xref: /netbsd-src/sys/compat/linux/arch/arm/linux_machdep.c (revision b1c86f5f087524e68db12794ee9c3e3da1ab17a0)
1 /*	$NetBSD: linux_machdep.c,v 1.29 2010/07/07 01:30:33 chs Exp $	*/
2 
3 /*-
4  * Copyright (c) 1995, 2000 The NetBSD Foundation, Inc.
5  * All rights reserved.
6  *
7  * This code is derived from software contributed to The NetBSD Foundation
8  * by Frank van der Linden.
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 #include <sys/cdefs.h>
33 
34 __KERNEL_RCSID(0, "$NetBSD: linux_machdep.c,v 1.29 2010/07/07 01:30:33 chs Exp $");
35 
36 #include <sys/param.h>
37 #include <sys/systm.h>
38 #include <sys/signalvar.h>
39 #include <sys/kernel.h>
40 #include <sys/proc.h>
41 #include <sys/buf.h>
42 #include <sys/reboot.h>
43 #include <sys/conf.h>
44 #include <sys/exec.h>
45 #include <sys/file.h>
46 #include <sys/callout.h>
47 #include <sys/malloc.h>
48 #include <sys/mbuf.h>
49 #include <sys/msgbuf.h>
50 #include <sys/mount.h>
51 #include <sys/vnode.h>
52 #include <sys/device.h>
53 #include <sys/syscallargs.h>
54 #include <sys/filedesc.h>
55 #include <sys/exec_elf.h>
56 #include <sys/disklabel.h>
57 #include <sys/ioctl.h>
58 #include <miscfs/specfs/specdev.h>
59 
60 #include <compat/linux/common/linux_types.h>
61 #include <compat/linux/common/linux_signal.h>
62 #include <compat/linux/common/linux_util.h>
63 #include <compat/linux/common/linux_ioctl.h>
64 #include <compat/linux/common/linux_hdio.h>
65 #include <compat/linux/common/linux_exec.h>
66 #include <compat/linux/common/linux_machdep.h>
67 #include <compat/linux/linux_syscallargs.h>
68 
69 void
70 linux_setregs(struct lwp *l, struct exec_package *epp, vaddr_t stack)
71 {
72 
73 	setregs(l, epp, stack);
74 }
75 
76 void
77 linux_sendsig(const ksiginfo_t *ksi, const sigset_t *mask)
78 {
79 	struct lwp *l = curlwp;
80 	struct proc *p = l->l_proc;
81 	struct trapframe *tf;
82 	struct linux_sigframe *fp, frame;
83 	int onstack, error;
84 	const int sig = ksi->ksi_signo;
85 	sig_t catcher = SIGACTION(p, sig).sa_handler;
86 
87 	tf = process_frame(l);
88 
89 	/*
90 	 * The Linux version of this code is in
91 	 * linux/arch/arm/kernel/signal.c.
92 	 */
93 
94 	/* Do we need to jump onto the signal stack? */
95 	onstack =
96 	    (l->l_sigstk.ss_flags & (SS_DISABLE | SS_ONSTACK)) == 0 &&
97 	    (SIGACTION(p, sig).sa_flags & SA_ONSTACK) != 0;
98 
99 	/* Allocate space for the signal handler context. */
100 	if (onstack)
101 		fp = (struct linux_sigframe *)((char *)l->l_sigstk.ss_sp +
102 					  l->l_sigstk.ss_size);
103 	else
104 		fp = (struct linux_sigframe *)tf->tf_usr_sp;
105 	fp--;
106 
107 	/* Build stack frame for signal trampoline. */
108 
109 	/* Save register context. */
110 	frame.sf_sc.sc_r0     = tf->tf_r0;
111 	frame.sf_sc.sc_r1     = tf->tf_r1;
112 	frame.sf_sc.sc_r2     = tf->tf_r2;
113 	frame.sf_sc.sc_r3     = tf->tf_r3;
114 	frame.sf_sc.sc_r4     = tf->tf_r4;
115 	frame.sf_sc.sc_r5     = tf->tf_r5;
116 	frame.sf_sc.sc_r6     = tf->tf_r6;
117 	frame.sf_sc.sc_r7     = tf->tf_r7;
118 	frame.sf_sc.sc_r8     = tf->tf_r8;
119 	frame.sf_sc.sc_r9     = tf->tf_r9;
120 	frame.sf_sc.sc_r10    = tf->tf_r10;
121 	frame.sf_sc.sc_r11    = tf->tf_r11;
122 	frame.sf_sc.sc_r12    = tf->tf_r12;
123 	frame.sf_sc.sc_sp     = tf->tf_usr_sp;
124 	frame.sf_sc.sc_lr     = tf->tf_usr_lr;
125 	frame.sf_sc.sc_pc     = tf->tf_pc;
126 	frame.sf_sc.sc_cpsr   = tf->tf_spsr;
127 
128 	/* Save signal stack. */
129 	/* Linux doesn't save the onstack flag in sigframe */
130 
131 	/* Save signal mask. */
132 	native_to_linux_old_extra_sigset(&frame.sf_sc.sc_mask,
133 	    frame.sf_extramask, mask);
134 
135 	/* Other state (mostly faked) */
136 	/*
137 	 * trapno should indicate the trap that caused the signal:
138 	 * 6  -> undefined instruction
139 	 * 11 -> address exception
140 	 * 14 -> data/prefetch abort
141 	 */
142 	frame.sf_sc.sc_trapno = 0;
143 	frame.sf_sc.sc_error_code = 0;
144 	frame.sf_sc.sc_fault_address = (u_int32_t) ksi->ksi_addr;
145 	sendsig_reset(l, sig);
146 
147 	mutex_exit(p->p_lock);
148 	error = copyout(&frame, fp, sizeof(frame));
149 	mutex_enter(p->p_lock);
150 
151 	if (error != 0) {
152 		/*
153 		 * Process has trashed its stack; give it an illegal
154 		 * instruction to halt it in its tracks.
155 		 */
156 		sigexit(l, SIGILL);
157 		/* NOTREACHED */
158 	}
159 	/*
160 	 * Build context to run handler in.
161 	 */
162 	tf->tf_r0 = native_to_linux_signo[sig];
163 	tf->tf_r1 = 0; /* XXX Should be a siginfo_t */
164 	tf->tf_r2 = 0;
165 	tf->tf_r3 = (register_t)catcher;
166 	tf->tf_usr_sp = (register_t)fp;
167 	tf->tf_pc = (register_t)p->p_sigctx.ps_sigcode;
168 
169 	/* Remember that we're now on the signal stack. */
170 	if (onstack)
171 		l->l_sigstk.ss_flags |= SS_ONSTACK;
172 
173 }
174 
175 #if 0
176 /*
177  * System call to cleanup state after a signal
178  * has been taken.  Reset signal mask and
179  * stack state from context left by sendsig (above).
180  * Return to previous pc and psl as specified by
181  * context left by sendsig. Check carefully to
182  * make sure that the user has not modified the
183  * psl to gain improper privileges or to cause
184  * a machine fault.
185  */
186 int
187 linux_sys_rt_sigreturn(struct proc *p, void *v, register_t *retval)
188 {
189 	/* XXX XAX write me */
190 	return(ENOSYS);
191 }
192 #endif
193 
194 int
195 linux_sys_sigreturn(struct lwp *l, const struct linux_sys_sigreturn_args *v,
196 	register_t *retval)
197 {
198 	struct linux_sigframe *sfp, frame;
199 	struct proc *p = l->l_proc;
200 	struct trapframe *tf;
201 	sigset_t mask;
202 
203 	tf = process_frame(l);
204 
205 	/*
206 	 * The trampoline code hands us the context.
207 	 * It is unsafe to keep track of it ourselves, in the event that a
208 	 * program jumps out of a signal handler.
209 	 */
210 	sfp = (struct linux_sigframe *)tf->tf_usr_sp;
211 	if (copyin((void *)sfp, &frame, sizeof(*sfp)) != 0)
212 		return (EFAULT);
213 
214 	/*
215 	 * Make sure the processor mode has not been tampered with and
216 	 * interrupts have not been disabled.
217 	 */
218 	if (!VALID_R15_PSR(frame.sf_sc.sc_pc, frame.sf_sc.sc_cpsr))
219 		return EINVAL;
220 
221 	/* Restore register context. */
222 	tf = process_frame(l);
223 	tf->tf_r0    = frame.sf_sc.sc_r0;
224 	tf->tf_r1    = frame.sf_sc.sc_r1;
225 	tf->tf_r2    = frame.sf_sc.sc_r2;
226 	tf->tf_r3    = frame.sf_sc.sc_r3;
227 	tf->tf_r4    = frame.sf_sc.sc_r4;
228 	tf->tf_r5    = frame.sf_sc.sc_r5;
229 	tf->tf_r6    = frame.sf_sc.sc_r6;
230 	tf->tf_r7    = frame.sf_sc.sc_r7;
231 	tf->tf_r8    = frame.sf_sc.sc_r8;
232 	tf->tf_r9    = frame.sf_sc.sc_r9;
233 	tf->tf_r10   = frame.sf_sc.sc_r10;
234 	tf->tf_r11   = frame.sf_sc.sc_r11;
235 	tf->tf_r12   = frame.sf_sc.sc_r12;
236 	tf->tf_usr_sp = frame.sf_sc.sc_sp;
237 	tf->tf_usr_lr = frame.sf_sc.sc_lr;
238 	tf->tf_pc    = frame.sf_sc.sc_pc;
239 	tf->tf_spsr  = frame.sf_sc.sc_cpsr;
240 
241 	mutex_enter(p->p_lock);
242 
243 	/* Restore signal stack. */
244 	l->l_sigstk.ss_flags &= ~SS_ONSTACK;
245 
246 	/* Restore signal mask. */
247 	linux_old_extra_to_native_sigset(&mask, &frame.sf_sc.sc_mask,
248 	    frame.sf_extramask);
249 	(void) sigprocmask1(l, SIG_SETMASK, &mask, 0);
250 
251 	mutex_exit(p->p_lock);
252 
253 	return (EJUSTRETURN);
254 }
255 
256 /*
257  * major device numbers remapping
258  */
259 dev_t
260 linux_fakedev(dev_t dev, int raw)
261 {
262 	/* XXX write me */
263 	return dev;
264 }
265 
266 /*
267  * We come here in a last attempt to satisfy a Linux ioctl() call
268  */
269 int
270 linux_machdepioctl(struct lwp *l, const struct linux_sys_ioctl_args *uap, register_t *retval)
271 {
272 	/* {
273 		syscallarg(int) fd;
274 		syscallarg(u_long) com;
275 		syscallarg(void *) data;
276 	} */
277 	struct sys_ioctl_args bia;
278 	u_long com;
279 
280 	SCARG(&bia, fd) = SCARG(uap, fd);
281 	SCARG(&bia, data) = SCARG(uap, data);
282 	com = SCARG(uap, com);
283 
284 	switch (com) {
285 	default:
286 		printf("linux_machdepioctl: invalid ioctl %08lx\n", com);
287 		return EINVAL;
288 	}
289 	SCARG(&bia, com) = com;
290 
291 	return sys_ioctl(l, &bia, retval);
292 }
293 
294 int
295 linux_usertrap(struct lwp *l, vaddr_t trapaddr, void *arg)
296 {
297 	return 0;
298 }
299