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
46int
47proc_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(&regs, 0, sizeof(regs));
57	if (ptrace(PT_GETREGS, proc_getpid(phdl), (caddr_t)&regs, 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
102int
103proc_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)&regs, 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[PC] = 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)&regs, 0) < 0)
154		return (-1);
155
156	return (0);
157}
158