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 #include <sys/types.h> 34 #include <sys/ptrace.h> 35 36 #include <err.h> 37 #include <stdio.h> 38 #include <string.h> 39 #include <errno.h> 40 41 #include "_libproc.h" 42 43 int 44 proc_regget(struct proc_handle *phdl, proc_reg_t reg, unsigned long *regvalue) 45 { 46 struct reg regs; 47 48 if (phdl->status == PS_DEAD || phdl->status == PS_UNDEAD || 49 phdl->status == PS_IDLE) { 50 errno = ENOENT; 51 return (-1); 52 } 53 memset(®s, 0, sizeof(regs)); 54 if (ptrace(PT_GETREGS, proc_getpid(phdl), (caddr_t)®s, 0) < 0) 55 return (-1); 56 switch (reg) { 57 case REG_PC: 58 #if defined(__aarch64__) 59 *regvalue = regs.elr; 60 #elif defined(__amd64__) 61 *regvalue = regs.r_rip; 62 #elif defined(__arm__) 63 *regvalue = regs.r_pc; 64 #elif defined(__i386__) 65 *regvalue = regs.r_eip; 66 #elif defined(__powerpc__) 67 *regvalue = regs.pc; 68 #elif defined(__riscv) 69 *regvalue = regs.sepc; 70 #endif 71 break; 72 case REG_SP: 73 #if defined(__aarch64__) 74 *regvalue = regs.sp; 75 #elif defined(__amd64__) 76 *regvalue = regs.r_rsp; 77 #elif defined(__arm__) 78 *regvalue = regs.r_sp; 79 #elif defined(__i386__) 80 *regvalue = regs.r_esp; 81 #elif defined(__powerpc__) 82 *regvalue = regs.fixreg[1]; 83 #elif defined(__riscv) 84 *regvalue = regs.sp; 85 #endif 86 break; 87 default: 88 DPRINTFX("ERROR: no support for reg number %d", reg); 89 return (-1); 90 } 91 92 return (0); 93 } 94 95 int 96 proc_regset(struct proc_handle *phdl, proc_reg_t reg, unsigned long regvalue) 97 { 98 struct reg regs; 99 100 if (phdl->status == PS_DEAD || phdl->status == PS_UNDEAD || 101 phdl->status == PS_IDLE) { 102 errno = ENOENT; 103 return (-1); 104 } 105 if (ptrace(PT_GETREGS, proc_getpid(phdl), (caddr_t)®s, 0) < 0) 106 return (-1); 107 switch (reg) { 108 case REG_PC: 109 #if defined(__aarch64__) 110 regs.elr = regvalue; 111 #elif defined(__amd64__) 112 regs.r_rip = regvalue; 113 #elif defined(__arm__) 114 regs.r_pc = regvalue; 115 #elif defined(__i386__) 116 regs.r_eip = regvalue; 117 #elif defined(__powerpc__) 118 regs.pc = regvalue; 119 #elif defined(__riscv) 120 regs.sepc = regvalue; 121 #endif 122 break; 123 case REG_SP: 124 #if defined(__aarch64__) 125 regs.sp = regvalue; 126 #elif defined(__amd64__) 127 regs.r_rsp = regvalue; 128 #elif defined(__arm__) 129 regs.r_sp = regvalue; 130 #elif defined(__i386__) 131 regs.r_esp = regvalue; 132 #elif defined(__powerpc__) 133 regs.fixreg[1] = regvalue; 134 #elif defined(__riscv) 135 regs.sp = regvalue; 136 #endif 137 break; 138 default: 139 DPRINTFX("ERROR: no support for reg number %d", reg); 140 return (-1); 141 } 142 if (ptrace(PT_SETREGS, proc_getpid(phdl), (caddr_t)®s, 0) < 0) 143 return (-1); 144 145 return (0); 146 } 147