xref: /openbmc/linux/arch/arc/include/asm/syscall.h (revision 151f4e2b)
1 /*
2  * Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com)
3  *
4  * This program is free software; you can redistribute it and/or modify
5  * it under the terms of the GNU General Public License version 2 as
6  * published by the Free Software Foundation.
7  */
8 
9 #ifndef _ASM_ARC_SYSCALL_H
10 #define _ASM_ARC_SYSCALL_H  1
11 
12 #include <uapi/linux/audit.h>
13 #include <linux/err.h>
14 #include <linux/sched.h>
15 #include <asm/unistd.h>
16 #include <asm/ptrace.h>		/* in_syscall() */
17 
18 static inline long
19 syscall_get_nr(struct task_struct *task, struct pt_regs *regs)
20 {
21 	if (user_mode(regs) && in_syscall(regs))
22 		return regs->r8;
23 	else
24 		return -1;
25 }
26 
27 static inline void
28 syscall_rollback(struct task_struct *task, struct pt_regs *regs)
29 {
30 	regs->r0 = regs->orig_r0;
31 }
32 
33 static inline long
34 syscall_get_error(struct task_struct *task, struct pt_regs *regs)
35 {
36 	/* 0 if syscall succeeded, otherwise -Errorcode */
37 	return IS_ERR_VALUE(regs->r0) ? regs->r0 : 0;
38 }
39 
40 static inline long
41 syscall_get_return_value(struct task_struct *task, struct pt_regs *regs)
42 {
43 	return regs->r0;
44 }
45 
46 static inline void
47 syscall_set_return_value(struct task_struct *task, struct pt_regs *regs,
48 			 int error, long val)
49 {
50 	regs->r0 = (long) error ?: val;
51 }
52 
53 /*
54  * @i:      argument index [0,5]
55  * @n:      number of arguments; n+i must be [1,6].
56  */
57 static inline void
58 syscall_get_arguments(struct task_struct *task, struct pt_regs *regs,
59 		      unsigned long *args)
60 {
61 	unsigned long *inside_ptregs = &(regs->r0);
62 	unsigned int n = 6;
63 	unsigned int i = 0;
64 
65 	while (n--) {
66 		args[i++] = (*inside_ptregs);
67 		inside_ptregs--;
68 	}
69 }
70 
71 static inline int
72 syscall_get_arch(struct task_struct *task)
73 {
74 	return IS_ENABLED(CONFIG_ISA_ARCOMPACT)
75 		? (IS_ENABLED(CONFIG_CPU_BIG_ENDIAN)
76 			? AUDIT_ARCH_ARCOMPACTBE : AUDIT_ARCH_ARCOMPACT)
77 		: (IS_ENABLED(CONFIG_CPU_BIG_ENDIAN)
78 			? AUDIT_ARCH_ARCV2BE : AUDIT_ARCH_ARCV2);
79 }
80 
81 #endif
82