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1/* SPDX-License-Identifier: GPL-2.0-only */
2/*
3 * Access to user system call parameters and results
4 *
5 * Copyright (C) 2008-2009 Red Hat, Inc. All rights reserved.
6 *
7 * See asm-generic/syscall.h for descriptions of what we must do here.
8 */
9
10#ifndef _ASM_X86_SYSCALL_H
11#define _ASM_X86_SYSCALL_H
12
13#include <uapi/linux/audit.h>
14#include <linux/sched.h>
15#include <linux/err.h>
16#include <asm/thread_info.h> /* for TS_COMPAT */
17#include <asm/unistd.h>
18
19typedef long (*sys_call_ptr_t)(const struct pt_regs *);
20extern const sys_call_ptr_t sys_call_table[];
21
22#if defined(CONFIG_X86_32)
23#define ia32_sys_call_table sys_call_table
24#else
25/*
26 * These may not exist, but still put the prototypes in so we
27 * can use IS_ENABLED().
28 */
29extern const sys_call_ptr_t ia32_sys_call_table[];
30extern const sys_call_ptr_t x32_sys_call_table[];
31#endif
32
33/*
34 * Only the low 32 bits of orig_ax are meaningful, so we return int.
35 * This importantly ignores the high bits on 64-bit, so comparisons
36 * sign-extend the low 32 bits.
37 */
38static inline int syscall_get_nr(struct task_struct *task, struct pt_regs *regs)
39{
40 return regs->orig_ax;
41}
42
43static inline void syscall_rollback(struct task_struct *task,
44 struct pt_regs *regs)
45{
46 regs->ax = regs->orig_ax;
47}
48
49static inline long syscall_get_error(struct task_struct *task,
50 struct pt_regs *regs)
51{
52 unsigned long error = regs->ax;
53#ifdef CONFIG_IA32_EMULATION
54 /*
55 * TS_COMPAT is set for 32-bit syscall entries and then
56 * remains set until we return to user mode.
57 */
58 if (task->thread_info.status & (TS_COMPAT|TS_I386_REGS_POKED))
59 /*
60 * Sign-extend the value so (int)-EFOO becomes (long)-EFOO
61 * and will match correctly in comparisons.
62 */
63 error = (long) (int) error;
64#endif
65 return IS_ERR_VALUE(error) ? error : 0;
66}
67
68static inline long syscall_get_return_value(struct task_struct *task,
69 struct pt_regs *regs)
70{
71 return regs->ax;
72}
73
74static inline void syscall_set_return_value(struct task_struct *task,
75 struct pt_regs *regs,
76 int error, long val)
77{
78 regs->ax = (long) error ?: val;
79}
80
81#ifdef CONFIG_X86_32
82
83static inline void syscall_get_arguments(struct task_struct *task,
84 struct pt_regs *regs,
85 unsigned long *args)
86{
87 memcpy(args, ®s->bx, 6 * sizeof(args[0]));
88}
89
90static inline int syscall_get_arch(struct task_struct *task)
91{
92 return AUDIT_ARCH_I386;
93}
94
95#else /* CONFIG_X86_64 */
96
97static inline void syscall_get_arguments(struct task_struct *task,
98 struct pt_regs *regs,
99 unsigned long *args)
100{
101# ifdef CONFIG_IA32_EMULATION
102 if (task->thread_info.status & TS_COMPAT) {
103 *args++ = regs->bx;
104 *args++ = regs->cx;
105 *args++ = regs->dx;
106 *args++ = regs->si;
107 *args++ = regs->di;
108 *args = regs->bp;
109 } else
110# endif
111 {
112 *args++ = regs->di;
113 *args++ = regs->si;
114 *args++ = regs->dx;
115 *args++ = regs->r10;
116 *args++ = regs->r8;
117 *args = regs->r9;
118 }
119}
120
121static inline int syscall_get_arch(struct task_struct *task)
122{
123 /* x32 tasks should be considered AUDIT_ARCH_X86_64. */
124 return (IS_ENABLED(CONFIG_IA32_EMULATION) &&
125 task->thread_info.status & TS_COMPAT)
126 ? AUDIT_ARCH_I386 : AUDIT_ARCH_X86_64;
127}
128
129void do_syscall_64(struct pt_regs *regs, int nr);
130void do_int80_syscall_32(struct pt_regs *regs);
131long do_fast_syscall_32(struct pt_regs *regs);
132
133#endif /* CONFIG_X86_32 */
134
135#endif /* _ASM_X86_SYSCALL_H */
1/*
2 * Access to user system call parameters and results
3 *
4 * Copyright (C) 2008-2009 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_X86_SYSCALL_H
14#define _ASM_X86_SYSCALL_H
15
16#include <uapi/linux/audit.h>
17#include <linux/sched.h>
18#include <linux/err.h>
19#include <asm/asm-offsets.h> /* For NR_syscalls */
20#include <asm/thread_info.h> /* for TS_COMPAT */
21#include <asm/unistd.h>
22
23typedef void (*sys_call_ptr_t)(void);
24extern const sys_call_ptr_t sys_call_table[];
25
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 */
31static inline int syscall_get_nr(struct task_struct *task, struct pt_regs *regs)
32{
33 return regs->orig_ax;
34}
35
36static inline void syscall_rollback(struct task_struct *task,
37 struct pt_regs *regs)
38{
39 regs->ax = regs->orig_ax;
40}
41
42static 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
58 return IS_ERR_VALUE(error) ? error : 0;
59}
60
61static inline long syscall_get_return_value(struct task_struct *task,
62 struct pt_regs *regs)
63{
64 return regs->ax;
65}
66
67static 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
76static 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
85static 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
94static inline int syscall_get_arch(void)
95{
96 return AUDIT_ARCH_I386;
97}
98
99#else /* CONFIG_X86_64 */
100
101static inline void syscall_get_arguments(struct task_struct *task,
102 struct pt_regs *regs,
103 unsigned int i, unsigned int n,
104 unsigned long *args)
105{
106# ifdef CONFIG_IA32_EMULATION
107 if (task_thread_info(task)->status & TS_COMPAT)
108 switch (i) {
109 case 0:
110 if (!n--) break;
111 *args++ = regs->bx;
112 case 1:
113 if (!n--) break;
114 *args++ = regs->cx;
115 case 2:
116 if (!n--) break;
117 *args++ = regs->dx;
118 case 3:
119 if (!n--) break;
120 *args++ = regs->si;
121 case 4:
122 if (!n--) break;
123 *args++ = regs->di;
124 case 5:
125 if (!n--) break;
126 *args++ = regs->bp;
127 case 6:
128 if (!n--) break;
129 default:
130 BUG();
131 break;
132 }
133 else
134# endif
135 switch (i) {
136 case 0:
137 if (!n--) break;
138 *args++ = regs->di;
139 case 1:
140 if (!n--) break;
141 *args++ = regs->si;
142 case 2:
143 if (!n--) break;
144 *args++ = regs->dx;
145 case 3:
146 if (!n--) break;
147 *args++ = regs->r10;
148 case 4:
149 if (!n--) break;
150 *args++ = regs->r8;
151 case 5:
152 if (!n--) break;
153 *args++ = regs->r9;
154 case 6:
155 if (!n--) break;
156 default:
157 BUG();
158 break;
159 }
160}
161
162static inline void syscall_set_arguments(struct task_struct *task,
163 struct pt_regs *regs,
164 unsigned int i, unsigned int n,
165 const unsigned long *args)
166{
167# ifdef CONFIG_IA32_EMULATION
168 if (task_thread_info(task)->status & TS_COMPAT)
169 switch (i) {
170 case 0:
171 if (!n--) break;
172 regs->bx = *args++;
173 case 1:
174 if (!n--) break;
175 regs->cx = *args++;
176 case 2:
177 if (!n--) break;
178 regs->dx = *args++;
179 case 3:
180 if (!n--) break;
181 regs->si = *args++;
182 case 4:
183 if (!n--) break;
184 regs->di = *args++;
185 case 5:
186 if (!n--) break;
187 regs->bp = *args++;
188 case 6:
189 if (!n--) break;
190 default:
191 BUG();
192 break;
193 }
194 else
195# endif
196 switch (i) {
197 case 0:
198 if (!n--) break;
199 regs->di = *args++;
200 case 1:
201 if (!n--) break;
202 regs->si = *args++;
203 case 2:
204 if (!n--) break;
205 regs->dx = *args++;
206 case 3:
207 if (!n--) break;
208 regs->r10 = *args++;
209 case 4:
210 if (!n--) break;
211 regs->r8 = *args++;
212 case 5:
213 if (!n--) break;
214 regs->r9 = *args++;
215 case 6:
216 if (!n--) break;
217 default:
218 BUG();
219 break;
220 }
221}
222
223static inline int syscall_get_arch(void)
224{
225#ifdef CONFIG_IA32_EMULATION
226 /*
227 * TS_COMPAT is set for 32-bit syscall entry and then
228 * remains set until we return to user mode.
229 *
230 * TIF_IA32 tasks should always have TS_COMPAT set at
231 * system call time.
232 *
233 * x32 tasks should be considered AUDIT_ARCH_X86_64.
234 */
235 if (task_thread_info(current)->status & TS_COMPAT)
236 return AUDIT_ARCH_I386;
237#endif
238 /* Both x32 and x86_64 are considered "64-bit". */
239 return AUDIT_ARCH_X86_64;
240}
241#endif /* CONFIG_X86_32 */
242
243#endif /* _ASM_X86_SYSCALL_H */