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/ptrace_machdep.c

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    1 /*-
    2  * Copyright (c) 2014 Justin Hibbits
    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 THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   24  * SUCH DAMAGE.
   25  *
   26  */
   27 
   28 #include <sys/cdefs.h>
   29 __FBSDID("$FreeBSD: releng/11.1/sys/powerpc/powerpc/ptrace_machdep.c 277166 2015-01-14 07:01:21Z jhibbits $");
   30 
   31 #include "opt_compat.h"
   32 
   33 #include <sys/param.h>
   34 #include <sys/systm.h>
   35 #include <sys/malloc.h>
   36 #include <sys/proc.h>
   37 #include <sys/ptrace.h>
   38 #include <sys/sysent.h>
   39 #include <machine/altivec.h>
   40 #include <machine/cpu.h>
   41 #include <machine/md_var.h>
   42 #include <machine/pcb.h>
   43 
   44 int
   45 cpu_ptrace(struct thread *td, int req, void *addr, int data)
   46 {
   47         int error;
   48         struct pcb *pcb;
   49         struct vec vec;
   50 
   51         pcb = td->td_pcb;
   52 
   53         bzero(&vec, sizeof(vec));
   54 
   55         error = EINVAL;
   56         switch (req) {
   57         case PT_GETVRREGS:
   58                 if (!(cpu_features & PPC_FEATURE_HAS_ALTIVEC))
   59                         break;
   60 
   61                 if (pcb->pcb_flags & PCB_VEC) {
   62                         save_vec_nodrop(td);
   63                         memcpy(&vec, &pcb->pcb_vec, sizeof(vec));
   64                 }
   65                 error = copyout(&vec, addr, sizeof(vec));
   66                 break;
   67         case PT_SETVRREGS:
   68                 if (!(cpu_features & PPC_FEATURE_HAS_ALTIVEC))
   69                         break;
   70                 error = copyin(addr, &vec, sizeof(vec));
   71                 if (error == 0) {
   72                         pcb->pcb_flags |= PCB_VEC;
   73                         memcpy(&pcb->pcb_vec, &vec, sizeof(vec));
   74                 }
   75                 break;
   76 
   77         default:
   78                 break;
   79         }
   80 
   81         return (error);
   82 }

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