sys/compat/mach/arch/powerpc/fasttraps/mach_fasttraps_thread.c

   1 /*      $NetBSD: mach_fasttraps_thread.c,v 1.11 2007/12/29 18:12:37 dsl Exp $ */
   2
   3 /*-
   4  * Copyright (c) 2002 The NetBSD Foundation, Inc.
   5  * All rights reserved.
   6  *
   7  * This code is derived from software contributed to The NetBSD Foundation
   8  * by Emmanuel Dreyfus.
   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
  32 #include <sys/cdefs.h>
  33 __KERNEL_RCSID(0, "$NetBSD: mach_fasttraps_thread.c,v 1.11 2007/12/29 18:12:37 dsl Exp $");
  34
  35 #include <sys/types.h>
  36 #include <sys/systm.h>
  37 #include <sys/param.h>
  38 #include <sys/signal.h>
  39 #include <sys/proc.h>
  40 #include <sys/exec.h>
  41
  42 #include <compat/mach/mach_types.h>
  43 #include <compat/mach/mach_exec.h>
  44
  45 #include <compat/mach/arch/powerpc/fasttraps/mach_fasttraps_syscall.h>
  46 #include <compat/mach/arch/powerpc/fasttraps/mach_fasttraps_syscallargs.h>
  47
  48 int
  49 mach_sys_cthread_set_self(struct lwp *l, const struct mach_sys_cthread_set_self_args *uap, register_t *retval)
  50 {
  51         /* {
  52                 syscallarg(mach_cproc_t) p;
  53         } */
  54         struct mach_emuldata *med;
  55
  56         l->l_private = (void *)SCARG(uap, p);
  57
  58         med = l->l_proc->p_emuldata;
  59         med->med_dirty_thid = 0;
  60
  61         return 0;
  62 }
  63
  64 int
  65 mach_sys_cthread_self(struct lwp *l, const void *v, register_t *retval)
  66 {
  67         struct mach_emuldata *med;
  68
  69         /*
  70          * After a fork or exec, l_private is not initialized.
  71          * We have no way of setting it before, so we keep track
  72          * of it being uninitialized with med_dirty_thid.
  73          * XXX This is probably not the most efficient way
  74          */
  75         med = l->l_proc->p_emuldata;
  76         if (med->med_dirty_thid != 0) {
  77                 l->l_private = NULL;
  78                 med->med_dirty_thid = 0;
  79         }
  80
  81         *retval = (register_t)l->l_private;
  82         return 0;
  83 }