linux_machdep.c revision 1.47.2.1
1 /* $NetBSD: linux_machdep.c,v 1.47.2.1 2011/06/23 14:19:53 cherry 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 1.47.2.1 2011/06/23 14:19:53 cherry 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/buf.h> 46 #include <sys/reboot.h> 47 #include <sys/conf.h> 48 #include <sys/exec.h> 49 #include <sys/file.h> 50 #include <sys/callout.h> 51 #include <sys/malloc.h> 52 #include <sys/mbuf.h> 53 #include <sys/msgbuf.h> 54 #include <sys/mount.h> 55 #include <sys/vnode.h> 56 #include <sys/device.h> 57 #include <sys/syscallargs.h> 58 #include <sys/filedesc.h> 59 #include <sys/exec_elf.h> 60 #include <sys/ioctl.h> 61 #include <sys/kauth.h> 62 63 #include <uvm/uvm_extern.h> 64 65 #include <compat/linux/common/linux_types.h> 66 #include <compat/linux/common/linux_signal.h> 67 #include <compat/linux/common/linux_siginfo.h> 68 #include <compat/linux/common/linux_util.h> 69 #include <compat/linux/common/linux_ioctl.h> 70 #include <compat/linux/common/linux_exec.h> 71 #include <compat/linux/common/linux_machdep.h> 72 #include <compat/linux/common/linux_emuldata.h> 73 74 #include <compat/linux/linux_syscallargs.h> 75 76 #include <machine/alpha.h> 77 #include <machine/reg.h> 78 79 #if defined(_KERNEL_OPT) 80 #include "wsdisplay.h" 81 #endif 82 #if (NWSDISPLAY >0) 83 #include <dev/wscons/wsdisplay_usl_io.h> 84 #endif 85 #ifdef DEBUG 86 #include <machine/sigdebug.h> 87 #endif 88 89 /* 90 * Deal with some alpha-specific things in the Linux emulation code. 91 */ 92 93 void 94 linux_setregs(struct lwp *l, struct exec_package *epp, vaddr_t stack) 95 { 96 #ifdef DEBUG 97 struct trapframe *tfp = l->l_md.md_tf; 98 #endif 99 100 setregs(l, epp, stack); 101 #ifdef DEBUG 102 /* 103 * Linux has registers set to zero on entry; for DEBUG kernels 104 * the alpha setregs() fills registers with 0xbabefacedeadbeef. 105 */ 106 memset(tfp->tf_regs, 0, FRAME_SIZE * sizeof tfp->tf_regs[0]); 107 #endif 108 } 109 110 void 111 setup_linux_rt_sigframe(struct trapframe *tf, int sig, const sigset_t *mask) 112 { 113 struct lwp *l = curlwp; 114 struct proc *p = l->l_proc; 115 struct linux_rt_sigframe *sfp, sigframe; 116 int onstack, error; 117 int fsize, rndfsize; 118 extern char linux_rt_sigcode[], linux_rt_esigcode[]; 119 120 /* Do we need to jump onto the signal stack? */ 121 onstack = (l->l_sigstk.ss_flags & (SS_DISABLE | SS_ONSTACK)) == 0 && 122 (SIGACTION(p, sig).sa_flags & SA_ONSTACK) != 0; 123 124 /* Allocate space for the signal handler context. */ 125 fsize = sizeof(struct linux_rt_sigframe); 126 rndfsize = ((fsize + 15) / 16) * 16; 127 128 if (onstack) 129 sfp = (struct linux_rt_sigframe *) 130 ((char *)l->l_sigstk.ss_sp + l->l_sigstk.ss_size); 131 else 132 sfp = (struct linux_rt_sigframe *)(alpha_pal_rdusp()); 133 sfp = (struct linux_rt_sigframe *)((char *)sfp - rndfsize); 134 135 #ifdef DEBUG 136 if ((sigdebug & SDB_KSTACK) && (p->p_pid == sigpid)) 137 printf("linux_sendsig(%d): sig %d ssp %p usp %p\n", p->p_pid, 138 sig, &onstack, sfp); 139 #endif /* DEBUG */ 140 141 /* 142 * Build the signal context to be used by sigreturn. 143 */ 144 memset(&sigframe.uc, 0, sizeof(struct linux_ucontext)); 145 sigframe.uc.uc_mcontext.sc_onstack = onstack; 146 147 /* Setup potentially partial signal mask in sc_mask. */ 148 /* But get all of it in uc_sigmask */ 149 native_to_linux_old_sigset(&sigframe.uc.uc_mcontext.sc_mask, mask); 150 native_to_linux_sigset(&sigframe.uc.uc_sigmask, mask); 151 152 sigframe.uc.uc_mcontext.sc_pc = tf->tf_regs[FRAME_PC]; 153 sigframe.uc.uc_mcontext.sc_ps = ALPHA_PSL_USERMODE; 154 frametoreg(tf, (struct reg *)sigframe.uc.uc_mcontext.sc_regs); 155 sigframe.uc.uc_mcontext.sc_regs[R_SP] = alpha_pal_rdusp(); 156 157 fpu_load(); 158 alpha_pal_wrfen(1); 159 sigframe.uc.uc_mcontext.sc_fpcr = alpha_read_fpcr(); 160 sigframe.uc.uc_mcontext.sc_fp_control = alpha_read_fp_c(l); 161 alpha_pal_wrfen(0); 162 163 sigframe.uc.uc_mcontext.sc_traparg_a0 = tf->tf_regs[FRAME_A0]; 164 sigframe.uc.uc_mcontext.sc_traparg_a1 = tf->tf_regs[FRAME_A1]; 165 sigframe.uc.uc_mcontext.sc_traparg_a2 = tf->tf_regs[FRAME_A2]; 166 167 /* 168 * XXX XAX Create bogus siginfo data. This can't really 169 * XXX be fixed until NetBSD has realtime signals. 170 * XXX Or we do the emuldata thing. 171 * XXX -erh 172 */ 173 memset(&sigframe.info, 0, sizeof(struct linux_siginfo)); 174 sigframe.info.lsi_signo = sig; 175 sigframe.info.lsi_code = LINUX_SI_USER; 176 sigframe.info.lsi_pid = p->p_pid; 177 sigframe.info.lsi_uid = kauth_cred_geteuid(l->l_cred); /* Use real uid here? */ 178 179 sendsig_reset(l, sig); 180 mutex_exit(p->p_lock); 181 error = copyout((void *)&sigframe, (void *)sfp, fsize); 182 mutex_enter(p->p_lock); 183 184 if (error != 0) { 185 #ifdef DEBUG 186 if ((sigdebug & SDB_KSTACK) && p->p_pid == sigpid) 187 printf("sendsig(%d): copyout failed on sig %d\n", 188 p->p_pid, sig); 189 #endif 190 /* 191 * Process has trashed its stack; give it an illegal 192 * instruction to halt it in its tracks. 193 */ 194 sigexit(l, SIGILL); 195 /* NOTREACHED */ 196 } 197 198 /* Pass pointers to siginfo and ucontext in the regs */ 199 tf->tf_regs[FRAME_A1] = (unsigned long)&sfp->info; 200 tf->tf_regs[FRAME_A2] = (unsigned long)&sfp->uc; 201 202 /* Address of trampoline code. End up at this PC after mi_switch */ 203 tf->tf_regs[FRAME_PC] = 204 (u_int64_t)(p->p_psstrp - (linux_rt_esigcode - linux_rt_sigcode)); 205 206 /* Adjust the stack */ 207 alpha_pal_wrusp((unsigned long)sfp); 208 209 /* Remember that we're now on the signal stack. */ 210 if (onstack) 211 l->l_sigstk.ss_flags |= SS_ONSTACK; 212 } 213 214 void setup_linux_sigframe(tf, sig, mask) 215 struct trapframe *tf; 216 int sig; 217 const sigset_t *mask; 218 { 219 struct lwp *l = curlwp; 220 struct proc *p = l->l_proc; 221 struct linux_sigframe *sfp, sigframe; 222 int onstack, error; 223 int fsize, rndfsize; 224 extern char linux_sigcode[], linux_esigcode[]; 225 226 /* Do we need to jump onto the signal stack? */ 227 onstack = (l->l_sigstk.ss_flags & (SS_DISABLE | SS_ONSTACK)) == 0 && 228 (SIGACTION(p, sig).sa_flags & SA_ONSTACK) != 0; 229 230 /* Allocate space for the signal handler context. */ 231 fsize = sizeof(struct linux_sigframe); 232 rndfsize = ((fsize + 15) / 16) * 16; 233 234 if (onstack) 235 sfp = (struct linux_sigframe *) 236 ((char *)l->l_sigstk.ss_sp + l->l_sigstk.ss_size); 237 else 238 sfp = (struct linux_sigframe *)(alpha_pal_rdusp()); 239 sfp = (struct linux_sigframe *)((char *)sfp - rndfsize); 240 241 #ifdef DEBUG 242 if ((sigdebug & SDB_KSTACK) && (p->p_pid == sigpid)) 243 printf("linux_sendsig(%d): sig %d ssp %p usp %p\n", p->p_pid, 244 sig, &onstack, sfp); 245 #endif /* DEBUG */ 246 247 /* 248 * Build the signal context to be used by sigreturn. 249 */ 250 memset(&sigframe.sf_sc, 0, sizeof(struct linux_sigcontext)); 251 sigframe.sf_sc.sc_onstack = onstack; 252 native_to_linux_old_sigset(&sigframe.sf_sc.sc_mask, mask); 253 sigframe.sf_sc.sc_pc = tf->tf_regs[FRAME_PC]; 254 sigframe.sf_sc.sc_ps = ALPHA_PSL_USERMODE; 255 frametoreg(tf, (struct reg *)sigframe.sf_sc.sc_regs); 256 sigframe.sf_sc.sc_regs[R_SP] = alpha_pal_rdusp(); 257 258 if (l == fpcurlwp) { 259 struct pcb *pcb = lwp_getpcb(l); 260 261 alpha_pal_wrfen(1); 262 savefpstate(&pcb->pcb_fp); 263 alpha_pal_wrfen(0); 264 sigframe.sf_sc.sc_fpcr = pcb->pcb_fp.fpr_cr; 265 fpcurlwp = NULL; 266 } 267 /* XXX ownedfp ? etc...? */ 268 269 sigframe.sf_sc.sc_traparg_a0 = tf->tf_regs[FRAME_A0]; 270 sigframe.sf_sc.sc_traparg_a1 = tf->tf_regs[FRAME_A1]; 271 sigframe.sf_sc.sc_traparg_a2 = tf->tf_regs[FRAME_A2]; 272 273 sendsig_reset(l, sig); 274 mutex_exit(p->p_lock); 275 error = copyout((void *)&sigframe, (void *)sfp, fsize); 276 mutex_enter(p->p_lock); 277 278 if (error != 0) { 279 #ifdef DEBUG 280 if ((sigdebug & SDB_KSTACK) && p->p_pid == sigpid) 281 printf("sendsig(%d): copyout failed on sig %d\n", 282 p->p_pid, sig); 283 #endif 284 /* 285 * Process has trashed its stack; give it an illegal 286 * instruction to halt it in its tracks. 287 */ 288 sigexit(l, SIGILL); 289 /* NOTREACHED */ 290 } 291 292 /* Pass pointers to sigcontext in the regs */ 293 tf->tf_regs[FRAME_A1] = 0; 294 tf->tf_regs[FRAME_A2] = (unsigned long)&sfp->sf_sc; 295 296 /* Address of trampoline code. End up at this PC after mi_switch */ 297 tf->tf_regs[FRAME_PC] = 298 (u_int64_t)(p->p_psstrp - (linux_esigcode - linux_sigcode)); 299 300 /* Adjust the stack */ 301 alpha_pal_wrusp((unsigned long)sfp); 302 303 /* Remember that we're now on the signal stack. */ 304 if (onstack) 305 l->l_sigstk.ss_flags |= SS_ONSTACK; 306 } 307 308 /* 309 * Send an interrupt to process. 310 * 311 * Stack is set up to allow sigcode stored 312 * in u. to call routine, followed by kcall 313 * to sigreturn routine below. After sigreturn 314 * resets the signal mask, the stack, and the 315 * frame pointer, it returns to the user 316 * specified pc, psl. 317 */ 318 void 319 linux_sendsig(const ksiginfo_t *ksi, const sigset_t *mask) 320 { 321 struct lwp *l = curlwp; 322 struct proc *p = l->l_proc; 323 struct trapframe *tf = l->l_md.md_tf; 324 const int sig = ksi->ksi_signo; 325 sig_t catcher = SIGACTION(p, sig).sa_handler; 326 #ifdef notyet 327 struct linux_emuldata *edp; 328 329 /* Setup the signal frame (and part of the trapframe) */ 330 /*OLD: if (p->p_sigacts->ps_siginfo & sigmask(sig))*/ 331 /* XXX XAX this is broken now. need someplace to store what 332 XXX XAX kind of signal handler a signal has.*/ 333 #if 0 334 edp = (struct linux_emuldata *)p->p_emuldata; 335 #else 336 edp = 0; 337 #endif 338 if (edp && sigismember(&edp->ps_siginfo, sig)) 339 setup_linux_rt_sigframe(tf, sig, mask); 340 else 341 #endif /* notyet */ 342 setup_linux_sigframe(tf, sig, mask); 343 344 /* Signal handler for trampoline code */ 345 tf->tf_regs[FRAME_T12] = (u_int64_t)catcher; 346 tf->tf_regs[FRAME_A0] = native_to_linux_signo[sig]; 347 348 /* 349 * Linux has a custom restorer option. To support it we would 350 * need to store an array of restorers and a sigcode block 351 * which knew to use it. Doesn't seem worth the trouble. 352 * -erh 353 */ 354 355 #ifdef DEBUG 356 if (sigdebug & SDB_FOLLOW) 357 printf("sendsig(%d): pc %lx, catcher %lx\n", l->l_proc->p_pid, 358 tf->tf_regs[FRAME_PC], tf->tf_regs[FRAME_A3]); 359 if ((sigdebug & SDB_KSTACK) && l->l_proc->p_pid == sigpid) 360 printf("sendsig(%d): sig %d returns\n", l->l_proc->p_pid, sig); 361 #endif 362 } 363 364 /* 365 * System call to cleanup state after a signal 366 * has been taken. Reset signal mask and 367 * stack state from context left by sendsig (above). 368 * Return to previous pc as specified by context 369 * left by sendsig. 370 * Linux real-time signals use a different sigframe, 371 * but the sigcontext is the same. 372 */ 373 374 int 375 linux_restore_sigcontext(struct lwp *l, struct linux_sigcontext context, 376 sigset_t *mask) 377 { 378 struct proc *p = l->l_proc; 379 struct pcb *pcb; 380 381 /* 382 * Linux doesn't (yet) have alternate signal stacks. 383 * However, the OSF/1 sigcontext which they use has 384 * an onstack member. This could be needed in the future. 385 */ 386 mutex_enter(p->p_lock); 387 if (context.sc_onstack & LINUX_SA_ONSTACK) 388 l->l_sigstk.ss_flags |= SS_ONSTACK; 389 else 390 l->l_sigstk.ss_flags &= ~SS_ONSTACK; 391 392 /* Reset the signal mask */ 393 (void) sigprocmask1(l, SIG_SETMASK, mask, 0); 394 mutex_exit(p->p_lock); 395 396 /* 397 * Check for security violations. 398 * Linux doesn't allow any changes to the PSL. 399 */ 400 if (context.sc_ps != ALPHA_PSL_USERMODE) 401 return(EINVAL); 402 403 l->l_md.md_tf->tf_regs[FRAME_PC] = context.sc_pc; 404 l->l_md.md_tf->tf_regs[FRAME_PS] = context.sc_ps; 405 406 regtoframe((struct reg *)context.sc_regs, l->l_md.md_tf); 407 alpha_pal_wrusp(context.sc_regs[R_SP]); 408 409 if (l == fpcurlwp) 410 fpcurlwp = NULL; 411 412 /* Restore fp regs and fpr_cr */ 413 pcb = lwp_getpcb(l); 414 memcpy(&pcb->pcb_fp, (struct fpreg *)context.sc_fpregs, 415 sizeof(struct fpreg)); 416 /* XXX sc_ownedfp ? */ 417 /* XXX sc_fp_control ? */ 418 419 #ifdef DEBUG 420 if (sigdebug & SDB_FOLLOW) 421 printf("linux_rt_sigreturn(%d): returns\n", p->p_pid); 422 #endif 423 return (EJUSTRETURN); 424 } 425 426 int 427 linux_sys_rt_sigreturn(struct lwp *l, const struct linux_sys_rt_sigreturn_args *uap, register_t *retval) 428 { 429 /* { 430 syscallarg(struct linux_rt_sigframe *) sfp; 431 } */ 432 struct linux_rt_sigframe *sfp, sigframe; 433 sigset_t mask; 434 435 /* 436 * The trampoline code hands us the context. 437 * It is unsafe to keep track of it ourselves, in the event that a 438 * program jumps out of a signal handler. 439 */ 440 441 sfp = SCARG(uap, sfp); 442 443 if (ALIGN(sfp) != (u_int64_t)sfp) 444 return(EINVAL); 445 446 /* 447 * Fetch the frame structure. 448 */ 449 if (copyin((void *)sfp, &sigframe, 450 sizeof(struct linux_rt_sigframe)) != 0) 451 return (EFAULT); 452 453 /* Grab the signal mask */ 454 linux_to_native_sigset(&mask, &sigframe.uc.uc_sigmask); 455 456 return(linux_restore_sigcontext(l, sigframe.uc.uc_mcontext, &mask)); 457 } 458 459 460 int 461 linux_sys_sigreturn(struct lwp *l, const struct linux_sys_sigreturn_args *uap, register_t *retval) 462 { 463 /* { 464 syscallarg(struct linux_sigframe *) sfp; 465 } */ 466 struct linux_sigframe *sfp, frame; 467 sigset_t mask; 468 469 /* 470 * The trampoline code hands us the context. 471 * It is unsafe to keep track of it ourselves, in the event that a 472 * program jumps out of a signal handler. 473 */ 474 475 sfp = SCARG(uap, sfp); 476 if (ALIGN(sfp) != (u_int64_t)sfp) 477 return(EINVAL); 478 479 /* 480 * Fetch the frame structure. 481 */ 482 if (copyin((void *)sfp, &frame, sizeof(struct linux_sigframe)) != 0) 483 return(EFAULT); 484 485 /* Grab the signal mask. */ 486 /* XXX use frame.extramask */ 487 linux_old_to_native_sigset(&mask, frame.sf_sc.sc_mask); 488 489 return(linux_restore_sigcontext(l, frame.sf_sc, &mask)); 490 } 491 492 /* 493 * We come here in a last attempt to satisfy a Linux ioctl() call 494 */ 495 /* XXX XAX update this, add maps, etc... */ 496 int 497 linux_machdepioctl(struct lwp *l, const struct linux_sys_ioctl_args *uap, register_t *retval) 498 { 499 /* { 500 syscallarg(int) fd; 501 syscallarg(u_long) com; 502 syscallarg(void *) data; 503 } */ 504 struct sys_ioctl_args bia; 505 u_long com; 506 507 SCARG(&bia, fd) = SCARG(uap, fd); 508 SCARG(&bia, data) = SCARG(uap, data); 509 com = SCARG(uap, com); 510 511 switch (com) { 512 default: 513 printf("linux_machdepioctl: invalid ioctl %08lx\n", com); 514 return EINVAL; 515 } 516 SCARG(&bia, com) = com; 517 return sys_ioctl(l, &bia, retval); 518 } 519 520 /* XXX XAX fix this */ 521 dev_t 522 linux_fakedev(dev_t dev, int raw) 523 { 524 return dev; 525 } 526 527 int 528 linux_usertrap(struct lwp *l, vaddr_t trapaddr, void *arg) 529 { 530 return 0; 531 } 532
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