linux_machdep.c revision 1.43.2.1
1 /* $NetBSD: linux_machdep.c,v 1.43.2.1 2008/05/10 23:48:51 wrstuden 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 * 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 * Based on sys/arch/i386/i386/linux_machdep.c: 32 * linux_machdep.c,v 1.42 1998/09/11 12:50:06 mycroft Exp 33 * written by Frank van der Linden 34 * 35 */ 36 37 #include <sys/cdefs.h> 38 __KERNEL_RCSID(0, "$NetBSD: linux_machdep.c,v 1.43.2.1 2008/05/10 23:48:51 wrstuden Exp $"); 39 40 #include <sys/param.h> 41 #include <sys/systm.h> 42 #include <sys/signalvar.h> 43 #include <sys/kernel.h> 44 #include <sys/proc.h> 45 #include <sys/user.h> 46 #include <sys/buf.h> 47 #include <sys/reboot.h> 48 #include <sys/conf.h> 49 #include <sys/exec.h> 50 #include <sys/file.h> 51 #include <sys/callout.h> 52 #include <sys/malloc.h> 53 #include <sys/mbuf.h> 54 #include <sys/msgbuf.h> 55 #include <sys/mount.h> 56 #include <sys/vnode.h> 57 #include <sys/device.h> 58 #include <sys/sa.h> 59 #include <sys/syscallargs.h> 60 #include <sys/filedesc.h> 61 #include <sys/exec_elf.h> 62 #include <sys/ioctl.h> 63 #include <sys/kauth.h> 64 65 #include <uvm/uvm_extern.h> 66 67 #include <compat/linux/common/linux_types.h> 68 #include <compat/linux/common/linux_signal.h> 69 #include <compat/linux/common/linux_siginfo.h> 70 #include <compat/linux/common/linux_util.h> 71 #include <compat/linux/common/linux_ioctl.h> 72 #include <compat/linux/common/linux_exec.h> 73 #include <compat/linux/common/linux_machdep.h> 74 #include <compat/linux/common/linux_emuldata.h> 75 76 #include <compat/linux/linux_syscallargs.h> 77 78 #include <machine/alpha.h> 79 #include <machine/reg.h> 80 81 #if defined(_KERNEL_OPT) 82 #include "wsdisplay.h" 83 #endif 84 #if (NWSDISPLAY >0) 85 #include <dev/wscons/wsdisplay_usl_io.h> 86 #endif 87 #ifdef DEBUG 88 #include <machine/sigdebug.h> 89 #endif 90 91 /* 92 * Deal with some alpha-specific things in the Linux emulation code. 93 */ 94 95 void 96 linux_setregs(struct lwp *l, struct exec_package *epp, u_long stack) 97 { 98 #ifdef DEBUG 99 struct trapframe *tfp = l->l_md.md_tf; 100 #endif 101 102 setregs(l, epp, stack); 103 #ifdef DEBUG 104 /* 105 * Linux has registers set to zero on entry; for DEBUG kernels 106 * the alpha setregs() fills registers with 0xbabefacedeadbeef. 107 */ 108 memset(tfp->tf_regs, 0, FRAME_SIZE * sizeof tfp->tf_regs[0]); 109 #endif 110 } 111 112 void 113 setup_linux_rt_sigframe(struct trapframe *tf, int sig, const sigset_t *mask) 114 { 115 struct lwp *l = curlwp; 116 struct proc *p = l->l_proc; 117 struct linux_rt_sigframe *sfp, sigframe; 118 int onstack, error; 119 int fsize, rndfsize; 120 extern char linux_rt_sigcode[], linux_rt_esigcode[]; 121 122 /* Do we need to jump onto the signal stack? */ 123 onstack = (l->l_sigstk->ss_flags & (SS_DISABLE | SS_ONSTACK)) == 0 && 124 (SIGACTION(p, sig).sa_flags & SA_ONSTACK) != 0; 125 126 /* Allocate space for the signal handler context. */ 127 fsize = sizeof(struct linux_rt_sigframe); 128 rndfsize = ((fsize + 15) / 16) * 16; 129 130 if (onstack) 131 sfp = (struct linux_rt_sigframe *) 132 ((char *)l->l_sigstk->ss_sp + l->l_sigstk->ss_size); 133 else 134 sfp = (struct linux_rt_sigframe *)(alpha_pal_rdusp()); 135 sfp = (struct linux_rt_sigframe *)((char *)sfp - rndfsize); 136 137 #ifdef DEBUG 138 if ((sigdebug & SDB_KSTACK) && (p->p_pid == sigpid)) 139 printf("linux_sendsig(%d): sig %d ssp %p usp %p\n", p->p_pid, 140 sig, &onstack, sfp); 141 #endif /* DEBUG */ 142 143 /* 144 * Build the signal context to be used by sigreturn. 145 */ 146 memset(&sigframe.uc, 0, sizeof(struct linux_ucontext)); 147 sigframe.uc.uc_mcontext.sc_onstack = onstack; 148 149 /* Setup potentially partial signal mask in sc_mask. */ 150 /* But get all of it in uc_sigmask */ 151 native_to_linux_old_sigset(&sigframe.uc.uc_mcontext.sc_mask, mask); 152 native_to_linux_sigset(&sigframe.uc.uc_sigmask, mask); 153 154 sigframe.uc.uc_mcontext.sc_pc = tf->tf_regs[FRAME_PC]; 155 sigframe.uc.uc_mcontext.sc_ps = ALPHA_PSL_USERMODE; 156 frametoreg(tf, (struct reg *)sigframe.uc.uc_mcontext.sc_regs); 157 sigframe.uc.uc_mcontext.sc_regs[R_SP] = alpha_pal_rdusp(); 158 159 alpha_enable_fp(l, 1); 160 sigframe.uc.uc_mcontext.sc_fpcr = alpha_read_fpcr(); 161 sigframe.uc.uc_mcontext.sc_fp_control = alpha_read_fp_c(l); 162 alpha_pal_wrfen(0); 163 164 sigframe.uc.uc_mcontext.sc_traparg_a0 = tf->tf_regs[FRAME_A0]; 165 sigframe.uc.uc_mcontext.sc_traparg_a1 = tf->tf_regs[FRAME_A1]; 166 sigframe.uc.uc_mcontext.sc_traparg_a2 = tf->tf_regs[FRAME_A2]; 167 168 /* 169 * XXX XAX Create bogus siginfo data. This can't really 170 * XXX be fixed until NetBSD has realtime signals. 171 * XXX Or we do the emuldata thing. 172 * XXX -erh 173 */ 174 memset(&sigframe.info, 0, sizeof(struct linux_siginfo)); 175 sigframe.info.lsi_signo = sig; 176 sigframe.info.lsi_code = LINUX_SI_USER; 177 sigframe.info.lsi_pid = p->p_pid; 178 sigframe.info.lsi_uid = kauth_cred_geteuid(l->l_cred); /* Use real uid here? */ 179 180 sendsig_reset(l, sig); 181 mutex_exit(p->p_lock); 182 error = copyout((void *)&sigframe, (void *)sfp, fsize); 183 mutex_enter(p->p_lock); 184 185 if (error != 0) { 186 #ifdef DEBUG 187 if ((sigdebug & SDB_KSTACK) && p->p_pid == sigpid) 188 printf("sendsig(%d): copyout failed on sig %d\n", 189 p->p_pid, sig); 190 #endif 191 /* 192 * Process has trashed its stack; give it an illegal 193 * instruction to halt it in its tracks. 194 */ 195 sigexit(l, SIGILL); 196 /* NOTREACHED */ 197 } 198 199 /* Pass pointers to siginfo and ucontext in the regs */ 200 tf->tf_regs[FRAME_A1] = (unsigned long)&sfp->info; 201 tf->tf_regs[FRAME_A2] = (unsigned long)&sfp->uc; 202 203 /* Address of trampoline code. End up at this PC after mi_switch */ 204 tf->tf_regs[FRAME_PC] = 205 (u_int64_t)(p->p_psstr - (linux_rt_esigcode - linux_rt_sigcode)); 206 207 /* Adjust the stack */ 208 alpha_pal_wrusp((unsigned long)sfp); 209 210 /* Remember that we're now on the signal stack. */ 211 if (onstack) 212 l->l_sigstk->ss_flags |= SS_ONSTACK; 213 } 214 215 void setup_linux_sigframe(tf, sig, mask) 216 struct trapframe *tf; 217 int sig; 218 const sigset_t *mask; 219 { 220 struct lwp *l = curlwp; 221 struct proc *p = l->l_proc; 222 struct linux_sigframe *sfp, sigframe; 223 int onstack, error; 224 int fsize, rndfsize; 225 extern char linux_sigcode[], linux_esigcode[]; 226 227 /* Do we need to jump onto the signal stack? */ 228 onstack = (l->l_sigstk->ss_flags & (SS_DISABLE | SS_ONSTACK)) == 0 && 229 (SIGACTION(p, sig).sa_flags & SA_ONSTACK) != 0; 230 231 /* Allocate space for the signal handler context. */ 232 fsize = sizeof(struct linux_sigframe); 233 rndfsize = ((fsize + 15) / 16) * 16; 234 235 if (onstack) 236 sfp = (struct linux_sigframe *) 237 ((char *)l->l_sigstk->ss_sp + l->l_sigstk->ss_size); 238 else 239 sfp = (struct linux_sigframe *)(alpha_pal_rdusp()); 240 sfp = (struct linux_sigframe *)((char *)sfp - rndfsize); 241 242 #ifdef DEBUG 243 if ((sigdebug & SDB_KSTACK) && (p->p_pid == sigpid)) 244 printf("linux_sendsig(%d): sig %d ssp %p usp %p\n", p->p_pid, 245 sig, &onstack, sfp); 246 #endif /* DEBUG */ 247 248 /* 249 * Build the signal context to be used by sigreturn. 250 */ 251 memset(&sigframe.sf_sc, 0, sizeof(struct linux_sigcontext)); 252 sigframe.sf_sc.sc_onstack = onstack; 253 native_to_linux_old_sigset(&sigframe.sf_sc.sc_mask, mask); 254 sigframe.sf_sc.sc_pc = tf->tf_regs[FRAME_PC]; 255 sigframe.sf_sc.sc_ps = ALPHA_PSL_USERMODE; 256 frametoreg(tf, (struct reg *)sigframe.sf_sc.sc_regs); 257 sigframe.sf_sc.sc_regs[R_SP] = alpha_pal_rdusp(); 258 259 if (l == fpcurlwp) { 260 alpha_pal_wrfen(1); 261 savefpstate(&l->l_addr->u_pcb.pcb_fp); 262 alpha_pal_wrfen(0); 263 sigframe.sf_sc.sc_fpcr = l->l_addr->u_pcb.pcb_fp.fpr_cr; 264 fpcurlwp = NULL; 265 } 266 /* XXX ownedfp ? etc...? */ 267 268 sigframe.sf_sc.sc_traparg_a0 = tf->tf_regs[FRAME_A0]; 269 sigframe.sf_sc.sc_traparg_a1 = tf->tf_regs[FRAME_A1]; 270 sigframe.sf_sc.sc_traparg_a2 = tf->tf_regs[FRAME_A2]; 271 272 sendsig_reset(l, sig); 273 mutex_exit(p->p_lock); 274 error = copyout((void *)&sigframe, (void *)sfp, fsize); 275 mutex_enter(p->p_lock); 276 277 if (error != 0) { 278 #ifdef DEBUG 279 if ((sigdebug & SDB_KSTACK) && p->p_pid == sigpid) 280 printf("sendsig(%d): copyout failed on sig %d\n", 281 p->p_pid, sig); 282 #endif 283 /* 284 * Process has trashed its stack; give it an illegal 285 * instruction to halt it in its tracks. 286 */ 287 sigexit(l, SIGILL); 288 /* NOTREACHED */ 289 } 290 291 /* Pass pointers to sigcontext in the regs */ 292 tf->tf_regs[FRAME_A1] = 0; 293 tf->tf_regs[FRAME_A2] = (unsigned long)&sfp->sf_sc; 294 295 /* Address of trampoline code. End up at this PC after mi_switch */ 296 tf->tf_regs[FRAME_PC] = 297 (u_int64_t)(p->p_psstr - (linux_esigcode - linux_sigcode)); 298 299 /* Adjust the stack */ 300 alpha_pal_wrusp((unsigned long)sfp); 301 302 /* Remember that we're now on the signal stack. */ 303 if (onstack) 304 l->l_sigstk->ss_flags |= SS_ONSTACK; 305 } 306 307 /* 308 * Send an interrupt to process. 309 * 310 * Stack is set up to allow sigcode stored 311 * in u. to call routine, followed by kcall 312 * to sigreturn routine below. After sigreturn 313 * resets the signal mask, the stack, and the 314 * frame pointer, it returns to the user 315 * specified pc, psl. 316 */ 317 void 318 linux_sendsig(const ksiginfo_t *ksi, const sigset_t *mask) 319 { 320 struct lwp *l = curlwp; 321 struct proc *p = l->l_proc; 322 struct trapframe *tf = l->l_md.md_tf; 323 const int sig = ksi->ksi_signo; 324 sig_t catcher = SIGACTION(p, sig).sa_handler; 325 #ifdef notyet 326 struct linux_emuldata *edp; 327 328 /* Setup the signal frame (and part of the trapframe) */ 329 /*OLD: if (p->p_sigacts->ps_siginfo & sigmask(sig))*/ 330 /* XXX XAX this is broken now. need someplace to store what 331 XXX XAX kind of signal handler a signal has.*/ 332 #if 0 333 edp = (struct linux_emuldata *)p->p_emuldata; 334 #else 335 edp = 0; 336 #endif 337 if (edp && sigismember(&edp->ps_siginfo, sig)) 338 setup_linux_rt_sigframe(tf, sig, mask); 339 else 340 #endif /* notyet */ 341 setup_linux_sigframe(tf, sig, mask); 342 343 /* Signal handler for trampoline code */ 344 tf->tf_regs[FRAME_T12] = (u_int64_t)catcher; 345 tf->tf_regs[FRAME_A0] = native_to_linux_signo[sig]; 346 347 /* 348 * Linux has a custom restorer option. To support it we would 349 * need to store an array of restorers and a sigcode block 350 * which knew to use it. Doesn't seem worth the trouble. 351 * -erh 352 */ 353 354 #ifdef DEBUG 355 if (sigdebug & SDB_FOLLOW) 356 printf("sendsig(%d): pc %lx, catcher %lx\n", l->l_proc->p_pid, 357 tf->tf_regs[FRAME_PC], tf->tf_regs[FRAME_A3]); 358 if ((sigdebug & SDB_KSTACK) && l->l_proc->p_pid == sigpid) 359 printf("sendsig(%d): sig %d returns\n", l->l_proc->p_pid, sig); 360 #endif 361 } 362 363 /* 364 * System call to cleanup state after a signal 365 * has been taken. Reset signal mask and 366 * stack state from context left by sendsig (above). 367 * Return to previous pc as specified by context 368 * left by sendsig. 369 * Linux real-time signals use a different sigframe, 370 * but the sigcontext is the same. 371 */ 372 373 int 374 linux_restore_sigcontext(struct lwp *l, struct linux_sigcontext context, 375 sigset_t *mask) 376 { 377 struct proc *p = l->l_proc; 378 379 /* 380 * Linux doesn't (yet) have alternate signal stacks. 381 * However, the OSF/1 sigcontext which they use has 382 * an onstack member. This could be needed in the future. 383 */ 384 mutex_enter(p->p_lock); 385 if (context.sc_onstack & LINUX_SA_ONSTACK) 386 l->l_sigstk->ss_flags |= SS_ONSTACK; 387 else 388 l->l_sigstk->ss_flags &= ~SS_ONSTACK; 389 390 /* Reset the signal mask */ 391 (void) sigprocmask1(l, SIG_SETMASK, mask, 0); 392 mutex_exit(p->p_lock); 393 394 /* 395 * Check for security violations. 396 * Linux doesn't allow any changes to the PSL. 397 */ 398 if (context.sc_ps != ALPHA_PSL_USERMODE) 399 return(EINVAL); 400 401 l->l_md.md_tf->tf_regs[FRAME_PC] = context.sc_pc; 402 l->l_md.md_tf->tf_regs[FRAME_PS] = context.sc_ps; 403 404 regtoframe((struct reg *)context.sc_regs, l->l_md.md_tf); 405 alpha_pal_wrusp(context.sc_regs[R_SP]); 406 407 if (l == fpcurlwp) 408 fpcurlwp = NULL; 409 410 /* Restore fp regs and fpr_cr */ 411 bcopy((struct fpreg *)context.sc_fpregs, &l->l_addr->u_pcb.pcb_fp, 412 sizeof(struct fpreg)); 413 /* XXX sc_ownedfp ? */ 414 /* XXX sc_fp_control ? */ 415 416 #ifdef DEBUG 417 if (sigdebug & SDB_FOLLOW) 418 printf("linux_rt_sigreturn(%d): returns\n", p->p_pid); 419 #endif 420 return (EJUSTRETURN); 421 } 422 423 int 424 linux_sys_rt_sigreturn(struct lwp *l, const struct linux_sys_rt_sigreturn_args *uap, register_t *retval) 425 { 426 /* { 427 syscallarg(struct linux_rt_sigframe *) sfp; 428 } */ 429 struct linux_rt_sigframe *sfp, sigframe; 430 sigset_t mask; 431 432 /* 433 * The trampoline code hands us the context. 434 * It is unsafe to keep track of it ourselves, in the event that a 435 * program jumps out of a signal handler. 436 */ 437 438 sfp = SCARG(uap, sfp); 439 440 if (ALIGN(sfp) != (u_int64_t)sfp) 441 return(EINVAL); 442 443 /* 444 * Fetch the frame structure. 445 */ 446 if (copyin((void *)sfp, &sigframe, 447 sizeof(struct linux_rt_sigframe)) != 0) 448 return (EFAULT); 449 450 /* Grab the signal mask */ 451 linux_to_native_sigset(&mask, &sigframe.uc.uc_sigmask); 452 453 return(linux_restore_sigcontext(l, sigframe.uc.uc_mcontext, &mask)); 454 } 455 456 457 int 458 linux_sys_sigreturn(struct lwp *l, const struct linux_sys_sigreturn_args *uap, register_t *retval) 459 { 460 /* { 461 syscallarg(struct linux_sigframe *) sfp; 462 } */ 463 struct linux_sigframe *sfp, frame; 464 sigset_t mask; 465 466 /* 467 * The trampoline code hands us the context. 468 * It is unsafe to keep track of it ourselves, in the event that a 469 * program jumps out of a signal handler. 470 */ 471 472 sfp = SCARG(uap, sfp); 473 if (ALIGN(sfp) != (u_int64_t)sfp) 474 return(EINVAL); 475 476 /* 477 * Fetch the frame structure. 478 */ 479 if (copyin((void *)sfp, &frame, sizeof(struct linux_sigframe)) != 0) 480 return(EFAULT); 481 482 /* Grab the signal mask. */ 483 /* XXX use frame.extramask */ 484 linux_old_to_native_sigset(&mask, frame.sf_sc.sc_mask); 485 486 return(linux_restore_sigcontext(l, frame.sf_sc, &mask)); 487 } 488 489 /* 490 * We come here in a last attempt to satisfy a Linux ioctl() call 491 */ 492 /* XXX XAX update this, add maps, etc... */ 493 int 494 linux_machdepioctl(struct lwp *l, const struct linux_sys_ioctl_args *uap, register_t *retval) 495 { 496 /* { 497 syscallarg(int) fd; 498 syscallarg(u_long) com; 499 syscallarg(void *) data; 500 } */ 501 struct sys_ioctl_args bia; 502 u_long com; 503 504 SCARG(&bia, fd) = SCARG(uap, fd); 505 SCARG(&bia, data) = SCARG(uap, data); 506 com = SCARG(uap, com); 507 508 switch (com) { 509 default: 510 printf("linux_machdepioctl: invalid ioctl %08lx\n", com); 511 return EINVAL; 512 } 513 SCARG(&bia, com) = com; 514 return sys_ioctl(l, &bia, retval); 515 } 516 517 /* XXX XAX fix this */ 518 dev_t 519 linux_fakedev(dev_t dev, int raw) 520 { 521 return dev; 522 } 523 524 int 525 linux_usertrap(struct lwp *l, vaddr_t trapaddr, void *arg) 526 { 527 return 0; 528 } 529
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