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/9.2/sys/amd64/amd64/ptrace_machdep.c 239947 2012-08-31 12:04:29Z kib $");
   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                 fpugetregs(td);
   54                 savefpu = (char *)(get_pcb_user_save_td(td) + 1);
   55                 error = copyout(savefpu, addr,
   56                     cpu_max_ext_state_size - sizeof(struct savefpu));
   57                 break;
   58 
   59         case PT_SETXSTATE:
   60                 if (data > cpu_max_ext_state_size - sizeof(struct savefpu)) {
   61                         error = EINVAL;
   62                         break;
   63                 }
   64                 savefpu = malloc(data, M_TEMP, M_WAITOK);
   65                 error = copyin(addr, savefpu, data);
   66                 if (error == 0) {
   67                         fpugetregs(td);
   68                         error = fpusetxstate(td, savefpu, data);
   69                 }
   70                 free(savefpu, M_TEMP);
   71                 break;
   72 
   73         default:
   74                 error = EINVAL;
   75                 break;
   76         }
   77 
   78         return (error);
   79 }
   80 
   81 #ifdef COMPAT_FREEBSD32
   82 #define PT_I386_GETXMMREGS      (PT_FIRSTMACH + 0)
   83 #define PT_I386_SETXMMREGS      (PT_FIRSTMACH + 1)
   84 #define PT_I386_GETXSTATE       (PT_FIRSTMACH + 2)
   85 #define PT_I386_SETXSTATE       (PT_FIRSTMACH + 3)
   86 
   87 static int
   88 cpu32_ptrace(struct thread *td, int req, void *addr, int data)
   89 {
   90         struct savefpu *fpstate;
   91         int error;
   92 
   93         switch (req) {
   94         case PT_I386_GETXMMREGS:
   95                 fpugetregs(td);
   96                 error = copyout(get_pcb_user_save_td(td), addr,
   97                     sizeof(*fpstate));
   98                 break;
   99 
  100         case PT_I386_SETXMMREGS:
  101                 fpugetregs(td);
  102                 fpstate = get_pcb_user_save_td(td);
  103                 error = copyin(addr, fpstate, sizeof(*fpstate));
  104                 fpstate->sv_env.en_mxcsr &= cpu_mxcsr_mask;
  105                 break;
  106 
  107         case PT_I386_GETXSTATE:
  108                 error = cpu_ptrace_xstate(td, PT_GETXSTATE, addr, data);
  109                 break;
  110 
  111         case PT_I386_SETXSTATE:
  112                 error = cpu_ptrace_xstate(td, PT_SETXSTATE, addr, data);
  113                 break;
  114 
  115         default:
  116                 error = EINVAL;
  117                 break;
  118         }
  119 
  120         return (error);
  121 }
  122 #endif
  123 
  124 int
  125 cpu_ptrace(struct thread *td, int req, void *addr, int data)
  126 {
  127         int error;
  128 
  129 #ifdef COMPAT_FREEBSD32
  130         if (SV_CURPROC_FLAG(SV_ILP32))
  131                 return (cpu32_ptrace(td, req, addr, data));
  132 #endif
  133 
  134         /* Support old values of PT_GETXSTATE and PT_SETXSTATE. */
  135         if (req == PT_FIRSTMACH + 0)
  136                 req = PT_GETXSTATE;
  137         if (req == PT_FIRSTMACH + 1)
  138                 req = PT_SETXSTATE;
  139 
  140         switch (req) {
  141         case PT_GETXSTATE:
  142         case PT_SETXSTATE:
  143                 error = cpu_ptrace_xstate(td, req, addr, data);
  144                 break;
  145 
  146         default:
  147                 error = EINVAL;
  148                 break;
  149         }
  150 
  151         return (error);
  152 }

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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