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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
22
23
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_pt_regs_flag(regs, PIF_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 AUDIT_ARCH_S390X;
99}
100#endif
101