ptrace_machdep.c revision 274817
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 274817 2014-11-21 20:53:17Z jhb $"); 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 <machine/md_var.h> 40#include <machine/pcb.h> 41 42static int 43cpu_ptrace_xstate(struct thread *td, int req, void *addr, int data) 44{ 45 struct ptrace_xstate_info info; 46 char *savefpu; 47 int error; 48 49 if (!use_xsave) 50 return (EOPNOTSUPP); 51 52 switch (req) { 53 case PT_GETXSTATE_OLD: 54 fpugetregs(td); 55 savefpu = (char *)(get_pcb_user_save_td(td) + 1); 56 error = copyout(savefpu, addr, 57 cpu_max_ext_state_size - sizeof(struct savefpu)); 58 break; 59 60 case PT_SETXSTATE_OLD: 61 if (data > cpu_max_ext_state_size - sizeof(struct savefpu)) { 62 error = EINVAL; 63 break; 64 } 65 savefpu = malloc(data, M_TEMP, M_WAITOK); 66 error = copyin(addr, savefpu, data); 67 if (error == 0) { 68 fpugetregs(td); 69 error = fpusetxstate(td, savefpu, data); 70 } 71 free(savefpu, M_TEMP); 72 break; 73 74 case PT_GETXSTATE_INFO: 75 if (data != sizeof(info)) { 76 error = EINVAL; 77 break; 78 } 79 info.xsave_len = cpu_max_ext_state_size; 80 info.xsave_mask = xsave_mask; 81 error = copyout(&info, addr, data); 82 break; 83 84 case PT_GETXSTATE: 85 fpugetregs(td); 86 savefpu = (char *)(get_pcb_user_save_td(td)); 87 error = copyout(savefpu, addr, cpu_max_ext_state_size); 88 break; 89 90 case PT_SETXSTATE: 91 if (data > cpu_max_ext_state_size) { 92 error = EINVAL; 93 break; 94 } 95 savefpu = malloc(data, M_TEMP, M_WAITOK); 96 error = copyin(addr, savefpu, data); 97 if (error == 0) 98 error = fpusetregs(td, (struct savefpu *)savefpu, 99 savefpu + sizeof(struct savefpu), data - 100 sizeof(struct savefpu)); 101 free(savefpu, M_TEMP); 102 break; 103 104 default: 105 error = EINVAL; 106 break; 107 } 108 109 return (error); 110} 111 112#ifdef COMPAT_FREEBSD32 113#define PT_I386_GETXMMREGS (PT_FIRSTMACH + 0) 114#define PT_I386_SETXMMREGS (PT_FIRSTMACH + 1) 115 116static int 117cpu32_ptrace(struct thread *td, int req, void *addr, int data) 118{ 119 struct savefpu *fpstate; 120 int error; 121 122 switch (req) { 123 case PT_I386_GETXMMREGS: 124 fpugetregs(td); 125 error = copyout(get_pcb_user_save_td(td), addr, 126 sizeof(*fpstate)); 127 break; 128 129 case PT_I386_SETXMMREGS: 130 fpugetregs(td); 131 fpstate = get_pcb_user_save_td(td); 132 error = copyin(addr, fpstate, sizeof(*fpstate)); 133 fpstate->sv_env.en_mxcsr &= cpu_mxcsr_mask; 134 break; 135 136 case PT_GETXSTATE_OLD: 137 case PT_SETXSTATE_OLD: 138 case PT_GETXSTATE_INFO: 139 case PT_GETXSTATE: 140 case PT_SETXSTATE: 141 error = cpu_ptrace_xstate(td, req, addr, data); 142 break; 143 144 default: 145 error = EINVAL; 146 break; 147 } 148 149 return (error); 150} 151#endif 152 153int 154cpu_ptrace(struct thread *td, int req, void *addr, int data) 155{ 156 int error; 157 158#ifdef COMPAT_FREEBSD32 159 if (SV_CURPROC_FLAG(SV_ILP32)) 160 return (cpu32_ptrace(td, req, addr, data)); 161#endif 162 163 /* Support old values of PT_GETXSTATE_OLD and PT_SETXSTATE_OLD. */ 164 if (req == PT_FIRSTMACH + 0) 165 req = PT_GETXSTATE_OLD; 166 if (req == PT_FIRSTMACH + 1) 167 req = PT_SETXSTATE_OLD; 168 169 switch (req) { 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_xstate(td, req, addr, data); 176 break; 177 178 default: 179 error = EINVAL; 180 break; 181 } 182 183 return (error); 184} 185