sys/compat/linux/arch/alpha/linux_machdep.c

   1 /*      $NetBSD: linux_machdep.c,v 1.44 2009/03/18 17:06:48 cegger 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 1.44 2009/03/18 17:06:48 cegger 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/malloc.h>
  52 #include <sys/mbuf.h>
  53 #include <sys/msgbuf.h>
  54 #include <sys/mount.h>
  55 #include <sys/vnode.h>
  56 #include <sys/device.h>
  57 #include <sys/syscallargs.h>
  58 #include <sys/filedesc.h>
  59 #include <sys/exec_elf.h>
  60 #include <sys/ioctl.h>
  61 #include <sys/kauth.h>
  62
  63 #include <uvm/uvm_extern.h>
  64
  65 #include <compat/linux/common/linux_types.h>
  66 #include <compat/linux/common/linux_signal.h>
  67 #include <compat/linux/common/linux_siginfo.h>
  68 #include <compat/linux/common/linux_util.h>
  69 #include <compat/linux/common/linux_ioctl.h>
  70 #include <compat/linux/common/linux_exec.h>
  71 #include <compat/linux/common/linux_machdep.h>
  72 #include <compat/linux/common/linux_emuldata.h>
  73
  74 #include <compat/linux/linux_syscallargs.h>
  75
  76 #include <machine/alpha.h>
  77 #include <machine/reg.h>
  78
  79 #if defined(_KERNEL_OPT)
  80 #include "wsdisplay.h"
  81 #endif
  82 #if (NWSDISPLAY >0)
  83 #include <dev/wscons/wsdisplay_usl_io.h>
  84 #endif
  85 #ifdef DEBUG
  86 #include <machine/sigdebug.h>
  87 #endif
  88
  89 /*
  90  * Deal with some alpha-specific things in the Linux emulation code.
  91  */
  92
  93 void
  94 linux_setregs(struct lwp *l, struct exec_package *epp, u_long stack)
  95 {
  96 #ifdef DEBUG
  97         struct trapframe *tfp = l->l_md.md_tf;
  98 #endif
  99
 100         setregs(l, epp, stack);
 101 #ifdef DEBUG
 102         /*
 103          * Linux has registers set to zero on entry; for DEBUG kernels
 104          * the alpha setregs() fills registers with 0xbabefacedeadbeef.
 105          */
 106         memset(tfp->tf_regs, 0, FRAME_SIZE * sizeof tfp->tf_regs[0]);
 107 #endif
 108 }
 109
 110 void
 111 setup_linux_rt_sigframe(struct trapframe *tf, int sig, 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         extern char linux_rt_sigcode[], linux_rt_esigcode[];
 119
 120         /* Do we need to jump onto the signal stack? */
 121         onstack = (l->l_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                     ((char *)l->l_sigstk.ss_sp + l->l_sigstk.ss_size);
 131         else
 132                 sfp = (struct linux_rt_sigframe *)(alpha_pal_rdusp());
 133         sfp = (struct linux_rt_sigframe *)((char *)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         memset(&sigframe.uc, 0, 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(&sigframe.uc.uc_mcontext.sc_mask, mask);
 150         native_to_linux_sigset(&sigframe.uc.uc_sigmask, mask);
 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(l, 1);
 158         sigframe.uc.uc_mcontext.sc_fpcr = alpha_read_fpcr();
 159         sigframe.uc.uc_mcontext.sc_fp_control = alpha_read_fp_c(l);
 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         memset(&sigframe.info, 0, 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 = kauth_cred_geteuid(l->l_cred);  /* Use real uid here? */
 177
 178         sendsig_reset(l, sig);
 179         mutex_exit(p->p_lock);
 180         error = copyout((void *)&sigframe, (void *)sfp, fsize);
 181         mutex_enter(p->p_lock);
 182
 183         if (error != 0) {
 184 #ifdef DEBUG
 185                 if ((sigdebug & SDB_KSTACK) && p->p_pid == sigpid)
 186                         printf("sendsig(%d): copyout failed on sig %d\n",
 187                             p->p_pid, sig);
 188 #endif
 189                 /*
 190                  * Process has trashed its stack; give it an illegal
 191                  * instruction to halt it in its tracks.
 192                  */
 193                 sigexit(l, SIGILL);
 194                 /* NOTREACHED */
 195         }
 196
 197         /* Pass pointers to siginfo and ucontext in the regs */
 198         tf->tf_regs[FRAME_A1] = (unsigned long)&sfp->info;
 199         tf->tf_regs[FRAME_A2] = (unsigned long)&sfp->uc;
 200
 201         /* Address of trampoline code.  End up at this PC after mi_switch */
 202         tf->tf_regs[FRAME_PC] =
 203             (u_int64_t)(p->p_psstr - (linux_rt_esigcode - linux_rt_sigcode));
 204
 205         /* Adjust the stack */
 206         alpha_pal_wrusp((unsigned long)sfp);
 207
 208         /* Remember that we're now on the signal stack. */
 209         if (onstack)
 210                 l->l_sigstk.ss_flags |= SS_ONSTACK;
 211 }
 212
 213 void setup_linux_sigframe(tf, sig, mask)
 214         struct trapframe *tf;
 215         int sig;
 216         const sigset_t *mask;
 217 {
 218         struct lwp *l = curlwp;
 219         struct proc *p = l->l_proc;
 220         struct linux_sigframe *sfp, sigframe;
 221         int onstack, error;
 222         int fsize, rndfsize;
 223         extern char linux_sigcode[], linux_esigcode[];
 224
 225         /* Do we need to jump onto the signal stack? */
 226         onstack = (l->l_sigstk.ss_flags & (SS_DISABLE | SS_ONSTACK)) == 0 &&
 227                   (SIGACTION(p, sig).sa_flags & SA_ONSTACK) != 0;
 228
 229         /* Allocate space for the signal handler context.  */
 230         fsize = sizeof(struct linux_sigframe);
 231         rndfsize = ((fsize + 15) / 16) * 16;
 232
 233         if (onstack)
 234                 sfp = (struct linux_sigframe *)
 235                     ((char *)l->l_sigstk.ss_sp + l->l_sigstk.ss_size);
 236         else
 237                 sfp = (struct linux_sigframe *)(alpha_pal_rdusp());
 238         sfp = (struct linux_sigframe *)((char *)sfp - rndfsize);
 239
 240 #ifdef DEBUG
 241         if ((sigdebug & SDB_KSTACK) && (p->p_pid == sigpid))
 242                 printf("linux_sendsig(%d): sig %d ssp %p usp %p\n", p->p_pid,
 243                     sig, &onstack, sfp);
 244 #endif /* DEBUG */
 245
 246         /*
 247          * Build the signal context to be used by sigreturn.
 248          */
 249         memset(&sigframe.sf_sc, 0, sizeof(struct linux_sigcontext));
 250         sigframe.sf_sc.sc_onstack = onstack;
 251         native_to_linux_old_sigset(&sigframe.sf_sc.sc_mask, mask);
 252         sigframe.sf_sc.sc_pc = tf->tf_regs[FRAME_PC];
 253         sigframe.sf_sc.sc_ps = ALPHA_PSL_USERMODE;
 254         frametoreg(tf, (struct reg *)sigframe.sf_sc.sc_regs);
 255         sigframe.sf_sc.sc_regs[R_SP] = alpha_pal_rdusp();
 256
 257         if (l == fpcurlwp) {
 258                 struct pcb *pcb = lwp_getpcb(l);
 259
 260                 alpha_pal_wrfen(1);
 261                 savefpstate(&pcb->pcb_fp);
 262                 alpha_pal_wrfen(0);
 263                 sigframe.sf_sc.sc_fpcr = pcb->pcb_fp.fpr_cr;
 264                 fpcurlwp = NULL;
 265         }
 266         /* XXX ownedfp ? etc...? */
 267
 268         sigframe.sf_sc.sc_traparg_a0 = tf->tf_regs[FRAME_A0];
 269         sigframe.sf_sc.sc_traparg_a1 = tf->tf_regs[FRAME_A1];
 270         sigframe.sf_sc.sc_traparg_a2 = tf->tf_regs[FRAME_A2];
 271
 272         sendsig_reset(l, sig);
 273         mutex_exit(p->p_lock);
 274         error = copyout((void *)&sigframe, (void *)sfp, fsize);
 275         mutex_enter(p->p_lock);
 276
 277         if (error != 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)(p->p_psstr - (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                 l->l_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(const ksiginfo_t *ksi, const sigset_t *mask)
 319 {
 320         struct lwp *l = curlwp;
 321         struct proc *p = l->l_proc;
 322         struct trapframe *tf = l->l_md.md_tf;
 323         const int sig = ksi->ksi_signo;
 324         sig_t catcher = SIGACTION(p, sig).sa_handler;
 325 #ifdef notyet
 326         struct linux_emuldata *edp;
 327
 328         /* Setup the signal frame (and part of the trapframe) */
 329         /*OLD: if (p->p_sigacts->ps_siginfo & sigmask(sig))*/
 330 /*      XXX XAX this is broken now.  need someplace to store what
 331         XXX XAX kind of signal handler a signal has.*/
 332 #if 0
 333         edp = (struct linux_emuldata *)p->p_emuldata;
 334 #else
 335         edp = 0;
 336 #endif
 337         if (edp && sigismember(&edp->ps_siginfo, sig))
 338                 setup_linux_rt_sigframe(tf, sig, mask);
 339         else
 340 #endif /* notyet */
 341                 setup_linux_sigframe(tf, sig, mask);
 342
 343         /* Signal handler for trampoline code */
 344         tf->tf_regs[FRAME_T12] = (u_int64_t)catcher;
 345         tf->tf_regs[FRAME_A0] = native_to_linux_signo[sig];
 346
 347         /*
 348          * Linux has a custom restorer option.  To support it we would
 349          * need to store an array of restorers and a sigcode block
 350          * which knew to use it.  Doesn't seem worth the trouble.
 351          * -erh
 352          */
 353
 354 #ifdef DEBUG
 355         if (sigdebug & SDB_FOLLOW)
 356                 printf("sendsig(%d): pc %lx, catcher %lx\n", l->l_proc->p_pid,
 357                     tf->tf_regs[FRAME_PC], tf->tf_regs[FRAME_A3]);
 358         if ((sigdebug & SDB_KSTACK) && l->l_proc->p_pid == sigpid)
 359                 printf("sendsig(%d): sig %d returns\n", l->l_proc->p_pid, sig);
 360 #endif
 361 }
 362
 363 /*
 364  * System call to cleanup state after a signal
 365  * has been taken.  Reset signal mask and
 366  * stack state from context left by sendsig (above).
 367  * Return to previous pc as specified by context
 368  * left by sendsig.
 369  * Linux real-time signals use a different sigframe,
 370  * but the sigcontext is the same.
 371  */
 372
 373 int
 374 linux_restore_sigcontext(struct lwp *l, struct linux_sigcontext context,
 375                          sigset_t *mask)
 376 {
 377         struct proc *p = l->l_proc;
 378         struct pcb *pcb;
 379
 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         mutex_enter(p->p_lock);
 386         if (context.sc_onstack & LINUX_SA_ONSTACK)
 387             l->l_sigstk.ss_flags |= SS_ONSTACK;
 388         else
 389             l->l_sigstk.ss_flags &= ~SS_ONSTACK;
 390
 391         /* Reset the signal mask */
 392         (void) sigprocmask1(l, SIG_SETMASK, mask, 0);
 393         mutex_exit(p->p_lock);
 394
 395         /*
 396          * Check for security violations.
 397          * Linux doesn't allow any changes to the PSL.
 398          */
 399         if (context.sc_ps != ALPHA_PSL_USERMODE)
 400             return(EINVAL);
 401
 402         l->l_md.md_tf->tf_regs[FRAME_PC] = context.sc_pc;
 403         l->l_md.md_tf->tf_regs[FRAME_PS] = context.sc_ps;
 404
 405         regtoframe((struct reg *)context.sc_regs, l->l_md.md_tf);
 406         alpha_pal_wrusp(context.sc_regs[R_SP]);
 407
 408         if (l == fpcurlwp)
 409             fpcurlwp = NULL;
 410
 411         /* Restore fp regs and fpr_cr */
 412         pcb = lwp_getpcb(l);
 413         memcpy(&pcb->pcb_fp, (struct fpreg *)context.sc_fpregs,
 414             sizeof(struct fpreg));
 415         /* XXX sc_ownedfp ? */
 416         /* XXX sc_fp_control ? */
 417
 418 #ifdef DEBUG
 419         if (sigdebug & SDB_FOLLOW)
 420                 printf("linux_rt_sigreturn(%d): returns\n", p->p_pid);
 421 #endif
 422         return (EJUSTRETURN);
 423 }
 424
 425 int
 426 linux_sys_rt_sigreturn(struct lwp *l, const struct linux_sys_rt_sigreturn_args *uap, register_t *retval)
 427 {
 428         /* {
 429                 syscallarg(struct linux_rt_sigframe *) sfp;
 430         } */
 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((void *)sfp, &sigframe,
 449                         sizeof(struct linux_rt_sigframe)) != 0)
 450                 return (EFAULT);
 451
 452         /* Grab the signal mask */
 453         linux_to_native_sigset(&mask, &sigframe.uc.uc_sigmask);
 454
 455         return(linux_restore_sigcontext(l, sigframe.uc.uc_mcontext, &mask));
 456 }
 457
 458
 459 int
 460 linux_sys_sigreturn(struct lwp *l, const struct linux_sys_sigreturn_args *uap, register_t *retval)
 461 {
 462         /* {
 463                 syscallarg(struct linux_sigframe *) sfp;
 464         } */
 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((void *)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(&mask, frame.sf_sc.sc_mask);
 487
 488         return(linux_restore_sigcontext(l, 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(struct lwp *l, const struct linux_sys_ioctl_args *uap, register_t *retval)
 497 {
 498         /* {
 499                 syscallarg(int) fd;
 500                 syscallarg(u_long) com;
 501                 syscallarg(void *) data;
 502         } */
 503         struct sys_ioctl_args bia;
 504         u_long com;
 505
 506         SCARG(&bia, fd) = SCARG(uap, fd);
 507         SCARG(&bia, data) = SCARG(uap, data);
 508         com = SCARG(uap, com);
 509
 510         switch (com) {
 511         default:
 512                 printf("linux_machdepioctl: invalid ioctl %08lx\n", com);
 513                 return EINVAL;
 514         }
 515         SCARG(&bia, com) = com;
 516         return sys_ioctl(l, &bia, retval);
 517 }
 518
 519 /* XXX XAX fix this */
 520 dev_t
 521 linux_fakedev(dev_t dev, int raw)
 522 {
 523         return dev;
 524 }
 525
 526 int
 527 linux_usertrap(struct lwp *l, vaddr_t trapaddr, void *arg)
 528 {
 529         return 0;
 530 }