1/*-
2 * SPDX-License-Identifier: BSD-2-Clause
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/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
42int
43proc_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(__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
94int
95proc_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)&regs, 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)&regs, 0) < 0)
142		return (-1);
143
144	return (0);
145}
146