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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 asmlinkage long (*sys_call_ptr_t)(unsigned long, unsigned long,
24 unsigned long, unsigned long,
25 unsigned long, unsigned long);
26extern const sys_call_ptr_t sys_call_table[];
27
28#if defined(CONFIG_X86_32)
29#define ia32_sys_call_table sys_call_table
30#define __NR_syscall_compat_max __NR_syscall_max
31#define IA32_NR_syscalls NR_syscalls
32#endif
33
34#if defined(CONFIG_IA32_EMULATION)
35extern const sys_call_ptr_t ia32_sys_call_table[];
36#endif
37
38/*
39 * Only the low 32 bits of orig_ax are meaningful, so we return int.
40 * This importantly ignores the high bits on 64-bit, so comparisons
41 * sign-extend the low 32 bits.
42 */
43static inline int syscall_get_nr(struct task_struct *task, struct pt_regs *regs)
44{
45 return regs->orig_ax;
46}
47
48static inline void syscall_rollback(struct task_struct *task,
49 struct pt_regs *regs)
50{
51 regs->ax = regs->orig_ax;
52}
53
54static inline long syscall_get_error(struct task_struct *task,
55 struct pt_regs *regs)
56{
57 unsigned long error = regs->ax;
58#ifdef CONFIG_IA32_EMULATION
59 /*
60 * TS_COMPAT is set for 32-bit syscall entries and then
61 * remains set until we return to user mode.
62 */
63 if (task_thread_info(task)->status & TS_COMPAT)
64 /*
65 * Sign-extend the value so (int)-EFOO becomes (long)-EFOO
66 * and will match correctly in comparisons.
67 */
68 error = (long) (int) error;
69#endif
70 return IS_ERR_VALUE(error) ? error : 0;
71}
72
73static inline long syscall_get_return_value(struct task_struct *task,
74 struct pt_regs *regs)
75{
76 return regs->ax;
77}
78
79static inline void syscall_set_return_value(struct task_struct *task,
80 struct pt_regs *regs,
81 int error, long val)
82{
83 regs->ax = (long) error ?: val;
84}
85
86#ifdef CONFIG_X86_32
87
88static inline void syscall_get_arguments(struct task_struct *task,
89 struct pt_regs *regs,
90 unsigned int i, unsigned int n,
91 unsigned long *args)
92{
93 BUG_ON(i + n > 6);
94 memcpy(args, ®s->bx + i, n * sizeof(args[0]));
95}
96
97static inline void syscall_set_arguments(struct task_struct *task,
98 struct pt_regs *regs,
99 unsigned int i, unsigned int n,
100 const unsigned long *args)
101{
102 BUG_ON(i + n > 6);
103 memcpy(®s->bx + i, args, n * sizeof(args[0]));
104}
105
106static inline int syscall_get_arch(void)
107{
108 return AUDIT_ARCH_I386;
109}
110
111#else /* CONFIG_X86_64 */
112
113static inline void syscall_get_arguments(struct task_struct *task,
114 struct pt_regs *regs,
115 unsigned int i, unsigned int n,
116 unsigned long *args)
117{
118# ifdef CONFIG_IA32_EMULATION
119 if (task_thread_info(task)->status & TS_COMPAT)
120 switch (i) {
121 case 0:
122 if (!n--) break;
123 *args++ = regs->bx;
124 case 1:
125 if (!n--) break;
126 *args++ = regs->cx;
127 case 2:
128 if (!n--) break;
129 *args++ = regs->dx;
130 case 3:
131 if (!n--) break;
132 *args++ = regs->si;
133 case 4:
134 if (!n--) break;
135 *args++ = regs->di;
136 case 5:
137 if (!n--) break;
138 *args++ = regs->bp;
139 case 6:
140 if (!n--) break;
141 default:
142 BUG();
143 break;
144 }
145 else
146# endif
147 switch (i) {
148 case 0:
149 if (!n--) break;
150 *args++ = regs->di;
151 case 1:
152 if (!n--) break;
153 *args++ = regs->si;
154 case 2:
155 if (!n--) break;
156 *args++ = regs->dx;
157 case 3:
158 if (!n--) break;
159 *args++ = regs->r10;
160 case 4:
161 if (!n--) break;
162 *args++ = regs->r8;
163 case 5:
164 if (!n--) break;
165 *args++ = regs->r9;
166 case 6:
167 if (!n--) break;
168 default:
169 BUG();
170 break;
171 }
172}
173
174static inline void syscall_set_arguments(struct task_struct *task,
175 struct pt_regs *regs,
176 unsigned int i, unsigned int n,
177 const unsigned long *args)
178{
179# ifdef CONFIG_IA32_EMULATION
180 if (task_thread_info(task)->status & TS_COMPAT)
181 switch (i) {
182 case 0:
183 if (!n--) break;
184 regs->bx = *args++;
185 case 1:
186 if (!n--) break;
187 regs->cx = *args++;
188 case 2:
189 if (!n--) break;
190 regs->dx = *args++;
191 case 3:
192 if (!n--) break;
193 regs->si = *args++;
194 case 4:
195 if (!n--) break;
196 regs->di = *args++;
197 case 5:
198 if (!n--) break;
199 regs->bp = *args++;
200 case 6:
201 if (!n--) break;
202 default:
203 BUG();
204 break;
205 }
206 else
207# endif
208 switch (i) {
209 case 0:
210 if (!n--) break;
211 regs->di = *args++;
212 case 1:
213 if (!n--) break;
214 regs->si = *args++;
215 case 2:
216 if (!n--) break;
217 regs->dx = *args++;
218 case 3:
219 if (!n--) break;
220 regs->r10 = *args++;
221 case 4:
222 if (!n--) break;
223 regs->r8 = *args++;
224 case 5:
225 if (!n--) break;
226 regs->r9 = *args++;
227 case 6:
228 if (!n--) break;
229 default:
230 BUG();
231 break;
232 }
233}
234
235static inline int syscall_get_arch(void)
236{
237#ifdef CONFIG_IA32_EMULATION
238 /*
239 * TS_COMPAT is set for 32-bit syscall entry and then
240 * remains set until we return to user mode.
241 *
242 * TIF_IA32 tasks should always have TS_COMPAT set at
243 * system call time.
244 *
245 * x32 tasks should be considered AUDIT_ARCH_X86_64.
246 */
247 if (task_thread_info(current)->status & TS_COMPAT)
248 return AUDIT_ARCH_I386;
249#endif
250 /* Both x32 and x86_64 are considered "64-bit". */
251 return AUDIT_ARCH_X86_64;
252}
253#endif /* CONFIG_X86_32 */
254
255#endif /* _ASM_X86_SYSCALL_H */