1*4882a593Smuzhiyun /* SPDX-License-Identifier: GPL-2.0-only */
2*4882a593Smuzhiyun /*
3*4882a593Smuzhiyun * Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com)
4*4882a593Smuzhiyun */
5*4882a593Smuzhiyun
6*4882a593Smuzhiyun #ifndef _ASM_ARC_SYSCALL_H
7*4882a593Smuzhiyun #define _ASM_ARC_SYSCALL_H 1
8*4882a593Smuzhiyun
9*4882a593Smuzhiyun #include <uapi/linux/audit.h>
10*4882a593Smuzhiyun #include <linux/err.h>
11*4882a593Smuzhiyun #include <linux/sched.h>
12*4882a593Smuzhiyun #include <asm/unistd.h>
13*4882a593Smuzhiyun #include <asm/ptrace.h> /* in_syscall() */
14*4882a593Smuzhiyun
15*4882a593Smuzhiyun static inline long
syscall_get_nr(struct task_struct * task,struct pt_regs * regs)16*4882a593Smuzhiyun syscall_get_nr(struct task_struct *task, struct pt_regs *regs)
17*4882a593Smuzhiyun {
18*4882a593Smuzhiyun if (user_mode(regs) && in_syscall(regs))
19*4882a593Smuzhiyun return regs->r8;
20*4882a593Smuzhiyun else
21*4882a593Smuzhiyun return -1;
22*4882a593Smuzhiyun }
23*4882a593Smuzhiyun
24*4882a593Smuzhiyun static inline void
syscall_rollback(struct task_struct * task,struct pt_regs * regs)25*4882a593Smuzhiyun syscall_rollback(struct task_struct *task, struct pt_regs *regs)
26*4882a593Smuzhiyun {
27*4882a593Smuzhiyun regs->r0 = regs->orig_r0;
28*4882a593Smuzhiyun }
29*4882a593Smuzhiyun
30*4882a593Smuzhiyun static inline long
syscall_get_error(struct task_struct * task,struct pt_regs * regs)31*4882a593Smuzhiyun syscall_get_error(struct task_struct *task, struct pt_regs *regs)
32*4882a593Smuzhiyun {
33*4882a593Smuzhiyun /* 0 if syscall succeeded, otherwise -Errorcode */
34*4882a593Smuzhiyun return IS_ERR_VALUE(regs->r0) ? regs->r0 : 0;
35*4882a593Smuzhiyun }
36*4882a593Smuzhiyun
37*4882a593Smuzhiyun static inline long
syscall_get_return_value(struct task_struct * task,struct pt_regs * regs)38*4882a593Smuzhiyun syscall_get_return_value(struct task_struct *task, struct pt_regs *regs)
39*4882a593Smuzhiyun {
40*4882a593Smuzhiyun return regs->r0;
41*4882a593Smuzhiyun }
42*4882a593Smuzhiyun
43*4882a593Smuzhiyun static inline void
syscall_set_return_value(struct task_struct * task,struct pt_regs * regs,int error,long val)44*4882a593Smuzhiyun syscall_set_return_value(struct task_struct *task, struct pt_regs *regs,
45*4882a593Smuzhiyun int error, long val)
46*4882a593Smuzhiyun {
47*4882a593Smuzhiyun regs->r0 = (long) error ?: val;
48*4882a593Smuzhiyun }
49*4882a593Smuzhiyun
50*4882a593Smuzhiyun /*
51*4882a593Smuzhiyun * @i: argument index [0,5]
52*4882a593Smuzhiyun * @n: number of arguments; n+i must be [1,6].
53*4882a593Smuzhiyun */
54*4882a593Smuzhiyun static inline void
syscall_get_arguments(struct task_struct * task,struct pt_regs * regs,unsigned long * args)55*4882a593Smuzhiyun syscall_get_arguments(struct task_struct *task, struct pt_regs *regs,
56*4882a593Smuzhiyun unsigned long *args)
57*4882a593Smuzhiyun {
58*4882a593Smuzhiyun unsigned long *inside_ptregs = &(regs->r0);
59*4882a593Smuzhiyun unsigned int n = 6;
60*4882a593Smuzhiyun unsigned int i = 0;
61*4882a593Smuzhiyun
62*4882a593Smuzhiyun while (n--) {
63*4882a593Smuzhiyun args[i++] = (*inside_ptregs);
64*4882a593Smuzhiyun inside_ptregs--;
65*4882a593Smuzhiyun }
66*4882a593Smuzhiyun }
67*4882a593Smuzhiyun
68*4882a593Smuzhiyun static inline int
syscall_get_arch(struct task_struct * task)69*4882a593Smuzhiyun syscall_get_arch(struct task_struct *task)
70*4882a593Smuzhiyun {
71*4882a593Smuzhiyun return IS_ENABLED(CONFIG_ISA_ARCOMPACT)
72*4882a593Smuzhiyun ? (IS_ENABLED(CONFIG_CPU_BIG_ENDIAN)
73*4882a593Smuzhiyun ? AUDIT_ARCH_ARCOMPACTBE : AUDIT_ARCH_ARCOMPACT)
74*4882a593Smuzhiyun : (IS_ENABLED(CONFIG_CPU_BIG_ENDIAN)
75*4882a593Smuzhiyun ? AUDIT_ARCH_ARCV2BE : AUDIT_ARCH_ARCV2);
76*4882a593Smuzhiyun }
77*4882a593Smuzhiyun
78*4882a593Smuzhiyun #endif
79