall(regs))
19 return regs->r8;
20 else
21 return -1;
22 }
23
24 static inline void
syscall_rollback(struct task_struct * task,struct pt_regs * regs)25 syscall_rollback(struct task_struct *task, struct pt_regs *regs)
26 {
27 regs->r0 = regs->orig_r0;
28 }
29
30 static inline long
syscall_get_error(struct task_struct * task,struct pt_regs * regs)31 syscall_get_error(struct task_struct *task, struct pt_regs *regs)
32 {
33 /* 0 if syscall succeeded, otherwise -Errorcode */
34 return IS_ERR_VALUE(regs->r0) ? regs->r0 : 0;
35 }
36
37 static inline long
syscall_get_return_value(struct task_struct * task,struct pt_regs * regs)38 syscall_get_return_value(struct task_struct *task, struct pt_regs *regs)
39 {
40 return regs->r0;
41 }
42
43 static inline void
syscall_set_return_value(struct task_struct * task,struct pt_regs * regs,int error,long val)44 syscall_set_return_value(struct task_struct *task, struct pt_regs *regs,
45 int error, long val)
46 {
47 regs->r0 = (long) error ?: val;
48 }
49
50 /*
51 * @i: argument index [0,5]
52 * @n: number of arguments; n+i must be [1,6].
53 */
54 static inline void
syscall_get_arguments(struct task_struct * task,struct pt_regs * regs,unsigned long * args)55 syscall_get_arguments(struct task_struct *task, struct pt_regs *regs,
56 unsigned long *args)
57 {
58 unsigned long *inside_ptregs = &(regs->r0);
59 unsigned int n = 6;
60 unsigned int i = 0;
61
62 while (n--) {
63 args[i++] = (*inside_ptregs);
64 inside_ptregs--;
65 }
66 }
67
68 static inline int
syscall_get_arch(struct task_struct * task)69 syscall_get_arch(struct task_struct *task)
70 {
71 return IS_ENABLED(CONFIG_ISA_ARCOMPACT)
72 ? (IS_ENABLED(CONFIG_CPU_BIG_ENDIAN)
73 ? AUDIT_ARCH_ARCOMPACTBE : AUDIT_ARCH_ARCOMPACT)
74 : (IS_ENABLED(CONFIG_CPU_BIG_ENDIAN)
75 ? AUDIT_ARCH_ARCV2BE : AUDIT_ARCH_ARCV2);
76 }
77
78 #endif
79
