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(__powerpc__) 70 *regvalue = regs.pc; 71 #elif defined(__riscv) 72 *regvalue = regs.sepc; 73 #endif 74 break; 75 case REG_SP: 76 #if defined(__aarch64__) 77 *regvalue = regs.sp; 78 #elif defined(__amd64__) 79 *regvalue = regs.r_rsp; 80 #elif defined(__arm__) 81 *regvalue = regs.r_sp; 82 #elif defined(__i386__) 83 *regvalue = regs.r_esp; 84 #elif defined(__powerpc__) 85 *regvalue = regs.fixreg[1]; 86 #elif defined(__riscv) 87 *regvalue = regs.sp; 88 #endif 89 break; 90 default: 91 DPRINTFX("ERROR: no support for reg number %d", reg); 92 return (-1); 93 } 94 95 return (0); 96 } 97 98 int 99 proc_regset(struct proc_handle *phdl, proc_reg_t reg, unsigned long regvalue) 100 { 101 struct reg regs; 102 103 if (phdl->status == PS_DEAD || phdl->status == PS_UNDEAD || 104 phdl->status == PS_IDLE) { 105 errno = ENOENT; 106 return (-1); 107 } 108 if (ptrace(PT_GETREGS, proc_getpid(phdl), (caddr_t)®s, 0) < 0) 109 return (-1); 110 switch (reg) { 111 case REG_PC: 112 #if defined(__aarch64__) 113 regs.elr = regvalue; 114 #elif defined(__amd64__) 115 regs.r_rip = regvalue; 116 #elif defined(__arm__) 117 regs.r_pc = regvalue; 118 #elif defined(__i386__) 119 regs.r_eip = regvalue; 120 #elif defined(__powerpc__) 121 regs.pc = regvalue; 122 #elif defined(__riscv) 123 regs.sepc = regvalue; 124 #endif 125 break; 126 case REG_SP: 127 #if defined(__aarch64__) 128 regs.sp = regvalue; 129 #elif defined(__amd64__) 130 regs.r_rsp = regvalue; 131 #elif defined(__arm__) 132 regs.r_sp = regvalue; 133 #elif defined(__i386__) 134 regs.r_esp = regvalue; 135 #elif defined(__powerpc__) 136 regs.fixreg[1] = regvalue; 137 #elif defined(__riscv) 138 regs.sp = regvalue; 139 #endif 140 break; 141 default: 142 DPRINTFX("ERROR: no support for reg number %d", reg); 143 return (-1); 144 } 145 if (ptrace(PT_SETREGS, proc_getpid(phdl), (caddr_t)®s, 0) < 0) 146 return (-1); 147 148 return (0); 149 } 150