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
proc_regget(struct proc_handle * phdl,proc_reg_t reg,unsigned long * regvalue)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
proc_regset(struct proc_handle * phdl,proc_reg_t reg,unsigned long regvalue)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