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/lock.h>
   38 #include <sys/malloc.h>
   39 #include <sys/mutex.h>
   40 #include <sys/proc.h>
   41 #include <sys/ptrace.h>
   42 #include <machine/frame.h>
   43 #include <machine/md_var.h>
   44 #include <machine/pcb.h>
   45 
   46 static int
   47 cpu_ptrace_xstate(struct thread *td, int req, void *addr, int data)
   48 {
   49         struct ptrace_xstate_info info;
   50         char *savefpu;
   51         int error;
   52 
   53         if (!use_xsave)
   54                 return (EOPNOTSUPP);
   55 
   56         switch (req) {
   57         case PT_GETXSTATE_OLD:
   58                 npxgetregs(td);
   59                 savefpu = (char *)(get_pcb_user_save_td(td) + 1);
   60                 error = copyout(savefpu, addr,
   61                     cpu_max_ext_state_size - sizeof(union savefpu));
   62                 break;
   63 
   64         case PT_SETXSTATE_OLD:
   65                 if (data > cpu_max_ext_state_size - sizeof(union savefpu)) {
   66                         error = EINVAL;
   67                         break;
   68                 }
   69                 savefpu = malloc(data, M_TEMP, M_WAITOK);
   70                 error = copyin(addr, savefpu, data);
   71                 if (error == 0) {
   72                         npxgetregs(td);
   73                         error = npxsetxstate(td, savefpu, data);
   74                 }
   75                 free(savefpu, M_TEMP);
   76                 break;
   77 
   78         case PT_GETXSTATE_INFO:
   79                 if (data != sizeof(info)) {
   80                         error  = EINVAL;
   81                         break;
   82                 }
   83                 info.xsave_len = cpu_max_ext_state_size;
   84                 info.xsave_mask = xsave_mask;
   85                 error = copyout(&info, addr, data);
   86                 break;
   87 
   88         case PT_GETXSTATE:
   89                 npxgetregs(td);
   90                 savefpu = (char *)(get_pcb_user_save_td(td));
   91                 error = copyout(savefpu, addr, cpu_max_ext_state_size);
   92                 break;
   93 
   94         case PT_SETXSTATE:
   95                 if (data < sizeof(union savefpu) ||
   96                     data > cpu_max_ext_state_size) {
   97                         error = EINVAL;
   98                         break;
   99                 }
  100                 savefpu = malloc(data, M_TEMP, M_WAITOK);
  101                 error = copyin(addr, savefpu, data);
  102                 if (error == 0)
  103                         error = npxsetregs(td, (union savefpu *)savefpu,
  104                             savefpu + sizeof(union savefpu), data -
  105                             sizeof(union savefpu));
  106                 free(savefpu, M_TEMP);
  107                 break;
  108 
  109         default:
  110                 error = EINVAL;
  111                 break;
  112         }
  113 
  114         return (error);
  115 }
  116 
  117 static int
  118 cpu_ptrace_xmm(struct thread *td, int req, void *addr, int data)
  119 {
  120         struct savexmm *fpstate;
  121         int error;
  122 
  123         if (!cpu_fxsr)
  124                 return (EINVAL);
  125 
  126         fpstate = &get_pcb_user_save_td(td)->sv_xmm;
  127         switch (req) {
  128         case PT_GETXMMREGS:
  129                 npxgetregs(td);
  130                 error = copyout(fpstate, addr, sizeof(*fpstate));
  131                 break;
  132 
  133         case PT_SETXMMREGS:
  134                 npxgetregs(td);
  135                 error = copyin(addr, fpstate, sizeof(*fpstate));
  136                 fpstate->sv_env.en_mxcsr &= cpu_mxcsr_mask;
  137                 break;
  138 
  139         case PT_GETXSTATE_OLD:
  140         case PT_SETXSTATE_OLD:
  141         case PT_GETXSTATE_INFO:
  142         case PT_GETXSTATE:
  143         case PT_SETXSTATE:
  144                 error = cpu_ptrace_xstate(td, req, addr, data);
  145                 break;
  146 
  147         default:
  148                 return (EINVAL);
  149         }
  150 
  151         return (error);
  152 }
  153 
  154 int
  155 cpu_ptrace(struct thread *td, int req, void *addr, int data)
  156 {
  157         struct segment_descriptor *sdp, sd;
  158         register_t r;
  159         int error;
  160 
  161         switch (req) {
  162         case PT_GETXMMREGS:
  163         case PT_SETXMMREGS:
  164         case PT_GETXSTATE_OLD:
  165         case PT_SETXSTATE_OLD:
  166         case PT_GETXSTATE_INFO:
  167         case PT_GETXSTATE:
  168         case PT_SETXSTATE:
  169                 error = cpu_ptrace_xmm(td, req, addr, data);
  170                 break;
  171 
  172         case PT_GETFSBASE:
  173         case PT_GETGSBASE:
  174                 sdp = req == PT_GETFSBASE ? &td->td_pcb->pcb_fsd :
  175                     &td->td_pcb->pcb_gsd;
  176                 r = sdp->sd_hibase << 24 | sdp->sd_lobase;
  177                 error = copyout(&r, addr, sizeof(r));
  178                 break;
  179 
  180         case PT_SETFSBASE:
  181         case PT_SETGSBASE:
  182                 error = copyin(addr, &r, sizeof(r));
  183                 if (error != 0)
  184                         break;
  185                 fill_based_sd(&sd, r);
  186                 if (req == PT_SETFSBASE) {
  187                         td->td_pcb->pcb_fsd = sd;
  188                         td->td_frame->tf_fs = GSEL(GUFS_SEL, SEL_UPL);
  189                 } else {
  190                         td->td_pcb->pcb_gsd = sd;
  191                         td->td_pcb->pcb_gs = GSEL(GUGS_SEL, SEL_UPL);
  192                 }
  193                 break;
  194 
  195         default:
  196                 return (EINVAL);
  197         }
  198 
  199         return (error);
  200 }
  201 
  202 int
  203 ptrace_set_pc(struct thread *td, u_long addr)
  204 {
  205 
  206         td->td_frame->tf_eip = addr;
  207         return (0);
  208 }
  209 
  210 int
  211 ptrace_single_step(struct thread *td)
  212 {
  213 
  214         PROC_LOCK_ASSERT(td->td_proc, MA_OWNED);
  215         if ((td->td_frame->tf_eflags & PSL_T) == 0) {
  216                 td->td_frame->tf_eflags |= PSL_T;
  217                 td->td_dbgflags |= TDB_STEP;
  218         }
  219         return (0);
  220 }
  221 
  222 int
  223 ptrace_clear_single_step(struct thread *td)
  224 {
  225 
  226         PROC_LOCK_ASSERT(td->td_proc, MA_OWNED);
  227         td->td_frame->tf_eflags &= ~PSL_T;
  228         td->td_dbgflags &= ~TDB_STEP;
  229         return (0);
  230 }

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FreeBSD/Linux Kernel Cross Reference sys/i386/i386/ptrace_machdep.c

FreeBSD/Linux Kernel Cross Reference
sys/i386/i386/ptrace_machdep.c