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2024-02-20 ea08eeccae9297f7aabd2ef7f0c2517ac4549acc 
 kernel/arch/x86/include/asm/syscall.h
....@@ -1,11 +1,8 @@
1
+/* SPDX-License-Identifier: GPL-2.0-only */
12 /*
23  * Access to user system call parameters and results
34  *
45  * 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.
96  *
107  * See asm-generic/syscall.h for descriptions of what we must do here.
118  */
....@@ -16,27 +13,22 @@
1613 #include <uapi/linux/audit.h>
1714 #include <linux/sched.h>
1815 #include <linux/err.h>
19
-#include <asm/asm-offsets.h>	/* For NR_syscalls */
2016 #include <asm/thread_info.h>	/* for TS_COMPAT */
2117 #include <asm/unistd.h>
2218 
23
-#ifdef CONFIG_X86_64
24
-typedef asmlinkage long (*sys_call_ptr_t)(const struct pt_regs *);
25
-#else
26
-typedef asmlinkage long (*sys_call_ptr_t)(unsigned long, unsigned long,
27
-					  unsigned long, unsigned long,
28
-					  unsigned long, unsigned long);
29
-#endif /* CONFIG_X86_64 */
19
+typedef long (*sys_call_ptr_t)(const struct pt_regs *);
3020 extern const sys_call_ptr_t sys_call_table[];
3121 
3222 #if defined(CONFIG_X86_32)
3323 #define ia32_sys_call_table sys_call_table
34
-#define __NR_syscall_compat_max __NR_syscall_max
35
-#define IA32_NR_syscalls NR_syscalls
3624 #endif
3725 
3826 #if defined(CONFIG_IA32_EMULATION)
3927 extern const sys_call_ptr_t ia32_sys_call_table[];
28
+#endif
29
+
30
+#ifdef CONFIG_X86_X32_ABI
31
+extern const sys_call_ptr_t x32_sys_call_table[];
4032 #endif
4133 
4234 /*
....@@ -91,11 +83,9 @@
9183 
9284 static inline void syscall_get_arguments(struct task_struct *task,
9385 					 struct pt_regs *regs,
94
-					 unsigned int i, unsigned int n,
9586 					 unsigned long *args)
9687 {
97
-	BUG_ON(i + n > 6);
98
-	memcpy(args, &regs->bx + i, n * sizeof(args[0]));
88
+	memcpy(args, &regs->bx, 6 * sizeof(args[0]));
9989 }
10090 
10191 static inline void syscall_set_arguments(struct task_struct *task,
....@@ -107,7 +97,7 @@
10797 	memcpy(&regs->bx + i, args, n * sizeof(args[0]));
10898 }
10999 
110
-static inline int syscall_get_arch(void)
100
+static inline int syscall_get_arch(struct task_struct *task)
111101 {
112102 	return AUDIT_ARCH_I386;
113103 }
....@@ -116,131 +106,64 @@
116106 
117107 static inline void syscall_get_arguments(struct task_struct *task,
118108 					 struct pt_regs *regs,
119
-					 unsigned int i, unsigned int n,
120109 					 unsigned long *args)
121110 {
122111 # ifdef CONFIG_IA32_EMULATION
123
-	if (task->thread_info.status & TS_COMPAT)
124
-		switch (i) {
125
-		case 0:
126
-			if (!n--) break;
127
-			*args++ = regs->bx;
128
-		case 1:
129
-			if (!n--) break;
130
-			*args++ = regs->cx;
131
-		case 2:
132
-			if (!n--) break;
133
-			*args++ = regs->dx;
134
-		case 3:
135
-			if (!n--) break;
136
-			*args++ = regs->si;
137
-		case 4:
138
-			if (!n--) break;
139
-			*args++ = regs->di;
140
-		case 5:
141
-			if (!n--) break;
142
-			*args++ = regs->bp;
143
-		case 6:
144
-			if (!n--) break;
145
-		default:
146
-			BUG();
147
-			break;
148
-		}
149
-	else
112
+	if (task->thread_info.status & TS_COMPAT) {
113
+		*args++ = regs->bx;
114
+		*args++ = regs->cx;
115
+		*args++ = regs->dx;
116
+		*args++ = regs->si;
117
+		*args++ = regs->di;
118
+		*args   = regs->bp;
119
+	} else
150120 # endif
151
-		switch (i) {
152
-		case 0:
153
-			if (!n--) break;
154
-			*args++ = regs->di;
155
-		case 1:
156
-			if (!n--) break;
157
-			*args++ = regs->si;
158
-		case 2:
159
-			if (!n--) break;
160
-			*args++ = regs->dx;
161
-		case 3:
162
-			if (!n--) break;
163
-			*args++ = regs->r10;
164
-		case 4:
165
-			if (!n--) break;
166
-			*args++ = regs->r8;
167
-		case 5:
168
-			if (!n--) break;
169
-			*args++ = regs->r9;
170
-		case 6:
171
-			if (!n--) break;
172
-		default:
173
-			BUG();
174
-			break;
175
-		}
121
+	{
122
+		*args++ = regs->di;
123
+		*args++ = regs->si;
124
+		*args++ = regs->dx;
125
+		*args++ = regs->r10;
126
+		*args++ = regs->r8;
127
+		*args   = regs->r9;
128
+	}
176129 }
177130 
178131 static inline void syscall_set_arguments(struct task_struct *task,
179132 					 struct pt_regs *regs,
180
-					 unsigned int i, unsigned int n,
181133 					 const unsigned long *args)
182134 {
183135 # ifdef CONFIG_IA32_EMULATION
184
-	if (task->thread_info.status & TS_COMPAT)
185
-		switch (i) {
186
-		case 0:
187
-			if (!n--) break;
188
-			regs->bx = *args++;
189
-		case 1:
190
-			if (!n--) break;
191
-			regs->cx = *args++;
192
-		case 2:
193
-			if (!n--) break;
194
-			regs->dx = *args++;
195
-		case 3:
196
-			if (!n--) break;
197
-			regs->si = *args++;
198
-		case 4:
199
-			if (!n--) break;
200
-			regs->di = *args++;
201
-		case 5:
202
-			if (!n--) break;
203
-			regs->bp = *args++;
204
-		case 6:
205
-			if (!n--) break;
206
-		default:
207
-			BUG();
208
-			break;
209
-		}
210
-	else
136
+	if (task->thread_info.status & TS_COMPAT) {
137
+		regs->bx = *args++;
138
+		regs->cx = *args++;
139
+		regs->dx = *args++;
140
+		regs->si = *args++;
141
+		regs->di = *args++;
142
+		regs->bp = *args;
143
+	} else
211144 # endif
212
-		switch (i) {
213
-		case 0:
214
-			if (!n--) break;
215
-			regs->di = *args++;
216
-		case 1:
217
-			if (!n--) break;
218
-			regs->si = *args++;
219
-		case 2:
220
-			if (!n--) break;
221
-			regs->dx = *args++;
222
-		case 3:
223
-			if (!n--) break;
224
-			regs->r10 = *args++;
225
-		case 4:
226
-			if (!n--) break;
227
-			regs->r8 = *args++;
228
-		case 5:
229
-			if (!n--) break;
230
-			regs->r9 = *args++;
231
-		case 6:
232
-			if (!n--) break;
233
-		default:
234
-			BUG();
235
-			break;
236
-		}
145
+	{
146
+		regs->di = *args++;
147
+		regs->si = *args++;
148
+		regs->dx = *args++;
149
+		regs->r10 = *args++;
150
+		regs->r8 = *args++;
151
+		regs->r9 = *args;
152
+	}
237153 }
238154 
239
-static inline int syscall_get_arch(void)
155
+static inline int syscall_get_arch(struct task_struct *task)
240156 {
241157 	/* x32 tasks should be considered AUDIT_ARCH_X86_64. */
242
-	return in_ia32_syscall() ? AUDIT_ARCH_I386 : AUDIT_ARCH_X86_64;
158
+	return (IS_ENABLED(CONFIG_IA32_EMULATION) &&
159
+		task->thread_info.status & TS_COMPAT)
160
+		? AUDIT_ARCH_I386 : AUDIT_ARCH_X86_64;
243161 }
162
+
163
+void do_syscall_64(unsigned long nr, struct pt_regs *regs);
164
+void do_int80_syscall_32(struct pt_regs *regs);
165
+long do_fast_syscall_32(struct pt_regs *regs);
166
+
244167 #endif	/* CONFIG_X86_32 */
245168 
246169 #endif	/* _ASM_X86_SYSCALL_H */