1 /* 2 * Copyright (c) 2010 The FreeBSD Foundation 3 * All rights reserved. 4 * 5 * This software was developed by Rui Paulo under sponsorship from the 6 * FreeBSD Foundation. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 */ 29 30 #include <sys/cdefs.h> 31 #ifdef __FBSDID 32 __FBSDID("$FreeBSD: head/lib/libproc/proc_regs.c 285003 2015-07-01 13:59:26Z br $"); 33 #else 34 __RCSID("$NetBSD: proc_regs.c,v 1.4 2015/09/25 19:09:38 christos Exp $"); 35 #endif 36 37 #include <sys/types.h> 38 #include <sys/ptrace.h> 39 40 #include <err.h> 41 #include <stdio.h> 42 #include <string.h> 43 #include <errno.h> 44 #include <sys/ucontext.h> 45 #include "_libproc.h" 46 47 int 48 proc_regget(struct proc_handle *phdl, proc_reg_t reg, unsigned long *regvalue) 49 { 50 struct reg regs; 51 52 if (phdl->status == PS_DEAD || phdl->status == PS_UNDEAD || 53 phdl->status == PS_IDLE) { 54 errno = ENOENT; 55 return (-1); 56 } 57 memset(®s, 0, sizeof(regs)); 58 if (ptrace(PT_GETREGS, proc_getpid(phdl), ®s, 0) < 0) 59 return (-1); 60 switch (reg) { 61 case REG_PC: 62 #ifdef PTRACE_REG_PC 63 *regvalue = PTRACE_REG_PC(®s); 64 #else 65 # error "Add support for your architecture" 66 #endif 67 break; 68 case REG_SP: 69 #ifdef PTRACE_REG_SP 70 *regvalue = PTRACE_REG_SP(®s); 71 #else 72 # error "Add support for your architecture" 73 #endif 74 break; 75 default: 76 DPRINTFX("ERROR: no support for reg number %d", reg); 77 return (-1); 78 } 79 80 return (0); 81 } 82 83 int 84 proc_regset(struct proc_handle *phdl, proc_reg_t reg, unsigned long regvalue) 85 { 86 struct reg regs; 87 88 if (phdl->status == PS_DEAD || phdl->status == PS_UNDEAD || 89 phdl->status == PS_IDLE) { 90 errno = ENOENT; 91 return (-1); 92 } 93 if (ptrace(PT_GETREGS, proc_getpid(phdl), ®s, 0) < 0) 94 return (-1); 95 switch (reg) { 96 case REG_PC: 97 #ifdef PTRACE_REG_SET_PC 98 PTRACE_REG_SET_PC(®s, regvalue); 99 #else 100 # error "Add support for your architecture" 101 #endif 102 break; 103 case REG_SP: 104 #ifdef PTRACE_REG_SP 105 PTRACE_REG_SP(®s) = regvalue; 106 #else 107 # error "Add support for your architecture" 108 #endif 109 break; 110 default: 111 DPRINTFX("ERROR: no support for reg number %d", reg); 112 return (-1); 113 } 114 if (ptrace(PT_SETREGS, proc_getpid(phdl), ®s, 0) < 0) 115 return (-1); 116 117 return (0); 118 } 119