linux_machdep.c revision 1.49.10.1
1 /* $NetBSD: linux_machdep.c,v 1.49.10.1 2017/12/03 11:36:53 jdolecek 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 * 19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 29 * POSSIBILITY OF SUCH DAMAGE. 30 * 31 * Based on sys/arch/i386/i386/linux_machdep.c: 32 * linux_machdep.c,v 1.42 1998/09/11 12:50:06 mycroft Exp 33 * written by Frank van der Linden 34 * 35 */ 36 37 #include <sys/cdefs.h> 38 __KERNEL_RCSID(0, "$NetBSD: linux_machdep.c,v 1.49.10.1 2017/12/03 11:36:53 jdolecek Exp $"); 39 40 #include <sys/param.h> 41 #include <sys/systm.h> 42 #include <sys/signalvar.h> 43 #include <sys/kernel.h> 44 #include <sys/proc.h> 45 #include <sys/buf.h> 46 #include <sys/reboot.h> 47 #include <sys/conf.h> 48 #include <sys/exec.h> 49 #include <sys/file.h> 50 #include <sys/callout.h> 51 #include <sys/mbuf.h> 52 #include <sys/msgbuf.h> 53 #include <sys/mount.h> 54 #include <sys/vnode.h> 55 #include <sys/device.h> 56 #include <sys/syscallargs.h> 57 #include <sys/filedesc.h> 58 #include <sys/exec_elf.h> 59 #include <sys/ioctl.h> 60 #include <sys/kauth.h> 61 62 #include <uvm/uvm_extern.h> 63 64 #include <compat/linux/common/linux_types.h> 65 #include <compat/linux/common/linux_signal.h> 66 #include <compat/linux/common/linux_siginfo.h> 67 #include <compat/linux/common/linux_util.h> 68 #include <compat/linux/common/linux_ioctl.h> 69 #include <compat/linux/common/linux_exec.h> 70 #include <compat/linux/common/linux_machdep.h> 71 #include <compat/linux/common/linux_emuldata.h> 72 73 #include <compat/linux/linux_syscallargs.h> 74 75 #include <machine/alpha.h> 76 #include <machine/reg.h> 77 78 #if defined(_KERNEL_OPT) 79 #include "wsdisplay.h" 80 #endif 81 #if (NWSDISPLAY >0) 82 #include <dev/wscons/wsdisplay_usl_io.h> 83 #endif 84 #ifdef DEBUG 85 #include <machine/sigdebug.h> 86 #endif 87 88 /* 89 * Deal with some alpha-specific things in the Linux emulation code. 90 */ 91 92 void 93 linux_setregs(struct lwp *l, struct exec_package *epp, vaddr_t stack) 94 { 95 #ifdef DEBUG 96 struct trapframe *tfp = l->l_md.md_tf; 97 #endif 98 99 setregs(l, epp, stack); 100 #ifdef DEBUG 101 /* 102 * Linux has registers set to zero on entry; for DEBUG kernels 103 * the alpha setregs() fills registers with 0xbabefacedeadbeef. 104 */ 105 memset(tfp->tf_regs, 0, FRAME_SIZE * sizeof tfp->tf_regs[0]); 106 #endif 107 } 108 109 void 110 setup_linux_rt_sigframe(struct trapframe *tf, const ksiginfo_t *ksi, 111 const sigset_t *mask) 112 { 113 struct lwp *l = curlwp; 114 struct proc *p = l->l_proc; 115 struct linux_rt_sigframe *sfp, sigframe; 116 int onstack, error; 117 int fsize, rndfsize; 118 int sig = ksi->ksi_signo; 119 extern char linux_rt_sigcode[], linux_rt_esigcode[]; 120 121 /* Do we need to jump onto the signal stack? */ 122 onstack = (l->l_sigstk.ss_flags & (SS_DISABLE | SS_ONSTACK)) == 0 && 123 (SIGACTION(p, sig).sa_flags & SA_ONSTACK) != 0; 124 125 /* Allocate space for the signal handler context. */ 126 fsize = sizeof(struct linux_rt_sigframe); 127 rndfsize = ((fsize + 15) / 16) * 16; 128 129 if (onstack) 130 sfp = (struct linux_rt_sigframe *) 131 ((char *)l->l_sigstk.ss_sp + l->l_sigstk.ss_size); 132 else 133 sfp = (struct linux_rt_sigframe *)(alpha_pal_rdusp()); 134 sfp = (struct linux_rt_sigframe *)((char *)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 memset(&sigframe.uc, 0, 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(&sigframe.uc.uc_mcontext.sc_mask, mask); 151 native_to_linux_sigset(&sigframe.uc.uc_sigmask, mask); 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 fpu_load(); 159 alpha_pal_wrfen(1); 160 sigframe.uc.uc_mcontext.sc_fpcr = alpha_read_fpcr(); 161 sigframe.uc.uc_mcontext.sc_fp_control = alpha_read_fp_c(l); 162 alpha_pal_wrfen(0); 163 164 sigframe.uc.uc_mcontext.sc_traparg_a0 = tf->tf_regs[FRAME_A0]; 165 sigframe.uc.uc_mcontext.sc_traparg_a1 = tf->tf_regs[FRAME_A1]; 166 sigframe.uc.uc_mcontext.sc_traparg_a2 = tf->tf_regs[FRAME_A2]; 167 native_to_linux_siginfo(&sigframe.info, &ksi->ksi_info); 168 sendsig_reset(l, sig); 169 mutex_exit(p->p_lock); 170 error = copyout((void *)&sigframe, (void *)sfp, fsize); 171 mutex_enter(p->p_lock); 172 173 if (error != 0) { 174 #ifdef DEBUG 175 if ((sigdebug & SDB_KSTACK) && p->p_pid == sigpid) 176 printf("sendsig(%d): copyout failed on sig %d\n", 177 p->p_pid, sig); 178 #endif 179 /* 180 * Process has trashed its stack; give it an illegal 181 * instruction to halt it in its tracks. 182 */ 183 sigexit(l, SIGILL); 184 /* NOTREACHED */ 185 } 186 187 /* Pass pointers to siginfo and ucontext in the regs */ 188 tf->tf_regs[FRAME_A1] = (unsigned long)&sfp->info; 189 tf->tf_regs[FRAME_A2] = (unsigned long)&sfp->uc; 190 191 /* Address of trampoline code. End up at this PC after mi_switch */ 192 tf->tf_regs[FRAME_PC] = 193 (u_int64_t)(p->p_psstrp - (linux_rt_esigcode - linux_rt_sigcode)); 194 195 /* Adjust the stack */ 196 alpha_pal_wrusp((unsigned long)sfp); 197 198 /* Remember that we're now on the signal stack. */ 199 if (onstack) 200 l->l_sigstk.ss_flags |= SS_ONSTACK; 201 } 202 203 void setup_linux_sigframe(struct trapframe *tf, const ksiginfo_t *ksi, 204 const sigset_t *mask) 205 { 206 struct lwp *l = curlwp; 207 struct proc *p = l->l_proc; 208 struct linux_sigframe *sfp, sigframe; 209 int onstack, error; 210 int fsize, rndfsize; 211 int sig = ksi->ksi_signo; 212 extern char linux_sigcode[], linux_esigcode[]; 213 214 /* Do we need to jump onto the signal stack? */ 215 onstack = (l->l_sigstk.ss_flags & (SS_DISABLE | SS_ONSTACK)) == 0 && 216 (SIGACTION(p, sig).sa_flags & SA_ONSTACK) != 0; 217 218 /* Allocate space for the signal handler context. */ 219 fsize = sizeof(struct linux_sigframe); 220 rndfsize = ((fsize + 15) / 16) * 16; 221 222 if (onstack) 223 sfp = (struct linux_sigframe *) 224 ((char *)l->l_sigstk.ss_sp + l->l_sigstk.ss_size); 225 else 226 sfp = (struct linux_sigframe *)(alpha_pal_rdusp()); 227 sfp = (struct linux_sigframe *)((char *)sfp - rndfsize); 228 229 #ifdef DEBUG 230 if ((sigdebug & SDB_KSTACK) && (p->p_pid == sigpid)) 231 printf("linux_sendsig(%d): sig %d ssp %p usp %p\n", p->p_pid, 232 sig, &onstack, sfp); 233 #endif /* DEBUG */ 234 235 /* 236 * Build the signal context to be used by sigreturn. 237 */ 238 memset(&sigframe.sf_sc, 0, sizeof(struct linux_sigcontext)); 239 sigframe.sf_sc.sc_onstack = onstack; 240 native_to_linux_old_sigset(&sigframe.sf_sc.sc_mask, mask); 241 sigframe.sf_sc.sc_pc = tf->tf_regs[FRAME_PC]; 242 sigframe.sf_sc.sc_ps = ALPHA_PSL_USERMODE; 243 frametoreg(tf, (struct reg *)sigframe.sf_sc.sc_regs); 244 sigframe.sf_sc.sc_regs[R_SP] = alpha_pal_rdusp(); 245 246 if (l == fpcurlwp) { 247 struct pcb *pcb = lwp_getpcb(l); 248 249 alpha_pal_wrfen(1); 250 savefpstate(&pcb->pcb_fp); 251 alpha_pal_wrfen(0); 252 sigframe.sf_sc.sc_fpcr = pcb->pcb_fp.fpr_cr; 253 fpcurlwp = NULL; 254 } 255 /* XXX ownedfp ? etc...? */ 256 257 sigframe.sf_sc.sc_traparg_a0 = tf->tf_regs[FRAME_A0]; 258 sigframe.sf_sc.sc_traparg_a1 = tf->tf_regs[FRAME_A1]; 259 sigframe.sf_sc.sc_traparg_a2 = tf->tf_regs[FRAME_A2]; 260 261 sendsig_reset(l, sig); 262 mutex_exit(p->p_lock); 263 error = copyout((void *)&sigframe, (void *)sfp, fsize); 264 mutex_enter(p->p_lock); 265 266 if (error != 0) { 267 #ifdef DEBUG 268 if ((sigdebug & SDB_KSTACK) && p->p_pid == sigpid) 269 printf("sendsig(%d): copyout failed on sig %d\n", 270 p->p_pid, sig); 271 #endif 272 /* 273 * Process has trashed its stack; give it an illegal 274 * instruction to halt it in its tracks. 275 */ 276 sigexit(l, SIGILL); 277 /* NOTREACHED */ 278 } 279 280 /* Pass pointers to sigcontext in the regs */ 281 tf->tf_regs[FRAME_A1] = 0; 282 tf->tf_regs[FRAME_A2] = (unsigned long)&sfp->sf_sc; 283 284 /* Address of trampoline code. End up at this PC after mi_switch */ 285 tf->tf_regs[FRAME_PC] = 286 (u_int64_t)(p->p_psstrp - (linux_esigcode - linux_sigcode)); 287 288 /* Adjust the stack */ 289 alpha_pal_wrusp((unsigned long)sfp); 290 291 /* Remember that we're now on the signal stack. */ 292 if (onstack) 293 l->l_sigstk.ss_flags |= SS_ONSTACK; 294 } 295 296 /* 297 * Send an interrupt to process. 298 * 299 * Stack is set up to allow sigcode stored 300 * in u. to call routine, followed by kcall 301 * to sigreturn routine below. After sigreturn 302 * resets the signal mask, the stack, and the 303 * frame pointer, it returns to the user 304 * specified pc, psl. 305 */ 306 void 307 linux_sendsig(const ksiginfo_t *ksi, const sigset_t *mask) 308 { 309 struct lwp *l = curlwp; 310 struct proc *p = l->l_proc; 311 struct trapframe *tf = l->l_md.md_tf; 312 const int sig = ksi->ksi_signo; 313 sig_t catcher = SIGACTION(p, sig).sa_handler; 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, ksi, mask); 328 else 329 #endif /* notyet */ 330 setup_linux_sigframe(tf, ksi, 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_signo[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", l->l_proc->p_pid, 346 tf->tf_regs[FRAME_PC], tf->tf_regs[FRAME_A3]); 347 if ((sigdebug & SDB_KSTACK) && l->l_proc->p_pid == sigpid) 348 printf("sendsig(%d): sig %d returns\n", l->l_proc->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 lwp *l, struct linux_sigcontext context, 364 sigset_t *mask) 365 { 366 struct proc *p = l->l_proc; 367 struct pcb *pcb; 368 369 /* 370 * Linux doesn't (yet) have alternate signal stacks. 371 * However, the OSF/1 sigcontext which they use has 372 * an onstack member. This could be needed in the future. 373 */ 374 mutex_enter(p->p_lock); 375 if (context.sc_onstack & LINUX_SA_ONSTACK) 376 l->l_sigstk.ss_flags |= SS_ONSTACK; 377 else 378 l->l_sigstk.ss_flags &= ~SS_ONSTACK; 379 380 /* Reset the signal mask */ 381 (void) sigprocmask1(l, SIG_SETMASK, mask, 0); 382 mutex_exit(p->p_lock); 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 l->l_md.md_tf->tf_regs[FRAME_PC] = context.sc_pc; 392 l->l_md.md_tf->tf_regs[FRAME_PS] = context.sc_ps; 393 394 regtoframe((struct reg *)context.sc_regs, l->l_md.md_tf); 395 alpha_pal_wrusp(context.sc_regs[R_SP]); 396 397 if (l == fpcurlwp) 398 fpcurlwp = NULL; 399 400 /* Restore fp regs and fpr_cr */ 401 pcb = lwp_getpcb(l); 402 memcpy(&pcb->pcb_fp, (struct fpreg *)context.sc_fpregs, 403 sizeof(struct fpreg)); 404 /* XXX sc_ownedfp ? */ 405 /* XXX sc_fp_control ? */ 406 407 #ifdef DEBUG 408 if (sigdebug & SDB_FOLLOW) 409 printf("linux_rt_sigreturn(%d): returns\n", p->p_pid); 410 #endif 411 return (EJUSTRETURN); 412 } 413 414 int 415 linux_sys_rt_sigreturn(struct lwp *l, const struct linux_sys_rt_sigreturn_args *uap, register_t *retval) 416 { 417 /* { 418 syscallarg(struct linux_rt_sigframe *) sfp; 419 } */ 420 struct linux_rt_sigframe *sfp, sigframe; 421 sigset_t mask; 422 423 /* 424 * The trampoline code hands us the context. 425 * It is unsafe to keep track of it ourselves, in the event that a 426 * program jumps out of a signal handler. 427 */ 428 429 sfp = SCARG(uap, sfp); 430 431 if (ALIGN(sfp) != (u_int64_t)sfp) 432 return(EINVAL); 433 434 /* 435 * Fetch the frame structure. 436 */ 437 if (copyin((void *)sfp, &sigframe, 438 sizeof(struct linux_rt_sigframe)) != 0) 439 return (EFAULT); 440 441 /* Grab the signal mask */ 442 linux_to_native_sigset(&mask, &sigframe.uc.uc_sigmask); 443 444 return(linux_restore_sigcontext(l, sigframe.uc.uc_mcontext, &mask)); 445 } 446 447 448 int 449 linux_sys_sigreturn(struct lwp *l, const struct linux_sys_sigreturn_args *uap, register_t *retval) 450 { 451 /* { 452 syscallarg(struct linux_sigframe *) sfp; 453 } */ 454 struct linux_sigframe *sfp, frame; 455 sigset_t mask; 456 457 /* 458 * The trampoline code hands us the context. 459 * It is unsafe to keep track of it ourselves, in the event that a 460 * program jumps out of a signal handler. 461 */ 462 463 sfp = SCARG(uap, sfp); 464 if (ALIGN(sfp) != (u_int64_t)sfp) 465 return(EINVAL); 466 467 /* 468 * Fetch the frame structure. 469 */ 470 if (copyin((void *)sfp, &frame, sizeof(struct linux_sigframe)) != 0) 471 return(EFAULT); 472 473 /* Grab the signal mask. */ 474 /* XXX use frame.extramask */ 475 linux_old_to_native_sigset(&mask, frame.sf_sc.sc_mask); 476 477 return(linux_restore_sigcontext(l, frame.sf_sc, &mask)); 478 } 479 480 /* 481 * We come here in a last attempt to satisfy a Linux ioctl() call 482 */ 483 /* XXX XAX update this, add maps, etc... */ 484 int 485 linux_machdepioctl(struct lwp *l, const struct linux_sys_ioctl_args *uap, register_t *retval) 486 { 487 /* { 488 syscallarg(int) fd; 489 syscallarg(u_long) com; 490 syscallarg(void *) data; 491 } */ 492 struct sys_ioctl_args bia; 493 u_long com; 494 495 SCARG(&bia, fd) = SCARG(uap, fd); 496 SCARG(&bia, data) = SCARG(uap, data); 497 com = SCARG(uap, com); 498 499 switch (com) { 500 default: 501 printf("linux_machdepioctl: invalid ioctl %08lx\n", com); 502 return EINVAL; 503 } 504 SCARG(&bia, com) = com; 505 return sys_ioctl(l, &bia, retval); 506 } 507 508 /* XXX XAX fix this */ 509 dev_t 510 linux_fakedev(dev_t dev, int raw) 511 { 512 return dev; 513 } 514 515 int 516 linux_usertrap(struct lwp *l, vaddr_t trapaddr, void *arg) 517 { 518 return 0; 519 } 520
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