Commit | Line | Data |
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68bd0f4e RM |
1 | /* |
2 | * Access to user system call parameters and results | |
3 | * | |
4 | * Copyright (C) 2008 Red Hat, Inc. All rights reserved. | |
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> | |
4ab4ba32 | 17 | #include <linux/err.h> |
68bd0f4e RM |
18 | |
19 | static inline long syscall_get_nr(struct task_struct *task, | |
20 | struct pt_regs *regs) | |
21 | { | |
22 | /* | |
23 | * We always sign-extend a -1 value being set here, | |
24 | * so this is always either -1L or a syscall number. | |
25 | */ | |
26 | return regs->orig_ax; | |
27 | } | |
28 | ||
29 | static inline void syscall_rollback(struct task_struct *task, | |
30 | struct pt_regs *regs) | |
31 | { | |
32 | regs->ax = regs->orig_ax; | |
33 | } | |
34 | ||
35 | static inline long syscall_get_error(struct task_struct *task, | |
36 | struct pt_regs *regs) | |
37 | { | |
38 | unsigned long error = regs->ax; | |
39 | #ifdef CONFIG_IA32_EMULATION | |
40 | /* | |
41 | * TS_COMPAT is set for 32-bit syscall entries and then | |
42 | * remains set until we return to user mode. | |
43 | */ | |
44 | if (task_thread_info(task)->status & TS_COMPAT) | |
45 | /* | |
46 | * Sign-extend the value so (int)-EFOO becomes (long)-EFOO | |
47 | * and will match correctly in comparisons. | |
48 | */ | |
49 | error = (long) (int) error; | |
50 | #endif | |
4ab4ba32 | 51 | return IS_ERR_VALUE(error) ? error : 0; |
68bd0f4e RM |
52 | } |
53 | ||
54 | static inline long syscall_get_return_value(struct task_struct *task, | |
55 | struct pt_regs *regs) | |
56 | { | |
57 | return regs->ax; | |
58 | } | |
59 | ||
60 | static inline void syscall_set_return_value(struct task_struct *task, | |
61 | struct pt_regs *regs, | |
62 | int error, long val) | |
63 | { | |
64 | regs->ax = (long) error ?: val; | |
65 | } | |
66 | ||
67 | #ifdef CONFIG_X86_32 | |
68 | ||
69 | static inline void syscall_get_arguments(struct task_struct *task, | |
70 | struct pt_regs *regs, | |
71 | unsigned int i, unsigned int n, | |
72 | unsigned long *args) | |
73 | { | |
74 | BUG_ON(i + n > 6); | |
75 | memcpy(args, ®s->bx + i, n * sizeof(args[0])); | |
76 | } | |
77 | ||
78 | static inline void syscall_set_arguments(struct task_struct *task, | |
79 | struct pt_regs *regs, | |
80 | unsigned int i, unsigned int n, | |
81 | const unsigned long *args) | |
82 | { | |
83 | BUG_ON(i + n > 6); | |
84 | memcpy(®s->bx + i, args, n * sizeof(args[0])); | |
85 | } | |
86 | ||
87 | #else /* CONFIG_X86_64 */ | |
88 | ||
89 | static inline void syscall_get_arguments(struct task_struct *task, | |
90 | struct pt_regs *regs, | |
91 | unsigned int i, unsigned int n, | |
92 | unsigned long *args) | |
93 | { | |
94 | # ifdef CONFIG_IA32_EMULATION | |
95 | if (task_thread_info(task)->status & TS_COMPAT) | |
96 | switch (i + n) { | |
97 | case 6: | |
98 | if (!n--) break; | |
99 | *args++ = regs->bp; | |
100 | case 5: | |
101 | if (!n--) break; | |
102 | *args++ = regs->di; | |
103 | case 4: | |
104 | if (!n--) break; | |
105 | *args++ = regs->si; | |
106 | case 3: | |
107 | if (!n--) break; | |
108 | *args++ = regs->dx; | |
109 | case 2: | |
110 | if (!n--) break; | |
111 | *args++ = regs->cx; | |
112 | case 1: | |
113 | if (!n--) break; | |
114 | *args++ = regs->bx; | |
115 | case 0: | |
116 | if (!n--) break; | |
117 | default: | |
118 | BUG(); | |
119 | break; | |
120 | } | |
121 | else | |
122 | # endif | |
123 | switch (i + n) { | |
124 | case 6: | |
125 | if (!n--) break; | |
126 | *args++ = regs->r9; | |
127 | case 5: | |
128 | if (!n--) break; | |
129 | *args++ = regs->r8; | |
130 | case 4: | |
131 | if (!n--) break; | |
132 | *args++ = regs->r10; | |
133 | case 3: | |
134 | if (!n--) break; | |
135 | *args++ = regs->dx; | |
136 | case 2: | |
137 | if (!n--) break; | |
138 | *args++ = regs->si; | |
139 | case 1: | |
140 | if (!n--) break; | |
141 | *args++ = regs->di; | |
142 | case 0: | |
143 | if (!n--) break; | |
144 | default: | |
145 | BUG(); | |
146 | break; | |
147 | } | |
148 | } | |
149 | ||
150 | static inline void syscall_set_arguments(struct task_struct *task, | |
151 | struct pt_regs *regs, | |
152 | unsigned int i, unsigned int n, | |
153 | const unsigned long *args) | |
154 | { | |
155 | # ifdef CONFIG_IA32_EMULATION | |
156 | if (task_thread_info(task)->status & TS_COMPAT) | |
157 | switch (i + n) { | |
158 | case 6: | |
159 | if (!n--) break; | |
160 | regs->bp = *args++; | |
161 | case 5: | |
162 | if (!n--) break; | |
163 | regs->di = *args++; | |
164 | case 4: | |
165 | if (!n--) break; | |
166 | regs->si = *args++; | |
167 | case 3: | |
168 | if (!n--) break; | |
169 | regs->dx = *args++; | |
170 | case 2: | |
171 | if (!n--) break; | |
172 | regs->cx = *args++; | |
173 | case 1: | |
174 | if (!n--) break; | |
175 | regs->bx = *args++; | |
176 | case 0: | |
177 | if (!n--) break; | |
178 | default: | |
179 | BUG(); | |
180 | } | |
181 | else | |
182 | # endif | |
183 | switch (i + n) { | |
184 | case 6: | |
185 | if (!n--) break; | |
186 | regs->r9 = *args++; | |
187 | case 5: | |
188 | if (!n--) break; | |
189 | regs->r8 = *args++; | |
190 | case 4: | |
191 | if (!n--) break; | |
192 | regs->r10 = *args++; | |
193 | case 3: | |
194 | if (!n--) break; | |
195 | regs->dx = *args++; | |
196 | case 2: | |
197 | if (!n--) break; | |
198 | regs->si = *args++; | |
199 | case 1: | |
200 | if (!n--) break; | |
201 | regs->di = *args++; | |
202 | case 0: | |
203 | if (!n--) break; | |
204 | default: | |
205 | BUG(); | |
206 | } | |
207 | } | |
208 | ||
209 | #endif /* CONFIG_X86_32 */ | |
210 | ||
211 | #endif /* _ASM_SYSCALL_H */ |