sys/i386/i386/ptrace_machdep.c

   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("$FreeBSD$");
  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 }