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("$FreeBSD$");
   30 
   31 #include <sys/param.h>
   32 #include <sys/systm.h>
   33 #include <sys/malloc.h>
   34 #include <sys/proc.h>
   35 #include <sys/ptrace.h>
   36 #include <sys/sysent.h>
   37 #include <machine/altivec.h>
   38 #include <machine/fpu.h>
   39 #include <machine/cpu.h>
   40 #include <machine/md_var.h>
   41 #include <machine/pcb.h>
   42 
   43 #ifdef __SPE__
   44 #define PPC_FEATURE_VECTOR      PPC_FEATURE_HAS_SPE
   45 #else
   46 #define PPC_FEATURE_VECTOR      PPC_FEATURE_HAS_ALTIVEC
   47 #endif
   48 
   49 int
   50 cpu_ptrace(struct thread *td, int req, void *addr, int data)
   51 {
   52         int error;
   53         struct pcb *pcb;
   54         struct vec vec;
   55         uint64_t vsr[32];
   56         uint64_t *vsr_dw1;
   57         int vsr_idx;
   58 
   59         pcb = td->td_pcb;
   60 
   61         bzero(&vec, sizeof(vec));
   62         bzero(vsr, sizeof(vsr));
   63 
   64         error = EINVAL;
   65         switch (req) {
   66         case PT_GETVRREGS:
   67                 if (!(cpu_features & PPC_FEATURE_VECTOR))
   68                         break;
   69 
   70                 if (pcb->pcb_flags & PCB_VEC) {
   71                         save_vec_nodrop(td);
   72                         memcpy(&vec, &pcb->pcb_vec, sizeof(vec));
   73                 }
   74                 error = copyout(&vec, addr, sizeof(vec));
   75                 break;
   76         case PT_SETVRREGS:
   77                 if (!(cpu_features & PPC_FEATURE_VECTOR))
   78                         break;
   79                 error = copyin(addr, &vec, sizeof(vec));
   80                 if (error == 0) {
   81                         pcb->pcb_flags |= PCB_VEC;
   82                         memcpy(&pcb->pcb_vec, &vec, sizeof(vec));
   83                 }
   84                 break;
   85         case PT_GETVSRREGS:
   86                 if (!(cpu_features & PPC_FEATURE_HAS_VSX))
   87                         break;
   88 
   89                 if (pcb->pcb_flags & PCB_VSX) {
   90                         save_fpu_nodrop(td);
   91 
   92                         /*
   93                          * Doubleword 0 of VSR0-VSR31 overlap with FPR0-FPR31 and
   94                          * VSR32-VSR63 overlap with VR0-VR31, so we only copy
   95                          * the non-overlapping data, which is doubleword 1 of VSR0-VSR31.
   96                          */
   97                         for (vsr_idx = 0; vsr_idx < nitems(vsr); vsr_idx++) {
   98                                 vsr_dw1 = (uint64_t *)&pcb->pcb_fpu.fpr[vsr_idx].vsr[2];
   99                                 vsr[vsr_idx] = *vsr_dw1;
  100                         }
  101                 }
  102                 error = copyout(&vsr, addr, sizeof(vsr));
  103                 break;
  104         case PT_SETVSRREGS:
  105                 if (!(cpu_features & PPC_FEATURE_HAS_VSX))
  106                         break;
  107                 error = copyin(addr, &vsr, sizeof(vsr));
  108                 if (error == 0) {
  109                         pcb->pcb_flags |= PCB_VSX;
  110 
  111                         /*
  112                          * Doubleword 0 of VSR0-VSR31 overlap with FPR0-FPR31 and
  113                          * VSR32-VSR63 overlap with VR0-VR31, so we only copy
  114                          * the non-overlapping data, which is doubleword 1 of VSR0-VSR31.
  115                          */
  116                         for (vsr_idx = 0; vsr_idx < nitems(vsr); vsr_idx++) {
  117                                 vsr_dw1 = (uint64_t *)&pcb->pcb_fpu.fpr[vsr_idx].vsr[2];
  118                                 *vsr_dw1 = vsr[vsr_idx];
  119                         }
  120                 }
  121                 break;
  122 
  123         default:
  124                 break;
  125         }
  126 
  127         return (error);
  128 }

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

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