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