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/11.2/sys/amd64/amd64/ptrace_machdep.c 331735 2018-03-29 15:08:40Z 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 <vm/vm.h>
   40 #include <vm/pmap.h>
   41 #include <machine/md_var.h>
   42 #include <machine/pcb.h>
   43 #include <machine/frame.h>
   44 #include <machine/vmparam.h>
   45 
   46 #ifdef COMPAT_FREEBSD32
   47 struct ptrace_xstate_info32 {
   48         uint32_t        xsave_mask1, xsave_mask2;
   49         uint32_t        xsave_len;
   50 };
   51 #endif
   52 
   53 static int
   54 cpu_ptrace_xstate(struct thread *td, int req, void *addr, int data)
   55 {
   56         struct ptrace_xstate_info info;
   57 #ifdef COMPAT_FREEBSD32
   58         struct ptrace_xstate_info32 info32;
   59 #endif
   60         char *savefpu;
   61         int error;
   62 
   63         if (!use_xsave)
   64                 return (EOPNOTSUPP);
   65 
   66         switch (req) {
   67         case PT_GETXSTATE_OLD:
   68                 fpugetregs(td);
   69                 savefpu = (char *)(get_pcb_user_save_td(td) + 1);
   70                 error = copyout(savefpu, addr,
   71                     cpu_max_ext_state_size - sizeof(struct savefpu));
   72                 break;
   73 
   74         case PT_SETXSTATE_OLD:
   75                 if (data > cpu_max_ext_state_size - sizeof(struct savefpu)) {
   76                         error = EINVAL;
   77                         break;
   78                 }
   79                 savefpu = malloc(data, M_TEMP, M_WAITOK);
   80                 error = copyin(addr, savefpu, data);
   81                 if (error == 0) {
   82                         fpugetregs(td);
   83                         error = fpusetxstate(td, savefpu, data);
   84                 }
   85                 free(savefpu, M_TEMP);
   86                 break;
   87 
   88         case PT_GETXSTATE_INFO:
   89 #ifdef COMPAT_FREEBSD32
   90                 if (SV_CURPROC_FLAG(SV_ILP32)) {
   91                         if (data != sizeof(info32)) {
   92                                 error = EINVAL;
   93                         } else {
   94                                 info32.xsave_len = cpu_max_ext_state_size;
   95                                 info32.xsave_mask1 = xsave_mask;
   96                                 info32.xsave_mask2 = xsave_mask >> 32;
   97                                 error = copyout(&info32, addr, data);
   98                         }
   99                 } else
  100 #endif
  101                 {
  102                         if (data != sizeof(info)) {
  103                                 error  = EINVAL;
  104                         } else {
  105                                 bzero(&info, sizeof(info));
  106                                 info.xsave_len = cpu_max_ext_state_size;
  107                                 info.xsave_mask = xsave_mask;
  108                                 error = copyout(&info, addr, data);
  109                         }
  110                 }
  111                 break;
  112 
  113         case PT_GETXSTATE:
  114                 fpugetregs(td);
  115                 savefpu = (char *)(get_pcb_user_save_td(td));
  116                 error = copyout(savefpu, addr, cpu_max_ext_state_size);
  117                 break;
  118 
  119         case PT_SETXSTATE:
  120                 if (data < sizeof(struct savefpu) ||
  121                     data > cpu_max_ext_state_size) {
  122                         error = EINVAL;
  123                         break;
  124                 }
  125                 savefpu = malloc(data, M_TEMP, M_WAITOK);
  126                 error = copyin(addr, savefpu, data);
  127                 if (error == 0)
  128                         error = fpusetregs(td, (struct savefpu *)savefpu,
  129                             savefpu + sizeof(struct savefpu), data -
  130                             sizeof(struct savefpu));
  131                 free(savefpu, M_TEMP);
  132                 break;
  133 
  134         default:
  135                 error = EINVAL;
  136                 break;
  137         }
  138 
  139         return (error);
  140 }
  141 
  142 static void
  143 cpu_ptrace_setbase(struct thread *td, int req, register_t r)
  144 {
  145         struct pcb *pcb;
  146 
  147         pcb = td->td_pcb;
  148         set_pcb_flags(pcb, PCB_FULL_IRET);
  149         if (req == PT_SETFSBASE) {
  150                 pcb->pcb_fsbase = r;
  151                 td->td_frame->tf_fs = _ufssel;
  152         } else {
  153                 pcb->pcb_gsbase = r;
  154                 td->td_frame->tf_gs = _ugssel;
  155         }
  156 }
  157 
  158 #ifdef COMPAT_FREEBSD32
  159 #define PT_I386_GETXMMREGS      (PT_FIRSTMACH + 0)
  160 #define PT_I386_SETXMMREGS      (PT_FIRSTMACH + 1)
  161 
  162 static int
  163 cpu32_ptrace(struct thread *td, int req, void *addr, int data)
  164 {
  165         struct savefpu *fpstate;
  166         struct pcb *pcb;
  167         uint32_t r;
  168         int error;
  169 
  170         switch (req) {
  171         case PT_I386_GETXMMREGS:
  172                 fpugetregs(td);
  173                 error = copyout(get_pcb_user_save_td(td), addr,
  174                     sizeof(*fpstate));
  175                 break;
  176 
  177         case PT_I386_SETXMMREGS:
  178                 fpugetregs(td);
  179                 fpstate = get_pcb_user_save_td(td);
  180                 error = copyin(addr, fpstate, sizeof(*fpstate));
  181                 fpstate->sv_env.en_mxcsr &= cpu_mxcsr_mask;
  182                 break;
  183 
  184         case PT_GETXSTATE_OLD:
  185         case PT_SETXSTATE_OLD:
  186         case PT_GETXSTATE_INFO:
  187         case PT_GETXSTATE:
  188         case PT_SETXSTATE:
  189                 error = cpu_ptrace_xstate(td, req, addr, data);
  190                 break;
  191 
  192         case PT_GETFSBASE:
  193         case PT_GETGSBASE:
  194                 if (!SV_PROC_FLAG(td->td_proc, SV_ILP32)) {
  195                         error = EINVAL;
  196                         break;
  197                 }
  198                 pcb = td->td_pcb;
  199                 if (td == curthread)
  200                         update_pcb_bases(pcb);
  201                 r = req == PT_GETFSBASE ? pcb->pcb_fsbase : pcb->pcb_gsbase;
  202                 error = copyout(&r, addr, sizeof(r));
  203                 break;
  204 
  205         case PT_SETFSBASE:
  206         case PT_SETGSBASE:
  207                 if (!SV_PROC_FLAG(td->td_proc, SV_ILP32)) {
  208                         error = EINVAL;
  209                         break;
  210                 }
  211                 error = copyin(addr, &r, sizeof(r));
  212                 if (error != 0)
  213                         break;
  214                 cpu_ptrace_setbase(td, req, r);
  215                 break;
  216 
  217         default:
  218                 error = EINVAL;
  219                 break;
  220         }
  221 
  222         return (error);
  223 }
  224 #endif
  225 
  226 int
  227 cpu_ptrace(struct thread *td, int req, void *addr, int data)
  228 {
  229         register_t *r, rv;
  230         struct pcb *pcb;
  231         int error;
  232 
  233 #ifdef COMPAT_FREEBSD32
  234         if (SV_CURPROC_FLAG(SV_ILP32))
  235                 return (cpu32_ptrace(td, req, addr, data));
  236 #endif
  237 
  238         /* Support old values of PT_GETXSTATE_OLD and PT_SETXSTATE_OLD. */
  239         if (req == PT_FIRSTMACH + 0)
  240                 req = PT_GETXSTATE_OLD;
  241         if (req == PT_FIRSTMACH + 1)
  242                 req = PT_SETXSTATE_OLD;
  243 
  244         switch (req) {
  245         case PT_GETXSTATE_OLD:
  246         case PT_SETXSTATE_OLD:
  247         case PT_GETXSTATE_INFO:
  248         case PT_GETXSTATE:
  249         case PT_SETXSTATE:
  250                 error = cpu_ptrace_xstate(td, req, addr, data);
  251                 break;
  252 
  253         case PT_GETFSBASE:
  254         case PT_GETGSBASE:
  255                 pcb = td->td_pcb;
  256                 if (td == curthread)
  257                         update_pcb_bases(pcb);
  258                 r = req == PT_GETFSBASE ? &pcb->pcb_fsbase : &pcb->pcb_gsbase;
  259                 error = copyout(r, addr, sizeof(*r));
  260                 break;
  261 
  262         case PT_SETFSBASE:
  263         case PT_SETGSBASE:
  264                 error = copyin(addr, &rv, sizeof(rv));
  265                 if (error != 0)
  266                         break;
  267                 if (rv >= td->td_proc->p_sysent->sv_maxuser) {
  268                         error = EINVAL;
  269                         break;
  270                 }
  271                 cpu_ptrace_setbase(td, req, rv);
  272                 break;
  273 
  274         default:
  275                 error = EINVAL;
  276                 break;
  277         }
  278 
  279         return (error);
  280 }

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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