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linux_machdep.c revision 1.46.14.2
      1  1.46.14.2  jdolecek /*	$NetBSD: linux_machdep.c,v 1.46.14.2 2017/12/03 11:36:54 jdolecek Exp $ */
      2        1.1      manu 
      3        1.1      manu /*-
      4        1.1      manu  * Copyright (c) 1995, 2000, 2001 The NetBSD Foundation, Inc.
      5        1.1      manu  * All rights reserved.
      6        1.1      manu  *
      7        1.1      manu  * This code is derived from software contributed to The NetBSD Foundation
      8        1.1      manu  * by Frank van der Linden and Emmanuel Dreyfus.
      9        1.1      manu  *
     10        1.1      manu  * Redistribution and use in source and binary forms, with or without
     11        1.1      manu  * modification, are permitted provided that the following conditions
     12        1.1      manu  * are met:
     13        1.1      manu  * 1. Redistributions of source code must retain the above copyright
     14        1.1      manu  *    notice, this list of conditions and the following disclaimer.
     15        1.1      manu  * 2. Redistributions in binary form must reproduce the above copyright
     16        1.1      manu  *    notice, this list of conditions and the following disclaimer in the
     17        1.1      manu  *    documentation and/or other materials provided with the distribution.
     18        1.1      manu  *
     19        1.1      manu  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     20        1.1      manu  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     21        1.1      manu  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     22        1.1      manu  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     23        1.1      manu  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     24        1.1      manu  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     25        1.1      manu  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     26        1.1      manu  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     27        1.1      manu  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     28        1.1      manu  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     29        1.1      manu  * POSSIBILITY OF SUCH DAMAGE.
     30        1.1      manu  */
     31       1.12     lukem 
     32       1.12     lukem #include <sys/cdefs.h>
     33  1.46.14.2  jdolecek __KERNEL_RCSID(0, "$NetBSD: linux_machdep.c,v 1.46.14.2 2017/12/03 11:36:54 jdolecek Exp $");
     34        1.1      manu 
     35        1.1      manu #include <sys/param.h>
     36        1.1      manu #include <sys/systm.h>
     37        1.1      manu #include <sys/signalvar.h>
     38        1.1      manu #include <sys/kernel.h>
     39        1.1      manu #include <sys/proc.h>
     40        1.1      manu #include <sys/buf.h>
     41        1.1      manu #include <sys/reboot.h>
     42        1.1      manu #include <sys/conf.h>
     43        1.1      manu #include <sys/exec.h>
     44        1.1      manu #include <sys/file.h>
     45        1.1      manu #include <sys/callout.h>
     46        1.1      manu #include <sys/mbuf.h>
     47        1.1      manu #include <sys/msgbuf.h>
     48        1.1      manu #include <sys/mount.h>
     49        1.1      manu #include <sys/vnode.h>
     50        1.1      manu #include <sys/device.h>
     51        1.1      manu #include <sys/syscallargs.h>
     52        1.1      manu #include <sys/filedesc.h>
     53        1.1      manu #include <sys/exec_elf.h>
     54        1.1      manu #include <sys/disklabel.h>
     55        1.3      manu #include <sys/ioctl.h>
     56        1.1      manu #include <miscfs/specfs/specdev.h>
     57        1.1      manu 
     58        1.1      manu #include <compat/linux/common/linux_types.h>
     59        1.1      manu #include <compat/linux/common/linux_signal.h>
     60        1.1      manu #include <compat/linux/common/linux_util.h>
     61        1.1      manu #include <compat/linux/common/linux_ioctl.h>
     62        1.1      manu #include <compat/linux/common/linux_hdio.h>
     63        1.1      manu #include <compat/linux/common/linux_exec.h>
     64        1.1      manu #include <compat/linux/common/linux_machdep.h>
     65        1.1      manu 
     66        1.1      manu #include <compat/linux/linux_syscallargs.h>
     67        1.1      manu 
     68       1.35        ad #include <sys/cpu.h>
     69       1.11       wiz #include <machine/fpu.h>
     70        1.1      manu #include <machine/psl.h>
     71       1.43     rmind #include <machine/pcb.h>
     72        1.1      manu #include <machine/vmparam.h>
     73        1.1      manu 
     74        1.1      manu /*
     75        1.1      manu  * To see whether wscons is configured (for virtual console ioctl calls).
     76        1.1      manu  */
     77       1.10       mrg #if defined(_KERNEL_OPT)
     78        1.1      manu #include "wsdisplay.h"
     79        1.1      manu #endif
     80        1.1      manu #if (NWSDISPLAY > 0)
     81        1.1      manu #include <dev/wscons/wsconsio.h>
     82        1.1      manu #include <dev/wscons/wsdisplay_usl_io.h>
     83        1.1      manu #endif
     84        1.1      manu 
     85       1.29     perry /*
     86        1.1      manu  * Set set up registers on exec.
     87        1.1      manu  */
     88        1.1      manu void
     89       1.42       chs linux_setregs(struct lwp *l, struct exec_package *pack, vaddr_t stack)
     90       1.29     perry {
     91       1.20   thorpej 	setregs(l, pack, stack);
     92        1.1      manu }
     93        1.1      manu 
     94        1.1      manu /*
     95        1.1      manu  * Send an interrupt to process.
     96        1.1      manu  *
     97        1.1      manu  * Adapted from arch/powerpc/powerpc/sig_machdep.c:sendsig and
     98        1.1      manu  * compat/linux/arch/i386/linux_machdep.c:linux_sendsig
     99        1.1      manu  *
    100        1.6      manu  * XXX Does not work well yet with RT signals
    101        1.1      manu  *
    102        1.1      manu  */
    103        1.1      manu 
    104       1.23      matt void
    105       1.24  christos linux_sendsig(const ksiginfo_t *ksi, const sigset_t *mask)
    106        1.1      manu {
    107       1.26   thorpej 	const int sig = ksi->ksi_signo;
    108       1.20   thorpej 	struct lwp *l = curlwp;
    109       1.20   thorpej 	struct proc *p = l->l_proc;
    110        1.1      manu 	struct trapframe *tf;
    111       1.16   thorpej 	sig_t catcher = SIGACTION(p, sig).sa_handler;
    112        1.8      manu 	struct linux_sigregs frame;
    113        1.4  christos 	struct linux_pt_regs linux_regs;
    114        1.1      manu 	struct linux_sigcontext sc;
    115        1.8      manu 	register_t fp;
    116       1.32        ad 	int onstack, error;
    117        1.1      manu 	int i;
    118        1.1      manu 
    119       1.20   thorpej 	tf = trapframe(l);
    120       1.29     perry 
    121       1.29     perry 	/*
    122       1.29     perry 	 * Do we need to jump onto the signal stack?
    123        1.1      manu 	 */
    124        1.1      manu 	onstack =
    125       1.32        ad 	    (l->l_sigstk.ss_flags & (SS_DISABLE | SS_ONSTACK)) == 0 &&
    126        1.1      manu 	    (SIGACTION(p, sig).sa_flags & SA_ONSTACK) != 0;
    127        1.1      manu 
    128        1.1      manu 	/*
    129        1.1      manu 	 * Signal stack is broken (see at the end of linux_sigreturn), so we do
    130        1.1      manu 	 * not use it yet. XXX fix this.
    131        1.1      manu 	 */
    132        1.1      manu 	onstack=0;
    133        1.1      manu 
    134       1.29     perry 	/*
    135       1.29     perry 	 * Allocate space for the signal handler context.
    136        1.1      manu 	 */
    137        1.4  christos 	if (onstack) {
    138        1.8      manu 		fp = (register_t)
    139       1.34   tsutsui 		    ((char *)l->l_sigstk.ss_sp +
    140       1.32        ad 		    l->l_sigstk.ss_size);
    141        1.4  christos 	} else {
    142       1.44      matt 		fp = tf->tf_fixreg[1];
    143        1.4  christos 	}
    144        1.8      manu #ifdef DEBUG_LINUX
    145        1.8      manu 	printf("fp at start of linux_sendsig = %x\n", fp);
    146        1.8      manu #endif
    147        1.8      manu 	fp -= sizeof(struct linux_sigregs);
    148        1.8      manu 	fp &= ~0xf;
    149        1.1      manu 
    150       1.29     perry 	/*
    151        1.1      manu 	 * Prepare a sigcontext for later.
    152        1.1      manu 	 */
    153        1.8      manu 	memset(&sc, 0, sizeof sc);
    154       1.14  christos 	sc.lsignal = (int)native_to_linux_signo[sig];
    155        1.1      manu 	sc.lhandler = (unsigned long)catcher;
    156       1.13  christos 	native_to_linux_old_extra_sigset(&sc.lmask, &sc._unused[3], mask);
    157        1.1      manu 	sc.lregs = (struct linux_pt_regs*)fp;
    158        1.1      manu 
    159        1.1      manu 	/*
    160       1.29     perry 	 * Setup the signal stack frame as Linux does it in
    161        1.1      manu 	 * arch/ppc/kernel/signal.c:setup_frame()
    162        1.1      manu 	 *
    163       1.29     perry 	 * Save register context.
    164        1.1      manu 	 */
    165       1.29     perry 	for (i = 0; i < 32; i++)
    166       1.44      matt 		linux_regs.lgpr[i] = tf->tf_fixreg[i];
    167       1.44      matt 	linux_regs.lnip = tf->tf_srr0;
    168       1.44      matt 	linux_regs.lmsr = tf->tf_srr1 & PSL_USERSRR1;
    169       1.44      matt 	linux_regs.lorig_gpr3 = tf->tf_fixreg[3]; /* XXX Is that right? */
    170       1.44      matt 	linux_regs.lctr = tf->tf_ctr;
    171       1.44      matt 	linux_regs.llink = tf->tf_lr;
    172       1.44      matt 	linux_regs.lxer = tf->tf_xer;
    173       1.44      matt 	linux_regs.lccr = tf->tf_cr;
    174        1.1      manu 	linux_regs.lmq = 0;  			/* Unused, 601 only */
    175       1.44      matt 	linux_regs.ltrap = tf->tf_exc;
    176       1.44      matt 	linux_regs.ldar = tf->tf_dar;
    177       1.44      matt 	linux_regs.ldsisr = tf->tf_dsisr;
    178        1.8      manu 	linux_regs.lresult = 0;
    179        1.8      manu 
    180        1.8      manu 	memset(&frame, 0, sizeof(frame));
    181        1.8      manu 	memcpy(&frame.lgp_regs, &linux_regs, sizeof(linux_regs));
    182        1.1      manu 
    183       1.46      matt #ifdef PPC_HAVE_FPU
    184  1.46.14.2  jdolecek 	fpu_save(l);
    185       1.46      matt #endif
    186       1.28      matt 	memcpy(&frame.lfp_regs, curpcb->pcb_fpu.fpreg, sizeof(frame.lfp_regs));
    187        1.1      manu 
    188        1.1      manu 	/*
    189        1.4  christos 	 * Copy Linux's signal trampoline on the user stack It should not
    190        1.6      manu 	 * be used, but Linux binaries might expect it to be there.
    191        1.1      manu 	 */
    192        1.4  christos 	frame.ltramp[0] = 0x38997777; /* li r0, 0x7777 */
    193        1.4  christos 	frame.ltramp[1] = 0x44000002; /* sc */
    194       1.29     perry 
    195        1.1      manu 	/*
    196        1.1      manu 	 * Move it to the user stack
    197       1.29     perry 	 * There is a little trick here, about the LINUX_ABIGAP: the
    198        1.1      manu 	 * linux_sigreg structure has a 56 int gap to support rs6000/xcoff
    199        1.1      manu 	 * binaries. But the Linux kernel seems to do without it, and it
    200        1.1      manu 	 * just skip it when building the stack frame. Hence the LINUX_ABIGAP.
    201        1.1      manu 	 */
    202       1.32        ad 	sendsig_reset(l, sig);
    203       1.38        ad 	mutex_exit(p->p_lock);
    204       1.33  christos 	error = copyout(&frame, (void *)fp, sizeof (frame) - LINUX_ABIGAP);
    205       1.32        ad 
    206       1.32        ad 	if (error != 0) {
    207        1.1      manu 		/*
    208        1.1      manu 		 * Process has trashed its stack; give it an illegal
    209        1.9      manu 		 * instruction to halt it in its tracks.
    210        1.1      manu 		 */
    211       1.38        ad 		mutex_enter(p->p_lock);
    212       1.20   thorpej 		sigexit(l, SIGILL);
    213        1.1      manu 		/* NOTREACHED */
    214        1.1      manu 	}
    215        1.1      manu 
    216        1.1      manu 	/*
    217        1.1      manu 	 * Add a sigcontext on the stack
    218        1.1      manu 	 */
    219        1.8      manu 	fp -= sizeof(struct linux_sigcontext);
    220       1.33  christos 	error = copyout(&sc, (void *)fp, sizeof (struct linux_sigcontext));
    221       1.38        ad 	mutex_enter(p->p_lock);
    222       1.32        ad 
    223       1.32        ad 	if (error != 0) {
    224        1.1      manu 		/*
    225        1.1      manu 		 * Process has trashed its stack; give it an illegal
    226        1.9      manu 		 * instruction to halt it in its tracks.
    227        1.1      manu 		 */
    228       1.20   thorpej 		sigexit(l, SIGILL);
    229        1.1      manu 		/* NOTREACHED */
    230        1.1      manu 	}
    231        1.1      manu 
    232        1.1      manu 	/*
    233        1.8      manu 	 * Set the registers according to how the Linux process expects them.
    234        1.8      manu 	 * "Mind the gap" Linux expects a gap here.
    235        1.1      manu 	 */
    236       1.44      matt 	tf->tf_fixreg[1] = fp - LINUX__SIGNAL_FRAMESIZE;
    237       1.44      matt 	tf->tf_lr = (int)catcher;
    238       1.44      matt 	tf->tf_fixreg[3] = (int)native_to_linux_signo[sig];
    239       1.44      matt 	tf->tf_fixreg[4] = fp;
    240       1.44      matt 	tf->tf_srr0 = (int)p->p_sigctx.ps_sigcode;
    241        1.1      manu 
    242        1.8      manu #ifdef DEBUG_LINUX
    243        1.8      manu 	printf("fp at end of linux_sendsig = %x\n", fp);
    244        1.8      manu #endif
    245       1.29     perry 	/*
    246       1.29     perry 	 * Remember that we're now on the signal stack.
    247        1.1      manu 	 */
    248        1.1      manu 	if (onstack)
    249       1.32        ad 		l->l_sigstk.ss_flags |= SS_ONSTACK;
    250        1.1      manu #ifdef DEBUG_LINUX
    251  1.46.14.1       tls 	printf("linux_sendsig: exiting. fp=0x%lx\n",(long)fp);
    252        1.1      manu #endif
    253        1.1      manu }
    254        1.1      manu 
    255        1.1      manu /*
    256        1.1      manu  * System call to cleanup state after a signal
    257        1.1      manu  * has been taken.  Reset signal mask and
    258        1.1      manu  * stack state from context left by sendsig (above).
    259        1.1      manu  * Return to previous pc and psl as specified by
    260        1.1      manu  * context left by sendsig. Check carefully to
    261        1.1      manu  * make sure that the user has not modified the
    262        1.1      manu  * psl to gain improper privileges or to cause
    263        1.1      manu  * a machine fault.
    264        1.1      manu  *
    265        1.1      manu  * XXX not tested
    266        1.1      manu  */
    267        1.1      manu int
    268       1.37       dsl linux_sys_rt_sigreturn(struct lwp *l, const struct linux_sys_rt_sigreturn_args *uap, register_t *retval)
    269        1.1      manu {
    270       1.37       dsl 	/* {
    271        1.1      manu 		syscallarg(struct linux_rt_sigframe *) sfp;
    272       1.37       dsl 	} */
    273       1.20   thorpej 	struct proc *p = l->l_proc;
    274        1.1      manu 	struct linux_rt_sigframe *scp, sigframe;
    275        1.8      manu 	struct linux_sigregs sregs;
    276        1.8      manu 	struct linux_pt_regs *lregs;
    277        1.1      manu 	struct trapframe *tf;
    278        1.1      manu 	sigset_t mask;
    279        1.1      manu 	int i;
    280        1.1      manu 
    281        1.1      manu 	/*
    282        1.1      manu 	 * The trampoline code hands us the context.
    283        1.1      manu 	 * It is unsafe to keep track of it ourselves, in the event that a
    284        1.1      manu 	 * program jumps out of a signal handler.
    285        1.1      manu 	 */
    286        1.1      manu 	scp = SCARG(uap, sfp);
    287        1.1      manu 
    288        1.1      manu 	/*
    289        1.1      manu 	 * Get the context from user stack
    290        1.1      manu 	 */
    291       1.33  christos 	if (copyin((void *)scp, &sigframe, sizeof(*scp)))
    292        1.1      manu 		return (EFAULT);
    293        1.1      manu 
    294        1.1      manu 	/*
    295        1.8      manu 	 *  Restore register context.
    296        1.1      manu 	 */
    297       1.33  christos 	if (copyin((void *)sigframe.luc.luc_context.lregs,
    298        1.8      manu 		   &sregs, sizeof(sregs)))
    299        1.8      manu 		return (EFAULT);
    300        1.8      manu 	lregs = (struct linux_pt_regs *)&sregs.lgp_regs;
    301        1.8      manu 
    302       1.20   thorpej 	tf = trapframe(l);
    303        1.1      manu #ifdef DEBUG_LINUX
    304       1.41       wiz 	printf("linux_sys_rt_sigreturn: trapframe=0x%lx scp=0x%lx\n",
    305        1.1      manu 	    (unsigned long)tf, (unsigned long)scp);
    306        1.1      manu #endif
    307        1.1      manu 
    308       1.28      matt 	if (!PSL_USEROK_P(lregs->lmsr))
    309       1.29     perry 		return (EINVAL);
    310        1.1      manu 
    311       1.29     perry 	for (i = 0; i < 32; i++)
    312       1.44      matt 		tf->tf_fixreg[i] = lregs->lgpr[i];
    313       1.44      matt 	tf->tf_lr = lregs->llink;
    314       1.44      matt 	tf->tf_cr = lregs->lccr;
    315       1.44      matt 	tf->tf_xer = lregs->lxer;
    316       1.44      matt 	tf->tf_ctr = lregs->lctr;
    317       1.44      matt 	tf->tf_srr0 = lregs->lnip;
    318       1.44      matt 	tf->tf_srr1 = lregs->lmsr;
    319        1.8      manu 
    320       1.28      matt 	/*
    321       1.28      matt 	 * Make sure the fpu state is discarded
    322       1.28      matt 	 */
    323       1.46      matt #ifdef PPC_HAVE_FPU
    324  1.46.14.2  jdolecek 	fpu_discard(l);
    325       1.46      matt #endif
    326       1.28      matt 
    327       1.33  christos 	memcpy(curpcb->pcb_fpu.fpreg, (void *)&sregs.lfp_regs,
    328       1.28      matt 	       sizeof(curpcb->pcb_fpu.fpreg));
    329        1.1      manu 
    330  1.46.14.2  jdolecek 	fpu_mark_used(l);
    331       1.46      matt 
    332       1.38        ad 	mutex_enter(p->p_lock);
    333       1.32        ad 
    334       1.29     perry 	/*
    335       1.29     perry 	 * Restore signal stack.
    336       1.29     perry 	 *
    337       1.29     perry 	 * XXX cannot find the onstack information in Linux sig context.
    338        1.1      manu 	 * Is signal stack really supported on Linux?
    339       1.29     perry 	 *
    340        1.1      manu 	 * It seems to be supported in libc6...
    341        1.1      manu 	 */
    342       1.29     perry 	/* if (sc.sc_onstack & SS_ONSTACK)
    343       1.32        ad 		l->l_sigstk.ss_flags |= SS_ONSTACK;
    344        1.1      manu 	else */
    345       1.32        ad 		l->l_sigstk.ss_flags &= ~SS_ONSTACK;
    346        1.1      manu 
    347        1.8      manu 	/*
    348        1.8      manu 	 * Grab the signal mask
    349        1.8      manu 	 */
    350       1.13  christos 	linux_to_native_sigset(&mask, &sigframe.luc.luc_sigmask);
    351       1.32        ad 	(void) sigprocmask1(l, SIG_SETMASK, &mask, 0);
    352       1.32        ad 
    353       1.38        ad 	mutex_exit(p->p_lock);
    354        1.8      manu 
    355        1.1      manu 	return (EJUSTRETURN);
    356        1.1      manu }
    357        1.1      manu 
    358        1.1      manu 
    359        1.1      manu /*
    360        1.1      manu  * The following needs code review for potential security issues
    361        1.1      manu  */
    362        1.1      manu int
    363       1.37       dsl linux_sys_sigreturn(struct lwp *l, const struct linux_sys_sigreturn_args *uap, register_t *retval)
    364        1.1      manu {
    365       1.37       dsl 	/* {
    366        1.1      manu 		syscallarg(struct linux_sigcontext *) scp;
    367       1.37       dsl 	} */
    368       1.20   thorpej 	struct proc *p = l->l_proc;
    369        1.1      manu 	struct linux_sigcontext *scp, context;
    370        1.8      manu 	struct linux_sigregs sregs;
    371        1.8      manu 	struct linux_pt_regs *lregs;
    372        1.1      manu 	struct trapframe *tf;
    373        1.1      manu 	sigset_t mask;
    374        1.1      manu 	int i;
    375        1.1      manu 
    376        1.1      manu 	/*
    377        1.1      manu 	 * The trampoline code hands us the context.
    378        1.1      manu 	 * It is unsafe to keep track of it ourselves, in the event that a
    379        1.1      manu 	 * program jumps out of a signal handler.
    380        1.1      manu 	 */
    381        1.1      manu 	scp = SCARG(uap, scp);
    382        1.1      manu 
    383        1.1      manu 	/*
    384        1.8      manu 	 * Get the context from user stack
    385        1.1      manu 	 */
    386        1.8      manu 	if (copyin(scp, &context, sizeof(*scp)))
    387        1.8      manu 		return (EFAULT);
    388        1.1      manu 
    389        1.1      manu 	/*
    390        1.8      manu 	 *  Restore register context.
    391        1.1      manu 	 */
    392       1.33  christos 	if (copyin((void *)context.lregs, &sregs, sizeof(sregs)))
    393        1.8      manu 		return (EFAULT);
    394        1.8      manu 	lregs = (struct linux_pt_regs *)&sregs.lgp_regs;
    395        1.8      manu 
    396       1.20   thorpej 	tf = trapframe(l);
    397        1.1      manu #ifdef DEBUG_LINUX
    398        1.1      manu 	printf("linux_sys_sigreturn: trapframe=0x%lx scp=0x%lx\n",
    399        1.1      manu 	    (unsigned long)tf, (unsigned long)scp);
    400        1.1      manu #endif
    401        1.1      manu 
    402       1.28      matt 	if (!PSL_USEROK_P(lregs->lmsr))
    403       1.29     perry 		return (EINVAL);
    404        1.1      manu 
    405       1.29     perry 	for (i = 0; i < 32; i++)
    406       1.44      matt 		tf->tf_fixreg[i] = lregs->lgpr[i];
    407       1.44      matt 	tf->tf_lr = lregs->llink;
    408       1.44      matt 	tf->tf_cr = lregs->lccr;
    409       1.44      matt 	tf->tf_xer = lregs->lxer;
    410       1.44      matt 	tf->tf_ctr = lregs->lctr;
    411       1.44      matt 	tf->tf_srr0 = lregs->lnip;
    412       1.44      matt 	tf->tf_srr1 = lregs->lmsr;
    413        1.8      manu 
    414       1.28      matt 	/*
    415       1.28      matt 	 * Make sure the fpu state is discarded
    416       1.28      matt 	 */
    417       1.46      matt #ifdef PPC_HAVE_FPU
    418  1.46.14.2  jdolecek 	fpu_discard(l);
    419       1.46      matt #endif
    420       1.28      matt 
    421       1.33  christos 	memcpy(curpcb->pcb_fpu.fpreg, (void *)&sregs.lfp_regs,
    422       1.28      matt 	       sizeof(curpcb->pcb_fpu.fpreg));
    423        1.1      manu 
    424  1.46.14.2  jdolecek 	fpu_mark_used(l);
    425       1.46      matt 
    426       1.38        ad 	mutex_enter(p->p_lock);
    427       1.32        ad 
    428       1.29     perry 	/*
    429       1.29     perry 	 * Restore signal stack.
    430       1.29     perry 	 *
    431       1.29     perry 	 * XXX cannot find the onstack information in Linux sig context.
    432        1.1      manu 	 * Is signal stack really supported on Linux?
    433        1.1      manu 	 */
    434        1.4  christos #if 0
    435       1.29     perry 	if (sc.sc_onstack & SS_ONSTACK)
    436       1.32        ad 		l->l_sigstk.ss_flags |= SS_ONSTACK;
    437        1.4  christos 	else
    438        1.4  christos #endif
    439       1.32        ad 		l->l_sigstk.ss_flags &= ~SS_ONSTACK;
    440        1.1      manu 
    441        1.1      manu 	/* Restore signal mask. */
    442       1.13  christos 	linux_old_extra_to_native_sigset(&mask, &context.lmask,
    443       1.13  christos 	    &context._unused[3]);
    444       1.32        ad 	(void) sigprocmask1(l, SIG_SETMASK, &mask, 0);
    445       1.32        ad 
    446       1.38        ad 	mutex_exit(p->p_lock);
    447        1.1      manu 
    448        1.1      manu 	return (EJUSTRETURN);
    449        1.1      manu }
    450        1.1      manu 
    451       1.29     perry /*
    452        1.6      manu  * major device numbers remapping
    453        1.6      manu  */
    454        1.1      manu dev_t
    455       1.36       dsl linux_fakedev(dev_t dev, int raw)
    456        1.1      manu {
    457       1.15  jdolecek 	/* XXX write me */
    458       1.15  jdolecek 	return dev;
    459        1.1      manu }
    460        1.1      manu 
    461        1.1      manu /*
    462        1.1      manu  * We come here in a last attempt to satisfy a Linux ioctl() call
    463        1.1      manu  */
    464        1.1      manu int
    465       1.37       dsl linux_machdepioctl(struct lwp *l, const struct linux_sys_ioctl_args *uap, register_t *retval)
    466       1.29     perry {
    467       1.37       dsl 	/* {
    468        1.1      manu 		syscallarg(int) fd;
    469        1.1      manu 		syscallarg(u_long) com;
    470       1.33  christos 		syscallarg(void *) data;
    471       1.37       dsl 	} */
    472        1.1      manu 	struct sys_ioctl_args bia;
    473        1.1      manu 	u_long com;
    474       1.29     perry 
    475        1.1      manu 	SCARG(&bia, fd) = SCARG(uap, fd);
    476        1.1      manu 	SCARG(&bia, data) = SCARG(uap, data);
    477        1.1      manu 	com = SCARG(uap, com);
    478       1.29     perry 
    479        1.1      manu 	switch (com) {
    480        1.1      manu 	default:
    481        1.1      manu 		printf("linux_machdepioctl: invalid ioctl %08lx\n", com);
    482        1.1      manu 		return EINVAL;
    483        1.1      manu 	}
    484        1.1      manu 	SCARG(&bia, com) = com;
    485       1.20   thorpej 	/* XXX NJWLWP */
    486       1.22      fvdl 	return sys_ioctl(curlwp, &bia, retval);
    487        1.1      manu }
    488        1.1      manu 
    489        1.1      manu /*
    490       1.29     perry  * wrapper linux_sys_new_uname() -> linux_sys_uname()
    491        1.1      manu  */
    492       1.29     perry int
    493       1.37       dsl linux_sys_new_uname(struct lwp *l, const struct linux_sys_new_uname_args *uap, register_t *retval)
    494        1.1      manu {
    495       1.37       dsl 	return linux_sys_uname(l, (const void *)uap, retval);
    496        1.1      manu }
    497        1.1      manu 
    498        1.1      manu /*
    499       1.29     perry  * wrapper linux_sys_new_select() -> linux_sys_select()
    500        1.1      manu  */
    501       1.29     perry int
    502       1.37       dsl linux_sys_new_select(struct lwp *l, const struct linux_sys_new_select_args *uap, register_t *retval)
    503        1.1      manu {
    504       1.37       dsl 	return linux_sys_select(l, (const void *)uap, retval);
    505        1.1      manu }
    506       1.30      fvdl 
    507       1.30      fvdl int
    508       1.30      fvdl linux_usertrap(struct lwp *l, vaddr_t trapaddr, void *arg)
    509       1.30      fvdl {
    510       1.30      fvdl 	return 0;
    511       1.30      fvdl }
    512