linux_machdep.c revision 1.15.2.1
1 /* $NetBSD: linux_machdep.c,v 1.15.2.1 2001/06/21 19:59:25 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/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 /* 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 alpha_enable_fp(p, 1); 158 sigframe.uc.uc_mcontext.sc_fpcr = alpha_read_fpcr(); 159 sigframe.uc.uc_mcontext.sc_fp_control = alpha_read_fp_c(p); 160 alpha_pal_wrfen(0); 161 162 sigframe.uc.uc_mcontext.sc_traparg_a0 = tf->tf_regs[FRAME_A0]; 163 sigframe.uc.uc_mcontext.sc_traparg_a1 = tf->tf_regs[FRAME_A1]; 164 sigframe.uc.uc_mcontext.sc_traparg_a2 = tf->tf_regs[FRAME_A2]; 165 166 /* 167 * XXX XAX Create bogus siginfo data. This can't really 168 * XXX be fixed until NetBSD has realtime signals. 169 * XXX Or we do the emuldata thing. 170 * XXX -erh 171 */ 172 bzero(&sigframe.info, sizeof(struct linux_siginfo)); 173 sigframe.info.lsi_signo = sig; 174 sigframe.info.lsi_code = LINUX_SI_USER; 175 sigframe.info.lsi_pid = p->p_pid; 176 sigframe.info.lsi_uid = p->p_ucred->cr_uid; /* Use real uid here? */ 177 178 if (copyout((caddr_t)&sigframe, (caddr_t)sfp, fsize) != 0) { 179 #ifdef DEBUG 180 if ((sigdebug & SDB_KSTACK) && p->p_pid == sigpid) 181 printf("sendsig(%d): copyout failed on sig %d\n", 182 p->p_pid, sig); 183 #endif 184 /* 185 * Process has trashed its stack; give it an illegal 186 * instruction to halt it in its tracks. 187 */ 188 sigexit(p, SIGILL); 189 /* NOTREACHED */ 190 } 191 192 /* Pass pointers to siginfo and ucontext in the regs */ 193 tf->tf_regs[FRAME_A1] = (unsigned long)&sfp->info; 194 tf->tf_regs[FRAME_A2] = (unsigned long)&sfp->uc; 195 196 /* Address of trampoline code. End up at this PC after mi_switch */ 197 tf->tf_regs[FRAME_PC] = 198 (u_int64_t)(PS_STRINGS - (linux_rt_esigcode - linux_rt_sigcode)); 199 200 /* Adjust the stack */ 201 alpha_pal_wrusp((unsigned long)sfp); 202 203 /* Remember that we're now on the signal stack. */ 204 if (onstack) 205 p->p_sigctx.ps_sigstk.ss_flags |= SS_ONSTACK; 206 } 207 208 void setup_linux_sigframe(tf, sig, mask) 209 struct trapframe *tf; 210 int sig; 211 sigset_t *mask; 212 { 213 struct proc *p = curproc; 214 struct linux_sigframe *sfp, sigframe; 215 int onstack; 216 int fsize, rndfsize; 217 extern char linux_sigcode[], linux_esigcode[]; 218 219 /* Do we need to jump onto the signal stack? */ 220 onstack = (p->p_sigctx.ps_sigstk.ss_flags & (SS_DISABLE | SS_ONSTACK)) == 0 && 221 (SIGACTION(p, sig).sa_flags & SA_ONSTACK) != 0; 222 223 /* Allocate space for the signal handler context. */ 224 fsize = sizeof(struct linux_sigframe); 225 rndfsize = ((fsize + 15) / 16) * 16; 226 227 if (onstack) 228 sfp = (struct linux_sigframe *) 229 ((caddr_t)p->p_sigctx.ps_sigstk.ss_sp + 230 p->p_sigctx.ps_sigstk.ss_size); 231 else 232 sfp = (struct linux_sigframe *)(alpha_pal_rdusp()); 233 sfp = (struct linux_sigframe *)((caddr_t)sfp - rndfsize); 234 235 #ifdef DEBUG 236 if ((sigdebug & SDB_KSTACK) && (p->p_pid == sigpid)) 237 printf("linux_sendsig(%d): sig %d ssp %p usp %p\n", p->p_pid, 238 sig, &onstack, sfp); 239 #endif /* DEBUG */ 240 241 /* 242 * Build the signal context to be used by sigreturn. 243 */ 244 bzero(&sigframe.sf_sc, sizeof(struct linux_ucontext)); 245 sigframe.sf_sc.sc_onstack = onstack; 246 native_to_linux_old_sigset(mask, &sigframe.sf_sc.sc_mask); 247 sigframe.sf_sc.sc_pc = tf->tf_regs[FRAME_PC]; 248 sigframe.sf_sc.sc_ps = ALPHA_PSL_USERMODE; 249 frametoreg(tf, (struct reg *)sigframe.sf_sc.sc_regs); 250 sigframe.sf_sc.sc_regs[R_SP] = alpha_pal_rdusp(); 251 252 if (p == fpcurproc) { 253 alpha_pal_wrfen(1); 254 savefpstate(&p->p_addr->u_pcb.pcb_fp); 255 alpha_pal_wrfen(0); 256 sigframe.sf_sc.sc_fpcr = p->p_addr->u_pcb.pcb_fp.fpr_cr; 257 fpcurproc = NULL; 258 } 259 /* XXX ownedfp ? etc...? */ 260 261 sigframe.sf_sc.sc_traparg_a0 = tf->tf_regs[FRAME_A0]; 262 sigframe.sf_sc.sc_traparg_a1 = tf->tf_regs[FRAME_A1]; 263 sigframe.sf_sc.sc_traparg_a2 = tf->tf_regs[FRAME_A2]; 264 265 if (copyout((caddr_t)&sigframe, (caddr_t)sfp, fsize) != 0) { 266 #ifdef DEBUG 267 if ((sigdebug & SDB_KSTACK) && p->p_pid == sigpid) 268 printf("sendsig(%d): copyout failed on sig %d\n", 269 p->p_pid, sig); 270 #endif 271 /* 272 * Process has trashed its stack; give it an illegal 273 * instruction to halt it in its tracks. 274 */ 275 sigexit(p, SIGILL); 276 /* NOTREACHED */ 277 } 278 279 /* Pass pointers to sigcontext in the regs */ 280 tf->tf_regs[FRAME_A1] = 0; 281 tf->tf_regs[FRAME_A2] = (unsigned long)&sfp->sf_sc; 282 283 /* Address of trampoline code. End up at this PC after mi_switch */ 284 tf->tf_regs[FRAME_PC] = 285 (u_int64_t)(PS_STRINGS - (linux_esigcode - linux_sigcode)); 286 287 /* Adjust the stack */ 288 alpha_pal_wrusp((unsigned long)sfp); 289 290 /* Remember that we're now on the signal stack. */ 291 if (onstack) 292 p->p_sigctx.ps_sigstk.ss_flags |= SS_ONSTACK; 293 } 294 295 /* 296 * Send an interrupt to process. 297 * 298 * Stack is set up to allow sigcode stored 299 * in u. to call routine, followed by kcall 300 * to sigreturn routine below. After sigreturn 301 * resets the signal mask, the stack, and the 302 * frame pointer, it returns to the user 303 * specified pc, psl. 304 */ 305 void 306 linux_sendsig(catcher, sig, mask, code) 307 sig_t catcher; 308 int sig; 309 sigset_t *mask; 310 u_long code; 311 { 312 struct proc *p = curproc; 313 struct trapframe *tf = p->p_md.md_tf; 314 #ifdef notyet 315 struct linux_emuldata *edp; 316 317 /* Setup the signal frame (and part of the trapframe) */ 318 /*OLD: if (p->p_sigacts->ps_siginfo & sigmask(sig))*/ 319 /* XXX XAX this is broken now. need someplace to store what 320 XXX XAX kind of signal handler a signal has.*/ 321 #if 0 322 edp = (struct linux_emuldata *)p->p_emuldata; 323 #else 324 edp = 0; 325 #endif 326 if (edp && sigismember(&edp->ps_siginfo, sig)) 327 setup_linux_rt_sigframe(tf, sig, mask); 328 else 329 #endif /* notyet */ 330 setup_linux_sigframe(tf, sig, mask); 331 332 /* Signal handler for trampoline code */ 333 tf->tf_regs[FRAME_T12] = (u_int64_t)catcher; 334 tf->tf_regs[FRAME_A0] = native_to_linux_sig[sig]; 335 336 /* 337 * Linux has a custom restorer option. To support it we would 338 * need to store an array of restorers and a sigcode block 339 * which knew to use it. Doesn't seem worth the trouble. 340 * -erh 341 */ 342 343 #ifdef DEBUG 344 if (sigdebug & SDB_FOLLOW) 345 printf("sendsig(%d): pc %lx, catcher %lx\n", p->p_pid, 346 tf->tf_regs[FRAME_PC], tf->tf_regs[FRAME_A3]); 347 if ((sigdebug & SDB_KSTACK) && p->p_pid == sigpid) 348 printf("sendsig(%d): sig %d returns\n", p->p_pid, sig); 349 #endif 350 } 351 352 /* 353 * System call to cleanup state after a signal 354 * has been taken. Reset signal mask and 355 * stack state from context left by sendsig (above). 356 * Return to previous pc as specified by context 357 * left by sendsig. 358 * Linux real-time signals use a different sigframe, 359 * but the sigcontext is the same. 360 */ 361 362 int 363 linux_restore_sigcontext(struct proc *p, struct linux_sigcontext context, 364 sigset_t *mask) 365 { 366 367 /* 368 * Linux doesn't (yet) have alternate signal stacks. 369 * However, the OSF/1 sigcontext which they use has 370 * an onstack member. This could be needed in the future. 371 */ 372 if (context.sc_onstack & LINUX_SA_ONSTACK) 373 p->p_sigctx.ps_sigstk.ss_flags |= SS_ONSTACK; 374 else 375 p->p_sigctx.ps_sigstk.ss_flags &= ~SS_ONSTACK; 376 377 /* Reset the signal mask */ 378 (void) sigprocmask1(p, SIG_SETMASK, mask, 0); 379 380 /* 381 * Check for security violations. 382 * Linux doesn't allow any changes to the PSL. 383 */ 384 if (context.sc_ps != ALPHA_PSL_USERMODE) 385 return(EINVAL); 386 387 p->p_md.md_tf->tf_regs[FRAME_PC] = context.sc_pc; 388 p->p_md.md_tf->tf_regs[FRAME_PS] = context.sc_ps; 389 390 regtoframe((struct reg *)context.sc_regs, p->p_md.md_tf); 391 alpha_pal_wrusp(context.sc_regs[R_SP]); 392 393 if (p == fpcurproc) 394 fpcurproc = NULL; 395 396 /* Restore fp regs and fpr_cr */ 397 bcopy((struct fpreg *)context.sc_fpregs, &p->p_addr->u_pcb.pcb_fp, 398 sizeof(struct fpreg)); 399 /* XXX sc_ownedfp ? */ 400 /* XXX sc_fp_control ? */ 401 402 #ifdef DEBUG 403 if (sigdebug & SDB_FOLLOW) 404 printf("linux_rt_sigreturn(%d): returns\n", p->p_pid); 405 #endif 406 return (EJUSTRETURN); 407 } 408 409 int 410 linux_sys_rt_sigreturn(p, v, retval) 411 struct proc *p; 412 void *v; 413 register_t *retval; 414 { 415 struct linux_sys_rt_sigreturn_args /* { 416 syscallarg(struct linux_rt_sigframe *) sfp; 417 } */ *uap = v; 418 struct linux_rt_sigframe *sfp, sigframe; 419 sigset_t mask; 420 421 /* 422 * The trampoline code hands us the context. 423 * It is unsafe to keep track of it ourselves, in the event that a 424 * program jumps out of a signal handler. 425 */ 426 427 sfp = SCARG(uap, sfp); 428 429 if (ALIGN(sfp) != (u_int64_t)sfp) 430 return(EINVAL); 431 432 /* 433 * Fetch the frame structure. 434 */ 435 if (copyin((caddr_t)sfp, &sigframe, 436 sizeof(struct linux_rt_sigframe)) != 0) 437 return (EFAULT); 438 439 /* Grab the signal mask */ 440 linux_to_native_sigset(&sigframe.uc.uc_sigmask, &mask); 441 442 return(linux_restore_sigcontext(p, sigframe.uc.uc_mcontext, &mask)); 443 } 444 445 446 int 447 linux_sys_sigreturn(p, v, retval) 448 struct proc *p; 449 void *v; 450 register_t *retval; 451 { 452 struct linux_sys_sigreturn_args /* { 453 syscallarg(struct linux_sigframe *) sfp; 454 } */ *uap = v; 455 struct linux_sigframe *sfp, frame; 456 sigset_t mask; 457 458 /* 459 * The trampoline code hands us the context. 460 * It is unsafe to keep track of it ourselves, in the event that a 461 * program jumps out of a signal handler. 462 */ 463 464 sfp = SCARG(uap, sfp); 465 if (ALIGN(sfp) != (u_int64_t)sfp) 466 return(EINVAL); 467 468 /* 469 * Fetch the frame structure. 470 */ 471 if (copyin((caddr_t)sfp, &frame, sizeof(struct linux_sigframe)) != 0) 472 return(EFAULT); 473 474 /* Grab the signal mask. */ 475 /* XXX use frame.extramask */ 476 linux_old_to_native_sigset(frame.sf_sc.sc_mask, &mask); 477 478 return(linux_restore_sigcontext(p, frame.sf_sc, &mask)); 479 } 480 481 /* 482 * We come here in a last attempt to satisfy a Linux ioctl() call 483 */ 484 /* XXX XAX update this, add maps, etc... */ 485 int 486 linux_machdepioctl(p, v, retval) 487 struct proc *p; 488 void *v; 489 register_t *retval; 490 { 491 struct linux_sys_ioctl_args /* { 492 syscallarg(int) fd; 493 syscallarg(u_long) com; 494 syscallarg(caddr_t) data; 495 } */ *uap = v; 496 struct sys_ioctl_args bia; 497 u_long com; 498 499 SCARG(&bia, fd) = SCARG(uap, fd); 500 SCARG(&bia, data) = SCARG(uap, data); 501 com = SCARG(uap, com); 502 503 switch (com) { 504 default: 505 printf("linux_machdepioctl: invalid ioctl %08lx\n", com); 506 return EINVAL; 507 } 508 SCARG(&bia, com) = com; 509 return sys_ioctl(p, &bia, retval); 510 } 511 512 /* XXX XAX fix this */ 513 dev_t 514 linux_fakedev(dev) 515 dev_t dev; 516 { 517 return dev; 518 } 519 520
Indexes created Fri Oct 03 02:09:57 GMT 2025