linux_machdep.c revision 1.32 
1/*	$NetBSD: linux_machdep.c,v 1.32 2014/11/09 17:48:07 maxv 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 1.32 2014/11/09 17:48:07 maxv 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/mbuf.h>
48#include <sys/msgbuf.h>
49#include <sys/mount.h>
50#include <sys/vnode.h>
51#include <sys/device.h>
52#include <sys/syscallargs.h>
53#include <sys/filedesc.h>
54#include <sys/exec_elf.h>
55#include <sys/disklabel.h>
56#include <sys/ioctl.h>
57
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#include <arm/locore.h>
70
71void
72linux_setregs(struct lwp *l, struct exec_package *epp, vaddr_t stack)
73{
74
75	setregs(l, epp, stack);
76}
77
78void
79linux_sendsig(const ksiginfo_t *ksi, const sigset_t *mask)
80{
81	struct lwp * const l = curlwp;
82	struct proc * const p = l->l_proc;
83	struct trapframe * const tf = lwp_trapframe(l);
84	struct linux_sigframe *fp, frame;
85	int onstack, error;
86	const int sig = ksi->ksi_signo;
87	sig_t catcher = SIGACTION(p, sig).sa_handler;
88
89
90	/*
91	 * The Linux version of this code is in
92	 * linux/arch/arm/kernel/signal.c.
93	 */
94
95	/* Do we need to jump onto the signal stack? */
96	onstack =
97	    (l->l_sigstk.ss_flags & (SS_DISABLE | SS_ONSTACK)) == 0 &&
98	    (SIGACTION(p, sig).sa_flags & SA_ONSTACK) != 0;
99
100	/* Allocate space for the signal handler context. */
101	if (onstack)
102		fp = (struct linux_sigframe *)((char *)l->l_sigstk.ss_sp +
103					  l->l_sigstk.ss_size);
104	else
105		fp = (struct linux_sigframe *)tf->tf_usr_sp;
106	fp--;
107
108	/* Build stack frame for signal trampoline. */
109
110	/* Save register context. */
111	frame.sf_sc.sc_r0     = tf->tf_r0;
112	frame.sf_sc.sc_r1     = tf->tf_r1;
113	frame.sf_sc.sc_r2     = tf->tf_r2;
114	frame.sf_sc.sc_r3     = tf->tf_r3;
115	frame.sf_sc.sc_r4     = tf->tf_r4;
116	frame.sf_sc.sc_r5     = tf->tf_r5;
117	frame.sf_sc.sc_r6     = tf->tf_r6;
118	frame.sf_sc.sc_r7     = tf->tf_r7;
119	frame.sf_sc.sc_r8     = tf->tf_r8;
120	frame.sf_sc.sc_r9     = tf->tf_r9;
121	frame.sf_sc.sc_r10    = tf->tf_r10;
122	frame.sf_sc.sc_r11    = tf->tf_r11;
123	frame.sf_sc.sc_r12    = tf->tf_r12;
124	frame.sf_sc.sc_sp     = tf->tf_usr_sp;
125	frame.sf_sc.sc_lr     = tf->tf_usr_lr;
126	frame.sf_sc.sc_pc     = tf->tf_pc;
127	frame.sf_sc.sc_cpsr   = tf->tf_spsr;
128
129	/* Save signal stack. */
130	/* Linux doesn't save the onstack flag in sigframe */
131
132	/* Save signal mask. */
133	native_to_linux_old_extra_sigset(&frame.sf_sc.sc_mask,
134	    frame.sf_extramask, mask);
135
136	/* Other state (mostly faked) */
137	/*
138	 * trapno should indicate the trap that caused the signal:
139	 * 6  -> undefined instruction
140	 * 11 -> address exception
141	 * 14 -> data/prefetch abort
142	 */
143	frame.sf_sc.sc_trapno = 0;
144	frame.sf_sc.sc_error_code = 0;
145	frame.sf_sc.sc_fault_address = (u_int32_t) ksi->ksi_addr;
146	sendsig_reset(l, sig);
147
148	mutex_exit(p->p_lock);
149	error = copyout(&frame, fp, sizeof(frame));
150	mutex_enter(p->p_lock);
151
152	if (error != 0) {
153		/*
154		 * Process has trashed its stack; give it an illegal
155		 * instruction to halt it in its tracks.
156		 */
157		sigexit(l, SIGILL);
158		/* NOTREACHED */
159	}
160	/*
161	 * Build context to run handler in.
162	 */
163	tf->tf_r0 = native_to_linux_signo[sig];
164	tf->tf_r1 = 0; /* XXX Should be a siginfo_t */
165	tf->tf_r2 = 0;
166	tf->tf_r3 = (register_t)catcher;
167	tf->tf_usr_sp = (register_t)fp;
168	tf->tf_pc = (register_t)p->p_sigctx.ps_sigcode;
169
170	/* Remember that we're now on the signal stack. */
171	if (onstack)
172		l->l_sigstk.ss_flags |= SS_ONSTACK;
173
174}
175
176#if 0
177/*
178 * System call to cleanup state after a signal
179 * has been taken.  Reset signal mask and
180 * stack state from context left by sendsig (above).
181 * Return to previous pc and psl as specified by
182 * context left by sendsig. Check carefully to
183 * make sure that the user has not modified the
184 * psl to gain improper privileges or to cause
185 * a machine fault.
186 */
187int
188linux_sys_rt_sigreturn(struct proc *p, void *v, register_t *retval)
189{
190	/* XXX XAX write me */
191	return(ENOSYS);
192}
193#endif
194
195int
196linux_sys_sigreturn(struct lwp *l, const struct linux_sys_sigreturn_args *v,
197	register_t *retval)
198{
199	struct trapframe * const tf = lwp_trapframe(l);
200	struct proc * const p = l->l_proc;
201	struct linux_sigframe *sfp, frame;
202	sigset_t mask;
203
204	/*
205	 * The trampoline code hands us the context.
206	 * It is unsafe to keep track of it ourselves, in the event that a
207	 * program jumps out of a signal handler.
208	 */
209	sfp = (struct linux_sigframe *)tf->tf_usr_sp;
210	if (copyin((void *)sfp, &frame, sizeof(*sfp)) != 0)
211		return (EFAULT);
212
213	/*
214	 * Make sure the processor mode has not been tampered with and
215	 * interrupts have not been disabled.
216	 */
217	if (!VALID_R15_PSR(frame.sf_sc.sc_pc, frame.sf_sc.sc_cpsr))
218		return EINVAL;
219
220	/* Restore register context. */
221	tf->tf_r0    = frame.sf_sc.sc_r0;
222	tf->tf_r1    = frame.sf_sc.sc_r1;
223	tf->tf_r2    = frame.sf_sc.sc_r2;
224	tf->tf_r3    = frame.sf_sc.sc_r3;
225	tf->tf_r4    = frame.sf_sc.sc_r4;
226	tf->tf_r5    = frame.sf_sc.sc_r5;
227	tf->tf_r6    = frame.sf_sc.sc_r6;
228	tf->tf_r7    = frame.sf_sc.sc_r7;
229	tf->tf_r8    = frame.sf_sc.sc_r8;
230	tf->tf_r9    = frame.sf_sc.sc_r9;
231	tf->tf_r10   = frame.sf_sc.sc_r10;
232	tf->tf_r11   = frame.sf_sc.sc_r11;
233	tf->tf_r12   = frame.sf_sc.sc_r12;
234	tf->tf_usr_sp = frame.sf_sc.sc_sp;
235	tf->tf_usr_lr = frame.sf_sc.sc_lr;
236	tf->tf_pc    = frame.sf_sc.sc_pc;
237	tf->tf_spsr  = frame.sf_sc.sc_cpsr;
238
239	mutex_enter(p->p_lock);
240
241	/* Restore signal stack. */
242	l->l_sigstk.ss_flags &= ~SS_ONSTACK;
243
244	/* Restore signal mask. */
245	linux_old_extra_to_native_sigset(&mask, &frame.sf_sc.sc_mask,
246	    frame.sf_extramask);
247	(void) sigprocmask1(l, SIG_SETMASK, &mask, 0);
248
249	mutex_exit(p->p_lock);
250
251	return (EJUSTRETURN);
252}
253
254/*
255 * major device numbers remapping
256 */
257dev_t
258linux_fakedev(dev_t dev, int raw)
259{
260	/* XXX write me */
261	return dev;
262}
263
264/*
265 * We come here in a last attempt to satisfy a Linux ioctl() call
266 */
267int
268linux_machdepioctl(struct lwp *l, const struct linux_sys_ioctl_args *uap, register_t *retval)
269{
270	/* {
271		syscallarg(int) fd;
272		syscallarg(u_long) com;
273		syscallarg(void *) data;
274	} */
275	struct sys_ioctl_args bia;
276	u_long com;
277
278	SCARG(&bia, fd) = SCARG(uap, fd);
279	SCARG(&bia, data) = SCARG(uap, data);
280	com = SCARG(uap, com);
281
282	switch (com) {
283	default:
284		printf("linux_machdepioctl: invalid ioctl %08lx\n", com);
285		return EINVAL;
286	}
287	SCARG(&bia, com) = com;
288
289	return sys_ioctl(l, &bia, retval);
290}
291
292int
293linux_usertrap(struct lwp *l, vaddr_t trapaddr, void *arg)
294{
295	return 0;
296}
297