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	if (IS_ENABLED(CONFIG_AEABI) && !IS_ENABLED(CONFIG_OABI_COMPAT))
26		return task_thread_info(task)->abi_syscall;
27
28	if (task_thread_info(task)->abi_syscall == -1)
29		return -1;
30
31	return task_thread_info(task)->abi_syscall & __NR_SYSCALL_MASK;
32}
33
34static inline bool __in_oabi_syscall(struct task_struct *task)
35{
36	return IS_ENABLED(CONFIG_OABI_COMPAT) &&
37		(task_thread_info(task)->abi_syscall & __NR_OABI_SYSCALL_BASE);
38}
39
40static inline bool in_oabi_syscall(void)
41{
42	return __in_oabi_syscall(current);
43}
44
45static inline void syscall_rollback(struct task_struct *task,
46				    struct pt_regs *regs)
47{
48	regs->ARM_r0 = regs->ARM_ORIG_r0;
49}
50
51static inline long syscall_get_error(struct task_struct *task,
52				     struct pt_regs *regs)
53{
54	unsigned long error = regs->ARM_r0;
55	return IS_ERR_VALUE(error) ? error : 0;
56}
57
58static inline long syscall_get_return_value(struct task_struct *task,
59					    struct pt_regs *regs)
60{
61	return regs->ARM_r0;
62}
63
64static inline void syscall_set_return_value(struct task_struct *task,
65					    struct pt_regs *regs,
66					    int error, long val)
67{
68	regs->ARM_r0 = (long) error ? error : val;
69}
70
71#define SYSCALL_MAX_ARGS 7
72
73static inline void syscall_get_arguments(struct task_struct *task,
74					 struct pt_regs *regs,
75					 unsigned long *args)
76{
77	args[0] = regs->ARM_ORIG_r0;
78	args++;
79
80	memcpy(args, &regs->ARM_r0 + 1, 5 * sizeof(args[0]));
81}
82
83static inline int syscall_get_arch(struct task_struct *task)
84{
85	/* ARM tasks don't change audit architectures on the fly. */
86	return AUDIT_ARCH_ARM;
87}
88
89#endif /* _ASM_ARM_SYSCALL_H */
90