1 /* $NetBSD: linux_machdep.c,v 1.23 2002/03/31 22:22:45 christos 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 1.23 2002/03/31 22:22:45 christos 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/map.h> 52 #include <sys/proc.h> 53 #include <sys/user.h> 54 #include <sys/buf.h> 55 #include <sys/reboot.h> 56 #include <sys/conf.h> 57 #include <sys/exec.h> 58 #include <sys/file.h> 59 #include <sys/callout.h> 60 #include <sys/malloc.h> 61 #include <sys/mbuf.h> 62 #include <sys/msgbuf.h> 63 #include <sys/mount.h> 64 #include <sys/vnode.h> 65 #include <sys/device.h> 66 #include <sys/syscallargs.h> 67 #include <sys/filedesc.h> 68 #include <sys/exec_elf.h> 69 #include <sys/ioctl.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(p, epp, stack) 103 struct proc *p; 104 struct exec_package *epp; 105 u_long stack; 106 { 107 #ifdef DEBUG 108 struct trapframe *tfp = p->p_md.md_tf; 109 #endif 110 111 setregs(p, 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 setup_linux_rt_sigframe(tf, sig, mask) 122 struct trapframe *tf; 123 int sig; 124 sigset_t *mask; 125 { 126 struct proc *p = curproc; 127 struct linux_rt_sigframe *sfp, sigframe; 128 int onstack; 129 int fsize, rndfsize; 130 extern char linux_rt_sigcode[], linux_rt_esigcode[]; 131 132 /* Do we need to jump onto the signal stack? */ 133 onstack = (p->p_sigctx.ps_sigstk.ss_flags & (SS_DISABLE | SS_ONSTACK)) == 0 && 134 (SIGACTION(p, sig).sa_flags & SA_ONSTACK) != 0; 135 136 /* Allocate space for the signal handler context. */ 137 fsize = sizeof(struct linux_rt_sigframe); 138 rndfsize = ((fsize + 15) / 16) * 16; 139 140 if (onstack) 141 sfp = (struct linux_rt_sigframe *) 142 ((caddr_t)p->p_sigctx.ps_sigstk.ss_sp + 143 p->p_sigctx.ps_sigstk.ss_size); 144 else 145 sfp = (struct linux_rt_sigframe *)(alpha_pal_rdusp()); 146 sfp = (struct linux_rt_sigframe *)((caddr_t)sfp - rndfsize); 147 148 #ifdef DEBUG 149 if ((sigdebug & SDB_KSTACK) && (p->p_pid == sigpid)) 150 printf("linux_sendsig(%d): sig %d ssp %p usp %p\n", p->p_pid, 151 sig, &onstack, sfp); 152 #endif /* DEBUG */ 153 154 /* 155 * Build the signal context to be used by sigreturn. 156 */ 157 bzero(&sigframe.uc, sizeof(struct linux_ucontext)); 158 sigframe.uc.uc_mcontext.sc_onstack = onstack; 159 160 /* Setup potentially partial signal mask in sc_mask. */ 161 /* But get all of it in uc_sigmask */ 162 native_to_linux_old_sigset(&sigframe.uc.uc_mcontext.sc_mask, mask); 163 native_to_linux_sigset(&sigframe.uc.uc_sigmask, mask); 164 165 sigframe.uc.uc_mcontext.sc_pc = tf->tf_regs[FRAME_PC]; 166 sigframe.uc.uc_mcontext.sc_ps = ALPHA_PSL_USERMODE; 167 frametoreg(tf, (struct reg *)sigframe.uc.uc_mcontext.sc_regs); 168 sigframe.uc.uc_mcontext.sc_regs[R_SP] = alpha_pal_rdusp(); 169 170 alpha_enable_fp(p, 1); 171 sigframe.uc.uc_mcontext.sc_fpcr = alpha_read_fpcr(); 172 sigframe.uc.uc_mcontext.sc_fp_control = alpha_read_fp_c(p); 173 alpha_pal_wrfen(0); 174 175 sigframe.uc.uc_mcontext.sc_traparg_a0 = tf->tf_regs[FRAME_A0]; 176 sigframe.uc.uc_mcontext.sc_traparg_a1 = tf->tf_regs[FRAME_A1]; 177 sigframe.uc.uc_mcontext.sc_traparg_a2 = tf->tf_regs[FRAME_A2]; 178 179 /* 180 * XXX XAX Create bogus siginfo data. This can't really 181 * XXX be fixed until NetBSD has realtime signals. 182 * XXX Or we do the emuldata thing. 183 * XXX -erh 184 */ 185 bzero(&sigframe.info, sizeof(struct linux_siginfo)); 186 sigframe.info.lsi_signo = sig; 187 sigframe.info.lsi_code = LINUX_SI_USER; 188 sigframe.info.lsi_pid = p->p_pid; 189 sigframe.info.lsi_uid = p->p_ucred->cr_uid; /* Use real uid here? */ 190 191 if (copyout((caddr_t)&sigframe, (caddr_t)sfp, fsize) != 0) { 192 #ifdef DEBUG 193 if ((sigdebug & SDB_KSTACK) && p->p_pid == sigpid) 194 printf("sendsig(%d): copyout failed on sig %d\n", 195 p->p_pid, sig); 196 #endif 197 /* 198 * Process has trashed its stack; give it an illegal 199 * instruction to halt it in its tracks. 200 */ 201 sigexit(p, SIGILL); 202 /* NOTREACHED */ 203 } 204 205 /* Pass pointers to siginfo and ucontext in the regs */ 206 tf->tf_regs[FRAME_A1] = (unsigned long)&sfp->info; 207 tf->tf_regs[FRAME_A2] = (unsigned long)&sfp->uc; 208 209 /* Address of trampoline code. End up at this PC after mi_switch */ 210 tf->tf_regs[FRAME_PC] = 211 (u_int64_t)(p->p_psstr - (linux_rt_esigcode - linux_rt_sigcode)); 212 213 /* Adjust the stack */ 214 alpha_pal_wrusp((unsigned long)sfp); 215 216 /* Remember that we're now on the signal stack. */ 217 if (onstack) 218 p->p_sigctx.ps_sigstk.ss_flags |= SS_ONSTACK; 219 } 220 221 void setup_linux_sigframe(tf, sig, mask) 222 struct trapframe *tf; 223 int sig; 224 sigset_t *mask; 225 { 226 struct proc *p = curproc; 227 struct linux_sigframe *sfp, sigframe; 228 int onstack; 229 int fsize, rndfsize; 230 extern char linux_sigcode[], linux_esigcode[]; 231 232 /* Do we need to jump onto the signal stack? */ 233 onstack = (p->p_sigctx.ps_sigstk.ss_flags & (SS_DISABLE | SS_ONSTACK)) == 0 && 234 (SIGACTION(p, sig).sa_flags & SA_ONSTACK) != 0; 235 236 /* Allocate space for the signal handler context. */ 237 fsize = sizeof(struct linux_sigframe); 238 rndfsize = ((fsize + 15) / 16) * 16; 239 240 if (onstack) 241 sfp = (struct linux_sigframe *) 242 ((caddr_t)p->p_sigctx.ps_sigstk.ss_sp + 243 p->p_sigctx.ps_sigstk.ss_size); 244 else 245 sfp = (struct linux_sigframe *)(alpha_pal_rdusp()); 246 sfp = (struct linux_sigframe *)((caddr_t)sfp - rndfsize); 247 248 #ifdef DEBUG 249 if ((sigdebug & SDB_KSTACK) && (p->p_pid == sigpid)) 250 printf("linux_sendsig(%d): sig %d ssp %p usp %p\n", p->p_pid, 251 sig, &onstack, sfp); 252 #endif /* DEBUG */ 253 254 /* 255 * Build the signal context to be used by sigreturn. 256 */ 257 bzero(&sigframe.sf_sc, sizeof(struct linux_ucontext)); 258 sigframe.sf_sc.sc_onstack = onstack; 259 native_to_linux_old_sigset(&sigframe.sf_sc.sc_mask, mask); 260 sigframe.sf_sc.sc_pc = tf->tf_regs[FRAME_PC]; 261 sigframe.sf_sc.sc_ps = ALPHA_PSL_USERMODE; 262 frametoreg(tf, (struct reg *)sigframe.sf_sc.sc_regs); 263 sigframe.sf_sc.sc_regs[R_SP] = alpha_pal_rdusp(); 264 265 if (p == fpcurproc) { 266 alpha_pal_wrfen(1); 267 savefpstate(&p->p_addr->u_pcb.pcb_fp); 268 alpha_pal_wrfen(0); 269 sigframe.sf_sc.sc_fpcr = p->p_addr->u_pcb.pcb_fp.fpr_cr; 270 fpcurproc = NULL; 271 } 272 /* XXX ownedfp ? etc...? */ 273 274 sigframe.sf_sc.sc_traparg_a0 = tf->tf_regs[FRAME_A0]; 275 sigframe.sf_sc.sc_traparg_a1 = tf->tf_regs[FRAME_A1]; 276 sigframe.sf_sc.sc_traparg_a2 = tf->tf_regs[FRAME_A2]; 277 278 if (copyout((caddr_t)&sigframe, (caddr_t)sfp, fsize) != 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(p, 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_psstr - (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 p->p_sigctx.ps_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(catcher, sig, mask, code) 320 sig_t catcher; 321 int sig; 322 sigset_t *mask; 323 u_long code; 324 { 325 struct proc *p = curproc; 326 struct trapframe *tf = p->p_md.md_tf; 327 #ifdef notyet 328 struct linux_emuldata *edp; 329 330 /* Setup the signal frame (and part of the trapframe) */ 331 /*OLD: if (p->p_sigacts->ps_siginfo & sigmask(sig))*/ 332 /* XXX XAX this is broken now. need someplace to store what 333 XXX XAX kind of signal handler a signal has.*/ 334 #if 0 335 edp = (struct linux_emuldata *)p->p_emuldata; 336 #else 337 edp = 0; 338 #endif 339 if (edp && sigismember(&edp->ps_siginfo, sig)) 340 setup_linux_rt_sigframe(tf, sig, mask); 341 else 342 #endif /* notyet */ 343 setup_linux_sigframe(tf, sig, mask); 344 345 /* Signal handler for trampoline code */ 346 tf->tf_regs[FRAME_T12] = (u_int64_t)catcher; 347 tf->tf_regs[FRAME_A0] = native_to_linux_signo[sig]; 348 349 /* 350 * Linux has a custom restorer option. To support it we would 351 * need to store an array of restorers and a sigcode block 352 * which knew to use it. Doesn't seem worth the trouble. 353 * -erh 354 */ 355 356 #ifdef DEBUG 357 if (sigdebug & SDB_FOLLOW) 358 printf("sendsig(%d): pc %lx, catcher %lx\n", p->p_pid, 359 tf->tf_regs[FRAME_PC], tf->tf_regs[FRAME_A3]); 360 if ((sigdebug & SDB_KSTACK) && p->p_pid == sigpid) 361 printf("sendsig(%d): sig %d returns\n", p->p_pid, sig); 362 #endif 363 } 364 365 /* 366 * System call to cleanup state after a signal 367 * has been taken. Reset signal mask and 368 * stack state from context left by sendsig (above). 369 * Return to previous pc as specified by context 370 * left by sendsig. 371 * Linux real-time signals use a different sigframe, 372 * but the sigcontext is the same. 373 */ 374 375 int 376 linux_restore_sigcontext(struct proc *p, struct linux_sigcontext context, 377 sigset_t *mask) 378 { 379 380 /* 381 * Linux doesn't (yet) have alternate signal stacks. 382 * However, the OSF/1 sigcontext which they use has 383 * an onstack member. This could be needed in the future. 384 */ 385 if (context.sc_onstack & LINUX_SA_ONSTACK) 386 p->p_sigctx.ps_sigstk.ss_flags |= SS_ONSTACK; 387 else 388 p->p_sigctx.ps_sigstk.ss_flags &= ~SS_ONSTACK; 389 390 /* Reset the signal mask */ 391 (void) sigprocmask1(p, SIG_SETMASK, mask, 0); 392 393 /* 394 * Check for security violations. 395 * Linux doesn't allow any changes to the PSL. 396 */ 397 if (context.sc_ps != ALPHA_PSL_USERMODE) 398 return(EINVAL); 399 400 p->p_md.md_tf->tf_regs[FRAME_PC] = context.sc_pc; 401 p->p_md.md_tf->tf_regs[FRAME_PS] = context.sc_ps; 402 403 regtoframe((struct reg *)context.sc_regs, p->p_md.md_tf); 404 alpha_pal_wrusp(context.sc_regs[R_SP]); 405 406 if (p == fpcurproc) 407 fpcurproc = NULL; 408 409 /* Restore fp regs and fpr_cr */ 410 bcopy((struct fpreg *)context.sc_fpregs, &p->p_addr->u_pcb.pcb_fp, 411 sizeof(struct fpreg)); 412 /* XXX sc_ownedfp ? */ 413 /* XXX sc_fp_control ? */ 414 415 #ifdef DEBUG 416 if (sigdebug & SDB_FOLLOW) 417 printf("linux_rt_sigreturn(%d): returns\n", p->p_pid); 418 #endif 419 return (EJUSTRETURN); 420 } 421 422 int 423 linux_sys_rt_sigreturn(p, v, retval) 424 struct proc *p; 425 void *v; 426 register_t *retval; 427 { 428 struct linux_sys_rt_sigreturn_args /* { 429 syscallarg(struct linux_rt_sigframe *) sfp; 430 } */ *uap = v; 431 struct linux_rt_sigframe *sfp, sigframe; 432 sigset_t mask; 433 434 /* 435 * The trampoline code hands us the context. 436 * It is unsafe to keep track of it ourselves, in the event that a 437 * program jumps out of a signal handler. 438 */ 439 440 sfp = SCARG(uap, sfp); 441 442 if (ALIGN(sfp) != (u_int64_t)sfp) 443 return(EINVAL); 444 445 /* 446 * Fetch the frame structure. 447 */ 448 if (copyin((caddr_t)sfp, &sigframe, 449 sizeof(struct linux_rt_sigframe)) != 0) 450 return (EFAULT); 451 452 /* Grab the signal mask */ 453 linux_to_native_sigset(&mask, &sigframe.uc.uc_sigmask); 454 455 return(linux_restore_sigcontext(p, sigframe.uc.uc_mcontext, &mask)); 456 } 457 458 459 int 460 linux_sys_sigreturn(p, v, retval) 461 struct proc *p; 462 void *v; 463 register_t *retval; 464 { 465 struct linux_sys_sigreturn_args /* { 466 syscallarg(struct linux_sigframe *) sfp; 467 } */ *uap = v; 468 struct linux_sigframe *sfp, frame; 469 sigset_t mask; 470 471 /* 472 * The trampoline code hands us the context. 473 * It is unsafe to keep track of it ourselves, in the event that a 474 * program jumps out of a signal handler. 475 */ 476 477 sfp = SCARG(uap, sfp); 478 if (ALIGN(sfp) != (u_int64_t)sfp) 479 return(EINVAL); 480 481 /* 482 * Fetch the frame structure. 483 */ 484 if (copyin((caddr_t)sfp, &frame, sizeof(struct linux_sigframe)) != 0) 485 return(EFAULT); 486 487 /* Grab the signal mask. */ 488 /* XXX use frame.extramask */ 489 linux_old_to_native_sigset(&mask, frame.sf_sc.sc_mask); 490 491 return(linux_restore_sigcontext(p, frame.sf_sc, &mask)); 492 } 493 494 /* 495 * We come here in a last attempt to satisfy a Linux ioctl() call 496 */ 497 /* XXX XAX update this, add maps, etc... */ 498 int 499 linux_machdepioctl(p, v, retval) 500 struct proc *p; 501 void *v; 502 register_t *retval; 503 { 504 struct linux_sys_ioctl_args /* { 505 syscallarg(int) fd; 506 syscallarg(u_long) com; 507 syscallarg(caddr_t) data; 508 } */ *uap = v; 509 struct sys_ioctl_args bia; 510 u_long com; 511 512 SCARG(&bia, fd) = SCARG(uap, fd); 513 SCARG(&bia, data) = SCARG(uap, data); 514 com = SCARG(uap, com); 515 516 switch (com) { 517 default: 518 printf("linux_machdepioctl: invalid ioctl %08lx\n", com); 519 return EINVAL; 520 } 521 SCARG(&bia, com) = com; 522 return sys_ioctl(p, &bia, retval); 523 } 524 525 /* XXX XAX fix this */ 526 dev_t 527 linux_fakedev(dev, raw) 528 dev_t dev; 529 int raw; 530 { 531 return dev; 532 } 533 534