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/elf.h>
   38 #include <sys/lock.h>
   39 #include <sys/malloc.h>
   40 #include <sys/mutex.h>
   41 #include <sys/proc.h>
   42 #include <sys/ptrace.h>
   43 #include <sys/reg.h>
   44 #include <machine/frame.h>
   45 #include <machine/md_var.h>
   46 #include <machine/pcb.h>
   47 
   48 static uint32_t
   49 get_segbase(struct segment_descriptor *sdp)
   50 {
   51         return (sdp->sd_hibase << 24 | sdp->sd_lobase);
   52 }
   53 
   54 static bool
   55 get_segbases(struct regset *rs, struct thread *td, void *buf,
   56     size_t *sizep)
   57 {
   58         struct segbasereg *reg;
   59 
   60         if (buf != NULL) {
   61                 KASSERT(*sizep == sizeof(*reg), ("%s: invalid size", __func__));
   62                 reg = buf;
   63                 reg->r_fsbase = get_segbase(&td->td_pcb->pcb_fsd);
   64                 reg->r_gsbase = get_segbase(&td->td_pcb->pcb_gsd);
   65         }
   66         *sizep = sizeof(*reg);
   67         return (true);
   68 }
   69 
   70 static bool
   71 set_segbases(struct regset *rs, struct thread *td, void *buf,
   72     size_t size)
   73 {
   74         struct segbasereg *reg;
   75 
   76         KASSERT(size == sizeof(*reg), ("%s: invalid size", __func__));
   77         reg = buf;
   78 
   79         fill_based_sd(&td->td_pcb->pcb_fsd, reg->r_fsbase);
   80         td->td_frame->tf_fs = GSEL(GUFS_SEL, SEL_UPL);
   81         fill_based_sd(&td->td_pcb->pcb_gsd, reg->r_gsbase);
   82         td->td_pcb->pcb_gs = GSEL(GUGS_SEL, SEL_UPL);
   83 
   84         return (true);
   85 }
   86 
   87 static struct regset regset_segbases = {
   88         .note = NT_X86_SEGBASES,
   89         .size = sizeof(struct segbasereg),
   90         .get = get_segbases,
   91         .set = set_segbases,
   92 };
   93 ELF_REGSET(regset_segbases);
   94 
   95 static int
   96 cpu_ptrace_xstate(struct thread *td, int req, void *addr, int data)
   97 {
   98         struct ptrace_xstate_info info;
   99         char *savefpu;
  100         int error;
  101 
  102         if (!use_xsave)
  103                 return (EOPNOTSUPP);
  104 
  105         switch (req) {
  106         case PT_GETXSTATE_OLD:
  107                 npxgetregs(td);
  108                 savefpu = (char *)(get_pcb_user_save_td(td) + 1);
  109                 error = copyout(savefpu, addr,
  110                     cpu_max_ext_state_size - sizeof(union savefpu));
  111                 break;
  112 
  113         case PT_SETXSTATE_OLD:
  114                 if (data > cpu_max_ext_state_size - sizeof(union savefpu)) {
  115                         error = EINVAL;
  116                         break;
  117                 }
  118                 savefpu = malloc(data, M_TEMP, M_WAITOK);
  119                 error = copyin(addr, savefpu, data);
  120                 if (error == 0) {
  121                         npxgetregs(td);
  122                         error = npxsetxstate(td, savefpu, data);
  123                 }
  124                 free(savefpu, M_TEMP);
  125                 break;
  126 
  127         case PT_GETXSTATE_INFO:
  128                 if (data != sizeof(info)) {
  129                         error  = EINVAL;
  130                         break;
  131                 }
  132                 info.xsave_len = cpu_max_ext_state_size;
  133                 info.xsave_mask = xsave_mask;
  134                 error = copyout(&info, addr, data);
  135                 break;
  136 
  137         case PT_GETXSTATE:
  138                 npxgetregs(td);
  139                 savefpu = (char *)(get_pcb_user_save_td(td));
  140                 error = copyout(savefpu, addr, cpu_max_ext_state_size);
  141                 break;
  142 
  143         case PT_SETXSTATE:
  144                 if (data < sizeof(union savefpu) ||
  145                     data > cpu_max_ext_state_size) {
  146                         error = EINVAL;
  147                         break;
  148                 }
  149                 savefpu = malloc(data, M_TEMP, M_WAITOK);
  150                 error = copyin(addr, savefpu, data);
  151                 if (error == 0)
  152                         error = npxsetregs(td, (union savefpu *)savefpu,
  153                             savefpu + sizeof(union savefpu), data -
  154                             sizeof(union savefpu));
  155                 free(savefpu, M_TEMP);
  156                 break;
  157 
  158         default:
  159                 error = EINVAL;
  160                 break;
  161         }
  162 
  163         return (error);
  164 }
  165 
  166 static int
  167 cpu_ptrace_xmm(struct thread *td, int req, void *addr, int data)
  168 {
  169         struct savexmm *fpstate;
  170         int error;
  171 
  172         if (!cpu_fxsr)
  173                 return (EINVAL);
  174 
  175         fpstate = &get_pcb_user_save_td(td)->sv_xmm;
  176         switch (req) {
  177         case PT_GETXMMREGS:
  178                 npxgetregs(td);
  179                 error = copyout(fpstate, addr, sizeof(*fpstate));
  180                 break;
  181 
  182         case PT_SETXMMREGS:
  183                 npxgetregs(td);
  184                 error = copyin(addr, fpstate, sizeof(*fpstate));
  185                 fpstate->sv_env.en_mxcsr &= cpu_mxcsr_mask;
  186                 break;
  187 
  188         case PT_GETXSTATE_OLD:
  189         case PT_SETXSTATE_OLD:
  190         case PT_GETXSTATE_INFO:
  191         case PT_GETXSTATE:
  192         case PT_SETXSTATE:
  193                 error = cpu_ptrace_xstate(td, req, addr, data);
  194                 break;
  195 
  196         default:
  197                 return (EINVAL);
  198         }
  199 
  200         return (error);
  201 }
  202 
  203 int
  204 cpu_ptrace(struct thread *td, int req, void *addr, int data)
  205 {
  206         struct segment_descriptor *sdp, sd;
  207         register_t r;
  208         int error;
  209 
  210         switch (req) {
  211         case PT_GETXMMREGS:
  212         case PT_SETXMMREGS:
  213         case PT_GETXSTATE_OLD:
  214         case PT_SETXSTATE_OLD:
  215         case PT_GETXSTATE_INFO:
  216         case PT_GETXSTATE:
  217         case PT_SETXSTATE:
  218                 error = cpu_ptrace_xmm(td, req, addr, data);
  219                 break;
  220 
  221         case PT_GETFSBASE:
  222         case PT_GETGSBASE:
  223                 sdp = req == PT_GETFSBASE ? &td->td_pcb->pcb_fsd :
  224                     &td->td_pcb->pcb_gsd;
  225                 r = get_segbase(sdp);
  226                 error = copyout(&r, addr, sizeof(r));
  227                 break;
  228 
  229         case PT_SETFSBASE:
  230         case PT_SETGSBASE:
  231                 error = copyin(addr, &r, sizeof(r));
  232                 if (error != 0)
  233                         break;
  234                 fill_based_sd(&sd, r);
  235                 if (req == PT_SETFSBASE) {
  236                         td->td_pcb->pcb_fsd = sd;
  237                         td->td_frame->tf_fs = GSEL(GUFS_SEL, SEL_UPL);
  238                 } else {
  239                         td->td_pcb->pcb_gsd = sd;
  240                         td->td_pcb->pcb_gs = GSEL(GUGS_SEL, SEL_UPL);
  241                 }
  242                 break;
  243 
  244         default:
  245                 return (EINVAL);
  246         }
  247 
  248         return (error);
  249 }
  250 
  251 int
  252 ptrace_set_pc(struct thread *td, u_long addr)
  253 {
  254 
  255         td->td_frame->tf_eip = addr;
  256         return (0);
  257 }
  258 
  259 int
  260 ptrace_single_step(struct thread *td)
  261 {
  262 
  263         PROC_LOCK_ASSERT(td->td_proc, MA_OWNED);
  264         if ((td->td_frame->tf_eflags & PSL_T) == 0) {
  265                 td->td_frame->tf_eflags |= PSL_T;
  266                 td->td_dbgflags |= TDB_STEP;
  267         }
  268         return (0);
  269 }
  270 
  271 int
  272 ptrace_clear_single_step(struct thread *td)
  273 {
  274 
  275         PROC_LOCK_ASSERT(td->td_proc, MA_OWNED);
  276         td->td_frame->tf_eflags &= ~PSL_T;
  277         td->td_dbgflags &= ~TDB_STEP;
  278         return (0);
  279 }

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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