Linux kernel mirror (for testing)
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1/* SPDX-License-Identifier: GPL-2.0 */
2/*
3 * Access to user system call parameters and results
4 *
5 * Copyright IBM Corp. 2008
6 * Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com)
7 */
8
9#ifndef _ASM_SYSCALL_H
10#define _ASM_SYSCALL_H 1
11
12#include <uapi/linux/audit.h>
13#include <linux/sched.h>
14#include <linux/err.h>
15#include <asm/ptrace.h>
16
17extern const unsigned long sys_call_table[];
18extern const unsigned long sys_call_table_emu[];
19
20static inline long syscall_get_nr(struct task_struct *task,
21 struct pt_regs *regs)
22{
23 return test_pt_regs_flag(regs, PIF_SYSCALL) ?
24 (regs->int_code & 0xffff) : -1;
25}
26
27static inline void syscall_rollback(struct task_struct *task,
28 struct pt_regs *regs)
29{
30 regs->gprs[2] = regs->orig_gpr2;
31}
32
33static inline long syscall_get_error(struct task_struct *task,
34 struct pt_regs *regs)
35{
36 return IS_ERR_VALUE(regs->gprs[2]) ? regs->gprs[2] : 0;
37}
38
39static inline long syscall_get_return_value(struct task_struct *task,
40 struct pt_regs *regs)
41{
42 return regs->gprs[2];
43}
44
45static inline void syscall_set_return_value(struct task_struct *task,
46 struct pt_regs *regs,
47 int error, long val)
48{
49 regs->gprs[2] = error ? error : val;
50}
51
52static inline void syscall_get_arguments(struct task_struct *task,
53 struct pt_regs *regs,
54 unsigned long *args)
55{
56 unsigned long mask = -1UL;
57 unsigned int n = 6;
58
59#ifdef CONFIG_COMPAT
60 if (test_tsk_thread_flag(task, TIF_31BIT))
61 mask = 0xffffffff;
62#endif
63 while (n-- > 0)
64 if (n > 0)
65 args[n] = regs->gprs[2 + n] & mask;
66
67 args[0] = regs->orig_gpr2 & mask;
68}
69
70static inline void syscall_set_arguments(struct task_struct *task,
71 struct pt_regs *regs,
72 const unsigned long *args)
73{
74 unsigned int n = 6;
75
76 while (n-- > 0)
77 if (n > 0)
78 regs->gprs[2 + n] = args[n];
79 regs->orig_gpr2 = args[0];
80}
81
82static inline int syscall_get_arch(struct task_struct *task)
83{
84#ifdef CONFIG_COMPAT
85 if (test_tsk_thread_flag(task, TIF_31BIT))
86 return AUDIT_ARCH_S390;
87#endif
88 return AUDIT_ARCH_S390X;
89}
90#endif /* _ASM_SYSCALL_H */