linux_machdep.c revision 1.15.2.9
1 /* $NetBSD: linux_machdep.c,v 1.15.2.9 2002/05/29 21:32:29 nathanw 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 1.15.2.9 2002/05/29 21:32:29 nathanw 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/sa.h> 67 #include <sys/syscallargs.h> 68 #include <sys/filedesc.h> 69 #include <sys/exec_elf.h> 70 #include <sys/ioctl.h> 71 72 #include <uvm/uvm_extern.h> 73 74 #include <compat/linux/common/linux_types.h> 75 #include <compat/linux/common/linux_signal.h> 76 #include <compat/linux/common/linux_siginfo.h> 77 #include <compat/linux/common/linux_util.h> 78 #include <compat/linux/common/linux_ioctl.h> 79 #include <compat/linux/common/linux_exec.h> 80 #include <compat/linux/common/linux_machdep.h> 81 #include <compat/linux/common/linux_emuldata.h> 82 83 #include <compat/linux/linux_syscallargs.h> 84 85 #include <machine/alpha.h> 86 #include <machine/reg.h> 87 88 #if defined(_KERNEL_OPT) 89 #include "wsdisplay.h" 90 #endif 91 #if (NWSDISPLAY >0) 92 #include <dev/wscons/wsdisplay_usl_io.h> 93 #endif 94 #ifdef DEBUG 95 #include <machine/sigdebug.h> 96 #endif 97 98 /* 99 * Deal with some alpha-specific things in the Linux emulation code. 100 */ 101 102 void 103 linux_setregs(l, epp, stack) 104 struct lwp *l; 105 struct exec_package *epp; 106 u_long stack; 107 { 108 #ifdef DEBUG 109 struct trapframe *tfp = l->l_md.md_tf; 110 #endif 111 112 setregs(l, epp, stack); 113 #ifdef DEBUG 114 /* 115 * Linux has registers set to zero on entry; for DEBUG kernels 116 * the alpha setregs() fills registers with 0xbabefacedeadbeef. 117 */ 118 memset(tfp->tf_regs, 0, FRAME_SIZE * sizeof tfp->tf_regs[0]); 119 #endif 120 } 121 122 void setup_linux_rt_sigframe(tf, sig, mask) 123 struct trapframe *tf; 124 int sig; 125 sigset_t *mask; 126 { 127 struct lwp *l = curproc; 128 struct proc *p = l->l_proc; 129 struct linux_rt_sigframe *sfp, sigframe; 130 int onstack; 131 int fsize, rndfsize; 132 extern char linux_rt_sigcode[], linux_rt_esigcode[]; 133 134 /* Do we need to jump onto the signal stack? */ 135 onstack = (p->p_sigctx.ps_sigstk.ss_flags & (SS_DISABLE | SS_ONSTACK)) == 0 && 136 (SIGACTION(p, sig).sa_flags & SA_ONSTACK) != 0; 137 138 /* Allocate space for the signal handler context. */ 139 fsize = sizeof(struct linux_rt_sigframe); 140 rndfsize = ((fsize + 15) / 16) * 16; 141 142 if (onstack) 143 sfp = (struct linux_rt_sigframe *) 144 ((caddr_t)p->p_sigctx.ps_sigstk.ss_sp + 145 p->p_sigctx.ps_sigstk.ss_size); 146 else 147 sfp = (struct linux_rt_sigframe *)(alpha_pal_rdusp()); 148 sfp = (struct linux_rt_sigframe *)((caddr_t)sfp - rndfsize); 149 150 #ifdef DEBUG 151 if ((sigdebug & SDB_KSTACK) && (p->p_pid == sigpid)) 152 printf("linux_sendsig(%d): sig %d ssp %p usp %p\n", p->p_pid, 153 sig, &onstack, sfp); 154 #endif /* DEBUG */ 155 156 /* 157 * Build the signal context to be used by sigreturn. 158 */ 159 bzero(&sigframe.uc, sizeof(struct linux_ucontext)); 160 sigframe.uc.uc_mcontext.sc_onstack = onstack; 161 162 /* Setup potentially partial signal mask in sc_mask. */ 163 /* But get all of it in uc_sigmask */ 164 native_to_linux_old_sigset(&sigframe.uc.uc_mcontext.sc_mask, mask); 165 native_to_linux_sigset(&sigframe.uc.uc_sigmask, mask); 166 167 sigframe.uc.uc_mcontext.sc_pc = tf->tf_regs[FRAME_PC]; 168 sigframe.uc.uc_mcontext.sc_ps = ALPHA_PSL_USERMODE; 169 frametoreg(tf, (struct reg *)sigframe.uc.uc_mcontext.sc_regs); 170 sigframe.uc.uc_mcontext.sc_regs[R_SP] = alpha_pal_rdusp(); 171 172 alpha_enable_fp(l, 1); 173 sigframe.uc.uc_mcontext.sc_fpcr = alpha_read_fpcr(); 174 sigframe.uc.uc_mcontext.sc_fp_control = alpha_read_fp_c(l); 175 alpha_pal_wrfen(0); 176 177 sigframe.uc.uc_mcontext.sc_traparg_a0 = tf->tf_regs[FRAME_A0]; 178 sigframe.uc.uc_mcontext.sc_traparg_a1 = tf->tf_regs[FRAME_A1]; 179 sigframe.uc.uc_mcontext.sc_traparg_a2 = tf->tf_regs[FRAME_A2]; 180 181 /* 182 * XXX XAX Create bogus siginfo data. This can't really 183 * XXX be fixed until NetBSD has realtime signals. 184 * XXX Or we do the emuldata thing. 185 * XXX -erh 186 */ 187 bzero(&sigframe.info, sizeof(struct linux_siginfo)); 188 sigframe.info.lsi_signo = sig; 189 sigframe.info.lsi_code = LINUX_SI_USER; 190 sigframe.info.lsi_pid = p->p_pid; 191 sigframe.info.lsi_uid = p->p_ucred->cr_uid; /* Use real uid here? */ 192 193 if (copyout((caddr_t)&sigframe, (caddr_t)sfp, fsize) != 0) { 194 #ifdef DEBUG 195 if ((sigdebug & SDB_KSTACK) && p->p_pid == sigpid) 196 printf("sendsig(%d): copyout failed on sig %d\n", 197 p->p_pid, sig); 198 #endif 199 /* 200 * Process has trashed its stack; give it an illegal 201 * instruction to halt it in its tracks. 202 */ 203 sigexit(l, SIGILL); 204 /* NOTREACHED */ 205 } 206 207 /* Pass pointers to siginfo and ucontext in the regs */ 208 tf->tf_regs[FRAME_A1] = (unsigned long)&sfp->info; 209 tf->tf_regs[FRAME_A2] = (unsigned long)&sfp->uc; 210 211 /* Address of trampoline code. End up at this PC after mi_switch */ 212 tf->tf_regs[FRAME_PC] = 213 (u_int64_t)(p->p_psstr - (linux_rt_esigcode - linux_rt_sigcode)); 214 215 /* Adjust the stack */ 216 alpha_pal_wrusp((unsigned long)sfp); 217 218 /* Remember that we're now on the signal stack. */ 219 if (onstack) 220 p->p_sigctx.ps_sigstk.ss_flags |= SS_ONSTACK; 221 } 222 223 void setup_linux_sigframe(tf, sig, mask) 224 struct trapframe *tf; 225 int sig; 226 sigset_t *mask; 227 { 228 struct lwp *l = curproc; 229 struct proc *p = l->l_proc; 230 struct linux_sigframe *sfp, sigframe; 231 int onstack; 232 int fsize, rndfsize; 233 extern char linux_sigcode[], linux_esigcode[]; 234 235 /* Do we need to jump onto the signal stack? */ 236 onstack = (p->p_sigctx.ps_sigstk.ss_flags & (SS_DISABLE | SS_ONSTACK)) == 0 && 237 (SIGACTION(p, sig).sa_flags & SA_ONSTACK) != 0; 238 239 /* Allocate space for the signal handler context. */ 240 fsize = sizeof(struct linux_sigframe); 241 rndfsize = ((fsize + 15) / 16) * 16; 242 243 if (onstack) 244 sfp = (struct linux_sigframe *) 245 ((caddr_t)p->p_sigctx.ps_sigstk.ss_sp + 246 p->p_sigctx.ps_sigstk.ss_size); 247 else 248 sfp = (struct linux_sigframe *)(alpha_pal_rdusp()); 249 sfp = (struct linux_sigframe *)((caddr_t)sfp - rndfsize); 250 251 #ifdef DEBUG 252 if ((sigdebug & SDB_KSTACK) && (p->p_pid == sigpid)) 253 printf("linux_sendsig(%d): sig %d ssp %p usp %p\n", p->p_pid, 254 sig, &onstack, sfp); 255 #endif /* DEBUG */ 256 257 /* 258 * Build the signal context to be used by sigreturn. 259 */ 260 bzero(&sigframe.sf_sc, sizeof(struct linux_ucontext)); 261 sigframe.sf_sc.sc_onstack = onstack; 262 native_to_linux_old_sigset(&sigframe.sf_sc.sc_mask, mask); 263 sigframe.sf_sc.sc_pc = tf->tf_regs[FRAME_PC]; 264 sigframe.sf_sc.sc_ps = ALPHA_PSL_USERMODE; 265 frametoreg(tf, (struct reg *)sigframe.sf_sc.sc_regs); 266 sigframe.sf_sc.sc_regs[R_SP] = alpha_pal_rdusp(); 267 268 if (l == fpcurproc) { 269 alpha_pal_wrfen(1); 270 savefpstate(&l->l_addr->u_pcb.pcb_fp); 271 alpha_pal_wrfen(0); 272 sigframe.sf_sc.sc_fpcr = l->l_addr->u_pcb.pcb_fp.fpr_cr; 273 fpcurproc = NULL; 274 } 275 /* XXX ownedfp ? etc...? */ 276 277 sigframe.sf_sc.sc_traparg_a0 = tf->tf_regs[FRAME_A0]; 278 sigframe.sf_sc.sc_traparg_a1 = tf->tf_regs[FRAME_A1]; 279 sigframe.sf_sc.sc_traparg_a2 = tf->tf_regs[FRAME_A2]; 280 281 if (copyout((caddr_t)&sigframe, (caddr_t)sfp, fsize) != 0) { 282 #ifdef DEBUG 283 if ((sigdebug & SDB_KSTACK) && p->p_pid == sigpid) 284 printf("sendsig(%d): copyout failed on sig %d\n", 285 p->p_pid, sig); 286 #endif 287 /* 288 * Process has trashed its stack; give it an illegal 289 * instruction to halt it in its tracks. 290 */ 291 sigexit(l, SIGILL); 292 /* NOTREACHED */ 293 } 294 295 /* Pass pointers to sigcontext in the regs */ 296 tf->tf_regs[FRAME_A1] = 0; 297 tf->tf_regs[FRAME_A2] = (unsigned long)&sfp->sf_sc; 298 299 /* Address of trampoline code. End up at this PC after mi_switch */ 300 tf->tf_regs[FRAME_PC] = 301 (u_int64_t)(p->p_psstr - (linux_esigcode - linux_sigcode)); 302 303 /* Adjust the stack */ 304 alpha_pal_wrusp((unsigned long)sfp); 305 306 /* Remember that we're now on the signal stack. */ 307 if (onstack) 308 p->p_sigctx.ps_sigstk.ss_flags |= SS_ONSTACK; 309 } 310 311 /* 312 * Send an interrupt to process. 313 * 314 * Stack is set up to allow sigcode stored 315 * in u. to call routine, followed by kcall 316 * to sigreturn routine below. After sigreturn 317 * resets the signal mask, the stack, and the 318 * frame pointer, it returns to the user 319 * specified pc, psl. 320 */ 321 void 322 linux_sendsig(catcher, sig, mask, code) 323 sig_t catcher; 324 int sig; 325 sigset_t *mask; 326 u_long code; 327 { 328 struct lwp *l = curproc; 329 struct trapframe *tf = l->l_md.md_tf; 330 #ifdef notyet 331 struct linux_emuldata *edp; 332 333 /* Setup the signal frame (and part of the trapframe) */ 334 /*OLD: if (p->p_sigacts->ps_siginfo & sigmask(sig))*/ 335 /* XXX XAX this is broken now. need someplace to store what 336 XXX XAX kind of signal handler a signal has.*/ 337 #if 0 338 edp = (struct linux_emuldata *)p->p_emuldata; 339 #else 340 edp = 0; 341 #endif 342 if (edp && sigismember(&edp->ps_siginfo, sig)) 343 setup_linux_rt_sigframe(tf, sig, mask); 344 else 345 #endif /* notyet */ 346 setup_linux_sigframe(tf, sig, mask); 347 348 /* Signal handler for trampoline code */ 349 tf->tf_regs[FRAME_T12] = (u_int64_t)catcher; 350 tf->tf_regs[FRAME_A0] = native_to_linux_signo[sig]; 351 352 /* 353 * Linux has a custom restorer option. To support it we would 354 * need to store an array of restorers and a sigcode block 355 * which knew to use it. Doesn't seem worth the trouble. 356 * -erh 357 */ 358 359 #ifdef DEBUG 360 if (sigdebug & SDB_FOLLOW) 361 printf("sendsig(%d): pc %lx, catcher %lx\n", l->l_proc->p_pid, 362 tf->tf_regs[FRAME_PC], tf->tf_regs[FRAME_A3]); 363 if ((sigdebug & SDB_KSTACK) && l->l_proc->p_pid == sigpid) 364 printf("sendsig(%d): sig %d returns\n", l->l_proc->p_pid, sig); 365 #endif 366 } 367 368 /* 369 * System call to cleanup state after a signal 370 * has been taken. Reset signal mask and 371 * stack state from context left by sendsig (above). 372 * Return to previous pc as specified by context 373 * left by sendsig. 374 * Linux real-time signals use a different sigframe, 375 * but the sigcontext is the same. 376 */ 377 378 int 379 linux_restore_sigcontext(struct lwp *l, struct linux_sigcontext context, 380 sigset_t *mask) 381 { 382 383 struct proc *p = l->l_proc; 384 /* 385 * Linux doesn't (yet) have alternate signal stacks. 386 * However, the OSF/1 sigcontext which they use has 387 * an onstack member. This could be needed in the future. 388 */ 389 if (context.sc_onstack & LINUX_SA_ONSTACK) 390 p->p_sigctx.ps_sigstk.ss_flags |= SS_ONSTACK; 391 else 392 p->p_sigctx.ps_sigstk.ss_flags &= ~SS_ONSTACK; 393 394 /* Reset the signal mask */ 395 (void) sigprocmask1(p, SIG_SETMASK, mask, 0); 396 397 /* 398 * Check for security violations. 399 * Linux doesn't allow any changes to the PSL. 400 */ 401 if (context.sc_ps != ALPHA_PSL_USERMODE) 402 return(EINVAL); 403 404 l->l_md.md_tf->tf_regs[FRAME_PC] = context.sc_pc; 405 l->l_md.md_tf->tf_regs[FRAME_PS] = context.sc_ps; 406 407 regtoframe((struct reg *)context.sc_regs, l->l_md.md_tf); 408 alpha_pal_wrusp(context.sc_regs[R_SP]); 409 410 if (l == fpcurproc) 411 fpcurproc = NULL; 412 413 /* Restore fp regs and fpr_cr */ 414 bcopy((struct fpreg *)context.sc_fpregs, &l->l_addr->u_pcb.pcb_fp, 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(l, v, retval) 428 struct lwp *l; 429 void *v; 430 register_t *retval; 431 { 432 struct linux_sys_rt_sigreturn_args /* { 433 syscallarg(struct linux_rt_sigframe *) sfp; 434 } */ *uap = v; 435 struct linux_rt_sigframe *sfp, sigframe; 436 sigset_t mask; 437 438 /* 439 * The trampoline code hands us the context. 440 * It is unsafe to keep track of it ourselves, in the event that a 441 * program jumps out of a signal handler. 442 */ 443 444 sfp = SCARG(uap, sfp); 445 446 if (ALIGN(sfp) != (u_int64_t)sfp) 447 return(EINVAL); 448 449 /* 450 * Fetch the frame structure. 451 */ 452 if (copyin((caddr_t)sfp, &sigframe, 453 sizeof(struct linux_rt_sigframe)) != 0) 454 return (EFAULT); 455 456 /* Grab the signal mask */ 457 linux_to_native_sigset(&mask, &sigframe.uc.uc_sigmask); 458 459 return(linux_restore_sigcontext(l, sigframe.uc.uc_mcontext, &mask)); 460 } 461 462 463 int 464 linux_sys_sigreturn(l, v, retval) 465 struct lwp *l; 466 void *v; 467 register_t *retval; 468 { 469 struct linux_sys_sigreturn_args /* { 470 syscallarg(struct linux_sigframe *) sfp; 471 } */ *uap = v; 472 struct linux_sigframe *sfp, frame; 473 sigset_t mask; 474 475 /* 476 * The trampoline code hands us the context. 477 * It is unsafe to keep track of it ourselves, in the event that a 478 * program jumps out of a signal handler. 479 */ 480 481 sfp = SCARG(uap, sfp); 482 if (ALIGN(sfp) != (u_int64_t)sfp) 483 return(EINVAL); 484 485 /* 486 * Fetch the frame structure. 487 */ 488 if (copyin((caddr_t)sfp, &frame, sizeof(struct linux_sigframe)) != 0) 489 return(EFAULT); 490 491 /* Grab the signal mask. */ 492 /* XXX use frame.extramask */ 493 linux_old_to_native_sigset(&mask, frame.sf_sc.sc_mask); 494 495 return(linux_restore_sigcontext(l, frame.sf_sc, &mask)); 496 } 497 498 /* 499 * We come here in a last attempt to satisfy a Linux ioctl() call 500 */ 501 /* XXX XAX update this, add maps, etc... */ 502 int 503 linux_machdepioctl(p, v, retval) 504 struct proc *p; 505 void *v; 506 register_t *retval; 507 { 508 struct linux_sys_ioctl_args /* { 509 syscallarg(int) fd; 510 syscallarg(u_long) com; 511 syscallarg(caddr_t) data; 512 } */ *uap = v; 513 struct sys_ioctl_args bia; 514 u_long com; 515 516 SCARG(&bia, fd) = SCARG(uap, fd); 517 SCARG(&bia, data) = SCARG(uap, data); 518 com = SCARG(uap, com); 519 520 switch (com) { 521 default: 522 printf("linux_machdepioctl: invalid ioctl %08lx\n", com); 523 return EINVAL; 524 } 525 SCARG(&bia, com) = com; 526 /* XXX njwlwp */ 527 return sys_ioctl(curproc, &bia, retval); 528 } 529 530 /* XXX XAX fix this */ 531 dev_t 532 linux_fakedev(dev, raw) 533 dev_t dev; 534 int raw; 535 { 536 return dev; 537 } 538 539
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