ptrace_machdep.c revision 276084
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: stable/10/sys/i386/i386/ptrace_machdep.c 276084 2014-12-22 21:32:39Z jhb $"); 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/md_var.h> 39#include <machine/pcb.h> 40 41#if !defined(CPU_DISABLE_SSE) && defined(I686_CPU) 42#define CPU_ENABLE_SSE 43#endif 44 45#ifdef CPU_ENABLE_SSE 46static int 47cpu_ptrace_xstate(struct thread *td, int req, void *addr, int data) 48{ 49 char *savefpu; 50 int error; 51 52 if (!use_xsave) 53 return (EOPNOTSUPP); 54 55 switch (req) { 56 case PT_GETXSTATE: 57 npxgetregs(td); 58 savefpu = (char *)(get_pcb_user_save_td(td) + 1); 59 error = copyout(savefpu, addr, 60 cpu_max_ext_state_size - sizeof(union savefpu)); 61 break; 62 63 case PT_SETXSTATE: 64 if (data > cpu_max_ext_state_size - sizeof(union savefpu)) { 65 error = EINVAL; 66 break; 67 } 68 savefpu = malloc(data, M_TEMP, M_WAITOK); 69 error = copyin(addr, savefpu, data); 70 if (error == 0) { 71 npxgetregs(td); 72 error = npxsetxstate(td, savefpu, data); 73 } 74 free(savefpu, M_TEMP); 75 break; 76 77 default: 78 error = EINVAL; 79 break; 80 } 81 82 return (error); 83} 84#endif 85 86int 87cpu_ptrace(struct thread *td, int req, void *addr, int data) 88{ 89#ifdef CPU_ENABLE_SSE 90 struct savexmm *fpstate; 91 int error; 92 93 if (!cpu_fxsr) 94 return (EINVAL); 95 96 fpstate = &get_pcb_user_save_td(td)->sv_xmm; 97 switch (req) { 98 case PT_GETXMMREGS: 99 npxgetregs(td); 100 error = copyout(fpstate, addr, sizeof(*fpstate)); 101 break; 102 103 case PT_SETXMMREGS: 104 npxgetregs(td); 105 error = copyin(addr, fpstate, sizeof(*fpstate)); 106 fpstate->sv_env.en_mxcsr &= cpu_mxcsr_mask; 107 break; 108 109 case PT_GETXSTATE: 110 case PT_SETXSTATE: 111 error = cpu_ptrace_xstate(td, req, addr, data); 112 break; 113 114 default: 115 return (EINVAL); 116 } 117 118 return (error); 119#else 120 return (EINVAL); 121#endif 122} 123