1 /* SPDX-License-Identifier: GPL-2.0+ */
2 /*
3 * Author: Hanlu Li <lihanlu@loongson.cn>
4 * Huacai Chen <chenhuacai@loongson.cn>
5 *
6 * Copyright (C) 2020-2022 Loongson Technology Corporation Limited
7 */
8
9 #ifndef __ASM_LOONGARCH_SYSCALL_H
10 #define __ASM_LOONGARCH_SYSCALL_H
11
12 #include <linux/compiler.h>
13 #include <uapi/linux/audit.h>
14 #include <linux/elf-em.h>
15 #include <linux/kernel.h>
16 #include <linux/sched.h>
17 #include <linux/uaccess.h>
18 #include <asm/ptrace.h>
19 #include <asm/unistd.h>
20
21 extern void *sys_call_table[];
22
syscall_get_nr(struct task_struct * task,struct pt_regs * regs)23 static inline long syscall_get_nr(struct task_struct *task,
24 struct pt_regs *regs)
25 {
26 return regs->regs[11];
27 }
28
syscall_set_nr(struct task_struct * task,struct pt_regs * regs,int nr)29 static inline void syscall_set_nr(struct task_struct *task,
30 struct pt_regs *regs,
31 int nr)
32 {
33 regs->regs[11] = nr;
34 }
35
syscall_rollback(struct task_struct * task,struct pt_regs * regs)36 static inline void syscall_rollback(struct task_struct *task,
37 struct pt_regs *regs)
38 {
39 regs->regs[4] = regs->orig_a0;
40 }
41
syscall_get_error(struct task_struct * task,struct pt_regs * regs)42 static inline long syscall_get_error(struct task_struct *task,
43 struct pt_regs *regs)
44 {
45 unsigned long error = regs->regs[4];
46
47 return IS_ERR_VALUE(error) ? error : 0;
48 }
49
syscall_get_return_value(struct task_struct * task,struct pt_regs * regs)50 static inline long syscall_get_return_value(struct task_struct *task,
51 struct pt_regs *regs)
52 {
53 return regs->regs[4];
54 }
55
syscall_set_return_value(struct task_struct * task,struct pt_regs * regs,int error,long val)56 static inline void syscall_set_return_value(struct task_struct *task,
57 struct pt_regs *regs,
58 int error, long val)
59 {
60 regs->regs[4] = (long) error ? error : val;
61 }
62
syscall_get_arguments(struct task_struct * task,struct pt_regs * regs,unsigned long * args)63 static inline void syscall_get_arguments(struct task_struct *task,
64 struct pt_regs *regs,
65 unsigned long *args)
66 {
67 args[0] = regs->orig_a0;
68 memcpy(&args[1], ®s->regs[5], 5 * sizeof(long));
69 }
70
syscall_set_arguments(struct task_struct * task,struct pt_regs * regs,unsigned long * args)71 static inline void syscall_set_arguments(struct task_struct *task,
72 struct pt_regs *regs,
73 unsigned long *args)
74 {
75 regs->orig_a0 = args[0];
76 memcpy(®s->regs[5], &args[1], 5 * sizeof(long));
77 }
78
syscall_get_arch(struct task_struct * task)79 static inline int syscall_get_arch(struct task_struct *task)
80 {
81 return AUDIT_ARCH_LOONGARCH64;
82 }
83
arch_syscall_is_vdso_sigreturn(struct pt_regs * regs)84 static inline bool arch_syscall_is_vdso_sigreturn(struct pt_regs *regs)
85 {
86 return false;
87 }
88
89 #endif /* __ASM_LOONGARCH_SYSCALL_H */
90