linux_machdep.c revision 1.36
1 /* $NetBSD: linux_machdep.c,v 1.36 2007/02/09 21:55:18 ad Exp $ */ 2 3 /*- 4 * Copyright (c) 1998 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Eric Haszlakiewicz. 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 * 3. All advertising materials mentioning features or use of this software 19 * must display the following acknowledgement: 20 * This product includes software developed by the NetBSD 21 * Foundation, Inc. and its contributors. 22 * 4. Neither the name of The NetBSD Foundation nor the names of its 23 * contributors may be used to endorse or promote products derived 24 * from this software without specific prior written permission. 25 * 26 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 27 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 28 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 29 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 30 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 31 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 32 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 33 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 34 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 35 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 36 * POSSIBILITY OF SUCH DAMAGE. 37 * 38 * Based on sys/arch/i386/i386/linux_machdep.c: 39 * linux_machdep.c,v 1.42 1998/09/11 12:50:06 mycroft Exp 40 * written by Frank van der Linden 41 * 42 */ 43 44 #include <sys/cdefs.h> 45 __KERNEL_RCSID(0, "$NetBSD: linux_machdep.c,v 1.36 2007/02/09 21:55:18 ad Exp $"); 46 47 #include <sys/param.h> 48 #include <sys/systm.h> 49 #include <sys/signalvar.h> 50 #include <sys/kernel.h> 51 #include <sys/proc.h> 52 #include <sys/user.h> 53 #include <sys/buf.h> 54 #include <sys/reboot.h> 55 #include <sys/conf.h> 56 #include <sys/exec.h> 57 #include <sys/file.h> 58 #include <sys/callout.h> 59 #include <sys/malloc.h> 60 #include <sys/mbuf.h> 61 #include <sys/msgbuf.h> 62 #include <sys/mount.h> 63 #include <sys/vnode.h> 64 #include <sys/device.h> 65 #include <sys/syscallargs.h> 66 #include <sys/filedesc.h> 67 #include <sys/exec_elf.h> 68 #include <sys/ioctl.h> 69 #include <sys/kauth.h> 70 71 #include <uvm/uvm_extern.h> 72 73 #include <compat/linux/common/linux_types.h> 74 #include <compat/linux/common/linux_signal.h> 75 #include <compat/linux/common/linux_siginfo.h> 76 #include <compat/linux/common/linux_util.h> 77 #include <compat/linux/common/linux_ioctl.h> 78 #include <compat/linux/common/linux_exec.h> 79 #include <compat/linux/common/linux_machdep.h> 80 #include <compat/linux/common/linux_emuldata.h> 81 82 #include <compat/linux/linux_syscallargs.h> 83 84 #include <machine/alpha.h> 85 #include <machine/reg.h> 86 87 #if defined(_KERNEL_OPT) 88 #include "wsdisplay.h" 89 #endif 90 #if (NWSDISPLAY >0) 91 #include <dev/wscons/wsdisplay_usl_io.h> 92 #endif 93 #ifdef DEBUG 94 #include <machine/sigdebug.h> 95 #endif 96 97 /* 98 * Deal with some alpha-specific things in the Linux emulation code. 99 */ 100 101 void 102 linux_setregs(l, epp, stack) 103 struct lwp *l; 104 struct exec_package *epp; 105 u_long stack; 106 { 107 #ifdef DEBUG 108 struct trapframe *tfp = l->l_md.md_tf; 109 #endif 110 111 setregs(l, epp, stack); 112 #ifdef DEBUG 113 /* 114 * Linux has registers set to zero on entry; for DEBUG kernels 115 * the alpha setregs() fills registers with 0xbabefacedeadbeef. 116 */ 117 memset(tfp->tf_regs, 0, FRAME_SIZE * sizeof tfp->tf_regs[0]); 118 #endif 119 } 120 121 void 122 setup_linux_rt_sigframe(struct trapframe *tf, int sig, const sigset_t *mask) 123 { 124 struct lwp *l = curlwp; 125 struct proc *p = l->l_proc; 126 struct linux_rt_sigframe *sfp, sigframe; 127 int onstack, error; 128 int fsize, rndfsize; 129 extern char linux_rt_sigcode[], linux_rt_esigcode[]; 130 131 /* Do we need to jump onto the signal stack? */ 132 onstack = (l->l_sigstk.ss_flags & (SS_DISABLE | SS_ONSTACK)) == 0 && 133 (SIGACTION(p, sig).sa_flags & SA_ONSTACK) != 0; 134 135 /* Allocate space for the signal handler context. */ 136 fsize = sizeof(struct linux_rt_sigframe); 137 rndfsize = ((fsize + 15) / 16) * 16; 138 139 if (onstack) 140 sfp = (struct linux_rt_sigframe *) 141 ((caddr_t)l->l_sigstk.ss_sp + 142 l->l_sigstk.ss_size); 143 else 144 sfp = (struct linux_rt_sigframe *)(alpha_pal_rdusp()); 145 sfp = (struct linux_rt_sigframe *)((caddr_t)sfp - rndfsize); 146 147 #ifdef DEBUG 148 if ((sigdebug & SDB_KSTACK) && (p->p_pid == sigpid)) 149 printf("linux_sendsig(%d): sig %d ssp %p usp %p\n", p->p_pid, 150 sig, &onstack, sfp); 151 #endif /* DEBUG */ 152 153 /* 154 * Build the signal context to be used by sigreturn. 155 */ 156 memset(&sigframe.uc, 0, sizeof(struct linux_ucontext)); 157 sigframe.uc.uc_mcontext.sc_onstack = onstack; 158 159 /* Setup potentially partial signal mask in sc_mask. */ 160 /* But get all of it in uc_sigmask */ 161 native_to_linux_old_sigset(&sigframe.uc.uc_mcontext.sc_mask, mask); 162 native_to_linux_sigset(&sigframe.uc.uc_sigmask, mask); 163 164 sigframe.uc.uc_mcontext.sc_pc = tf->tf_regs[FRAME_PC]; 165 sigframe.uc.uc_mcontext.sc_ps = ALPHA_PSL_USERMODE; 166 frametoreg(tf, (struct reg *)sigframe.uc.uc_mcontext.sc_regs); 167 sigframe.uc.uc_mcontext.sc_regs[R_SP] = alpha_pal_rdusp(); 168 169 alpha_enable_fp(l, 1); 170 sigframe.uc.uc_mcontext.sc_fpcr = alpha_read_fpcr(); 171 sigframe.uc.uc_mcontext.sc_fp_control = alpha_read_fp_c(l); 172 alpha_pal_wrfen(0); 173 174 sigframe.uc.uc_mcontext.sc_traparg_a0 = tf->tf_regs[FRAME_A0]; 175 sigframe.uc.uc_mcontext.sc_traparg_a1 = tf->tf_regs[FRAME_A1]; 176 sigframe.uc.uc_mcontext.sc_traparg_a2 = tf->tf_regs[FRAME_A2]; 177 178 /* 179 * XXX XAX Create bogus siginfo data. This can't really 180 * XXX be fixed until NetBSD has realtime signals. 181 * XXX Or we do the emuldata thing. 182 * XXX -erh 183 */ 184 memset(&sigframe.info, 0, sizeof(struct linux_siginfo)); 185 sigframe.info.lsi_signo = sig; 186 sigframe.info.lsi_code = LINUX_SI_USER; 187 sigframe.info.lsi_pid = p->p_pid; 188 sigframe.info.lsi_uid = kauth_cred_geteuid(l->l_cred); /* Use real uid here? */ 189 190 sendsig_reset(l, sig); 191 mutex_exit(&p->p_smutex); 192 error = copyout((caddr_t)&sigframe, (caddr_t)sfp, fsize); 193 mutex_enter(&p->p_smutex); 194 195 if (error != 0) { 196 #ifdef DEBUG 197 if ((sigdebug & SDB_KSTACK) && p->p_pid == sigpid) 198 printf("sendsig(%d): copyout failed on sig %d\n", 199 p->p_pid, sig); 200 #endif 201 /* 202 * Process has trashed its stack; give it an illegal 203 * instruction to halt it in its tracks. 204 */ 205 sigexit(l, SIGILL); 206 /* NOTREACHED */ 207 } 208 209 /* Pass pointers to siginfo and ucontext in the regs */ 210 tf->tf_regs[FRAME_A1] = (unsigned long)&sfp->info; 211 tf->tf_regs[FRAME_A2] = (unsigned long)&sfp->uc; 212 213 /* Address of trampoline code. End up at this PC after mi_switch */ 214 tf->tf_regs[FRAME_PC] = 215 (u_int64_t)(p->p_psstr - (linux_rt_esigcode - linux_rt_sigcode)); 216 217 /* Adjust the stack */ 218 alpha_pal_wrusp((unsigned long)sfp); 219 220 /* Remember that we're now on the signal stack. */ 221 if (onstack) 222 l->l_sigstk.ss_flags |= SS_ONSTACK; 223 } 224 225 void setup_linux_sigframe(tf, sig, mask) 226 struct trapframe *tf; 227 int sig; 228 const sigset_t *mask; 229 { 230 struct lwp *l = curlwp; 231 struct proc *p = l->l_proc; 232 struct linux_sigframe *sfp, sigframe; 233 int onstack, error; 234 int fsize, rndfsize; 235 extern char linux_sigcode[], linux_esigcode[]; 236 237 /* Do we need to jump onto the signal stack? */ 238 onstack = (l->l_sigstk.ss_flags & (SS_DISABLE | SS_ONSTACK)) == 0 && 239 (SIGACTION(p, sig).sa_flags & SA_ONSTACK) != 0; 240 241 /* Allocate space for the signal handler context. */ 242 fsize = sizeof(struct linux_sigframe); 243 rndfsize = ((fsize + 15) / 16) * 16; 244 245 if (onstack) 246 sfp = (struct linux_sigframe *) 247 ((caddr_t)l->l_sigstk.ss_sp + 248 l->l_sigstk.ss_size); 249 else 250 sfp = (struct linux_sigframe *)(alpha_pal_rdusp()); 251 sfp = (struct linux_sigframe *)((caddr_t)sfp - rndfsize); 252 253 #ifdef DEBUG 254 if ((sigdebug & SDB_KSTACK) && (p->p_pid == sigpid)) 255 printf("linux_sendsig(%d): sig %d ssp %p usp %p\n", p->p_pid, 256 sig, &onstack, sfp); 257 #endif /* DEBUG */ 258 259 /* 260 * Build the signal context to be used by sigreturn. 261 */ 262 memset(&sigframe.sf_sc, 0, sizeof(struct linux_ucontext)); 263 sigframe.sf_sc.sc_onstack = onstack; 264 native_to_linux_old_sigset(&sigframe.sf_sc.sc_mask, mask); 265 sigframe.sf_sc.sc_pc = tf->tf_regs[FRAME_PC]; 266 sigframe.sf_sc.sc_ps = ALPHA_PSL_USERMODE; 267 frametoreg(tf, (struct reg *)sigframe.sf_sc.sc_regs); 268 sigframe.sf_sc.sc_regs[R_SP] = alpha_pal_rdusp(); 269 270 if (l == fpcurlwp) { 271 alpha_pal_wrfen(1); 272 savefpstate(&l->l_addr->u_pcb.pcb_fp); 273 alpha_pal_wrfen(0); 274 sigframe.sf_sc.sc_fpcr = l->l_addr->u_pcb.pcb_fp.fpr_cr; 275 fpcurlwp = NULL; 276 } 277 /* XXX ownedfp ? etc...? */ 278 279 sigframe.sf_sc.sc_traparg_a0 = tf->tf_regs[FRAME_A0]; 280 sigframe.sf_sc.sc_traparg_a1 = tf->tf_regs[FRAME_A1]; 281 sigframe.sf_sc.sc_traparg_a2 = tf->tf_regs[FRAME_A2]; 282 283 sendsig_reset(l, sig); 284 mutex_exit(&p->p_smutex); 285 error = copyout((caddr_t)&sigframe, (caddr_t)sfp, fsize); 286 mutex_enter(&p->p_smutex); 287 288 if (error != 0) { 289 #ifdef DEBUG 290 if ((sigdebug & SDB_KSTACK) && p->p_pid == sigpid) 291 printf("sendsig(%d): copyout failed on sig %d\n", 292 p->p_pid, sig); 293 #endif 294 /* 295 * Process has trashed its stack; give it an illegal 296 * instruction to halt it in its tracks. 297 */ 298 sigexit(l, SIGILL); 299 /* NOTREACHED */ 300 } 301 302 /* Pass pointers to sigcontext in the regs */ 303 tf->tf_regs[FRAME_A1] = 0; 304 tf->tf_regs[FRAME_A2] = (unsigned long)&sfp->sf_sc; 305 306 /* Address of trampoline code. End up at this PC after mi_switch */ 307 tf->tf_regs[FRAME_PC] = 308 (u_int64_t)(p->p_psstr - (linux_esigcode - linux_sigcode)); 309 310 /* Adjust the stack */ 311 alpha_pal_wrusp((unsigned long)sfp); 312 313 /* Remember that we're now on the signal stack. */ 314 if (onstack) 315 l->l_sigstk.ss_flags |= SS_ONSTACK; 316 } 317 318 /* 319 * Send an interrupt to process. 320 * 321 * Stack is set up to allow sigcode stored 322 * in u. to call routine, followed by kcall 323 * to sigreturn routine below. After sigreturn 324 * resets the signal mask, the stack, and the 325 * frame pointer, it returns to the user 326 * specified pc, psl. 327 */ 328 void 329 linux_sendsig(const ksiginfo_t *ksi, const sigset_t *mask) 330 { 331 struct lwp *l = curlwp; 332 struct proc *p = l->l_proc; 333 struct trapframe *tf = l->l_md.md_tf; 334 const int sig = ksi->ksi_signo; 335 sig_t catcher = SIGACTION(p, sig).sa_handler; 336 #ifdef notyet 337 struct linux_emuldata *edp; 338 339 /* Setup the signal frame (and part of the trapframe) */ 340 /*OLD: if (p->p_sigacts->ps_siginfo & sigmask(sig))*/ 341 /* XXX XAX this is broken now. need someplace to store what 342 XXX XAX kind of signal handler a signal has.*/ 343 #if 0 344 edp = (struct linux_emuldata *)p->p_emuldata; 345 #else 346 edp = 0; 347 #endif 348 if (edp && sigismember(&edp->ps_siginfo, sig)) 349 setup_linux_rt_sigframe(tf, sig, mask); 350 else 351 #endif /* notyet */ 352 setup_linux_sigframe(tf, sig, mask); 353 354 /* Signal handler for trampoline code */ 355 tf->tf_regs[FRAME_T12] = (u_int64_t)catcher; 356 tf->tf_regs[FRAME_A0] = native_to_linux_signo[sig]; 357 358 /* 359 * Linux has a custom restorer option. To support it we would 360 * need to store an array of restorers and a sigcode block 361 * which knew to use it. Doesn't seem worth the trouble. 362 * -erh 363 */ 364 365 #ifdef DEBUG 366 if (sigdebug & SDB_FOLLOW) 367 printf("sendsig(%d): pc %lx, catcher %lx\n", l->l_proc->p_pid, 368 tf->tf_regs[FRAME_PC], tf->tf_regs[FRAME_A3]); 369 if ((sigdebug & SDB_KSTACK) && l->l_proc->p_pid == sigpid) 370 printf("sendsig(%d): sig %d returns\n", l->l_proc->p_pid, sig); 371 #endif 372 } 373 374 /* 375 * System call to cleanup state after a signal 376 * has been taken. Reset signal mask and 377 * stack state from context left by sendsig (above). 378 * Return to previous pc as specified by context 379 * left by sendsig. 380 * Linux real-time signals use a different sigframe, 381 * but the sigcontext is the same. 382 */ 383 384 int 385 linux_restore_sigcontext(struct lwp *l, struct linux_sigcontext context, 386 sigset_t *mask) 387 { 388 struct proc *p = l->l_proc; 389 390 /* 391 * Linux doesn't (yet) have alternate signal stacks. 392 * However, the OSF/1 sigcontext which they use has 393 * an onstack member. This could be needed in the future. 394 */ 395 mutex_enter(&p->p_smutex); 396 if (context.sc_onstack & LINUX_SA_ONSTACK) 397 l->l_sigstk.ss_flags |= SS_ONSTACK; 398 else 399 l->l_sigstk.ss_flags &= ~SS_ONSTACK; 400 401 /* Reset the signal mask */ 402 (void) sigprocmask1(l, SIG_SETMASK, mask, 0); 403 mutex_exit(&p->p_smutex); 404 405 /* 406 * Check for security violations. 407 * Linux doesn't allow any changes to the PSL. 408 */ 409 if (context.sc_ps != ALPHA_PSL_USERMODE) 410 return(EINVAL); 411 412 l->l_md.md_tf->tf_regs[FRAME_PC] = context.sc_pc; 413 l->l_md.md_tf->tf_regs[FRAME_PS] = context.sc_ps; 414 415 regtoframe((struct reg *)context.sc_regs, l->l_md.md_tf); 416 alpha_pal_wrusp(context.sc_regs[R_SP]); 417 418 if (l == fpcurlwp) 419 fpcurlwp = NULL; 420 421 /* Restore fp regs and fpr_cr */ 422 bcopy((struct fpreg *)context.sc_fpregs, &l->l_addr->u_pcb.pcb_fp, 423 sizeof(struct fpreg)); 424 /* XXX sc_ownedfp ? */ 425 /* XXX sc_fp_control ? */ 426 427 #ifdef DEBUG 428 if (sigdebug & SDB_FOLLOW) 429 printf("linux_rt_sigreturn(%d): returns\n", p->p_pid); 430 #endif 431 return (EJUSTRETURN); 432 } 433 434 int 435 linux_sys_rt_sigreturn(l, v, retval) 436 struct lwp *l; 437 void *v; 438 register_t *retval; 439 { 440 struct linux_sys_rt_sigreturn_args /* { 441 syscallarg(struct linux_rt_sigframe *) sfp; 442 } */ *uap = v; 443 struct linux_rt_sigframe *sfp, sigframe; 444 sigset_t mask; 445 446 /* 447 * The trampoline code hands us the context. 448 * It is unsafe to keep track of it ourselves, in the event that a 449 * program jumps out of a signal handler. 450 */ 451 452 sfp = SCARG(uap, sfp); 453 454 if (ALIGN(sfp) != (u_int64_t)sfp) 455 return(EINVAL); 456 457 /* 458 * Fetch the frame structure. 459 */ 460 if (copyin((caddr_t)sfp, &sigframe, 461 sizeof(struct linux_rt_sigframe)) != 0) 462 return (EFAULT); 463 464 /* Grab the signal mask */ 465 linux_to_native_sigset(&mask, &sigframe.uc.uc_sigmask); 466 467 return(linux_restore_sigcontext(l, sigframe.uc.uc_mcontext, &mask)); 468 } 469 470 471 int 472 linux_sys_sigreturn(l, v, retval) 473 struct lwp *l; 474 void *v; 475 register_t *retval; 476 { 477 struct linux_sys_sigreturn_args /* { 478 syscallarg(struct linux_sigframe *) sfp; 479 } */ *uap = v; 480 struct linux_sigframe *sfp, frame; 481 sigset_t mask; 482 483 /* 484 * The trampoline code hands us the context. 485 * It is unsafe to keep track of it ourselves, in the event that a 486 * program jumps out of a signal handler. 487 */ 488 489 sfp = SCARG(uap, sfp); 490 if (ALIGN(sfp) != (u_int64_t)sfp) 491 return(EINVAL); 492 493 /* 494 * Fetch the frame structure. 495 */ 496 if (copyin((caddr_t)sfp, &frame, sizeof(struct linux_sigframe)) != 0) 497 return(EFAULT); 498 499 /* Grab the signal mask. */ 500 /* XXX use frame.extramask */ 501 linux_old_to_native_sigset(&mask, frame.sf_sc.sc_mask); 502 503 return(linux_restore_sigcontext(l, frame.sf_sc, &mask)); 504 } 505 506 /* 507 * We come here in a last attempt to satisfy a Linux ioctl() call 508 */ 509 /* XXX XAX update this, add maps, etc... */ 510 int 511 linux_machdepioctl(l, v, retval) 512 struct lwp *l; 513 void *v; 514 register_t *retval; 515 { 516 struct linux_sys_ioctl_args /* { 517 syscallarg(int) fd; 518 syscallarg(u_long) com; 519 syscallarg(caddr_t) data; 520 } */ *uap = v; 521 struct sys_ioctl_args bia; 522 u_long com; 523 524 SCARG(&bia, fd) = SCARG(uap, fd); 525 SCARG(&bia, data) = SCARG(uap, data); 526 com = SCARG(uap, com); 527 528 switch (com) { 529 default: 530 printf("linux_machdepioctl: invalid ioctl %08lx\n", com); 531 return EINVAL; 532 } 533 SCARG(&bia, com) = com; 534 return sys_ioctl(l, &bia, retval); 535 } 536 537 /* XXX XAX fix this */ 538 dev_t 539 linux_fakedev(dev, raw) 540 dev_t dev; 541 int raw; 542 { 543 return dev; 544 } 545 546 int 547 linux_usertrap(struct lwp *l, vaddr_t trapaddr, void *arg) 548 { 549 return 0; 550 } 551
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