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 #ifdef __FBSDID
32 __FBSDID("$FreeBSD: head/lib/libproc/proc_regs.c 285003 2015-07-01 13:59:26Z br $");
33 #else
34 __RCSID("$NetBSD: proc_regs.c,v 1.4 2015/09/25 19:09:38 christos Exp $");
35 #endif
36
37 #include <sys/types.h>
38 #include <sys/ptrace.h>
39
40 #include <err.h>
41 #include <stdio.h>
42 #include <string.h>
43 #include <errno.h>
44 #include <sys/ucontext.h>
45 #include "_libproc.h"
46
47 int
proc_regget(struct proc_handle * phdl,proc_reg_t reg,unsigned long * regvalue)48 proc_regget(struct proc_handle *phdl, proc_reg_t reg, unsigned long *regvalue)
49 {
50 struct reg regs;
51
52 if (phdl->status == PS_DEAD || phdl->status == PS_UNDEAD ||
53 phdl->status == PS_IDLE) {
54 errno = ENOENT;
55 return (-1);
56 }
57 memset(®s, 0, sizeof(regs));
58 if (ptrace(PT_GETREGS, proc_getpid(phdl), ®s, 0) < 0)
59 return (-1);
60 switch (reg) {
61 case REG_PC:
62 #ifdef PTRACE_REG_PC
63 *regvalue = PTRACE_REG_PC(®s);
64 #else
65 # error "Add support for your architecture"
66 #endif
67 break;
68 case REG_SP:
69 #ifdef PTRACE_REG_SP
70 *regvalue = PTRACE_REG_SP(®s);
71 #else
72 # error "Add support for your architecture"
73 #endif
74 break;
75 default:
76 DPRINTFX("ERROR: no support for reg number %d", reg);
77 return (-1);
78 }
79
80 return (0);
81 }
82
83 int
proc_regset(struct proc_handle * phdl,proc_reg_t reg,unsigned long regvalue)84 proc_regset(struct proc_handle *phdl, proc_reg_t reg, unsigned long regvalue)
85 {
86 struct reg regs;
87
88 if (phdl->status == PS_DEAD || phdl->status == PS_UNDEAD ||
89 phdl->status == PS_IDLE) {
90 errno = ENOENT;
91 return (-1);
92 }
93 if (ptrace(PT_GETREGS, proc_getpid(phdl), ®s, 0) < 0)
94 return (-1);
95 switch (reg) {
96 case REG_PC:
97 #ifdef PTRACE_REG_SET_PC
98 PTRACE_REG_SET_PC(®s, regvalue);
99 #else
100 # error "Add support for your architecture"
101 #endif
102 break;
103 case REG_SP:
104 #ifdef PTRACE_REG_SP
105 PTRACE_REG_SP(®s) = regvalue;
106 #else
107 # error "Add support for your architecture"
108 #endif
109 break;
110 default:
111 DPRINTFX("ERROR: no support for reg number %d", reg);
112 return (-1);
113 }
114 if (ptrace(PT_SETREGS, proc_getpid(phdl), ®s, 0) < 0)
115 return (-1);
116
117 return (0);
118 }
119