linux_machdep.c revision 1.12
1 /* $NetBSD: linux_machdep.c,v 1.12 2000/11/29 22:05:36 jdolecek 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/param.h> 45 #include <sys/systm.h> 46 #include <sys/signalvar.h> 47 #include <sys/kernel.h> 48 #include <sys/map.h> 49 #include <sys/proc.h> 50 #include <sys/user.h> 51 #include <sys/buf.h> 52 #include <sys/reboot.h> 53 #include <sys/conf.h> 54 #include <sys/exec.h> 55 #include <sys/file.h> 56 #include <sys/callout.h> 57 #include <sys/malloc.h> 58 #include <sys/mbuf.h> 59 #include <sys/msgbuf.h> 60 #include <sys/mount.h> 61 #include <sys/vnode.h> 62 #include <sys/device.h> 63 #include <sys/syscallargs.h> 64 #include <sys/filedesc.h> 65 #include <sys/exec_elf.h> 66 67 #include <uvm/uvm_extern.h> 68 69 #include <compat/linux/common/linux_types.h> 70 #include <compat/linux/common/linux_signal.h> 71 #include <compat/linux/common/linux_siginfo.h> 72 #include <compat/linux/common/linux_util.h> 73 #include <compat/linux/common/linux_ioctl.h> 74 #include <compat/linux/common/linux_exec.h> 75 #include <compat/linux/common/linux_machdep.h> 76 #include <compat/linux/common/linux_emuldata.h> 77 78 #include <compat/linux/linux_syscallargs.h> 79 80 #include <machine/alpha.h> 81 #include <machine/reg.h> 82 83 #if defined(_KERNEL) && !defined(_LKM) 84 #include "wsdisplay.h" 85 #endif 86 #if (NWSDISPLAY >0) 87 #include <sys/ioctl.h> 88 #include <dev/wscons/wsdisplay_usl_io.h> 89 #endif 90 91 /* 92 * Deal with some alpha-specific things in the Linux emulation code. 93 */ 94 95 void 96 linux_setregs(p, epp, stack) 97 struct proc *p; 98 struct exec_package *epp; 99 u_long stack; 100 { 101 /* XXX XAX I think this is ok. not sure though. */ 102 setregs(p, epp, stack); 103 } 104 105 void setup_linux_rt_sigframe(tf, sig, mask) 106 struct trapframe *tf; 107 int sig; 108 sigset_t *mask; 109 { 110 struct proc *p = curproc; 111 struct linux_rt_sigframe *sfp, sigframe; 112 struct sigacts *psp = p->p_sigacts; 113 int onstack; 114 int fsize, rndfsize; 115 extern char linux_rt_sigcode[], linux_rt_esigcode[]; 116 117 /* Do we need to jump onto the signal stack? */ 118 onstack = (psp->ps_sigstk.ss_flags & (SS_DISABLE | SS_ONSTACK)) == 0 && 119 (psp->ps_sigact[sig].sa_flags & SA_ONSTACK) != 0; 120 121 /* Allocate space for the signal handler context. */ 122 fsize = sizeof(struct linux_rt_sigframe); 123 rndfsize = ((fsize + 15) / 16) * 16; 124 125 if (onstack) 126 sfp = (struct linux_rt_sigframe *) 127 ((caddr_t)psp->ps_sigstk.ss_sp + 128 psp->ps_sigstk.ss_size); 129 else 130 sfp = (struct linux_rt_sigframe *)(alpha_pal_rdusp()); 131 sfp = (struct linux_rt_sigframe *)((caddr_t)sfp - rndfsize); 132 133 #ifdef DEBUG 134 if ((sigdebug & SDB_KSTACK) && p->p_pid = sigpid) 135 printf("linux_sendsig(%d): sig %d ssp %p usp %p\n", p->p_pid, 136 sig, &onstack, sfp); 137 #endif /* DEBUG */ 138 139 /* 140 * Build the signal context to be used by sigreturn. 141 */ 142 bzero(&sigframe.uc, sizeof(struct linux_ucontext)); 143 sigframe.uc.uc_mcontext.sc_onstack = onstack; 144 145 /* Setup potentially partial signal mask in sc_mask. */ 146 /* But get all of it in uc_sigmask */ 147 native_to_linux_old_sigset(mask, &sigframe.uc.uc_mcontext.sc_mask); 148 native_to_linux_sigset(mask, &sigframe.uc.uc_sigmask); 149 150 sigframe.uc.uc_mcontext.sc_pc = tf->tf_regs[FRAME_PC]; 151 sigframe.uc.uc_mcontext.sc_ps = ALPHA_PSL_USERMODE; 152 frametoreg(tf, (struct reg *)sigframe.uc.uc_mcontext.sc_regs); 153 sigframe.uc.uc_mcontext.sc_regs[R_SP] = alpha_pal_rdusp(); 154 155 if (p == fpcurproc) { 156 alpha_pal_wrfen(1); 157 savefpstate(&p->p_addr->u_pcb.pcb_fp); 158 alpha_pal_wrfen(0); 159 sigframe.uc.uc_mcontext.sc_fpcr = p->p_addr->u_pcb.pcb_fp.fpr_cr; 160 fpcurproc = NULL; 161 } 162 /* XXX ownedfp ? etc...? */ 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 bzero(&sigframe.info, 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 = p->p_ucred->cr_uid; /* Use real uid here? */ 179 180 if (copyout((caddr_t)&sigframe, (caddr_t)sfp, fsize) != 0) { 181 #ifdef DEBUG 182 if ((sigdebug & SDB_KSTACK) && p->p_pid == sigpid) 183 printf("sendsig(%d): copyout failed on sig %d\n", 184 p->p_pid, sig); 185 #endif 186 /* 187 * Process has trashed its stack; give it an illegal 188 * instruction to halt it in its tracks. 189 */ 190 sigexit(p, SIGILL); 191 /* NOTREACHED */ 192 } 193 194 /* Pass pointers to siginfo and ucontext in the regs */ 195 tf->tf_regs[FRAME_A1] = (unsigned long)&sfp->info; 196 tf->tf_regs[FRAME_A2] = (unsigned long)&sfp->uc; 197 198 /* Address of trampoline code. End up at this PC after mi_switch */ 199 tf->tf_regs[FRAME_PC] = 200 (u_int64_t)(PS_STRINGS - (linux_rt_esigcode - linux_rt_sigcode)); 201 202 /* Adjust the stack */ 203 alpha_pal_wrusp((unsigned long)sfp); 204 205 /* Remember that we're now on the signal stack. */ 206 if (onstack) 207 psp->ps_sigstk.ss_flags |= SS_ONSTACK; 208 } 209 210 void setup_linux_sigframe(tf, sig, mask) 211 struct trapframe *tf; 212 int sig; 213 sigset_t *mask; 214 { 215 struct proc *p = curproc; 216 struct linux_sigframe *sfp, sigframe; 217 struct sigacts *psp = p->p_sigacts; 218 int onstack; 219 int fsize, rndfsize; 220 extern char linux_sigcode[], linux_esigcode[]; 221 222 /* Do we need to jump onto the signal stack? */ 223 onstack = (psp->ps_sigstk.ss_flags & (SS_DISABLE | SS_ONSTACK)) == 0 && 224 (psp->ps_sigact[sig].sa_flags & SA_ONSTACK) != 0; 225 226 /* Allocate space for the signal handler context. */ 227 fsize = sizeof(struct linux_sigframe); 228 rndfsize = ((fsize + 15) / 16) * 16; 229 230 if (onstack) 231 sfp = (struct linux_sigframe *) 232 ((caddr_t)psp->ps_sigstk.ss_sp + 233 psp->ps_sigstk.ss_size); 234 else 235 sfp = (struct linux_sigframe *)(alpha_pal_rdusp()); 236 sfp = (struct linux_sigframe *)((caddr_t)sfp - rndfsize); 237 238 #ifdef DEBUG 239 if ((sigdebug & SDB_KSTACK) && p->p_pid = sigpid) 240 printf("linux_sendsig(%d): sig %d ssp %p usp %p\n", p->p_pid, 241 sig, &onstack, sfp); 242 #endif /* DEBUG */ 243 244 /* 245 * Build the signal context to be used by sigreturn. 246 */ 247 bzero(&sigframe.sf_sc, sizeof(struct linux_ucontext)); 248 sigframe.sf_sc.sc_onstack = onstack; 249 native_to_linux_old_sigset(mask, &sigframe.sf_sc.sc_mask); 250 sigframe.sf_sc.sc_pc = tf->tf_regs[FRAME_PC]; 251 sigframe.sf_sc.sc_ps = ALPHA_PSL_USERMODE; 252 frametoreg(tf, (struct reg *)sigframe.sf_sc.sc_regs); 253 sigframe.sf_sc.sc_regs[R_SP] = alpha_pal_rdusp(); 254 255 if (p == fpcurproc) { 256 alpha_pal_wrfen(1); 257 savefpstate(&p->p_addr->u_pcb.pcb_fp); 258 alpha_pal_wrfen(0); 259 sigframe.sf_sc.sc_fpcr = p->p_addr->u_pcb.pcb_fp.fpr_cr; 260 fpcurproc = NULL; 261 } 262 /* XXX ownedfp ? etc...? */ 263 264 sigframe.sf_sc.sc_traparg_a0 = tf->tf_regs[FRAME_A0]; 265 sigframe.sf_sc.sc_traparg_a1 = tf->tf_regs[FRAME_A1]; 266 sigframe.sf_sc.sc_traparg_a2 = tf->tf_regs[FRAME_A2]; 267 268 if (copyout((caddr_t)&sigframe, (caddr_t)sfp, fsize) != 0) { 269 #ifdef DEBUG 270 if ((sigdebug & SDB_KSTACK) && p->p_pid == sigpid) 271 printf("sendsig(%d): copyout failed on sig %d\n", 272 p->p_pid, sig); 273 #endif 274 /* 275 * Process has trashed its stack; give it an illegal 276 * instruction to halt it in its tracks. 277 */ 278 sigexit(p, SIGILL); 279 /* NOTREACHED */ 280 } 281 282 /* Pass pointers to sigcontext in the regs */ 283 tf->tf_regs[FRAME_A1] = 0; 284 tf->tf_regs[FRAME_A2] = (unsigned long)&sfp->sf_sc; 285 286 /* Address of trampoline code. End up at this PC after mi_switch */ 287 tf->tf_regs[FRAME_PC] = 288 (u_int64_t)(PS_STRINGS - (linux_esigcode - linux_sigcode)); 289 290 /* Adjust the stack */ 291 alpha_pal_wrusp((unsigned long)sfp); 292 293 /* Remember that we're now on the signal stack. */ 294 if (onstack) 295 psp->ps_sigstk.ss_flags |= SS_ONSTACK; 296 } 297 298 /* 299 * Send an interrupt to process. 300 * 301 * Stack is set up to allow sigcode stored 302 * in u. to call routine, followed by kcall 303 * to sigreturn routine below. After sigreturn 304 * resets the signal mask, the stack, and the 305 * frame pointer, it returns to the user 306 * specified pc, psl. 307 */ 308 void 309 linux_sendsig(catcher, sig, mask, code) 310 sig_t catcher; 311 int sig; 312 sigset_t *mask; 313 u_long code; 314 { 315 struct proc *p = curproc; 316 struct trapframe *tf = p->p_md.md_tf; 317 #ifdef notyet 318 struct linux_emuldata *edp; 319 320 /* Setup the signal frame (and part of the trapframe) */ 321 /*OLD: if (p->p_sigacts->ps_siginfo & sigmask(sig))*/ 322 /* XXX XAX this is broken now. need someplace to store what 323 XXX XAX kind of signal handler a signal has.*/ 324 #if 0 325 edp = (struct linux_emuldata *)p->p_emuldata; 326 #else 327 edp = 0; 328 #endif 329 if (edp && sigismember(&edp->ps_siginfo, sig)) 330 setup_linux_rt_sigframe(tf, sig, mask); 331 else 332 #endif /* notyet */ 333 setup_linux_sigframe(tf, sig, mask); 334 335 /* Signal handler for trampoline code */ 336 tf->tf_regs[FRAME_T12] = (u_int64_t)catcher; 337 tf->tf_regs[FRAME_A0] = native_to_linux_sig[sig]; 338 339 /* 340 * Linux has a custom restorer option. To support it we would 341 * need to store an array of restorers and a sigcode block 342 * which knew to use it. Doesn't seem worth the trouble. 343 * -erh 344 */ 345 346 #ifdef DEBUG 347 if (sigdebug & SDB_FOLLOW) 348 printf("sendsig(%d): pc %lx, catcher %lx\n", p->p_pid, 349 tf->tf_regs[FRAME_PC], tf->tf_regs[FRAME_A3]); 350 if ((sigdebug & SDB_KSTACK) && p->p_pid == sigpid) 351 printf("sendsig(%d): sig %d returns\n", p->p_pid, sig); 352 #endif 353 } 354 355 /* 356 * System call to cleanup state after a signal 357 * has been taken. Reset signal mask and 358 * stack state from context left by sendsig (above). 359 * Return to previous pc as specified by context 360 * left by sendsig. 361 * Linux real-time signals use a different sigframe, 362 * but the sigcontext is the same. 363 */ 364 365 int 366 linux_restore_sigcontext(struct proc *p, struct linux_sigcontext context, 367 sigset_t *mask) 368 { 369 370 /* 371 * Linux doesn't (yet) have alternate signal stacks. 372 * However, the OSF/1 sigcontext which they use has 373 * an onstack member. This could be needed in the future. 374 */ 375 if (context.sc_onstack & LINUX_SA_ONSTACK) 376 p->p_sigacts->ps_sigstk.ss_flags |= SS_ONSTACK; 377 else 378 p->p_sigacts->ps_sigstk.ss_flags &= ~SS_ONSTACK; 379 380 /* Reset the signal mask */ 381 (void) sigprocmask1(p, SIG_SETMASK, mask, 0); 382 383 /* 384 * Check for security violations. 385 * Linux doesn't allow any changes to the PSL. 386 */ 387 if (context.sc_ps != ALPHA_PSL_USERMODE) 388 return(EINVAL); 389 390 p->p_md.md_tf->tf_regs[FRAME_PC] = context.sc_pc; 391 p->p_md.md_tf->tf_regs[FRAME_PS] = context.sc_ps; 392 393 regtoframe((struct reg *)context.sc_regs, p->p_md.md_tf); 394 alpha_pal_wrusp(context.sc_regs[R_SP]); 395 396 if (p == fpcurproc) 397 fpcurproc = NULL; 398 399 /* Restore fp regs and fpr_cr */ 400 bcopy((struct fpreg *)context.sc_fpregs, &p->p_addr->u_pcb.pcb_fp, 401 sizeof(struct fpreg)); 402 /* XXX sc_ownedfp ? */ 403 /* XXX sc_fp_control ? */ 404 405 #ifdef DEBUG 406 if (sigdebug & SDB_FOLLOW) 407 printf("linux_rt_sigreturn(%d): returns\n", p->pid); 408 #endif 409 return (EJUSTRETURN); 410 } 411 412 int 413 linux_sys_rt_sigreturn(p, v, retval) 414 struct proc *p; 415 void *v; 416 register_t *retval; 417 { 418 struct linux_sys_rt_sigreturn_args /* { 419 syscallarg(struct linux_rt_sigframe *) sfp; 420 } */ *uap = v; 421 struct linux_rt_sigframe *sfp, sigframe; 422 sigset_t mask; 423 424 /* 425 * The trampoline code hands us the context. 426 * It is unsafe to keep track of it ourselves, in the event that a 427 * program jumps out of a signal handler. 428 */ 429 430 sfp = SCARG(uap, sfp); 431 432 if (ALIGN(sfp) != (u_int64_t)sfp) 433 return(EINVAL); 434 435 /* 436 * Fetch the frame structure. 437 */ 438 if (copyin((caddr_t)sfp, &sigframe, 439 sizeof(struct linux_rt_sigframe)) != 0) 440 return (EFAULT); 441 442 /* Grab the signal mask */ 443 linux_to_native_sigset(&sigframe.uc.uc_sigmask, &mask); 444 445 return(linux_restore_sigcontext(p, sigframe.uc.uc_mcontext, &mask)); 446 } 447 448 449 int 450 linux_sys_sigreturn(p, v, retval) 451 struct proc *p; 452 void *v; 453 register_t *retval; 454 { 455 struct linux_sys_sigreturn_args /* { 456 syscallarg(struct linux_sigframe *) sfp; 457 } */ *uap = v; 458 struct linux_sigframe *sfp, frame; 459 sigset_t mask; 460 461 /* 462 * The trampoline code hands us the context. 463 * It is unsafe to keep track of it ourselves, in the event that a 464 * program jumps out of a signal handler. 465 */ 466 467 sfp = SCARG(uap, sfp); 468 if (ALIGN(sfp) != (u_int64_t)sfp) 469 return(EINVAL); 470 471 /* 472 * Fetch the frame structure. 473 */ 474 if (copyin((caddr_t)sfp, &frame, sizeof(struct linux_sigframe)) != 0) 475 return(EFAULT); 476 477 /* Grab the signal mask. */ 478 /* XXX use frame.extramask */ 479 linux_old_to_native_sigset(frame.sf_sc.sc_mask, &mask); 480 481 return(linux_restore_sigcontext(p, frame.sf_sc, &mask)); 482 } 483 484 /* 485 * We come here in a last attempt to satisfy a Linux ioctl() call 486 */ 487 /* XXX XAX update this, add maps, etc... */ 488 int 489 linux_machdepioctl(p, v, retval) 490 struct proc *p; 491 void *v; 492 register_t *retval; 493 { 494 struct linux_sys_ioctl_args /* { 495 syscallarg(int) fd; 496 syscallarg(u_long) com; 497 syscallarg(caddr_t) data; 498 } */ *uap = v; 499 struct sys_ioctl_args bia; 500 u_long com; 501 502 SCARG(&bia, fd) = SCARG(uap, fd); 503 SCARG(&bia, data) = SCARG(uap, data); 504 com = SCARG(uap, com); 505 506 switch (com) { 507 default: 508 printf("linux_machdepioctl: invalid ioctl %08lx\n", com); 509 return EINVAL; 510 } 511 SCARG(&bia, com) = com; 512 return sys_ioctl(p, &bia, retval); 513 } 514 515 /* XXX XAX fix this */ 516 dev_t 517 linux_fakedev(dev) 518 dev_t dev; 519 { 520 return dev; 521 } 522 523
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