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("$FreeBSD$"); 32 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(__mips__) 67 *regvalue = regs.r_regs[PC]; 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(__mips__) 84 *regvalue = regs.r_regs[SP]; 85 #elif defined(__powerpc__) 86 *regvalue = regs.fixreg[1]; 87 #elif defined(__riscv) 88 *regvalue = regs.sp; 89 #endif 90 break; 91 default: 92 DPRINTFX("ERROR: no support for reg number %d", reg); 93 return (-1); 94 } 95 96 return (0); 97 } 98 99 int 100 proc_regset(struct proc_handle *phdl, proc_reg_t reg, unsigned long regvalue) 101 { 102 struct reg regs; 103 104 if (phdl->status == PS_DEAD || phdl->status == PS_UNDEAD || 105 phdl->status == PS_IDLE) { 106 errno = ENOENT; 107 return (-1); 108 } 109 if (ptrace(PT_GETREGS, proc_getpid(phdl), (caddr_t)®s, 0) < 0) 110 return (-1); 111 switch (reg) { 112 case REG_PC: 113 #if defined(__aarch64__) 114 regs.elr = regvalue; 115 #elif defined(__amd64__) 116 regs.r_rip = regvalue; 117 #elif defined(__arm__) 118 regs.r_pc = regvalue; 119 #elif defined(__i386__) 120 regs.r_eip = regvalue; 121 #elif defined(__mips__) 122 regs.r_regs[PC] = regvalue; 123 #elif defined(__powerpc__) 124 regs.pc = regvalue; 125 #elif defined(__riscv) 126 regs.sepc = regvalue; 127 #endif 128 break; 129 case REG_SP: 130 #if defined(__aarch64__) 131 regs.sp = regvalue; 132 #elif defined(__amd64__) 133 regs.r_rsp = regvalue; 134 #elif defined(__arm__) 135 regs.r_sp = regvalue; 136 #elif defined(__i386__) 137 regs.r_esp = regvalue; 138 #elif defined(__mips__) 139 regs.r_regs[PC] = regvalue; 140 #elif defined(__powerpc__) 141 regs.fixreg[1] = regvalue; 142 #elif defined(__riscv) 143 regs.sp = regvalue; 144 #endif 145 break; 146 default: 147 DPRINTFX("ERROR: no support for reg number %d", reg); 148 return (-1); 149 } 150 if (ptrace(PT_SETREGS, proc_getpid(phdl), (caddr_t)®s, 0) < 0) 151 return (-1); 152 153 return (0); 154 } 155