1 /*
2  * This file is subject to the terms and conditions of the GNU General Public
3  * License.  See the file "COPYING" in the main directory of this archive
4  * for more details.
5  *
6  * Copyright (C) 2001 - 2007 Tensilica Inc.
7  * Copyright (C) 2018 Cadence Design Systems Inc.
8  */
9 
10 #ifndef _ASM_SYSCALL_H
11 #define _ASM_SYSCALL_H
12 
13 #include <linux/err.h>
14 #include <asm/ptrace.h>
15 #include <uapi/linux/audit.h>
16 
17 static inline int syscall_get_arch(struct task_struct *task)
18 {
19 	return AUDIT_ARCH_XTENSA;
20 }
21 
22 typedef void (*syscall_t)(void);
23 extern syscall_t sys_call_table[];
24 
25 static inline long syscall_get_nr(struct task_struct *task,
26 				  struct pt_regs *regs)
27 {
28 	return regs->syscall;
29 }
30 
31 static inline void syscall_set_nr(struct task_struct *task,
32 				  struct pt_regs *regs,
33 				  int nr)
34 {
35 	regs->syscall = nr;
36 }
37 
38 static inline void syscall_rollback(struct task_struct *task,
39 				    struct pt_regs *regs)
40 {
41 	/* Do nothing. */
42 }
43 
44 static inline long syscall_get_error(struct task_struct *task,
45 				     struct pt_regs *regs)
46 {
47 	/* 0 if syscall succeeded, otherwise -Errorcode */
48 	return IS_ERR_VALUE(regs->areg[2]) ? regs->areg[2] : 0;
49 }
50 
51 static inline long syscall_get_return_value(struct task_struct *task,
52 					    struct pt_regs *regs)
53 {
54 	return regs->areg[2];
55 }
56 
57 static inline void syscall_set_return_value(struct task_struct *task,
58 					    struct pt_regs *regs,
59 					    int error, long val)
60 {
61 	regs->areg[2] = (long) error ? error : val;
62 }
63 
64 #define SYSCALL_MAX_ARGS 6
65 #define XTENSA_SYSCALL_ARGUMENT_REGS {6, 3, 4, 5, 8, 9}
66 
67 static inline void syscall_get_arguments(struct task_struct *task,
68 					 struct pt_regs *regs,
69 					 unsigned long *args)
70 {
71 	static const unsigned int reg[] = XTENSA_SYSCALL_ARGUMENT_REGS;
72 	unsigned int i;
73 
74 	for (i = 0; i < 6; ++i)
75 		args[i] = regs->areg[reg[i]];
76 }
77 
78 static inline void syscall_set_arguments(struct task_struct *task,
79 					 struct pt_regs *regs,
80 					 const unsigned long *args)
81 {
82 	static const unsigned int reg[] = XTENSA_SYSCALL_ARGUMENT_REGS;
83 	unsigned int i;
84 
85 	for (i = 0; i < 6; ++i)
86 		regs->areg[reg[i]] = args[i];
87 }
88 
89 asmlinkage long xtensa_rt_sigreturn(void);
90 asmlinkage long xtensa_shmat(int, char __user *, int);
91 asmlinkage long xtensa_fadvise64_64(int, int,
92 				    unsigned long long, unsigned long long);
93 
94 #endif
95