proc_regs.c revision 278529 
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: head/lib/libproc/proc_regs.c 278529 2015-02-10 19:41:30Z gnn $");
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
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(__amd64__)
58		*regvalue = regs.r_rip;
59#elif defined(__arm__)
60		*regvalue = regs.r_pc;
61#elif defined(__i386__)
62		*regvalue = regs.r_eip;
63#elif defined(__mips__)
64		*regvalue = regs.r_regs[PC];
65#elif defined(__powerpc__)
66		*regvalue = regs.pc;
67#endif
68		break;
69	case REG_SP:
70#if defined(__amd64__)
71		*regvalue = regs.r_rsp;
72#elif defined(__arm__)
73		*regvalue = regs.r_sp;
74#elif defined(__i386__)
75		*regvalue = regs.r_esp;
76#elif defined(__mips__)
77		*regvalue = regs.r_regs[SP];
78#elif defined(__powerpc__)
79		*regvalue = regs.fixreg[1];
80#endif
81		break;
82	default:
83		DPRINTFX("ERROR: no support for reg number %d", reg);
84		return (-1);
85	}
86
87	return (0);
88}
89
90int
91proc_regset(struct proc_handle *phdl, proc_reg_t reg, unsigned long regvalue)
92{
93	struct reg regs;
94
95	if (phdl->status == PS_DEAD || phdl->status == PS_UNDEAD ||
96	    phdl->status == PS_IDLE) {
97		errno = ENOENT;
98		return (-1);
99	}
100	if (ptrace(PT_GETREGS, proc_getpid(phdl), (caddr_t)&regs, 0) < 0)
101		return (-1);
102	switch (reg) {
103	case REG_PC:
104#if defined(__amd64__)
105		regs.r_rip = regvalue;
106#elif defined(__arm__)
107		regs.r_pc = regvalue;
108#elif defined(__i386__)
109		regs.r_eip = regvalue;
110#elif defined(__mips__)
111		regs.r_regs[PC] = regvalue;
112#elif defined(__powerpc__)
113		regs.pc = regvalue;
114#endif
115		break;
116	case REG_SP:
117#if defined(__amd64__)
118		regs.r_rsp = regvalue;
119#elif defined(__arm__)
120		regs.r_sp = regvalue;
121#elif defined(__i386__)
122		regs.r_esp = regvalue;
123#elif defined(__mips__)
124		regs.r_regs[PC] = regvalue;
125#elif defined(__powerpc__)
126		regs.fixreg[1] = regvalue;
127#endif
128		break;
129	default:
130		DPRINTFX("ERROR: no support for reg number %d", reg);
131		return (-1);
132	}
133	if (ptrace(PT_SETREGS, proc_getpid(phdl), (caddr_t)&regs, 0) < 0)
134		return (-1);
135
136	return (0);
137}
138