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1/*
2 * Access to user system call parameters and results
3 *
4 * Copyright IBM Corp. 2008
5 * Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com)
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License (version 2 only)
9 * as published by the Free Software Foundation.
10 */
11
12#ifndef _ASM_SYSCALL_H
13#define _ASM_SYSCALL_H 1
14
15#include <linux/sched.h>
16#include <linux/err.h>
17#include <asm/ptrace.h>
18
19/*
20 * The syscall table always contains 32 bit pointers since we know that the
21 * address of the function to be called is (way) below 4GB. So the "int"
22 * type here is what we want [need] for both 32 bit and 64 bit systems.
23 */
24extern const unsigned int sys_call_table[];
25
26static inline long syscall_get_nr(struct task_struct *task,
27 struct pt_regs *regs)
28{
29 return test_tsk_thread_flag(task, TIF_SYSCALL) ?
30 (regs->int_code & 0xffff) : -1;
31}
32
33static inline void syscall_rollback(struct task_struct *task,
34 struct pt_regs *regs)
35{
36 regs->gprs[2] = regs->orig_gpr2;
37}
38
39static inline long syscall_get_error(struct task_struct *task,
40 struct pt_regs *regs)
41{
42 return IS_ERR_VALUE(regs->gprs[2]) ? regs->gprs[2] : 0;
43}
44
45static inline long syscall_get_return_value(struct task_struct *task,
46 struct pt_regs *regs)
47{
48 return regs->gprs[2];
49}
50
51static inline void syscall_set_return_value(struct task_struct *task,
52 struct pt_regs *regs,
53 int error, long val)
54{
55 regs->gprs[2] = error ? -error : val;
56}
57
58static inline void syscall_get_arguments(struct task_struct *task,
59 struct pt_regs *regs,
60 unsigned int i, unsigned int n,
61 unsigned long *args)
62{
63 unsigned long mask = -1UL;
64
65 BUG_ON(i + n > 6);
66#ifdef CONFIG_COMPAT
67 if (test_tsk_thread_flag(task, TIF_31BIT))
68 mask = 0xffffffff;
69#endif
70 while (n-- > 0)
71 if (i + n > 0)
72 args[n] = regs->gprs[2 + i + n] & mask;
73 if (i == 0)
74 args[0] = regs->orig_gpr2 & mask;
75}
76
77static inline void syscall_set_arguments(struct task_struct *task,
78 struct pt_regs *regs,
79 unsigned int i, unsigned int n,
80 const unsigned long *args)
81{
82 BUG_ON(i + n > 6);
83 while (n-- > 0)
84 if (i + n > 0)
85 regs->gprs[2 + i + n] = args[n];
86 if (i == 0)
87 regs->orig_gpr2 = args[0];
88}
89
90#endif /* _ASM_SYSCALL_H */
1/*
2 * Access to user system call parameters and results
3 *
4 * Copyright IBM Corp. 2008
5 * Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com)
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License (version 2 only)
9 * as published by the Free Software Foundation.
10 */
11
12#ifndef _ASM_SYSCALL_H
13#define _ASM_SYSCALL_H 1
14
15#include <uapi/linux/audit.h>
16#include <linux/sched.h>
17#include <linux/err.h>
18#include <asm/ptrace.h>
19
20/*
21 * The syscall table always contains 32 bit pointers since we know that the
22 * address of the function to be called is (way) below 4GB. So the "int"
23 * type here is what we want [need] for both 32 bit and 64 bit systems.
24 */
25extern const unsigned int sys_call_table[];
26extern const unsigned int sys_call_table_emu[];
27
28static inline long syscall_get_nr(struct task_struct *task,
29 struct pt_regs *regs)
30{
31 return test_tsk_thread_flag(task, TIF_SYSCALL) ?
32 (regs->int_code & 0xffff) : -1;
33}
34
35static inline void syscall_rollback(struct task_struct *task,
36 struct pt_regs *regs)
37{
38 regs->gprs[2] = regs->orig_gpr2;
39}
40
41static inline long syscall_get_error(struct task_struct *task,
42 struct pt_regs *regs)
43{
44 return IS_ERR_VALUE(regs->gprs[2]) ? regs->gprs[2] : 0;
45}
46
47static inline long syscall_get_return_value(struct task_struct *task,
48 struct pt_regs *regs)
49{
50 return regs->gprs[2];
51}
52
53static inline void syscall_set_return_value(struct task_struct *task,
54 struct pt_regs *regs,
55 int error, long val)
56{
57 regs->gprs[2] = error ? -error : val;
58}
59
60static inline void syscall_get_arguments(struct task_struct *task,
61 struct pt_regs *regs,
62 unsigned int i, unsigned int n,
63 unsigned long *args)
64{
65 unsigned long mask = -1UL;
66
67 BUG_ON(i + n > 6);
68#ifdef CONFIG_COMPAT
69 if (test_tsk_thread_flag(task, TIF_31BIT))
70 mask = 0xffffffff;
71#endif
72 while (n-- > 0)
73 if (i + n > 0)
74 args[n] = regs->gprs[2 + i + n] & mask;
75 if (i == 0)
76 args[0] = regs->orig_gpr2 & mask;
77}
78
79static inline void syscall_set_arguments(struct task_struct *task,
80 struct pt_regs *regs,
81 unsigned int i, unsigned int n,
82 const unsigned long *args)
83{
84 BUG_ON(i + n > 6);
85 while (n-- > 0)
86 if (i + n > 0)
87 regs->gprs[2 + i + n] = args[n];
88 if (i == 0)
89 regs->orig_gpr2 = args[0];
90}
91
92static inline int syscall_get_arch(void)
93{
94#ifdef CONFIG_COMPAT
95 if (test_tsk_thread_flag(current, TIF_31BIT))
96 return AUDIT_ARCH_S390;
97#endif
98 return sizeof(long) == 8 ? AUDIT_ARCH_S390X : AUDIT_ARCH_S390;
99}
100#endif /* _ASM_SYSCALL_H */