proc_regs.c revision 256281 
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: stable/10/lib/libproc/proc_regs.c 242723 2012-11-07 23:45:09Z jhibbits $");
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(__i386__)
60		*regvalue = regs.r_eip;
61#elif defined(__mips__)
62		*regvalue = regs.r_regs[PC];
63#elif defined(__powerpc__)
64		*regvalue = regs.pc;
65#endif
66		break;
67	case REG_SP:
68#if defined(__amd64__)
69		*regvalue = regs.r_rsp;
70#elif defined(__i386__)
71		*regvalue = regs.r_esp;
72#elif defined(__mips__)
73		*regvalue = regs.r_regs[SP];
74#elif defined(__powerpc__)
75		*regvalue = regs.fixreg[1];
76#endif
77		break;
78	default:
79		warn("ERROR: no support for reg number %d", reg);
80		return (-1);
81	}
82
83	return (0);
84}
85
86int
87proc_regset(struct proc_handle *phdl, proc_reg_t reg, unsigned long regvalue)
88{
89	struct reg regs;
90
91	if (phdl->status == PS_DEAD || phdl->status == PS_UNDEAD ||
92	    phdl->status == PS_IDLE) {
93		errno = ENOENT;
94		return (-1);
95	}
96	if (ptrace(PT_GETREGS, proc_getpid(phdl), (caddr_t)&regs, 0) < 0)
97		return (-1);
98	switch (reg) {
99	case REG_PC:
100#if defined(__amd64__)
101		regs.r_rip = regvalue;
102#elif defined(__i386__)
103		regs.r_eip = regvalue;
104#elif defined(__mips__)
105		regs.r_regs[PC] = regvalue;
106#elif defined(__powerpc__)
107		regs.pc = regvalue;
108#endif
109		break;
110	case REG_SP:
111#if defined(__amd64__)
112		regs.r_rsp = regvalue;
113#elif defined(__i386__)
114		regs.r_esp = regvalue;
115#elif defined(__mips__)
116		regs.r_regs[PC] = regvalue;
117#elif defined(__powerpc__)
118		regs.fixreg[1] = regvalue;
119#endif
120		break;
121	default:
122		warn("ERROR: no support for reg number %d", reg);
123		return (-1);
124	}
125	if (ptrace(PT_SETREGS, proc_getpid(phdl), (caddr_t)&regs, 0) < 0)
126		return (-1);
127
128	return (0);
129}
130