1 /* $NetBSD: linux_machdep.c,v 1.18 2001/09/30 02:36:42 simonb 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_OPT) 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 #ifdef DEBUG 105 struct trapframe *tfp = p->p_md.md_tf; 106 #endif 107 108 setregs(p, epp, stack); 109 #ifdef DEBUG 110 /* 111 * Linux has registers set to zero on entry; for DEBUG kernels 112 * the alpha setregs() fills registers with 0xbabefacedeadbeef. 113 */ 114 memset(tfp->tf_regs, 0, FRAME_SIZE * sizeof tfp->tf_regs[0]); 115 #endif 116 } 117 118 void setup_linux_rt_sigframe(tf, sig, mask) 119 struct trapframe *tf; 120 int sig; 121 sigset_t *mask; 122 { 123 struct proc *p = curproc; 124 struct linux_rt_sigframe *sfp, sigframe; 125 int onstack; 126 int fsize, rndfsize; 127 extern char linux_rt_sigcode[], linux_rt_esigcode[]; 128 129 /* Do we need to jump onto the signal stack? */ 130 onstack = (p->p_sigctx.ps_sigstk.ss_flags & (SS_DISABLE | SS_ONSTACK)) == 0 && 131 (SIGACTION(p, sig).sa_flags & SA_ONSTACK) != 0; 132 133 /* Allocate space for the signal handler context. */ 134 fsize = sizeof(struct linux_rt_sigframe); 135 rndfsize = ((fsize + 15) / 16) * 16; 136 137 if (onstack) 138 sfp = (struct linux_rt_sigframe *) 139 ((caddr_t)p->p_sigctx.ps_sigstk.ss_sp + 140 p->p_sigctx.ps_sigstk.ss_size); 141 else 142 sfp = (struct linux_rt_sigframe *)(alpha_pal_rdusp()); 143 sfp = (struct linux_rt_sigframe *)((caddr_t)sfp - rndfsize); 144 145 #ifdef DEBUG 146 if ((sigdebug & SDB_KSTACK) && (p->p_pid == sigpid)) 147 printf("linux_sendsig(%d): sig %d ssp %p usp %p\n", p->p_pid, 148 sig, &onstack, sfp); 149 #endif /* DEBUG */ 150 151 /* 152 * Build the signal context to be used by sigreturn. 153 */ 154 bzero(&sigframe.uc, sizeof(struct linux_ucontext)); 155 sigframe.uc.uc_mcontext.sc_onstack = onstack; 156 157 /* Setup potentially partial signal mask in sc_mask. */ 158 /* But get all of it in uc_sigmask */ 159 native_to_linux_old_sigset(mask, &sigframe.uc.uc_mcontext.sc_mask); 160 native_to_linux_sigset(mask, &sigframe.uc.uc_sigmask); 161 162 sigframe.uc.uc_mcontext.sc_pc = tf->tf_regs[FRAME_PC]; 163 sigframe.uc.uc_mcontext.sc_ps = ALPHA_PSL_USERMODE; 164 frametoreg(tf, (struct reg *)sigframe.uc.uc_mcontext.sc_regs); 165 sigframe.uc.uc_mcontext.sc_regs[R_SP] = alpha_pal_rdusp(); 166 167 alpha_enable_fp(p, 1); 168 sigframe.uc.uc_mcontext.sc_fpcr = alpha_read_fpcr(); 169 sigframe.uc.uc_mcontext.sc_fp_control = alpha_read_fp_c(p); 170 alpha_pal_wrfen(0); 171 172 sigframe.uc.uc_mcontext.sc_traparg_a0 = tf->tf_regs[FRAME_A0]; 173 sigframe.uc.uc_mcontext.sc_traparg_a1 = tf->tf_regs[FRAME_A1]; 174 sigframe.uc.uc_mcontext.sc_traparg_a2 = tf->tf_regs[FRAME_A2]; 175 176 /* 177 * XXX XAX Create bogus siginfo data. This can't really 178 * XXX be fixed until NetBSD has realtime signals. 179 * XXX Or we do the emuldata thing. 180 * XXX -erh 181 */ 182 bzero(&sigframe.info, sizeof(struct linux_siginfo)); 183 sigframe.info.lsi_signo = sig; 184 sigframe.info.lsi_code = LINUX_SI_USER; 185 sigframe.info.lsi_pid = p->p_pid; 186 sigframe.info.lsi_uid = p->p_ucred->cr_uid; /* Use real uid here? */ 187 188 if (copyout((caddr_t)&sigframe, (caddr_t)sfp, fsize) != 0) { 189 #ifdef DEBUG 190 if ((sigdebug & SDB_KSTACK) && p->p_pid == sigpid) 191 printf("sendsig(%d): copyout failed on sig %d\n", 192 p->p_pid, sig); 193 #endif 194 /* 195 * Process has trashed its stack; give it an illegal 196 * instruction to halt it in its tracks. 197 */ 198 sigexit(p, SIGILL); 199 /* NOTREACHED */ 200 } 201 202 /* Pass pointers to siginfo and ucontext in the regs */ 203 tf->tf_regs[FRAME_A1] = (unsigned long)&sfp->info; 204 tf->tf_regs[FRAME_A2] = (unsigned long)&sfp->uc; 205 206 /* Address of trampoline code. End up at this PC after mi_switch */ 207 tf->tf_regs[FRAME_PC] = 208 (u_int64_t)(PS_STRINGS - (linux_rt_esigcode - linux_rt_sigcode)); 209 210 /* Adjust the stack */ 211 alpha_pal_wrusp((unsigned long)sfp); 212 213 /* Remember that we're now on the signal stack. */ 214 if (onstack) 215 p->p_sigctx.ps_sigstk.ss_flags |= SS_ONSTACK; 216 } 217 218 void setup_linux_sigframe(tf, sig, mask) 219 struct trapframe *tf; 220 int sig; 221 sigset_t *mask; 222 { 223 struct proc *p = curproc; 224 struct linux_sigframe *sfp, sigframe; 225 int onstack; 226 int fsize, rndfsize; 227 extern char linux_sigcode[], linux_esigcode[]; 228 229 /* Do we need to jump onto the signal stack? */ 230 onstack = (p->p_sigctx.ps_sigstk.ss_flags & (SS_DISABLE | SS_ONSTACK)) == 0 && 231 (SIGACTION(p, sig).sa_flags & SA_ONSTACK) != 0; 232 233 /* Allocate space for the signal handler context. */ 234 fsize = sizeof(struct linux_sigframe); 235 rndfsize = ((fsize + 15) / 16) * 16; 236 237 if (onstack) 238 sfp = (struct linux_sigframe *) 239 ((caddr_t)p->p_sigctx.ps_sigstk.ss_sp + 240 p->p_sigctx.ps_sigstk.ss_size); 241 else 242 sfp = (struct linux_sigframe *)(alpha_pal_rdusp()); 243 sfp = (struct linux_sigframe *)((caddr_t)sfp - rndfsize); 244 245 #ifdef DEBUG 246 if ((sigdebug & SDB_KSTACK) && (p->p_pid == sigpid)) 247 printf("linux_sendsig(%d): sig %d ssp %p usp %p\n", p->p_pid, 248 sig, &onstack, sfp); 249 #endif /* DEBUG */ 250 251 /* 252 * Build the signal context to be used by sigreturn. 253 */ 254 bzero(&sigframe.sf_sc, sizeof(struct linux_ucontext)); 255 sigframe.sf_sc.sc_onstack = onstack; 256 native_to_linux_old_sigset(mask, &sigframe.sf_sc.sc_mask); 257 sigframe.sf_sc.sc_pc = tf->tf_regs[FRAME_PC]; 258 sigframe.sf_sc.sc_ps = ALPHA_PSL_USERMODE; 259 frametoreg(tf, (struct reg *)sigframe.sf_sc.sc_regs); 260 sigframe.sf_sc.sc_regs[R_SP] = alpha_pal_rdusp(); 261 262 if (p == fpcurproc) { 263 alpha_pal_wrfen(1); 264 savefpstate(&p->p_addr->u_pcb.pcb_fp); 265 alpha_pal_wrfen(0); 266 sigframe.sf_sc.sc_fpcr = p->p_addr->u_pcb.pcb_fp.fpr_cr; 267 fpcurproc = NULL; 268 } 269 /* XXX ownedfp ? etc...? */ 270 271 sigframe.sf_sc.sc_traparg_a0 = tf->tf_regs[FRAME_A0]; 272 sigframe.sf_sc.sc_traparg_a1 = tf->tf_regs[FRAME_A1]; 273 sigframe.sf_sc.sc_traparg_a2 = tf->tf_regs[FRAME_A2]; 274 275 if (copyout((caddr_t)&sigframe, (caddr_t)sfp, fsize) != 0) { 276 #ifdef DEBUG 277 if ((sigdebug & SDB_KSTACK) && p->p_pid == sigpid) 278 printf("sendsig(%d): copyout failed on sig %d\n", 279 p->p_pid, sig); 280 #endif 281 /* 282 * Process has trashed its stack; give it an illegal 283 * instruction to halt it in its tracks. 284 */ 285 sigexit(p, SIGILL); 286 /* NOTREACHED */ 287 } 288 289 /* Pass pointers to sigcontext in the regs */ 290 tf->tf_regs[FRAME_A1] = 0; 291 tf->tf_regs[FRAME_A2] = (unsigned long)&sfp->sf_sc; 292 293 /* Address of trampoline code. End up at this PC after mi_switch */ 294 tf->tf_regs[FRAME_PC] = 295 (u_int64_t)(PS_STRINGS - (linux_esigcode - linux_sigcode)); 296 297 /* Adjust the stack */ 298 alpha_pal_wrusp((unsigned long)sfp); 299 300 /* Remember that we're now on the signal stack. */ 301 if (onstack) 302 p->p_sigctx.ps_sigstk.ss_flags |= SS_ONSTACK; 303 } 304 305 /* 306 * Send an interrupt to process. 307 * 308 * Stack is set up to allow sigcode stored 309 * in u. to call routine, followed by kcall 310 * to sigreturn routine below. After sigreturn 311 * resets the signal mask, the stack, and the 312 * frame pointer, it returns to the user 313 * specified pc, psl. 314 */ 315 void 316 linux_sendsig(catcher, sig, mask, code) 317 sig_t catcher; 318 int sig; 319 sigset_t *mask; 320 u_long code; 321 { 322 struct proc *p = curproc; 323 struct trapframe *tf = p->p_md.md_tf; 324 #ifdef notyet 325 struct linux_emuldata *edp; 326 327 /* Setup the signal frame (and part of the trapframe) */ 328 /*OLD: if (p->p_sigacts->ps_siginfo & sigmask(sig))*/ 329 /* XXX XAX this is broken now. need someplace to store what 330 XXX XAX kind of signal handler a signal has.*/ 331 #if 0 332 edp = (struct linux_emuldata *)p->p_emuldata; 333 #else 334 edp = 0; 335 #endif 336 if (edp && sigismember(&edp->ps_siginfo, sig)) 337 setup_linux_rt_sigframe(tf, sig, mask); 338 else 339 #endif /* notyet */ 340 setup_linux_sigframe(tf, sig, mask); 341 342 /* Signal handler for trampoline code */ 343 tf->tf_regs[FRAME_T12] = (u_int64_t)catcher; 344 tf->tf_regs[FRAME_A0] = native_to_linux_sig[sig]; 345 346 /* 347 * Linux has a custom restorer option. To support it we would 348 * need to store an array of restorers and a sigcode block 349 * which knew to use it. Doesn't seem worth the trouble. 350 * -erh 351 */ 352 353 #ifdef DEBUG 354 if (sigdebug & SDB_FOLLOW) 355 printf("sendsig(%d): pc %lx, catcher %lx\n", p->p_pid, 356 tf->tf_regs[FRAME_PC], tf->tf_regs[FRAME_A3]); 357 if ((sigdebug & SDB_KSTACK) && p->p_pid == sigpid) 358 printf("sendsig(%d): sig %d returns\n", p->p_pid, sig); 359 #endif 360 } 361 362 /* 363 * System call to cleanup state after a signal 364 * has been taken. Reset signal mask and 365 * stack state from context left by sendsig (above). 366 * Return to previous pc as specified by context 367 * left by sendsig. 368 * Linux real-time signals use a different sigframe, 369 * but the sigcontext is the same. 370 */ 371 372 int 373 linux_restore_sigcontext(struct proc *p, struct linux_sigcontext context, 374 sigset_t *mask) 375 { 376 377 /* 378 * Linux doesn't (yet) have alternate signal stacks. 379 * However, the OSF/1 sigcontext which they use has 380 * an onstack member. This could be needed in the future. 381 */ 382 if (context.sc_onstack & LINUX_SA_ONSTACK) 383 p->p_sigctx.ps_sigstk.ss_flags |= SS_ONSTACK; 384 else 385 p->p_sigctx.ps_sigstk.ss_flags &= ~SS_ONSTACK; 386 387 /* Reset the signal mask */ 388 (void) sigprocmask1(p, SIG_SETMASK, mask, 0); 389 390 /* 391 * Check for security violations. 392 * Linux doesn't allow any changes to the PSL. 393 */ 394 if (context.sc_ps != ALPHA_PSL_USERMODE) 395 return(EINVAL); 396 397 p->p_md.md_tf->tf_regs[FRAME_PC] = context.sc_pc; 398 p->p_md.md_tf->tf_regs[FRAME_PS] = context.sc_ps; 399 400 regtoframe((struct reg *)context.sc_regs, p->p_md.md_tf); 401 alpha_pal_wrusp(context.sc_regs[R_SP]); 402 403 if (p == fpcurproc) 404 fpcurproc = NULL; 405 406 /* Restore fp regs and fpr_cr */ 407 bcopy((struct fpreg *)context.sc_fpregs, &p->p_addr->u_pcb.pcb_fp, 408 sizeof(struct fpreg)); 409 /* XXX sc_ownedfp ? */ 410 /* XXX sc_fp_control ? */ 411 412 #ifdef DEBUG 413 if (sigdebug & SDB_FOLLOW) 414 printf("linux_rt_sigreturn(%d): returns\n", p->p_pid); 415 #endif 416 return (EJUSTRETURN); 417 } 418 419 int 420 linux_sys_rt_sigreturn(p, v, retval) 421 struct proc *p; 422 void *v; 423 register_t *retval; 424 { 425 struct linux_sys_rt_sigreturn_args /* { 426 syscallarg(struct linux_rt_sigframe *) sfp; 427 } */ *uap = v; 428 struct linux_rt_sigframe *sfp, sigframe; 429 sigset_t mask; 430 431 /* 432 * The trampoline code hands us the context. 433 * It is unsafe to keep track of it ourselves, in the event that a 434 * program jumps out of a signal handler. 435 */ 436 437 sfp = SCARG(uap, sfp); 438 439 if (ALIGN(sfp) != (u_int64_t)sfp) 440 return(EINVAL); 441 442 /* 443 * Fetch the frame structure. 444 */ 445 if (copyin((caddr_t)sfp, &sigframe, 446 sizeof(struct linux_rt_sigframe)) != 0) 447 return (EFAULT); 448 449 /* Grab the signal mask */ 450 linux_to_native_sigset(&sigframe.uc.uc_sigmask, &mask); 451 452 return(linux_restore_sigcontext(p, sigframe.uc.uc_mcontext, &mask)); 453 } 454 455 456 int 457 linux_sys_sigreturn(p, v, retval) 458 struct proc *p; 459 void *v; 460 register_t *retval; 461 { 462 struct linux_sys_sigreturn_args /* { 463 syscallarg(struct linux_sigframe *) sfp; 464 } */ *uap = v; 465 struct linux_sigframe *sfp, frame; 466 sigset_t mask; 467 468 /* 469 * The trampoline code hands us the context. 470 * It is unsafe to keep track of it ourselves, in the event that a 471 * program jumps out of a signal handler. 472 */ 473 474 sfp = SCARG(uap, sfp); 475 if (ALIGN(sfp) != (u_int64_t)sfp) 476 return(EINVAL); 477 478 /* 479 * Fetch the frame structure. 480 */ 481 if (copyin((caddr_t)sfp, &frame, sizeof(struct linux_sigframe)) != 0) 482 return(EFAULT); 483 484 /* Grab the signal mask. */ 485 /* XXX use frame.extramask */ 486 linux_old_to_native_sigset(frame.sf_sc.sc_mask, &mask); 487 488 return(linux_restore_sigcontext(p, frame.sf_sc, &mask)); 489 } 490 491 /* 492 * We come here in a last attempt to satisfy a Linux ioctl() call 493 */ 494 /* XXX XAX update this, add maps, etc... */ 495 int 496 linux_machdepioctl(p, v, retval) 497 struct proc *p; 498 void *v; 499 register_t *retval; 500 { 501 struct linux_sys_ioctl_args /* { 502 syscallarg(int) fd; 503 syscallarg(u_long) com; 504 syscallarg(caddr_t) data; 505 } */ *uap = v; 506 struct sys_ioctl_args bia; 507 u_long com; 508 509 SCARG(&bia, fd) = SCARG(uap, fd); 510 SCARG(&bia, data) = SCARG(uap, data); 511 com = SCARG(uap, com); 512 513 switch (com) { 514 default: 515 printf("linux_machdepioctl: invalid ioctl %08lx\n", com); 516 return EINVAL; 517 } 518 SCARG(&bia, com) = com; 519 return sys_ioctl(p, &bia, retval); 520 } 521 522 /* XXX XAX fix this */ 523 dev_t 524 linux_fakedev(dev) 525 dev_t dev; 526 { 527 return dev; 528 } 529 530