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 | |
579ec9e1 | 16 | #include <uapi/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 | |
f8781c4a | 23 | #ifdef CONFIG_X86_64 |
fa697140 DB |
24 | typedef asmlinkage long (*sys_call_ptr_t)(const struct pt_regs *); |
25 | #else | |
eb974c62 AL |
26 | typedef asmlinkage long (*sys_call_ptr_t)(unsigned long, unsigned long, |
27 | unsigned long, unsigned long, | |
28 | unsigned long, unsigned long); | |
f8781c4a | 29 | #endif /* CONFIG_X86_64 */ |
1599e8fc | 30 | extern const sys_call_ptr_t sys_call_table[]; |
e7b8e675 | 31 | |
034042cc AL |
32 | #if defined(CONFIG_X86_32) |
33 | #define ia32_sys_call_table sys_call_table | |
34 | #define __NR_syscall_compat_max __NR_syscall_max | |
35 | #define IA32_NR_syscalls NR_syscalls | |
36 | #endif | |
37 | ||
38 | #if defined(CONFIG_IA32_EMULATION) | |
39 | extern const sys_call_ptr_t ia32_sys_call_table[]; | |
40 | #endif | |
41 | ||
18c1e2c8 RM |
42 | /* |
43 | * Only the low 32 bits of orig_ax are meaningful, so we return int. | |
44 | * This importantly ignores the high bits on 64-bit, so comparisons | |
45 | * sign-extend the low 32 bits. | |
46 | */ | |
47 | static inline int syscall_get_nr(struct task_struct *task, struct pt_regs *regs) | |
68bd0f4e | 48 | { |
8b4b9f27 | 49 | return regs->orig_ax; |
68bd0f4e RM |
50 | } |
51 | ||
52 | static inline void syscall_rollback(struct task_struct *task, | |
53 | struct pt_regs *regs) | |
54 | { | |
8b4b9f27 | 55 | regs->ax = regs->orig_ax; |
68bd0f4e RM |
56 | } |
57 | ||
58 | static inline long syscall_get_error(struct task_struct *task, | |
59 | struct pt_regs *regs) | |
60 | { | |
61 | unsigned long error = regs->ax; | |
62 | #ifdef CONFIG_IA32_EMULATION | |
63 | /* | |
64 | * TS_COMPAT is set for 32-bit syscall entries and then | |
65 | * remains set until we return to user mode. | |
66 | */ | |
37a8f7c3 | 67 | if (task->thread_info.status & (TS_COMPAT|TS_I386_REGS_POKED)) |
68bd0f4e RM |
68 | /* |
69 | * Sign-extend the value so (int)-EFOO becomes (long)-EFOO | |
70 | * and will match correctly in comparisons. | |
71 | */ | |
72 | error = (long) (int) error; | |
73 | #endif | |
4ab4ba32 | 74 | return IS_ERR_VALUE(error) ? error : 0; |
68bd0f4e RM |
75 | } |
76 | ||
77 | static inline long syscall_get_return_value(struct task_struct *task, | |
78 | struct pt_regs *regs) | |
79 | { | |
80 | return regs->ax; | |
81 | } | |
82 | ||
83 | static inline void syscall_set_return_value(struct task_struct *task, | |
84 | struct pt_regs *regs, | |
85 | int error, long val) | |
86 | { | |
87 | regs->ax = (long) error ?: val; | |
88 | } | |
89 | ||
90 | #ifdef CONFIG_X86_32 | |
91 | ||
92 | static inline void syscall_get_arguments(struct task_struct *task, | |
93 | struct pt_regs *regs, | |
68bd0f4e RM |
94 | unsigned long *args) |
95 | { | |
b35f549d | 96 | memcpy(args, ®s->bx, 6 * sizeof(args[0])); |
68bd0f4e RM |
97 | } |
98 | ||
99 | static inline void syscall_set_arguments(struct task_struct *task, | |
100 | struct pt_regs *regs, | |
101 | unsigned int i, unsigned int n, | |
102 | const unsigned long *args) | |
103 | { | |
104 | BUG_ON(i + n > 6); | |
105 | memcpy(®s->bx + i, args, n * sizeof(args[0])); | |
106 | } | |
107 | ||
5e937a9a | 108 | static inline int syscall_get_arch(void) |
b7456536 WD |
109 | { |
110 | return AUDIT_ARCH_I386; | |
111 | } | |
112 | ||
68bd0f4e RM |
113 | #else /* CONFIG_X86_64 */ |
114 | ||
115 | static inline void syscall_get_arguments(struct task_struct *task, | |
116 | struct pt_regs *regs, | |
68bd0f4e RM |
117 | unsigned long *args) |
118 | { | |
119 | # ifdef CONFIG_IA32_EMULATION | |
b35f549d SRRH |
120 | if (task->thread_info.status & TS_COMPAT) { |
121 | *args++ = regs->bx; | |
122 | *args++ = regs->cx; | |
123 | *args++ = regs->dx; | |
124 | *args++ = regs->si; | |
125 | *args++ = regs->di; | |
126 | *args = regs->bp; | |
127 | } else | |
68bd0f4e | 128 | # endif |
b35f549d SRRH |
129 | { |
130 | *args++ = regs->di; | |
131 | *args++ = regs->si; | |
132 | *args++ = regs->dx; | |
133 | *args++ = regs->r10; | |
134 | *args++ = regs->r8; | |
135 | *args = regs->r9; | |
136 | } | |
68bd0f4e RM |
137 | } |
138 | ||
139 | static inline void syscall_set_arguments(struct task_struct *task, | |
140 | struct pt_regs *regs, | |
141 | unsigned int i, unsigned int n, | |
142 | const unsigned long *args) | |
143 | { | |
144 | # ifdef CONFIG_IA32_EMULATION | |
37a8f7c3 | 145 | if (task->thread_info.status & TS_COMPAT) |
746e7cef RM |
146 | switch (i) { |
147 | case 0: | |
68bd0f4e | 148 | if (!n--) break; |
746e7cef RM |
149 | regs->bx = *args++; |
150 | case 1: | |
68bd0f4e | 151 | if (!n--) break; |
746e7cef RM |
152 | regs->cx = *args++; |
153 | case 2: | |
68bd0f4e | 154 | if (!n--) break; |
746e7cef | 155 | regs->dx = *args++; |
68bd0f4e RM |
156 | case 3: |
157 | if (!n--) break; | |
746e7cef RM |
158 | regs->si = *args++; |
159 | case 4: | |
68bd0f4e | 160 | if (!n--) break; |
746e7cef RM |
161 | regs->di = *args++; |
162 | case 5: | |
68bd0f4e | 163 | if (!n--) break; |
746e7cef RM |
164 | regs->bp = *args++; |
165 | case 6: | |
68bd0f4e RM |
166 | if (!n--) break; |
167 | default: | |
168 | BUG(); | |
746e7cef | 169 | break; |
68bd0f4e RM |
170 | } |
171 | else | |
172 | # endif | |
746e7cef RM |
173 | switch (i) { |
174 | case 0: | |
68bd0f4e | 175 | if (!n--) break; |
746e7cef RM |
176 | regs->di = *args++; |
177 | case 1: | |
68bd0f4e | 178 | if (!n--) break; |
746e7cef RM |
179 | regs->si = *args++; |
180 | case 2: | |
68bd0f4e | 181 | if (!n--) break; |
746e7cef | 182 | regs->dx = *args++; |
68bd0f4e RM |
183 | case 3: |
184 | if (!n--) break; | |
746e7cef RM |
185 | regs->r10 = *args++; |
186 | case 4: | |
68bd0f4e | 187 | if (!n--) break; |
746e7cef RM |
188 | regs->r8 = *args++; |
189 | case 5: | |
68bd0f4e | 190 | if (!n--) break; |
746e7cef RM |
191 | regs->r9 = *args++; |
192 | case 6: | |
68bd0f4e RM |
193 | if (!n--) break; |
194 | default: | |
195 | BUG(); | |
746e7cef | 196 | break; |
68bd0f4e RM |
197 | } |
198 | } | |
199 | ||
5e937a9a | 200 | static inline int syscall_get_arch(void) |
b7456536 | 201 | { |
b9d989c7 AL |
202 | /* x32 tasks should be considered AUDIT_ARCH_X86_64. */ |
203 | return in_ia32_syscall() ? AUDIT_ARCH_I386 : AUDIT_ARCH_X86_64; | |
b7456536 | 204 | } |
68bd0f4e RM |
205 | #endif /* CONFIG_X86_32 */ |
206 | ||
5e1b0075 | 207 | #endif /* _ASM_X86_SYSCALL_H */ |