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;
32 static inline long syscall_get_return_value(struct task_struct *task,
35 unsigned long val = regs->regs[0];
37 if (is_compat_thread(task_thread_info(task)))
38 val = sign_extend64(val, 31);
43 static inline long syscall_get_error(struct task_struct *task,
46 unsigned long error = syscall_get_return_value(task, regs);
48 return IS_ERR_VALUE(error) ? error : 0;
51 static inline void syscall_set_return_value(struct task_struct *task,
58 if (is_compat_thread(task_thread_info(task)))
59 val = lower_32_bits(val);
64 #define SYSCALL_MAX_ARGS 6
66 static inline void syscall_get_arguments(struct task_struct *task,
70 args[0] = regs->orig_x0;
73 memcpy(args, ®s->regs[1], 5 * sizeof(args[0]));
76 static inline void syscall_set_arguments(struct task_struct *task,
78 const unsigned long *args)
80 regs->orig_x0 = args[0];
83 memcpy(®s->regs[1], args, 5 * sizeof(args[0]));
87 * We don't care about endianness (__AUDIT_ARCH_LE bit) here because
88 * AArch64 has the same system calls both on little- and big- endian.
90 static inline int syscall_get_arch(struct task_struct *task)
92 if (is_compat_thread(task_thread_info(task)))
93 return AUDIT_ARCH_ARM;
95 return AUDIT_ARCH_AARCH64;
98 #endif /* __ASM_SYSCALL_H */