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: stable/10/sys/i386/i386/ptrace_machdep.c 286311 2015-08-05 08:17:10Z kib $");
   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/frame.h>
   39 #include <machine/md_var.h>
   40 #include <machine/pcb.h>
   41 
   42 #if !defined(CPU_DISABLE_SSE) && defined(I686_CPU)
   43 #define CPU_ENABLE_SSE
   44 #endif
   45 
   46 #ifdef CPU_ENABLE_SSE
   47 static int
   48 cpu_ptrace_xstate(struct thread *td, int req, void *addr, int data)
   49 {
   50         struct ptrace_xstate_info info;
   51         char *savefpu;
   52         int error;
   53 
   54         if (!use_xsave)
   55                 return (EOPNOTSUPP);
   56 
   57         switch (req) {
   58         case PT_GETXSTATE_OLD:
   59                 npxgetregs(td);
   60                 savefpu = (char *)(get_pcb_user_save_td(td) + 1);
   61                 error = copyout(savefpu, addr,
   62                     cpu_max_ext_state_size - sizeof(union savefpu));
   63                 break;
   64 
   65         case PT_SETXSTATE_OLD:
   66                 if (data > cpu_max_ext_state_size - sizeof(union savefpu)) {
   67                         error = EINVAL;
   68                         break;
   69                 }
   70                 savefpu = malloc(data, M_TEMP, M_WAITOK);
   71                 error = copyin(addr, savefpu, data);
   72                 if (error == 0) {
   73                         npxgetregs(td);
   74                         error = npxsetxstate(td, savefpu, data);
   75                 }
   76                 free(savefpu, M_TEMP);
   77                 break;
   78 
   79         case PT_GETXSTATE_INFO:
   80                 if (data != sizeof(info)) {
   81                         error  = EINVAL;
   82                         break;
   83                 }
   84                 info.xsave_len = cpu_max_ext_state_size;
   85                 info.xsave_mask = xsave_mask;
   86                 error = copyout(&info, addr, data);
   87                 break;
   88 
   89         case PT_GETXSTATE:
   90                 npxgetregs(td);
   91                 savefpu = (char *)(get_pcb_user_save_td(td));
   92                 error = copyout(savefpu, addr, cpu_max_ext_state_size);
   93                 break;
   94 
   95         case PT_SETXSTATE:
   96                 if (data < sizeof(union savefpu) ||
   97                     data > cpu_max_ext_state_size) {
   98                         error = EINVAL;
   99                         break;
  100                 }
  101                 savefpu = malloc(data, M_TEMP, M_WAITOK);
  102                 error = copyin(addr, savefpu, data);
  103                 if (error == 0)
  104                         error = npxsetregs(td, (union savefpu *)savefpu,
  105                             savefpu + sizeof(union savefpu), data -
  106                             sizeof(union savefpu));
  107                 free(savefpu, M_TEMP);
  108                 break;
  109 
  110         default:
  111                 error = EINVAL;
  112                 break;
  113         }
  114 
  115         return (error);
  116 }
  117 #endif
  118 
  119 static int
  120 cpu_ptrace_xmm(struct thread *td, int req, void *addr, int data)
  121 {
  122 #ifdef CPU_ENABLE_SSE
  123         struct savexmm *fpstate;
  124         int error;
  125 
  126         if (!cpu_fxsr)
  127                 return (EINVAL);
  128 
  129         fpstate = &get_pcb_user_save_td(td)->sv_xmm;
  130         switch (req) {
  131         case PT_GETXMMREGS:
  132                 npxgetregs(td);
  133                 error = copyout(fpstate, addr, sizeof(*fpstate));
  134                 break;
  135 
  136         case PT_SETXMMREGS:
  137                 npxgetregs(td);
  138                 error = copyin(addr, fpstate, sizeof(*fpstate));
  139                 fpstate->sv_env.en_mxcsr &= cpu_mxcsr_mask;
  140                 break;
  141 
  142         case PT_GETXSTATE_OLD:
  143         case PT_SETXSTATE_OLD:
  144         case PT_GETXSTATE_INFO:
  145         case PT_GETXSTATE:
  146         case PT_SETXSTATE:
  147                 error = cpu_ptrace_xstate(td, req, addr, data);
  148                 break;
  149 
  150         default:
  151                 return (EINVAL);
  152         }
  153 
  154         return (error);
  155 #else
  156         return (EINVAL);
  157 #endif
  158 }
  159 
  160 int
  161 cpu_ptrace(struct thread *td, int req, void *addr, int data)
  162 {
  163         struct segment_descriptor *sdp, sd;
  164         register_t r;
  165         int error;
  166 
  167         switch (req) {
  168         case PT_GETXMMREGS:
  169         case PT_SETXMMREGS:
  170         case PT_GETXSTATE_OLD:
  171         case PT_SETXSTATE_OLD:
  172         case PT_GETXSTATE_INFO:
  173         case PT_GETXSTATE:
  174         case PT_SETXSTATE:
  175                 error = cpu_ptrace_xmm(td, req, addr, data);
  176                 break;
  177 
  178         case PT_GETFSBASE:
  179         case PT_GETGSBASE:
  180                 sdp = req == PT_GETFSBASE ? &td->td_pcb->pcb_fsd :
  181                     &td->td_pcb->pcb_gsd;
  182                 r = sdp->sd_hibase << 24 | sdp->sd_lobase;
  183                 error = copyout(&r, addr, sizeof(r));
  184                 break;
  185 
  186         case PT_SETFSBASE:
  187         case PT_SETGSBASE:
  188                 error = copyin(addr, &r, sizeof(r));
  189                 if (error != 0)
  190                         break;
  191                 fill_based_sd(&sd, r);
  192                 if (req == PT_SETFSBASE) {
  193                         td->td_pcb->pcb_fsd = sd;
  194                         td->td_frame->tf_fs = GSEL(GUFS_SEL, SEL_UPL);
  195                 } else {
  196                         td->td_pcb->pcb_gsd = sd;
  197                         td->td_pcb->pcb_gs = GSEL(GUGS_SEL, SEL_UPL);
  198                 }
  199                 break;
  200 
  201         default:
  202                 return (EINVAL);
  203         }
  204 
  205         return (error);
  206 }

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