ptrace_machdep.c

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    1 /*-
    2  * Copyright (c) 2011 Konstantin Belousov <kib@FreeBSD.org>
    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/8.4/sys/amd64/amd64/ptrace_machdep.c 237009 2012-06-13 15:25:52Z jhb $");
   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/md_var.h>
   40 #include <machine/pcb.h>
   41 
   42 static int
   43 cpu_ptrace_xstate(struct thread *td, int req, void *addr, int data)
   44 {
   45         char *savefpu;
   46         int error;
   47 
   48         if (!use_xsave)
   49                 return (EOPNOTSUPP);
   50 
   51         switch (req) {
   52         case PT_GETXSTATE:
   53                 savefpu = (char *)(get_pcb_user_save_td(td) + 1);
   54                 error = copyout(savefpu, addr,
   55                     cpu_max_ext_state_size - sizeof(struct savefpu));
   56                 break;
   57 
   58         case PT_SETXSTATE:
   59                 if (data > cpu_max_ext_state_size - sizeof(struct savefpu)) {
   60                         error = EINVAL;
   61                         break;
   62                 }
   63                 savefpu = malloc(data, M_TEMP, M_WAITOK);
   64                 error = copyin(addr, savefpu, data);
   65                 if (error == 0)
   66                         error = fpusetxstate(td, savefpu, data);
   67                 free(savefpu, M_TEMP);
   68                 break;
   69 
   70         default:
   71                 error = EINVAL;
   72                 break;
   73         }
   74 
   75         return (error);
   76 }
   77 
   78 #ifdef COMPAT_FREEBSD32
   79 #define PT_I386_GETXMMREGS      (PT_FIRSTMACH + 0)
   80 #define PT_I386_SETXMMREGS      (PT_FIRSTMACH + 1)
   81 #define PT_I386_GETXSTATE       (PT_FIRSTMACH + 2)
   82 #define PT_I386_SETXSTATE       (PT_FIRSTMACH + 3)
   83 
   84 static int
   85 cpu32_ptrace(struct thread *td, int req, void *addr, int data)
   86 {
   87         struct savefpu *fpstate;
   88         int error;
   89 
   90         switch (req) {
   91         case PT_I386_GETXMMREGS:
   92                 error = copyout(get_pcb_user_save_td(td), addr,
   93                     sizeof(*fpstate));
   94                 break;
   95 
   96         case PT_I386_SETXMMREGS:
   97                 fpstate = get_pcb_user_save_td(td);
   98                 error = copyin(addr, fpstate, sizeof(*fpstate));
   99                 fpstate->sv_env.en_mxcsr &= cpu_mxcsr_mask;
  100                 break;
  101 
  102         case PT_I386_GETXSTATE:
  103                 error = cpu_ptrace_xstate(td, PT_GETXSTATE, addr, data);
  104                 break;
  105 
  106         case PT_I386_SETXSTATE:
  107                 error = cpu_ptrace_xstate(td, PT_SETXSTATE, addr, data);
  108                 break;
  109 
  110         default:
  111                 error = EINVAL;
  112                 break;
  113         }
  114 
  115         return (error);
  116 }
  117 #endif
  118 
  119 int
  120 cpu_ptrace(struct thread *td, int req, void *addr, int data)
  121 {
  122         int error;
  123 
  124 #ifdef COMPAT_FREEBSD32
  125         if (SV_CURPROC_FLAG(SV_ILP32))
  126                 return (cpu32_ptrace(td, req, addr, data));
  127 #endif
  128 
  129         /* Support old values of PT_GETXSTATE and PT_SETXSTATE. */
  130         if (req == PT_FIRSTMACH + 0)
  131                 req = PT_GETXSTATE;
  132         if (req == PT_FIRSTMACH + 1)
  133                 req = PT_SETXSTATE;
  134 
  135         switch (req) {
  136         case PT_GETXSTATE:
  137         case PT_SETXSTATE:
  138                 error = cpu_ptrace_xstate(td, req, addr, data);
  139                 break;
  140 
  141         default:
  142                 error = EINVAL;
  143                 break;
  144         }
  145 
  146         return (error);
  147 }

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FreeBSD/Linux Kernel Cross Reference sys/amd64/amd64/ptrace_machdep.c

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sys/amd64/amd64/ptrace_machdep.c