2 * Copyright (C) 2012 ARM Ltd.
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License version 2 as
6 * published by the Free Software Foundation.
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
11 * GNU General Public License for more details.
13 * You should have received a copy of the GNU General Public License
14 * along with this program. If not, see <http://www.gnu.org/licenses/>.
16 #ifndef __ASM_SYSCALL_H
17 #define __ASM_SYSCALL_H
19 #include <uapi/linux/audit.h>
20 #include <linux/compat.h>
21 #include <linux/err.h>
23 typedef long (*syscall_fn_t)(const struct pt_regs *regs);
25 extern const syscall_fn_t sys_call_table[];
28 extern const syscall_fn_t compat_sys_call_table[];
31 static inline int syscall_get_nr(struct task_struct *task,
34 return regs->syscallno;
37 static inline void syscall_rollback(struct task_struct *task,
40 regs->regs[0] = regs->orig_x0;
44 static inline long syscall_get_error(struct task_struct *task,
47 unsigned long error = regs->regs[0];
48 return IS_ERR_VALUE(error) ? error : 0;
51 static inline long syscall_get_return_value(struct task_struct *task,
57 static inline void syscall_set_return_value(struct task_struct *task,
61 regs->regs[0] = (long) error ? error : 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 */