linux_machdep.c revision 1.38.2.1
1 /* $NetBSD: linux_machdep.c,v 1.38.2.1 2007/07/15 13:27:07 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 1.38.2.1 2007/07/15 13:27:07 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 ((char *)l->l_sigstk.ss_sp + l->l_sigstk.ss_size); 142 else 143 sfp = (struct linux_rt_sigframe *)(alpha_pal_rdusp()); 144 sfp = (struct linux_rt_sigframe *)((char *)sfp - rndfsize); 145 146 #ifdef DEBUG 147 if ((sigdebug & SDB_KSTACK) && (p->p_pid == sigpid)) 148 printf("linux_sendsig(%d): sig %d ssp %p usp %p\n", p->p_pid, 149 sig, &onstack, sfp); 150 #endif /* DEBUG */ 151 152 /* 153 * Build the signal context to be used by sigreturn. 154 */ 155 memset(&sigframe.uc, 0, sizeof(struct linux_ucontext)); 156 sigframe.uc.uc_mcontext.sc_onstack = onstack; 157 158 /* Setup potentially partial signal mask in sc_mask. */ 159 /* But get all of it in uc_sigmask */ 160 native_to_linux_old_sigset(&sigframe.uc.uc_mcontext.sc_mask, mask); 161 native_to_linux_sigset(&sigframe.uc.uc_sigmask, mask); 162 163 sigframe.uc.uc_mcontext.sc_pc = tf->tf_regs[FRAME_PC]; 164 sigframe.uc.uc_mcontext.sc_ps = ALPHA_PSL_USERMODE; 165 frametoreg(tf, (struct reg *)sigframe.uc.uc_mcontext.sc_regs); 166 sigframe.uc.uc_mcontext.sc_regs[R_SP] = alpha_pal_rdusp(); 167 168 alpha_enable_fp(l, 1); 169 sigframe.uc.uc_mcontext.sc_fpcr = alpha_read_fpcr(); 170 sigframe.uc.uc_mcontext.sc_fp_control = alpha_read_fp_c(l); 171 alpha_pal_wrfen(0); 172 173 sigframe.uc.uc_mcontext.sc_traparg_a0 = tf->tf_regs[FRAME_A0]; 174 sigframe.uc.uc_mcontext.sc_traparg_a1 = tf->tf_regs[FRAME_A1]; 175 sigframe.uc.uc_mcontext.sc_traparg_a2 = tf->tf_regs[FRAME_A2]; 176 177 /* 178 * XXX XAX Create bogus siginfo data. This can't really 179 * XXX be fixed until NetBSD has realtime signals. 180 * XXX Or we do the emuldata thing. 181 * XXX -erh 182 */ 183 memset(&sigframe.info, 0, sizeof(struct linux_siginfo)); 184 sigframe.info.lsi_signo = sig; 185 sigframe.info.lsi_code = LINUX_SI_USER; 186 sigframe.info.lsi_pid = p->p_pid; 187 sigframe.info.lsi_uid = kauth_cred_geteuid(l->l_cred); /* Use real uid here? */ 188 189 sendsig_reset(l, sig); 190 mutex_exit(&p->p_smutex); 191 error = copyout((void *)&sigframe, (void *)sfp, fsize); 192 mutex_enter(&p->p_smutex); 193 194 if (error != 0) { 195 #ifdef DEBUG 196 if ((sigdebug & SDB_KSTACK) && p->p_pid == sigpid) 197 printf("sendsig(%d): copyout failed on sig %d\n", 198 p->p_pid, sig); 199 #endif 200 /* 201 * Process has trashed its stack; give it an illegal 202 * instruction to halt it in its tracks. 203 */ 204 sigexit(l, SIGILL); 205 /* NOTREACHED */ 206 } 207 208 /* Pass pointers to siginfo and ucontext in the regs */ 209 tf->tf_regs[FRAME_A1] = (unsigned long)&sfp->info; 210 tf->tf_regs[FRAME_A2] = (unsigned long)&sfp->uc; 211 212 /* Address of trampoline code. End up at this PC after mi_switch */ 213 tf->tf_regs[FRAME_PC] = 214 (u_int64_t)(p->p_psstr - (linux_rt_esigcode - linux_rt_sigcode)); 215 216 /* Adjust the stack */ 217 alpha_pal_wrusp((unsigned long)sfp); 218 219 /* Remember that we're now on the signal stack. */ 220 if (onstack) 221 l->l_sigstk.ss_flags |= SS_ONSTACK; 222 } 223 224 void setup_linux_sigframe(tf, sig, mask) 225 struct trapframe *tf; 226 int sig; 227 const sigset_t *mask; 228 { 229 struct lwp *l = curlwp; 230 struct proc *p = l->l_proc; 231 struct linux_sigframe *sfp, sigframe; 232 int onstack, error; 233 int fsize, rndfsize; 234 extern char linux_sigcode[], linux_esigcode[]; 235 236 /* Do we need to jump onto the signal stack? */ 237 onstack = (l->l_sigstk.ss_flags & (SS_DISABLE | SS_ONSTACK)) == 0 && 238 (SIGACTION(p, sig).sa_flags & SA_ONSTACK) != 0; 239 240 /* Allocate space for the signal handler context. */ 241 fsize = sizeof(struct linux_sigframe); 242 rndfsize = ((fsize + 15) / 16) * 16; 243 244 if (onstack) 245 sfp = (struct linux_sigframe *) 246 ((char *)l->l_sigstk.ss_sp + l->l_sigstk.ss_size); 247 else 248 sfp = (struct linux_sigframe *)(alpha_pal_rdusp()); 249 sfp = (struct linux_sigframe *)((char *)sfp - rndfsize); 250 251 #ifdef DEBUG 252 if ((sigdebug & SDB_KSTACK) && (p->p_pid == sigpid)) 253 printf("linux_sendsig(%d): sig %d ssp %p usp %p\n", p->p_pid, 254 sig, &onstack, sfp); 255 #endif /* DEBUG */ 256 257 /* 258 * Build the signal context to be used by sigreturn. 259 */ 260 memset(&sigframe.sf_sc, 0, sizeof(struct linux_sigcontext)); 261 sigframe.sf_sc.sc_onstack = onstack; 262 native_to_linux_old_sigset(&sigframe.sf_sc.sc_mask, mask); 263 sigframe.sf_sc.sc_pc = tf->tf_regs[FRAME_PC]; 264 sigframe.sf_sc.sc_ps = ALPHA_PSL_USERMODE; 265 frametoreg(tf, (struct reg *)sigframe.sf_sc.sc_regs); 266 sigframe.sf_sc.sc_regs[R_SP] = alpha_pal_rdusp(); 267 268 if (l == fpcurlwp) { 269 alpha_pal_wrfen(1); 270 savefpstate(&l->l_addr->u_pcb.pcb_fp); 271 alpha_pal_wrfen(0); 272 sigframe.sf_sc.sc_fpcr = l->l_addr->u_pcb.pcb_fp.fpr_cr; 273 fpcurlwp = NULL; 274 } 275 /* XXX ownedfp ? etc...? */ 276 277 sigframe.sf_sc.sc_traparg_a0 = tf->tf_regs[FRAME_A0]; 278 sigframe.sf_sc.sc_traparg_a1 = tf->tf_regs[FRAME_A1]; 279 sigframe.sf_sc.sc_traparg_a2 = tf->tf_regs[FRAME_A2]; 280 281 sendsig_reset(l, sig); 282 mutex_exit(&p->p_smutex); 283 error = copyout((void *)&sigframe, (void *)sfp, fsize); 284 mutex_enter(&p->p_smutex); 285 286 if (error != 0) { 287 #ifdef DEBUG 288 if ((sigdebug & SDB_KSTACK) && p->p_pid == sigpid) 289 printf("sendsig(%d): copyout failed on sig %d\n", 290 p->p_pid, sig); 291 #endif 292 /* 293 * Process has trashed its stack; give it an illegal 294 * instruction to halt it in its tracks. 295 */ 296 sigexit(l, SIGILL); 297 /* NOTREACHED */ 298 } 299 300 /* Pass pointers to sigcontext in the regs */ 301 tf->tf_regs[FRAME_A1] = 0; 302 tf->tf_regs[FRAME_A2] = (unsigned long)&sfp->sf_sc; 303 304 /* Address of trampoline code. End up at this PC after mi_switch */ 305 tf->tf_regs[FRAME_PC] = 306 (u_int64_t)(p->p_psstr - (linux_esigcode - linux_sigcode)); 307 308 /* Adjust the stack */ 309 alpha_pal_wrusp((unsigned long)sfp); 310 311 /* Remember that we're now on the signal stack. */ 312 if (onstack) 313 l->l_sigstk.ss_flags |= SS_ONSTACK; 314 } 315 316 /* 317 * Send an interrupt to process. 318 * 319 * Stack is set up to allow sigcode stored 320 * in u. to call routine, followed by kcall 321 * to sigreturn routine below. After sigreturn 322 * resets the signal mask, the stack, and the 323 * frame pointer, it returns to the user 324 * specified pc, psl. 325 */ 326 void 327 linux_sendsig(const ksiginfo_t *ksi, const sigset_t *mask) 328 { 329 struct lwp *l = curlwp; 330 struct proc *p = l->l_proc; 331 struct trapframe *tf = l->l_md.md_tf; 332 const int sig = ksi->ksi_signo; 333 sig_t catcher = SIGACTION(p, sig).sa_handler; 334 #ifdef notyet 335 struct linux_emuldata *edp; 336 337 /* Setup the signal frame (and part of the trapframe) */ 338 /*OLD: if (p->p_sigacts->ps_siginfo & sigmask(sig))*/ 339 /* XXX XAX this is broken now. need someplace to store what 340 XXX XAX kind of signal handler a signal has.*/ 341 #if 0 342 edp = (struct linux_emuldata *)p->p_emuldata; 343 #else 344 edp = 0; 345 #endif 346 if (edp && sigismember(&edp->ps_siginfo, sig)) 347 setup_linux_rt_sigframe(tf, sig, mask); 348 else 349 #endif /* notyet */ 350 setup_linux_sigframe(tf, sig, mask); 351 352 /* Signal handler for trampoline code */ 353 tf->tf_regs[FRAME_T12] = (u_int64_t)catcher; 354 tf->tf_regs[FRAME_A0] = native_to_linux_signo[sig]; 355 356 /* 357 * Linux has a custom restorer option. To support it we would 358 * need to store an array of restorers and a sigcode block 359 * which knew to use it. Doesn't seem worth the trouble. 360 * -erh 361 */ 362 363 #ifdef DEBUG 364 if (sigdebug & SDB_FOLLOW) 365 printf("sendsig(%d): pc %lx, catcher %lx\n", l->l_proc->p_pid, 366 tf->tf_regs[FRAME_PC], tf->tf_regs[FRAME_A3]); 367 if ((sigdebug & SDB_KSTACK) && l->l_proc->p_pid == sigpid) 368 printf("sendsig(%d): sig %d returns\n", l->l_proc->p_pid, sig); 369 #endif 370 } 371 372 /* 373 * System call to cleanup state after a signal 374 * has been taken. Reset signal mask and 375 * stack state from context left by sendsig (above). 376 * Return to previous pc as specified by context 377 * left by sendsig. 378 * Linux real-time signals use a different sigframe, 379 * but the sigcontext is the same. 380 */ 381 382 int 383 linux_restore_sigcontext(struct lwp *l, struct linux_sigcontext context, 384 sigset_t *mask) 385 { 386 struct proc *p = l->l_proc; 387 388 /* 389 * Linux doesn't (yet) have alternate signal stacks. 390 * However, the OSF/1 sigcontext which they use has 391 * an onstack member. This could be needed in the future. 392 */ 393 mutex_enter(&p->p_smutex); 394 if (context.sc_onstack & LINUX_SA_ONSTACK) 395 l->l_sigstk.ss_flags |= SS_ONSTACK; 396 else 397 l->l_sigstk.ss_flags &= ~SS_ONSTACK; 398 399 /* Reset the signal mask */ 400 (void) sigprocmask1(l, SIG_SETMASK, mask, 0); 401 mutex_exit(&p->p_smutex); 402 403 /* 404 * Check for security violations. 405 * Linux doesn't allow any changes to the PSL. 406 */ 407 if (context.sc_ps != ALPHA_PSL_USERMODE) 408 return(EINVAL); 409 410 l->l_md.md_tf->tf_regs[FRAME_PC] = context.sc_pc; 411 l->l_md.md_tf->tf_regs[FRAME_PS] = context.sc_ps; 412 413 regtoframe((struct reg *)context.sc_regs, l->l_md.md_tf); 414 alpha_pal_wrusp(context.sc_regs[R_SP]); 415 416 if (l == fpcurlwp) 417 fpcurlwp = NULL; 418 419 /* Restore fp regs and fpr_cr */ 420 bcopy((struct fpreg *)context.sc_fpregs, &l->l_addr->u_pcb.pcb_fp, 421 sizeof(struct fpreg)); 422 /* XXX sc_ownedfp ? */ 423 /* XXX sc_fp_control ? */ 424 425 #ifdef DEBUG 426 if (sigdebug & SDB_FOLLOW) 427 printf("linux_rt_sigreturn(%d): returns\n", p->p_pid); 428 #endif 429 return (EJUSTRETURN); 430 } 431 432 int 433 linux_sys_rt_sigreturn(l, v, retval) 434 struct lwp *l; 435 void *v; 436 register_t *retval; 437 { 438 struct linux_sys_rt_sigreturn_args /* { 439 syscallarg(struct linux_rt_sigframe *) sfp; 440 } */ *uap = v; 441 struct linux_rt_sigframe *sfp, sigframe; 442 sigset_t mask; 443 444 /* 445 * The trampoline code hands us the context. 446 * It is unsafe to keep track of it ourselves, in the event that a 447 * program jumps out of a signal handler. 448 */ 449 450 sfp = SCARG(uap, sfp); 451 452 if (ALIGN(sfp) != (u_int64_t)sfp) 453 return(EINVAL); 454 455 /* 456 * Fetch the frame structure. 457 */ 458 if (copyin((void *)sfp, &sigframe, 459 sizeof(struct linux_rt_sigframe)) != 0) 460 return (EFAULT); 461 462 /* Grab the signal mask */ 463 linux_to_native_sigset(&mask, &sigframe.uc.uc_sigmask); 464 465 return(linux_restore_sigcontext(l, sigframe.uc.uc_mcontext, &mask)); 466 } 467 468 469 int 470 linux_sys_sigreturn(l, v, retval) 471 struct lwp *l; 472 void *v; 473 register_t *retval; 474 { 475 struct linux_sys_sigreturn_args /* { 476 syscallarg(struct linux_sigframe *) sfp; 477 } */ *uap = v; 478 struct linux_sigframe *sfp, frame; 479 sigset_t mask; 480 481 /* 482 * The trampoline code hands us the context. 483 * It is unsafe to keep track of it ourselves, in the event that a 484 * program jumps out of a signal handler. 485 */ 486 487 sfp = SCARG(uap, sfp); 488 if (ALIGN(sfp) != (u_int64_t)sfp) 489 return(EINVAL); 490 491 /* 492 * Fetch the frame structure. 493 */ 494 if (copyin((void *)sfp, &frame, sizeof(struct linux_sigframe)) != 0) 495 return(EFAULT); 496 497 /* Grab the signal mask. */ 498 /* XXX use frame.extramask */ 499 linux_old_to_native_sigset(&mask, frame.sf_sc.sc_mask); 500 501 return(linux_restore_sigcontext(l, frame.sf_sc, &mask)); 502 } 503 504 /* 505 * We come here in a last attempt to satisfy a Linux ioctl() call 506 */ 507 /* XXX XAX update this, add maps, etc... */ 508 int 509 linux_machdepioctl(l, v, retval) 510 struct lwp *l; 511 void *v; 512 register_t *retval; 513 { 514 struct linux_sys_ioctl_args /* { 515 syscallarg(int) fd; 516 syscallarg(u_long) com; 517 syscallarg(void *) data; 518 } */ *uap = v; 519 struct sys_ioctl_args bia; 520 u_long com; 521 522 SCARG(&bia, fd) = SCARG(uap, fd); 523 SCARG(&bia, data) = SCARG(uap, data); 524 com = SCARG(uap, com); 525 526 switch (com) { 527 default: 528 printf("linux_machdepioctl: invalid ioctl %08lx\n", com); 529 return EINVAL; 530 } 531 SCARG(&bia, com) = com; 532 return sys_ioctl(l, &bia, retval); 533 } 534 535 /* XXX XAX fix this */ 536 dev_t 537 linux_fakedev(dev, raw) 538 dev_t dev; 539 int raw; 540 { 541 return dev; 542 } 543 544 int 545 linux_usertrap(struct lwp *l, vaddr_t trapaddr, void *arg) 546 { 547 return 0; 548 } 549
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