1 /* SPDX-License-Identifier: GPL-2.0-only */
3 * Copyright (C) 2012 ARM Ltd.
5 #ifndef __ASM_SYSCALL_H
6 #define __ASM_SYSCALL_H
8 #include <uapi/linux/audit.h>
9 #include <linux/compat.h>
10 #include <linux/err.h>
12 typedef long (*syscall_fn_t)(const struct pt_regs *regs);
14 extern const syscall_fn_t sys_call_table[];
17 extern const syscall_fn_t compat_sys_call_table[];
20 static inline int syscall_get_nr(struct task_struct *task,
23 return regs->syscallno;
26 static inline void syscall_rollback(struct task_struct *task,
29 regs->regs[0] = regs->orig_x0;
33 static inline long syscall_get_error(struct task_struct *task,
36 unsigned long error = regs->regs[0];
38 if (is_compat_thread(task_thread_info(task)))
39 error = sign_extend64(error, 31);
41 return IS_ERR_VALUE(error) ? error : 0;
44 static inline long syscall_get_return_value(struct task_struct *task,
50 static inline void syscall_set_return_value(struct task_struct *task,
57 if (is_compat_thread(task_thread_info(task)))
58 val = lower_32_bits(val);
63 #define SYSCALL_MAX_ARGS 6
65 static inline void syscall_get_arguments(struct task_struct *task,
69 args[0] = regs->orig_x0;
72 memcpy(args, ®s->regs[1], 5 * sizeof(args[0]));
75 static inline void syscall_set_arguments(struct task_struct *task,
77 const unsigned long *args)
79 regs->orig_x0 = args[0];
82 memcpy(®s->regs[1], args, 5 * sizeof(args[0]));
86 * We don't care about endianness (__AUDIT_ARCH_LE bit) here because
87 * AArch64 has the same system calls both on little- and big- endian.
89 static inline int syscall_get_arch(struct task_struct *task)
91 if (is_compat_thread(task_thread_info(task)))
92 return AUDIT_ARCH_ARM;
94 return AUDIT_ARCH_AARCH64;
97 #endif /* __ASM_SYSCALL_H */