1 /* $NetBSD: linux_syscall.c,v 1.27 2015/03/07 18:52:46 christos Exp $ */
2
3 /*-
4 * Copyright (c) 2000, 2003 The NetBSD Foundation, Inc.
5 * All rights reserved.
6 *
7 * This code is derived from software contributed to The NetBSD Foundation
8 * by Charles M. Hannum.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
29 * POSSIBILITY OF SUCH DAMAGE.
30 */
31
32 /*
33 * Copyright (c) 1994-1998 Mark Brinicombe.
34 * Copyright (c) 1994 Brini.
35 * All rights reserved.
36 *
37 * This code is derived from software written for Brini by Mark Brinicombe
38 *
39 * Redistribution and use in source and binary forms, with or without
40 * modification, are permitted provided that the following conditions
41 * are met:
42 * 1. Redistributions of source code must retain the above copyright
43 * notice, this list of conditions and the following disclaimer.
44 * 2. Redistributions in binary form must reproduce the above copyright
45 * notice, this list of conditions and the following disclaimer in the
46 * documentation and/or other materials provided with the distribution.
47 * 3. All advertising materials mentioning features or use of this software
48 * must display the following acknowledgement:
49 * This product includes software developed by Mark Brinicombe
50 * for the NetBSD Project.
51 * 4. The name of the company nor the name of the author may be used to
52 * endorse or promote products derived from this software without specific
53 * prior written permission.
54 *
55 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
56 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
57 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
58 * IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
59 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
60 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
61 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
62 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
63 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
64 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
65 * SUCH DAMAGE.
66 *
67 * ARMLinux emulation: syscall entry handling
68 */
69
70 #include <sys/param.h>
71
72 __KERNEL_RCSID(0, "$NetBSD: linux_syscall.c,v 1.27 2015/03/07 18:52:46 christos Exp $");
73
74 #include <sys/device.h>
75 #include <sys/errno.h>
76 #include <sys/kernel.h>
77 #include <sys/reboot.h>
78 #include <sys/signalvar.h>
79 #include <sys/systm.h>
80 #include <sys/syscallvar.h>
81 #include <sys/cpu.h>
82
83 #include <uvm/uvm_extern.h>
84
85 #include <arm/swi.h>
86 #include <arm/locore.h>
87
88 #include <compat/linux/common/linux_errno.h>
89 #include <compat/linux/linux_syscall.h>
90
91 /* ARMLinux has some system calls of its very own. */
92 #define LINUX_ARM_NR_BASE 0x9f0000
93 #define LINUX_EARM_NR_BASE 0x0f0000
94 #define LINUX_SYS_ARMBASE 0x000180 /* Must agree with syscalls.master */
95
96 void linux_syscall_intern(struct proc *);
97 void linux_syscall_plain(struct trapframe *, struct lwp *, uint32_t);
98 void linux_syscall_fancy(struct trapframe *, struct lwp *, uint32_t);
99
100 void
linux_syscall_intern(struct proc * p)101 linux_syscall_intern(struct proc *p)
102 {
103
104 if (trace_is_enabled(p))
105 p->p_md.md_syscall = linux_syscall_fancy;
106 else
107 p->p_md.md_syscall = linux_syscall_plain;
108 }
109
110 void
linux_syscall_plain(trapframe_t * frame,struct lwp * l,uint32_t insn)111 linux_syscall_plain(trapframe_t *frame, struct lwp *l, uint32_t insn)
112 {
113 const struct sysent *callp;
114 struct proc *p = l->l_proc;
115 int code, error;
116 register_t *args, rval[2];
117
118 code = insn & 0x00ffffff;
119 if (code == 0) { /* EABI */
120 code = frame->tf_r7;
121 if (code > LINUX_EARM_NR_BASE)
122 code = code - LINUX_EARM_NR_BASE + LINUX_SYS_ARMBASE;
123 } else {
124 /* Remap ARM-specific syscalls onto the end of the standard range. */
125 if (code > LINUX_ARM_NR_BASE)
126 code = code - LINUX_ARM_NR_BASE + LINUX_SYS_ARMBASE;
127 }
128 code &= LINUX_SYS_NSYSENT - 1;
129
130 /* Linux passes all arguments in order in registers, which is nice. */
131 args = &frame->tf_r0;
132 callp = p->p_emul->e_sysent + code;
133
134 rval[0] = 0;
135 rval[1] = 0;
136 error = sy_call(callp, l, args, rval);
137
138 switch (error) {
139 case 0:
140 frame->tf_r0 = rval[0];
141 break;
142
143 case ERESTART:
144 /* Reconstruct the pc to point at the swi. */
145 frame->tf_pc -= INSN_SIZE;
146 break;
147
148 case EJUSTRETURN:
149 /* nothing to do */
150 break;
151
152 default:
153 error = native_to_linux_errno[error];
154 frame->tf_r0 = error;
155 break;
156 }
157
158 userret(l);
159 }
160
161 void
linux_syscall_fancy(trapframe_t * frame,struct lwp * l,uint32_t insn)162 linux_syscall_fancy(trapframe_t *frame, struct lwp *l, uint32_t insn)
163 {
164 const struct sysent *callp;
165 struct proc *p = l->l_proc;
166 int code, error;
167 register_t *args, rval[2];
168
169 code = insn & 0x00ffffff;
170 if (code == 0) { /* EABI */
171 code = frame->tf_r7;
172 if (code > LINUX_EARM_NR_BASE)
173 code = code - LINUX_EARM_NR_BASE + LINUX_SYS_ARMBASE;
174 } else {
175 /* Remap ARM-specific syscalls onto the end of the standard range. */
176 if (code > LINUX_ARM_NR_BASE)
177 code = code - LINUX_ARM_NR_BASE + LINUX_SYS_ARMBASE;
178 }
179 code &= LINUX_SYS_NSYSENT - 1;
180
181 /* Linux passes all arguments in order in registers, which is nice. */
182 args = &frame->tf_r0;
183 callp = p->p_emul->e_sysent + code;
184
185 if ((error = trace_enter(code, callp, args)) != 0)
186 goto out;
187
188 rval[0] = 0;
189 rval[1] = 0;
190 error = sy_call(callp, l, args, rval);
191 out:
192 switch (error) {
193 case 0:
194 frame->tf_r0 = rval[0];
195 break;
196
197 case ERESTART:
198 /* Reconstruct the pc to point at the swi. */
199 frame->tf_pc -= INSN_SIZE;
200 break;
201
202 case EJUSTRETURN:
203 /* nothing to do */
204 break;
205
206 default:
207 error = native_to_linux_errno[error];
208 frame->tf_r0 = error;
209 break;
210 }
211
212 trace_exit(code, callp, args, rval, error);
213
214 userret(l);
215 }
216