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
syscall_get_arch(struct task_struct * task)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
syscall_get_nr(struct task_struct * task,struct pt_regs * regs)25 static inline long syscall_get_nr(struct task_struct *task,
26 struct pt_regs *regs)
27 {
28 return regs->syscall;
29 }
30
syscall_rollback(struct task_struct * task,struct pt_regs * regs)31 static inline void syscall_rollback(struct task_struct *task,
32 struct pt_regs *regs)
33 {
34 /* Do nothing. */
35 }
36
syscall_get_error(struct task_struct * task,struct pt_regs * regs)37 static inline long syscall_get_error(struct task_struct *task,
38 struct pt_regs *regs)
39 {
40 /* 0 if syscall succeeded, otherwise -Errorcode */
41 return IS_ERR_VALUE(regs->areg[2]) ? regs->areg[2] : 0;
42 }
43
syscall_get_return_value(struct task_struct * task,struct pt_regs * regs)44 static inline long syscall_get_return_value(struct task_struct *task,
45 struct pt_regs *regs)
46 {
47 return regs->areg[2];
48 }
49
syscall_set_return_value(struct task_struct * task,struct pt_regs * regs,int error,long val)50 static inline void syscall_set_return_value(struct task_struct *task,
51 struct pt_regs *regs,
52 int error, long val)
53 {
54 regs->areg[2] = (long) error ? error : val;
55 }
56
57 #define SYSCALL_MAX_ARGS 6
58 #define XTENSA_SYSCALL_ARGUMENT_REGS {6, 3, 4, 5, 8, 9}
59
syscall_get_arguments(struct task_struct * task,struct pt_regs * regs,unsigned long * args)60 static inline void syscall_get_arguments(struct task_struct *task,
61 struct pt_regs *regs,
62 unsigned long *args)
63 {
64 static const unsigned int reg[] = XTENSA_SYSCALL_ARGUMENT_REGS;
65 unsigned int i;
66
67 for (i = 0; i < 6; ++i)
68 args[i] = regs->areg[reg[i]];
69 }
70
71 asmlinkage long xtensa_rt_sigreturn(void);
72 asmlinkage long xtensa_shmat(int, char __user *, int);
73 asmlinkage long xtensa_fadvise64_64(int, int,
74 unsigned long long, unsigned long long);
75
76 #endif
77