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/i386/i386/ptrace_machdep.c

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    1 /*-
    2  * Copyright (c) 2005 Doug Rabson
    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/10.2/sys/i386/i386/ptrace_machdep.c 279211 2015-02-23 18:38:41Z jhb $");
   30 
   31 #include "opt_cpu.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 <machine/md_var.h>
   39 #include <machine/pcb.h>
   40 
   41 #if !defined(CPU_DISABLE_SSE) && defined(I686_CPU)
   42 #define CPU_ENABLE_SSE
   43 #endif
   44 
   45 #ifdef CPU_ENABLE_SSE
   46 static int
   47 cpu_ptrace_xstate(struct thread *td, int req, void *addr, int data)
   48 {
   49         struct ptrace_xstate_info info;
   50         char *savefpu;
   51         int error;
   52 
   53         if (!use_xsave)
   54                 return (EOPNOTSUPP);
   55 
   56         switch (req) {
   57         case PT_GETXSTATE_OLD:
   58                 npxgetregs(td);
   59                 savefpu = (char *)(get_pcb_user_save_td(td) + 1);
   60                 error = copyout(savefpu, addr,
   61                     cpu_max_ext_state_size - sizeof(union savefpu));
   62                 break;
   63 
   64         case PT_SETXSTATE_OLD:
   65                 if (data > cpu_max_ext_state_size - sizeof(union savefpu)) {
   66                         error = EINVAL;
   67                         break;
   68                 }
   69                 savefpu = malloc(data, M_TEMP, M_WAITOK);
   70                 error = copyin(addr, savefpu, data);
   71                 if (error == 0) {
   72                         npxgetregs(td);
   73                         error = npxsetxstate(td, savefpu, data);
   74                 }
   75                 free(savefpu, M_TEMP);
   76                 break;
   77 
   78         case PT_GETXSTATE_INFO:
   79                 if (data != sizeof(info)) {
   80                         error  = EINVAL;
   81                         break;
   82                 }
   83                 info.xsave_len = cpu_max_ext_state_size;
   84                 info.xsave_mask = xsave_mask;
   85                 error = copyout(&info, addr, data);
   86                 break;
   87 
   88         case PT_GETXSTATE:
   89                 npxgetregs(td);
   90                 savefpu = (char *)(get_pcb_user_save_td(td));
   91                 error = copyout(savefpu, addr, cpu_max_ext_state_size);
   92                 break;
   93 
   94         case PT_SETXSTATE:
   95                 if (data < sizeof(union savefpu) ||
   96                     data > cpu_max_ext_state_size) {
   97                         error = EINVAL;
   98                         break;
   99                 }
  100                 savefpu = malloc(data, M_TEMP, M_WAITOK);
  101                 error = copyin(addr, savefpu, data);
  102                 if (error == 0)
  103                         error = npxsetregs(td, (union savefpu *)savefpu,
  104                             savefpu + sizeof(union savefpu), data -
  105                             sizeof(union savefpu));
  106                 free(savefpu, M_TEMP);
  107                 break;
  108 
  109         default:
  110                 error = EINVAL;
  111                 break;
  112         }
  113 
  114         return (error);
  115 }
  116 #endif
  117 
  118 int
  119 cpu_ptrace(struct thread *td, int req, void *addr, int data)
  120 {
  121 #ifdef CPU_ENABLE_SSE
  122         struct savexmm *fpstate;
  123         int error;
  124 
  125         if (!cpu_fxsr)
  126                 return (EINVAL);
  127 
  128         fpstate = &get_pcb_user_save_td(td)->sv_xmm;
  129         switch (req) {
  130         case PT_GETXMMREGS:
  131                 npxgetregs(td);
  132                 error = copyout(fpstate, addr, sizeof(*fpstate));
  133                 break;
  134 
  135         case PT_SETXMMREGS:
  136                 npxgetregs(td);
  137                 error = copyin(addr, fpstate, sizeof(*fpstate));
  138                 fpstate->sv_env.en_mxcsr &= cpu_mxcsr_mask;
  139                 break;
  140 
  141         case PT_GETXSTATE_OLD:
  142         case PT_SETXSTATE_OLD:
  143         case PT_GETXSTATE_INFO:
  144         case PT_GETXSTATE:
  145         case PT_SETXSTATE:
  146                 error = cpu_ptrace_xstate(td, req, addr, data);
  147                 break;
  148 
  149         default:
  150                 return (EINVAL);
  151         }
  152 
  153         return (error);
  154 #else
  155         return (EINVAL);
  156 #endif
  157 }

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