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__FBSDID("$FreeBSD: stable/11/lib/libproc/proc_regs.c 351792 2019-09-03 20:19:43Z kevans $"); 32 33#include <sys/types.h> 34#define _WANT_MIPS_REGNUM 35#include <sys/ptrace.h> 36 37#include <err.h> 38#include <stdio.h> 39#include <string.h> 40#include <errno.h> 41 42#include "_libproc.h" 43 44int 45proc_regget(struct proc_handle *phdl, proc_reg_t reg, unsigned long *regvalue) 46{ 47 struct reg regs; 48 49 if (phdl->status == PS_DEAD || phdl->status == PS_UNDEAD || 50 phdl->status == PS_IDLE) { 51 errno = ENOENT; 52 return (-1); 53 } 54 memset(®s, 0, sizeof(regs)); 55 if (ptrace(PT_GETREGS, proc_getpid(phdl), (caddr_t)®s, 0) < 0) 56 return (-1); 57 switch (reg) { 58 case REG_PC: 59#if defined(__aarch64__) 60 *regvalue = regs.elr; 61#elif defined(__amd64__) 62 *regvalue = regs.r_rip; 63#elif defined(__arm__) 64 *regvalue = regs.r_pc; 65#elif defined(__i386__) 66 *regvalue = regs.r_eip; 67#elif defined(__mips__) 68 *regvalue = regs.r_regs[PC]; 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(__mips__) 85 *regvalue = regs.r_regs[SP]; 86#elif defined(__powerpc__) 87 *regvalue = regs.fixreg[1]; 88#elif defined(__riscv__) 89 *regvalue = regs.sp; 90#endif 91 break; 92 default: 93 DPRINTFX("ERROR: no support for reg number %d", reg); 94 return (-1); 95 } 96 97 return (0); 98} 99 100int 101proc_regset(struct proc_handle *phdl, proc_reg_t reg, unsigned long regvalue) 102{ 103 struct reg regs; 104 105 if (phdl->status == PS_DEAD || phdl->status == PS_UNDEAD || 106 phdl->status == PS_IDLE) { 107 errno = ENOENT; 108 return (-1); 109 } 110 if (ptrace(PT_GETREGS, proc_getpid(phdl), (caddr_t)®s, 0) < 0) 111 return (-1); 112 switch (reg) { 113 case REG_PC: 114#if defined(__aarch64__) 115 regs.elr = regvalue; 116#elif defined(__amd64__) 117 regs.r_rip = regvalue; 118#elif defined(__arm__) 119 regs.r_pc = regvalue; 120#elif defined(__i386__) 121 regs.r_eip = regvalue; 122#elif defined(__mips__) 123 regs.r_regs[PC] = regvalue; 124#elif defined(__powerpc__) 125 regs.pc = regvalue; 126#elif defined(__riscv__) 127 regs.sepc = regvalue; 128#endif 129 break; 130 case REG_SP: 131#if defined(__aarch64__) 132 regs.sp = regvalue; 133#elif defined(__amd64__) 134 regs.r_rsp = regvalue; 135#elif defined(__arm__) 136 regs.r_sp = regvalue; 137#elif defined(__i386__) 138 regs.r_esp = regvalue; 139#elif defined(__mips__) 140 regs.r_regs[PC] = regvalue; 141#elif defined(__powerpc__) 142 regs.fixreg[1] = regvalue; 143#elif defined(__riscv__) 144 regs.sp = regvalue; 145#endif 146 break; 147 default: 148 DPRINTFX("ERROR: no support for reg number %d", reg); 149 return (-1); 150 } 151 if (ptrace(PT_SETREGS, proc_getpid(phdl), (caddr_t)®s, 0) < 0) 152 return (-1); 153 154 return (0); 155} 156