syscall.h

 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
17static inline int syscall_get_arch(struct task_struct *task)
18{
19	return AUDIT_ARCH_XTENSA;
20}
21
22typedef void (*syscall_t)(void);
23extern syscall_t sys_call_table[];
24
25static inline long syscall_get_nr(struct task_struct *task,
26				  struct pt_regs *regs)
27{
28	return regs->syscall;
29}
30
31static inline void syscall_set_nr(struct task_struct *task,
32				  struct pt_regs *regs,
33				  int nr)
34{
35	regs->syscall = nr;
36}
37
38static inline void syscall_rollback(struct task_struct *task,
39				    struct pt_regs *regs)
40{
41	/* Do nothing. */
42}
43
44static 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
51static inline long syscall_get_return_value(struct task_struct *task,
52					    struct pt_regs *regs)
53{
54	return regs->areg[2];
55}
56
57static 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
67static 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
78static 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
89asmlinkage long xtensa_rt_sigreturn(void);
90asmlinkage long xtensa_shmat(int, char __user *, int);
91asmlinkage long xtensa_fadvise64_64(int, int,
92				    unsigned long long, unsigned long long);
93
94#endif