1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD 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 #define _WANT_MIPS_REGNUM 37 #include <sys/ptrace.h> 38 39 #include <err.h> 40 #include <stdio.h> 41 #include <string.h> 42 #include <errno.h> 43 44 #include "_libproc.h" 45 46 int 47 proc_regget(struct proc_handle *phdl, proc_reg_t reg, unsigned long *regvalue) 48 { 49 struct reg regs; 50 51 if (phdl->status == PS_DEAD || phdl->status == PS_UNDEAD || 52 phdl->status == PS_IDLE) { 53 errno = ENOENT; 54 return (-1); 55 } 56 memset(®s, 0, sizeof(regs)); 57 if (ptrace(PT_GETREGS, proc_getpid(phdl), (caddr_t)®s, 0) < 0) 58 return (-1); 59 switch (reg) { 60 case REG_PC: 61 #if defined(__aarch64__) 62 *regvalue = regs.elr; 63 #elif defined(__amd64__) 64 *regvalue = regs.r_rip; 65 #elif defined(__arm__) 66 *regvalue = regs.r_pc; 67 #elif defined(__i386__) 68 *regvalue = regs.r_eip; 69 #elif defined(__mips__) 70 *regvalue = regs.r_regs[PC]; 71 #elif defined(__powerpc__) 72 *regvalue = regs.pc; 73 #elif defined(__riscv) 74 *regvalue = regs.sepc; 75 #endif 76 break; 77 case REG_SP: 78 #if defined(__aarch64__) 79 *regvalue = regs.sp; 80 #elif defined(__amd64__) 81 *regvalue = regs.r_rsp; 82 #elif defined(__arm__) 83 *regvalue = regs.r_sp; 84 #elif defined(__i386__) 85 *regvalue = regs.r_esp; 86 #elif defined(__mips__) 87 *regvalue = regs.r_regs[SP]; 88 #elif defined(__powerpc__) 89 *regvalue = regs.fixreg[1]; 90 #elif defined(__riscv) 91 *regvalue = regs.sp; 92 #endif 93 break; 94 default: 95 DPRINTFX("ERROR: no support for reg number %d", reg); 96 return (-1); 97 } 98 99 return (0); 100 } 101 102 int 103 proc_regset(struct proc_handle *phdl, proc_reg_t reg, unsigned long regvalue) 104 { 105 struct reg regs; 106 107 if (phdl->status == PS_DEAD || phdl->status == PS_UNDEAD || 108 phdl->status == PS_IDLE) { 109 errno = ENOENT; 110 return (-1); 111 } 112 if (ptrace(PT_GETREGS, proc_getpid(phdl), (caddr_t)®s, 0) < 0) 113 return (-1); 114 switch (reg) { 115 case REG_PC: 116 #if defined(__aarch64__) 117 regs.elr = regvalue; 118 #elif defined(__amd64__) 119 regs.r_rip = regvalue; 120 #elif defined(__arm__) 121 regs.r_pc = regvalue; 122 #elif defined(__i386__) 123 regs.r_eip = regvalue; 124 #elif defined(__mips__) 125 regs.r_regs[PC] = regvalue; 126 #elif defined(__powerpc__) 127 regs.pc = regvalue; 128 #elif defined(__riscv) 129 regs.sepc = regvalue; 130 #endif 131 break; 132 case REG_SP: 133 #if defined(__aarch64__) 134 regs.sp = regvalue; 135 #elif defined(__amd64__) 136 regs.r_rsp = regvalue; 137 #elif defined(__arm__) 138 regs.r_sp = regvalue; 139 #elif defined(__i386__) 140 regs.r_esp = regvalue; 141 #elif defined(__mips__) 142 regs.r_regs[SP] = regvalue; 143 #elif defined(__powerpc__) 144 regs.fixreg[1] = regvalue; 145 #elif defined(__riscv) 146 regs.sp = regvalue; 147 #endif 148 break; 149 default: 150 DPRINTFX("ERROR: no support for reg number %d", reg); 151 return (-1); 152 } 153 if (ptrace(PT_SETREGS, proc_getpid(phdl), (caddr_t)®s, 0) < 0) 154 return (-1); 155 156 return (0); 157 } 158