1 /* $NetBSD: linux_machdep.c,v 1.25 2002/09/25 22:21:33 thorpej 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 1.25 2002/09/25 22:21:33 thorpej 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 70 #include <uvm/uvm_extern.h> 71 72 #include <compat/linux/common/linux_types.h> 73 #include <compat/linux/common/linux_signal.h> 74 #include <compat/linux/common/linux_siginfo.h> 75 #include <compat/linux/common/linux_util.h> 76 #include <compat/linux/common/linux_ioctl.h> 77 #include <compat/linux/common/linux_exec.h> 78 #include <compat/linux/common/linux_machdep.h> 79 #include <compat/linux/common/linux_emuldata.h> 80 81 #include <compat/linux/linux_syscallargs.h> 82 83 #include <machine/alpha.h> 84 #include <machine/reg.h> 85 86 #if defined(_KERNEL_OPT) 87 #include "wsdisplay.h" 88 #endif 89 #if (NWSDISPLAY >0) 90 #include <dev/wscons/wsdisplay_usl_io.h> 91 #endif 92 #ifdef DEBUG 93 #include <machine/sigdebug.h> 94 #endif 95 96 /* 97 * Deal with some alpha-specific things in the Linux emulation code. 98 */ 99 100 void 101 linux_setregs(p, epp, stack) 102 struct proc *p; 103 struct exec_package *epp; 104 u_long stack; 105 { 106 #ifdef DEBUG 107 struct trapframe *tfp = p->p_md.md_tf; 108 #endif 109 110 setregs(p, epp, stack); 111 #ifdef DEBUG 112 /* 113 * Linux has registers set to zero on entry; for DEBUG kernels 114 * the alpha setregs() fills registers with 0xbabefacedeadbeef. 115 */ 116 memset(tfp->tf_regs, 0, FRAME_SIZE * sizeof tfp->tf_regs[0]); 117 #endif 118 } 119 120 void setup_linux_rt_sigframe(tf, sig, mask) 121 struct trapframe *tf; 122 int sig; 123 sigset_t *mask; 124 { 125 struct proc *p = curproc; 126 struct linux_rt_sigframe *sfp, sigframe; 127 int onstack; 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 = (p->p_sigctx.ps_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)p->p_sigctx.ps_sigstk.ss_sp + 142 p->p_sigctx.ps_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 bzero(&sigframe.uc, 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(p, 1); 170 sigframe.uc.uc_mcontext.sc_fpcr = alpha_read_fpcr(); 171 sigframe.uc.uc_mcontext.sc_fp_control = alpha_read_fp_c(p); 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 bzero(&sigframe.info, 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 = p->p_ucred->cr_uid; /* Use real uid here? */ 189 190 if (copyout((caddr_t)&sigframe, (caddr_t)sfp, fsize) != 0) { 191 #ifdef DEBUG 192 if ((sigdebug & SDB_KSTACK) && p->p_pid == sigpid) 193 printf("sendsig(%d): copyout failed on sig %d\n", 194 p->p_pid, sig); 195 #endif 196 /* 197 * Process has trashed its stack; give it an illegal 198 * instruction to halt it in its tracks. 199 */ 200 sigexit(p, SIGILL); 201 /* NOTREACHED */ 202 } 203 204 /* Pass pointers to siginfo and ucontext in the regs */ 205 tf->tf_regs[FRAME_A1] = (unsigned long)&sfp->info; 206 tf->tf_regs[FRAME_A2] = (unsigned long)&sfp->uc; 207 208 /* Address of trampoline code. End up at this PC after mi_switch */ 209 tf->tf_regs[FRAME_PC] = 210 (u_int64_t)(p->p_psstr - (linux_rt_esigcode - linux_rt_sigcode)); 211 212 /* Adjust the stack */ 213 alpha_pal_wrusp((unsigned long)sfp); 214 215 /* Remember that we're now on the signal stack. */ 216 if (onstack) 217 p->p_sigctx.ps_sigstk.ss_flags |= SS_ONSTACK; 218 } 219 220 void setup_linux_sigframe(tf, sig, mask) 221 struct trapframe *tf; 222 int sig; 223 sigset_t *mask; 224 { 225 struct proc *p = curproc; 226 struct linux_sigframe *sfp, sigframe; 227 int onstack; 228 int fsize, rndfsize; 229 extern char linux_sigcode[], linux_esigcode[]; 230 231 /* Do we need to jump onto the signal stack? */ 232 onstack = (p->p_sigctx.ps_sigstk.ss_flags & (SS_DISABLE | SS_ONSTACK)) == 0 && 233 (SIGACTION(p, sig).sa_flags & SA_ONSTACK) != 0; 234 235 /* Allocate space for the signal handler context. */ 236 fsize = sizeof(struct linux_sigframe); 237 rndfsize = ((fsize + 15) / 16) * 16; 238 239 if (onstack) 240 sfp = (struct linux_sigframe *) 241 ((caddr_t)p->p_sigctx.ps_sigstk.ss_sp + 242 p->p_sigctx.ps_sigstk.ss_size); 243 else 244 sfp = (struct linux_sigframe *)(alpha_pal_rdusp()); 245 sfp = (struct linux_sigframe *)((caddr_t)sfp - rndfsize); 246 247 #ifdef DEBUG 248 if ((sigdebug & SDB_KSTACK) && (p->p_pid == sigpid)) 249 printf("linux_sendsig(%d): sig %d ssp %p usp %p\n", p->p_pid, 250 sig, &onstack, sfp); 251 #endif /* DEBUG */ 252 253 /* 254 * Build the signal context to be used by sigreturn. 255 */ 256 bzero(&sigframe.sf_sc, sizeof(struct linux_ucontext)); 257 sigframe.sf_sc.sc_onstack = onstack; 258 native_to_linux_old_sigset(&sigframe.sf_sc.sc_mask, mask); 259 sigframe.sf_sc.sc_pc = tf->tf_regs[FRAME_PC]; 260 sigframe.sf_sc.sc_ps = ALPHA_PSL_USERMODE; 261 frametoreg(tf, (struct reg *)sigframe.sf_sc.sc_regs); 262 sigframe.sf_sc.sc_regs[R_SP] = alpha_pal_rdusp(); 263 264 if (p == fpcurproc) { 265 alpha_pal_wrfen(1); 266 savefpstate(&p->p_addr->u_pcb.pcb_fp); 267 alpha_pal_wrfen(0); 268 sigframe.sf_sc.sc_fpcr = p->p_addr->u_pcb.pcb_fp.fpr_cr; 269 fpcurproc = NULL; 270 } 271 /* XXX ownedfp ? etc...? */ 272 273 sigframe.sf_sc.sc_traparg_a0 = tf->tf_regs[FRAME_A0]; 274 sigframe.sf_sc.sc_traparg_a1 = tf->tf_regs[FRAME_A1]; 275 sigframe.sf_sc.sc_traparg_a2 = tf->tf_regs[FRAME_A2]; 276 277 if (copyout((caddr_t)&sigframe, (caddr_t)sfp, fsize) != 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(p, 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 p->p_sigctx.ps_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(sig, mask, code) 319 int sig; 320 sigset_t *mask; 321 u_long code; 322 { 323 struct proc *p = curproc; 324 struct trapframe *tf = p->p_md.md_tf; 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", p->p_pid, 358 tf->tf_regs[FRAME_PC], tf->tf_regs[FRAME_A3]); 359 if ((sigdebug & SDB_KSTACK) && p->p_pid == sigpid) 360 printf("sendsig(%d): sig %d returns\n", p->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 proc *p, struct linux_sigcontext context, 376 sigset_t *mask) 377 { 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 if (context.sc_onstack & LINUX_SA_ONSTACK) 385 p->p_sigctx.ps_sigstk.ss_flags |= SS_ONSTACK; 386 else 387 p->p_sigctx.ps_sigstk.ss_flags &= ~SS_ONSTACK; 388 389 /* Reset the signal mask */ 390 (void) sigprocmask1(p, SIG_SETMASK, mask, 0); 391 392 /* 393 * Check for security violations. 394 * Linux doesn't allow any changes to the PSL. 395 */ 396 if (context.sc_ps != ALPHA_PSL_USERMODE) 397 return(EINVAL); 398 399 p->p_md.md_tf->tf_regs[FRAME_PC] = context.sc_pc; 400 p->p_md.md_tf->tf_regs[FRAME_PS] = context.sc_ps; 401 402 regtoframe((struct reg *)context.sc_regs, p->p_md.md_tf); 403 alpha_pal_wrusp(context.sc_regs[R_SP]); 404 405 if (p == fpcurproc) 406 fpcurproc = NULL; 407 408 /* Restore fp regs and fpr_cr */ 409 bcopy((struct fpreg *)context.sc_fpregs, &p->p_addr->u_pcb.pcb_fp, 410 sizeof(struct fpreg)); 411 /* XXX sc_ownedfp ? */ 412 /* XXX sc_fp_control ? */ 413 414 #ifdef DEBUG 415 if (sigdebug & SDB_FOLLOW) 416 printf("linux_rt_sigreturn(%d): returns\n", p->p_pid); 417 #endif 418 return (EJUSTRETURN); 419 } 420 421 int 422 linux_sys_rt_sigreturn(p, v, retval) 423 struct proc *p; 424 void *v; 425 register_t *retval; 426 { 427 struct linux_sys_rt_sigreturn_args /* { 428 syscallarg(struct linux_rt_sigframe *) sfp; 429 } */ *uap = v; 430 struct linux_rt_sigframe *sfp, sigframe; 431 sigset_t mask; 432 433 /* 434 * The trampoline code hands us the context. 435 * It is unsafe to keep track of it ourselves, in the event that a 436 * program jumps out of a signal handler. 437 */ 438 439 sfp = SCARG(uap, sfp); 440 441 if (ALIGN(sfp) != (u_int64_t)sfp) 442 return(EINVAL); 443 444 /* 445 * Fetch the frame structure. 446 */ 447 if (copyin((caddr_t)sfp, &sigframe, 448 sizeof(struct linux_rt_sigframe)) != 0) 449 return (EFAULT); 450 451 /* Grab the signal mask */ 452 linux_to_native_sigset(&mask, &sigframe.uc.uc_sigmask); 453 454 return(linux_restore_sigcontext(p, sigframe.uc.uc_mcontext, &mask)); 455 } 456 457 458 int 459 linux_sys_sigreturn(p, v, retval) 460 struct proc *p; 461 void *v; 462 register_t *retval; 463 { 464 struct linux_sys_sigreturn_args /* { 465 syscallarg(struct linux_sigframe *) sfp; 466 } */ *uap = v; 467 struct linux_sigframe *sfp, frame; 468 sigset_t mask; 469 470 /* 471 * The trampoline code hands us the context. 472 * It is unsafe to keep track of it ourselves, in the event that a 473 * program jumps out of a signal handler. 474 */ 475 476 sfp = SCARG(uap, sfp); 477 if (ALIGN(sfp) != (u_int64_t)sfp) 478 return(EINVAL); 479 480 /* 481 * Fetch the frame structure. 482 */ 483 if (copyin((caddr_t)sfp, &frame, sizeof(struct linux_sigframe)) != 0) 484 return(EFAULT); 485 486 /* Grab the signal mask. */ 487 /* XXX use frame.extramask */ 488 linux_old_to_native_sigset(&mask, frame.sf_sc.sc_mask); 489 490 return(linux_restore_sigcontext(p, frame.sf_sc, &mask)); 491 } 492 493 /* 494 * We come here in a last attempt to satisfy a Linux ioctl() call 495 */ 496 /* XXX XAX update this, add maps, etc... */ 497 int 498 linux_machdepioctl(p, v, retval) 499 struct proc *p; 500 void *v; 501 register_t *retval; 502 { 503 struct linux_sys_ioctl_args /* { 504 syscallarg(int) fd; 505 syscallarg(u_long) com; 506 syscallarg(caddr_t) data; 507 } */ *uap = v; 508 struct sys_ioctl_args bia; 509 u_long com; 510 511 SCARG(&bia, fd) = SCARG(uap, fd); 512 SCARG(&bia, data) = SCARG(uap, data); 513 com = SCARG(uap, com); 514 515 switch (com) { 516 default: 517 printf("linux_machdepioctl: invalid ioctl %08lx\n", com); 518 return EINVAL; 519 } 520 SCARG(&bia, com) = com; 521 return sys_ioctl(p, &bia, retval); 522 } 523 524 /* XXX XAX fix this */ 525 dev_t 526 linux_fakedev(dev, raw) 527 dev_t dev; 528 int raw; 529 { 530 return dev; 531 } 532 533