blob: 2f758a42f94bfaf086b9cc8361431c4ff9b683fe [file] [log] [blame]
Shaohua Licfb361f2008-09-18 15:49:14 +08001/*
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
19static inline long syscall_get_nr(struct task_struct *task,
20 struct pt_regs *regs)
21{
Shaohua Licfb361f2008-09-18 15:49:14 +080022 if ((long)regs->cr_ifs < 0) /* Not a syscall */
23 return -1;
Shaohua Li680973e2008-09-18 15:50:26 +080024
25#ifdef CONFIG_IA32_SUPPORT
26 if (IS_IA32_PROCESS(regs))
27 return regs->r1;
28#endif
29
Shaohua Licfb361f2008-09-18 15:49:14 +080030 return regs->r15;
31}
32
33static inline void syscall_rollback(struct task_struct *task,
34 struct pt_regs *regs)
35{
Shaohua Li680973e2008-09-18 15:50:26 +080036#ifdef CONFIG_IA32_SUPPORT
37 if (IS_IA32_PROCESS(regs))
38 regs->r8 = regs->r1;
39#endif
40
Shaohua Licfb361f2008-09-18 15:49:14 +080041 /* do nothing */
42}
43
44static inline long syscall_get_error(struct task_struct *task,
45 struct pt_regs *regs)
46{
Shaohua Li680973e2008-09-18 15:50:26 +080047#ifdef CONFIG_IA32_SUPPORT
48 if (IS_IA32_PROCESS(regs))
49 return regs->r8;
50#endif
Shaohua Licfb361f2008-09-18 15:49:14 +080051
52 return regs->r10 == -1 ? regs->r8:0;
53}
54
55static inline long syscall_get_return_value(struct task_struct *task,
56 struct pt_regs *regs)
57{
Shaohua Licfb361f2008-09-18 15:49:14 +080058 return regs->r8;
59}
60
61static inline void syscall_set_return_value(struct task_struct *task,
62 struct pt_regs *regs,
63 int error, long val)
64{
Shaohua Li680973e2008-09-18 15:50:26 +080065#ifdef CONFIG_IA32_SUPPORT
66 if (IS_IA32_PROCESS(regs)) {
67 regs->r8 = (long) error ? error : val;
68 return;
69 }
70#endif
Shaohua Licfb361f2008-09-18 15:49:14 +080071
72 if (error) {
73 /* error < 0, but ia64 uses > 0 return value */
74 regs->r8 = -error;
75 regs->r10 = -1;
76 } else {
77 regs->r8 = val;
78 regs->r10 = 0;
79 }
80}
81
82extern void ia64_syscall_get_set_arguments(struct task_struct *task,
83 struct pt_regs *regs, unsigned int i, unsigned int n,
84 unsigned long *args, int rw);
85static inline void syscall_get_arguments(struct task_struct *task,
86 struct pt_regs *regs,
87 unsigned int i, unsigned int n,
88 unsigned long *args)
89{
Shaohua Licfb361f2008-09-18 15:49:14 +080090 BUG_ON(i + n > 6);
91
Shaohua Li680973e2008-09-18 15:50:26 +080092#ifdef CONFIG_IA32_SUPPORT
93 if (IS_IA32_PROCESS(regs)) {
94 switch (i + n) {
95 case 6:
96 if (!n--) break;
97 *args++ = regs->r13;
98 case 5:
99 if (!n--) break;
100 *args++ = regs->r15;
101 case 4:
102 if (!n--) break;
103 *args++ = regs->r14;
104 case 3:
105 if (!n--) break;
106 *args++ = regs->r10;
107 case 2:
108 if (!n--) break;
109 *args++ = regs->r9;
110 case 1:
111 if (!n--) break;
112 *args++ = regs->r11;
113 case 0:
114 if (!n--) break;
115 default:
116 BUG();
117 break;
118 }
119
120 return;
121 }
122#endif
Shaohua Licfb361f2008-09-18 15:49:14 +0800123 ia64_syscall_get_set_arguments(task, regs, i, n, args, 0);
124}
125
126static inline void syscall_set_arguments(struct task_struct *task,
127 struct pt_regs *regs,
128 unsigned int i, unsigned int n,
129 unsigned long *args)
130{
Shaohua Licfb361f2008-09-18 15:49:14 +0800131 BUG_ON(i + n > 6);
132
Shaohua Li680973e2008-09-18 15:50:26 +0800133#ifdef CONFIG_IA32_SUPPORT
134 if (IS_IA32_PROCESS(regs)) {
135 switch (i + n) {
136 case 6:
137 if (!n--) break;
138 regs->r13 = *args++;
139 case 5:
140 if (!n--) break;
141 regs->r15 = *args++;
142 case 4:
143 if (!n--) break;
144 regs->r14 = *args++;
145 case 3:
146 if (!n--) break;
147 regs->r10 = *args++;
148 case 2:
149 if (!n--) break;
150 regs->r9 = *args++;
151 case 1:
152 if (!n--) break;
153 regs->r11 = *args++;
154 case 0:
155 if (!n--) break;
156 }
157
158 return;
159 }
160#endif
Shaohua Licfb361f2008-09-18 15:49:14 +0800161 ia64_syscall_get_set_arguments(task, regs, i, n, args, 1);
162}
163#endif /* _ASM_SYSCALL_H */