lib/libproc/proc_regs.c

   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 #include "_libproc.h"
  41
  42 int
  43 proc_regget(struct proc_handle *phdl, proc_reg_t reg, unsigned long *regvalue)
  44 {
  45         struct reg regs;
  46
  47         if (phdl->status == PS_DEAD || phdl->status == PS_UNDEAD ||
  48             phdl->status == PS_IDLE) {
  49                 errno = ENOENT;
  50                 return (-1);
  51         }
  52         memset(&regs, 0, sizeof(regs));
  53         if (ptrace(PT_GETREGS, proc_getpid(phdl), (caddr_t)&regs, 0) < 0)
  54                 return (-1);
  55         switch (reg) {
  56         case REG_PC:
  57 #if defined(__aarch64__)
  58                 *regvalue = regs.elr;
  59 #elif defined(__amd64__)
  60                 *regvalue = regs.r_rip;
  61 #elif defined(__arm__)
  62                 *regvalue = regs.r_pc;
  63 #elif defined(__i386__)
  64                 *regvalue = regs.r_eip;
  65 #elif defined(__mips__)
  66                 *regvalue = regs.r_regs[PC];
  67 #elif defined(__powerpc__)
  68                 *regvalue = regs.pc;
  69 #elif defined(__riscv__)
  70                 *regvalue = regs.sepc;
  71 #endif
  72                 break;
  73         case REG_SP:
  74 #if defined(__aarch64__)
  75                 *regvalue = regs.sp;
  76 #elif defined(__amd64__)
  77                 *regvalue = regs.r_rsp;
  78 #elif defined(__arm__)
  79                 *regvalue = regs.r_sp;
  80 #elif defined(__i386__)
  81                 *regvalue = regs.r_esp;
  82 #elif defined(__mips__)
  83                 *regvalue = regs.r_regs[SP];
  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)&regs, 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(__mips__)
 121                 regs.r_regs[PC] = regvalue;
 122 #elif defined(__powerpc__)
 123                 regs.pc = regvalue;
 124 #elif defined(__riscv__)
 125                 regs.sepc = regvalue;
 126 #endif
 127                 break;
 128         case REG_SP:
 129 #if defined(__aarch64__)
 130                 regs.sp = regvalue;
 131 #elif defined(__amd64__)
 132                 regs.r_rsp = regvalue;
 133 #elif defined(__arm__)
 134                 regs.r_sp = regvalue;
 135 #elif defined(__i386__)
 136                 regs.r_esp = regvalue;
 137 #elif defined(__mips__)
 138                 regs.r_regs[PC] = regvalue;
 139 #elif defined(__powerpc__)
 140                 regs.fixreg[1] = regvalue;
 141 #elif defined(__riscv__)
 142                 regs.sp = regvalue;
 143 #endif
 144                 break;
 145         default:
 146                 DPRINTFX("ERROR: no support for reg number %d", reg);
 147                 return (-1);
 148         }
 149         if (ptrace(PT_SETREGS, proc_getpid(phdl), (caddr_t)&regs, 0) < 0)
 150                 return (-1);
 151
 152         return (0);
 153 }