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  * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
    3  *
    4  * Copyright (c) 2005 Doug Rabson
    5  * All rights reserved.
    6  *
    7  * Redistribution and use in source and binary forms, with or without
    8  * modification, are permitted provided that the following conditions
    9  * are met:
   10  * 1. Redistributions of source code must retain the above copyright
   11  *    notice, this list of conditions and the following disclaimer.
   12  * 2. Redistributions in binary form must reproduce the above copyright
   13  *    notice, this list of conditions and the following disclaimer in the
   14  *    documentation and/or other materials provided with the distribution.
   15  *
   16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   17  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   18  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   19  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   20  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   21  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   22  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   23  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   24  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   25  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   26  * SUCH DAMAGE.
   27  *
   28  */
   29 
   30 #include <sys/cdefs.h>
   31 __FBSDID("$FreeBSD$");
   32 
   33 #include "opt_cpu.h"
   34 
   35 #include <sys/param.h>
   36 #include <sys/systm.h>
   37 #include <sys/malloc.h>
   38 #include <sys/proc.h>
   39 #include <sys/ptrace.h>
   40 #include <machine/frame.h>
   41 #include <machine/md_var.h>
   42 #include <machine/pcb.h>
   43 
   44 static int
   45 cpu_ptrace_xstate(struct thread *td, int req, void *addr, int data)
   46 {
   47         struct ptrace_xstate_info info;
   48         char *savefpu;
   49         int error;
   50 
   51         if (!use_xsave)
   52                 return (EOPNOTSUPP);
   53 
   54         switch (req) {
   55         case PT_GETXSTATE_OLD:
   56                 npxgetregs(td);
   57                 savefpu = (char *)(get_pcb_user_save_td(td) + 1);
   58                 error = copyout(savefpu, addr,
   59                     cpu_max_ext_state_size - sizeof(union savefpu));
   60                 break;
   61 
   62         case PT_SETXSTATE_OLD:
   63                 if (data > cpu_max_ext_state_size - sizeof(union savefpu)) {
   64                         error = EINVAL;
   65                         break;
   66                 }
   67                 savefpu = malloc(data, M_TEMP, M_WAITOK);
   68                 error = copyin(addr, savefpu, data);
   69                 if (error == 0) {
   70                         npxgetregs(td);
   71                         error = npxsetxstate(td, savefpu, data);
   72                 }
   73                 free(savefpu, M_TEMP);
   74                 break;
   75 
   76         case PT_GETXSTATE_INFO:
   77                 if (data != sizeof(info)) {
   78                         error  = EINVAL;
   79                         break;
   80                 }
   81                 info.xsave_len = cpu_max_ext_state_size;
   82                 info.xsave_mask = xsave_mask;
   83                 error = copyout(&info, addr, data);
   84                 break;
   85 
   86         case PT_GETXSTATE:
   87                 npxgetregs(td);
   88                 savefpu = (char *)(get_pcb_user_save_td(td));
   89                 error = copyout(savefpu, addr, cpu_max_ext_state_size);
   90                 break;
   91 
   92         case PT_SETXSTATE:
   93                 if (data < sizeof(union savefpu) ||
   94                     data > cpu_max_ext_state_size) {
   95                         error = EINVAL;
   96                         break;
   97                 }
   98                 savefpu = malloc(data, M_TEMP, M_WAITOK);
   99                 error = copyin(addr, savefpu, data);
  100                 if (error == 0)
  101                         error = npxsetregs(td, (union savefpu *)savefpu,
  102                             savefpu + sizeof(union savefpu), data -
  103                             sizeof(union savefpu));
  104                 free(savefpu, M_TEMP);
  105                 break;
  106 
  107         default:
  108                 error = EINVAL;
  109                 break;
  110         }
  111 
  112         return (error);
  113 }
  114 
  115 static int
  116 cpu_ptrace_xmm(struct thread *td, int req, void *addr, int data)
  117 {
  118         struct savexmm *fpstate;
  119         int error;
  120 
  121         if (!cpu_fxsr)
  122                 return (EINVAL);
  123 
  124         fpstate = &get_pcb_user_save_td(td)->sv_xmm;
  125         switch (req) {
  126         case PT_GETXMMREGS:
  127                 npxgetregs(td);
  128                 error = copyout(fpstate, addr, sizeof(*fpstate));
  129                 break;
  130 
  131         case PT_SETXMMREGS:
  132                 npxgetregs(td);
  133                 error = copyin(addr, fpstate, sizeof(*fpstate));
  134                 fpstate->sv_env.en_mxcsr &= cpu_mxcsr_mask;
  135                 break;
  136 
  137         case PT_GETXSTATE_OLD:
  138         case PT_SETXSTATE_OLD:
  139         case PT_GETXSTATE_INFO:
  140         case PT_GETXSTATE:
  141         case PT_SETXSTATE:
  142                 error = cpu_ptrace_xstate(td, req, addr, data);
  143                 break;
  144 
  145         default:
  146                 return (EINVAL);
  147         }
  148 
  149         return (error);
  150 }
  151 
  152 int
  153 cpu_ptrace(struct thread *td, int req, void *addr, int data)
  154 {
  155         struct segment_descriptor *sdp, sd;
  156         register_t r;
  157         int error;
  158 
  159         switch (req) {
  160         case PT_GETXMMREGS:
  161         case PT_SETXMMREGS:
  162         case PT_GETXSTATE_OLD:
  163         case PT_SETXSTATE_OLD:
  164         case PT_GETXSTATE_INFO:
  165         case PT_GETXSTATE:
  166         case PT_SETXSTATE:
  167                 error = cpu_ptrace_xmm(td, req, addr, data);
  168                 break;
  169 
  170         case PT_GETFSBASE:
  171         case PT_GETGSBASE:
  172                 sdp = req == PT_GETFSBASE ? &td->td_pcb->pcb_fsd :
  173                     &td->td_pcb->pcb_gsd;
  174                 r = sdp->sd_hibase << 24 | sdp->sd_lobase;
  175                 error = copyout(&r, addr, sizeof(r));
  176                 break;
  177 
  178         case PT_SETFSBASE:
  179         case PT_SETGSBASE:
  180                 error = copyin(addr, &r, sizeof(r));
  181                 if (error != 0)
  182                         break;
  183                 fill_based_sd(&sd, r);
  184                 if (req == PT_SETFSBASE) {
  185                         td->td_pcb->pcb_fsd = sd;
  186                         td->td_frame->tf_fs = GSEL(GUFS_SEL, SEL_UPL);
  187                 } else {
  188                         td->td_pcb->pcb_gsd = sd;
  189                         td->td_pcb->pcb_gs = GSEL(GUGS_SEL, SEL_UPL);
  190                 }
  191                 break;
  192 
  193         default:
  194                 return (EINVAL);
  195         }
  196 
  197         return (error);
  198 }

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