linux_machdep.c revision 1.15.2.5
1 /* $NetBSD: linux_machdep.c,v 1.15.2.5 2001/11/14 19:13:02 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 1.15.2.5 2001/11/14 19:13:02 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/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(l, epp, stack) 103 struct lwp *l; 104 struct exec_package *epp; 105 u_long stack; 106 { 107 #ifdef DEBUG 108 struct trapframe *tfp = l->l_md.md_tf; 109 #endif 110 111 setregs(l, 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 lwp *l = curproc; 127 struct proc *p = l->l_proc; 128 struct linux_rt_sigframe *sfp, sigframe; 129 int onstack; 130 int fsize, rndfsize; 131 extern char linux_rt_sigcode[], linux_rt_esigcode[]; 132 133 /* Do we need to jump onto the signal stack? */ 134 onstack = (p->p_sigctx.ps_sigstk.ss_flags & (SS_DISABLE | SS_ONSTACK)) == 0 && 135 (SIGACTION(p, sig).sa_flags & SA_ONSTACK) != 0; 136 137 /* Allocate space for the signal handler context. */ 138 fsize = sizeof(struct linux_rt_sigframe); 139 rndfsize = ((fsize + 15) / 16) * 16; 140 141 if (onstack) 142 sfp = (struct linux_rt_sigframe *) 143 ((caddr_t)p->p_sigctx.ps_sigstk.ss_sp + 144 p->p_sigctx.ps_sigstk.ss_size); 145 else 146 sfp = (struct linux_rt_sigframe *)(alpha_pal_rdusp()); 147 sfp = (struct linux_rt_sigframe *)((caddr_t)sfp - rndfsize); 148 149 #ifdef DEBUG 150 if ((sigdebug & SDB_KSTACK) && (p->p_pid == sigpid)) 151 printf("linux_sendsig(%d): sig %d ssp %p usp %p\n", p->p_pid, 152 sig, &onstack, sfp); 153 #endif /* DEBUG */ 154 155 /* 156 * Build the signal context to be used by sigreturn. 157 */ 158 bzero(&sigframe.uc, sizeof(struct linux_ucontext)); 159 sigframe.uc.uc_mcontext.sc_onstack = onstack; 160 161 /* Setup potentially partial signal mask in sc_mask. */ 162 /* But get all of it in uc_sigmask */ 163 native_to_linux_old_sigset(mask, &sigframe.uc.uc_mcontext.sc_mask); 164 native_to_linux_sigset(mask, &sigframe.uc.uc_sigmask); 165 166 sigframe.uc.uc_mcontext.sc_pc = tf->tf_regs[FRAME_PC]; 167 sigframe.uc.uc_mcontext.sc_ps = ALPHA_PSL_USERMODE; 168 frametoreg(tf, (struct reg *)sigframe.uc.uc_mcontext.sc_regs); 169 sigframe.uc.uc_mcontext.sc_regs[R_SP] = alpha_pal_rdusp(); 170 171 alpha_enable_fp(l, 1); 172 sigframe.uc.uc_mcontext.sc_fpcr = alpha_read_fpcr(); 173 sigframe.uc.uc_mcontext.sc_fp_control = alpha_read_fp_c(l); 174 alpha_pal_wrfen(0); 175 176 sigframe.uc.uc_mcontext.sc_traparg_a0 = tf->tf_regs[FRAME_A0]; 177 sigframe.uc.uc_mcontext.sc_traparg_a1 = tf->tf_regs[FRAME_A1]; 178 sigframe.uc.uc_mcontext.sc_traparg_a2 = tf->tf_regs[FRAME_A2]; 179 180 /* 181 * XXX XAX Create bogus siginfo data. This can't really 182 * XXX be fixed until NetBSD has realtime signals. 183 * XXX Or we do the emuldata thing. 184 * XXX -erh 185 */ 186 bzero(&sigframe.info, sizeof(struct linux_siginfo)); 187 sigframe.info.lsi_signo = sig; 188 sigframe.info.lsi_code = LINUX_SI_USER; 189 sigframe.info.lsi_pid = p->p_pid; 190 sigframe.info.lsi_uid = p->p_ucred->cr_uid; /* Use real uid here? */ 191 192 if (copyout((caddr_t)&sigframe, (caddr_t)sfp, fsize) != 0) { 193 #ifdef DEBUG 194 if ((sigdebug & SDB_KSTACK) && p->p_pid == sigpid) 195 printf("sendsig(%d): copyout failed on sig %d\n", 196 p->p_pid, sig); 197 #endif 198 /* 199 * Process has trashed its stack; give it an illegal 200 * instruction to halt it in its tracks. 201 */ 202 sigexit(l, SIGILL); 203 /* NOTREACHED */ 204 } 205 206 /* Pass pointers to siginfo and ucontext in the regs */ 207 tf->tf_regs[FRAME_A1] = (unsigned long)&sfp->info; 208 tf->tf_regs[FRAME_A2] = (unsigned long)&sfp->uc; 209 210 /* Address of trampoline code. End up at this PC after mi_switch */ 211 tf->tf_regs[FRAME_PC] = 212 (u_int64_t)(PS_STRINGS - (linux_rt_esigcode - linux_rt_sigcode)); 213 214 /* Adjust the stack */ 215 alpha_pal_wrusp((unsigned long)sfp); 216 217 /* Remember that we're now on the signal stack. */ 218 if (onstack) 219 p->p_sigctx.ps_sigstk.ss_flags |= SS_ONSTACK; 220 } 221 222 void setup_linux_sigframe(tf, sig, mask) 223 struct trapframe *tf; 224 int sig; 225 sigset_t *mask; 226 { 227 struct lwp *l = curproc; 228 struct proc *p = l->l_proc; 229 struct linux_sigframe *sfp, sigframe; 230 int onstack; 231 int fsize, rndfsize; 232 extern char linux_sigcode[], linux_esigcode[]; 233 234 /* Do we need to jump onto the signal stack? */ 235 onstack = (p->p_sigctx.ps_sigstk.ss_flags & (SS_DISABLE | SS_ONSTACK)) == 0 && 236 (SIGACTION(p, sig).sa_flags & SA_ONSTACK) != 0; 237 238 /* Allocate space for the signal handler context. */ 239 fsize = sizeof(struct linux_sigframe); 240 rndfsize = ((fsize + 15) / 16) * 16; 241 242 if (onstack) 243 sfp = (struct linux_sigframe *) 244 ((caddr_t)p->p_sigctx.ps_sigstk.ss_sp + 245 p->p_sigctx.ps_sigstk.ss_size); 246 else 247 sfp = (struct linux_sigframe *)(alpha_pal_rdusp()); 248 sfp = (struct linux_sigframe *)((caddr_t)sfp - rndfsize); 249 250 #ifdef DEBUG 251 if ((sigdebug & SDB_KSTACK) && (p->p_pid == sigpid)) 252 printf("linux_sendsig(%d): sig %d ssp %p usp %p\n", p->p_pid, 253 sig, &onstack, sfp); 254 #endif /* DEBUG */ 255 256 /* 257 * Build the signal context to be used by sigreturn. 258 */ 259 bzero(&sigframe.sf_sc, sizeof(struct linux_ucontext)); 260 sigframe.sf_sc.sc_onstack = onstack; 261 native_to_linux_old_sigset(mask, &sigframe.sf_sc.sc_mask); 262 sigframe.sf_sc.sc_pc = tf->tf_regs[FRAME_PC]; 263 sigframe.sf_sc.sc_ps = ALPHA_PSL_USERMODE; 264 frametoreg(tf, (struct reg *)sigframe.sf_sc.sc_regs); 265 sigframe.sf_sc.sc_regs[R_SP] = alpha_pal_rdusp(); 266 267 if (l == fpcurproc) { 268 alpha_pal_wrfen(1); 269 savefpstate(&l->l_addr->u_pcb.pcb_fp); 270 alpha_pal_wrfen(0); 271 sigframe.sf_sc.sc_fpcr = l->l_addr->u_pcb.pcb_fp.fpr_cr; 272 fpcurproc = NULL; 273 } 274 /* XXX ownedfp ? etc...? */ 275 276 sigframe.sf_sc.sc_traparg_a0 = tf->tf_regs[FRAME_A0]; 277 sigframe.sf_sc.sc_traparg_a1 = tf->tf_regs[FRAME_A1]; 278 sigframe.sf_sc.sc_traparg_a2 = tf->tf_regs[FRAME_A2]; 279 280 if (copyout((caddr_t)&sigframe, (caddr_t)sfp, fsize) != 0) { 281 #ifdef DEBUG 282 if ((sigdebug & SDB_KSTACK) && p->p_pid == sigpid) 283 printf("sendsig(%d): copyout failed on sig %d\n", 284 p->p_pid, sig); 285 #endif 286 /* 287 * Process has trashed its stack; give it an illegal 288 * instruction to halt it in its tracks. 289 */ 290 sigexit(l, SIGILL); 291 /* NOTREACHED */ 292 } 293 294 /* Pass pointers to sigcontext in the regs */ 295 tf->tf_regs[FRAME_A1] = 0; 296 tf->tf_regs[FRAME_A2] = (unsigned long)&sfp->sf_sc; 297 298 /* Address of trampoline code. End up at this PC after mi_switch */ 299 tf->tf_regs[FRAME_PC] = 300 (u_int64_t)(PS_STRINGS - (linux_esigcode - linux_sigcode)); 301 302 /* Adjust the stack */ 303 alpha_pal_wrusp((unsigned long)sfp); 304 305 /* Remember that we're now on the signal stack. */ 306 if (onstack) 307 p->p_sigctx.ps_sigstk.ss_flags |= SS_ONSTACK; 308 } 309 310 /* 311 * Send an interrupt to process. 312 * 313 * Stack is set up to allow sigcode stored 314 * in u. to call routine, followed by kcall 315 * to sigreturn routine below. After sigreturn 316 * resets the signal mask, the stack, and the 317 * frame pointer, it returns to the user 318 * specified pc, psl. 319 */ 320 void 321 linux_sendsig(catcher, sig, mask, code) 322 sig_t catcher; 323 int sig; 324 sigset_t *mask; 325 u_long code; 326 { 327 struct lwp *l = curproc; 328 struct trapframe *tf = l->l_md.md_tf; 329 #ifdef notyet 330 struct linux_emuldata *edp; 331 332 /* Setup the signal frame (and part of the trapframe) */ 333 /*OLD: if (p->p_sigacts->ps_siginfo & sigmask(sig))*/ 334 /* XXX XAX this is broken now. need someplace to store what 335 XXX XAX kind of signal handler a signal has.*/ 336 #if 0 337 edp = (struct linux_emuldata *)p->p_emuldata; 338 #else 339 edp = 0; 340 #endif 341 if (edp && sigismember(&edp->ps_siginfo, sig)) 342 setup_linux_rt_sigframe(tf, sig, mask); 343 else 344 #endif /* notyet */ 345 setup_linux_sigframe(tf, sig, mask); 346 347 /* Signal handler for trampoline code */ 348 tf->tf_regs[FRAME_T12] = (u_int64_t)catcher; 349 tf->tf_regs[FRAME_A0] = native_to_linux_sig[sig]; 350 351 /* 352 * Linux has a custom restorer option. To support it we would 353 * need to store an array of restorers and a sigcode block 354 * which knew to use it. Doesn't seem worth the trouble. 355 * -erh 356 */ 357 358 #ifdef DEBUG 359 if (sigdebug & SDB_FOLLOW) 360 printf("sendsig(%d): pc %lx, catcher %lx\n", l->l_proc->p_pid, 361 tf->tf_regs[FRAME_PC], tf->tf_regs[FRAME_A3]); 362 if ((sigdebug & SDB_KSTACK) && l->l_proc->p_pid == sigpid) 363 printf("sendsig(%d): sig %d returns\n", l->l_proc->p_pid, sig); 364 #endif 365 } 366 367 /* 368 * System call to cleanup state after a signal 369 * has been taken. Reset signal mask and 370 * stack state from context left by sendsig (above). 371 * Return to previous pc as specified by context 372 * left by sendsig. 373 * Linux real-time signals use a different sigframe, 374 * but the sigcontext is the same. 375 */ 376 377 int 378 linux_restore_sigcontext(struct lwp *l, struct linux_sigcontext context, 379 sigset_t *mask) 380 { 381 382 struct proc *p = l->l_proc; 383 /* 384 * Linux doesn't (yet) have alternate signal stacks. 385 * However, the OSF/1 sigcontext which they use has 386 * an onstack member. This could be needed in the future. 387 */ 388 if (context.sc_onstack & LINUX_SA_ONSTACK) 389 p->p_sigctx.ps_sigstk.ss_flags |= SS_ONSTACK; 390 else 391 p->p_sigctx.ps_sigstk.ss_flags &= ~SS_ONSTACK; 392 393 /* Reset the signal mask */ 394 (void) sigprocmask1(p, SIG_SETMASK, mask, 0); 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 == fpcurproc) 410 fpcurproc = NULL; 411 412 /* Restore fp regs and fpr_cr */ 413 bcopy((struct fpreg *)context.sc_fpregs, &l->l_addr->u_pcb.pcb_fp, 414 sizeof(struct fpreg)); 415 /* XXX sc_ownedfp ? */ 416 /* XXX sc_fp_control ? */ 417 418 #ifdef DEBUG 419 if (sigdebug & SDB_FOLLOW) 420 printf("linux_rt_sigreturn(%d): returns\n", p->p_pid); 421 #endif 422 return (EJUSTRETURN); 423 } 424 425 int 426 linux_sys_rt_sigreturn(l, v, retval) 427 struct lwp *l; 428 void *v; 429 register_t *retval; 430 { 431 struct linux_sys_rt_sigreturn_args /* { 432 syscallarg(struct linux_rt_sigframe *) sfp; 433 } */ *uap = v; 434 struct linux_rt_sigframe *sfp, sigframe; 435 sigset_t mask; 436 437 /* 438 * The trampoline code hands us the context. 439 * It is unsafe to keep track of it ourselves, in the event that a 440 * program jumps out of a signal handler. 441 */ 442 443 sfp = SCARG(uap, sfp); 444 445 if (ALIGN(sfp) != (u_int64_t)sfp) 446 return(EINVAL); 447 448 /* 449 * Fetch the frame structure. 450 */ 451 if (copyin((caddr_t)sfp, &sigframe, 452 sizeof(struct linux_rt_sigframe)) != 0) 453 return (EFAULT); 454 455 /* Grab the signal mask */ 456 linux_to_native_sigset(&sigframe.uc.uc_sigmask, &mask); 457 458 return(linux_restore_sigcontext(l, sigframe.uc.uc_mcontext, &mask)); 459 } 460 461 462 int 463 linux_sys_sigreturn(l, v, retval) 464 struct lwp *l; 465 void *v; 466 register_t *retval; 467 { 468 struct linux_sys_sigreturn_args /* { 469 syscallarg(struct linux_sigframe *) sfp; 470 } */ *uap = v; 471 struct linux_sigframe *sfp, frame; 472 sigset_t mask; 473 474 /* 475 * The trampoline code hands us the context. 476 * It is unsafe to keep track of it ourselves, in the event that a 477 * program jumps out of a signal handler. 478 */ 479 480 sfp = SCARG(uap, sfp); 481 if (ALIGN(sfp) != (u_int64_t)sfp) 482 return(EINVAL); 483 484 /* 485 * Fetch the frame structure. 486 */ 487 if (copyin((caddr_t)sfp, &frame, sizeof(struct linux_sigframe)) != 0) 488 return(EFAULT); 489 490 /* Grab the signal mask. */ 491 /* XXX use frame.extramask */ 492 linux_old_to_native_sigset(frame.sf_sc.sc_mask, &mask); 493 494 return(linux_restore_sigcontext(l, frame.sf_sc, &mask)); 495 } 496 497 /* 498 * We come here in a last attempt to satisfy a Linux ioctl() call 499 */ 500 /* XXX XAX update this, add maps, etc... */ 501 int 502 linux_machdepioctl(p, v, retval) 503 struct proc *p; 504 void *v; 505 register_t *retval; 506 { 507 struct linux_sys_ioctl_args /* { 508 syscallarg(int) fd; 509 syscallarg(u_long) com; 510 syscallarg(caddr_t) data; 511 } */ *uap = v; 512 struct sys_ioctl_args bia; 513 u_long com; 514 515 SCARG(&bia, fd) = SCARG(uap, fd); 516 SCARG(&bia, data) = SCARG(uap, data); 517 com = SCARG(uap, com); 518 519 switch (com) { 520 default: 521 printf("linux_machdepioctl: invalid ioctl %08lx\n", com); 522 return EINVAL; 523 } 524 SCARG(&bia, com) = com; 525 /* XXX njwlwp */ 526 return sys_ioctl(curproc, &bia, retval); 527 } 528 529 /* XXX XAX fix this */ 530 dev_t 531 linux_fakedev(dev) 532 dev_t dev; 533 { 534 return dev; 535 } 536 537
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