xref: /linux/arch/arc/include/asm/syscall.h (revision 4f2c0a4acffbec01079c28f839422e64ddeff004)
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
syscall_get_nr(struct task_struct * task,struct pt_regs * regs)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
syscall_rollback(struct task_struct * task,struct pt_regs * regs)27 syscall_rollback(struct task_struct *task, struct pt_regs *regs)
28 {
29 	regs->r0 = regs->orig_r0;
30 }
31 
32 static inline long
syscall_get_error(struct task_struct * task,struct pt_regs * regs)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
syscall_get_return_value(struct task_struct * task,struct pt_regs * regs)40 syscall_get_return_value(struct task_struct *task, struct pt_regs *regs)
41 {
42 	return regs->r0;
43 }
44 
45 static inline void
syscall_set_return_value(struct task_struct * task,struct pt_regs * regs,int error,long val)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
syscall_get_arguments(struct task_struct * task,struct pt_regs * regs,unsigned long * args)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
syscall_get_arch(struct task_struct * task)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