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[IA64] utrace syscall.h support for ia64
[~andy/linux] / arch / ia64 / include / asm / syscall.h
1 /*
2  * Access to user system call parameters and results
3  *
4  * Copyright (C) 2008 Intel Corp.  Shaohua Li <shaohua.li@intel.com>
5  *
6  * This copyrighted material is made available to anyone wishing to use,
7  * modify, copy, or redistribute it subject to the terms and conditions
8  * of the GNU General Public License v.2.
9  *
10  * See asm-generic/syscall.h for descriptions of what we must do here.
11  */
12
13 #ifndef _ASM_SYSCALL_H
14 #define _ASM_SYSCALL_H  1
15
16 #include <linux/sched.h>
17 #include <linux/err.h>
18
19 static inline long syscall_get_nr(struct task_struct *task,
20                                   struct pt_regs *regs)
21 {
22         BUG_ON(IS_IA32_PROCESS(regs));
23
24         if ((long)regs->cr_ifs < 0) /* Not a syscall */
25                 return -1;
26         return regs->r15;
27 }
28
29 static inline void syscall_rollback(struct task_struct *task,
30                                     struct pt_regs *regs)
31 {
32         BUG_ON(IS_IA32_PROCESS(regs));
33         /* do nothing */
34 }
35
36 static inline long syscall_get_error(struct task_struct *task,
37                                      struct pt_regs *regs)
38 {
39         BUG_ON(IS_IA32_PROCESS(regs));
40
41         return regs->r10 == -1 ? regs->r8:0;
42 }
43
44 static inline long syscall_get_return_value(struct task_struct *task,
45                                             struct pt_regs *regs)
46 {
47         BUG_ON(IS_IA32_PROCESS(regs));
48
49         return regs->r8;
50 }
51
52 static inline void syscall_set_return_value(struct task_struct *task,
53                                             struct pt_regs *regs,
54                                             int error, long val)
55 {
56         BUG_ON(IS_IA32_PROCESS(regs));
57
58         if (error) {
59                 /* error < 0, but ia64 uses > 0 return value */
60                 regs->r8 = -error;
61                 regs->r10 = -1;
62         } else {
63                 regs->r8 = val;
64                 regs->r10 = 0;
65         }
66 }
67
68 extern void ia64_syscall_get_set_arguments(struct task_struct *task,
69         struct pt_regs *regs, unsigned int i, unsigned int n,
70         unsigned long *args, int rw);
71 static inline void syscall_get_arguments(struct task_struct *task,
72                                          struct pt_regs *regs,
73                                          unsigned int i, unsigned int n,
74                                          unsigned long *args)
75 {
76         BUG_ON(IS_IA32_PROCESS(regs));
77         BUG_ON(i + n > 6);
78
79         ia64_syscall_get_set_arguments(task, regs, i, n, args, 0);
80 }
81
82 static inline void syscall_set_arguments(struct task_struct *task,
83                                          struct pt_regs *regs,
84                                          unsigned int i, unsigned int n,
85                                          unsigned long *args)
86 {
87         BUG_ON(IS_IA32_PROCESS(regs));
88         BUG_ON(i + n > 6);
89
90         ia64_syscall_get_set_arguments(task, regs, i, n, args, 1);
91 }
92 #endif  /* _ASM_SYSCALL_H */