1 /*-
2 * SPDX-License-Identifier: BSD-2-Clause
3 *
4 * Copyright (c) 2010 The FreeBSD Foundation
5 *
6 * This software was developed by Rui Paulo under sponsorship from the
7 * FreeBSD Foundation.
8 *
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
11 * are met:
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in the
16 * documentation and/or other materials provided with the distribution.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
19 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
21 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
24 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
25 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
26 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
27 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
28 * SUCH DAMAGE.
29 */
30
31 #include <sys/cdefs.h>
32 #include <sys/types.h>
33 #include <sys/ptrace.h>
34
35 #include <err.h>
36 #include <stdio.h>
37 #include <string.h>
38 #include <errno.h>
39
40 #include "_libproc.h"
41
42 int
proc_regget(struct proc_handle * phdl,proc_reg_t reg,unsigned long * regvalue)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(®s, 0, sizeof(regs));
53 if (ptrace(PT_GETREGS, proc_getpid(phdl), (caddr_t)®s, 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(__powerpc__)
66 *regvalue = regs.pc;
67 #elif defined(__riscv)
68 *regvalue = regs.sepc;
69 #endif
70 break;
71 case REG_SP:
72 #if defined(__aarch64__)
73 *regvalue = regs.sp;
74 #elif defined(__amd64__)
75 *regvalue = regs.r_rsp;
76 #elif defined(__arm__)
77 *regvalue = regs.r_sp;
78 #elif defined(__i386__)
79 *regvalue = regs.r_esp;
80 #elif defined(__powerpc__)
81 *regvalue = regs.fixreg[1];
82 #elif defined(__riscv)
83 *regvalue = regs.sp;
84 #endif
85 break;
86 default:
87 DPRINTFX("ERROR: no support for reg number %d", reg);
88 return (-1);
89 }
90
91 return (0);
92 }
93
94 int
proc_regset(struct proc_handle * phdl,proc_reg_t reg,unsigned long regvalue)95 proc_regset(struct proc_handle *phdl, proc_reg_t reg, unsigned long regvalue)
96 {
97 struct reg regs;
98
99 if (phdl->status == PS_DEAD || phdl->status == PS_UNDEAD ||
100 phdl->status == PS_IDLE) {
101 errno = ENOENT;
102 return (-1);
103 }
104 if (ptrace(PT_GETREGS, proc_getpid(phdl), (caddr_t)®s, 0) < 0)
105 return (-1);
106 switch (reg) {
107 case REG_PC:
108 #if defined(__aarch64__)
109 regs.elr = regvalue;
110 #elif defined(__amd64__)
111 regs.r_rip = regvalue;
112 #elif defined(__arm__)
113 regs.r_pc = regvalue;
114 #elif defined(__i386__)
115 regs.r_eip = regvalue;
116 #elif defined(__powerpc__)
117 regs.pc = regvalue;
118 #elif defined(__riscv)
119 regs.sepc = regvalue;
120 #endif
121 break;
122 case REG_SP:
123 #if defined(__aarch64__)
124 regs.sp = regvalue;
125 #elif defined(__amd64__)
126 regs.r_rsp = regvalue;
127 #elif defined(__arm__)
128 regs.r_sp = regvalue;
129 #elif defined(__i386__)
130 regs.r_esp = regvalue;
131 #elif defined(__powerpc__)
132 regs.fixreg[1] = regvalue;
133 #elif defined(__riscv)
134 regs.sp = regvalue;
135 #endif
136 break;
137 default:
138 DPRINTFX("ERROR: no support for reg number %d", reg);
139 return (-1);
140 }
141 if (ptrace(PT_SETREGS, proc_getpid(phdl), (caddr_t)®s, 0) < 0)
142 return (-1);
143
144 return (0);
145 }
146