xref: /linux/arch/loongarch/include/asm/syscall.h (revision 25489a4f556414445d342951615178368ee45cde) 
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 
23 static inline long syscall_get_nr(struct task_struct *task,
24 				  struct pt_regs *regs)
25 {
26 	return regs->regs[11];
27 }
28 
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 
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 
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 
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 
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 
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], &regs->regs[5], 5 * sizeof(long));
69 }
70 
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(&regs->regs[5], &args[1], 5 * sizeof(long));
77 }
78 
79 static inline int syscall_get_arch(struct task_struct *task)
80 {
81 	return AUDIT_ARCH_LOONGARCH64;
82 }
83 
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