linux_machdep.c revision 1.15
1 /* $NetBSD: linux_machdep.c,v 1.15 2001/01/26 19:45:58 manu 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 #include <sys/ioctl.h> 67 68 #include <uvm/uvm_extern.h> 69 70 #include <compat/linux/common/linux_types.h> 71 #include <compat/linux/common/linux_signal.h> 72 #include <compat/linux/common/linux_siginfo.h> 73 #include <compat/linux/common/linux_util.h> 74 #include <compat/linux/common/linux_ioctl.h> 75 #include <compat/linux/common/linux_exec.h> 76 #include <compat/linux/common/linux_machdep.h> 77 #include <compat/linux/common/linux_emuldata.h> 78 79 #include <compat/linux/linux_syscallargs.h> 80 81 #include <machine/alpha.h> 82 #include <machine/reg.h> 83 84 #if defined(_KERNEL) && !defined(_LKM) 85 #include "wsdisplay.h" 86 #endif 87 #if (NWSDISPLAY >0) 88 #include <dev/wscons/wsdisplay_usl_io.h> 89 #endif 90 #ifdef DEBUG 91 #include <machine/sigdebug.h> 92 #endif 93 94 /* 95 * Deal with some alpha-specific things in the Linux emulation code. 96 */ 97 98 void 99 linux_setregs(p, epp, stack) 100 struct proc *p; 101 struct exec_package *epp; 102 u_long stack; 103 { 104 /* XXX XAX I think this is ok. not sure though. */ 105 setregs(p, epp, stack); 106 } 107 108 void setup_linux_rt_sigframe(tf, sig, mask) 109 struct trapframe *tf; 110 int sig; 111 sigset_t *mask; 112 { 113 struct proc *p = curproc; 114 struct linux_rt_sigframe *sfp, sigframe; 115 int onstack; 116 int fsize, rndfsize; 117 extern char linux_rt_sigcode[], linux_rt_esigcode[]; 118 119 /* Do we need to jump onto the signal stack? */ 120 onstack = (p->p_sigctx.ps_sigstk.ss_flags & (SS_DISABLE | SS_ONSTACK)) == 0 && 121 (SIGACTION(p, sig).sa_flags & SA_ONSTACK) != 0; 122 123 /* Allocate space for the signal handler context. */ 124 fsize = sizeof(struct linux_rt_sigframe); 125 rndfsize = ((fsize + 15) / 16) * 16; 126 127 if (onstack) 128 sfp = (struct linux_rt_sigframe *) 129 ((caddr_t)p->p_sigctx.ps_sigstk.ss_sp + 130 p->p_sigctx.ps_sigstk.ss_size); 131 else 132 sfp = (struct linux_rt_sigframe *)(alpha_pal_rdusp()); 133 sfp = (struct linux_rt_sigframe *)((caddr_t)sfp - rndfsize); 134 135 #ifdef DEBUG 136 if ((sigdebug & SDB_KSTACK) && (p->p_pid == sigpid)) 137 printf("linux_sendsig(%d): sig %d ssp %p usp %p\n", p->p_pid, 138 sig, &onstack, sfp); 139 #endif /* DEBUG */ 140 141 /* 142 * Build the signal context to be used by sigreturn. 143 */ 144 bzero(&sigframe.uc, sizeof(struct linux_ucontext)); 145 sigframe.uc.uc_mcontext.sc_onstack = onstack; 146 147 /* Setup potentially partial signal mask in sc_mask. */ 148 /* But get all of it in uc_sigmask */ 149 native_to_linux_old_sigset(mask, &sigframe.uc.uc_mcontext.sc_mask); 150 native_to_linux_sigset(mask, &sigframe.uc.uc_sigmask); 151 152 sigframe.uc.uc_mcontext.sc_pc = tf->tf_regs[FRAME_PC]; 153 sigframe.uc.uc_mcontext.sc_ps = ALPHA_PSL_USERMODE; 154 frametoreg(tf, (struct reg *)sigframe.uc.uc_mcontext.sc_regs); 155 sigframe.uc.uc_mcontext.sc_regs[R_SP] = alpha_pal_rdusp(); 156 157 if (p == fpcurproc) { 158 alpha_pal_wrfen(1); 159 savefpstate(&p->p_addr->u_pcb.pcb_fp); 160 alpha_pal_wrfen(0); 161 sigframe.uc.uc_mcontext.sc_fpcr = p->p_addr->u_pcb.pcb_fp.fpr_cr; 162 fpcurproc = NULL; 163 } 164 /* XXX ownedfp ? etc...? */ 165 166 sigframe.uc.uc_mcontext.sc_traparg_a0 = tf->tf_regs[FRAME_A0]; 167 sigframe.uc.uc_mcontext.sc_traparg_a1 = tf->tf_regs[FRAME_A1]; 168 sigframe.uc.uc_mcontext.sc_traparg_a2 = tf->tf_regs[FRAME_A2]; 169 170 /* 171 * XXX XAX Create bogus siginfo data. This can't really 172 * XXX be fixed until NetBSD has realtime signals. 173 * XXX Or we do the emuldata thing. 174 * XXX -erh 175 */ 176 bzero(&sigframe.info, sizeof(struct linux_siginfo)); 177 sigframe.info.lsi_signo = sig; 178 sigframe.info.lsi_code = LINUX_SI_USER; 179 sigframe.info.lsi_pid = p->p_pid; 180 sigframe.info.lsi_uid = p->p_ucred->cr_uid; /* Use real uid here? */ 181 182 if (copyout((caddr_t)&sigframe, (caddr_t)sfp, fsize) != 0) { 183 #ifdef DEBUG 184 if ((sigdebug & SDB_KSTACK) && p->p_pid == sigpid) 185 printf("sendsig(%d): copyout failed on sig %d\n", 186 p->p_pid, sig); 187 #endif 188 /* 189 * Process has trashed its stack; give it an illegal 190 * instruction to halt it in its tracks. 191 */ 192 sigexit(p, SIGILL); 193 /* NOTREACHED */ 194 } 195 196 /* Pass pointers to siginfo and ucontext in the regs */ 197 tf->tf_regs[FRAME_A1] = (unsigned long)&sfp->info; 198 tf->tf_regs[FRAME_A2] = (unsigned long)&sfp->uc; 199 200 /* Address of trampoline code. End up at this PC after mi_switch */ 201 tf->tf_regs[FRAME_PC] = 202 (u_int64_t)(PS_STRINGS - (linux_rt_esigcode - linux_rt_sigcode)); 203 204 /* Adjust the stack */ 205 alpha_pal_wrusp((unsigned long)sfp); 206 207 /* Remember that we're now on the signal stack. */ 208 if (onstack) 209 p->p_sigctx.ps_sigstk.ss_flags |= SS_ONSTACK; 210 } 211 212 void setup_linux_sigframe(tf, sig, mask) 213 struct trapframe *tf; 214 int sig; 215 sigset_t *mask; 216 { 217 struct proc *p = curproc; 218 struct linux_sigframe *sfp, sigframe; 219 int onstack; 220 int fsize, rndfsize; 221 extern char linux_sigcode[], linux_esigcode[]; 222 223 /* Do we need to jump onto the signal stack? */ 224 onstack = (p->p_sigctx.ps_sigstk.ss_flags & (SS_DISABLE | SS_ONSTACK)) == 0 && 225 (SIGACTION(p, sig).sa_flags & SA_ONSTACK) != 0; 226 227 /* Allocate space for the signal handler context. */ 228 fsize = sizeof(struct linux_sigframe); 229 rndfsize = ((fsize + 15) / 16) * 16; 230 231 if (onstack) 232 sfp = (struct linux_sigframe *) 233 ((caddr_t)p->p_sigctx.ps_sigstk.ss_sp + 234 p->p_sigctx.ps_sigstk.ss_size); 235 else 236 sfp = (struct linux_sigframe *)(alpha_pal_rdusp()); 237 sfp = (struct linux_sigframe *)((caddr_t)sfp - rndfsize); 238 239 #ifdef DEBUG 240 if ((sigdebug & SDB_KSTACK) && (p->p_pid == sigpid)) 241 printf("linux_sendsig(%d): sig %d ssp %p usp %p\n", p->p_pid, 242 sig, &onstack, sfp); 243 #endif /* DEBUG */ 244 245 /* 246 * Build the signal context to be used by sigreturn. 247 */ 248 bzero(&sigframe.sf_sc, sizeof(struct linux_ucontext)); 249 sigframe.sf_sc.sc_onstack = onstack; 250 native_to_linux_old_sigset(mask, &sigframe.sf_sc.sc_mask); 251 sigframe.sf_sc.sc_pc = tf->tf_regs[FRAME_PC]; 252 sigframe.sf_sc.sc_ps = ALPHA_PSL_USERMODE; 253 frametoreg(tf, (struct reg *)sigframe.sf_sc.sc_regs); 254 sigframe.sf_sc.sc_regs[R_SP] = alpha_pal_rdusp(); 255 256 if (p == fpcurproc) { 257 alpha_pal_wrfen(1); 258 savefpstate(&p->p_addr->u_pcb.pcb_fp); 259 alpha_pal_wrfen(0); 260 sigframe.sf_sc.sc_fpcr = p->p_addr->u_pcb.pcb_fp.fpr_cr; 261 fpcurproc = NULL; 262 } 263 /* XXX ownedfp ? etc...? */ 264 265 sigframe.sf_sc.sc_traparg_a0 = tf->tf_regs[FRAME_A0]; 266 sigframe.sf_sc.sc_traparg_a1 = tf->tf_regs[FRAME_A1]; 267 sigframe.sf_sc.sc_traparg_a2 = tf->tf_regs[FRAME_A2]; 268 269 if (copyout((caddr_t)&sigframe, (caddr_t)sfp, fsize) != 0) { 270 #ifdef DEBUG 271 if ((sigdebug & SDB_KSTACK) && p->p_pid == sigpid) 272 printf("sendsig(%d): copyout failed on sig %d\n", 273 p->p_pid, sig); 274 #endif 275 /* 276 * Process has trashed its stack; give it an illegal 277 * instruction to halt it in its tracks. 278 */ 279 sigexit(p, SIGILL); 280 /* NOTREACHED */ 281 } 282 283 /* Pass pointers to sigcontext in the regs */ 284 tf->tf_regs[FRAME_A1] = 0; 285 tf->tf_regs[FRAME_A2] = (unsigned long)&sfp->sf_sc; 286 287 /* Address of trampoline code. End up at this PC after mi_switch */ 288 tf->tf_regs[FRAME_PC] = 289 (u_int64_t)(PS_STRINGS - (linux_esigcode - linux_sigcode)); 290 291 /* Adjust the stack */ 292 alpha_pal_wrusp((unsigned long)sfp); 293 294 /* Remember that we're now on the signal stack. */ 295 if (onstack) 296 p->p_sigctx.ps_sigstk.ss_flags |= SS_ONSTACK; 297 } 298 299 /* 300 * Send an interrupt to process. 301 * 302 * Stack is set up to allow sigcode stored 303 * in u. to call routine, followed by kcall 304 * to sigreturn routine below. After sigreturn 305 * resets the signal mask, the stack, and the 306 * frame pointer, it returns to the user 307 * specified pc, psl. 308 */ 309 void 310 linux_sendsig(catcher, sig, mask, code) 311 sig_t catcher; 312 int sig; 313 sigset_t *mask; 314 u_long code; 315 { 316 struct proc *p = curproc; 317 struct trapframe *tf = p->p_md.md_tf; 318 #ifdef notyet 319 struct linux_emuldata *edp; 320 321 /* Setup the signal frame (and part of the trapframe) */ 322 /*OLD: if (p->p_sigacts->ps_siginfo & sigmask(sig))*/ 323 /* XXX XAX this is broken now. need someplace to store what 324 XXX XAX kind of signal handler a signal has.*/ 325 #if 0 326 edp = (struct linux_emuldata *)p->p_emuldata; 327 #else 328 edp = 0; 329 #endif 330 if (edp && sigismember(&edp->ps_siginfo, sig)) 331 setup_linux_rt_sigframe(tf, sig, mask); 332 else 333 #endif /* notyet */ 334 setup_linux_sigframe(tf, sig, mask); 335 336 /* Signal handler for trampoline code */ 337 tf->tf_regs[FRAME_T12] = (u_int64_t)catcher; 338 tf->tf_regs[FRAME_A0] = native_to_linux_sig[sig]; 339 340 /* 341 * Linux has a custom restorer option. To support it we would 342 * need to store an array of restorers and a sigcode block 343 * which knew to use it. Doesn't seem worth the trouble. 344 * -erh 345 */ 346 347 #ifdef DEBUG 348 if (sigdebug & SDB_FOLLOW) 349 printf("sendsig(%d): pc %lx, catcher %lx\n", p->p_pid, 350 tf->tf_regs[FRAME_PC], tf->tf_regs[FRAME_A3]); 351 if ((sigdebug & SDB_KSTACK) && p->p_pid == sigpid) 352 printf("sendsig(%d): sig %d returns\n", p->p_pid, sig); 353 #endif 354 } 355 356 /* 357 * System call to cleanup state after a signal 358 * has been taken. Reset signal mask and 359 * stack state from context left by sendsig (above). 360 * Return to previous pc as specified by context 361 * left by sendsig. 362 * Linux real-time signals use a different sigframe, 363 * but the sigcontext is the same. 364 */ 365 366 int 367 linux_restore_sigcontext(struct proc *p, struct linux_sigcontext context, 368 sigset_t *mask) 369 { 370 371 /* 372 * Linux doesn't (yet) have alternate signal stacks. 373 * However, the OSF/1 sigcontext which they use has 374 * an onstack member. This could be needed in the future. 375 */ 376 if (context.sc_onstack & LINUX_SA_ONSTACK) 377 p->p_sigctx.ps_sigstk.ss_flags |= SS_ONSTACK; 378 else 379 p->p_sigctx.ps_sigstk.ss_flags &= ~SS_ONSTACK; 380 381 /* Reset the signal mask */ 382 (void) sigprocmask1(p, SIG_SETMASK, mask, 0); 383 384 /* 385 * Check for security violations. 386 * Linux doesn't allow any changes to the PSL. 387 */ 388 if (context.sc_ps != ALPHA_PSL_USERMODE) 389 return(EINVAL); 390 391 p->p_md.md_tf->tf_regs[FRAME_PC] = context.sc_pc; 392 p->p_md.md_tf->tf_regs[FRAME_PS] = context.sc_ps; 393 394 regtoframe((struct reg *)context.sc_regs, p->p_md.md_tf); 395 alpha_pal_wrusp(context.sc_regs[R_SP]); 396 397 if (p == fpcurproc) 398 fpcurproc = NULL; 399 400 /* Restore fp regs and fpr_cr */ 401 bcopy((struct fpreg *)context.sc_fpregs, &p->p_addr->u_pcb.pcb_fp, 402 sizeof(struct fpreg)); 403 /* XXX sc_ownedfp ? */ 404 /* XXX sc_fp_control ? */ 405 406 #ifdef DEBUG 407 if (sigdebug & SDB_FOLLOW) 408 printf("linux_rt_sigreturn(%d): returns\n", p->p_pid); 409 #endif 410 return (EJUSTRETURN); 411 } 412 413 int 414 linux_sys_rt_sigreturn(p, v, retval) 415 struct proc *p; 416 void *v; 417 register_t *retval; 418 { 419 struct linux_sys_rt_sigreturn_args /* { 420 syscallarg(struct linux_rt_sigframe *) sfp; 421 } */ *uap = v; 422 struct linux_rt_sigframe *sfp, sigframe; 423 sigset_t mask; 424 425 /* 426 * The trampoline code hands us the context. 427 * It is unsafe to keep track of it ourselves, in the event that a 428 * program jumps out of a signal handler. 429 */ 430 431 sfp = SCARG(uap, sfp); 432 433 if (ALIGN(sfp) != (u_int64_t)sfp) 434 return(EINVAL); 435 436 /* 437 * Fetch the frame structure. 438 */ 439 if (copyin((caddr_t)sfp, &sigframe, 440 sizeof(struct linux_rt_sigframe)) != 0) 441 return (EFAULT); 442 443 /* Grab the signal mask */ 444 linux_to_native_sigset(&sigframe.uc.uc_sigmask, &mask); 445 446 return(linux_restore_sigcontext(p, sigframe.uc.uc_mcontext, &mask)); 447 } 448 449 450 int 451 linux_sys_sigreturn(p, v, retval) 452 struct proc *p; 453 void *v; 454 register_t *retval; 455 { 456 struct linux_sys_sigreturn_args /* { 457 syscallarg(struct linux_sigframe *) sfp; 458 } */ *uap = v; 459 struct linux_sigframe *sfp, frame; 460 sigset_t mask; 461 462 /* 463 * The trampoline code hands us the context. 464 * It is unsafe to keep track of it ourselves, in the event that a 465 * program jumps out of a signal handler. 466 */ 467 468 sfp = SCARG(uap, sfp); 469 if (ALIGN(sfp) != (u_int64_t)sfp) 470 return(EINVAL); 471 472 /* 473 * Fetch the frame structure. 474 */ 475 if (copyin((caddr_t)sfp, &frame, sizeof(struct linux_sigframe)) != 0) 476 return(EFAULT); 477 478 /* Grab the signal mask. */ 479 /* XXX use frame.extramask */ 480 linux_old_to_native_sigset(frame.sf_sc.sc_mask, &mask); 481 482 return(linux_restore_sigcontext(p, frame.sf_sc, &mask)); 483 } 484 485 /* 486 * We come here in a last attempt to satisfy a Linux ioctl() call 487 */ 488 /* XXX XAX update this, add maps, etc... */ 489 int 490 linux_machdepioctl(p, v, retval) 491 struct proc *p; 492 void *v; 493 register_t *retval; 494 { 495 struct linux_sys_ioctl_args /* { 496 syscallarg(int) fd; 497 syscallarg(u_long) com; 498 syscallarg(caddr_t) data; 499 } */ *uap = v; 500 struct sys_ioctl_args bia; 501 u_long com; 502 503 SCARG(&bia, fd) = SCARG(uap, fd); 504 SCARG(&bia, data) = SCARG(uap, data); 505 com = SCARG(uap, com); 506 507 switch (com) { 508 default: 509 printf("linux_machdepioctl: invalid ioctl %08lx\n", com); 510 return EINVAL; 511 } 512 SCARG(&bia, com) = com; 513 return sys_ioctl(p, &bia, retval); 514 } 515 516 /* XXX XAX fix this */ 517 dev_t 518 linux_fakedev(dev) 519 dev_t dev; 520 { 521 return dev; 522 } 523 524
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