Commit | Line | Data |
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68bd0f4e RM |
1 | /* |
2 | * Access to user system call parameters and results | |
3 | * | |
18c1e2c8 | 4 | * Copyright (C) 2008-2009 Red Hat, Inc. All rights reserved. |
68bd0f4e RM |
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 | ||
5e1b0075 PA |
13 | #ifndef _ASM_X86_SYSCALL_H |
14 | #define _ASM_X86_SYSCALL_H | |
68bd0f4e | 15 | |
b7456536 | 16 | #include <linux/audit.h> |
68bd0f4e | 17 | #include <linux/sched.h> |
4ab4ba32 | 18 | #include <linux/err.h> |
72142fd4 | 19 | #include <asm/asm-offsets.h> /* For NR_syscalls */ |
b7456536 | 20 | #include <asm/thread_info.h> /* for TS_COMPAT */ |
fca460f9 | 21 | #include <asm/unistd.h> |
68bd0f4e | 22 | |
1599e8fc AK |
23 | typedef void (*sys_call_ptr_t)(void); |
24 | extern const sys_call_ptr_t sys_call_table[]; | |
e7b8e675 | 25 | |
18c1e2c8 RM |
26 | /* |
27 | * Only the low 32 bits of orig_ax are meaningful, so we return int. | |
28 | * This importantly ignores the high bits on 64-bit, so comparisons | |
29 | * sign-extend the low 32 bits. | |
30 | */ | |
31 | static inline int syscall_get_nr(struct task_struct *task, struct pt_regs *regs) | |
68bd0f4e | 32 | { |
8b4b9f27 | 33 | return regs->orig_ax; |
68bd0f4e RM |
34 | } |
35 | ||
36 | static inline void syscall_rollback(struct task_struct *task, | |
37 | struct pt_regs *regs) | |
38 | { | |
8b4b9f27 | 39 | regs->ax = regs->orig_ax; |
68bd0f4e RM |
40 | } |
41 | ||
42 | static inline long syscall_get_error(struct task_struct *task, | |
43 | struct pt_regs *regs) | |
44 | { | |
45 | unsigned long error = regs->ax; | |
46 | #ifdef CONFIG_IA32_EMULATION | |
47 | /* | |
48 | * TS_COMPAT is set for 32-bit syscall entries and then | |
49 | * remains set until we return to user mode. | |
50 | */ | |
51 | if (task_thread_info(task)->status & TS_COMPAT) | |
52 | /* | |
53 | * Sign-extend the value so (int)-EFOO becomes (long)-EFOO | |
54 | * and will match correctly in comparisons. | |
55 | */ | |
56 | error = (long) (int) error; | |
57 | #endif | |
4ab4ba32 | 58 | return IS_ERR_VALUE(error) ? error : 0; |
68bd0f4e RM |
59 | } |
60 | ||
61 | static inline long syscall_get_return_value(struct task_struct *task, | |
62 | struct pt_regs *regs) | |
63 | { | |
64 | return regs->ax; | |
65 | } | |
66 | ||
67 | static inline void syscall_set_return_value(struct task_struct *task, | |
68 | struct pt_regs *regs, | |
69 | int error, long val) | |
70 | { | |
71 | regs->ax = (long) error ?: val; | |
72 | } | |
73 | ||
74 | #ifdef CONFIG_X86_32 | |
75 | ||
76 | static inline void syscall_get_arguments(struct task_struct *task, | |
77 | struct pt_regs *regs, | |
78 | unsigned int i, unsigned int n, | |
79 | unsigned long *args) | |
80 | { | |
81 | BUG_ON(i + n > 6); | |
82 | memcpy(args, ®s->bx + i, n * sizeof(args[0])); | |
83 | } | |
84 | ||
85 | static inline void syscall_set_arguments(struct task_struct *task, | |
86 | struct pt_regs *regs, | |
87 | unsigned int i, unsigned int n, | |
88 | const unsigned long *args) | |
89 | { | |
90 | BUG_ON(i + n > 6); | |
91 | memcpy(®s->bx + i, args, n * sizeof(args[0])); | |
92 | } | |
93 | ||
b7456536 WD |
94 | static inline int syscall_get_arch(struct task_struct *task, |
95 | struct pt_regs *regs) | |
96 | { | |
97 | return AUDIT_ARCH_I386; | |
98 | } | |
99 | ||
68bd0f4e RM |
100 | #else /* CONFIG_X86_64 */ |
101 | ||
102 | static inline void syscall_get_arguments(struct task_struct *task, | |
103 | struct pt_regs *regs, | |
104 | unsigned int i, unsigned int n, | |
105 | unsigned long *args) | |
106 | { | |
107 | # ifdef CONFIG_IA32_EMULATION | |
108 | if (task_thread_info(task)->status & TS_COMPAT) | |
746e7cef RM |
109 | switch (i) { |
110 | case 0: | |
68bd0f4e | 111 | if (!n--) break; |
746e7cef RM |
112 | *args++ = regs->bx; |
113 | case 1: | |
68bd0f4e | 114 | if (!n--) break; |
746e7cef RM |
115 | *args++ = regs->cx; |
116 | case 2: | |
68bd0f4e | 117 | if (!n--) break; |
746e7cef | 118 | *args++ = regs->dx; |
68bd0f4e RM |
119 | case 3: |
120 | if (!n--) break; | |
746e7cef RM |
121 | *args++ = regs->si; |
122 | case 4: | |
68bd0f4e | 123 | if (!n--) break; |
746e7cef RM |
124 | *args++ = regs->di; |
125 | case 5: | |
68bd0f4e | 126 | if (!n--) break; |
746e7cef RM |
127 | *args++ = regs->bp; |
128 | case 6: | |
68bd0f4e RM |
129 | if (!n--) break; |
130 | default: | |
131 | BUG(); | |
132 | break; | |
133 | } | |
134 | else | |
135 | # endif | |
746e7cef RM |
136 | switch (i) { |
137 | case 0: | |
68bd0f4e | 138 | if (!n--) break; |
746e7cef RM |
139 | *args++ = regs->di; |
140 | case 1: | |
68bd0f4e | 141 | if (!n--) break; |
746e7cef RM |
142 | *args++ = regs->si; |
143 | case 2: | |
68bd0f4e | 144 | if (!n--) break; |
746e7cef | 145 | *args++ = regs->dx; |
68bd0f4e RM |
146 | case 3: |
147 | if (!n--) break; | |
746e7cef RM |
148 | *args++ = regs->r10; |
149 | case 4: | |
68bd0f4e | 150 | if (!n--) break; |
746e7cef RM |
151 | *args++ = regs->r8; |
152 | case 5: | |
68bd0f4e | 153 | if (!n--) break; |
746e7cef RM |
154 | *args++ = regs->r9; |
155 | case 6: | |
68bd0f4e RM |
156 | if (!n--) break; |
157 | default: | |
158 | BUG(); | |
159 | break; | |
160 | } | |
161 | } | |
162 | ||
163 | static inline void syscall_set_arguments(struct task_struct *task, | |
164 | struct pt_regs *regs, | |
165 | unsigned int i, unsigned int n, | |
166 | const unsigned long *args) | |
167 | { | |
168 | # ifdef CONFIG_IA32_EMULATION | |
169 | if (task_thread_info(task)->status & TS_COMPAT) | |
746e7cef RM |
170 | switch (i) { |
171 | case 0: | |
68bd0f4e | 172 | if (!n--) break; |
746e7cef RM |
173 | regs->bx = *args++; |
174 | case 1: | |
68bd0f4e | 175 | if (!n--) break; |
746e7cef RM |
176 | regs->cx = *args++; |
177 | case 2: | |
68bd0f4e | 178 | if (!n--) break; |
746e7cef | 179 | regs->dx = *args++; |
68bd0f4e RM |
180 | case 3: |
181 | if (!n--) break; | |
746e7cef RM |
182 | regs->si = *args++; |
183 | case 4: | |
68bd0f4e | 184 | if (!n--) break; |
746e7cef RM |
185 | regs->di = *args++; |
186 | case 5: | |
68bd0f4e | 187 | if (!n--) break; |
746e7cef RM |
188 | regs->bp = *args++; |
189 | case 6: | |
68bd0f4e RM |
190 | if (!n--) break; |
191 | default: | |
192 | BUG(); | |
746e7cef | 193 | break; |
68bd0f4e RM |
194 | } |
195 | else | |
196 | # endif | |
746e7cef RM |
197 | switch (i) { |
198 | case 0: | |
68bd0f4e | 199 | if (!n--) break; |
746e7cef RM |
200 | regs->di = *args++; |
201 | case 1: | |
68bd0f4e | 202 | if (!n--) break; |
746e7cef RM |
203 | regs->si = *args++; |
204 | case 2: | |
68bd0f4e | 205 | if (!n--) break; |
746e7cef | 206 | regs->dx = *args++; |
68bd0f4e RM |
207 | case 3: |
208 | if (!n--) break; | |
746e7cef RM |
209 | regs->r10 = *args++; |
210 | case 4: | |
68bd0f4e | 211 | if (!n--) break; |
746e7cef RM |
212 | regs->r8 = *args++; |
213 | case 5: | |
68bd0f4e | 214 | if (!n--) break; |
746e7cef RM |
215 | regs->r9 = *args++; |
216 | case 6: | |
68bd0f4e RM |
217 | if (!n--) break; |
218 | default: | |
219 | BUG(); | |
746e7cef | 220 | break; |
68bd0f4e RM |
221 | } |
222 | } | |
223 | ||
b7456536 WD |
224 | static inline int syscall_get_arch(struct task_struct *task, |
225 | struct pt_regs *regs) | |
226 | { | |
227 | #ifdef CONFIG_IA32_EMULATION | |
228 | /* | |
229 | * TS_COMPAT is set for 32-bit syscall entry and then | |
230 | * remains set until we return to user mode. | |
231 | * | |
232 | * TIF_IA32 tasks should always have TS_COMPAT set at | |
233 | * system call time. | |
234 | * | |
235 | * x32 tasks should be considered AUDIT_ARCH_X86_64. | |
236 | */ | |
237 | if (task_thread_info(task)->status & TS_COMPAT) | |
238 | return AUDIT_ARCH_I386; | |
239 | #endif | |
240 | /* Both x32 and x86_64 are considered "64-bit". */ | |
241 | return AUDIT_ARCH_X86_64; | |
242 | } | |
68bd0f4e RM |
243 | #endif /* CONFIG_X86_32 */ |
244 | ||
5e1b0075 | 245 | #endif /* _ASM_X86_SYSCALL_H */ |