linux_machdep.c revision 1.15.2.2
1 /* $NetBSD: linux_machdep.c,v 1.15.2.2 2001/08/30 23:43:44 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 /* XXX XAX I think this is ok. not sure though. */ 105 setregs(l, 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 lwp *l = curproc; 114 struct proc *p = l->l_proc; 115 struct linux_rt_sigframe *sfp, sigframe; 116 int onstack; 117 int fsize, rndfsize; 118 extern char linux_rt_sigcode[], linux_rt_esigcode[]; 119 120 /* Do we need to jump onto the signal stack? */ 121 onstack = (p->p_sigctx.ps_sigstk.ss_flags & (SS_DISABLE | SS_ONSTACK)) == 0 && 122 (SIGACTION(p, sig).sa_flags & SA_ONSTACK) != 0; 123 124 /* Allocate space for the signal handler context. */ 125 fsize = sizeof(struct linux_rt_sigframe); 126 rndfsize = ((fsize + 15) / 16) * 16; 127 128 if (onstack) 129 sfp = (struct linux_rt_sigframe *) 130 ((caddr_t)p->p_sigctx.ps_sigstk.ss_sp + 131 p->p_sigctx.ps_sigstk.ss_size); 132 else 133 sfp = (struct linux_rt_sigframe *)(alpha_pal_rdusp()); 134 sfp = (struct linux_rt_sigframe *)((caddr_t)sfp - rndfsize); 135 136 #ifdef DEBUG 137 if ((sigdebug & SDB_KSTACK) && (p->p_pid == sigpid)) 138 printf("linux_sendsig(%d): sig %d ssp %p usp %p\n", p->p_pid, 139 sig, &onstack, sfp); 140 #endif /* DEBUG */ 141 142 /* 143 * Build the signal context to be used by sigreturn. 144 */ 145 bzero(&sigframe.uc, sizeof(struct linux_ucontext)); 146 sigframe.uc.uc_mcontext.sc_onstack = onstack; 147 148 /* Setup potentially partial signal mask in sc_mask. */ 149 /* But get all of it in uc_sigmask */ 150 native_to_linux_old_sigset(mask, &sigframe.uc.uc_mcontext.sc_mask); 151 native_to_linux_sigset(mask, &sigframe.uc.uc_sigmask); 152 153 sigframe.uc.uc_mcontext.sc_pc = tf->tf_regs[FRAME_PC]; 154 sigframe.uc.uc_mcontext.sc_ps = ALPHA_PSL_USERMODE; 155 frametoreg(tf, (struct reg *)sigframe.uc.uc_mcontext.sc_regs); 156 sigframe.uc.uc_mcontext.sc_regs[R_SP] = alpha_pal_rdusp(); 157 158 alpha_enable_fp(l, 1); 159 sigframe.uc.uc_mcontext.sc_fpcr = alpha_read_fpcr(); 160 sigframe.uc.uc_mcontext.sc_fp_control = alpha_read_fp_c(l); 161 alpha_pal_wrfen(0); 162 163 sigframe.uc.uc_mcontext.sc_traparg_a0 = tf->tf_regs[FRAME_A0]; 164 sigframe.uc.uc_mcontext.sc_traparg_a1 = tf->tf_regs[FRAME_A1]; 165 sigframe.uc.uc_mcontext.sc_traparg_a2 = tf->tf_regs[FRAME_A2]; 166 167 /* 168 * XXX XAX Create bogus siginfo data. This can't really 169 * XXX be fixed until NetBSD has realtime signals. 170 * XXX Or we do the emuldata thing. 171 * XXX -erh 172 */ 173 bzero(&sigframe.info, sizeof(struct linux_siginfo)); 174 sigframe.info.lsi_signo = sig; 175 sigframe.info.lsi_code = LINUX_SI_USER; 176 sigframe.info.lsi_pid = p->p_pid; 177 sigframe.info.lsi_uid = p->p_ucred->cr_uid; /* Use real uid here? */ 178 179 if (copyout((caddr_t)&sigframe, (caddr_t)sfp, fsize) != 0) { 180 #ifdef DEBUG 181 if ((sigdebug & SDB_KSTACK) && p->p_pid == sigpid) 182 printf("sendsig(%d): copyout failed on sig %d\n", 183 p->p_pid, sig); 184 #endif 185 /* 186 * Process has trashed its stack; give it an illegal 187 * instruction to halt it in its tracks. 188 */ 189 sigexit(l, SIGILL); 190 /* NOTREACHED */ 191 } 192 193 /* Pass pointers to siginfo and ucontext in the regs */ 194 tf->tf_regs[FRAME_A1] = (unsigned long)&sfp->info; 195 tf->tf_regs[FRAME_A2] = (unsigned long)&sfp->uc; 196 197 /* Address of trampoline code. End up at this PC after mi_switch */ 198 tf->tf_regs[FRAME_PC] = 199 (u_int64_t)(PS_STRINGS - (linux_rt_esigcode - linux_rt_sigcode)); 200 201 /* Adjust the stack */ 202 alpha_pal_wrusp((unsigned long)sfp); 203 204 /* Remember that we're now on the signal stack. */ 205 if (onstack) 206 p->p_sigctx.ps_sigstk.ss_flags |= SS_ONSTACK; 207 } 208 209 void setup_linux_sigframe(tf, sig, mask) 210 struct trapframe *tf; 211 int sig; 212 sigset_t *mask; 213 { 214 struct lwp *l = curproc; 215 struct proc *p = l->l_proc; 216 struct linux_sigframe *sfp, sigframe; 217 int onstack; 218 int fsize, rndfsize; 219 extern char linux_sigcode[], linux_esigcode[]; 220 221 /* Do we need to jump onto the signal stack? */ 222 onstack = (p->p_sigctx.ps_sigstk.ss_flags & (SS_DISABLE | SS_ONSTACK)) == 0 && 223 (SIGACTION(p, sig).sa_flags & SA_ONSTACK) != 0; 224 225 /* Allocate space for the signal handler context. */ 226 fsize = sizeof(struct linux_sigframe); 227 rndfsize = ((fsize + 15) / 16) * 16; 228 229 if (onstack) 230 sfp = (struct linux_sigframe *) 231 ((caddr_t)p->p_sigctx.ps_sigstk.ss_sp + 232 p->p_sigctx.ps_sigstk.ss_size); 233 else 234 sfp = (struct linux_sigframe *)(alpha_pal_rdusp()); 235 sfp = (struct linux_sigframe *)((caddr_t)sfp - rndfsize); 236 237 #ifdef DEBUG 238 if ((sigdebug & SDB_KSTACK) && (p->p_pid == sigpid)) 239 printf("linux_sendsig(%d): sig %d ssp %p usp %p\n", p->p_pid, 240 sig, &onstack, sfp); 241 #endif /* DEBUG */ 242 243 /* 244 * Build the signal context to be used by sigreturn. 245 */ 246 bzero(&sigframe.sf_sc, sizeof(struct linux_ucontext)); 247 sigframe.sf_sc.sc_onstack = onstack; 248 native_to_linux_old_sigset(mask, &sigframe.sf_sc.sc_mask); 249 sigframe.sf_sc.sc_pc = tf->tf_regs[FRAME_PC]; 250 sigframe.sf_sc.sc_ps = ALPHA_PSL_USERMODE; 251 frametoreg(tf, (struct reg *)sigframe.sf_sc.sc_regs); 252 sigframe.sf_sc.sc_regs[R_SP] = alpha_pal_rdusp(); 253 254 if (l == fpcurproc) { 255 alpha_pal_wrfen(1); 256 savefpstate(&l->l_addr->u_pcb.pcb_fp); 257 alpha_pal_wrfen(0); 258 sigframe.sf_sc.sc_fpcr = l->l_addr->u_pcb.pcb_fp.fpr_cr; 259 fpcurproc = NULL; 260 } 261 /* XXX ownedfp ? etc...? */ 262 263 sigframe.sf_sc.sc_traparg_a0 = tf->tf_regs[FRAME_A0]; 264 sigframe.sf_sc.sc_traparg_a1 = tf->tf_regs[FRAME_A1]; 265 sigframe.sf_sc.sc_traparg_a2 = tf->tf_regs[FRAME_A2]; 266 267 if (copyout((caddr_t)&sigframe, (caddr_t)sfp, fsize) != 0) { 268 #ifdef DEBUG 269 if ((sigdebug & SDB_KSTACK) && p->p_pid == sigpid) 270 printf("sendsig(%d): copyout failed on sig %d\n", 271 p->p_pid, sig); 272 #endif 273 /* 274 * Process has trashed its stack; give it an illegal 275 * instruction to halt it in its tracks. 276 */ 277 sigexit(l, SIGILL); 278 /* NOTREACHED */ 279 } 280 281 /* Pass pointers to sigcontext in the regs */ 282 tf->tf_regs[FRAME_A1] = 0; 283 tf->tf_regs[FRAME_A2] = (unsigned long)&sfp->sf_sc; 284 285 /* Address of trampoline code. End up at this PC after mi_switch */ 286 tf->tf_regs[FRAME_PC] = 287 (u_int64_t)(PS_STRINGS - (linux_esigcode - linux_sigcode)); 288 289 /* Adjust the stack */ 290 alpha_pal_wrusp((unsigned long)sfp); 291 292 /* Remember that we're now on the signal stack. */ 293 if (onstack) 294 p->p_sigctx.ps_sigstk.ss_flags |= SS_ONSTACK; 295 } 296 297 /* 298 * Send an interrupt to process. 299 * 300 * Stack is set up to allow sigcode stored 301 * in u. to call routine, followed by kcall 302 * to sigreturn routine below. After sigreturn 303 * resets the signal mask, the stack, and the 304 * frame pointer, it returns to the user 305 * specified pc, psl. 306 */ 307 void 308 linux_sendsig(catcher, sig, mask, code) 309 sig_t catcher; 310 int sig; 311 sigset_t *mask; 312 u_long code; 313 { 314 struct lwp *l = curproc; 315 struct trapframe *tf = l->l_md.md_tf; 316 #ifdef notyet 317 struct linux_emuldata *edp; 318 319 /* Setup the signal frame (and part of the trapframe) */ 320 /*OLD: if (p->p_sigacts->ps_siginfo & sigmask(sig))*/ 321 /* XXX XAX this is broken now. need someplace to store what 322 XXX XAX kind of signal handler a signal has.*/ 323 #if 0 324 edp = (struct linux_emuldata *)p->p_emuldata; 325 #else 326 edp = 0; 327 #endif 328 if (edp && sigismember(&edp->ps_siginfo, sig)) 329 setup_linux_rt_sigframe(tf, sig, mask); 330 else 331 #endif /* notyet */ 332 setup_linux_sigframe(tf, sig, mask); 333 334 /* Signal handler for trampoline code */ 335 tf->tf_regs[FRAME_T12] = (u_int64_t)catcher; 336 tf->tf_regs[FRAME_A0] = native_to_linux_sig[sig]; 337 338 /* 339 * Linux has a custom restorer option. To support it we would 340 * need to store an array of restorers and a sigcode block 341 * which knew to use it. Doesn't seem worth the trouble. 342 * -erh 343 */ 344 345 #ifdef DEBUG 346 if (sigdebug & SDB_FOLLOW) 347 printf("sendsig(%d): pc %lx, catcher %lx\n", p->p_pid, 348 tf->tf_regs[FRAME_PC], tf->tf_regs[FRAME_A3]); 349 if ((sigdebug & SDB_KSTACK) && p->p_pid == sigpid) 350 printf("sendsig(%d): sig %d returns\n", p->p_pid, sig); 351 #endif 352 } 353 354 /* 355 * System call to cleanup state after a signal 356 * has been taken. Reset signal mask and 357 * stack state from context left by sendsig (above). 358 * Return to previous pc as specified by context 359 * left by sendsig. 360 * Linux real-time signals use a different sigframe, 361 * but the sigcontext is the same. 362 */ 363 364 int 365 linux_restore_sigcontext(struct lwp *l, struct linux_sigcontext context, 366 sigset_t *mask) 367 { 368 369 struct proc *p = l->l_proc; 370 /* 371 * Linux doesn't (yet) have alternate signal stacks. 372 * However, the OSF/1 sigcontext which they use has 373 * an onstack member. This could be needed in the future. 374 */ 375 if (context.sc_onstack & LINUX_SA_ONSTACK) 376 p->p_sigctx.ps_sigstk.ss_flags |= SS_ONSTACK; 377 else 378 p->p_sigctx.ps_sigstk.ss_flags &= ~SS_ONSTACK; 379 380 /* Reset the signal mask */ 381 (void) sigprocmask1(p, SIG_SETMASK, mask, 0); 382 383 /* 384 * Check for security violations. 385 * Linux doesn't allow any changes to the PSL. 386 */ 387 if (context.sc_ps != ALPHA_PSL_USERMODE) 388 return(EINVAL); 389 390 l->l_md.md_tf->tf_regs[FRAME_PC] = context.sc_pc; 391 l->l_md.md_tf->tf_regs[FRAME_PS] = context.sc_ps; 392 393 regtoframe((struct reg *)context.sc_regs, l->l_md.md_tf); 394 alpha_pal_wrusp(context.sc_regs[R_SP]); 395 396 if (l == fpcurproc) 397 fpcurproc = NULL; 398 399 /* Restore fp regs and fpr_cr */ 400 bcopy((struct fpreg *)context.sc_fpregs, &l->l_addr->u_pcb.pcb_fp, 401 sizeof(struct fpreg)); 402 /* XXX sc_ownedfp ? */ 403 /* XXX sc_fp_control ? */ 404 405 #ifdef DEBUG 406 if (sigdebug & SDB_FOLLOW) 407 printf("linux_rt_sigreturn(%d): returns\n", p->p_pid); 408 #endif 409 return (EJUSTRETURN); 410 } 411 412 int 413 linux_sys_rt_sigreturn(l, v, retval) 414 struct lwp *l; 415 void *v; 416 register_t *retval; 417 { 418 struct linux_sys_rt_sigreturn_args /* { 419 syscallarg(struct linux_rt_sigframe *) sfp; 420 } */ *uap = v; 421 struct linux_rt_sigframe *sfp, sigframe; 422 sigset_t mask; 423 424 /* 425 * The trampoline code hands us the context. 426 * It is unsafe to keep track of it ourselves, in the event that a 427 * program jumps out of a signal handler. 428 */ 429 430 sfp = SCARG(uap, sfp); 431 432 if (ALIGN(sfp) != (u_int64_t)sfp) 433 return(EINVAL); 434 435 /* 436 * Fetch the frame structure. 437 */ 438 if (copyin((caddr_t)sfp, &sigframe, 439 sizeof(struct linux_rt_sigframe)) != 0) 440 return (EFAULT); 441 442 /* Grab the signal mask */ 443 linux_to_native_sigset(&sigframe.uc.uc_sigmask, &mask); 444 445 return(linux_restore_sigcontext(l, sigframe.uc.uc_mcontext, &mask)); 446 } 447 448 449 int 450 linux_sys_sigreturn(l, v, retval) 451 struct lwp *l; 452 void *v; 453 register_t *retval; 454 { 455 struct linux_sys_sigreturn_args /* { 456 syscallarg(struct linux_sigframe *) sfp; 457 } */ *uap = v; 458 struct linux_sigframe *sfp, frame; 459 sigset_t mask; 460 461 /* 462 * The trampoline code hands us the context. 463 * It is unsafe to keep track of it ourselves, in the event that a 464 * program jumps out of a signal handler. 465 */ 466 467 sfp = SCARG(uap, sfp); 468 if (ALIGN(sfp) != (u_int64_t)sfp) 469 return(EINVAL); 470 471 /* 472 * Fetch the frame structure. 473 */ 474 if (copyin((caddr_t)sfp, &frame, sizeof(struct linux_sigframe)) != 0) 475 return(EFAULT); 476 477 /* Grab the signal mask. */ 478 /* XXX use frame.extramask */ 479 linux_old_to_native_sigset(frame.sf_sc.sc_mask, &mask); 480 481 return(linux_restore_sigcontext(l, frame.sf_sc, &mask)); 482 } 483 484 /* 485 * We come here in a last attempt to satisfy a Linux ioctl() call 486 */ 487 /* XXX XAX update this, add maps, etc... */ 488 int 489 linux_machdepioctl(p, v, retval) 490 struct proc *p; 491 void *v; 492 register_t *retval; 493 { 494 struct linux_sys_ioctl_args /* { 495 syscallarg(int) fd; 496 syscallarg(u_long) com; 497 syscallarg(caddr_t) data; 498 } */ *uap = v; 499 struct sys_ioctl_args bia; 500 u_long com; 501 502 SCARG(&bia, fd) = SCARG(uap, fd); 503 SCARG(&bia, data) = SCARG(uap, data); 504 com = SCARG(uap, com); 505 506 switch (com) { 507 default: 508 printf("linux_machdepioctl: invalid ioctl %08lx\n", com); 509 return EINVAL; 510 } 511 SCARG(&bia, com) = com; 512 /* XXX njwlwp */ 513 return sys_ioctl(curproc, &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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