ptrace_machdep.c revision 284919
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: head/sys/amd64/amd64/ptrace_machdep.c 284919 2015-06-29 07:07:24Z 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 46static int 47cpu_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 fpugetregs(td); 59 savefpu = (char *)(get_pcb_user_save_td(td) + 1); 60 error = copyout(savefpu, addr, 61 cpu_max_ext_state_size - sizeof(struct savefpu)); 62 break; 63 64 case PT_SETXSTATE_OLD: 65 if (data > cpu_max_ext_state_size - sizeof(struct 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 fpugetregs(td); 73 error = fpusetxstate(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 fpugetregs(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(struct 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 = fpusetregs(td, (struct savefpu *)savefpu, 104 savefpu + sizeof(struct savefpu), data - 105 sizeof(struct savefpu)); 106 free(savefpu, M_TEMP); 107 break; 108 109 default: 110 error = EINVAL; 111 break; 112 } 113 114 return (error); 115} 116 117static void 118cpu_ptrace_setbase(struct thread *td, int req, register_t r) 119{ 120 121 if (req == PT_SETFSBASE) { 122 td->td_pcb->pcb_fsbase = r; 123 td->td_frame->tf_fs = _ufssel; 124 } else { 125 td->td_pcb->pcb_gsbase = r; 126 td->td_frame->tf_gs = _ugssel; 127 } 128 set_pcb_flags(td->td_pcb, PCB_FULL_IRET); 129} 130 131#ifdef COMPAT_FREEBSD32 132#define PT_I386_GETXMMREGS (PT_FIRSTMACH + 0) 133#define PT_I386_SETXMMREGS (PT_FIRSTMACH + 1) 134 135static int 136cpu32_ptrace(struct thread *td, int req, void *addr, int data) 137{ 138 struct savefpu *fpstate; 139 uint32_t r; 140 int error; 141 142 switch (req) { 143 case PT_I386_GETXMMREGS: 144 fpugetregs(td); 145 error = copyout(get_pcb_user_save_td(td), addr, 146 sizeof(*fpstate)); 147 break; 148 149 case PT_I386_SETXMMREGS: 150 fpugetregs(td); 151 fpstate = get_pcb_user_save_td(td); 152 error = copyin(addr, fpstate, sizeof(*fpstate)); 153 fpstate->sv_env.en_mxcsr &= cpu_mxcsr_mask; 154 break; 155 156 case PT_GETXSTATE_OLD: 157 case PT_SETXSTATE_OLD: 158 case PT_GETXSTATE_INFO: 159 case PT_GETXSTATE: 160 case PT_SETXSTATE: 161 error = cpu_ptrace_xstate(td, req, addr, data); 162 break; 163 164 case PT_GETFSBASE: 165 case PT_GETGSBASE: 166 if (!SV_PROC_FLAG(td->td_proc, SV_ILP32)) { 167 error = EINVAL; 168 break; 169 } 170 r = req == PT_GETFSBASE ? td->td_pcb->pcb_fsbase : 171 td->td_pcb->pcb_gsbase; 172 error = copyout(&r, addr, sizeof(r)); 173 break; 174 175 case PT_SETFSBASE: 176 case PT_SETGSBASE: 177 if (!SV_PROC_FLAG(td->td_proc, SV_ILP32)) { 178 error = EINVAL; 179 break; 180 } 181 error = copyin(addr, &r, sizeof(r)); 182 if (error != 0) 183 break; 184 cpu_ptrace_setbase(td, req, r); 185 break; 186 187 default: 188 error = EINVAL; 189 break; 190 } 191 192 return (error); 193} 194#endif 195 196int 197cpu_ptrace(struct thread *td, int req, void *addr, int data) 198{ 199 register_t *r, rv; 200 int error; 201 202#ifdef COMPAT_FREEBSD32 203 if (SV_CURPROC_FLAG(SV_ILP32)) 204 return (cpu32_ptrace(td, req, addr, data)); 205#endif 206 207 /* Support old values of PT_GETXSTATE_OLD and PT_SETXSTATE_OLD. */ 208 if (req == PT_FIRSTMACH + 0) 209 req = PT_GETXSTATE_OLD; 210 if (req == PT_FIRSTMACH + 1) 211 req = PT_SETXSTATE_OLD; 212 213 switch (req) { 214 case PT_GETXSTATE_OLD: 215 case PT_SETXSTATE_OLD: 216 case PT_GETXSTATE_INFO: 217 case PT_GETXSTATE: 218 case PT_SETXSTATE: 219 error = cpu_ptrace_xstate(td, req, addr, data); 220 break; 221 222 case PT_GETFSBASE: 223 case PT_GETGSBASE: 224 r = req == PT_GETFSBASE ? &td->td_pcb->pcb_fsbase : 225 &td->td_pcb->pcb_gsbase; 226 error = copyout(r, addr, sizeof(*r)); 227 break; 228 229 case PT_SETFSBASE: 230 case PT_SETGSBASE: 231 error = copyin(addr, &rv, sizeof(rv)); 232 if (error != 0) 233 break; 234 if (rv >= VM_MAXUSER_ADDRESS) { 235 error = EINVAL; 236 break; 237 } 238 cpu_ptrace_setbase(td, req, rv); 239 break; 240 241 default: 242 error = EINVAL; 243 break; 244 } 245 246 return (error); 247} 248