xref: /linux/arch/loongarch/include/asm/syscall.h (revision 0fdebc5ec2ca492d69df2d93a6a7abade4941aae) 
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_rollback(struct task_struct *task,
30 				    struct pt_regs *regs)
31 {
32         regs->regs[4] = regs->orig_a0;
33 }
34 
35 static inline long syscall_get_error(struct task_struct *task,
36 				     struct pt_regs *regs)
37 {
38 	unsigned long error = regs->regs[4];
39 
40 	return IS_ERR_VALUE(error) ? error : 0;
41 }
42 
43 static inline long syscall_get_return_value(struct task_struct *task,
44 					    struct pt_regs *regs)
45 {
46 	return regs->regs[4];
47 }
48 
49 static inline void syscall_set_return_value(struct task_struct *task,
50 					    struct pt_regs *regs,
51 					    int error, long val)
52 {
53 	regs->regs[4] = (long) error ? error : val;
54 }
55 
56 static inline void syscall_get_arguments(struct task_struct *task,
57 					 struct pt_regs *regs,
58 					 unsigned long *args)
59 {
60 	args[0] = regs->orig_a0;
61 	memcpy(&args[1], &regs->regs[5], 5 * sizeof(long));
62 }
63 
64 static inline int syscall_get_arch(struct task_struct *task)
65 {
66 	return AUDIT_ARCH_LOONGARCH64;
67 }
68 
69 static inline bool arch_syscall_is_vdso_sigreturn(struct pt_regs *regs)
70 {
71 	return false;
72 }
73 
74 #endif	/* __ASM_LOONGARCH_SYSCALL_H */
75