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linux_machdep.c revision 1.5.2.2
      1  1.5.2.2  bouyer /*	$NetBSD: linux_machdep.c,v 1.5.2.2 2001/02/11 19:13:51 bouyer Exp $ */
      2  1.5.2.2  bouyer 
      3  1.5.2.2  bouyer /*-
      4  1.5.2.2  bouyer  * Copyright (c) 1995, 2000, 2001 The NetBSD Foundation, Inc.
      5  1.5.2.2  bouyer  * All rights reserved.
      6  1.5.2.2  bouyer  *
      7  1.5.2.2  bouyer  * This code is derived from software contributed to The NetBSD Foundation
      8  1.5.2.2  bouyer  * by Frank van der Linden and Emmanuel Dreyfus.
      9  1.5.2.2  bouyer  *
     10  1.5.2.2  bouyer  * Redistribution and use in source and binary forms, with or without
     11  1.5.2.2  bouyer  * modification, are permitted provided that the following conditions
     12  1.5.2.2  bouyer  * are met:
     13  1.5.2.2  bouyer  * 1. Redistributions of source code must retain the above copyright
     14  1.5.2.2  bouyer  *    notice, this list of conditions and the following disclaimer.
     15  1.5.2.2  bouyer  * 2. Redistributions in binary form must reproduce the above copyright
     16  1.5.2.2  bouyer  *    notice, this list of conditions and the following disclaimer in the
     17  1.5.2.2  bouyer  *    documentation and/or other materials provided with the distribution.
     18  1.5.2.2  bouyer  * 3. All advertising materials mentioning features or use of this software
     19  1.5.2.2  bouyer  *    must display the following acknowledgement:
     20  1.5.2.2  bouyer  *	This product includes software developed by the NetBSD
     21  1.5.2.2  bouyer  *	Foundation, Inc. and its contributors.
     22  1.5.2.2  bouyer  * 4. Neither the name of The NetBSD Foundation nor the names of its
     23  1.5.2.2  bouyer  *    contributors may be used to endorse or promote products derived
     24  1.5.2.2  bouyer  *    from this software without specific prior written permission.
     25  1.5.2.2  bouyer  *
     26  1.5.2.2  bouyer  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     27  1.5.2.2  bouyer  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     28  1.5.2.2  bouyer  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     29  1.5.2.2  bouyer  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     30  1.5.2.2  bouyer  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     31  1.5.2.2  bouyer  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     32  1.5.2.2  bouyer  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     33  1.5.2.2  bouyer  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     34  1.5.2.2  bouyer  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     35  1.5.2.2  bouyer  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     36  1.5.2.2  bouyer  * POSSIBILITY OF SUCH DAMAGE.
     37  1.5.2.2  bouyer  */
     38  1.5.2.2  bouyer 
     39  1.5.2.2  bouyer #include <sys/param.h>
     40  1.5.2.2  bouyer #include <sys/systm.h>
     41  1.5.2.2  bouyer #include <sys/signalvar.h>
     42  1.5.2.2  bouyer #include <sys/kernel.h>
     43  1.5.2.2  bouyer #include <sys/map.h>
     44  1.5.2.2  bouyer #include <sys/proc.h>
     45  1.5.2.2  bouyer #include <sys/user.h>
     46  1.5.2.2  bouyer #include <sys/buf.h>
     47  1.5.2.2  bouyer #include <sys/reboot.h>
     48  1.5.2.2  bouyer #include <sys/conf.h>
     49  1.5.2.2  bouyer #include <sys/exec.h>
     50  1.5.2.2  bouyer #include <sys/file.h>
     51  1.5.2.2  bouyer #include <sys/callout.h>
     52  1.5.2.2  bouyer #include <sys/malloc.h>
     53  1.5.2.2  bouyer #include <sys/mbuf.h>
     54  1.5.2.2  bouyer #include <sys/msgbuf.h>
     55  1.5.2.2  bouyer #include <sys/mount.h>
     56  1.5.2.2  bouyer #include <sys/vnode.h>
     57  1.5.2.2  bouyer #include <sys/device.h>
     58  1.5.2.2  bouyer #include <sys/syscallargs.h>
     59  1.5.2.2  bouyer #include <sys/filedesc.h>
     60  1.5.2.2  bouyer #include <sys/exec_elf.h>
     61  1.5.2.2  bouyer #include <sys/disklabel.h>
     62  1.5.2.2  bouyer #include <sys/ioctl.h>
     63  1.5.2.2  bouyer #include <miscfs/specfs/specdev.h>
     64  1.5.2.2  bouyer 
     65  1.5.2.2  bouyer #include <compat/linux/common/linux_types.h>
     66  1.5.2.2  bouyer #include <compat/linux/common/linux_signal.h>
     67  1.5.2.2  bouyer #include <compat/linux/common/linux_util.h>
     68  1.5.2.2  bouyer #include <compat/linux/common/linux_ioctl.h>
     69  1.5.2.2  bouyer #include <compat/linux/common/linux_hdio.h>
     70  1.5.2.2  bouyer #include <compat/linux/common/linux_exec.h>
     71  1.5.2.2  bouyer #include <compat/linux/common/linux_machdep.h>
     72  1.5.2.2  bouyer 
     73  1.5.2.2  bouyer #include <compat/linux/linux_syscallargs.h>
     74  1.5.2.2  bouyer 
     75  1.5.2.2  bouyer #include <machine/cpu.h>
     76  1.5.2.2  bouyer #include <machine/psl.h>
     77  1.5.2.2  bouyer #include <machine/reg.h>
     78  1.5.2.2  bouyer #include <machine/vmparam.h>
     79  1.5.2.2  bouyer 
     80  1.5.2.2  bouyer /*
     81  1.5.2.2  bouyer  * To see whether wscons is configured (for virtual console ioctl calls).
     82  1.5.2.2  bouyer  */
     83  1.5.2.2  bouyer #if defined(_KERNEL) && !defined(_LKM)
     84  1.5.2.2  bouyer #include "wsdisplay.h"
     85  1.5.2.2  bouyer #endif
     86  1.5.2.2  bouyer #if (NWSDISPLAY > 0)
     87  1.5.2.2  bouyer #include <dev/wscons/wsconsio.h>
     88  1.5.2.2  bouyer #include <dev/wscons/wsdisplay_usl_io.h>
     89  1.5.2.2  bouyer #if defined(_KERNEL) && !defined(_LKM)
     90  1.5.2.2  bouyer #endif
     91  1.5.2.2  bouyer #endif
     92  1.5.2.2  bouyer 
     93  1.5.2.2  bouyer /*
     94  1.5.2.2  bouyer  * Set set up registers on exec.
     95  1.5.2.2  bouyer  * XXX not used at the moment since in sys/kern/exec_conf, LINUX_COMPAT
     96  1.5.2.2  bouyer  * entry uses NetBSD's native setregs instead of linux_setregs
     97  1.5.2.2  bouyer  */
     98  1.5.2.2  bouyer void
     99  1.5.2.2  bouyer linux_setregs(p, pack, stack)
    100  1.5.2.2  bouyer 	struct proc *p;
    101  1.5.2.2  bouyer 	struct exec_package *pack;
    102  1.5.2.2  bouyer 	u_long stack;
    103  1.5.2.2  bouyer {
    104  1.5.2.2  bouyer 	setregs(p, pack, stack);
    105  1.5.2.2  bouyer }
    106  1.5.2.2  bouyer 
    107  1.5.2.2  bouyer /*
    108  1.5.2.2  bouyer  * Send an interrupt to process.
    109  1.5.2.2  bouyer  *
    110  1.5.2.2  bouyer  * Adapted from arch/powerpc/powerpc/sig_machdep.c:sendsig and
    111  1.5.2.2  bouyer  * compat/linux/arch/i386/linux_machdep.c:linux_sendsig
    112  1.5.2.2  bouyer  *
    113  1.5.2.2  bouyer  * XXX Does not work well yet.
    114  1.5.2.2  bouyer  *
    115  1.5.2.2  bouyer  */
    116  1.5.2.2  bouyer 
    117  1.5.2.2  bouyer void
    118  1.5.2.2  bouyer linux_sendsig(catcher, sig, mask, code)  /* XXX Check me */
    119  1.5.2.2  bouyer 	sig_t catcher;
    120  1.5.2.2  bouyer 	int sig;
    121  1.5.2.2  bouyer 	sigset_t *mask;
    122  1.5.2.2  bouyer 	u_long code;
    123  1.5.2.2  bouyer {
    124  1.5.2.2  bouyer 	struct proc *p = curproc;
    125  1.5.2.2  bouyer 	struct trapframe *tf;
    126  1.5.2.2  bouyer 	struct linux_sigregs *fp, frame;
    127  1.5.2.2  bouyer 	struct linux_pt_regs linux_regs;
    128  1.5.2.2  bouyer 	struct linux_sigcontext sc;
    129  1.5.2.2  bouyer 	int onstack;
    130  1.5.2.2  bouyer 	int i;
    131  1.5.2.2  bouyer 
    132  1.5.2.2  bouyer 	tf = trapframe(p);
    133  1.5.2.2  bouyer 
    134  1.5.2.2  bouyer 	/*
    135  1.5.2.2  bouyer 	 * Do we need to jump onto the signal stack?
    136  1.5.2.2  bouyer 	 */
    137  1.5.2.2  bouyer 	onstack =
    138  1.5.2.2  bouyer 	    (p->p_sigctx.ps_sigstk.ss_flags & (SS_DISABLE | SS_ONSTACK)) == 0 &&
    139  1.5.2.2  bouyer 	    (SIGACTION(p, sig).sa_flags & SA_ONSTACK) != 0;
    140  1.5.2.2  bouyer 
    141  1.5.2.2  bouyer 	/*
    142  1.5.2.2  bouyer 	 * Signal stack is broken (see at the end of linux_sigreturn), so we do
    143  1.5.2.2  bouyer 	 * not use it yet. XXX fix this.
    144  1.5.2.2  bouyer 	 */
    145  1.5.2.2  bouyer 	onstack=0;
    146  1.5.2.2  bouyer 
    147  1.5.2.2  bouyer 	/*
    148  1.5.2.2  bouyer 	 * Allocate space for the signal handler context.
    149  1.5.2.2  bouyer 	 */
    150  1.5.2.2  bouyer 	if (onstack) {
    151  1.5.2.2  bouyer 		fp = (struct linux_sigregs *)
    152  1.5.2.2  bouyer 		    ((caddr_t)p->p_sigctx.ps_sigstk.ss_sp +
    153  1.5.2.2  bouyer 		    p->p_sigctx.ps_sigstk.ss_size);
    154  1.5.2.2  bouyer 	} else {
    155  1.5.2.2  bouyer 		fp = (struct linux_sigregs *)tf->fixreg[1];
    156  1.5.2.2  bouyer 	}
    157  1.5.2.2  bouyer 	fp = (struct linux_sigregs *)((int)(fp - 1) & ~0xf);
    158  1.5.2.2  bouyer 
    159  1.5.2.2  bouyer 	/*
    160  1.5.2.2  bouyer 	 * Prepare a sigcontext for later.
    161  1.5.2.2  bouyer 	 */
    162  1.5.2.2  bouyer 	sc.lsignal = (int)native_to_linux_sig[sig];
    163  1.5.2.2  bouyer 	sc.lhandler = (unsigned long)catcher;
    164  1.5.2.2  bouyer 	native_to_linux_old_sigset(mask, &sc.lmask);
    165  1.5.2.2  bouyer 	sc.lregs = (struct linux_pt_regs*)fp;
    166  1.5.2.2  bouyer 
    167  1.5.2.2  bouyer 	/*
    168  1.5.2.2  bouyer 	 * Setup the signal stack frame as Linux does it in
    169  1.5.2.2  bouyer 	 * arch/ppc/kernel/signal.c:setup_frame()
    170  1.5.2.2  bouyer 	 *
    171  1.5.2.2  bouyer 	 * Save register context.
    172  1.5.2.2  bouyer 	 */
    173  1.5.2.2  bouyer 	for (i = 0; i < 32; i++)
    174  1.5.2.2  bouyer 		linux_regs.lgpr[i] = tf->fixreg[i];
    175  1.5.2.2  bouyer 	linux_regs.lnip = tf->srr0;
    176  1.5.2.2  bouyer 	linux_regs.lmsr = tf->srr1;
    177  1.5.2.2  bouyer 	linux_regs.lorig_gpr3 = tf->fixreg[3]; /* XXX Is that right? */
    178  1.5.2.2  bouyer 	linux_regs.lctr = tf->ctr;
    179  1.5.2.2  bouyer 	linux_regs.llink = tf->lr;
    180  1.5.2.2  bouyer 	linux_regs.lxer = tf->xer;
    181  1.5.2.2  bouyer 	linux_regs.lccr = tf->cr;
    182  1.5.2.2  bouyer 	linux_regs.lmq = 0;  			/* Unused, 601 only */
    183  1.5.2.2  bouyer 	linux_regs.ltrap = 0; 	/* XXX What is ltrap counterpart in NetBSD ? */
    184  1.5.2.2  bouyer 	linux_regs.ldar = tf->dar;
    185  1.5.2.2  bouyer 	linux_regs.ldsisr = tf->dsisr;
    186  1.5.2.2  bouyer 	linux_regs.lresult = tf->exc;
    187  1.5.2.2  bouyer 	memcpy(&frame.lgp_regs, &linux_regs, sizeof(frame.lgp_regs));
    188  1.5.2.2  bouyer 
    189  1.5.2.2  bouyer 	/*
    190  1.5.2.2  bouyer 	 * NetBSD does not uses the FPU in the kernel, so there is no
    191  1.5.2.2  bouyer 	 * need to save floating point register. However, Linux expects
    192  1.5.2.2  bouyer 	 * them to be saved on the stack. Therefore we just keep a
    193  1.5.2.2  bouyer 	 * gap of zero'ed data where the FP registers should be stored
    194  1.5.2.2  bouyer 	 */
    195  1.5.2.2  bouyer 	memset(&frame.lfp_regs, 0, sizeof (frame.lfp_regs));
    196  1.5.2.2  bouyer 
    197  1.5.2.2  bouyer 	/*
    198  1.5.2.2  bouyer 	 * Copy Linux's signal trampoline on the user stack It should not
    199  1.5.2.2  bouyer 	 * be used, but Linux binaries might expect him to be there.
    200  1.5.2.2  bouyer 	 */
    201  1.5.2.2  bouyer 	frame.ltramp[0] = 0x38997777; /* li r0, 0x7777 */
    202  1.5.2.2  bouyer 	frame.ltramp[1] = 0x44000002; /* sc */
    203  1.5.2.2  bouyer 
    204  1.5.2.2  bouyer 	/*
    205  1.5.2.2  bouyer 	 * Move it to the user stack
    206  1.5.2.2  bouyer 	 * There is a little trick here, about the LINUX_ABIGAP: the
    207  1.5.2.2  bouyer 	 * linux_sigreg structure has a 56 int gap to support rs6000/xcoff
    208  1.5.2.2  bouyer 	 * binaries. But the Linux kernel seems to do without it, and it
    209  1.5.2.2  bouyer 	 * just skip it when building the stack frame. Hence the LINUX_ABIGAP.
    210  1.5.2.2  bouyer 	 */
    211  1.5.2.2  bouyer 	if (copyout(&frame, fp, sizeof (frame) - LINUX_ABIGAP) != 0) {
    212  1.5.2.2  bouyer 		/*
    213  1.5.2.2  bouyer 		 * Process has trashed its stack; give it an illegal
    214  1.5.2.2  bouyer 		 * instructoin to halt it in its tracks.
    215  1.5.2.2  bouyer 		 */
    216  1.5.2.2  bouyer 		sigexit(p, SIGILL);
    217  1.5.2.2  bouyer 		/* NOTREACHED */
    218  1.5.2.2  bouyer 	}
    219  1.5.2.2  bouyer 
    220  1.5.2.2  bouyer 	/*
    221  1.5.2.2  bouyer 	 * adjust stack pointer after the previous data copy
    222  1.5.2.2  bouyer 	 */
    223  1.5.2.2  bouyer 	fp = (struct linux_sigregs *)
    224  1.5.2.2  bouyer 	    ((unsigned long)fp - (sizeof (frame) - LINUX_ABIGAP));
    225  1.5.2.2  bouyer 
    226  1.5.2.2  bouyer 	/*
    227  1.5.2.2  bouyer 	 * "Mind the gap" Linux expects a gap here.
    228  1.5.2.2  bouyer 	 */
    229  1.5.2.2  bouyer 	fp = (struct linux_sigregs *)
    230  1.5.2.2  bouyer 	    ((unsigned long)fp - LINUX__SIGNAL_FRAMESIZE);
    231  1.5.2.2  bouyer 
    232  1.5.2.2  bouyer 	/*
    233  1.5.2.2  bouyer 	 * Add a sigcontext on the stack
    234  1.5.2.2  bouyer 	 */
    235  1.5.2.2  bouyer 	if (copyout(&sc, fp, sizeof (struct linux_sigcontext)) != 0) {
    236  1.5.2.2  bouyer 		/*
    237  1.5.2.2  bouyer 		 * Process has trashed its stack; give it an illegal
    238  1.5.2.2  bouyer 		 * instructoin to halt it in its tracks.
    239  1.5.2.2  bouyer 		 */
    240  1.5.2.2  bouyer 		sigexit(p, SIGILL);
    241  1.5.2.2  bouyer 		/* NOTREACHED */
    242  1.5.2.2  bouyer 	}
    243  1.5.2.2  bouyer 
    244  1.5.2.2  bouyer 	/*
    245  1.5.2.2  bouyer 	 * Here, I expected to need a stack pointer adjust after the copy.
    246  1.5.2.2  bouyer 	 * Something like this: (unsigned long)fp-=sizeof(struct sigcontext)
    247  1.5.2.2  bouyer 	 * But if we do it, the signal handler does not get its arguments as
    248  1.5.2.2  bouyer 	 * expected.
    249  1.5.2.2  bouyer 	 */
    250  1.5.2.2  bouyer 
    251  1.5.2.2  bouyer 	/*
    252  1.5.2.2  bouyer 	 * Set the registers according to how the Linux process expects them
    253  1.5.2.2  bouyer 	 */
    254  1.5.2.2  bouyer 	tf->fixreg[1] = (int)fp;
    255  1.5.2.2  bouyer 	tf->lr = (int)catcher;
    256  1.5.2.2  bouyer 	tf->fixreg[3] = (int)sig;
    257  1.5.2.2  bouyer 	tf->fixreg[4] = (int)&fp->lgp_regs;
    258  1.5.2.2  bouyer 	tf->srr0 = (int)p->p_sigctx.ps_sigcode;
    259  1.5.2.2  bouyer 
    260  1.5.2.2  bouyer 	/*
    261  1.5.2.2  bouyer 	 * Remember that we're now on the signal stack.
    262  1.5.2.2  bouyer 	 */
    263  1.5.2.2  bouyer 	if (onstack)
    264  1.5.2.2  bouyer 		p->p_sigctx.ps_sigstk.ss_flags |= SS_ONSTACK;
    265  1.5.2.2  bouyer #ifdef DEBUG_LINUX
    266  1.5.2.2  bouyer 	printf("linux_sendsig: exitting. fp=0x%lx\n",(long)fp);
    267  1.5.2.2  bouyer #endif
    268  1.5.2.2  bouyer }
    269  1.5.2.2  bouyer 
    270  1.5.2.2  bouyer /*
    271  1.5.2.2  bouyer  * System call to cleanup state after a signal
    272  1.5.2.2  bouyer  * has been taken.  Reset signal mask and
    273  1.5.2.2  bouyer  * stack state from context left by sendsig (above).
    274  1.5.2.2  bouyer  * Return to previous pc and psl as specified by
    275  1.5.2.2  bouyer  * context left by sendsig. Check carefully to
    276  1.5.2.2  bouyer  * make sure that the user has not modified the
    277  1.5.2.2  bouyer  * psl to gain improper privileges or to cause
    278  1.5.2.2  bouyer  * a machine fault.
    279  1.5.2.2  bouyer  *
    280  1.5.2.2  bouyer  * XXX not tested
    281  1.5.2.2  bouyer  */
    282  1.5.2.2  bouyer int
    283  1.5.2.2  bouyer linux_sys_rt_sigreturn(p, v, retval)
    284  1.5.2.2  bouyer 	struct proc *p;
    285  1.5.2.2  bouyer 	void *v;
    286  1.5.2.2  bouyer 	register_t *retval;
    287  1.5.2.2  bouyer {
    288  1.5.2.2  bouyer 	struct linux_sys_rt_sigreturn_args /* {
    289  1.5.2.2  bouyer 		syscallarg(struct linux_rt_sigframe *) sfp;
    290  1.5.2.2  bouyer 	} */ *uap = v;
    291  1.5.2.2  bouyer 	struct linux_rt_sigframe *scp, sigframe;
    292  1.5.2.2  bouyer 	struct trapframe *tf;
    293  1.5.2.2  bouyer 	sigset_t mask;
    294  1.5.2.2  bouyer 	int i;
    295  1.5.2.2  bouyer 
    296  1.5.2.2  bouyer 	/*
    297  1.5.2.2  bouyer 	 * The trampoline code hands us the context.
    298  1.5.2.2  bouyer 	 * It is unsafe to keep track of it ourselves, in the event that a
    299  1.5.2.2  bouyer 	 * program jumps out of a signal handler.
    300  1.5.2.2  bouyer 	 */
    301  1.5.2.2  bouyer 	scp = SCARG(uap, sfp);
    302  1.5.2.2  bouyer 
    303  1.5.2.2  bouyer 	/*
    304  1.5.2.2  bouyer 	 * It seems we need a 16 bytes alignement here (it just works with it,
    305  1.5.2.2  bouyer 	 * don't ask me why
    306  1.5.2.2  bouyer 	 */
    307  1.5.2.2  bouyer 	scp = (struct linux_rt_sigframe *)((unsigned long)scp & ~0xfUL);
    308  1.5.2.2  bouyer 
    309  1.5.2.2  bouyer 	/*
    310  1.5.2.2  bouyer 	 * Get the context from user stack
    311  1.5.2.2  bouyer 	 */
    312  1.5.2.2  bouyer 	if (copyin((caddr_t)scp, &sigframe, sizeof(*scp)) != 0)
    313  1.5.2.2  bouyer 		return (EFAULT);
    314  1.5.2.2  bouyer 
    315  1.5.2.2  bouyer 	/*
    316  1.5.2.2  bouyer 	 * Grab the signal mask
    317  1.5.2.2  bouyer 	 */
    318  1.5.2.2  bouyer 	linux_to_native_sigset(&sigframe.luc.luc_sigmask, &mask);
    319  1.5.2.2  bouyer 
    320  1.5.2.2  bouyer 	/*
    321  1.5.2.2  bouyer 	 *  Restore register context. XXX need security review
    322  1.5.2.2  bouyer 	 */
    323  1.5.2.2  bouyer 	tf = trapframe(p);
    324  1.5.2.2  bouyer #ifdef DEBUG_LINUX
    325  1.5.2.2  bouyer 	printf("linux_sys_sigreturn: trapframe=0x%lx scp=0x%lx\n",
    326  1.5.2.2  bouyer 	    (unsigned long)tf, (unsigned long)scp);
    327  1.5.2.2  bouyer #endif
    328  1.5.2.2  bouyer 
    329  1.5.2.2  bouyer 	if ((sigframe.luc.luc_context.lregs->lmsr & PSL_USERSTATIC) !=
    330  1.5.2.2  bouyer 	    (tf->srr1 & PSL_USERSTATIC))
    331  1.5.2.2  bouyer 		return (EINVAL);
    332  1.5.2.2  bouyer 
    333  1.5.2.2  bouyer 	for (i = 0; i < 32; i++)
    334  1.5.2.2  bouyer 		tf->fixreg[i] = sigframe.luc.luc_context.lregs->lgpr[i];
    335  1.5.2.2  bouyer 	tf->lr = sigframe.luc.luc_context.lregs->llink;
    336  1.5.2.2  bouyer 	tf->cr = sigframe.luc.luc_context.lregs->lccr;
    337  1.5.2.2  bouyer 	tf->xer = sigframe.luc.luc_context.lregs->lxer;
    338  1.5.2.2  bouyer 	tf->ctr = sigframe.luc.luc_context.lregs->lctr;
    339  1.5.2.2  bouyer 	tf->srr0 = sigframe.luc.luc_context.lregs->lnip;
    340  1.5.2.2  bouyer 	tf->srr1 = sigframe.luc.luc_context.lregs->lmsr;
    341  1.5.2.2  bouyer 	tf->dar = sigframe.luc.luc_context.lregs->ldar;
    342  1.5.2.2  bouyer 	tf->dsisr = sigframe.luc.luc_context.lregs->ldsisr;
    343  1.5.2.2  bouyer 	tf->exc = sigframe.luc.luc_context.lregs->lresult;
    344  1.5.2.2  bouyer 
    345  1.5.2.2  bouyer 	/*
    346  1.5.2.2  bouyer 	 * Restore signal stack.
    347  1.5.2.2  bouyer 	 *
    348  1.5.2.2  bouyer 	 * XXX cannot find the onstack information in Linux sig context.
    349  1.5.2.2  bouyer 	 * Is signal stack really supported on Linux?
    350  1.5.2.2  bouyer 	 *
    351  1.5.2.2  bouyer 	 * It seems to be supported in libc6...
    352  1.5.2.2  bouyer 	 */
    353  1.5.2.2  bouyer 	/* if (sc.sc_onstack & SS_ONSTACK)
    354  1.5.2.2  bouyer 		p->p_sigctx.ps_sigstk.ss_flags |= SS_ONSTACK;
    355  1.5.2.2  bouyer 	else */
    356  1.5.2.2  bouyer 		p->p_sigctx.ps_sigstk.ss_flags &= ~SS_ONSTACK;
    357  1.5.2.2  bouyer 
    358  1.5.2.2  bouyer 	return (EJUSTRETURN);
    359  1.5.2.2  bouyer }
    360  1.5.2.2  bouyer 
    361  1.5.2.2  bouyer 
    362  1.5.2.2  bouyer /*
    363  1.5.2.2  bouyer  * The following needs code review for potential security issues
    364  1.5.2.2  bouyer  */
    365  1.5.2.2  bouyer int
    366  1.5.2.2  bouyer linux_sys_sigreturn(p, v, retval)
    367  1.5.2.2  bouyer 	struct proc *p;
    368  1.5.2.2  bouyer 	void *v;
    369  1.5.2.2  bouyer 	register_t *retval;
    370  1.5.2.2  bouyer {
    371  1.5.2.2  bouyer 	struct linux_sys_sigreturn_args /* {
    372  1.5.2.2  bouyer 		syscallarg(struct linux_sigcontext *) scp;
    373  1.5.2.2  bouyer 	} */ *uap = v;
    374  1.5.2.2  bouyer 	struct linux_sigcontext *scp, context;
    375  1.5.2.2  bouyer 	struct trapframe *tf;
    376  1.5.2.2  bouyer 	sigset_t mask;
    377  1.5.2.2  bouyer 	int i;
    378  1.5.2.2  bouyer 
    379  1.5.2.2  bouyer 	/*
    380  1.5.2.2  bouyer 	 * The trampoline code hands us the context.
    381  1.5.2.2  bouyer 	 * It is unsafe to keep track of it ourselves, in the event that a
    382  1.5.2.2  bouyer 	 * program jumps out of a signal handler.
    383  1.5.2.2  bouyer 	 */
    384  1.5.2.2  bouyer 	scp = SCARG(uap, scp);
    385  1.5.2.2  bouyer 
    386  1.5.2.2  bouyer 	/*
    387  1.5.2.2  bouyer 	 * It seems we need a 16 bytes alignement here (it just works with it,
    388  1.5.2.2  bouyer 	 * don't ask me why
    389  1.5.2.2  bouyer 	 */
    390  1.5.2.2  bouyer 	(unsigned long)scp = (unsigned long) scp & ~0xfUL;
    391  1.5.2.2  bouyer 
    392  1.5.2.2  bouyer 	/*
    393  1.5.2.2  bouyer 	 * Get the context from user stack
    394  1.5.2.2  bouyer 	 */
    395  1.5.2.2  bouyer 	if (copyin(scp, &context, sizeof(struct linux_sigcontext)) != 0)
    396  1.5.2.2  bouyer 		return (EFAULT);
    397  1.5.2.2  bouyer 
    398  1.5.2.2  bouyer 	/*
    399  1.5.2.2  bouyer 	 *  Restore register context. XXX need security review
    400  1.5.2.2  bouyer 	 */
    401  1.5.2.2  bouyer 	tf = trapframe(p);
    402  1.5.2.2  bouyer #ifdef DEBUG_LINUX
    403  1.5.2.2  bouyer 	printf("linux_sys_sigreturn: trapframe=0x%lx scp=0x%lx\n",
    404  1.5.2.2  bouyer 	    (unsigned long)tf, (unsigned long)scp);
    405  1.5.2.2  bouyer #endif
    406  1.5.2.2  bouyer 
    407  1.5.2.2  bouyer 	if ((context.lregs->lmsr & PSL_USERSTATIC) !=
    408  1.5.2.2  bouyer 	    (tf->srr1 & PSL_USERSTATIC))
    409  1.5.2.2  bouyer 		return (EINVAL);
    410  1.5.2.2  bouyer 
    411  1.5.2.2  bouyer 	for (i = 0; i < 32; i++)
    412  1.5.2.2  bouyer 		tf->fixreg[i] = context.lregs->lgpr[i];
    413  1.5.2.2  bouyer 	tf->lr = context.lregs->llink;
    414  1.5.2.2  bouyer 	tf->cr = context.lregs->lccr;
    415  1.5.2.2  bouyer 	tf->xer = context.lregs->lxer;
    416  1.5.2.2  bouyer 	tf->ctr = context.lregs->lctr;
    417  1.5.2.2  bouyer 	tf->srr0 = context.lregs->lnip;
    418  1.5.2.2  bouyer 	tf->srr1 = context.lregs->lmsr;
    419  1.5.2.2  bouyer 	tf->dar = context.lregs->ldar;
    420  1.5.2.2  bouyer 	tf->dsisr = context.lregs->ldsisr;
    421  1.5.2.2  bouyer 	tf->exc = context.lregs->lresult;
    422  1.5.2.2  bouyer 
    423  1.5.2.2  bouyer 	/*
    424  1.5.2.2  bouyer 	 * Restore signal stack.
    425  1.5.2.2  bouyer 	 *
    426  1.5.2.2  bouyer 	 * XXX cannot find the onstack information in Linux sig context.
    427  1.5.2.2  bouyer 	 * Is signal stack really supported on Linux?
    428  1.5.2.2  bouyer 	 */
    429  1.5.2.2  bouyer #if 0
    430  1.5.2.2  bouyer 	if (sc.sc_onstack & SS_ONSTACK)
    431  1.5.2.2  bouyer 		p->p_sigctx.ps_sigstk.ss_flags |= SS_ONSTACK;
    432  1.5.2.2  bouyer 	else
    433  1.5.2.2  bouyer #endif
    434  1.5.2.2  bouyer 		p->p_sigctx.ps_sigstk.ss_flags &= ~SS_ONSTACK;
    435  1.5.2.2  bouyer 
    436  1.5.2.2  bouyer 	/* Restore signal mask. */
    437  1.5.2.2  bouyer 	linux_old_to_native_sigset(&context.lmask, &mask);
    438  1.5.2.2  bouyer 	(void) sigprocmask1(p, SIG_SETMASK, &mask, 0);
    439  1.5.2.2  bouyer 
    440  1.5.2.2  bouyer 	return (EJUSTRETURN);
    441  1.5.2.2  bouyer }
    442  1.5.2.2  bouyer 
    443  1.5.2.2  bouyer 
    444  1.5.2.2  bouyer int
    445  1.5.2.2  bouyer linux_sys_modify_ldt(p, v, retval)
    446  1.5.2.2  bouyer 	struct proc *p;
    447  1.5.2.2  bouyer 	void *v;
    448  1.5.2.2  bouyer 	register_t *retval;
    449  1.5.2.2  bouyer {
    450  1.5.2.2  bouyer 	/*
    451  1.5.2.2  bouyer 	 * This syscall is not implemented in Linux/PowerPC: we should not
    452  1.5.2.2  bouyer 	 * be here
    453  1.5.2.2  bouyer 	 */
    454  1.5.2.2  bouyer #ifdef DEBUG_LINUX
    455  1.5.2.2  bouyer 	printf("linux_sys_modify_ldt: should not be here.\n");
    456  1.5.2.2  bouyer #endif
    457  1.5.2.2  bouyer   return 0;
    458  1.5.2.2  bouyer }
    459  1.5.2.2  bouyer 
    460  1.5.2.2  bouyer /* hack to make svgalib work */
    461  1.5.2.2  bouyer dev_t
    462  1.5.2.2  bouyer linux_fakedev(dev)
    463  1.5.2.2  bouyer 	dev_t dev;
    464  1.5.2.2  bouyer {
    465  1.5.2.2  bouyer   /* XXX write me */
    466  1.5.2.2  bouyer   return dev;
    467  1.5.2.2  bouyer }
    468  1.5.2.2  bouyer 
    469  1.5.2.2  bouyer /*
    470  1.5.2.2  bouyer  * We come here in a last attempt to satisfy a Linux ioctl() call
    471  1.5.2.2  bouyer  */
    472  1.5.2.2  bouyer int
    473  1.5.2.2  bouyer linux_machdepioctl(p, v, retval)
    474  1.5.2.2  bouyer 	struct proc *p;
    475  1.5.2.2  bouyer 	void *v;
    476  1.5.2.2  bouyer 	register_t *retval;
    477  1.5.2.2  bouyer {
    478  1.5.2.2  bouyer 	struct linux_sys_ioctl_args /* {
    479  1.5.2.2  bouyer 		syscallarg(int) fd;
    480  1.5.2.2  bouyer 		syscallarg(u_long) com;
    481  1.5.2.2  bouyer 		syscallarg(caddr_t) data;
    482  1.5.2.2  bouyer 	} */ *uap = v;
    483  1.5.2.2  bouyer 	struct sys_ioctl_args bia;
    484  1.5.2.2  bouyer 	u_long com;
    485  1.5.2.2  bouyer 
    486  1.5.2.2  bouyer 	SCARG(&bia, fd) = SCARG(uap, fd);
    487  1.5.2.2  bouyer 	SCARG(&bia, data) = SCARG(uap, data);
    488  1.5.2.2  bouyer 	com = SCARG(uap, com);
    489  1.5.2.2  bouyer 
    490  1.5.2.2  bouyer 	switch (com) {
    491  1.5.2.2  bouyer 	default:
    492  1.5.2.2  bouyer 		printf("linux_machdepioctl: invalid ioctl %08lx\n", com);
    493  1.5.2.2  bouyer 		return EINVAL;
    494  1.5.2.2  bouyer 	}
    495  1.5.2.2  bouyer 	SCARG(&bia, com) = com;
    496  1.5.2.2  bouyer 	return sys_ioctl(p, &bia, retval);
    497  1.5.2.2  bouyer }
    498  1.5.2.2  bouyer /*
    499  1.5.2.2  bouyer  * Set I/O permissions for a process. Just set the maximum level
    500  1.5.2.2  bouyer  * right away (ignoring the argument), otherwise we would have
    501  1.5.2.2  bouyer  * to rely on I/O permission maps, which are not implemented.
    502  1.5.2.2  bouyer  */
    503  1.5.2.2  bouyer int
    504  1.5.2.2  bouyer linux_sys_iopl(p, v, retval)
    505  1.5.2.2  bouyer 	struct proc *p;
    506  1.5.2.2  bouyer 	void *v;
    507  1.5.2.2  bouyer 	register_t *retval;
    508  1.5.2.2  bouyer {
    509  1.5.2.2  bouyer 	/*
    510  1.5.2.2  bouyer 	 * This syscall is not implemented in Linux/PowerPC: we should not be here
    511  1.5.2.2  bouyer 	 */
    512  1.5.2.2  bouyer #ifdef DEBUG_LINUX
    513  1.5.2.2  bouyer 	printf("linux_sys_iopl: should not be here.\n");
    514  1.5.2.2  bouyer #endif
    515  1.5.2.2  bouyer 	return 0;
    516  1.5.2.2  bouyer }
    517  1.5.2.2  bouyer 
    518  1.5.2.2  bouyer /*
    519  1.5.2.2  bouyer  * See above. If a root process tries to set access to an I/O port,
    520  1.5.2.2  bouyer  * just let it have the whole range.
    521  1.5.2.2  bouyer  */
    522  1.5.2.2  bouyer int
    523  1.5.2.2  bouyer linux_sys_ioperm(p, v, retval)
    524  1.5.2.2  bouyer 	struct proc *p;
    525  1.5.2.2  bouyer 	void *v;
    526  1.5.2.2  bouyer 	register_t *retval;
    527  1.5.2.2  bouyer {
    528  1.5.2.2  bouyer 	/*
    529  1.5.2.2  bouyer 	 * This syscall is not implemented in Linux/PowerPC: we should not be here
    530  1.5.2.2  bouyer 	 */
    531  1.5.2.2  bouyer #ifdef DEBUG_LINUX
    532  1.5.2.2  bouyer 	printf("linux_sys_ioperm: should not be here.\n");
    533  1.5.2.2  bouyer #endif
    534  1.5.2.2  bouyer 	return 0;
    535  1.5.2.2  bouyer }
    536  1.5.2.2  bouyer 
    537  1.5.2.2  bouyer /*
    538  1.5.2.2  bouyer  * wrapper linux_sys_new_uname() -> linux_sys_uname()
    539  1.5.2.2  bouyer  */
    540  1.5.2.2  bouyer int
    541  1.5.2.2  bouyer linux_sys_new_uname(p, v, retval)
    542  1.5.2.2  bouyer 	struct proc *p;
    543  1.5.2.2  bouyer 	void *v;
    544  1.5.2.2  bouyer 	register_t *retval;
    545  1.5.2.2  bouyer {
    546  1.5.2.2  bouyer 	return linux_sys_uname(p, v, retval);
    547  1.5.2.2  bouyer }
    548  1.5.2.2  bouyer 
    549  1.5.2.2  bouyer /*
    550  1.5.2.2  bouyer  * wrapper linux_sys_new_select() -> linux_sys_select()
    551  1.5.2.2  bouyer  */
    552  1.5.2.2  bouyer int
    553  1.5.2.2  bouyer linux_sys_new_select(p, v, retval)
    554  1.5.2.2  bouyer 	struct proc *p;
    555  1.5.2.2  bouyer 	void *v;
    556  1.5.2.2  bouyer 	register_t *retval;
    557  1.5.2.2  bouyer {
    558  1.5.2.2  bouyer 	return linux_sys_select(p, v, retval);
    559  1.5.2.2  bouyer }
    560