xref: /netbsd-src/sys/compat/linux/arch/mips/linux_machdep.c (revision b1c86f5f087524e68db12794ee9c3e3da1ab17a0)
1 /*	$NetBSD: linux_machdep.c,v 1.41 2010/07/07 01:30:34 chs Exp $ */
2 
3 /*-
4  * Copyright (c) 1995, 2000, 2001 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 and Emmanuel Dreyfus.
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 __KERNEL_RCSID(0, "$NetBSD: linux_machdep.c,v 1.41 2010/07/07 01:30:34 chs Exp $");
34 
35 #include <sys/param.h>
36 #include <sys/systm.h>
37 #include <sys/signalvar.h>
38 #include <sys/kernel.h>
39 #include <sys/proc.h>
40 #include <sys/buf.h>
41 #include <sys/reboot.h>
42 #include <sys/conf.h>
43 #include <sys/exec.h>
44 #include <sys/file.h>
45 #include <sys/callout.h>
46 #include <sys/malloc.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 #include <sys/sysctl.h>
58 #include <sys/kauth.h>
59 #include <miscfs/specfs/specdev.h>
60 
61 #include <compat/linux/common/linux_types.h>
62 #include <compat/linux/common/linux_signal.h>
63 #include <compat/linux/common/linux_util.h>
64 #include <compat/linux/common/linux_ioctl.h>
65 #include <compat/linux/common/linux_hdio.h>
66 #include <compat/linux/common/linux_exec.h>
67 #include <compat/linux/common/linux_machdep.h>
68 
69 #include <compat/linux/linux_syscallargs.h>
70 
71 #include <sys/cpu.h>
72 #include <machine/psl.h>
73 #include <machine/reg.h>
74 #include <machine/regnum.h>
75 #include <machine/vmparam.h>
76 #include <machine/locore.h>
77 
78 #include <mips/cache.h>
79 
80 /*
81  * To see whether wscons is configured (for virtual console ioctl calls).
82  */
83 #if defined(_KERNEL_OPT)
84 #include "wsdisplay.h"
85 #endif
86 #if (NWSDISPLAY > 0)
87 #include <dev/wscons/wsconsio.h>
88 #include <dev/wscons/wsdisplay_usl_io.h>
89 #endif
90 
91 /*
92  * Set set up registers on exec.
93  */
94 void
95 linux_setregs(struct lwp *l, struct exec_package *pack, vaddr_t stack)
96 {
97 	setregs(l, pack, stack);
98 	return;
99 }
100 
101 /*
102  * Send an interrupt to process.
103  *
104  * Adapted from sys/arch/mips/mips/mips_machdep.c
105  *
106  * XXX Does not work well yet with RT signals
107  *
108  */
109 
110 void
111 linux_sendsig(const ksiginfo_t *ksi, const sigset_t *mask)
112 {
113 	const int sig = ksi->ksi_signo;
114 	struct lwp *l = curlwp;
115 	struct proc *p = l->l_proc;
116 	struct linux_sigframe *fp;
117 	struct frame *f;
118 	int i, onstack, error;
119 	sig_t catcher = SIGACTION(p, sig).sa_handler;
120 	struct linux_sigframe sf;
121 
122 #ifdef DEBUG_LINUX
123 	printf("linux_sendsig()\n");
124 #endif /* DEBUG_LINUX */
125 	f = (struct frame *)l->l_md.md_regs;
126 
127 	/*
128 	 * Do we need to jump onto the signal stack?
129 	 */
130 	onstack =
131 	    (l->l_sigstk.ss_flags & (SS_DISABLE | SS_ONSTACK)) == 0 &&
132 	    (SIGACTION(p, sig).sa_flags & SA_ONSTACK) != 0;
133 
134 	/*
135 	 * Signal stack is broken (see at the end of linux_sigreturn), so we do
136 	 * not use it yet. XXX fix this.
137 	 */
138 	onstack=0;
139 
140 	/*
141 	 * Allocate space for the signal handler context.
142 	 */
143 	if (onstack)
144 		fp = (struct linux_sigframe *)
145 		    ((uintptr_t)l->l_sigstk.ss_sp
146 		    + l->l_sigstk.ss_size);
147 	else
148 		/* cast for O64 ABI case */
149 		fp = (struct linux_sigframe *)(uintptr_t)f->f_regs[_R_SP];
150 
151 	/*
152 	 * Build stack frame for signal trampoline.
153 	 */
154 	memset(&sf, 0, sizeof sf);
155 
156 	/*
157 	 * This is the signal trampoline used by Linux, we don't use it,
158 	 * but we set it up in case an application expects it to be there
159 	 */
160 	sf.lsf_code[0] = 0x24020000;	/* li	v0, __NR_sigreturn	*/
161 	sf.lsf_code[1] = 0x0000000c;	/* syscall			*/
162 
163 	native_to_linux_sigset(&sf.lsf_mask, mask);
164 	for (i=0; i<32; i++) {
165 		sf.lsf_sc.lsc_regs[i] = f->f_regs[i];
166 	}
167 	sf.lsf_sc.lsc_mdhi = f->f_regs[_R_MULHI];
168 	sf.lsf_sc.lsc_mdlo = f->f_regs[_R_MULLO];
169 	sf.lsf_sc.lsc_pc = f->f_regs[_R_PC];
170 	sf.lsf_sc.lsc_status = f->f_regs[_R_SR];
171 	sf.lsf_sc.lsc_cause = f->f_regs[_R_CAUSE];
172 	sf.lsf_sc.lsc_badvaddr = f->f_regs[_R_BADVADDR];
173 	sendsig_reset(l, sig);
174 
175 	/*
176 	 * Save signal stack.  XXX broken
177 	 */
178 	/* kregs.sc_onstack = l->l_sigstk.ss_flags & SS_ONSTACK; */
179 
180 	/*
181 	 * Install the sigframe onto the stack
182 	 */
183 	fp -= sizeof(struct linux_sigframe);
184 	mutex_exit(p->p_lock);
185 	error = copyout(&sf, fp, sizeof(sf));
186 	mutex_enter(p->p_lock);
187 
188 	if (error != 0) {
189 		/*
190 		 * Process has trashed its stack; give it an illegal
191 		 * instruction to halt it in its tracks.
192 		 */
193 #ifdef DEBUG_LINUX
194 		printf("linux_sendsig: stack trashed\n");
195 #endif /* DEBUG_LINUX */
196 		sigexit(l, SIGILL);
197 		/* NOTREACHED */
198 	}
199 
200 	/* Set up the registers to return to sigcode. */
201 	f->f_regs[_R_A0] = native_to_linux_signo[sig];
202 	f->f_regs[_R_A1] = 0;
203 	f->f_regs[_R_A2] = (unsigned long)&fp->lsf_sc;
204 
205 #ifdef DEBUG_LINUX
206 	printf("sigcontext is at %p\n", &fp->lsf_sc);
207 #endif /* DEBUG_LINUX */
208 
209 	f->f_regs[_R_SP] = (unsigned long)fp;
210 	/* Signal trampoline code is at base of user stack. */
211 	f->f_regs[_R_RA] = (unsigned long)p->p_sigctx.ps_sigcode;
212 	f->f_regs[_R_T9] = (unsigned long)catcher;
213 	f->f_regs[_R_PC] = (unsigned long)catcher;
214 
215 	/* Remember that we're now on the signal stack. */
216 	if (onstack)
217 		l->l_sigstk.ss_flags |= SS_ONSTACK;
218 
219 	return;
220 }
221 
222 /*
223  * System call to cleanup state after a signal
224  * has been taken.  Reset signal mask and
225  * stack state from context left by sendsig (above).
226  */
227 int
228 linux_sys_sigreturn(struct lwp *l, const struct linux_sys_sigreturn_args *uap, register_t *retval)
229 {
230 	/* {
231 		syscallarg(struct linux_sigframe *) sf;
232 	} */
233 	struct proc *p = l->l_proc;
234 	struct linux_sigframe *sf, ksf;
235 	struct frame *f;
236 	sigset_t mask;
237 	int i, error;
238 
239 #ifdef DEBUG_LINUX
240 	printf("linux_sys_sigreturn()\n");
241 #endif /* DEBUG_LINUX */
242 
243 	/*
244 	 * The trampoline code hands us the context.
245 	 * It is unsafe to keep track of it ourselves, in the event that a
246 	 * program jumps out of a signal handler.
247 	 */
248 	sf = SCARG(uap, sf);
249 
250 	if ((error = copyin(sf, &ksf, sizeof(ksf))) != 0)
251 		return (error);
252 
253 	/* Restore the register context. */
254 	f = (struct frame *)l->l_md.md_regs;
255 	for (i=0; i<32; i++)
256 		f->f_regs[i] = ksf.lsf_sc.lsc_regs[i];
257 	f->f_regs[_R_MULLO] = ksf.lsf_sc.lsc_mdlo;
258 	f->f_regs[_R_MULHI] = ksf.lsf_sc.lsc_mdhi;
259 	f->f_regs[_R_PC] = ksf.lsf_sc.lsc_pc;
260 	f->f_regs[_R_BADVADDR] = ksf.lsf_sc.lsc_badvaddr;
261 	f->f_regs[_R_CAUSE] = ksf.lsf_sc.lsc_cause;
262 
263 	mutex_enter(p->p_lock);
264 
265 	/* Restore signal stack. */
266 	l->l_sigstk.ss_flags &= ~SS_ONSTACK;
267 
268 	/* Restore signal mask. */
269 	linux_to_native_sigset(&mask, (linux_sigset_t *)&ksf.lsf_mask);
270 	(void)sigprocmask1(l, SIG_SETMASK, &mask, 0);
271 
272 	mutex_exit(p->p_lock);
273 
274 	return (EJUSTRETURN);
275 }
276 
277 
278 int
279 linux_sys_rt_sigreturn(struct lwp *l, const struct linux_sys_rt_sigreturn_args *v, register_t *retval)
280 {
281 	return (ENOSYS);
282 }
283 
284 
285 #if 0
286 int
287 linux_sys_modify_ldt(struct lwp *l, const struct linux_sys_modify_ldt_args *uap, register_t *retval)
288 {
289 	/*
290 	 * This syscall is not implemented in Linux/Mips: we should not
291 	 * be here
292 	 */
293 #ifdef DEBUG_LINUX
294 	printf("linux_sys_modify_ldt: should not be here.\n");
295 #endif /* DEBUG_LINUX */
296   return 0;
297 }
298 #endif
299 
300 /*
301  * major device numbers remapping
302  */
303 dev_t
304 linux_fakedev(dev_t dev, int raw)
305 {
306 	/* XXX write me */
307 	return dev;
308 }
309 
310 /*
311  * We come here in a last attempt to satisfy a Linux ioctl() call
312  */
313 int
314 linux_machdepioctl(struct lwp *l, const struct linux_sys_ioctl_args *uap, register_t *retval)
315 {
316 	return 0;
317 }
318 
319 /*
320  * See above. If a root process tries to set access to an I/O port,
321  * just let it have the whole range.
322  */
323 int
324 linux_sys_ioperm(struct lwp *l, const struct linux_sys_ioperm_args *uap, register_t *retval)
325 {
326 	/*
327 	 * This syscall is not implemented in Linux/Mips: we should not be here
328 	 */
329 #ifdef DEBUG_LINUX
330 	printf("linux_sys_ioperm: should not be here.\n");
331 #endif /* DEBUG_LINUX */
332 	return 0;
333 }
334 
335 /*
336  * wrapper linux_sys_new_uname() -> linux_sys_uname()
337  */
338 int
339 linux_sys_new_uname(struct lwp *l, const struct linux_sys_new_uname_args *uap, register_t *retval)
340 {
341 /*
342  * Use this if you want to try Linux emulation with a glibc-2.2
343  * or higher. Note that signals will not work
344  */
345 #if 0
346         struct linux_sys_uname_args /* {
347                 syscallarg(struct linux_utsname *) up;
348         } */ *uap = v;
349         struct linux_utsname luts;
350 
351         strlcpy(luts.l_sysname, linux_sysname, sizeof(luts.l_sysname));
352         strlcpy(luts.l_nodename, hostname, sizeof(luts.l_nodename));
353         strlcpy(luts.l_release, "2.4.0", sizeof(luts.l_release));
354         strlcpy(luts.l_version, linux_version, sizeof(luts.l_version));
355         strlcpy(luts.l_machine, machine, sizeof(luts.l_machine));
356         strlcpy(luts.l_domainname, domainname, sizeof(luts.l_domainname));
357 
358         return copyout(&luts, SCARG(uap, up), sizeof(luts));
359 #else
360 	return linux_sys_uname(l, (const void *)uap, retval);
361 #endif
362 }
363 
364 /*
365  * In Linux, cacheflush is currently implemented
366  * as a whole cache flush (arguments are ignored)
367  * we emulate this broken beahior.
368  */
369 int
370 linux_sys_cacheflush(struct lwp *l, const struct linux_sys_cacheflush_args *uap, register_t *retval)
371 {
372 	mips_icache_sync_all();
373 	mips_dcache_wbinv_all();
374 	return 0;
375 }
376 
377 /*
378  * This system call is depecated in Linux, but
379  * some binaries and some libraries use it.
380  */
381 int
382 linux_sys_sysmips(struct lwp *l, const struct linux_sys_sysmips_args *uap, register_t *retval)
383 {
384 	/* {
385 		syscallarg(int) cmd;
386 		syscallarg(int) arg1;
387 		syscallarg(int) arg2;
388 		syscallarg(int) arg3;
389 	} */
390 	int error;
391 
392 	switch (SCARG(uap, cmd)) {
393 	case LINUX_SETNAME: {
394 		char nodename [LINUX___NEW_UTS_LEN + 1];
395 		int name[2];
396 		size_t len;
397 
398 		if ((error = copyinstr((char *)SCARG(uap, arg1), nodename,
399 		    LINUX___NEW_UTS_LEN, &len)) != 0)
400 			return error;
401 
402 		name[0] = CTL_KERN;
403 		name[1] = KERN_HOSTNAME;
404 		return (old_sysctl(&name[0], 2, 0, 0, nodename, len, NULL));
405 
406 		break;
407 	}
408 	case LINUX_MIPS_ATOMIC_SET: {
409 		void *addr;
410 		int s;
411 		u_int8_t value = 0;
412 
413 		addr = (void *)SCARG(uap, arg1);
414 
415 		s = splhigh();
416 		/*
417 		 * No error testing here. This is bad, but Linux does
418 		 * it like this. The source aknowledge "This is broken"
419 		 * in a comment...
420 		 */
421 		(void) copyin(addr, &value, 1);
422 		*retval = value;
423 		value = (u_int8_t) SCARG(uap, arg2);
424 		error = copyout(&value, addr, 1);
425 		splx(s);
426 
427 		return 0;
428 		break;
429 	}
430 	case LINUX_MIPS_FIXADE:		/* XXX not implemented */
431 		break;
432 	case LINUX_FLUSH_CACHE:
433 		mips_icache_sync_all();
434 		mips_dcache_wbinv_all();
435 		break;
436 	case LINUX_MIPS_RDNVRAM:
437 		return EIO;
438 		break;
439 	default:
440 		return EINVAL;
441 		break;
442 	}
443 #ifdef DEBUG_LINUX
444 	printf("linux_sys_sysmips(): unimplemented command %d\n",
445 	    SCARG(uap,cmd));
446 #endif /* DEBUG_LINUX */
447 	return 0;
448 }
449 
450 int
451 linux_usertrap(struct lwp *l, vaddr_t trapaddr, void *arg)
452 {
453 	return 0;
454 }
455 
456 int
457 linux_sys_set_thread_area(struct lwp *l, const struct linux_sys_set_thread_area_args *uap, register_t *retval)
458 {
459 	/* {
460 		syscallarg(void *) tls;
461 	} */
462 
463 	return lwp_setprivate(l, SCARG(uap, tls));
464 }
465