1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause 3 * 4 * Copyright (c) 2010 The FreeBSD Foundation 5 * All rights reserved. 6 * 7 * This software was developed by Rui Paulo under sponsorship from the 8 * FreeBSD Foundation. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 */ 31 32 #include <sys/cdefs.h> 33 __FBSDID("$FreeBSD$"); 34 35 #include <sys/types.h> 36 #include <sys/ptrace.h> 37 38 #include <err.h> 39 #include <stdio.h> 40 #include <string.h> 41 #include <errno.h> 42 43 #include "_libproc.h" 44 45 int 46 proc_regget(struct proc_handle *phdl, proc_reg_t reg, unsigned long *regvalue) 47 { 48 struct reg regs; 49 50 if (phdl->status == PS_DEAD || phdl->status == PS_UNDEAD || 51 phdl->status == PS_IDLE) { 52 errno = ENOENT; 53 return (-1); 54 } 55 memset(®s, 0, sizeof(regs)); 56 if (ptrace(PT_GETREGS, proc_getpid(phdl), (caddr_t)®s, 0) < 0) 57 return (-1); 58 switch (reg) { 59 case REG_PC: 60 #if defined(__aarch64__) 61 *regvalue = regs.elr; 62 #elif defined(__amd64__) 63 *regvalue = regs.r_rip; 64 #elif defined(__arm__) 65 *regvalue = regs.r_pc; 66 #elif defined(__i386__) 67 *regvalue = regs.r_eip; 68 #elif defined(__powerpc__) 69 *regvalue = regs.pc; 70 #elif defined(__riscv) 71 *regvalue = regs.sepc; 72 #endif 73 break; 74 case REG_SP: 75 #if defined(__aarch64__) 76 *regvalue = regs.sp; 77 #elif defined(__amd64__) 78 *regvalue = regs.r_rsp; 79 #elif defined(__arm__) 80 *regvalue = regs.r_sp; 81 #elif defined(__i386__) 82 *regvalue = regs.r_esp; 83 #elif defined(__powerpc__) 84 *regvalue = regs.fixreg[1]; 85 #elif defined(__riscv) 86 *regvalue = regs.sp; 87 #endif 88 break; 89 default: 90 DPRINTFX("ERROR: no support for reg number %d", reg); 91 return (-1); 92 } 93 94 return (0); 95 } 96 97 int 98 proc_regset(struct proc_handle *phdl, proc_reg_t reg, unsigned long regvalue) 99 { 100 struct reg regs; 101 102 if (phdl->status == PS_DEAD || phdl->status == PS_UNDEAD || 103 phdl->status == PS_IDLE) { 104 errno = ENOENT; 105 return (-1); 106 } 107 if (ptrace(PT_GETREGS, proc_getpid(phdl), (caddr_t)®s, 0) < 0) 108 return (-1); 109 switch (reg) { 110 case REG_PC: 111 #if defined(__aarch64__) 112 regs.elr = regvalue; 113 #elif defined(__amd64__) 114 regs.r_rip = regvalue; 115 #elif defined(__arm__) 116 regs.r_pc = regvalue; 117 #elif defined(__i386__) 118 regs.r_eip = regvalue; 119 #elif defined(__powerpc__) 120 regs.pc = regvalue; 121 #elif defined(__riscv) 122 regs.sepc = regvalue; 123 #endif 124 break; 125 case REG_SP: 126 #if defined(__aarch64__) 127 regs.sp = regvalue; 128 #elif defined(__amd64__) 129 regs.r_rsp = regvalue; 130 #elif defined(__arm__) 131 regs.r_sp = regvalue; 132 #elif defined(__i386__) 133 regs.r_esp = regvalue; 134 #elif defined(__powerpc__) 135 regs.fixreg[1] = regvalue; 136 #elif defined(__riscv) 137 regs.sp = regvalue; 138 #endif 139 break; 140 default: 141 DPRINTFX("ERROR: no support for reg number %d", reg); 142 return (-1); 143 } 144 if (ptrace(PT_SETREGS, proc_getpid(phdl), (caddr_t)®s, 0) < 0) 145 return (-1); 146 147 return (0); 148 } 149