linux_machdep.c revision 1.15.2.4
1 /* $NetBSD: linux_machdep.c,v 1.15.2.4 2001/10/08 20:10:47 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(l, epp, stack) 100 struct lwp *l; 101 struct exec_package *epp; 102 u_long stack; 103 { 104 #ifdef DEBUG 105 struct trapframe *tfp = l->l_md.md_tf; 106 #endif 107 108 setregs(l, 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 lwp *l = curproc; 124 struct proc *p = l->l_proc; 125 struct linux_rt_sigframe *sfp, sigframe; 126 int onstack; 127 int fsize, rndfsize; 128 extern char linux_rt_sigcode[], linux_rt_esigcode[]; 129 130 /* Do we need to jump onto the signal stack? */ 131 onstack = (p->p_sigctx.ps_sigstk.ss_flags & (SS_DISABLE | SS_ONSTACK)) == 0 && 132 (SIGACTION(p, sig).sa_flags & SA_ONSTACK) != 0; 133 134 /* Allocate space for the signal handler context. */ 135 fsize = sizeof(struct linux_rt_sigframe); 136 rndfsize = ((fsize + 15) / 16) * 16; 137 138 if (onstack) 139 sfp = (struct linux_rt_sigframe *) 140 ((caddr_t)p->p_sigctx.ps_sigstk.ss_sp + 141 p->p_sigctx.ps_sigstk.ss_size); 142 else 143 sfp = (struct linux_rt_sigframe *)(alpha_pal_rdusp()); 144 sfp = (struct linux_rt_sigframe *)((caddr_t)sfp - rndfsize); 145 146 #ifdef DEBUG 147 if ((sigdebug & SDB_KSTACK) && (p->p_pid == sigpid)) 148 printf("linux_sendsig(%d): sig %d ssp %p usp %p\n", p->p_pid, 149 sig, &onstack, sfp); 150 #endif /* DEBUG */ 151 152 /* 153 * Build the signal context to be used by sigreturn. 154 */ 155 bzero(&sigframe.uc, sizeof(struct linux_ucontext)); 156 sigframe.uc.uc_mcontext.sc_onstack = onstack; 157 158 /* Setup potentially partial signal mask in sc_mask. */ 159 /* But get all of it in uc_sigmask */ 160 native_to_linux_old_sigset(mask, &sigframe.uc.uc_mcontext.sc_mask); 161 native_to_linux_sigset(mask, &sigframe.uc.uc_sigmask); 162 163 sigframe.uc.uc_mcontext.sc_pc = tf->tf_regs[FRAME_PC]; 164 sigframe.uc.uc_mcontext.sc_ps = ALPHA_PSL_USERMODE; 165 frametoreg(tf, (struct reg *)sigframe.uc.uc_mcontext.sc_regs); 166 sigframe.uc.uc_mcontext.sc_regs[R_SP] = alpha_pal_rdusp(); 167 168 alpha_enable_fp(l, 1); 169 sigframe.uc.uc_mcontext.sc_fpcr = alpha_read_fpcr(); 170 sigframe.uc.uc_mcontext.sc_fp_control = alpha_read_fp_c(l); 171 alpha_pal_wrfen(0); 172 173 sigframe.uc.uc_mcontext.sc_traparg_a0 = tf->tf_regs[FRAME_A0]; 174 sigframe.uc.uc_mcontext.sc_traparg_a1 = tf->tf_regs[FRAME_A1]; 175 sigframe.uc.uc_mcontext.sc_traparg_a2 = tf->tf_regs[FRAME_A2]; 176 177 /* 178 * XXX XAX Create bogus siginfo data. This can't really 179 * XXX be fixed until NetBSD has realtime signals. 180 * XXX Or we do the emuldata thing. 181 * XXX -erh 182 */ 183 bzero(&sigframe.info, sizeof(struct linux_siginfo)); 184 sigframe.info.lsi_signo = sig; 185 sigframe.info.lsi_code = LINUX_SI_USER; 186 sigframe.info.lsi_pid = p->p_pid; 187 sigframe.info.lsi_uid = p->p_ucred->cr_uid; /* Use real uid here? */ 188 189 if (copyout((caddr_t)&sigframe, (caddr_t)sfp, fsize) != 0) { 190 #ifdef DEBUG 191 if ((sigdebug & SDB_KSTACK) && p->p_pid == sigpid) 192 printf("sendsig(%d): copyout failed on sig %d\n", 193 p->p_pid, sig); 194 #endif 195 /* 196 * Process has trashed its stack; give it an illegal 197 * instruction to halt it in its tracks. 198 */ 199 sigexit(l, SIGILL); 200 /* NOTREACHED */ 201 } 202 203 /* Pass pointers to siginfo and ucontext in the regs */ 204 tf->tf_regs[FRAME_A1] = (unsigned long)&sfp->info; 205 tf->tf_regs[FRAME_A2] = (unsigned long)&sfp->uc; 206 207 /* Address of trampoline code. End up at this PC after mi_switch */ 208 tf->tf_regs[FRAME_PC] = 209 (u_int64_t)(PS_STRINGS - (linux_rt_esigcode - linux_rt_sigcode)); 210 211 /* Adjust the stack */ 212 alpha_pal_wrusp((unsigned long)sfp); 213 214 /* Remember that we're now on the signal stack. */ 215 if (onstack) 216 p->p_sigctx.ps_sigstk.ss_flags |= SS_ONSTACK; 217 } 218 219 void setup_linux_sigframe(tf, sig, mask) 220 struct trapframe *tf; 221 int sig; 222 sigset_t *mask; 223 { 224 struct lwp *l = curproc; 225 struct proc *p = l->l_proc; 226 struct linux_sigframe *sfp, sigframe; 227 int onstack; 228 int fsize, rndfsize; 229 extern char linux_sigcode[], linux_esigcode[]; 230 231 /* Do we need to jump onto the signal stack? */ 232 onstack = (p->p_sigctx.ps_sigstk.ss_flags & (SS_DISABLE | SS_ONSTACK)) == 0 && 233 (SIGACTION(p, sig).sa_flags & SA_ONSTACK) != 0; 234 235 /* Allocate space for the signal handler context. */ 236 fsize = sizeof(struct linux_sigframe); 237 rndfsize = ((fsize + 15) / 16) * 16; 238 239 if (onstack) 240 sfp = (struct linux_sigframe *) 241 ((caddr_t)p->p_sigctx.ps_sigstk.ss_sp + 242 p->p_sigctx.ps_sigstk.ss_size); 243 else 244 sfp = (struct linux_sigframe *)(alpha_pal_rdusp()); 245 sfp = (struct linux_sigframe *)((caddr_t)sfp - rndfsize); 246 247 #ifdef DEBUG 248 if ((sigdebug & SDB_KSTACK) && (p->p_pid == sigpid)) 249 printf("linux_sendsig(%d): sig %d ssp %p usp %p\n", p->p_pid, 250 sig, &onstack, sfp); 251 #endif /* DEBUG */ 252 253 /* 254 * Build the signal context to be used by sigreturn. 255 */ 256 bzero(&sigframe.sf_sc, sizeof(struct linux_ucontext)); 257 sigframe.sf_sc.sc_onstack = onstack; 258 native_to_linux_old_sigset(mask, &sigframe.sf_sc.sc_mask); 259 sigframe.sf_sc.sc_pc = tf->tf_regs[FRAME_PC]; 260 sigframe.sf_sc.sc_ps = ALPHA_PSL_USERMODE; 261 frametoreg(tf, (struct reg *)sigframe.sf_sc.sc_regs); 262 sigframe.sf_sc.sc_regs[R_SP] = alpha_pal_rdusp(); 263 264 if (l == fpcurproc) { 265 alpha_pal_wrfen(1); 266 savefpstate(&l->l_addr->u_pcb.pcb_fp); 267 alpha_pal_wrfen(0); 268 sigframe.sf_sc.sc_fpcr = l->l_addr->u_pcb.pcb_fp.fpr_cr; 269 fpcurproc = NULL; 270 } 271 /* XXX ownedfp ? etc...? */ 272 273 sigframe.sf_sc.sc_traparg_a0 = tf->tf_regs[FRAME_A0]; 274 sigframe.sf_sc.sc_traparg_a1 = tf->tf_regs[FRAME_A1]; 275 sigframe.sf_sc.sc_traparg_a2 = tf->tf_regs[FRAME_A2]; 276 277 if (copyout((caddr_t)&sigframe, (caddr_t)sfp, fsize) != 0) { 278 #ifdef DEBUG 279 if ((sigdebug & SDB_KSTACK) && p->p_pid == sigpid) 280 printf("sendsig(%d): copyout failed on sig %d\n", 281 p->p_pid, sig); 282 #endif 283 /* 284 * Process has trashed its stack; give it an illegal 285 * instruction to halt it in its tracks. 286 */ 287 sigexit(l, SIGILL); 288 /* NOTREACHED */ 289 } 290 291 /* Pass pointers to sigcontext in the regs */ 292 tf->tf_regs[FRAME_A1] = 0; 293 tf->tf_regs[FRAME_A2] = (unsigned long)&sfp->sf_sc; 294 295 /* Address of trampoline code. End up at this PC after mi_switch */ 296 tf->tf_regs[FRAME_PC] = 297 (u_int64_t)(PS_STRINGS - (linux_esigcode - linux_sigcode)); 298 299 /* Adjust the stack */ 300 alpha_pal_wrusp((unsigned long)sfp); 301 302 /* Remember that we're now on the signal stack. */ 303 if (onstack) 304 p->p_sigctx.ps_sigstk.ss_flags |= SS_ONSTACK; 305 } 306 307 /* 308 * Send an interrupt to process. 309 * 310 * Stack is set up to allow sigcode stored 311 * in u. to call routine, followed by kcall 312 * to sigreturn routine below. After sigreturn 313 * resets the signal mask, the stack, and the 314 * frame pointer, it returns to the user 315 * specified pc, psl. 316 */ 317 void 318 linux_sendsig(catcher, sig, mask, code) 319 sig_t catcher; 320 int sig; 321 sigset_t *mask; 322 u_long code; 323 { 324 struct lwp *l = curproc; 325 struct trapframe *tf = l->l_md.md_tf; 326 #ifdef notyet 327 struct linux_emuldata *edp; 328 329 /* Setup the signal frame (and part of the trapframe) */ 330 /*OLD: if (p->p_sigacts->ps_siginfo & sigmask(sig))*/ 331 /* XXX XAX this is broken now. need someplace to store what 332 XXX XAX kind of signal handler a signal has.*/ 333 #if 0 334 edp = (struct linux_emuldata *)p->p_emuldata; 335 #else 336 edp = 0; 337 #endif 338 if (edp && sigismember(&edp->ps_siginfo, sig)) 339 setup_linux_rt_sigframe(tf, sig, mask); 340 else 341 #endif /* notyet */ 342 setup_linux_sigframe(tf, sig, mask); 343 344 /* Signal handler for trampoline code */ 345 tf->tf_regs[FRAME_T12] = (u_int64_t)catcher; 346 tf->tf_regs[FRAME_A0] = native_to_linux_sig[sig]; 347 348 /* 349 * Linux has a custom restorer option. To support it we would 350 * need to store an array of restorers and a sigcode block 351 * which knew to use it. Doesn't seem worth the trouble. 352 * -erh 353 */ 354 355 #ifdef DEBUG 356 if (sigdebug & SDB_FOLLOW) 357 printf("sendsig(%d): pc %lx, catcher %lx\n", l->l_proc->p_pid, 358 tf->tf_regs[FRAME_PC], tf->tf_regs[FRAME_A3]); 359 if ((sigdebug & SDB_KSTACK) && l->l_proc->p_pid == sigpid) 360 printf("sendsig(%d): sig %d returns\n", l->l_proc->p_pid, sig); 361 #endif 362 } 363 364 /* 365 * System call to cleanup state after a signal 366 * has been taken. Reset signal mask and 367 * stack state from context left by sendsig (above). 368 * Return to previous pc as specified by context 369 * left by sendsig. 370 * Linux real-time signals use a different sigframe, 371 * but the sigcontext is the same. 372 */ 373 374 int 375 linux_restore_sigcontext(struct lwp *l, struct linux_sigcontext context, 376 sigset_t *mask) 377 { 378 379 struct proc *p = l->l_proc; 380 /* 381 * Linux doesn't (yet) have alternate signal stacks. 382 * However, the OSF/1 sigcontext which they use has 383 * an onstack member. This could be needed in the future. 384 */ 385 if (context.sc_onstack & LINUX_SA_ONSTACK) 386 p->p_sigctx.ps_sigstk.ss_flags |= SS_ONSTACK; 387 else 388 p->p_sigctx.ps_sigstk.ss_flags &= ~SS_ONSTACK; 389 390 /* Reset the signal mask */ 391 (void) sigprocmask1(p, SIG_SETMASK, mask, 0); 392 393 /* 394 * Check for security violations. 395 * Linux doesn't allow any changes to the PSL. 396 */ 397 if (context.sc_ps != ALPHA_PSL_USERMODE) 398 return(EINVAL); 399 400 l->l_md.md_tf->tf_regs[FRAME_PC] = context.sc_pc; 401 l->l_md.md_tf->tf_regs[FRAME_PS] = context.sc_ps; 402 403 regtoframe((struct reg *)context.sc_regs, l->l_md.md_tf); 404 alpha_pal_wrusp(context.sc_regs[R_SP]); 405 406 if (l == fpcurproc) 407 fpcurproc = NULL; 408 409 /* Restore fp regs and fpr_cr */ 410 bcopy((struct fpreg *)context.sc_fpregs, &l->l_addr->u_pcb.pcb_fp, 411 sizeof(struct fpreg)); 412 /* XXX sc_ownedfp ? */ 413 /* XXX sc_fp_control ? */ 414 415 #ifdef DEBUG 416 if (sigdebug & SDB_FOLLOW) 417 printf("linux_rt_sigreturn(%d): returns\n", p->p_pid); 418 #endif 419 return (EJUSTRETURN); 420 } 421 422 int 423 linux_sys_rt_sigreturn(l, v, retval) 424 struct lwp *l; 425 void *v; 426 register_t *retval; 427 { 428 struct linux_sys_rt_sigreturn_args /* { 429 syscallarg(struct linux_rt_sigframe *) sfp; 430 } */ *uap = v; 431 struct linux_rt_sigframe *sfp, sigframe; 432 sigset_t mask; 433 434 /* 435 * The trampoline code hands us the context. 436 * It is unsafe to keep track of it ourselves, in the event that a 437 * program jumps out of a signal handler. 438 */ 439 440 sfp = SCARG(uap, sfp); 441 442 if (ALIGN(sfp) != (u_int64_t)sfp) 443 return(EINVAL); 444 445 /* 446 * Fetch the frame structure. 447 */ 448 if (copyin((caddr_t)sfp, &sigframe, 449 sizeof(struct linux_rt_sigframe)) != 0) 450 return (EFAULT); 451 452 /* Grab the signal mask */ 453 linux_to_native_sigset(&sigframe.uc.uc_sigmask, &mask); 454 455 return(linux_restore_sigcontext(l, sigframe.uc.uc_mcontext, &mask)); 456 } 457 458 459 int 460 linux_sys_sigreturn(l, v, retval) 461 struct lwp *l; 462 void *v; 463 register_t *retval; 464 { 465 struct linux_sys_sigreturn_args /* { 466 syscallarg(struct linux_sigframe *) sfp; 467 } */ *uap = v; 468 struct linux_sigframe *sfp, frame; 469 sigset_t mask; 470 471 /* 472 * The trampoline code hands us the context. 473 * It is unsafe to keep track of it ourselves, in the event that a 474 * program jumps out of a signal handler. 475 */ 476 477 sfp = SCARG(uap, sfp); 478 if (ALIGN(sfp) != (u_int64_t)sfp) 479 return(EINVAL); 480 481 /* 482 * Fetch the frame structure. 483 */ 484 if (copyin((caddr_t)sfp, &frame, sizeof(struct linux_sigframe)) != 0) 485 return(EFAULT); 486 487 /* Grab the signal mask. */ 488 /* XXX use frame.extramask */ 489 linux_old_to_native_sigset(frame.sf_sc.sc_mask, &mask); 490 491 return(linux_restore_sigcontext(l, frame.sf_sc, &mask)); 492 } 493 494 /* 495 * We come here in a last attempt to satisfy a Linux ioctl() call 496 */ 497 /* XXX XAX update this, add maps, etc... */ 498 int 499 linux_machdepioctl(p, v, retval) 500 struct proc *p; 501 void *v; 502 register_t *retval; 503 { 504 struct linux_sys_ioctl_args /* { 505 syscallarg(int) fd; 506 syscallarg(u_long) com; 507 syscallarg(caddr_t) data; 508 } */ *uap = v; 509 struct sys_ioctl_args bia; 510 u_long com; 511 512 SCARG(&bia, fd) = SCARG(uap, fd); 513 SCARG(&bia, data) = SCARG(uap, data); 514 com = SCARG(uap, com); 515 516 switch (com) { 517 default: 518 printf("linux_machdepioctl: invalid ioctl %08lx\n", com); 519 return EINVAL; 520 } 521 SCARG(&bia, com) = com; 522 /* XXX njwlwp */ 523 return sys_ioctl(curproc, &bia, retval); 524 } 525 526 /* XXX XAX fix this */ 527 dev_t 528 linux_fakedev(dev) 529 dev_t dev; 530 { 531 return dev; 532 } 533 534
Indexes created Fri Oct 03 02:09:57 GMT 2025