The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/powerpc/powerpc/copyinout.c

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    1 /*
    2  * Copyright (C) 2002 Benno Rice
    3  * All rights reserved.
    4  *
    5  * Redistribution and use in source and binary forms, with or without
    6  * modification, are permitted provided that the following conditions
    7  * are met:
    8  * 1. Redistributions of source code must retain the above copyright
    9  *    notice, this list of conditions and the following disclaimer.
   10  * 2. Redistributions in binary form must reproduce the above copyright
   11  *    notice, this list of conditions and the following disclaimer in the
   12  *    documentation and/or other materials provided with the distribution.
   13  *
   14  * THIS SOFTWARE IS PROVIDED BY Benno Rice ``AS IS'' AND ANY EXPRESS OR
   15  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   16  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
   17  * IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
   18  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
   19  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
   20  * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
   21  * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
   22  * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
   23  * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   24 */
   25 /*-
   26  * Copyright (C) 1993 Wolfgang Solfrank.
   27  * Copyright (C) 1993 TooLs GmbH.
   28  * All rights reserved.
   29  *
   30  * Redistribution and use in source and binary forms, with or without
   31  * modification, are permitted provided that the following conditions
   32  * are met:
   33  * 1. Redistributions of source code must retain the above copyright
   34  *    notice, this list of conditions and the following disclaimer.
   35  * 2. Redistributions in binary form must reproduce the above copyright
   36  *    notice, this list of conditions and the following disclaimer in the
   37  *    documentation and/or other materials provided with the distribution.
   38  * 3. All advertising materials mentioning features or use of this software
   39  *    must display the following acknowledgement:
   40  *      This product includes software developed by TooLs GmbH.
   41  * 4. The name of TooLs GmbH may not be used to endorse or promote products
   42  *    derived from this software without specific prior written permission.
   43  *
   44  * THIS SOFTWARE IS PROVIDED BY TOOLS GMBH ``AS IS'' AND ANY EXPRESS OR
   45  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   46  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
   47  * IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
   48  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
   49  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
   50  * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
   51  * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
   52  * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
   53  * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   54  */
   55 
   56 #include <sys/cdefs.h>
   57 __FBSDID("$FreeBSD: releng/5.2/sys/powerpc/powerpc/copyinout.c 113038 2003-04-03 21:36:33Z obrien $");
   58 
   59 #include <sys/param.h>
   60 #include <sys/systm.h>
   61 #include <sys/proc.h>
   62 
   63 #include <vm/vm.h>
   64 #include <vm/pmap.h>
   65 #include <vm/vm_map.h>
   66 
   67 int     setfault(faultbuf);     /* defined in locore.S */
   68 
   69 /*
   70  * Makes sure that the right segment of userspace is mapped in.
   71  */
   72 static __inline void
   73 set_user_sr(register_t vsid)
   74 {
   75 
   76         isync();
   77         __asm __volatile ("mtsr %0,%1" :: "n"(USER_SR), "r"(vsid));
   78         isync();
   79 }
   80 
   81 int
   82 copyout(const void *kaddr, void *udaddr, size_t len)
   83 {
   84         struct          thread *td;
   85         pmap_t          pm;
   86         faultbuf        env;
   87         const char      *kp;
   88         char            *up, *p;
   89         size_t          l;
   90 
   91         td = PCPU_GET(curthread);
   92         pm = &td->td_proc->p_vmspace->vm_pmap;
   93 
   94         if (setfault(env)) {
   95                 td->td_pcb->pcb_onfault = NULL;
   96                 return (EFAULT);
   97         }
   98 
   99         kp = kaddr;
  100         up = udaddr;
  101 
  102         while (len > 0) {
  103                 p = (char *)USER_ADDR + ((u_int)up & ~SEGMENT_MASK);
  104 
  105                 l = ((char *)USER_ADDR + SEGMENT_LENGTH) - p;
  106                 if (l > len)
  107                         l = len;
  108 
  109                 set_user_sr(pm->pm_sr[(u_int)up >> ADDR_SR_SHFT]);
  110 
  111                 bcopy(kp, p, l);
  112 
  113                 up += l;
  114                 kp += l;
  115                 len -= l;
  116         }
  117 
  118         td->td_pcb->pcb_onfault = NULL;
  119         return (0);
  120 }
  121 
  122 int
  123 copyin(const void *udaddr, void *kaddr, size_t len)
  124 {
  125         struct          thread *td;
  126         pmap_t          pm;
  127         faultbuf        env;
  128         const char      *up;
  129         char            *kp, *p;
  130         size_t          l;
  131 
  132         td = PCPU_GET(curthread);
  133         pm = &td->td_proc->p_vmspace->vm_pmap;
  134 
  135         if (setfault(env)) {
  136                 td->td_pcb->pcb_onfault = NULL;
  137                 return (EFAULT);
  138         }
  139 
  140         kp = kaddr;
  141         up = udaddr;
  142 
  143         while (len > 0) {
  144                 p = (char *)USER_ADDR + ((u_int)up & ~SEGMENT_MASK);
  145 
  146                 l = ((char *)USER_ADDR + SEGMENT_LENGTH) - p;
  147                 if (l > len)
  148                         l = len;
  149 
  150                 set_user_sr(pm->pm_sr[(u_int)up >> ADDR_SR_SHFT]);
  151 
  152                 bcopy(p, kp, l);
  153 
  154                 up += l;
  155                 kp += l;
  156                 len -= l;
  157         }
  158 
  159         td->td_pcb->pcb_onfault = NULL;
  160         return (0);
  161 }
  162 
  163 int
  164 copyinstr(const void *udaddr, void *kaddr, size_t len, size_t *done)
  165 {
  166         struct          thread *td;
  167         pmap_t          pm;
  168         faultbuf        env;
  169         const char      *up;
  170         char            *kp;
  171         size_t          l;
  172         int             rv, c;
  173 
  174         td = PCPU_GET(curthread);
  175         pm = &td->td_proc->p_vmspace->vm_pmap;
  176 
  177         if (setfault(env)) {
  178                 td->td_pcb->pcb_onfault = NULL;
  179                 return (EFAULT);
  180         }
  181 
  182         kp = kaddr;
  183         up = udaddr;
  184 
  185         rv = ENAMETOOLONG;
  186 
  187         for (l = 0; len-- > 0; l++) {
  188                 if ((c = fubyte(up++)) < 0) {
  189                         rv = EFAULT;
  190                         break;
  191                 }
  192 
  193                 if (!(*kp++ = c)) {
  194                         l++;
  195                         rv = 0;
  196                         break;
  197                 }
  198         }
  199 
  200         if (done != NULL) {
  201                 *done = l;
  202         }
  203 
  204         td->td_pcb->pcb_onfault = NULL;
  205         return (rv);
  206 }
  207 
  208 int
  209 subyte(void *addr, int byte)
  210 {
  211         struct          thread *td;
  212         pmap_t          pm;
  213         faultbuf        env;
  214         char            *p;
  215 
  216         td = PCPU_GET(curthread);
  217         pm = &td->td_proc->p_vmspace->vm_pmap;
  218         p = (char *)((u_int)USER_ADDR + ((u_int)addr & ~SEGMENT_MASK));
  219 
  220         if (setfault(env)) {
  221                 td->td_pcb->pcb_onfault = NULL;
  222                 return (-1);
  223         }
  224 
  225         set_user_sr(pm->pm_sr[(u_int)addr >> ADDR_SR_SHFT]);
  226 
  227         *p = (char)byte;
  228 
  229         td->td_pcb->pcb_onfault = NULL;
  230         return (0);
  231 }
  232 
  233 int
  234 suword(void *addr, long word)
  235 {
  236         struct          thread *td;
  237         pmap_t          pm;
  238         faultbuf        env;
  239         long            *p;
  240 
  241         td = PCPU_GET(curthread);
  242         pm = &td->td_proc->p_vmspace->vm_pmap;
  243         p = (long *)((u_int)USER_ADDR + ((u_int)addr & ~SEGMENT_MASK));
  244 
  245         if (setfault(env)) {
  246                 td->td_pcb->pcb_onfault = NULL;
  247                 return (-1);
  248         }
  249 
  250         set_user_sr(pm->pm_sr[(u_int)addr >> ADDR_SR_SHFT]);
  251 
  252         *p = word;
  253 
  254         td->td_pcb->pcb_onfault = NULL;
  255         return (0);
  256 }
  257 
  258 int
  259 suword32(void *addr, int32_t word)
  260 {
  261         return (suword(addr, (long)word));
  262 }
  263 
  264 
  265 int
  266 fubyte(const void *addr)
  267 {
  268         struct          thread *td;
  269         pmap_t          pm;
  270         faultbuf        env;
  271         u_char          *p;
  272         int             val;
  273 
  274         td = PCPU_GET(curthread);
  275         pm = &td->td_proc->p_vmspace->vm_pmap;
  276         p = (u_char *)((u_int)USER_ADDR + ((u_int)addr & ~SEGMENT_MASK));
  277 
  278         if (setfault(env)) {
  279                 td->td_pcb->pcb_onfault = NULL;
  280                 return (-1);
  281         }
  282 
  283         set_user_sr(pm->pm_sr[(u_int)addr >> ADDR_SR_SHFT]);
  284 
  285         val = *p;
  286 
  287         td->td_pcb->pcb_onfault = NULL;
  288         return (val);
  289 }
  290 
  291 long
  292 fuword(const void *addr)
  293 {
  294         struct          thread *td;
  295         pmap_t          pm;
  296         faultbuf        env;
  297         long            *p, val;
  298 
  299         td = PCPU_GET(curthread);
  300         pm = &td->td_proc->p_vmspace->vm_pmap;
  301         p = (long *)((u_int)USER_ADDR + ((u_int)addr & ~SEGMENT_MASK));
  302 
  303         if (setfault(env)) {
  304                 td->td_pcb->pcb_onfault = NULL;
  305                 return (-1);
  306         }
  307 
  308         set_user_sr(pm->pm_sr[(u_int)addr >> ADDR_SR_SHFT]);
  309 
  310         val = *p;
  311 
  312         td->td_pcb->pcb_onfault = NULL;
  313         return (val);
  314 }
  315 
  316 int32_t
  317 fuword32(const void *addr)
  318 {
  319         return ((int32_t)fuword(addr));
  320 }

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