1/*	$NetBSD: linux_machdep.c,v 1.28 2009/11/23 00:46:06 rmind 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 1.28 2009/11/23 00:46:06 rmind 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
69void
70linux_setregs(struct lwp *l, struct exec_package *epp, vaddr_t stack)
71{
72
73	setregs(l, epp, stack);
74}
75
76void
77linux_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 */
186int
187linux_sys_rt_sigreturn(struct proc *p, void *v, register_t *retval)
188{
189	/* XXX XAX write me */
190	return(ENOSYS);
191}
192#endif
193
194int
195linux_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 */
259dev_t
260linux_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 */
269int
270linux_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
294int
295linux_usertrap(struct lwp *l, vaddr_t trapaddr, void *arg)
296{
297	return 0;
298}
299