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Thomas Gleixnercaab2772019-06-03 07:44:50 +02001/* SPDX-License-Identifier: GPL-2.0-only */
Marc Zyngierf27bb132012-03-05 11:49:33 +00002/*
3 * Copyright (C) 2012 ARM Ltd.
Marc Zyngierf27bb132012-03-05 11:49:33 +00004 */
5#ifndef __ASM_SYSCALL_H
6#define __ASM_SYSCALL_H
7
AKASHI Takahiro875cbf32014-07-04 08:28:30 +01008#include <uapi/linux/audit.h>
9#include <linux/compat.h>
Marc Zyngierf27bb132012-03-05 11:49:33 +000010#include <linux/err.h>
11
Sami Tolvanen8ef8f3682019-05-24 15:11:16 -070012typedef long (*syscall_fn_t)(const struct pt_regs *regs);
Mark Rutland27d83e62018-07-11 14:56:42 +010013
14extern const syscall_fn_t sys_call_table[];
Marc Zyngierf27bb132012-03-05 11:49:33 +000015
Mark Rutland3b714272018-07-11 14:56:45 +010016#ifdef CONFIG_COMPAT
17extern const syscall_fn_t compat_sys_call_table[];
18#endif
19
Marc Zyngierf27bb132012-03-05 11:49:33 +000020static inline int syscall_get_nr(struct task_struct *task,
21 struct pt_regs *regs)
22{
23 return regs->syscallno;
24}
25
26static inline void syscall_rollback(struct task_struct *task,
27 struct pt_regs *regs)
28{
29 regs->regs[0] = regs->orig_x0;
30}
31
32
33static inline long syscall_get_error(struct task_struct *task,
34 struct pt_regs *regs)
35{
36 unsigned long error = regs->regs[0];
Will Deacon15956682020-07-03 12:08:42 +010037
38 if (is_compat_thread(task_thread_info(task)))
39 error = sign_extend64(error, 31);
40
Marc Zyngierf27bb132012-03-05 11:49:33 +000041 return IS_ERR_VALUE(error) ? error : 0;
42}
43
44static inline long syscall_get_return_value(struct task_struct *task,
45 struct pt_regs *regs)
46{
47 return regs->regs[0];
48}
49
50static inline void syscall_set_return_value(struct task_struct *task,
51 struct pt_regs *regs,
52 int error, long val)
53{
Will Deacon15956682020-07-03 12:08:42 +010054 if (error)
55 val = error;
56
57 if (is_compat_thread(task_thread_info(task)))
58 val = lower_32_bits(val);
59
60 regs->regs[0] = val;
Marc Zyngierf27bb132012-03-05 11:49:33 +000061}
62
63#define SYSCALL_MAX_ARGS 6
64
65static inline void syscall_get_arguments(struct task_struct *task,
66 struct pt_regs *regs,
Marc Zyngierf27bb132012-03-05 11:49:33 +000067 unsigned long *args)
68{
Steven Rostedt (Red Hat)b35f5492016-11-07 16:26:37 -050069 args[0] = regs->orig_x0;
70 args++;
AKASHI Takahiro7b22c032013-10-03 06:47:44 +010071
Steven Rostedt (Red Hat)b35f5492016-11-07 16:26:37 -050072 memcpy(args, &regs->regs[1], 5 * sizeof(args[0]));
Marc Zyngierf27bb132012-03-05 11:49:33 +000073}
74
75static inline void syscall_set_arguments(struct task_struct *task,
76 struct pt_regs *regs,
Marc Zyngierf27bb132012-03-05 11:49:33 +000077 const unsigned long *args)
78{
Steven Rostedt (VMware)32d92582019-03-27 20:07:31 -040079 regs->orig_x0 = args[0];
80 args++;
AKASHI Takahiro7b22c032013-10-03 06:47:44 +010081
Steven Rostedt (VMware)32d92582019-03-27 20:07:31 -040082 memcpy(&regs->regs[1], args, 5 * sizeof(args[0]));
Marc Zyngierf27bb132012-03-05 11:49:33 +000083}
84
AKASHI Takahiro875cbf32014-07-04 08:28:30 +010085/*
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.
88 */
Dmitry V. Levin16add412019-03-18 02:30:18 +030089static inline int syscall_get_arch(struct task_struct *task)
AKASHI Takahiro875cbf32014-07-04 08:28:30 +010090{
Dmitry V. Levin16add412019-03-18 02:30:18 +030091 if (is_compat_thread(task_thread_info(task)))
AKASHI Takahiro875cbf32014-07-04 08:28:30 +010092 return AUDIT_ARCH_ARM;
93
94 return AUDIT_ARCH_AARCH64;
95}
96
Marc Zyngierf27bb132012-03-05 11:49:33 +000097#endif /* __ASM_SYSCALL_H */