1/* SPDX-License-Identifier: GPL-2.0 */
2/*
3 * Access to user system call parameters and results
4 *
5 * See asm-generic/syscall.h for descriptions of what we must do here.
6 */
7
8#ifndef _ASM_ARM_SYSCALL_H
9#define _ASM_ARM_SYSCALL_H
10
11#include <uapi/linux/audit.h> /* for AUDIT_ARCH_* */
12#include <linux/elf.h> /* for ELF_EM */
13#include <linux/err.h>
14#include <linux/sched.h>
15
16#include <asm/unistd.h>
17
18#define NR_syscalls (__NR_syscalls)
19
20extern const unsigned long sys_call_table[];
21
22static inline int syscall_get_nr(struct task_struct *task,
23				 struct pt_regs *regs)
24{
25	return task_thread_info(task)->syscall;
26}
27
28static inline void syscall_rollback(struct task_struct *task,
29				    struct pt_regs *regs)
30{
31	regs->ARM_r0 = regs->ARM_ORIG_r0;
32}
33
34static inline long syscall_get_error(struct task_struct *task,
35				     struct pt_regs *regs)
36{
37	unsigned long error = regs->ARM_r0;
38	return IS_ERR_VALUE(error) ? error : 0;
39}
40
41static inline long syscall_get_return_value(struct task_struct *task,
42					    struct pt_regs *regs)
43{
44	return regs->ARM_r0;
45}
46
47static inline void syscall_set_return_value(struct task_struct *task,
48					    struct pt_regs *regs,
49					    int error, long val)
50{
51	regs->ARM_r0 = (long) error ? error : val;
52}
53
54#define SYSCALL_MAX_ARGS 7
55
56static inline void syscall_get_arguments(struct task_struct *task,
57					 struct pt_regs *regs,
58					 unsigned long *args)
59{
60	args[0] = regs->ARM_ORIG_r0;
61	args++;
62
63	memcpy(args, &regs->ARM_r0 + 1, 5 * sizeof(args[0]));
64}
65
66static inline void syscall_set_arguments(struct task_struct *task,
67					 struct pt_regs *regs,
68					 const unsigned long *args)
69{
70	regs->ARM_ORIG_r0 = args[0];
71	args++;
72
73	memcpy(&regs->ARM_r0 + 1, args, 5 * sizeof(args[0]));
74}
75
76static inline int syscall_get_arch(struct task_struct *task)
77{
78	/* ARM tasks don't change audit architectures on the fly. */
79	return AUDIT_ARCH_ARM;
80}
81
82#endif /* _ASM_ARM_SYSCALL_H */
83