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[deliverable/linux.git] / arch / x86 / include / asm / syscall.h
CommitLineData
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
RM		 15
16#include <linux/sched.h>
4ab4ba32 17#include <linux/err.h>
68bd0f4e 18
e7b8e675
MF		 19extern const unsigned long sys_call_table[];
20
18c1e2c8
RM		 21/*
22 * Only the low 32 bits of orig_ax are meaningful, so we return int.
23 * This importantly ignores the high bits on 64-bit, so comparisons
24 * sign-extend the low 32 bits.
25 */
26static inline int syscall_get_nr(struct task_struct *task, struct pt_regs *regs)
68bd0f4e 27{
68bd0f4e
RM		 28 return regs->orig_ax;
29}
30
31static inline void syscall_rollback(struct task_struct *task,
32 struct pt_regs *regs)
33{
34 regs->ax = regs->orig_ax;
35}
36
37static inline long syscall_get_error(struct task_struct *task,
38 struct pt_regs *regs)
39{
40 unsigned long error = regs->ax;
41#ifdef CONFIG_IA32_EMULATION
42 /*
43 * TS_COMPAT is set for 32-bit syscall entries and then
44 * remains set until we return to user mode.
45 */
46 if (task_thread_info(task)->status & TS_COMPAT)
47 /*
48 * Sign-extend the value so (int)-EFOO becomes (long)-EFOO
49 * and will match correctly in comparisons.
50 */
51 error = (long) (int) error;
52#endif
4ab4ba32 53 return IS_ERR_VALUE(error) ? error : 0;
68bd0f4e
RM		 54}
55
56static inline long syscall_get_return_value(struct task_struct *task,
57 struct pt_regs *regs)
58{
59 return regs->ax;
60}
61
62static inline void syscall_set_return_value(struct task_struct *task,
63 struct pt_regs *regs,
64 int error, long val)
65{
66 regs->ax = (long) error ?: val;
67}
68
69#ifdef CONFIG_X86_32
70
71static 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(i + n > 6);
77 memcpy(args, &regs->bx + i, n * sizeof(args[0]));
78}
79
80static inline void syscall_set_arguments(struct task_struct *task,
81 struct pt_regs *regs,
82 unsigned int i, unsigned int n,
83 const unsigned long *args)
84{
85 BUG_ON(i + n > 6);
86 memcpy(&regs->bx + i, args, n * sizeof(args[0]));
87}
88
89#else /* CONFIG_X86_64 */
90
91static inline void syscall_get_arguments(struct task_struct *task,
92 struct pt_regs *regs,
93 unsigned int i, unsigned int n,
94 unsigned long *args)
95{
96# ifdef CONFIG_IA32_EMULATION
97 if (task_thread_info(task)->status & TS_COMPAT)
746e7cef
RM		 98 switch (i) {
99 case 0:
68bd0f4e 100 if (!n--) break;
746e7cef
RM		 101 *args++ = regs->bx;
102 case 1:
68bd0f4e 103 if (!n--) break;
746e7cef
RM		 104 *args++ = regs->cx;
105 case 2:
68bd0f4e 106 if (!n--) break;
746e7cef 107 *args++ = regs->dx;
68bd0f4e
RM		 108 case 3:
109 if (!n--) break;
746e7cef
RM		 110 *args++ = regs->si;
111 case 4:
68bd0f4e 112 if (!n--) break;
746e7cef
RM		 113 *args++ = regs->di;
114 case 5:
68bd0f4e 115 if (!n--) break;
746e7cef
RM		 116 *args++ = regs->bp;
117 case 6:
68bd0f4e
RM		 118 if (!n--) break;
119 default:
120 BUG();
121 break;
122 }
123 else
124# endif
746e7cef
RM		 125 switch (i) {
126 case 0:
68bd0f4e 127 if (!n--) break;
746e7cef
RM		 128 *args++ = regs->di;
129 case 1:
68bd0f4e 130 if (!n--) break;
746e7cef
RM		 131 *args++ = regs->si;
132 case 2:
68bd0f4e 133 if (!n--) break;
746e7cef 134 *args++ = regs->dx;
68bd0f4e
RM		 135 case 3:
136 if (!n--) break;
746e7cef
RM		 137 *args++ = regs->r10;
138 case 4:
68bd0f4e 139 if (!n--) break;
746e7cef
RM		 140 *args++ = regs->r8;
141 case 5:
68bd0f4e 142 if (!n--) break;
746e7cef
RM		 143 *args++ = regs->r9;
144 case 6:
68bd0f4e
RM		 145 if (!n--) break;
146 default:
147 BUG();
148 break;
149 }
150}
151
152static inline void syscall_set_arguments(struct task_struct *task,
153 struct pt_regs *regs,
154 unsigned int i, unsigned int n,
155 const unsigned long *args)
156{
157# ifdef CONFIG_IA32_EMULATION
158 if (task_thread_info(task)->status & TS_COMPAT)
746e7cef
RM		 159 switch (i) {
160 case 0:
68bd0f4e 161 if (!n--) break;
746e7cef
RM		 162 regs->bx = *args++;
163 case 1:
68bd0f4e 164 if (!n--) break;
746e7cef
RM		 165 regs->cx = *args++;
166 case 2:
68bd0f4e 167 if (!n--) break;
746e7cef 168 regs->dx = *args++;
68bd0f4e
RM		 169 case 3:
170 if (!n--) break;
746e7cef
RM		 171 regs->si = *args++;
172 case 4:
68bd0f4e 173 if (!n--) break;
746e7cef
RM		 174 regs->di = *args++;
175 case 5:
68bd0f4e 176 if (!n--) break;
746e7cef
RM		 177 regs->bp = *args++;
178 case 6:
68bd0f4e
RM		 179 if (!n--) break;
180 default:
181 BUG();
746e7cef 182 break;
68bd0f4e
RM		 183 }
184 else
185# endif
746e7cef
RM		 186 switch (i) {
187 case 0:
68bd0f4e 188 if (!n--) break;
746e7cef
RM		 189 regs->di = *args++;
190 case 1:
68bd0f4e 191 if (!n--) break;
746e7cef
RM		 192 regs->si = *args++;
193 case 2:
68bd0f4e 194 if (!n--) break;
746e7cef 195 regs->dx = *args++;
68bd0f4e
RM		 196 case 3:
197 if (!n--) break;
746e7cef
RM		 198 regs->r10 = *args++;
199 case 4:
68bd0f4e 200 if (!n--) break;
746e7cef
RM		 201 regs->r8 = *args++;
202 case 5:
68bd0f4e 203 if (!n--) break;
746e7cef
RM		 204 regs->r9 = *args++;
205 case 6:
68bd0f4e
RM		 206 if (!n--) break;
207 default:
208 BUG();
746e7cef 209 break;
68bd0f4e
RM		 210 }
211}
212
213#endif /* CONFIG_X86_32 */
214
5e1b0075 215#endif /* _ASM_X86_SYSCALL_H */
Linux kernel - Deliverables
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